CN106787222B - Main transformer neutral point grounding disconnecting link remote control circuit - Google Patents

Main transformer neutral point grounding disconnecting link remote control circuit Download PDF

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Publication number
CN106787222B
CN106787222B CN201710206285.8A CN201710206285A CN106787222B CN 106787222 B CN106787222 B CN 106787222B CN 201710206285 A CN201710206285 A CN 201710206285A CN 106787222 B CN106787222 B CN 106787222B
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China
Prior art keywords
switching
switch
remote control
branch
disconnecting link
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CN201710206285.8A
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CN106787222A (en
Inventor
李传东
代永恒
尹庆
何敬国
张化宾
王敏
李传红
赵兴永
付兆升
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Shandong Iron and Steel Co Ltd
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Shandong Iron and Steel Co Ltd
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    • H02J13/0006
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/04Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/20Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The embodiment of the application discloses a main transformer neutral point earthing knife-switch remote control circuit includes: the switching-on branch road and separating brake branch road, switching-on branch road and separating brake branch road parallel connection are provided with low pressure air switch, switch remote control clamp plate and distance on-the-spot change over switch jointly, wherein: the switching-on branch and the switching-off branch are electrically connected with an alternating current power supply through a low-voltage air switch, and the low-voltage air switch is used for controlling the switching-on and switching-off of the power supply; the switching-on branch is provided with a remote control switching-on relay normally-open contact, the switching-off branch is provided with a remote control switching-off relay normally-open contact, the remote control switching-on relay normally-open contact is respectively connected with one ends of the switching-on branch and the disconnecting link remote control pressing plate, and the remote control switching-off relay normally-open contact is respectively connected with one ends of the switching-off branch and the disconnecting link remote control pressing plate; the other end of the disconnecting link remote control pressing plate is electrically connected with a zero line N of the low-voltage air switch through the remote on-site change-over switch, so that the efficiency and the accuracy of the remote control switching-on and switching-off operation of the main transformer neutral point grounding disconnecting link are improved.

Description

Main transformer neutral point grounding disconnecting link remote control circuit
Technical Field
The application relates to the technical field of disconnecting link control circuits, in particular to a main transformer neutral point grounding disconnecting link remote control circuit.
Background
The closing and separating management of the neutral point grounding disconnecting link of the main transformer is an important measure for ensuring the safe operation of a power grid, and aims to prevent the potential damage to the insulation of the transformer caused by the operation overvoltage generated in the closing operation process of the main transformer, and provide conditions for the reliable zero sequence protection operation, so that the grounding disconnecting link is closed firstly when the transformer is put into operation for 110kV or above according to the power transformation operation rules, namely the neutral point of the transformer is grounded firstly, then the transformer is put into operation, and the neutral point grounding disconnecting link of the transformer is pulled open according to the grounding operation mode of the power grid system after the transformer is closed and transmitted.
In the prior art, before and after power transmission of the main transformer switching-on operation is realized, the switching-on and switching-off operation of the neutral point grounding disconnecting link is required to be carried out on site, the degree of automation is low, the operation time is prolonged, the efficiency is low, and the power supply of the main transformer is influenced. Although some transformer substations can realize remote control switching-on and switching-off operation of the neutral point grounding disconnecting link of the transformer, the actual situation of an operation site cannot be mastered timely, and the accuracy, safety, reliability and quality of the operation cannot be guaranteed, so that the accuracy of the power-on and power-off operation of the main transformer neutral point grounding disconnecting link is guaranteed, misoperation accidents are prevented, switching-off operation efficiency is improved, and the technical problem that a person in the field needs to overcome is solved.
Disclosure of Invention
The application provides a main transformer neutral point earthing knife-switch remote control circuit to solve the main transformer divide-shut brake operation among the prior art, need the scene to carry out the combined floodgate and the divide-shut brake operation of neutral point earthing knife-switch, degree of automation is low, and the operation accuracy is poor, problem that fail safe nature is low.
In order to solve the technical problems, the embodiment of the application discloses the following technical scheme:
a main transformer neutral point grounding knife switch remote control circuit, comprising: the switching-on branch road with the branch road parallel connection that breaks brake, switching-on branch road and branch road jointly are provided with low pressure air switch, switch remote control clamp plate and distant place change over switch on spot, wherein: the switching-on branch and the switching-off branch are electrically connected with an alternating current power supply through the low-voltage air switch, and the low-voltage air switch is used for controlling the connection and disconnection of the power supply; the switching-on branch is provided with a remote control switching-on relay normally-open contact, the switching-off branch is provided with a remote control switching-off relay normally-open contact, the remote control switching-on relay normally-open contact is respectively connected with one ends of the switching-on branch and the disconnecting link remote control pressing plate, and the remote control switching-off relay normally-open contact is respectively connected with one ends of the switching-off branch and the disconnecting link remote control pressing plate; the other end of the knife switch remote control pressing plate is electrically connected with a zero line N of the low-voltage air switch through a contact point at a remote position of the remote on-site transfer switch.
Preferably, the switching-on branch is provided with a switching-on limit switch, a normally closed contact of a switching-off contactor, a switching-on contactor coil, a normally open self-holding contact of the switching-on contactor and a switching-on button, one end of the switching-on limit switch is electrically connected with a live wire L of the low-voltage air switch, two ends of the normally closed contact of the switching-off contactor are respectively electrically connected with the other end of the switching-on limit switch and one end of the switching-on contactor coil, two ends of the normally open self-holding contact of the switching-on contactor are respectively electrically connected with the other end of the switching-on contactor coil and a zero line N of the air switch, one end of the switching-on button is electrically connected with one end of a local position of the remote local change-over switch.
Preferably, the brake separating branch is provided with a brake separating limit switch, a brake closing contactor normally-closed contact, a brake separating contactor coil, a brake separating contactor normally-open self-holding contact and a brake separating button, one end of the brake separating limit switch is electrically connected with a live wire L of the low-voltage air switch, two ends of the brake closing contactor normally-closed contact are respectively electrically connected with the other end of the brake separating limit switch and one end of the brake separating contactor coil, two ends of the brake separating contactor normally-open self-holding contact are respectively electrically connected with the other end of the brake separating contactor coil and a zero line N of the air switch, one end of the brake separating button is electrically connected with the other end of the brake separating contactor coil, and the other end of the brake separating button is electrically connected with one end of a remote place of the local transfer switch.
Preferably, the switching-on branch and the switching-off branch are provided with a switching-on/switching-off shared circuit, one end of the switching-on/switching-off shared circuit is connected with a parallel point of the switching-on branch and the switching-off branch, the parallel point is close to one end of the disconnecting link remote control pressing plate, which is not directly connected with the remote on-site change-over switch, and the other end of the switching-on/switching-off shared circuit is electrically connected with a zero line N of the low-voltage air switch.
Preferably, a stop button and a disconnecting link door limit switch are arranged in the switching-on/off shared circuit, one end of the stop button is respectively electrically connected with the normally open self-holding contact of the switching-on contactor, the normally open self-holding contact of the switching-off contactor and one end of the remote on-site transfer switch which are connected in parallel, and two ends of the disconnecting link door limit switch are respectively electrically connected with the other end of the stop button and a zero line N of the low-voltage air switch.
Preferably, the automatic switching device further comprises a grounding disconnecting link position monitoring circuit, wherein the grounding disconnecting link monitoring circuit comprises a normally open contact of a disconnecting link closing auxiliary switch and a normally open contact of a disconnecting link opening auxiliary switch, a main transformer body measurement and control device, a communication management machine and a background monitoring machine. The communication manager is respectively in communication connection with the main transformer body measurement and control device and the background monitor; and the main transformer body measurement and control device is respectively and electrically connected with the normally open contact of the disconnecting link closing auxiliary switch and the normally open contact of the disconnecting link opening auxiliary switch.
Preferably, the normally open contact of the remote control switch-on relay and the normally open contact of the remote control switch-off relay are arranged inside the main transformer body measurement and control device, and the disconnecting link remote control pressing plate is arranged on a panel of the screen cabinet surface of the measurement and control device where the main transformer body measurement and control device is located.
Preferably, the background monitor is provided with a five-prevention program verification logic control circuit; the background monitor is respectively connected with the microcomputer five-prevention analog screen, the microcomputer five-prevention host computer and the main transformer body measurement and control device in a communication mode.
According to the technical scheme, the remote control circuit for the main transformer neutral point grounding disconnecting link provided by the embodiment of the application comprises: the switching-on branch road with the branch road parallel connection that breaks brake, switching-on branch road and branch road jointly are provided with low pressure air switch, switch remote control clamp plate and distant place change over switch on spot, wherein: the switching-on branch and the switching-off branch are electrically connected with an alternating current power supply through the low-voltage air switch, and the low-voltage air switch is used for controlling the connection and disconnection of the power supply; the switching-on branch is provided with a remote control switching-on relay normally-open contact, the switching-off branch is provided with a remote control switching-off relay normally-open contact, the remote control switching-on relay normally-open contact is respectively connected with one ends of the switching-on branch and the disconnecting link remote control pressing plate, and the remote control switching-off relay normally-open contact is respectively connected with one ends of the switching-off branch and the disconnecting link remote control pressing plate; the other end of the knife switch remote control pressing plate is electrically connected with a zero line N of the low-voltage air switch through the remote on-site change-over switch. Firstly, five-prevention program simulation operation is carried out on a microcomputer five-prevention simulation screen, after five-prevention logic judgment and five-prevention program verification are correct, the operation of remote control switching-on or switching-off of a disconnecting link can be started on a background monitor, and the switching-on of a normally open contact of a remote control switching-off relay or a normally open contact of a remote control switching-on relay is controlled through communication connection of the background monitor and a main transformer body measurement and control device, so that a disconnecting link remote control pressing plate and a disconnecting link remote control switching-on or switching-off circuit where a remote on-site change-over switch is located are respectively switched on, the accuracy and reliability of the main transformer neutral point grounding disconnecting link remote control switching-on and switching-off operation are ensured, the remote control switching-on and switching-off operation saves manpower, the cost is saved, and the operation time is greatly reduced. Meanwhile, the normally open contact of the earthing knife switch closing auxiliary switch or the normally open contact of the knife switch opening auxiliary switch is closed in real time, so that an earthing knife switch monitoring circuit can be respectively connected, real-time monitoring of the switch closing position or the switch opening position of a background monitoring machine is realized, abnormal operation conditions are found, and timely treatment can be realized. The occurrence of the situations of false closing and false opening of the disconnecting link can be effectively prevented, the safety and the reliability of operation and running are improved, and the operation efficiency and the quality are improved.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a remote control circuit for a main transformer neutral point grounding disconnecting link provided by the application;
fig. 2 is a schematic diagram of a main transformer neutral point grounding knife switch position monitoring circuit provided by the application;
fig. 3 is a schematic diagram of a five-prevention program operation control of a background monitor of a main transformer neutral point grounding disconnecting link;
in fig. 1-3, the symbols are represented as:
the device comprises a 1-low-voltage air switch, a 2-disconnecting link remote control pressing plate, a 3-remote on-site transfer switch, a 4-remote control switching-on relay normally-open contact, a 5-remote control switching-off relay normally-open contact, a 6-switching-on limit switch, a 7-switching-off contactor normally-closed contact, an 8-switching-on contactor coil, a 9-switching-on contactor normally-open self-holding contact, a 10-switching-on button, an 11-switching-off limit switch, a 12-switching-on contactor normally-closed contact, a 13-switching-off contactor coil, a 14-switching-off contactor normally-open self-holding contact, a 15-switching-off button, a 16-stop button, a 17-switching-gate door limit switch, a normally-open contact of an 18-switching-on auxiliary switch, a 19-switching-off auxiliary switch normally-open contact, a 20-main transformer body measurement and control device, a 21-communication manager and a 22-background monitor.
Detailed Description
In order to more clearly illustrate the embodiments of the present application, the embodiments of the present application will be described below with reference to the accompanying drawings.
Referring to fig. 1, a schematic structural diagram of a remote control circuit for a main transformer neutral point grounding disconnecting link is provided. As shown in fig. 1, a remote control circuit for a main transformer neutral point grounding disconnecting link provided in an embodiment of the present application includes: the switching-on branch is connected with the switching-off branch in parallel, the switching-on branch and the switching-off branch are provided with a low-voltage air switch 1, a disconnecting link remote control pressing plate 2 and a remote on-site change-over switch 3, the switching-on branch and the switching-off branch are electrically connected with an alternating current power supply through the low-voltage air switch 1, and the low-voltage air switch 1 is used for controlling the switching-on and switching-off of the power supply; the switching-on branch is provided with a remote-control switching-on relay normally-open contact 4, the switching-off branch is provided with a remote-control switching-off relay normally-open contact 5, the remote-control switching-on relay normally-open contact 4 is respectively connected with one ends of the switching-on branch and the disconnecting link remote-control pressing plate 2, and the remote-control switching-off relay normally-open contact 5 is respectively connected with one ends of the switching-off branch and the disconnecting link remote-control pressing plate 2; the other end of the knife switch remote control pressing plate 2 is electrically connected with a zero line N of the low-voltage air switch 1 through a far-position contact point of the remote on-site transfer switch 3.
Specifically, in the main transformer neutral point grounding disconnecting link remote control circuit provided by the embodiment of the application, a closing branch is provided with a closing limit switch 6, a normally closed contact 7 of a disconnecting switch contactor, a closing contactor coil 8, a normally open self-retaining contact 9 of the closing contactor and a closing button 10, one end of the closing limit switch 6 is electrically connected with a live wire L of the low-voltage air switch 1, two ends of the normally closed contact 7 of the disconnecting switch contactor are respectively electrically connected with the other end of the closing limit switch 6 and one end of the closing contactor coil 8, two ends of the normally open self-retaining contact 9 of the closing contactor are respectively electrically connected with the other end of the closing contactor coil 8 and a zero line N of the air switch 1, one end of the closing button 10 is electrically connected with the other end of the closing button 10 is electrically connected with one end of the remote on-site transfer switch 3.
The switching-off branch is provided with a switching-off limit switch 11, a switching-on contactor normally-closed contact 12, a switching-off contactor coil 13, a switching-off contactor normally-open self-holding contact 14 and a switching-off button 15, one end of the switching-off limit switch 11 is electrically connected with a live wire L of the low-voltage air switch 1, two ends of the switching-on contactor normally-closed contact 12 are respectively electrically connected with the other end of the switching-off limit switch 11 and one end of the switching-off contactor coil 13, two ends of the switching-off contactor normally-open self-holding contact 14 are respectively electrically connected with the other end of the switching-off contactor coil 13 and a zero line N of the air switch 1, one end of the switching-off button 15 is electrically connected with the other end of the switching-off button 15 is electrically connected with one end of the remote local change-over switch 3.
In this embodiment of the application, the switch-on branch road with the brake-off branch road is provided with the divide-shut brake common circuit, divide-shut brake common circuit's one end with the switch-on branch road with the parallel point of brake-off branch road is connected, the parallel point is close to switch remote control clamp plate 2 and with the one end that remote on-the-spot change over switch 3 is not direct connection, divide-shut brake common circuit's the other end with low-pressure air switch 1's zero line N electricity is connected. The switching-on/off common circuit is provided with a stop button 16 and a disconnecting link door limit switch 17, one end of the stop button 16 is respectively electrically connected with the normally open self-holding contact 9 of the switching-on contactor, the normally open self-holding contact 14 of the switching-off contactor and one end of the remote on-site transfer switch 3 which are connected in parallel, and two ends of the disconnecting link door limit switch 17 are respectively electrically connected with the other end of the stop button 16 and a zero line N of the low-voltage air switch 1.
Referring to fig. 2, for the schematic diagram of a main transformer neutral point grounding switch position monitoring circuit provided by the application, the grounding switch position monitoring circuit comprises a normally open contact 18 of a switch closing auxiliary switch and a normally open contact 19 of a switch opening auxiliary switch, a main transformer body measurement and control device 20, a communication manager 21 and a background monitor 22.
The communication manager 21 is respectively in communication connection with the main transformer body measurement and control device 20 and the background monitor 22; the main transformer body measurement and control device 20 is electrically connected with a normally open contact 18 of the disconnecting link closing auxiliary switch and a normally open contact 19 of the disconnecting link opening auxiliary switch respectively. The normally open contact 4 of the remote control switch-on relay and the normally open contact 5 of the remote control switch-off relay are arranged inside the main transformer body measurement and control device 20, and the disconnecting link remote control pressing plate 2 is arranged on a panel of a screen cabinet surface of the measurement and control device where the main transformer body measurement and control device is located. The background monitor 22 is respectively connected with the microcomputer five-prevention analog screen, the microcomputer five-prevention host computer and the main transformer body measurement and control device 20 in a communication way.
When the specific disconnecting link is operated, the box door of the grounding disconnecting link operation box for checking the neutral point of the main transformer is closed, and at the moment, the limit switch 17 of the box door of the grounding disconnecting link is closed, so that the remote on-site transfer switch 3 is rotated to a remote position, and the remote contact of the remote on-site transfer switch is closed. Referring to fig. 3, a five-prevention program operation control schematic diagram of a main transformer neutral point grounding disconnecting link background monitor is provided. As shown in fig. 3, an operator firstly performs five-prevention simulation operation on a microcomputer five-prevention simulation screen through the operation program shown in fig. 3, performs simulation operation through five-prevention logic judgment, sequentially clicks an icon of a main transformer neutral point grounding disconnecting link through a mouse, enters a switching value page, clicks a remote control, checks a remote control name, inputs a scheduling number, enters remote control selection and clicks permission remote control, and starts to execute and completes remote control opening and closing operation after checking through the five-prevention program.
When the main transformer high-voltage side circuit breaker is in a closing power transmission state, namely the main transformer is in operation, the microcomputer five-prevention logic program judges that the closing operation of the main transformer neutral point grounding disconnecting link is forbidden to be carried out on the background monitor, and when the main transformer high-voltage side circuit breaker is in opening power failure, the five-prevention logic program judges that the closing operation of the main transformer neutral point grounding disconnecting link can be allowed to be carried out on the background monitor; and meanwhile, only when the main transformer high-voltage side breaker is switched on and transmits power, the microcomputer five-prevention logic program can allow the ground disconnecting link of the main transformer neutral point to be operated in the background monitoring machine. Therefore, only after the correct disconnecting link name and equipment scheduling number are input, the five-prevention logic program judges that the checking is passed, and the switching-on and switching-off operation of the main transformer neutral point grounding disconnecting link can be executed.
When remote-control switching-on operation is selected and clicked, a coil of a remote-control switching-on relay is electrified, a corresponding intermediate relay coil is started to be electrified, finally, a normally open contact 4 of the remote-control switching-on relay in fig. 1 is closed, a switching-on contactor coil 8 is electrified and self-maintained, switching-on operation of a disconnecting link is realized, after the switching-on operation is completed in place, a switching-on limit switch 6 is disconnected, a disconnecting link remote-on control circuit is cut off, meanwhile, a disconnecting link can be seen to be displayed in a switching-on position on a primary electric system diagram of a background monitor, and alarm display is carried out below a screen of the background monitor in a mode of text flashing and loudspeaker sound alarm;
when remote control brake opening operation is selected and clicked, a coil of a remote control relay is electrified, a corresponding intermediate relay coil is started to be electrified, finally, a normally open contact 5 of the remote control brake opening relay in fig. 1 is closed, a brake opening contactor coil 13 is electrified and self-maintained, brake opening operation of a brake is realized, a brake opening limit switch 11 is disconnected after the brake opening operation is completed in place, a brake remote control circuit is cut off, meanwhile, a brake can be seen on a primary electric system diagram of a background monitor to display in a brake opening mode, and alarm display is carried out below a screen of the background monitor in a mode of text flashing and loudspeaker sound alarm.
When the remote control switch-on and remote control switch-off of the disconnecting link are completed, the normally open contact 18 of the auxiliary switch for switch-on of the disconnecting link and the normally open contact 19 of the auxiliary switch for switch-off of the disconnecting link are respectively closed, the direct current power supply is respectively connected with a switch-on position or switch-off position switch-in quantity loop, information such as switch-on position or switch-off position switch-in quantity is transmitted to the communication manager 21 and the background monitor 22 through communication, monitoring indication of the operating position of the disconnecting link is carried out in real time by the background monitor 22, background personnel are conveniently reminded, the information is displayed by the background monitor through text flashing and loudspeaker sound alarm, and audible and visual alarm is stopped after alarm confirmation.
When the background monitors that the disconnecting link is abnormal in the process of switching on or off by the remote control of the main transformer neutral point grounding disconnecting link, a remote emergency stop loop of the remote control disconnecting link can be started and turned on, the control loop of the disconnecting link is cut off, the remote emergency locking of the disconnecting link is completed, and safety accidents are avoided; before the background monitor 22 is put into operation, the information of the opening amount of the switch closing and opening positions is input into the database of the background monitor, and defined and named one by one. And the power supply voltage of the direct current power supply of the disconnecting link position monitoring system circuit system is 220V.
From the above embodiment, it can be seen that, according to the embodiment of the present application, a remote control circuit for a main transformer neutral point grounding switch includes: the switching-on branch road with the branch road parallel connection that breaks brake, switching-on branch road and branch road jointly are provided with low pressure air switch 1, switch remote control clamp plate 2 and distant place change over switch 3, wherein: the switching-on branch circuit and the switching-off branch circuit are electrically connected with an alternating current power supply through the low-voltage air switch 1, and the low-voltage air switch 1 is used for controlling the connection and disconnection of the power supply; the switching-on branch is provided with a remote-control switching-on relay normally-open contact 4, the switching-off branch is provided with a remote-control switching-off relay normally-open contact 5, the remote-control switching-on relay normally-open contact 4 is respectively connected with one ends of the switching-on branch and the disconnecting link remote-control pressing plate 2, and the remote-control switching-off relay normally-open contact 5 is respectively connected with one ends of the switching-off branch and the disconnecting link remote-control pressing plate 2; the other end of the knife switch remote control pressing plate 2 is electrically connected with a zero line N of the low-voltage air switch 1 through a far-position contact point of the remote on-site transfer switch 3. Through five-prevention simulation operation and five-prevention logic judgment of a microcomputer, after five-prevention verification is correct, the operation of remote control opening and closing of a disconnecting link which can be opened on the side of a background monitor 22 is controlled, and the closing of a normally open contact 5 of a remote control opening relay or a normally open contact 4 of a remote control closing relay is controlled through the communication connection of the background monitor 22 and a main transformer body measurement and control device, a disconnecting link remote control closing or opening circuit where a disconnecting link remote control pressing plate 2 and a remote on-site change-over switch 3 are respectively connected, so that the accuracy and reliability of the remote control opening and closing operation of a main transformer neutral point grounding disconnecting link are ensured, the remote control opening and closing operation is labor-saving, the cost is saved, and the operation time is greatly reduced. Meanwhile, the normally open contact 18 of the auxiliary switch for closing the grounding disconnecting link or the normally open contact 19 of the auxiliary switch for opening the disconnecting link are closed in real time, so that the grounding disconnecting link monitoring circuit can be respectively connected, the real-time monitoring of the closing position or the opening position of the disconnecting link by the background monitoring machine 22 is realized, abnormal conditions are found, and the abnormal conditions can be treated in time. The occurrence of false opening and closing of the disconnecting link can be effectively prevented, the safety and reliability of operation and running are improved, and the operation efficiency and quality are improved.
The embodiments of the present invention described above do not limit the scope of the present invention.

Claims (8)

1. A main transformer neutral point grounding knife switch remote control circuit, comprising: the switching-on branch circuit with the branch circuit parallel connection that breaks brake, its characterized in that, switching-on branch circuit and branch circuit jointly are provided with low-pressure air switch (1), switch remote control clamp plate (2) and distant place change over switch (3), wherein: the switching-on branch circuit and the switching-off branch circuit are electrically connected with an alternating current power supply through the low-voltage air switch (1), and the low-voltage air switch (1) is used for controlling the connection and disconnection of the power supply;
the switching-on branch is provided with a remote-control switching-on relay normally-open contact (4), the switching-off branch is provided with a remote-control switching-off relay normally-open contact (5), the remote-control switching-on relay normally-open contact (4) is respectively connected with one ends of the switching-on branch and the disconnecting link remote-control pressing plate (2), and the remote-control switching-off relay normally-open contact (5) is respectively connected with one ends of the switching-off branch and the disconnecting link remote-control pressing plate (2);
the other end of the disconnecting link remote control pressing plate (2) is electrically connected with a zero line N of the low-voltage air switch (1) through a far-position contact point of the remote on-site transfer switch (3).
2. The main transformer neutral point grounding disconnecting link remote control circuit according to claim 1, wherein the switching-on branch is provided with a switching-on limit switch (6), a switching-off contactor normally closed contact (7), a switching-on contactor coil (8), a switching-on contactor normally open self-holding contact (9) and a switching-on button (10), one end of the switching-on limit switch (6) is electrically connected with a live wire L of the low-voltage air switch (1), two ends of the switching-off contactor normally closed contact (7) are electrically connected with the other end of the switching-on limit switch (6) and one end of the switching-on contactor coil (8) respectively, two ends of the switching-on contactor normally open self-holding contact (9) are electrically connected with the other end of the switching-on contactor coil (8) and a zero line N of the air switch (1) respectively, one end of the switching-on button (10) is electrically connected with the other end of the remote on-site switch (3).
3. The main transformer neutral point grounding disconnecting link remote control circuit according to claim 2, wherein the disconnecting link branch is provided with a disconnecting limit switch (11), a closing contactor normally closed contact (12), a disconnecting contactor coil (13), a disconnecting contactor normally open self-holding contact (14) and a disconnecting button (15), one end of the disconnecting limit switch (11) is electrically connected with a live wire L of the low-voltage air switch (1), two ends of the closing contactor normally closed contact (12) are electrically connected with the other end of the disconnecting limit switch (11) and one end of the disconnecting contactor coil (13) respectively, two ends of the disconnecting contactor normally open self-holding contact (14) are electrically connected with the other end of the disconnecting contactor coil (13) and a zero line N of the air switch (1) respectively, one end of the disconnecting button (15) is electrically connected with the other end of the disconnecting contactor coil (13), and one end of the disconnecting button (15) is electrically connected with one end of the remote local switch (3) respectively.
4. A main transformer neutral point grounding knife switch remote control circuit according to claim 3, characterized in that the switching-on branch and the switching-off branch are provided with a switching-on/switching-off common circuit, one end of the switching-on/switching-off common circuit is connected with a parallel point of the switching-on branch and the switching-off branch, the parallel point is close to one end of the knife switch remote control pressing plate (2) and not directly connected with the remote on-site transfer switch (3), and the other end of the switching-on/switching-off common circuit is electrically connected with a zero line N of the low-voltage air switch (1).
5. The main transformer neutral point grounding disconnecting link remote control circuit according to claim 4, wherein a stop button (16) and a disconnecting link door limit switch (17) are arranged in the switching-on/switching-off common circuit, one end of the stop button (16) is electrically connected with one end of the normally open self-holding contact (9) of the switching-on contactor, one end of the normally open self-holding contact (14) of the switching-off contactor and one end of the remote on-site transfer switch (3) which are connected in parallel, and two ends of the disconnecting link door limit switch (17) are electrically connected with the other end of the stop button (16) and a zero line N of the low-pressure air switch (1) respectively.
6. The main transformer neutral point grounding switch remote control circuit according to any one of claims 1 to 5, further comprising a grounding switch position monitoring circuit, wherein the grounding switch monitoring circuit comprises a normally open contact (18) of a switch closing auxiliary switch and a normally open contact (19) of a switch opening auxiliary switch, a main transformer body measurement and control device (20), a communication manager (21) and a background monitor (22);
the communication manager (21) is respectively in communication connection with the main transformer body measurement and control device (20) and the background monitor (22);
the main transformer body measurement and control device (20) is electrically connected with a normally open contact (18) of the disconnecting link closing auxiliary switch and a normally open contact (19) of the disconnecting link opening auxiliary switch respectively.
7. The main transformer neutral point grounding disconnecting link remote control circuit according to claim 6, wherein the remote control closing relay normally open contact (4) and the remote control opening relay normally open contact (5) are arranged inside the main transformer body measurement and control device (20), and the disconnecting link remote control pressing plate (2) is arranged on a panel of a screen cabinet surface of the measurement and control device where the main transformer body measurement and control device is located.
8. The main transformer neutral point grounding switch remote control circuit according to any one of claims 6 or 7, wherein the background monitor (22) is provided with a five-prevention program verification logic control circuit;
the background monitoring machine (22) is respectively in communication connection with the microcomputer five-prevention simulation screen, the microcomputer five-prevention host machine and the main transformer body measurement and control device (20).
CN201710206285.8A 2017-03-31 2017-03-31 Main transformer neutral point grounding disconnecting link remote control circuit Active CN106787222B (en)

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CN109818420A (en) * 2019-03-26 2019-05-28 国网北京市电力公司 Measuring and controlling equipment and TT&C system
CN110308685B (en) * 2019-07-05 2021-04-13 国家电网有限公司 Electric power overhauls job site monitoring machine
CN111224342A (en) * 2020-03-20 2020-06-02 广西电网有限责任公司防城港供电局 Transformer anti-misoperation topology five-prevention design method based on dispatching automation system
CN112509850B (en) * 2020-11-19 2023-02-10 广东电网有限责任公司 Ground knife electric locking device and circuit interval with same
CN113381507A (en) * 2021-04-30 2021-09-10 国网宁夏电力有限公司检修公司 Isolator control system based on real-time condition diagnosis and multiple anti-misoperation

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