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CN111799076B - A vacuum on-load tap changer single resistance alternating transition circuit and voltage regulation method - Google Patents

A vacuum on-load tap changer single resistance alternating transition circuit and voltage regulation method Download PDF

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Publication number
CN111799076B
CN111799076B CN202010592246.8A CN202010592246A CN111799076B CN 111799076 B CN111799076 B CN 111799076B CN 202010592246 A CN202010592246 A CN 202010592246A CN 111799076 B CN111799076 B CN 111799076B
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China
Prior art keywords
contact
vacuum contact
switch
main
auxiliary vacuum
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CN202010592246.8A
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CN111799076A (en
Inventor
赵鹏
李鹏
李金忠
张书琦
汪可
李戈琦
程涣超
孙建涛
刘雪丽
李刚
徐征宇
吴标
杨帆
王健一
遇心如
王琳
梁宁川
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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Priority to CN202010592246.8A priority Critical patent/CN111799076B/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0011—Voltage selector switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0016—Contact arrangements for tap changers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0038—Tap change devices making use of vacuum switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0066—Auxiliary contact devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)

Abstract

本发明公开了一种真空有载分接开关单电阻交替型过渡电路及调压方法，所述过渡电路包括：第一主触头MC1、第二主触头MC2、第一辅助真空触头V1、第二辅助真空触头V2、主真空触头V3、第一开关Z1、第二开关Z2和过渡电阻R；本发明设计了两条辅助真空触头支路，环流切断任务由两个辅助真空触头轮流担任，切换程序对称，使得两路过渡真空触头烧损完全一致，减轻了辅助真空触头的切换任务，相比目前“单主真空触头、单辅助真空触头”结构的过渡电路，分担了仅一只辅助真空触头的切换任务，能够平衡主真空触头和辅助真空触头的切换容量，提高整台真空有载分接开关的电气寿命。

The present invention discloses a single-resistance alternating transition circuit and a voltage regulation method for a vacuum on-load tap changer. The transition circuit comprises: a first main contact MC1, a second main contact MC2, a first auxiliary vacuum contact V1, a second auxiliary vacuum contact V2, a main vacuum contact V3, a first switch Z1, a second switch Z2 and a transition resistor R. The present invention designs two auxiliary vacuum contact branches, and the task of cutting off the circulating current is taken turns by the two auxiliary vacuum contacts. The switching procedure is symmetrical, so that the burning of the two transition vacuum contacts is completely consistent, which reduces the switching task of the auxiliary vacuum contact. Compared with the current transition circuit with a "single main vacuum contact and a single auxiliary vacuum contact" structure, the switching task of only one auxiliary vacuum contact is shared, the switching capacity of the main vacuum contact and the auxiliary vacuum contact can be balanced, and the electrical life of the entire vacuum on-load tap changer is improved.

Description

Single-resistor alternating transition circuit of vacuum on-load tap-changer and voltage regulating method
Technical Field
The invention relates to the technical field of transformers, in particular to a single-resistor alternating type transition circuit of a vacuum on-load tap-changer and a voltage regulating method.
Background
An on-load tap changer is a switching device for providing a constant voltage for a transformer when a load changes. The basic principle is that under the condition of ensuring no interruption of load current, the switching between taps in the winding of the transformer is realized, so that the number of turns of the winding, namely the voltage ratio of the transformer, is changed, and the purpose of regulating voltage is finally realized. Currently, on-load tap changers configured for rectifying, smelting and railway traction transformers are mostly fast in resistance switching and work by the principle that an arc contact system extinguishes an arc at a current zero crossing point. The switching principle is particularly suitable for tap changers with frequent transformer work switching, the contact burning loss is serious, the failure rate of the switch is high, and the carbonization speed of oil is high, so that the daily maintenance amount is increased for a power supply department. The vacuum on-load tap-changer mainly uses the vacuum tube of the change-over switch to realize arc extinction, the arc and the hot gas are not exposed, the oil in the oil chamber of the tap-changer can not be carbonized and polluted, the oil is not required to be purified, and the burning corrosion of the contact in the vacuum tube can be reduced to the minimum. The on-load tap-changer is mainly composed of a change-over switch, a change-over selector and an electric mechanism.
The on-load tap-changer is switched with load, and a transition circuit and a selection circuit are needed, and different voltage regulating circuits are needed for different voltage regulating modes, so that the circuit of the on-load tap-changer consists of the transition circuit, the selection circuit and the voltage regulating circuit. The transition circuit is a series resistor circuit connected across the tap points, and the corresponding mechanism is a change-over switch or a selection switch, which is a tap for changing the transformer winding in the electrified state. The tapping switch adopts the principle of a transition circuit to realize tapping conversion operation. The transition circuit has single resistance, double resistance, four resistance or multiple resistance according to the number of the transition circuit resistances, and has single fracture, double fracture and the like according to the contact fracture, and can be combined to form various transition circuits. The transition circuit and switching program have different effects on the contact duty of the switch, depending largely on the switching duty required, whether the arc can limit reliable extinction in the first half-cycle.
The arc contact without transition resistance is the main on-off contact which only bears the task of breaking load current, and the arc contact with transition resistance is the auxiliary contact which only bears the task of breaking internal circulation. According to the experience of extra-high voltage direct current engineering, the single-pole winding of the converter transformer load current is generally 500 ～ A, the internal circulation flowing through the transition resistor R is about 900 ～ A, and the internal circulation passing through the auxiliary vacuum contact is obviously larger than the load current, so that after multiple switching, the ablation degree of the main vacuum contact and the auxiliary vacuum contact can be different, and the switching burden and the electrical damage of the auxiliary vacuum contact can be more serious.
Accordingly, it is desirable to provide a transition circuit that reduces the auxiliary vacuum contact switching tasks and improves the electrical life of an on-load tap-changer.
Disclosure of Invention
The invention provides a single-resistor alternating transition circuit of a vacuum on-load tap-changer and a voltage regulating method, which are used for solving the problem of how to improve the electrical life of the vacuum on-load tap-changer.
In order to solve the above problems, according to one aspect of the present invention, there is provided a single-resistance alternating transition circuit of a vacuum on-load tap-changer, the transition circuit including a first main contact MC1, a second main contact MC2, a first auxiliary vacuum contact V1, a second auxiliary vacuum contact V2, a main vacuum contact V3, a first switch Z1, a second switch Z2, and a transition resistance R;
One end of the first main contact MC1 is connected with an odd tap gear of a voltage regulating winding of the transformer, one end of the second main contact MC2 is connected with an even tap gear of the voltage regulating winding of the transformer, one end of the first auxiliary vacuum contact V1 is connected with an odd tap gear of the voltage regulating winding of the transformer, the other end of the first auxiliary vacuum contact V1 is connected with one ends of the first switch Z1 and the second switch Z2 respectively, one end of the second auxiliary vacuum contact V2 is connected with an even tap gear of the voltage regulating winding of the transformer, the other end of the second auxiliary vacuum contact V2 is connected with one ends of the first switch Z1 and the second switch Z2 respectively, the other end of the first switch Z1 is connected with one end of the transition resistor R, the other end of the second switch Z1 is connected with one end of the main vacuum contact V3, and the other ends of the first main contact MC1, the second main contact MC2, the transition resistor R and the main vacuum contact V3 are all connected with neutral points of the transformer for outputting load current;
when the circulation cutting task is carried out, the first auxiliary vacuum contact V1 and the second auxiliary vacuum contact V2 are used for alternately switching, so that the switching task of the auxiliary vacuum contacts is lightened, and the electrical life of the on-load tap-changer is prolonged.
Preferably, when the first main contact MC1, the first auxiliary vacuum contact V1, the second auxiliary vacuum contact V2 and the main vacuum contact V3 are all in the on state, the first switch Z1 turns on the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, the second switch Z2 turns on the line where the first auxiliary vacuum contact V1 and the main vacuum contact V3 are located, and the second main contact MC2 is in the off state, the tap selector of the on-load tap switch is connected with the odd tap gear of the voltage regulating winding of the transformer, so that the load current can be output through the first main contact MC 1.
Preferably, when the second main contact MC2, the first auxiliary vacuum contact V1, the second auxiliary vacuum contact V2 and the main vacuum contact V3 are all in the on state, the first switch Z1 turns on the line where the second auxiliary vacuum contact V2 and the transition resistor R are located, the second switch Z2 turns on the line where the second auxiliary vacuum contact V2 and the main vacuum contact V3 are located, and the first main contact MC1 is in the off state, the tap selector of the on-load tap switch is connected with the even tap gear of the voltage regulating winding of the transformer, so that the load current can be output through the second main contact MC 2.
Preferably, the switching of the tap selector of the on-load tap changer from the odd tap gear to the even tap gear is realized by:
The first main contact MC1 is disconnected, and load current I N sequentially flows through the first auxiliary vacuum contact V1, the switch Z2 and the main vacuum contact V3 to be output;
The main vacuum contact V3 is disconnected to generate an electric arc, after the electric arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the second auxiliary vacuum contact V2 and the main vacuum contact V3 are positioned, and in the process, load current I N flows through the first auxiliary vacuum contact V1, the first switch Z1 and the transition resistor R in sequence to be output;
Closing the main vacuum contact V3, wherein the transition circuit forms bridging at the moment, and load current I N sequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 for output;
The first auxiliary vacuum contact V1 is disconnected to generate an electric arc, after the electric arc in the first auxiliary vacuum contact V1 is completely extinguished, the first switch Z1 is adjusted to disconnect a line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and in the process, load current I N flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 in sequence to be output;
Closing the first auxiliary vacuum contact V1, adjusting the first switch Z1 to conduct the line where the second auxiliary vacuum contact V2 and the transition resistor R are located, and outputting load current I N through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 in sequence in the process;
And closing the second main contact MC2 to enable the load current I N to flow through the second main contact MC2 for output, and ending tapping conversion operation to finish primary voltage regulation.
Preferably, the switching of the tap selector of the on-load tap changer from the even tap position to the odd tap position is realized by:
The second main contact MC2 is disconnected, and load current I N sequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 to be output;
The main vacuum contact V3 is disconnected to generate an electric arc, after the electric arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the first auxiliary vacuum contact V1 and the main vacuum contact V3 are positioned, and in the process, load current I N flows through the second auxiliary vacuum contact V2, the first switch Z1 and the transition resistor R in sequence to be output;
Closing the main vacuum contact V3, wherein the transition circuit forms bridging, and load current I N flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 to be output;
The second auxiliary vacuum contact V2 is disconnected to generate an electric arc, after the electric arc in the second auxiliary vacuum contact V2 is completely extinguished, the first switch Z1 is adjusted to disconnect a line where the second auxiliary vacuum contact V2 and the transition resistor R are located, and in the process, load current I N flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 in sequence to be output;
Closing the second auxiliary vacuum contact V2, adjusting the first switch Z1 to conduct the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and outputting load current I N sequentially flowing through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 in sequence in the process;
And closing the first main contact MC1 to enable the load current I N to flow through the first main contact MC1 for output, and ending tapping conversion operation to finish primary voltage regulation.
Preferably, the first switch Z1 is a mechanical single-contact switch or a change-over switch, and the second switch Z2 is a mechanical single-contact switch or a change-over switch.
According to another aspect of the present invention, there is provided a method of voltage regulation using a vacuum on-load tap-changer single-resistor alternating-type transition circuit as described above, the method comprising:
The first main contact MC1 is disconnected, and load current I N sequentially flows through the first auxiliary vacuum contact V1, the switch Z2 and the main vacuum contact V3 to be output;
The main vacuum contact V3 is disconnected to generate an electric arc, after the electric arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the second auxiliary vacuum contact V2 and the main vacuum contact V3 are positioned, and in the process, load current I N flows through the first auxiliary vacuum contact V1, the first switch Z1 and the transition resistor R in sequence to be output;
Closing the main vacuum contact V3, wherein the transition circuit forms bridging at the moment, and load current I N sequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 for output;
The first auxiliary vacuum contact V1 is disconnected to generate an electric arc, after the electric arc in the first auxiliary vacuum contact V1 is completely extinguished, the first switch Z1 is adjusted to disconnect a line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and in the process, load current I N flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 in sequence to be output;
Closing the first auxiliary vacuum contact V1, adjusting the first switch Z1 to conduct the line where the second auxiliary vacuum contact V2 and the transition resistor R are located, and outputting load current I N through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 in sequence in the process;
And closing the second main contact MC2 to enable the load current I N to flow through the second main contact MC2 for output, ending tapping conversion operation, and realizing that a tapping selector of the on-load tapping switch is converted from an odd tapping gear to an even tapping gear, so as to finish primary voltage regulation.
According to another aspect of the present invention, there is provided a method for voltage regulation using the single-resistor alternating transition circuit of a vacuum on-load tap-changer, the method comprising:
The second main contact MC2 is disconnected, and load current I N sequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 to be output;
The main vacuum contact V3 is disconnected to generate an electric arc, after the electric arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the first auxiliary vacuum contact V1 and the main vacuum contact V3 are positioned, and in the process, load current I N flows through the second auxiliary vacuum contact V2, the first switch Z1 and the transition resistor R in sequence to be output;
Closing the main vacuum contact V3, wherein the transition circuit forms bridging, and load current I N flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 to be output;
The second auxiliary vacuum contact V2 is disconnected to generate an electric arc, after the electric arc in the second auxiliary vacuum contact V2 is completely extinguished, the first switch Z1 is adjusted to disconnect a line where the second auxiliary vacuum contact V2 and the transition resistor R are located, and in the process, load current I N flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 in sequence to be output;
Closing the second auxiliary vacuum contact V2, adjusting the first switch Z1 to conduct the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and outputting load current I N sequentially flowing through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 in sequence in the process;
And closing the first main contact MC1 to enable the load current I N to flow through the first main contact MC1 for output, ending tapping conversion operation, and realizing that a tapping selector of the on-load tapping switch is converted from an even tapping gear to an odd tapping gear to finish primary voltage regulation.
The invention provides a single-resistor alternating type transition circuit of a vacuum on-load tap-changer and a voltage regulating method, which are characterized in that two auxiliary vacuum contact branches are designed, circulation cutting tasks are acted by the two auxiliary vacuum contacts in turn, and switching procedures are symmetrical, so that the burning losses of the two paths of transition vacuum contacts are completely consistent, the switching tasks of the auxiliary vacuum contacts are reduced, compared with the transition circuit of the existing single-main vacuum contact and single-auxiliary vacuum contact structure, the switching tasks of only one auxiliary vacuum contact are shared, the switching capacity of the main vacuum contact and the auxiliary vacuum contact can be balanced, and the electrical life of the whole vacuum on-load tap-changer is prolonged.
Drawings
Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:
FIG. 1 is a circuit diagram of a single-resistance alternating transition circuit 100 of a vacuum on-load tap-changer according to an embodiment of the invention;
FIG. 2 is a schematic diagram of transition circuit switching for a vacuum on-load tap-changer according to an embodiment of the invention;
FIG. 3 is a schematic diagram of transition circuit switching of a vacuum on-load tap-changer according to an embodiment of the invention;
FIG. 4 is a schematic diagram of transition circuit switching of a vacuum on-load tap-changer according to an embodiment of the invention;
FIG. 5 is a schematic diagram of transition circuit switching of a vacuum on-load tap-changer according to an embodiment of the invention;
FIG. 6 is a schematic diagram of transition circuit switching for a vacuum on-load tap-changer according to an embodiment of the invention;
FIG. 7 is a schematic diagram of transition circuit switching of a vacuum on-load tap-changer according to an embodiment of the invention;
FIG. 8 is a schematic diagram of transition circuit switching for a vacuum on-load tap-changer according to an embodiment of the invention;
FIG. 9 is a schematic diagram of transition circuit switching of a vacuum on-load tap-changer according to an embodiment of the invention;
FIG. 10 is a schematic diagram of transition circuit switching of a vacuum on-load tap-changer according to an embodiment of the invention;
FIG. 11 is a schematic diagram of transition circuit switching of a vacuum on-load tap-changer according to an embodiment of the invention;
FIG. 12 is a schematic diagram of a transition process of a vacuum on-load tap changer transition circuit from an odd tap gear to an even tap gear according to an embodiment of the invention;
FIG. 13 is a schematic diagram of a transition process of a transition circuit of a vacuum on-load tap changer from an even tap position to an odd tap position according to an embodiment of the invention;
FIG. 14 is a circuit diagram of another single resistance alternating transition circuit of a vacuum on-load tap-changer according to an embodiment of the invention;
FIG. 15 is a flow chart of a voltage regulation method 1500 for switching from an odd tap gear to an even tap gear using a vacuum on-load tap changer transition circuit in accordance with an embodiment of the invention;
Fig. 16 is a flowchart of a voltage regulation method 1600 for switching from even tap changing gear to odd tap changing gear using a vacuum on-load tap changer transition circuit in accordance with an embodiment of the invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a circuit diagram of a single-resistance alternating transition circuit 100 of a vacuum on-load tap-changer according to an embodiment of the invention. As shown in fig. 1, the single-resistor alternating transition circuit of the vacuum on-load tap-changer provided by the embodiment of the invention designs two auxiliary vacuum contact branches, and the circulation cutting-off task is acted by the two auxiliary vacuum contacts in turn, so that the switching procedures are symmetrical, the burning loss of the two paths of transition vacuum contacts is completely consistent, the switching task of the auxiliary vacuum contacts is lightened, and compared with the transition circuit of the single-main vacuum contact and the single-auxiliary vacuum contact structure at present, the switching task of only one auxiliary vacuum contact is shared, the switching capacity of the main vacuum contact and the auxiliary vacuum contact can be balanced, and the electrical life of the whole vacuum on-load tap-changer is prolonged. The single-resistance alternating transition circuit 100 of the vacuum on-load tap-changer provided by the embodiment of the invention comprises a first main contact MC1, a second main contact MC2, a first auxiliary vacuum contact V1, a second auxiliary vacuum contact V2, a main vacuum contact V3, a first switch Z1, a second switch Z2 and a transition resistor R, wherein one end of the first main contact MC1 is connected with an odd tap-changer gear of a voltage-regulating winding of a transformer, one end of the second main contact MC2 is connected with an even tap-changer gear of the voltage-regulating winding of the transformer, one end of the first auxiliary vacuum contact V1 is connected with an odd tap-changer gear of the voltage-regulating winding of the transformer, the other end of the first auxiliary vacuum contact V1 is connected with one end of the first switch Z1 and one end of the second switch Z2 respectively, one end of the second auxiliary vacuum contact V2 is connected with an even tap-changer gear of the voltage-regulating winding of the transformer respectively, the other end of the second auxiliary vacuum contact V2 is connected with one end of the first switch Z1 and one end of the second switch Z2 respectively, the other end of the first switch Z1 is connected with one end of the transition resistor R, the other end of the first switch MC1 is connected with one end of the second switch MC1 and the other end of the second switch MC2 alternately, and the first auxiliary vacuum contact is connected with the first auxiliary vacuum contact V2 and the other end of the first auxiliary vacuum contact is used for prolonging the service life of the load, and the load of the load is prolonged.
Preferably, when the first main contact MC1, the first auxiliary vacuum contact V1, the second auxiliary vacuum contact V2 and the main vacuum contact V3 are all in the on state, the first switch Z1 turns on the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, the second switch Z2 turns on the line where the first auxiliary vacuum contact V1 and the main vacuum contact V3 are located, and the second main contact MC2 is in the off state, the tap selector of the on-load tap switch is connected with the odd tap gear of the voltage regulating winding of the transformer, so that the load current can be output through the first main contact MC 1.
Preferably, when the second main contact MC2, the first auxiliary vacuum contact V1, the second auxiliary vacuum contact V2 and the main vacuum contact V3 are all in the on state, the first switch Z1 turns on the line where the second auxiliary vacuum contact V2 and the transition resistor R are located, the second switch Z2 turns on the line where the second auxiliary vacuum contact V2 and the main vacuum contact V3 are located, and the first main contact MC1 is in the off state, the tap selector of the on-load tap switch is connected with the even tap gear of the voltage regulating winding of the transformer, so that the load current can be output through the second main contact MC 2.
Preferably, the first switch Z1 is a mechanical single-contact switch or a change-over switch, and the second switch Z2 is a mechanical single-contact switch or a change-over switch.
In the embodiment of the invention, the first switch Z1 is a mechanical single-contact switch and comprises a first fixed contact 12, a second fixed contact 13 and a moving contact 11, wherein the first fixed contact 12 is connected with the odd tap shift through a first auxiliary vacuum contact V1, the second fixed contact 13 is connected with the even tap shift through a second auxiliary vacuum contact V2, one end of the moving contact 11 is connected with a transition resistor R, and the other end of the moving contact 11 is connected with the first fixed contact 12 and the second fixed contact 13 in a sliding manner. The second switch Z2 is a mechanical single-contact switch and comprises a first fixed contact 23, a second fixed contact 22 and a moving contact 21, wherein the first fixed contact 23 is connected with the odd tap position through a first auxiliary vacuum contact V1, the second fixed contact 22 is connected with the even tap position through a second auxiliary vacuum contact V2, one end of the moving contact 21 is connected with a main vacuum contact V3, and the other end of the moving contact 21 is connected with the first fixed contact 23 and the second fixed contact 22 in a sliding mode.
In the embodiment of the invention, when the tap selector of the on-load tap-changer is connected with the odd tap gears of the voltage regulating winding of the transformer, the first main contact MC1 is conducted, the second main contact MC2 is disconnected, the first auxiliary vacuum contact V1 is conducted, the second auxiliary vacuum contact V2 is conducted, the main vacuum contact V3 is conducted, the moving contact 11 of the first switch Z1 is connected with the first fixed contact 12 thereof, the moving contact 21 of the second switch Z2 is connected with the first fixed contact 23 thereof, and the load current is output through the main contact MC 1. When the tap selector of the on-load tap-changer is connected with an even tap-changing gear of the voltage-regulating winding of the transformer, the second main contact MC2 is conducted, the first main contact MC1 is disconnected, the first auxiliary vacuum contact V1 is conducted, the second auxiliary vacuum contact V2 is conducted, the main vacuum contact V3 is conducted, the moving contact 11 of the first switch Z1 is connected with the second fixed contact 13 thereof, the moving contact 21 of the second switch Z2 is connected with the second fixed contact 22 thereof, and the load current is output through the main contact MC 2.
Preferably, the switching of the tap selector of the on-load tap changer from the odd tap gear to the even tap gear is realized by:
The first main contact MC1 is disconnected, and load current I N sequentially flows through the first auxiliary vacuum contact V1, the switch Z2 and the main vacuum contact V3 to be output;
The main vacuum contact V3 is disconnected to generate an electric arc, after the electric arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the second auxiliary vacuum contact V2 and the main vacuum contact V3 are positioned, and in the process, load current I N flows through the first auxiliary vacuum contact V1, the first switch Z1 and the transition resistor R in sequence to be output;
Closing the main vacuum contact V3, wherein the transition circuit forms bridging at the moment, and load current I N sequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 for output;
The first auxiliary vacuum contact V1 is disconnected to generate an electric arc, after the electric arc in the first auxiliary vacuum contact V1 is completely extinguished, the first switch Z1 is adjusted to disconnect a line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and in the process, load current I N flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 in sequence to be output;
Closing the first auxiliary vacuum contact V1, adjusting the first switch Z1 to conduct the line where the second auxiliary vacuum contact V2 and the transition resistor R are located, and outputting load current I N through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 in sequence in the process;
And closing the second main contact MC2 to enable the load current I N to flow through the second main contact MC2 for output, and ending tapping conversion operation to finish primary voltage regulation.
In the embodiment of the invention, the position of the primary point of the switching selector of the tapping selector of the on-load tapping switch is not changed, and the gear number of the on-load tapping switch is consistent with the contact group number of the tapping selector, and the gear of the on-load tapping switch is required to be lifted from an odd gear N to an even gear N+1.
When the tap selector is connected with the odd tap gears of the voltage-regulating winding of the transformer, as shown in fig. 2, the main contact MC1 is turned on, the main contact MC2 is turned off, the vacuum contact V1 is turned on, the vacuum contact V2 is turned on, the vacuum contact V3 is turned on, the moving contact of the change-over switch Z1 is connected with the first fixed contact 12 thereof, the moving contact of the change-over switch Z2 is connected with the first fixed contact 23 thereof, and the load current is output through the main contact MC 1. When the tap selector is switched from the odd tap gear to the even tap, the specific operation method comprises the following steps:
(1) As shown in fig. 2, the main contact MC1 is closed, and the load current I N is output through the main contact MC 1;
(2) As shown in fig. 3, the main contact MC1 is opened, and the load current I N sequentially flows through the vacuum contact V1, the change-over switch Z2, and the vacuum contact V3 to be output;
(3) As shown in fig. 4, the vacuum contact V3 is opened to generate an arc, and after the arc is extinguished, a load current I N flows through the vacuum contact V1, the change-over switch Z1 and the transition resistor R in turn to output, and the recovery voltages U V3＝IN ×r at two ends of the vacuum contact V3;
(4) As shown in fig. 5, after the electric arc in the vacuum contact V3 is completely extinguished, the moving contact of the change-over switch Z2 rotates from being connected with the first fixed contact 23 to being connected with the second fixed contact 22, and the load current I N sequentially flows through the vacuum contact V1, the change-over switch Z1 and the transition resistor R to be output;
(5) As shown in fig. 6, the vacuum contact V3 is closed, and a transition circuit is bridged to generate a circulating current I C＝US/R, a load current I N flows through the vacuum contact V2, the change-over switch Z2 and the vacuum contact V3, and a current I V2＝IN+IC sequentially flows through the vacuum contact V2, the change-over switch Z2 and the vacuum contact V3, wherein the U S is an on-load tap-changer stage voltage;
(6) As shown in fig. 7, the vacuum contact V1 is disconnected to generate an arc, a load current I N sequentially flows through the vacuum contact V2, the change-over switch Z2 and the vacuum contact V3 to be output, and the recovery voltage at two ends of the vacuum contact V1 is U V1＝US;
(7) As shown in fig. 8, after the arc in the vacuum contact V1 is completely extinguished, the moving contact of the change-over switch Z1 is disconnected from the first fixed contact 12 thereof, and the load current I N sequentially flows through the vacuum contact V2, the change-over switch Z2 and the vacuum contact V3 for output;
(8) As shown in fig. 9, the vacuum contact V1 is closed, and the load current I N sequentially flows through the vacuum contact V2, the change-over switch Z2, and the vacuum contact V3 to be output;
(9) As shown in fig. 10, the moving contact of the change-over switch Z1 rotates to be connected with the second fixed contact 13, and the load current I N sequentially flows through the vacuum contact V2, the change-over switch Z2 and the vacuum contact V3 to be output;
(10) As shown in fig. 11, the main contact MC2 is closed, the load current I N flows through the main contact MC2 to be output, the tapping switching operation is ended, and the change-over switch completes the primary voltage regulation.
In the process of switching the tap selector from the odd tap gear to the even tap gear, the transition circuit switching procedure is shown in fig. 12.
Preferably, the switching of the tap selector of the on-load tap changer from the even tap position to the odd tap position is realized by:
The second main contact MC2 is disconnected, and load current I N sequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 to be output;
The main vacuum contact V3 is disconnected to generate an electric arc, after the electric arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the first auxiliary vacuum contact V1 and the main vacuum contact V3 are positioned, and in the process, load current I N flows through the second auxiliary vacuum contact V2, the first switch Z1 and the transition resistor R in sequence to be output;
Closing the main vacuum contact V3, wherein the transition circuit forms bridging, and load current I N flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 to be output;
The second auxiliary vacuum contact V2 is disconnected to generate an electric arc, after the electric arc in the second auxiliary vacuum contact V2 is completely extinguished, the first switch Z1 is adjusted to disconnect a line where the second auxiliary vacuum contact V2 and the transition resistor R are located, and in the process, load current I N flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 in sequence to be output;
Closing the second auxiliary vacuum contact V2, adjusting the first switch Z1 to conduct the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and outputting load current I N sequentially flowing through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 in sequence in the process;
And closing the first main contact MC1 to enable the load current I N to flow through the first main contact MC1 for output, and ending tapping conversion operation to finish primary voltage regulation.
In the embodiment of the present invention, when the tap selector of the on-load tap changer is connected to the even tap position of the voltage-regulating winding of the transformer, as shown in fig. 11, the second main contact MC2 is turned on, the first main contact MC1 is turned off, the first auxiliary vacuum contact V1 is turned on, the second auxiliary vacuum contact V2 is turned on, the main vacuum contact V3 is turned on, the moving contact 11 of the first switch Z1 is connected to the second fixed contact 13 thereof, the moving contact 21 of the second switch Z2 is connected to the second fixed contact 22 thereof, and the load current is output through the second main contact MC 2. When the tap selector is switched from the even tap gear to the odd tap, the specific operation method comprises the following steps:
(1) The second main contact MC2 is disconnected, and load current I N sequentially flows through the second auxiliary vacuum contact V2, the first switch Z2 and the main vacuum contact V3 to be output;
(2) After the arc is extinguished, load current I N flows through the second auxiliary vacuum contact V2, the first switch Z1 and the transition resistor R in sequence for outputting, and recovery voltage U V3＝IN xR at two ends of the main vacuum contact V3;
(3) After the electric arc in the main vacuum contact V3 is completely extinguished, the moving contact of the change-over switch Z2 rotates from being connected with the second fixed contact 22 to being connected with the first fixed contact 23, and load current I N sequentially flows through the second auxiliary vacuum contact V2, the second switch Z1 and the transition resistor R for output;
(4) The method comprises the steps of closing a main vacuum contact V3, bridging a transition circuit to generate circulating current I C＝US/R, enabling load current I N to flow through a first auxiliary vacuum contact V1, a second switch Z2 and the main vacuum contact V3, and enabling current I V1＝IN+IC to flow through the first auxiliary vacuum contact V1, the second switch Z2 and the main vacuum contact V3 in sequence, wherein U S is on-load tap-changer stage voltage;
(5) The second auxiliary vacuum contact V2 is disconnected to generate an electric arc, and a load current I N sequentially flows through the first auxiliary vacuum contact V1, the change-over switch Z2 and the vacuum contact V3 to be output, wherein the recovery voltage at two ends of the vacuum contact V2 is U V2＝US;
(6) After the electric arc in the second auxiliary vacuum contact V2 is completely extinguished, the moving contact of the first switch Z1 is disconnected with the second fixed contact 13, and the load current I N sequentially flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 for output;
(7) The second auxiliary vacuum contact V2 is closed, and the load current IN sequentially flows through the first auxiliary vacuum contact V1, the second switch Z2 and the main vacuum contact V3 for output;
(8) The moving contact 11 of the first change-over switch Z1 is adjusted to be connected with the first fixed contact 12 in a rotating way, and load current I N sequentially flows through the first auxiliary vacuum contact V1, the second switch Z2 and the main vacuum contact V3 to be output;
(9) The first main contact MC1 is closed, the load current I N flows through the first main contact MC1 to be output, the tapping conversion operation is finished, and the change-over switch completes primary voltage regulation.
In the process of switching the tap selector from the even tap gear to the odd tap gear, the transition circuit switching procedure is shown in fig. 13. Wherein,
In an embodiment of the present invention, the switching tasks of the on-load tap-changer transition circuit are shown in the following table:
Wherein I N is load current, us is on-load tap-changer stage voltage, and R is transition resistance.
Fig. 14 is a circuit diagram of another single resistance alternating transition circuit of a vacuum on-load tap-changer according to an embodiment of the invention. As shown in fig. 14, only the first switch and the second switch in fig. 1 are set as transfer switches, and other elements are the same as those in fig. 1, and functions and actions are the same as those of the transition circuit shown in fig. 1, and are not described herein.
Fig. 15 is a flowchart of a voltage regulation method 1500 for switching from an odd tap gear to an even tap gear using a vacuum on-load tap changer transition circuit in accordance with an embodiment of the invention. As shown in fig. 15, a method 1500 for voltage regulation using a single-resistor alternating transition circuit of a vacuum on-load tap-changer according to an embodiment of the present invention starts from step 1501, where the first main contact MC1 is disconnected in step 1501, and a load current I N is output through the first auxiliary vacuum contact V1, the switch Z2, and the main vacuum contact V3 in order.
In step 1502, the main vacuum contact V3 is disconnected to generate an arc, and after the arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the second auxiliary vacuum contact V2 and the main vacuum contact V3 are located, and in this process, the load current I N flows through the first auxiliary vacuum contact V1, the first switch Z1 and the transition resistor R in order to be output.
In step 1503, the main vacuum contact V3 is closed, at which time the transition circuit forms a bridge, and the load current I N flows through the second auxiliary vacuum contact V2, the second switch Z2, and the main vacuum contact V3 in order.
In step 1504, the first auxiliary vacuum contact V1 is opened to generate an arc, and after the arc in the first auxiliary vacuum contact V1 is completely extinguished, the first switch Z1 is adjusted to open a line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and in this process, the load current I N flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 in order to be output.
In step 1505, the first auxiliary vacuum contact V1 is closed, and the first switch Z1 is adjusted to conduct the line where the second auxiliary vacuum contact V2 and the transition resistor R are located, and in this process, the load current I N flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 in order to be output.
In step 1506, the second main contact MC2 is closed, so that the load current I N flows through the second main contact MC2 to be output, the tap change operation is ended, and the tap selector of the on-load tap changer is switched from the odd tap gear to the even tap gear, thereby completing the primary voltage regulation.
The voltage regulation method 1500 of the embodiment of the present invention for converting an odd tap gear to an even tap gear by using a transition circuit of a vacuum on-load tap switch corresponds to the single-resistor alternating transition circuit 100 of the vacuum on-load tap switch according to another embodiment of the present invention, and is not described herein.
Fig. 16 is a flowchart of a voltage regulation method 1600 for switching from even tap changing gear to odd tap changing gear using a vacuum on-load tap changer transition circuit in accordance with an embodiment of the invention. As shown in fig. 16, a method 1600 for voltage regulation by using a single-resistor alternating transition circuit of a vacuum on-load tap-changer provided by the embodiment of the invention starts from step 1601, the second main contact MC2 is disconnected in step 1601, and a load current I N flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 in sequence for output.
In step 1602, the main vacuum contact V3 is disconnected to generate an arc, and after the arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the first auxiliary vacuum contact V1 and the main vacuum contact V3 are located, and in this process, the load current I N flows through the second auxiliary vacuum contact V2, the first switch Z1 and the transition resistor R in order to be output.
At step 1603, the primary vacuum contact V3 is closed, at which point the transition circuit forms a bridge, and a load current I N flows through the first auxiliary vacuum contact V1, the second switch Z2, and the vacuum contact V3 output.
In step 1604, the second auxiliary vacuum contact V2 is opened to generate an arc, and after the arc in the second auxiliary vacuum contact V2 is completely extinguished, the first switch Z1 is adjusted to open a line where the second auxiliary vacuum contact V2 and the transition resistor R are located, and in this process, the load current I N flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 in order to be output.
In step 1605, the second auxiliary vacuum contact V2 is closed, and the first switch Z1 is adjusted to conduct the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and in this process, the load current I N flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 in sequence to be output.
In step 1606, the first main contact MC1 is closed, so that the load current I N flows through the first main contact MC1 to be output, the tap change operation is ended, and the tap selector for implementing the on-load tap switch implements the conversion from the even tap gear to the odd tap gear, thereby completing the primary voltage regulation.
The voltage regulation method 1600 of the embodiment of the present invention for converting an odd tap gear to an even tap gear by using a transition circuit of a vacuum on-load tap switch corresponds to the single-resistor alternating transition circuit 100 of the vacuum on-load tap switch according to another embodiment of the present invention, and is not described herein.
The invention has been described with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed invention are equally possible within the scope of the invention, as defined by the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a/an/the [ means, component, etc. ]" are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the specific embodiments of the present invention without departing from the spirit and scope of the present invention, and any modifications and equivalents are intended to be included in the scope of the claims of the present invention.

Claims (7)

1. The single-resistance alternating transition circuit of the vacuum on-load tap-changer is characterized by comprising a first main contact MC1, a second main contact MC2, a first auxiliary vacuum contact V1, a second auxiliary vacuum contact V2, a main vacuum contact V3, a first switch Z1, a second switch Z2 and a transition resistor R;
one end of the first main contact MC1 is connected with an odd tap gear of a voltage regulating winding of the transformer, one end of the second main contact MC2 is connected with an even tap gear of the voltage regulating winding of the transformer, one end of the first auxiliary vacuum contact V1 is connected with an odd tap gear of the voltage regulating winding of the transformer, the other end of the first auxiliary vacuum contact V1 is connected with one end of the first switch Z1 and one end of the second switch Z2 respectively, one end of the second auxiliary vacuum contact V2 is connected with an even tap gear of the voltage regulating winding of the transformer, the other end of the second auxiliary vacuum contact V2 is connected with one end of the first switch Z1 and one end of the second switch Z2 respectively, the other end of the second switch Z2 is connected with one end of the main vacuum contact V3, and the other ends of the first main contact MC1, the second main contact MC2, the transition resistor R and the main vacuum contact V3 are all connected with neutral points of the transformer for outputting load current;
When the circulation cutting task is carried out, the first auxiliary vacuum contact V1 and the second auxiliary vacuum contact V2 are used for alternately switching, so that the switching task of the auxiliary vacuum contacts is lightened, and the electrical life of the on-load tap-changer is prolonged;
The method for realizing the switching of the tap selector of the on-load tap changer from the odd tap gear to the even tap gear comprises the following steps:
The first main contact MC1 is disconnected, and load current I N sequentially flows through the first auxiliary vacuum contact V1, the switch Z2 and the main vacuum contact V3 to be output;
The main vacuum contact V3 is disconnected to generate an electric arc, after the electric arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the second auxiliary vacuum contact V2 and the main vacuum contact V3 are positioned, and in the process, load current I N flows through the first auxiliary vacuum contact V1, the first switch Z1 and the transition resistor R in sequence to be output;
Closing the main vacuum contact V3, wherein the transition circuit forms bridging at the moment, and load current I N sequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 for output;
The first auxiliary vacuum contact V1 is disconnected to generate an electric arc, after the electric arc in the first auxiliary vacuum contact V1 is completely extinguished, the first switch Z1 is adjusted to disconnect a line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and in the process, load current I N flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 in sequence to be output;
Closing the first auxiliary vacuum contact V1, adjusting the first switch Z1 to conduct the line where the second auxiliary vacuum contact V2 and the transition resistor R are located, and outputting load current I N through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 in sequence in the process;
closing the second main contact MC2 to enable a load current I N to flow through the second main contact MC2 for output, ending tapping conversion operation and completing primary voltage regulation;
wherein, the first switch Z1 is a mechanical single-contact switch or a change-over switch.
2. The transition circuit according to claim 1, wherein when the first main contact MC1, the first auxiliary vacuum contact V1, the second auxiliary vacuum contact V2 and the main vacuum contact V3 are all in a conductive state, the first switch Z1 conducts a line in which the first auxiliary vacuum contact V1 and the transition resistor R are located, the second switch Z2 conducts a line in which the first auxiliary vacuum contact V1 and the main vacuum contact V3 are located, the second main contact MC2 is in an off state, and a tap selector of the on-load tap switch is connected with an odd tap gear of the voltage regulating winding of the transformer, so that a load current can be output through the first main contact MC 1.
3. The transition circuit according to claim 1, wherein when the second main contact MC2, the first auxiliary vacuum contact V1, the second auxiliary vacuum contact V2 and the main vacuum contact V3 are all in the on state, the first switch Z1 turns on the line where the second auxiliary vacuum contact V2 and the transition resistor R are located, the second switch Z2 turns on the line where the second auxiliary vacuum contact V2 and the main vacuum contact V3 are located, the first main contact MC1 is in the off state, and the tap selector of the on-load tap switch is connected with the even tap position of the voltage regulating winding of the transformer, so that the load current can be output through the second main contact MC 2.
4. The transition circuit of claim 1, wherein the transition of the tap selector of the on-load tap changer from the even tap position to the odd tap position is accomplished by:
The second main contact MC2 is disconnected, and load current I N sequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 to be output;
The main vacuum contact V3 is disconnected to generate an electric arc, after the electric arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the first auxiliary vacuum contact V1 and the main vacuum contact V3 are positioned, and in the process, load current I N flows through the second auxiliary vacuum contact V2, the first switch Z1 and the transition resistor R in sequence to be output;
Closing the main vacuum contact V3, wherein the transition circuit forms bridging, and load current I N flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 to be output;
The second auxiliary vacuum contact V2 is disconnected to generate an electric arc, after the electric arc in the second auxiliary vacuum contact V2 is completely extinguished, the first switch Z1 is adjusted to disconnect a line where the second auxiliary vacuum contact V2 and the transition resistor R are located, and in the process, load current I N flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 in sequence to be output;
Closing the second auxiliary vacuum contact V2, adjusting the first switch Z1 to conduct the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and outputting load current I N sequentially flowing through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 in sequence in the process;
And closing the first main contact MC1 to enable the load current I N to flow through the first main contact MC1 for output, and ending tapping conversion operation to finish primary voltage regulation.
5. The transition circuit according to claim 1, wherein the second switch Z2 is a mechanical single contact switch or a transfer switch.
6. A method of voltage regulation using a vacuum on-load tap-changer single-resistor alternating transition circuit as claimed in any one of claims 1 to 5, the method comprising:
The first main contact MC1 is disconnected, and load current I N sequentially flows through the first auxiliary vacuum contact V1, the switch Z2 and the main vacuum contact V3 to be output;
The main vacuum contact V3 is disconnected to generate an electric arc, after the electric arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the second auxiliary vacuum contact V2 and the main vacuum contact V3 are positioned, and in the process, load current I N flows through the first auxiliary vacuum contact V1, the first switch Z1 and the transition resistor R in sequence to be output;
Closing the main vacuum contact V3, wherein the transition circuit forms bridging at the moment, and load current I N sequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 for output;
The first auxiliary vacuum contact V1 is disconnected to generate an electric arc, after the electric arc in the first auxiliary vacuum contact V1 is completely extinguished, the first switch Z1 is adjusted to disconnect a line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and in the process, load current I N flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 in sequence to be output;
Closing the first auxiliary vacuum contact V1, adjusting the first switch Z1 to conduct the line where the second auxiliary vacuum contact V2 and the transition resistor R are located, and outputting load current I N through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 in sequence in the process;
And closing the second main contact MC2 to enable the load current I N to flow through the second main contact MC2 for output, ending tapping conversion operation, and realizing that a tapping selector of the on-load tapping switch is converted from an odd tapping gear to an even tapping gear, so as to finish primary voltage regulation.
7. A method of voltage regulation using a single-pole single-resistor alternating transition circuit of a vacuum on-load tap-changer as claimed in any one of claims 1-5, the method comprising:
The second main contact MC2 is disconnected, and load current I N sequentially flows through the second auxiliary vacuum contact V2, the second switch Z2 and the main vacuum contact V3 to be output;
The main vacuum contact V3 is disconnected to generate an electric arc, after the electric arc in the main vacuum contact V3 is completely extinguished, the second switch Z2 is adjusted to conduct the line where the first auxiliary vacuum contact V1 and the main vacuum contact V3 are positioned, and in the process, load current I N flows through the second auxiliary vacuum contact V2, the first switch Z1 and the transition resistor R in sequence to be output;
Closing the main vacuum contact V3, wherein the transition circuit forms bridging, and load current I N flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 to be output;
The second auxiliary vacuum contact V2 is disconnected to generate an electric arc, after the electric arc in the second auxiliary vacuum contact V2 is completely extinguished, the first switch Z1 is adjusted to disconnect a line where the second auxiliary vacuum contact V2 and the transition resistor R are located, and in the process, load current I N flows through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 in sequence to be output;
Closing the second auxiliary vacuum contact V2, adjusting the first switch Z1 to conduct the line where the first auxiliary vacuum contact V1 and the transition resistor R are located, and outputting load current I N sequentially flowing through the first auxiliary vacuum contact V1, the second switch Z2 and the vacuum contact V3 in sequence in the process;
And closing the first main contact MC1 to enable the load current I N to flow through the first main contact MC1 for output, ending tapping conversion operation, and realizing that a tapping selector of the on-load tapping switch is converted from an even tapping gear to an odd tapping gear to finish primary voltage regulation.
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