CN109738761B - Distribution network simulation test ground fault point array switching device - Google Patents
Distribution network simulation test ground fault point array switching device Download PDFInfo
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- CN109738761B CN109738761B CN201910139098.1A CN201910139098A CN109738761B CN 109738761 B CN109738761 B CN 109738761B CN 201910139098 A CN201910139098 A CN 201910139098A CN 109738761 B CN109738761 B CN 109738761B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention provides a ground fault point array switching device for a power distribution network simulation test, which comprises a knob switch, a multi-contact array switching switch, a rotary transmission chain and a control circuit module, wherein the multi-contact array switching switch comprises 3 switching switches, the switching switch comprises a moving contact module and a fixed contact module, the moving contact module comprises a moving contact and a circular insulating plate, the fixed contact module comprises a fixed contact and a square insulating plate, the moving contact module is movably arranged in the fixed contact module, and the moving contact and the fixed contact can be in rotary contact. The invention adopts the combination of the knob switch, the multi-contact array change-over switch, the rotary transmission chain and the control circuit module, optimizes the grounding switch array required by the test, achieves the aim of switching the multi-time grounding point array by a small amount of moving contacts, reduces the cost, saves the space, adopts the control circuit module to carry out electric control, has the advantages of automation, accuracy, convenience and safety, and provides key component guarantee for an intelligent power distribution network simulation test platform.
Description
Technical Field
The invention is mainly applied to the field of 10kV distribution network ground fault simulation test platforms, and particularly relates to a ground fault point array switching device for a distribution network simulation test.
Background
In recent years, with the development of economy in China, the construction investment of a power distribution network is continuously increased, and the power distribution network is increasingly huge and complex, so that a power distribution network ground fault simulation test platform needs to comprise various outgoing lines, each line needs a plurality of ground switches, and a huge ground fault point array group is inevitably formed, which is not realistic and uneconomical. The distribution network ground fault simulation test line switching device well solves the problems, and provides facility guarantee for ground fault analysis and research of a complex distribution network.
Disclosure of Invention
The technical problem solved by the invention is to provide the ground fault point array switching device for the power distribution network simulation test, which is characterized in that a knob switch, a multi-contact array switching switch, a rotary transmission chain and a control circuit module are combined, so that the ground switch array required by the test is optimized, the manufacturing cost is reduced, the space is saved, and the ground fault point array switching device has the advantages of automation, accuracy, convenience and safety, and provides a key component guarantee for an intelligent power distribution network simulation test platform.
The technical solution for realizing the purpose of the invention is as follows:
the utility model provides a distribution network simulation test earth fault point array auto-change over device, includes knob switch, multi-contact array change over switch, rotatory drive chain and control circuit module, and knob switch, multi-contact array change over switch pass through mechanical connection with rotatory drive chain in proper order, and the control circuit module is connected with rotatory drive chain between electricity, and the gear of knob switch 11 includes 1 keeps off, 2 keeps off, keeps off 3;
the multi-contact array change-over switch comprises 3 change-over switches, namely an A phase, a B phase and a C phase, wherein the 3 change-over switches are arranged at intervals, each change-over switch comprises a moving contact module and a fixed contact module, the moving contact module comprises a plurality of moving contacts and a circular insulating plate, the moving contacts are fixedly arranged outside the circular insulating plate in an annular shape and extend out, and the moving contacts are centrally symmetrical with respect to the circle center of the circular insulating plate; the static contact module comprises a plurality of static contacts and a square insulating plate, a central round hole is formed in the square insulating plate, the diameter of the central round hole is larger than that of the round insulating plate, the static contacts are fixedly arranged on the inner side of the central round hole of the square insulating plate in an annular mode and extend out, and the static contacts are in central symmetry with respect to the virtual circle center of the central round hole; the movable contact module is movably arranged in the central round hole of the fixed contact module, the circle center of the round insulating plate coincides with the virtual circle center of the central round hole, and the movable contact and the fixed contact can be in rotary contact.
Further, according to the distribution network simulation test ground fault point array switching device, the difference D between the diameter of the central round hole and the diameter of the round insulating plate meets the following conditions: d is more than or equal to 5mm and less than or equal to 10mm.
Furthermore, according to the power distribution network simulation test ground fault point array switching device, the number of the fixed contacts in 1 switching switch is 3 times that of the moving contacts.
Furthermore, according to the power distribution network simulation test ground fault point array switching device, the number of moving contacts in 1 switching switch is 6, and the number of static contacts is 18.
Further, according to the ground fault point array switching device for the power distribution network simulation test, the rotary transmission chain comprises the motor, the gears, the chains and the transmission shafts, the transmission shafts penetrate through the circle centers of the 3 circular insulating plates and are fixedly connected with the circle centers, one end of each transmission shaft is fixedly connected with the knob switch, the gears are fixedly arranged at the other ends of the transmission shafts, the gears are connected with the motor through the chains, and the motor is electrically connected with the control circuit module.
Further, according to the power distribution network simulation test ground fault point array switching device, the control circuit module comprises a universal knob switch, a first travel switch, a second travel switch, a third travel switch, a first alternating current contactor, a second alternating current contactor and a capacitor, wherein contacts 1, 3 and 5 of the universal knob switch are connected to a zero line, contacts 1, 3 and 5 correspond to contacts 2, 4 and 6 respectively, gears 1, 2 and 3 of the knob switch correspond to the closing of contacts 3 and 4 of the universal knob switch respectively, and contacts 1 and 2 are closed, and contacts 5 and 6 are closed; one end of the first normally open contact of the first alternating current contactor is connected in parallel with the normally open contact of the first travel switch, then the first normally open contact is connected with the coil of the first alternating current contactor in series, the other end of the first normally open contact is connected with the contact 2, and the other end of the coil of the first alternating current contactor is connected with the live wire; one end of the first normally open contact of the second alternating current contactor is connected in parallel with the normally open contact of the third travel switch, and then the other end of the first normally open contact of the second alternating current contactor is connected with the coil of the second alternating current contactor in series, the other end of the first normally open contact of the second alternating current contactor is connected with the normally closed contact of the second travel switch and the contact 2, the other end of the coil of the second alternating current contactor is connected to the live wire, and the other end of the normally closed contact of the second travel switch is connected to the zero wire; the normally closed contact of the first alternating current contactor, the normally closed contact of the first travel switch and the second normally open contact of the second alternating current contactor are connected to the point A, the other end of the normally closed contact of the first alternating current contactor is connected with a reversing interface of the motor, the other end of the normally closed contact of the first travel switch is connected with the contact 4, and the other end of the second normally open contact of the second alternating current contactor is connected with a zero line; the normally closed contact of the second alternating current contactor, the normally closed contact of the third travel switch and the second normally open contact of the first alternating current contactor are connected to the point B, the other end of the normally closed contact of the second alternating current contactor is connected with a positive switching port of the motor, the other end of the normally closed contact of the third travel switch is connected with the contact 6, and the other end of the second normally open contact of the first alternating current contactor is connected with a zero line; the two ends of the capacitor are respectively connected with a forward rotation interface and a reverse rotation interface of the motor, and the other input end of the motor is connected with a live wire.
Compared with the prior art, the technical scheme provided by the invention has the following technical effects:
1. according to the power distribution network simulation test ground fault point array switching device, the ground switch array required by a test is optimized, the number of the ground switches is reduced, and the space is saved;
2. the power distribution network simulation test ground fault point array switching device uses the control circuit module to perform electric control, and is convenient, accurate and safe to switch;
3. the ground fault point array switching device for the power distribution network simulation test reduces test cost and can provide guarantee for the power distribution network simulation test platform.
Drawings
FIG. 1 is a schematic diagram of a switching device for an array of ground fault points in a power distribution network simulation test according to the present invention;
FIG. 2 is a schematic diagram of a diverter switch of the power distribution network simulation test ground fault point array diverter device of the present invention;
FIG. 3 is a schematic diagram of a moving contact module of the distribution network simulation test ground fault point array switching device of the present invention;
FIG. 4 is a schematic diagram of a stationary contact module of the distribution network simulation test ground fault point array switching device of the present invention;
FIG. 5 is a schematic diagram of a rotary switch of the distribution network simulation test ground fault point array switching device of the present invention;
fig. 6 is a schematic diagram of a control circuit module of the distribution network simulation test ground fault point array switching device of the present invention.
Reference numerals meaning: 1: change-over switch, 2: moving contact, 3: circular insulation board, 4: stationary contact, 5: square insulating plate, 6: center round hole, 7: motor, 8: gear, 9: chain, 10: transmission shaft, 11: a knob switch.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
The utility model provides a distribution network simulation test earth fault point array switching device, includes knob switch 11, multi-contact array change-over switch, rotatory drive chain and control circuit module, and knob switch 11, multi-contact array change-over switch pass through mechanical connection with rotatory drive chain in proper order, and the control circuit module is connected with rotatory drive chain electricity; the multi-contact array change-over switch comprises 3 change-over switches 1, namely an A phase, a B phase and a C phase, wherein the 3 change-over switches 1 are arranged at a certain distance in sequence, each change-over switch 1 comprises a moving contact module and a fixed contact module, wherein the moving contact module comprises a plurality of moving contacts 2 and a circular insulating plate 3, the moving contacts 2 are fixedly arranged on the outer side of the circular insulating plate 3 in an annular shape and extend out, and the moving contacts 2 are centrally symmetrical with respect to the circle center of the circular insulating plate 3; the static contact module comprises a plurality of static contacts 4 and a square insulating plate 5, a central round hole 6 is formed in the square insulating plate 5, the diameter of the central round hole 6 is larger than that of the circular insulating plate 3, the static contacts 4 are fixedly arranged on the inner side of the central round hole 6 of the square insulating plate 5 in an annular mode and extend out, and the static contacts 4 are in central symmetry with respect to the virtual center of the central round hole 6; the movable contact module is movably arranged in a central round hole 6 of the fixed contact module, the circle center of the circular insulating plate 3 is coincident with the virtual circle center of the central round hole 6, and the movable contact 2 and the fixed contact 4 can be in rotary contact.
Example 1
The utility model provides a distribution network simulation test earth fault point array auto-change over device, is shown as the fig. 1, includes rotary switch 11, multi-contact array change over switch, rotatory drive chain and control circuit module, rotary switch 11, multi-contact array change over switch pass through mechanical connection with rotatory drive chain in proper order, and the electricity is connected between control circuit module and the rotatory drive chain, and rotary switch 11's gear includes 1 keeps off, keeps off 2, keeps off 3, is shown as fig. 5.
The multi-contact array change-over switch comprises 3 change-over switches 1, wherein the 3 change-over switches are A phase, B phase and C phase in sequence, the 3 change-over switches 1 are installed at a certain distance, and each change-over switch 1 comprises a moving contact module and a fixed contact module, as shown in figure 2.
As shown in fig. 3, the moving contact module includes 6 moving contacts 2 and a circular insulating plate 3, the 6 moving contacts 2 are fixedly installed on the outer side of the circular insulating plate 3 in a ring shape and extend out, and the moving contacts 2 are centrally symmetrical with respect to the center of the circular insulating plate 3.
As shown in fig. 4, the static contact module includes 18 static contacts 4 and square insulating plates 5, where the frames 1, 2, 3, 4, 5, and 6 are static contacts in an overhead line area, the frames 1, 2, 3, 4, 5, and 6 are static contacts in a cable line area, and the groups 1, 2, 3, 4, 5, and 6 are static contacts in a combined line area. The square insulating plate 5 is provided with a central round hole 6, the difference between the diameter of the central round hole 6 and the diameter of the round insulating plate 3 is 5mm,18 static contacts 4 are fixedly arranged on the inner side of the central round hole 6 of the square insulating plate 5 in an annular shape and extend out, and the static contacts 4 are in central symmetry about the virtual center of the central round hole 6; the movable contact module is movably arranged in a central round hole 6 of the fixed contact module, the circle center of the circular insulating plate 3 is coincident with the virtual circle center of the central round hole 6, and the movable contact 2 and the fixed contact 4 are rotatably connected.
The rotary transmission chain comprises a motor 7, a gear 8, a chain 9 and a transmission shaft 10, wherein the transmission shaft 10 penetrates through the circle centers of the 3 circular insulating plates 3 and is fixedly connected with the circle centers, one end of the transmission shaft 10 is fixedly connected with a knob switch 11, the gear 8 is fixedly arranged at the other end of the transmission shaft 10, the gear 8 is connected with the motor 7 through the chain 9, and the motor 7 is electrically connected with the control circuit module.
The control circuit module drives the rotary transmission chain to move so that the movable contact module of the change-over switch rotates, and under the limit of the travel switch of the control circuit module, the movable contact of each change-over switch is respectively closed or opened with the fixed contacts in three different areas, so that the aim of switching 18 fixed contacts, namely 3 times the number of the ground fault point arrays, by using 6 movable contacts is fulfilled, and the automatic, accurate, convenient and safe ground fault point array has the advantages of being automatic, accurate, convenient and safe.
The moving contacts I, II, III, IV, V and VI are closed or opened with the fixed contacts in 3 different areas, namely: when the movable contact is closed with the fixed contact in the cable line area, the grounding test can be performed by connecting the cable line area; when the motor 7 is reversed to the overhead line area, the moving contact is disconnected with the fixed contact of the cable line area and is closed with the fixed contact of the overhead line area, and at the moment, the grounding test can be carried out by connecting the overhead line area; when the motor 7 continues to rotate forward to the combined line area, the moving contact and the fixed contact of the combined line area are closed, and at the moment, the combined line area is connected to perform a grounding test.
The control circuit controls the motor 7 to rotate forward or reversely, and the travel switch is used for positioning to control the change-over switch to act or stop in three different areas of the fixed contact, so that the purpose of switching the circuit is realized.
The control circuit module includes a universal knob switch SQ, a first travel switch SA1, a second travel switch SA2, a third travel switch SA3, a first ac contactor KM1, a second ac contactor KM2, and a capacitor C, as shown in fig. 6. The contacts 1, 3 and 5 of the universal knob switch SQ are connected to the zero line N, the contacts 1, 3 and 5 correspond to the contacts 2, 4 and 6 respectively, the gear positions 1, 2 and 3 of the knob switch 11 correspond to the contacts 3 and 4 of the universal knob switch SQ to be closed, the contacts 1 and 2 to be closed and the contacts 5 and 6 to be closed respectively.
One end of the first normally open contact KM1-1 of the first alternating current contactor is connected in parallel with the normally open contact of the first travel switch SA1 and then connected with the coil KM1 of the first alternating current contactor in series, the other end of the first normally open contact is connected with the contact 2, and the other end of the coil KM1 of the first alternating current contactor is connected to the live wire L.
One end of the first normally open contact KM2-1 of the second alternating current contactor is connected in parallel with the normally open contact of the third travel switch SA3, and then is connected in series with the coil KM2 of the second alternating current contactor, the other end of the first normally open contact is connected with the normally closed contact and the contact 2 of the second travel switch SA2, the other end of the coil KM2 of the second alternating current contactor is connected to the live wire L, and the other end of the normally closed contact of the second travel switch SA2 is connected to the null wire N.
The normally closed contact KM1-3 of the first alternating current contactor, the normally closed contact of the first travel switch SA1 and the second normally open contact KM2-2 of the second alternating current contactor are connected to a point A, the other end of the normally closed contact KM1-3 of the first alternating current contactor is connected with a reversing interface of the motor 7, the other end of the normally closed contact of the first travel switch SA1 is connected with a contact 4, and the other end of the second normally open contact KM2-2 of the second alternating current contactor is connected with a zero line N.
The normally closed contact KM2-3 of the second alternating current contactor, the normally closed contact of the third travel switch SA3 and the second normally open contact KM1-2 of the first alternating current contactor are connected to a point B, the other end of the normally closed contact KM2-3 of the second alternating current contactor is connected with a positive switching port of the motor 7, the other end of the normally closed contact of the third travel switch SA3 is connected with a contact 6, and the other end of the second normally open contact KM1-2 of the first alternating current contactor is connected with a zero line N. The two ends of the capacitor C are respectively connected with a forward rotation interface and a reverse rotation interface of the motor 7, and the other input end of the motor 7 is connected with a live wire.
The control circuit module controls the action and stop of the change-over switch, the 3 travel switches respectively correspond to three areas of the static contact module, and the 2 alternating current contactors are used for processing two different conditions when the change-over switch is switched to the middle area. Meanwhile, the normal-closed contact of the alternating-current contactor is utilized in the control circuit module to interlock the forward and reverse rotation power supply of the motor 7, so that the motor 7 cannot be damaged due to simultaneous power on of forward and reverse rotation.
The specific circuit control flow is as follows:
since the change-over switch has only three states, SA1, SA2, SA3 must be operated with only one switch. When the 1 and 2 contacts of the SQ are closed and the SA1 normally open contact is closed, the coil KM1 is electrified and self-locked, the normally open contacts KM1-1 and KM1-2 are closed, the motor is electrified and rotates positively, and meanwhile the normally closed contacts KM1-3 are disconnected to prevent the motor from rotating positively and negatively and electrifying simultaneously until the SA2 acts, the SA2 normally closed contact is disconnected, the coil KM1 is powered off, and the motor is powered off and stopped; when the 1 and 2 contacts of the SQ are closed and the SA3 normally open contact is closed, the coil KM2 is electrified and self-locked, the normally open contacts KM2-1 and KM2-2 are closed, the motor is electrified and rotates positively, and meanwhile the normally closed contacts KM1-3 are disconnected to prevent the motor from rotating positively and negatively and electrifying simultaneously until the SA2 acts, the SA2 normally closed contact is disconnected, the coil KM2 is powered off, and the motor is powered off and stopped. When the 3 and 4 contacts of the SQ are closed, the motor is electrified and reversed until the SA1 acts, the normally closed contact of the SA1 is opened, and the motor is stopped after the power is cut off. When the 5 and 6 contacts of the SQ are closed, the motor is electrified to rotate positively until the SA3 acts, the SA3 normally-closed contact is opened, and the motor is stopped after the power is cut off.
Example operations are as follows:
when the knob switch 11 is turned from the gear 2 to the gear 1, the 3 and 4 contacts of the SQ are closed, the motor is reversed until the motor is in contact with the travel switch SA1, the normally closed contact of the travel switch SA1 is opened, the motor is powered off to stop working, and the moving contacts I, II, III, IV, V and VI are respectively stopped on the static contacts of the frame 1, the frame 2, the frame 3, the frame 4, the frame 5 and the frame 6. In this case from a cable line to an overhead line.
When the knob switch 11 is turned from the gear 1 to the gear 2, the contacts 1 and 2 of the SQ are closed, the normally open contact of the travel switch SA1 is closed, the coil KM1 is electrified and self-locked, the normally open contact KM1-2 is closed to enable the motor to be electrified and rotate forward until the normally open contact contacts touch the travel switch SA2, the normally closed contact of the travel switch SA2 is opened to enable the coil KM1 to be powered off, the normally open contact KM1-2 is restored, the motor is powered off to stop working, and the moving contacts I, II, III, IV, V and VI are respectively stopped on the static contacts of the electricity 1, the electricity 2, the electricity 3, the electricity 4, the electricity 5 and the electricity 6. In this case from overhead line to cabling.
When the knob switch 11 is turned from the gear 3 to the gear 2, the contacts 1 and 2 of the SQ are closed, the normally open contact of the travel switch SA3 is closed, the coil KM2 is electrified and self-locked, the normally open contact KM2-2 is closed to enable the motor to be electrified and reversely rotated until the motor touches the travel switch SA2, the normally closed contact of the travel switch SA2 is opened to enable the coil KM2 to be powered off, the normally open contact KM2-2 is restored, the motor is powered off to stop working, and the moving contacts I, II, III, IV, V and VI are respectively stopped on the static contacts of the electricity 1, the electricity 2, the electricity 3, the electricity 4, the electricity 5 and the electricity 6. In this case, the switching from the combined line to the cable line is performed.
When the knob switch 11 is turned from the gear 1 or the gear 2 to the gear 3, when the contacts of 5 and 6 of SQ are closed, the motor rotates forward until the motor touches the travel switch SA3, the normally closed contact of the travel switch SA3 opens the motor to cut off power and stop working, and the moving contacts I, II, III, IV, V and VI are respectively connected with the fixed contacts of the groups 1, 2, 3, 4, 5 and 6, and then the overhead line or the cable line is switched to the combined line.
Example 2
The utility model provides a distribution network analogue test earth fault point array auto-change over device, includes rotary switch 11, multi-contact array change over switch, rotatory drive chain and control circuit module, and rotary switch 11, multi-contact array change over switch pass through mechanical connection with rotatory drive chain in proper order, and the electricity is connected between control circuit module and the rotatory drive chain, and rotary switch 11's gear includes 1 keeps off, 2 keeps off, keeps off 3.
The multi-contact array change-over switch comprises 3 change-over switches 1, wherein the three change-over switches are A phase, B phase and C phase in sequence, the 3 change-over switches 1 are installed at a certain distance, and each change-over switch 1 comprises a moving contact module and a fixed contact module. The movable contact module comprises 6 movable contacts 2 and a circular insulating plate 3, wherein the 6 movable contacts 2 are fixedly arranged on the outer side of the circular insulating plate 3 in an annular shape and extend out, and the movable contacts 2 are centrally symmetrical with respect to the circle center of the circular insulating plate 3. The static contact module comprises 18 static contacts 4 and a square insulating plate 5, a central round hole 6 is formed in the square insulating plate 5, the difference between the diameter of the central round hole 6 and the diameter of the circular insulating plate 3 is 10mm, the 18 static contacts 4 are fixedly arranged on the inner side of the central round hole 6 of the square insulating plate 5 in an annular shape and extend out, and the static contacts 4 are in central symmetry about the virtual center of the central round hole 6; the movable contact module is movably arranged in a central round hole 6 of the fixed contact module, the circle center of the circular insulating plate 3 is coincident with the virtual circle center of the central round hole 6, and the movable contact 2 and the fixed contact 4 are rotatably connected.
The rotary transmission chain comprises a motor 7, a gear 8, a chain 9 and a transmission shaft 10, wherein the transmission shaft 10 penetrates through the circle centers of the 3 circular insulating plates 3 and is fixedly connected with the circle centers, one end of the transmission shaft 10 is fixedly connected with a knob switch 11, the gear 8 is fixedly arranged at the other end of the transmission shaft 10, the gear 8 is connected with the motor 7 through the chain 9, and the motor 7 is electrically connected with the control circuit module.
The control circuit module comprises a universal knob switch, a first travel switch, a second travel switch, a third travel switch, a first alternating current contactor, a second alternating current contactor and a capacitor. The contacts 1, 3 and 5 of the universal knob switch are connected to a zero line, the contacts 1, 3 and 5 correspond to the contacts 2, 4 and 6 respectively, the gears 1, 2 and 3 of the knob switch 11 correspond to the contacts 3 and 4 of the universal knob switch to be closed, the contacts 1 and 2 to be closed and the contacts 5 and 6 to be closed respectively. The first normally open contact of the first alternating current contactor is connected with the normally open contact of the first travel switch in parallel, one end of the first normally open contact is connected with the coil of the first alternating current contactor in series, the other end of the first normally open contact is connected with the contact 2, and the other end of the coil of the first alternating current contactor is connected to the live wire. One end of the first normally open contact of the second alternating current contactor is connected in parallel with the normally open contact of the third travel switch, then the first normally open contact is connected with the coil of the second alternating current contactor in series, the other end of the first normally open contact is connected with the normally closed contact of the second travel switch, the contact 2 is connected with the normally closed contact of the second travel switch, the other end of the coil of the second alternating current contactor is connected with the live wire, and the other end of the normally closed contact of the second travel switch is connected with the zero line. The normally closed contact of the first alternating current contactor, the normally closed contact of the first travel switch and the second normally open contact of the second alternating current contactor are connected to the point A, the other end of the normally closed contact of the first alternating current contactor is connected with a reversing interface of the motor 7, the other end of the normally closed contact of the first travel switch is connected with the contact 4, and the other end of the second normally open contact of the second alternating current contactor is connected with a zero line. The normally closed contact of the second alternating current contactor, the normally closed contact of the third travel switch and the second normally open contact of the first alternating current contactor are connected to the point B, the other end of the normally closed contact of the second alternating current contactor is connected with a positive switching port of the motor 7, the other end of the normally closed contact of the third travel switch is connected with the contact 6, and the other end of the second normally open contact of the first alternating current contactor is connected with a zero line. The two ends of the capacitor are respectively connected with a forward rotation interface and a reverse rotation interface of the motor 7.
While only a few embodiments of the present invention have been described, it should be noted that modifications could be made by those skilled in the art without departing from the principles of the present invention, which modifications are to be regarded as being within the scope of the invention.
Claims (4)
1. The ground fault point array switching device for the power distribution network simulation test is characterized by comprising a knob switch (11), a multi-contact array switching switch, a rotary transmission chain and a control circuit module, wherein the knob switch (11) and the multi-contact array switching switch are sequentially and mechanically connected with the rotary transmission chain, the control circuit module is electrically connected with the rotary transmission chain, and the gear of the knob switch 11 comprises 1 gear, 2 gear and 3 gear;
the multi-contact array change-over switch comprises 3 change-over switches (1), wherein the 3 change-over switches are A phase, B phase and C phase in sequence, the 3 change-over switches (1) are installed at a certain distance, each change-over switch (1) comprises a moving contact module and a fixed contact module, the moving contact module comprises a plurality of moving contacts (2) and a circular insulating plate (3), the moving contacts (2) are fixedly installed outside the circular insulating plate (3) in an annular shape and extend out, and the moving contacts (2) are centrally symmetrical with respect to the center of the circular insulating plate (3); the static contact module comprises a plurality of static contacts (4) and square insulating plates (5), wherein a central round hole (6) is formed in each square insulating plate (5), the diameter of each central round hole (6) is larger than that of each circular insulating plate (3), and the difference D between the diameter of each central round hole (6) and the diameter of each circular insulating plate (3) is as follows: d is more than or equal to 5mm and less than or equal to 10mm, the fixed contact (4) is annularly and fixedly arranged on the inner side of a central round hole (6) of the square insulating plate (5) and extends out, and the fixed contact (4) is centrally symmetrical with respect to the virtual center of the central round hole (6); the movable contact module is movably arranged in a central round hole (6) of the fixed contact module, the center of a round insulating plate (3) coincides with the virtual center of the central round hole (6), the movable contact (2) and the fixed contact (4) can be in rotatable contact, and the number of the fixed contacts (4) in the 1 change-over switch (1) is 3 times that of the movable contacts (2).
2. The distribution network simulation test ground fault point array switching device according to claim 1, wherein the number of moving contacts (4) in 1 switch (1) is 6, and the number of static contacts (4) is 18.
3. The ground fault point array switching device for the power distribution network simulation test according to claim 1, wherein the rotary transmission chain comprises a motor (7), a gear (8), a chain (9) and a transmission shaft (10), the transmission shaft (10) penetrates through the circle centers of the 3 circular insulating plates (3) and is fixedly connected with the circle centers, one end of the transmission shaft (10) is fixedly connected with a knob switch (11), the gear (8) is fixedly arranged at the other end of the transmission shaft (10), the gear (8) is connected with the motor (7) through the chain (9), and the motor (7) is electrically connected with the control circuit module.
4. The ground fault point array switching device for the power distribution network simulation test according to claim 1, wherein the control circuit module comprises a universal knob switch, a first travel switch, a second travel switch, a third travel switch, a first alternating current contactor, a second alternating current contactor and a capacitor, contacts 1, 3 and 5 of the universal knob switch are connected on a zero line, contacts 1, 3 and 5 correspond to contacts 2, 4 and 6 respectively, gears 1, 2 and 3 of a knob switch (11) correspond to contacts 3 and 4 of the universal knob switch to be closed, contacts 1 and 2 to be closed and contacts 5 and 6 to be closed respectively; one end of the first normally open contact of the first alternating current contactor is connected in parallel with the normally open contact of the first travel switch, then the first normally open contact is connected with the coil of the first alternating current contactor in series, the other end of the first normally open contact is connected with the contact 2, and the other end of the coil of the first alternating current contactor is connected with the live wire; one end of the first normally open contact of the second alternating current contactor is connected in parallel with the normally open contact of the third travel switch, and then the other end of the first normally open contact of the second alternating current contactor is connected with the coil of the second alternating current contactor in series, the other end of the first normally open contact of the second alternating current contactor is connected with the normally closed contact of the second travel switch and the contact 2, the other end of the coil of the second alternating current contactor is connected to the live wire, and the other end of the normally closed contact of the second travel switch is connected to the zero wire;
the normally closed contact of the first alternating current contactor, the normally closed contact of the first travel switch and the second normally open contact of the second alternating current contactor are connected to a point A, the other end of the normally closed contact of the first alternating current contactor is connected with a reversing interface of a motor (7), the other end of the normally closed contact of the first travel switch is connected with a contact 4, and the other end of the second normally open contact of the second alternating current contactor is connected with a zero line; the normally closed contact of the second alternating current contactor, the normally closed contact of the third travel switch and the second normally open contact of the first alternating current contactor are connected to the point B, the other end of the normally closed contact of the second alternating current contactor is connected with a positive switching port of the motor (7), the other end of the normally closed contact of the third travel switch is connected with the contact 6, and the other end of the second normally open contact of the first alternating current contactor is connected with a zero line;
the two ends of the capacitor are respectively connected with a forward rotation interface and a reverse rotation interface of the motor (7), and the other input end of the motor (7) is connected with a live wire.
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| CN112540267A (en) * | 2020-12-28 | 2021-03-23 | 华北科技学院 | Automatic fault point selection and switching centralized control device for power distribution network true test |
| CN112285492B (en) * | 2020-12-31 | 2021-04-13 | 中国电力科学研究院有限公司 | A system and method for ground fault test of distribution network |
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