KR20100006560U - Portable transformer for one phase equipped with on load switch - Google Patents

Abstract

 Disclosed is a mobile single-phase transformer device having a high-voltage single-phase load switch capable of temporary transmission in case of failure of an uninterrupted replacement and burnout of a columnar transformer installed on a pole of a high-voltage overhead distribution line. According to the present invention, it is possible to check whether the parallel operation is possible by detecting the potential difference between the single-phase transformer and the column transformer, the inspection apparatus for checking the coincidence of the parallel operation conditions including the detection of abnormal conditions of overload and fault current, and the high voltage supplied from the overhead distribution line. A load switch for opening and closing the flow of the electronic device and an electronic switch for automatically cutting off the current flow according to the state inspected by the inspection device, and converting the high pressure supplied through the load switch into low pressure, thereby converting the converted low pressure. A mobile single phase transformer device including a single phase (1Φ) transformer, which is transmitted to the low voltage line of the overhead distribution line via the electromagnetic switch, is provided.

Single phase transformer, uninterrupted construction, load switchgear, column transformer, inspection device, parallel operation

Description

PORTABLE TRANSFORMER FOR ONE PHASE EQUIPPED WITH ON LOAD SWITCH}

The present invention relates to a mobile single-phase transformer, and more particularly, to a mobile single-phase transformer device with a built-in high-voltage single-phase load switch capable of temporary transmission in the event of failure, such as uninterrupted replacement and burnout of the columnar transformer installed on the pole of the high-voltage overhead distribution line It is about.

In the uninterrupted transformers currently used, the old transformers under overload use three-phase switchgear and three-phase uninterruptible transformer devices, which are already developed and distributed.However, in the case of single-phase supply from distribution lines, one column transformer is used. In the case of 3-phase (3Φ) supply, three single-phase (1Φ) columnar transformers are connected by wire (Y) to supply three-phase, so the existing three-phase construction switch and three-phase (3Φ) uninterruptible transformer 1Φ) Replacing columnar transformers with uninterruptible power is not a suitable method and device. An example of this is described in FIG. 1.

1 is a configuration diagram showing a conventional transformer unit 100 for an uninterruptible construction, for explaining a method of replacing the columnar transformer 120 installed between a high voltage line and a low voltage line to an uninterruptible power.

As shown in FIG. 1, conventionally, for an uninterruptible construction comprising a high voltage switch 114, a mobile transformer 112, a transformer protection fuse 113, a inspection device 111, and a low voltage switch 115 between a high voltage line and a low voltage line. By installing the transformer device 110 in parallel, between the high voltage line and the low voltage line to operate the columnar transformer 120 and the uninterrupted electric transformer device 110 in a parallel operation state. Accordingly, the electric power customer is supplied with electricity from two places, the pole transformer 120 of the power company and the transformer device 110 for uninterrupted construction.

In this case, when the transformer secondary lowering line 130 is connected to the columnar transformer 120 to be replaced, the power consumer supplies power through the mobile transformer 110 without a momentary power failure. After opening the COS (Cut Out Switch) connected to the columnar transformer 120 to be replaced with the high voltage line, the columnar transformer 120 can be freely replaced in a completely separated state from the high voltage line and the low voltage line.

Subsequently, when the columnar transformer 120 is replaced, the COS 140 connected to the high voltage line of the replaced columnar transformer 120 is inputted, and the secondary side lowering line 130 of the newly replaced columnar transformer 120 is connected to the low voltage line. When connected to, the mobile transformer 110 and the columnar transformer 120 is in a parallel operation state again. Therefore, the power consumer will be able to supply power from both the mobile transformer 110 and columnar transformer 120.

Thereafter, when the uninterruptible transformer device 110 is separated from the high voltage line and the low voltage line, the power receiver is supplied with power only to the newly replaced columnar transformer 120 as described above, and thus, the power receiver is replaced during the replacement period of the columnar transformer 120. Can be powered continuously without a momentary power outage.

However, the uninterruptible construction transformer device 110 used herein are all three-phase supply transformer, and the three-phase construction switch in addition to the three-phase supply transformer is large in size, excessive in weight, poor in maneuverability, workability and economy, Field adaptability was also a problem. Therefore, the pole-phase transformer 120 mainly used here has a problem that can not be replaced by an uninterruptible operation after supplying power when replacing due to failure due to single-phase or three-phase three-phase transformer, such as burnout.

In addition, since the parallel driving inspection apparatus 111 does not have the automatic closing prevention and auto shut-off function of the low-voltage switch 115 after the inspection, the situation is required that a protection device that can cope with this.

The present invention was devised to solve the conventional problems as described above. Instead of the existing three-phase switchgear and the three-phase uninterruptible transformer, the miniaturization, light weight and It is an object of the present invention to provide a single-phase transformer with a built-in high-voltage single-phase load switch that ensures maneuverability.

In addition, the present invention is to provide a single-phase transformer with a built-in high-voltage single-phase load switch to reduce the time in the event of a power failure by quickly performing an uninterrupted replacement operation with a time margin regardless of power failure after temporary power supply in the field The purpose.

In addition, the present invention is connected to the inspection device and the open / close control device only when the parallel operating conditions are established (ON), and to increase the safety to prevent the power failure accident due to the automatic shutdown (OFF) function and malfunction of the inspection device, It is yet another object to provide a single phase transformer with a built-in high voltage single phase load switch.

In order to achieve the object of the present invention as described above, and to perform the characteristic functions of the present invention to be described later, the characteristic configuration of the present invention is as follows.

According to one aspect of the present invention, a mobile single-phase transformer device for uninterrupted replacement of the pole transformer and temporary transmission in the event of failure, detecting whether the parallel operation is possible by detecting the potential difference between the single phase transformer and the pole transformer and detecting an abnormal state of overload and fault current. A inspection device for inspecting the coincidence state of parallel operation conditions including a load, a load switch for opening and closing the flow of high pressure supplied from the overhead distribution line, and an electronic switch for automatically cutting off the current flow according to the state inspected in the inspection device. And a single phase (1Φ) transformer for converting the high pressure supplied through the load switch to low pressure, and transmitting the converted low pressure to the low voltage line of the overhead distribution line via the electronic switch. Is provided.

Here, the single-phase transformer is connected to the overhead distribution line, a high-voltage cable connecting portion receiving a high pressure, a load switch unit for opening and closing the flow of the high pressure, a low voltage output unit for converting the high pressure supplied from the load switch to low pressure, The electronic switchgear which receives the low voltage power from the low voltage output unit and detects the state of overload or fault current automatically during parallel operation, and the overhead distribution line connected to the low voltage power supplied from the electronic switch via a neighboring inspection device. It is provided with a low voltage cable connection to transmit to the low voltage line.

In addition, the inspection apparatus includes a single-phase transformer voltmeter for detecting the voltage on the RT on the single-phase transformer side, a column-phase transformer voltmeter for detecting the voltage on the RT on the column-phase transformer, and R and T phases between the single-phase transformer and the column-phase transformer. When the potential difference is detected and the R / T inspection detector for determining whether the phase angles coincide with each other, and when the parallel operation condition is not satisfied because the phase angles are different in the R / T inspection detector, the corresponding first voltage is generated. A protective relay operated according to the first voltage and determining an abnormal state such as an overload or a fixed current, and an auxiliary relay operated according to the first voltage to suppress the operation of the electronic switch.

In addition, the R / T inspection detector provides for operating when the detected potential difference is 30V or more to detect and operate a first voltage corresponding to the potential difference.

In addition, the protection relay, when the R / T inspection detection system malfunctions due to the abnormal voltage of the overhead distribution line system during parallel operation, a malfunction prevention timer that detects the signal according to the malfunction and informs the protection relay whether or not it is malfunctioning. It is provided further including.

According to the present invention, by providing a single-phase transformer with a high-voltage single-phase load switch of miniaturization and lightening that the existing uninterruptible construction transformer has been enlarged and weighted, the effect of replacing and restoring the pole transformer is achieved simply, quickly and safely. .

In addition, by providing a single-phase transformer with a high-voltage single-phase load switch that is highly adaptable to the field and can temporarily supply power to a power failure customer in the event of a transformer burnout. In addition, it is possible to minimize the inconvenience and economic loss of power consumers due to long power outages, reduce construction costs, and greatly reduce the burden of purchasing equipment for electric construction companies.

DETAILED DESCRIPTION The following detailed description of the present invention refers to the accompanying drawings that show, by way of illustration, specific embodiments in which the present invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the present invention with respect to one embodiment. In addition, it is to be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the present invention. Accordingly, the following detailed description is not to be taken in a limiting sense, and the scope of the present invention, if properly described, is defined only by the appended claims, along with the full range of equivalents to which such claims are entitled. Like reference numerals in the drawings refer to the same or similar functions throughout the several aspects.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

Full configuration example

2 is a configuration diagram illustrating a relationship between an uninterruptible single phase transformer device and a column transformer according to an embodiment of the present invention.

 As shown in FIG. 2, the single phase transformer device 200A for uninterruptible construction according to an embodiment of the present invention is a mobile transformer device used during uninterruptible construction to enable temporary transmission in case of uninterruptible replacement of a pole transformer. The single phase (1Φ) transformer 210 and the inspection apparatus 220 are comprised between the high pressure overhead distribution line and the low pressure overhead distribution line.

The single phase (1Φ) transformer 210 of the present invention is provided with a state of inspection as a result of the inspection of the load switch (not shown) for opening and closing the flow of high pressure supplied from the overhead distribution line and the inspection apparatus 220 to be described later. And an electronic switch (not shown) which automatically cuts off the electronic current according to the state of examination. Accordingly, the single phase transformer 210 converts the high pressure supplied through the built-in load switch to low pressure, and transfers the converted low pressure to the low voltage line of the overhead distribution line through the electronic switch.

The inspection apparatus 220 of the present invention detects the potential difference between the single-phase transformer 210 and the columnar transformer 220B, determines whether the parallel operation is possible by detecting the potential difference, and detects an abnormal state of the overload and fault current in the transformer. It detects whether or not there is a coincidence state according to parallel operation conditions.

Hereinafter, the single phase (1Φ) transformer 210 and the examination apparatus 220 are demonstrated more concretely.

Example of single phase transformer 210

3 is a diagram exemplarily illustrating a single phase (1Φ) transformer 210 according to an embodiment of the present invention in more detail.

As shown in Figure 3, the single-phase transformer 210 according to an embodiment of the present invention is connected to the overhead distribution line is a high-voltage cable connection portion 211 that is supplied through a high pressure bushing (not shown), and A load switch unit 212 for opening and closing the flow of high pressure, a low pressure output unit 213 for converting the high pressure supplied from the load switch 212 into low pressure and outputting it through a low pressure bushing (not shown), and the low pressure The electronic switch 214 which automatically cuts off the voltage according to the state of overload or fault current during parallel operation sent from the scanning device 220 supplied with the low pressure of the output unit 213, and supplied from the electronic switch 214. Low voltage cable connection 215 for transmitting the low pressure to the low voltage line of the connected overhead distribution line, and the inherent functions of the corresponding components such as the load switch unit 212, the low voltage output unit 213 and the electronic switch 214. On the check result detected by Check result display unit 216 to display, and comprises a control unit 217 for controlling data flow between the components.

As described above, the single-phase transformer 210 of the present invention can realize a miniaturization and light weight by newly configuring the load switch 212 and the electronic switch 214 instead of the existing high voltage switch. The load switch 212 and the electronic switch 214 will be described in more detail in Figures 4 and 5, respectively.

Example of load switch 212

4 is a diagram illustrating an example of a transformer-embedded load switch 212 according to an embodiment of the present invention, the transformer-embedded load switch 212 of the present invention is operated in a transformer insulating oil, operation (1) Is the ON state of the input power supply and the transformer, and operation (2) indicates that the transformer power is OFF. As such, the load switch 212 is to be opened and closed in the load state through the progress of the energized and interrupted state, it is possible to replace the high voltage switch installed outside the existing transformer.

Example of the electronic switch 214

5 is a view exemplarily showing an electronic switch 214 for parallel operation according to an embodiment of the present invention.

As shown in Figure 5, the electronic switch 214 for parallel operation according to an embodiment of the present invention is the operation of the MC ₁ when the parallel operation condition is established (ON) of the magnetic holding circuit (214A, 214B) When power is supplied from ① to ②, ⑤ of the auxiliary contact 214C of MC ₁ is opened to indicate the open state by the OFF indicator (blue display), and the auxiliary contact 214C of MC ₁ during operation (ON). Short-circuit ④ to display short-circuit status by ON indicator (red display). In addition, the electronic switch 214 for parallel operation of the present invention is connected to the b contact of the auxiliary relay of R ₄ and R ₇ in accordance with the state sent from the inspection apparatus 220, if the parallel operation condition is not established, R ₄ auxiliary The relay is made inoperable and automatic shutoff is performed during operation.

In particular, when the protection relay (EOCR) is operated by an overload or a fault current in the single-phase transformer 210 during parallel operation, the auto-blocking is performed by the b contact of the auxiliary relay R ₇ associated with the protection relay. In addition, the electronic switch 214 for parallel operation of the present invention is the characteristic difference between the full load current (434.8A) of the 1Φ 100KVA single-phase transformer 210 of MC ₁ and the single-phase transformer 210 and the column-phase transformer (200B) in parallel operation It has the advantage of being able to withstand up to 600A by being able to withstand the circulating current generated by

Example of the examination apparatus 220

6 is a diagram illustrating an example of the examination apparatus 220 according to an embodiment of the present invention.

6, the inspection apparatus 220 according to an embodiment of the present invention is a single-phase transformer voltmeter 221 for detecting the voltage on the RT on the single-phase transformer 210 side, and the column-phase transformer 200B side R / T inspection detector for detecting the phase difference between the phase transformer voltmeter 222 for detecting the voltage on RT and the potential difference between the R and T phases between the single phase transformer 210 and the column transformer 200B. 223, when the parallel operation condition is not matched due to a phase angle mismatch in the R / T inspection detector 223, when a corresponding first voltage occurs, the R / T inspection detector 223 operates according to the first voltage, A protective relay 224 that determines the same abnormal state, an auxiliary relay 225 which is operated according to the first voltage and serves to suppress the operation of the electronic switch, and a corresponding component such as a single phase transformer voltmeter ( 221), column transformer Control the flow of data between the check result display unit 226 and the components, which indicate the state of the point latch result detected by the unique functions such as the pressure gauge 222, the R / T detection detector 223, the protective relay 224, and the like. It comprises a control unit 227. The R / T inspection detector 223 and the protection relay 224 will be described in more detail later with reference to FIGS. 7 and 8.

Examples of R / T inspection detector 223 and protective relay 224

FIG. 7 is a diagram illustrating the relationship between the R / T inspection detector 223 and the protection relay 224 and the protection relay 224 according to an embodiment of the present invention in more detail.

Referring to FIG. 7, the R / T inspection detector 223 according to an embodiment of the present invention detects the potential difference between the R and T phases between the single phase transformer 210 and the column transformer 200B, respectively, to match the phase angles. When the detected potential difference is 30V or more, it is operated to detect and operate a voltage corresponding to the potential difference. In this case, the corresponding voltage may be referred to as a voltage generated when the parallel operation conditions are not met. Here, the R / T inspection detector 223 may subdivide and display the voltage difference caused by the phase difference by one volt (V).

The protection relay 224 of the present invention associated with the R / T inspection detector 223 has no parallel operation condition between the single-phase transformer 210 and the column transformer 200B, so that the R / T inspection detector 223, VM ₁₎ is when the operation to operate the R ₁ of the auxiliary relay 225 is linked, when R ₁ is the operation to activate the R ₄ of the auxiliary relay (225) associated with it and displayed as a buzzer (BZ) for warning In addition, by opening the contact b of R ₄ of the auxiliary relay 225 associated with MC ₁ of the electronic switch 214 for parallel operation, it becomes impossible to operate when waiting for operation, and stops operation when operating.

In addition, the protection relay 224 of the present invention is to operate the overcurrent protection relay (EOCR) when detecting the overload or fault current in the single-phase transformer 210, and to operate the R ₇ of the associated auxiliary relay 225, the electronic switch At the same time, MC ₁ of 214 can be opened (OFF) and the overload state can be displayed in red, and at the same time, the alarm buzzer BZ is added. Meanwhile, the protection relay 224 of the present invention further includes a malfunction preventing timer 224A, which will be described with reference to FIG. 8.

Malfunction prevention timer example

8 is a diagram illustrating an operation principle of a malfunction preventing timer 224A according to an embodiment of the present invention.

Referring to FIG. 8, the malfunction prevention timer 224A according to an embodiment of the present invention has an electronic switch for parallel operation if a parallel operation condition between the single phase transformer 210 and the column transformer 200B is established when attempting parallel operation. 214 of MC ₁ is enabled, and once the parallel operation is successful, the auxiliary of R ₄ associated with the R / T detection detector 223, VM ₁ once a predetermined time e.g. 5 seconds has elapsed. Blocking the relay 225 prevents the malfunction of the MC ₁ of the electronic switch 214 due to the malfunction of the inspection apparatus 220 or the abnormal voltage that may occur in the overhead distribution line system to prevent the power failure accident in advance. do.

Display example of the examination apparatus 220

9 is a view showing a display configuration according to the execution result of the imaging apparatus 220 according to an embodiment of the present invention

Referring to FIG. 9, the inspection apparatus 220 of the present invention includes the following on the surface of the inspection apparatus 220 so that a user can easily check and operate the results performed by each component of FIGS. 2 to 8. The display configuration can be implemented. That is, the transmission indicator 1 of the present invention indicates that the electricity of the single-phase transformer 210 is supplied, and the normal indicator 2 indicates that the single-phase transformer 210 and the column-phase transformer 200B match the parallel operation conditions. The abnormality indicator 3 indicates the result of the inconsistent state of parallel operation condition between the two transformers 210 and 200B in red.

In addition, the overload indicator (4) of the present invention is notified when the overload or fault current is detected in the red state that the EOCR was operated by overload, the first test voltmeter (5) is a single-phase transformer 210 and the column transformer (200B) The R phase potential difference between the two phases is detected, and the second test voltmeter lamp 6 detects the potential difference between the T phases and detects whether or not the parallel operation is possible. At this time, the vehicle is shut down while driving and disabled while driving.

In addition, the first voltmeter lamp 7 of the present invention, the voltage of the RT phase of the single-phase transformer 210, the second voltmeter lamp 8 informs the voltage of the RT phase of the column-phase transformer 200B, ammeter lamps (9, 10) ) Indicates the load current by instructing the load current of R and T phases, and the power supply of the inspection apparatus S / W lamp 11 is a switch for operating power of the inspection device, and the input S / W lamp 12 is parallel operation input and two. Only when the parallel operation condition between the transformers 210 and 200B is established (the present type is preferable so that the present invention is explained), and the stop S / W lamp 13 drives the S / W to stop the low pressure switch. It is to.

In addition, the lamp test S / W lamp 14 of the present invention informs the lamp test to test whether all the indicators of the inspection apparatus are normally operated. If there is an indicator that does not light up when it is turned on, there is a problem with the function or the indicator It can be checked for faults and the cause can be identified. The buzzer stop S / W light (15) is used to stop the alarm buzzer (BZ) when the error indicator lights up when an error occurs during operation, and to stop it, and the buzzer (16) has two transformers (210, 200B). The parallel operation condition is not established or the overload is indicated by the buzzer (BZ).

1 is a configuration diagram showing a conventional transformer unit 100 for uninterruptible construction.

2 is a configuration diagram illustrating a relationship between an uninterruptible single phase transformer device and a column transformer according to an embodiment of the present invention.

3 is a diagram exemplarily illustrating a single phase (1Φ) transformer 210 according to an embodiment of the present invention in more detail.

4 is a diagram illustrating a transformer-mounted load switch 212 according to an embodiment of the present invention by way of example.

5 is a view exemplarily showing an electronic switch 214 for parallel operation according to an embodiment of the present invention.

6 is a diagram illustrating an example of the examination apparatus 220 according to an embodiment of the present invention.

FIG. 7 is a diagram illustrating the relationship between the R / T inspection detector 223 and the protection relay 224 and the protection relay 224 according to an embodiment of the present invention in more detail.

8 is a diagram illustrating an operation principle of a malfunction preventing timer 224A according to an embodiment of the present invention.

9 is a view showing a display configuration according to the result of performing the imaging apparatus 220 according to an embodiment of the present invention.

Claims (5)

Mobile single-phase transformer device for uninterrupted replacement and failure of pole-type transformer Inspection apparatus for inspecting the coincidence state of parallel operation conditions including detection of parallel operation by detecting potential difference between single-phase transformer and column transformer, detection of abnormal state of overload and fault current, and A load switch for opening and closing the flow of high pressure supplied from the overhead distribution line and an electronic switch for automatically cutting off the current flow according to the state inspected by the inspection device, and converting the high pressure supplied through the load switch to low pressure. A single-phase (1Φ) transformer that converts and transmits the converted low pressure to the low voltage line of the overhead distribution line via the electromagnetic switch. Mobile single phase transformer device comprising a. The method of claim 1, The single phase transformer, High voltage cable connection to the overhead power distribution line, Load switch unit for opening and closing the high pressure flow, Low pressure output unit for converting the high pressure supplied from the load switch to a low pressure and outputting, When the low voltage power of the low voltage output unit is supplied, the electronic switch to automatically cut off the voltage according to the state of overload or fault current during parallel operation, and Low voltage cable connection for transmitting the low voltage power supplied from the electronic switch to the low voltage line of the connected overhead distribution line Mobile single phase transformer device comprising a. The method of claim 1, The inspection apparatus, Single phase transformer voltmeter for detecting the voltage on the R-T phase on the single-phase transformer side, A pole transformer voltmeter for detecting a voltage on the R-T phase at the pole transformer side; An R / T inspection detector for detecting a potential difference between R and T phases between the single-phase transformer and the column-phase transformer to determine whether the phase angles coincide with each other; When the parallel operation condition is not matched due to mismatched phase angles in the R / T inspection detector, a first voltage corresponding thereto is operated according to the first voltage, and protection for determining an abnormal state such as an overload or a fixed current. Relay, and An auxiliary relay operated according to said first voltage to suppress operation of said electromagnetic switch; Mobile single phase transformer device comprising a. The method of claim 3, The R / T examination detection system, And the first voltage corresponding to the potential difference operates when the detected potential difference is 30 V or more. The method of claim 3, The protective relay, If the R / T inspection detection system malfunctions due to the abnormal voltage of the overhead distribution line system during parallel operation, it further comprises a malfunction prevention timer for detecting a signal according to the malfunction and informs the protection relay whether or not it is a malfunction. Single phase transformer device.

Images