CN110783124B - Aerify cabinet and keep apart grounding box and control circuit thereof - Google Patents
Aerify cabinet and keep apart grounding box and control circuit thereof Download PDFInfo
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- CN110783124B CN110783124B CN201911057426.XA CN201911057426A CN110783124B CN 110783124 B CN110783124 B CN 110783124B CN 201911057426 A CN201911057426 A CN 201911057426A CN 110783124 B CN110783124 B CN 110783124B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/20—Interlocking, locking, or latching mechanisms
- H01H9/26—Interlocking, locking, or latching mechanisms for interlocking two or more switches
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/20—Interlocking, locking, or latching mechanisms
- H01H9/22—Interlocking, locking, or latching mechanisms for interlocking between casing, cover, or protective shutter and mechanism for operating contacts
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/0354—Gas-insulated switchgear comprising a vacuum switch
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Abstract
The invention provides an isolation grounding box of an inflatable cabinet, which controls the connection and disconnection between a bus and a main circuit and comprises an inflatable switch module, a bus and a grounding switch module, wherein the input end of the inflatable switch module is connected with the bus; the cable junction box module, the input of cable junction box module with the output of aerifing the switch module is connected, the output of cable junction box module inserts the main line, wherein, the cable junction box module includes isolator and earthing switch, isolator control the output of aerifing the switch module with break-make between the main line, wherein, isolator's one end with the output of aerifing the switch module is connected, the main line is inserted to the isolator other end, earthing switch's input inserts on the main line at isolator place. The invention improves the safety performance of the isolation grounding box of the gas-filled cabinet, simplifies the operation steps, facilitates the daily inspection and avoids misoperation and electric shock due to mistaken touch.
Description
Technical Field
The invention relates to the technical field of circuit connection, in particular to an isolated grounding box of an inflatable cabinet and a control circuit thereof.
Background
The 35kV gas-filled cabinet is a special switch cabinet for a wind power generation device, in the prior art, current generated by the wind power generation device is connected into the 35kV gas-filled cabinet through a cable, and the 35kV gas-filled cabinet is used for controlling the on-off of a circuit. 35kV aerifys cabinet mainly comprises the cabinet body, vacuum circuit breaker, three-station switch, cable connection terminal etc. the internal a plurality of air chambers of forming of cabinet are full of SF6 gas, the circuit breaker, three-station switch, components and parts such as cable connection terminal all seal in being full of the gaseous air chamber of SF6, wherein, three-station switch connects the last port at the circuit breaker, therefore, when 35kV main line outage overhauls, need break off the circuit breaker in the 35kV aerifys cabinet earlier, separately turn to the position after with three-station switch again, and close the circuit breaker again, just can form safe ground circuit, cause the outage operating procedure more loaded down with trivial details, lead to maintenance personal maloperation easily.
However, the three-position switch is located at the upper port of the circuit breaker and sealed in the gas charging cabinet, so that a maintenance worker cannot visually check whether the three-position switch is really disconnected or not and is in a grounding position or not, the maintenance worker is easy to go wrong at intervals, the risk of electric shock is caused, and the safety of the maintenance worker is difficult to guarantee.
Disclosure of Invention
The invention mainly aims to provide an isolation grounding box of an inflatable cabinet, aiming at solving the following technical problems:
1) the operation steps are complicated when the main line is powered off and maintained, and misoperation is easily caused. Namely, when the main line is in power failure and maintenance, the breaker QF3 needs to be disconnected firstly, then the three-position switch knife switch QF4 is disconnected and turned to a connected position, and then the breaker QF3 is closed, so that a safe grounding circuit can be formed.
2) Three station switch positions of the 35kV gas-filled cabinet can not be visually checked, and maintenance personnel easily get away from the wrong interval to cause the risk of electric shock. Namely, the three-position switch knife switch QF4 is positioned at the upper port of the breaker QF3 and sealed in the gas-filled cabinet, and a maintenance worker cannot check the real position of the three-position switch knife switch QF4 with naked eyes after the main line is switched from power failure to maintenance.
In order to achieve the above object, the present invention provides an isolated grounding box of an inflatable cabinet, wherein the isolated grounding box of the inflatable cabinet controls the on-off of a line between a bus and a main line, and the isolated grounding box of the inflatable cabinet comprises:
the input end of the inflation switch module is connected with the bus;
the cable connection box module comprises an isolating switch and a grounding switch, the isolating switch controls the connection and disconnection of a circuit between the output end of the inflation switch module and the main circuit, one end of the isolating switch is connected with the output end of the inflation switch module, the other end of the isolating switch is connected into the main circuit, one end of the grounding switch can be connected onto the main circuit where the isolating switch is located, and the other end of the grounding switch is fixedly grounded.
Optionally, the cable junction box module further includes an electrified display device, the working power supply of the electrified display device is derived from the mains supply, and the sensor of the electrified display device is installed on the main line where the isolating switch is located, so that when the main line is electrified, the controller of the electrified display device sends a locking signal to the cabinet door of the cable junction box and the electromagnetic lock of the operating mechanism.
Optionally, the live display device comprises a sensor and a controller, wherein the sensor is used for outputting a live signal to the controller when the main line is live; and the controller is used for displaying an electric signal and disconnecting the working power supply of the electromagnetic locking device when the main circuit is electrified, and locking the cabinet door of the cable connection box and the operating mechanism.
Optionally, the cable junction box module is provided with an electromagnetic locking device, the electromagnetic locking device is used for locking and unlocking a cabinet door of the cable junction box module and the isolation switch operating mechanism, and the controller contact and the circuit breaker auxiliary contact are connected to a power supply loop of the electromagnetic locking device to control on/off of an electromagnetic coil power supply in the electromagnetic locking device.
Optionally, the gas charging switch module comprises a three-position switch and a circuit breaker, wherein the three-position switch comprises an input end and two output ends, one input end is connected with the circuit breaker, one output end of the three-position switch can be connected with the bus, and the other output end can be connected with the ground; and the input end of the breaker is connected with one end of the three-station switch, and the other output end of the breaker is connected with a main line cable.
The application also provides a control loop of the inflatable cabinet isolation grounding box, the control loop of the inflatable cabinet isolation grounding box is used for controlling the on-off of the inflatable cabinet isolation grounding box, and the control loop of the inflatable cabinet isolation grounding box comprises an isolation switch auxiliary contact, a grounding switch auxiliary contact, a switching-on relay, a local switching-on module and a remote switching-on module, wherein the isolation switch auxiliary contact and the grounding switch auxiliary contact are connected in series, the grounding switch auxiliary contact is output and connected with a control power supply cathode, and the input end of the isolation switch auxiliary contact is connected with the output end of the switching-on coil;
the on-site switching-on module and the remote switching-on module are connected in parallel on the input end of the switching-on coil, wherein the on-site switching-on module, the remote switching-on module and the switching-on coil control the on-off of the circuit breaker of the inflatable cabinet isolation grounding box, the auxiliary contact of the isolating switch reacts on-off state of the isolating switch of the inflatable cabinet isolation grounding box, and the auxiliary contact of the grounding switch reacts on-off state of the grounding switch of the inflatable cabinet isolation grounding box.
Optionally, the local switching-on module includes a manual switching-on button and a local transfer switch, the manual switching-on button is connected in series with the local transfer switch, an input end of the local transfer switch is connected to the positive electrode of the control power supply, an output end of the manual switching-on button is connected to an input end of the switching-on coil, and an output end of the switching-on coil is connected to an input end of the auxiliary contact of the isolating switch.
Optionally, the remote closing module comprises a remote closing relay, a trip protection pressing plate and a remote transfer switch which are sequentially connected in series, the input end of the remote transfer switch is connected with the positive electrode of the control power supply, the output end of the closing relay is connected with the input end of the closing coil, and the output end of the closing coil is connected with the input end of the auxiliary contact of the isolating switch.
Optionally, the control circuit of the isolated grounding box of the gas-filled cabinet further comprises a closing coil, an input end of the closing coil is connected with an output end of the on-site closing module and an output end of the remote closing module, and an output end of the closing coil is connected with an input end of the auxiliary contact of the isolating switch.
According to the technical scheme, the cable connecting box module is connected between the output end of the inflation switch module and the main line, and the isolating switch and the grounding switch in the cable connecting box module are used for simplifying the operation steps of power failure maintenance of the main line, facilitating daily inspection and improving the safety use performance of the isolation grounding box of the inflation cabinet.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic view of the exterior surface configuration of the cable connection box of the present invention;
FIG. 2 is a schematic view of the interior of the cable connection cabinet of the present invention in a top down configuration;
FIG. 3 is a schematic view of the internal side view of the cable junction box of the present invention;
FIG. 4 is a schematic electrical circuit diagram of the cable connection module of the present invention;
FIG. 5 is a schematic circuit diagram of the isolated grounding box of the inflatable cabinet of the present invention;
FIG. 6 is a schematic circuit diagram of an electrified display device according to the present invention;
FIG. 7 is a schematic circuit diagram of the control circuit of the electromagnetic locking device of the present invention;
FIG. 8 is a schematic circuit diagram of a control loop of the isolated grounding box of the inflatable cabinet of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) | |
| 1 | |
2 | Cable |
|
| 11 | |
12 | |
|
| 20 | Cable |
21 | |
|
| 22 | Charged |
23 | Insulator | |
| 24 | |
25 | Bus |
|
| 26 | Line side copper bar | | Isolating switch | |
| 31 | On- |
32 | Remote switching-on module | |
| QF2 | Grounding switch | QF3 | Circuit breaker | |
| QF4 | Three-position switch knife switch | QF3:1NC | QF3 normally closed auxiliary contact | |
| DXN | Charged display controller | CG | Sensor with a sensor element | |
| DSN | Electromagnetic locking device | L | Electromagnetic coil | |
| QK1 | Remote transfer switch | QK2 | Local change-over switch | |
| SB1 | Manual closing button | SB2 | Trigger button | |
| LP2 | Trip protection pressure plate | HJ | Remote switching-on relay | |
| HQ | Closing coil | QF1:1NO | QF1 normally open auxiliary contact | |
| QF2:1NC | QF2 normally closed auxiliary contact | DXN:1NC | Normally closed contact of charged display controller |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The 35kV gas-filled cabinet is a special switch cabinet for a wind power generation device, in the prior art, current generated by the wind power generation device is connected into the 35kV gas-filled cabinet through a cable, and the 35kV gas-filled cabinet is used for controlling the on-off of a circuit. The 35kV gas-filled cabinet mainly comprises a cabinet body, a vacuum circuit breaker QF3, a three-position switch knife switch QF4, a cable connection terminal and the like, wherein a plurality of air chambers are formed in the cabinet body and are filled with SF6 gas, and components such as the circuit breaker QF3, the three-position switch knife switch QF4 and the cable connection terminal are all sealed in the air chamber filled with SF6 gas, wherein the three-position switch knife switch QF4 is located at the upper port of the circuit breaker QF3, so that when a 35kV main line is subjected to power failure maintenance, the circuit breaker QF3 needs to be disconnected firstly, then the three-position switch knife switch QF4 needs to be disconnected, namely the three-position switch knife switch QF4 is switched from a position of a busbar copper bar 11 to a position of a grounding copper bar 12, then the circuit breaker QF3 is closed to form a safe grounding circuit, power failure operation steps are complex, and misoperation of maintenance personnel is easily caused.
However, the three-position switch knife switch QF4 is located at the upper port of the breaker QF3 and sealed in the gas-filled cabinet, so that the maintenance personnel cannot visually check the connection state of the three-position switch knife switch QF4 with the busbar copper 11 and the grounding copper 12, the maintenance personnel are prone to walking wrong intervals, the risk of electric shock is caused, and the safety of the maintenance personnel is difficult to guarantee. Therefore, the present application provides an isolation grounding box for an inflatable cabinet, please refer to fig. 1-6, which controls the on/off of a line between buses connected to a main line, wherein the isolation grounding box for an inflatable cabinet comprises an inflation switch module 1 and a cable connection box module 2.
The insulated grounding box of the gas-filled cabinet is suitable for 35kV high voltage electricity and/or 10kV high voltage electricity.
The input end of the inflation switch module 1 is connected with the bus, and the output end of the inflation switch module 1 is connected with the input end of the cable connection box module 2; the improved switch module is characterized in that a vacuum circuit breaker QF3 and a three-position switch knife switch QF4 are arranged in the air inflation switch module 1, the three-position switch knife switch QF4 comprises an input end and two output ends, wherein the input end is connected with the circuit breaker QF3, one output end of the three-position switch knife switch QF4 can be connected with the busbar copper bar 11, and the other output end can be connected with the grounding copper bar 12. The input end of the breaker QF3 is connected with one end of the three-position switch, and the other output end of the breaker QF3 is connected with a main line cable.
The input end of the cable junction box module 2 is connected with the output end of the inflation switch module 1, the output end of the cable junction box module 2 is connected to a main line, the cable junction box module 2 comprises an isolating switch QF1 and a grounding switch QF2, the isolating switch QF1 controls the on-off of the line between the output end of the inflation switch module 1 and the main line, one end of the isolating switch QF1 is connected with the output end of the inflation switch module 1, and the other end of the isolating switch QF1 is connected to the main line; one end of the grounding switch QF2 is fixedly grounded, and the other end of the grounding switch QF2 can be connected to a main circuit where the isolating switch QF1 is located.
When the main line is changed from the operation state to the maintenance state, the breaker QF3 in the air inflation switch module 1 needs to be disconnected, the three-position switch knife switch QF4 needs to be switched from the position of the bus copper bar 11 to the position of the grounding copper bar 12, the isolating switch QF1 in the cable connecting box module 2 needs to be disconnected, the grounding switch QF2 needs to be closed again, the breaker QF3 does not need to be closed again, at the moment, the main line to be maintained can be isolated from the system through the isolating switch QF1 and the grounding switch QF2 in the cable connecting box module 2, an obvious disconnecting point and a reliable grounding point are formed, power failure operation steps of maintenance personnel are simplified, misoperation risks are reduced, and safe operation of the maintenance personnel is guaranteed. In which a mechanical and electrical blocking is provided between the disconnecting switch QF1 and the grounding switch QF2, i.e. to close the grounding switch QF2, the disconnecting switch QF1 must be in the disconnected position.
When the main line is in a transit state from an overhauling state, the grounding switch QF2 in the cable connecting box module 2 needs to be disconnected, then the isolating switch QF1 needs to be closed, then the three-position switch knife switch QF4 in the inflatable switch module 1 needs to be switched to the position of the busbar connecting copper bar 11 from the position of the grounding copper bar 12, and finally the breaker QF3 needs to be closed, so that the busbar is connected to the main line through the inflatable switch module 1 and the cable connecting box module 2. A machine is arranged between the isolating switch QF1 and the grounding switch QF2, and an electric lock is arranged between the breaker QF3 and the isolating switch QF1 and the grounding switch QF2, namely, the breaker QF3 and the grounding switch QF2 are required to be in a brake separating position when the isolating switch QF1 is required to be switched on; to close the grounding switch QF2, the breaker QF3 and the disconnector QF1 must be in the open position; to close the circuit breaker QF3 in the gas-filled switch module 1, the disconnector QF1 must be in the switched-on position and the grounding switch QF2 must be in the switched-off position.
It should be noted that the air charging switch module 1 further includes an air charging switch box, a breaker QF3 and a three-position switch knife switch QF4, wherein the breaker QF3 is installed in the air charging switch box and used for controlling the on-off of a bus output line, the upper port of the breaker QF3 is also installed with the three-position switch knife switch QF4, the input end of the three-position switch knife switch QF4 is connected with the breaker QF3, and the three-position switch knife switch QF4 includes three working positions, which are respectively a working position, a separating position and a grounding position; when the three-position switch knife switch QF4 is located at the working position, the three-position switch knife switch QF4 is connected with the busbar copper bar 11, and when the three-position switch knife switch QF4 is located at the grounding position, the three-position switch knife switch QF4 is switched to the grounding position of the grounding copper bar 12 from the working position of the busbar copper bar 11, so that the safety of the line of the inflatable switch module 1 in power failure maintenance is ensured.
The cable connecting box module 2 further comprises a cable connecting box body 20, an isolating switch QF1, a grounding switch QF2 and an operating mechanism 21 are arranged in the cable connecting box body 20, the circuit of the inflating switch module 1 is connected into the cable connecting box body 20 through a cable, a bus-side copper bar 25 and a circuit-side copper bar 26 are arranged in the cable connecting box body 20, the bus-side copper bar 25 is connected with the inflating switch module 1 through the cable, the circuit-side copper bar 26 is connected with the main circuit through the cable, and the bus-side copper bar 25 and the circuit-side copper bar 26 are fixed on the cable connecting box body 20 through insulators 23; a toughened glass viewing aperture 24 is still installed to cable junction box 20, and the maintainer directly sees isolator QF1 and earthing switch QF2 deciliter state through viewing aperture 24 directly perceived to reduce the maintainer and walk wrong interval, the risk of touching the electric shock by mistake.
The live-line display device 22 is arranged in the cable junction box body 20, a working power supply of the live-line display device is a commercial power supply, the live-line display device 22 comprises a live-line display controller DXN and a sensor CG, the live-line display controller DXN is arranged on a door of the cable junction box body 20, and the sensor CG is arranged in the cable junction box body 20. When the bus side copper bar 25 has electricity in the cable junction box 20, the LED warning lamp lights on the live display controller DXN through the live signal given by the sensor CG to warn the maintainer that the equipment has high voltage electricity, prevent it from walking wrong interval. (please refer to FIG. 6)
The electromagnetic locking device DSN is arranged in the cable junction box body 20, a working power supply of the electromagnetic locking device DSN is a mains supply, the electromagnetic locking device DSN comprises a trigger button SB2, an electromagnetic coil L and a pin shaft, the electromagnetic locking device DSN is arranged on a box door of the cable junction box body 20 and an operating mechanism 21, when a breaker QF3 is switched on and a cable junction box module 2 is electrified, an electrified display controller DXN cuts off the power supply of the electromagnetic locking device DSN, the electromagnetic coil L is powered off, and the pin shaft clamps an operating handle of the box door of the main cable junction box body 20 and the operating mechanism 21 at the moment, so that a maintenance worker is forbidden to open the box door and operate the main cable junction box; when the breaker QF3 separating brake and the cable connection box module 2 are not electrified, the live display controller DXN switches on the power supply of the electromagnetic locking device DSN, the electromagnetic coil L is electrified by pressing the trigger button SB2 at the moment, the electromagnetic lock pin shaft is loosened, the overhaul personnel are allowed to open the box door and operate, the electric locking function of the box door and the operating mechanism 21 is realized, and the purposes of preventing misoperation and preventing accidental electric shock are achieved. (please refer to FIG. 7)
It should be noted that the electromagnetic locking device DSN is composed of a trigger button SB2, an electromagnetic coil L, a pin shaft and a pushing spring, the pin shaft is installed in the center of the electromagnetic coil L, when the working power supply of the electromagnetic locking device DSN is cut off, the electromagnetic coil L loses power, the electromagnetic coil L has no electromagnetic induction stress at this time and cannot adsorb the pin shaft, and the pin shaft is pushed by the spring to clamp the door of the main cable connection box body 20 and the operating handle on the operating mechanism 21; when the work power supply of the electromagnetic locking device DSN is switched on, the electromagnetic coil L is electrified by pressing the trigger button SB2, the electromagnetic coil L generates electromagnetic induction force, the electromagnetic induction force adsorbs the pin shaft and compresses the spring, and the door of the cable connecting box body 20 and the operation handle on the operation mechanism 21 are loosened. The normally closed auxiliary contact QF3:1NC of the circuit breaker reflects the on-off state of the circuit breaker QF3, namely the normally closed auxiliary contact QF3:1NC of the circuit breaker is disconnected when the circuit breaker QF3 is switched on, and the normally closed auxiliary contact QF3:1NC of the circuit breaker is connected when the circuit breaker QF3 is switched off; the normally closed contact DXN:1NC of the electrified display controller reflects whether the bus side copper bar 25 is electrified or not, when the bus side copper bar 25 is electrified, the normally closed contact DXN:1NC of the electrified display controller is disconnected, and when the bus side copper bar 25 is not electrified, the normally closed contact DXN:1NC of the electrified display controller is conducted, so that the electric locking between the circuit breaker QF3 and the isolating switch QF1 is realized. In order to avoid maintenance personal maloperation, improved the security that aerifys cabinet isolation grounding case.
The cable junction box 20 is further provided with an operating mechanism 21, and an inspector can perform opening and closing operations on the disconnecting switch QF1 and the grounding switch QF2 through the operating mechanism 21 and realize a mechanical locking function between the disconnecting switch QF1 and the grounding switch QF2 through the operating mechanism 21. The operating mechanism 21 limits the disconnecting switch QF1 and the grounding switch QF2 from being in the closing state or the opening state at the same time through the lock pin. That is, to close the grounding switch QF2, the disconnecting switch QF1 must be in the disconnected position, and to close the disconnecting switch QF1, the grounding switch QF2 must be in the disconnected position. In order to avoid maintenance personal maloperation, improved the security that aerifys cabinet isolation grounding case.
This embodiment still provides a control circuit of aerifing cabinet isolation grounding box, the control circuit of aerifing cabinet isolation grounding box includes: an isolating switch QF1 normally open auxiliary contact QF1:1NO, a grounding switch QF2 auxiliary contact QF2:1NC, a closing coil HQ, an on-site closing module 31 and a remote closing module 32, the auxiliary contact QF1:1NO of the isolating switch QF1 and the auxiliary contact QF2:1NC of the grounding switch QF2 are connected in series, the grounding switch QF2 auxiliary contact QF2: the output end of the NC is connected with the cathode of the control power supply, the input end of the normally open auxiliary contact QF1:1NO of the isolating switch QF1 is connected with the output end of the closing coil HQ, the local closing module 31 and the remote closing module 32 are connected in parallel to the input of the closing relay HQ, the local closing module 31, the remote closing module 32 and the closing coil HQ control the on-off of the breaker QF3 in the gas-filled switch module 1; the isolating switch QF1 normally-open auxiliary contact QF1:1NO reflects the working state of the isolating switch QF1, namely, the on state and the off state are switched off; the normally closed auxiliary contact QF2:1NC of the grounding switch QF2 reflects the working states of the grounding switch QF2, namely the on state is disconnected and the off state is connected. It should be noted that (as shown in fig. 8), the isolating switch QF1 has a normally open auxiliary contact QF1:1NO indicating that the normally open auxiliary contact QF1:1NO is closed when the isolating switch QF1 is in a closing state, and the grounding switch QF2 has a normally closed auxiliary contact QF2:1NC indicating that the normally closed auxiliary contact QF2:1NO is closed when the grounding switch QF2 is in a breaking state. The isolating switch QF1 normally open auxiliary contact QF1:1NO and the grounding switch QF2 normally closed auxiliary contact QF2:1NC are connected in series and are respectively connected between the output end of the HQ and the negative electrode of the control power supply, so that an electric locking of a closing control loop of the breaker QF3 is realized, namely when the breaker QF3 in the inflatable switch module 1 needs to be closed, the isolating switch QF1 in the cable connection box module 2 needs to be in a closing state and the grounding switch QF2 needs to be in a breaking state, at the moment, the isolating switch QF1 normally open auxiliary contact 1:1NO is closed, the grounding switch QF2 normally closed auxiliary contact QF2:1NC is closed, the negative electrode power supply of the closing coil HQ is switched on, the breaker QF3 is allowed to be closed, misoperation of maintenance personnel is avoided, and the safety of the grounding box of the inflatable cabinet is improved.
The control loop of the insulated grounding box of the gas-filled cabinet further comprises a closing coil HQ, the input end of the closing coil HQ is respectively connected with the on-site closing module 31 and the output end of the remote closing module 32, the output end of the closing coil HQ is connected with the input end of a normally open auxiliary contact QF1:1NO of an isolating switch QF1, and the closing of the remote control circuit breaker QF3 is realized by driving an operating mechanism of the circuit breaker QF3 through an electromagnet of the closing coil HQ.
The on-site switching-on module 31 comprises a manual switching-on button SB1 and an on-site transfer switch QK2, the manual switching-on button SB1 is connected in series with the on-site transfer switch QK2, the input end of the on-site transfer switch QK2 is connected with the positive electrode of a control power supply, and the output end of the manual switching-on button SB1 is connected with the input end of a switching-on coil HQ. The on-site switching-on module 31 is used for an overhaul person to manually switch on the breaker QF3 on site, namely when the breaker QF3 needs to be operated on site, the overhaul person switches the on-site transfer switch QK2 to an on-site position, at the moment, the fourth conduction is carried out, the positive power supply of the switching-on coil HQ is conducted by pressing the manual switching-on button SB1, and therefore the manual switching-on of the breaker QF3 is achieved.
The remote closing module 32 comprises a remote transfer switch QK1, a protective tripping pressure plate LP2 and a remote closing relay HJ which are sequentially connected in series, the input end of the remote transfer switch QK1 is connected with the positive electrode of a control power supply, and the output end of the closing relay HJ is connected with the input end of a closing coil HQ. The remote closing module 32 is used for remotely closing the breaker QF3 by a maintainer, namely when the breaker QF3 needs to be closed remotely, the maintainer switches the remote transfer switch QK1 to a remote position, at the moment, firstly, the breaker is switched on, and the positive power supply of the closing coil HQ is switched on through the closing relay HJ in the external protection device, so that remote closing of the breaker QF3 is realized. The input end of the protection tripping pressing plate LP2 is connected with the output end of a remote transfer switch QK1, the output end of the protection tripping pressing plate LP2 is connected with the input end of a closing coil HQ, and the protection tripping pressing plate LP2 is used for switching on and off the remote control function of the circuit breaker QF 3.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A control loop of an isolation grounding box of an inflatable cabinet is used for controlling the on-off of the isolation grounding box of the inflatable cabinet and is characterized by comprising an isolation switch auxiliary contact, a grounding switch auxiliary contact, a switching-on coil, a local switching-on module and a remote switching-on module, wherein the isolation switch auxiliary contact and the grounding switch auxiliary contact are connected in series, the output of the grounding switch auxiliary contact is connected with the negative electrode of a control power supply, and the input end of the isolation switch auxiliary contact is connected with the output end of the switching-on coil;
the on-site switching-on module and the remote switching-on module are connected in parallel on the input end of the switching-on coil, wherein the on-site switching-on module, the remote switching-on module and the switching-on coil control the on-off of a circuit breaker of the gas insulated cabinet grounding box, the auxiliary contact of the isolating switch reacts the on-off state of the isolating switch of the gas insulated cabinet grounding box, and the auxiliary contact of the grounding switch reacts the on-off state of the grounding switch of the gas insulated cabinet.
2. The control circuit of claim 1, wherein the on-site switching module comprises a manual switching button and an on-site transfer switch, the manual switching button is connected in series with the on-site transfer switch, an input end of the on-site transfer switch is connected to a positive control power supply, an output end of the manual switching button is connected to an input end of the switching coil, and an output end of the switching coil is connected to an input end of an auxiliary contact of the isolation switch.
3. The control circuit of the isolated grounding box of the gas-filled cabinet as claimed in claim 1, wherein the remote switch-on module comprises a remote switch-on relay, a protection trip pressing plate and a remote transfer switch which are sequentially connected in series, the input end of the remote transfer switch is connected with the positive electrode of the control power supply, the output end of the switch-on relay is connected with the input end of the switch-on coil, and the output end of the switch-on coil is connected with the input end of the auxiliary contact of the isolating switch.
4. The control circuit of claim 1, wherein the input terminal of the closing coil is connected to the output terminal of the on-site closing module and the output terminal of the remote closing module, and the output terminal of the closing coil is connected to the input terminal of the auxiliary contact of the disconnecting switch.
5. The control circuit of claim 1, wherein the inflatable cabinet isolation grounding box comprises:
the input end of the inflation switch module is connected with the bus;
the input end of the cable connection box module is connected with the output end of the inflation switch module, the output end of the cable connection box module is connected with a main line, the cable connection box module comprises the isolating switch and the grounding switch, the isolating switch controls the on-off of the line between the output end of the inflation switch module and the main line, one end of the isolating switch is connected with the output end of the inflation switch module, the other end of the isolating switch is connected with the main line, one end of the grounding switch can be thrown into the main line where the isolating switch is located, and the other end of the grounding switch is fixedly grounded.
6. The control circuit of the insulated grounding box of the gas-filled cabinet according to claim 5, wherein the cable connection box module further comprises a live display device, the working power supply of the live display device is derived from the mains supply, and the sensor of the live display device is installed on the main line where the isolating switch is located, so that when the main line is electrified, the controller of the live display device sends a locking signal to the box door of the cable connection box module and the electromagnetic lock of the operating mechanism.
7. The control circuit of the insulated grounding box of the inflatable cabinet as claimed in claim 6, wherein the electrification display device comprises a sensor and a controller, the sensor is used for outputting an electrification signal to the controller when the main line is electrified; and the controller is used for displaying an electric signal and disconnecting the working power supply of the electromagnetic locking device when the main circuit is electrified, and locking the box door and the operating mechanism of the cable connecting box module.
8. The control circuit of the insulated grounding box of the gas-filled cabinet according to claim 6, wherein the cable connection box module is provided with an electromagnetic locking device, the electromagnetic locking device is used for locking and unlocking the box door of the cable connection box module and the operation mechanism of the disconnecting switch, and the controller contact and the auxiliary contact of the circuit breaker are connected into the power circuit of the electromagnetic locking device to control the on-off of the electromagnetic coil power supply in the electromagnetic locking device.
9. The control circuit of the isolated grounding box of the inflatable cabinet as claimed in claim 5, wherein the inflatable switch module comprises a three-position switch and a breaker, the three-position switch comprises an input end and two output ends, wherein one input end is connected with the breaker, one output end of the three-position switch is connected with the bus bar, and the other output end is connected with the ground; the input end of the breaker is connected with one end of the three-position switch, and the other output end of the breaker is connected with a main line cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911057426.XA CN110783124B (en) | 2019-10-31 | 2019-10-31 | Aerify cabinet and keep apart grounding box and control circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911057426.XA CN110783124B (en) | 2019-10-31 | 2019-10-31 | Aerify cabinet and keep apart grounding box and control circuit thereof |
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| CN110783124A CN110783124A (en) | 2020-02-11 |
| CN110783124B true CN110783124B (en) | 2022-04-15 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08315692A (en) * | 1995-05-15 | 1996-11-29 | Hitachi Ltd | Double throw interlock device |
| CN201298491Y (en) * | 2006-05-29 | 2009-08-26 | 西门子公司 | Air insulated power distribution board of a medium-voltage switch device |
| CN108682579A (en) * | 2018-05-23 | 2018-10-19 | 云南电网有限责任公司保山供电局 | A kind of disconnecting switch motor power distant place control method |
-
2019
- 2019-10-31 CN CN201911057426.XA patent/CN110783124B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08315692A (en) * | 1995-05-15 | 1996-11-29 | Hitachi Ltd | Double throw interlock device |
| CN201298491Y (en) * | 2006-05-29 | 2009-08-26 | 西门子公司 | Air insulated power distribution board of a medium-voltage switch device |
| CN108682579A (en) * | 2018-05-23 | 2018-10-19 | 云南电网有限责任公司保山供电局 | A kind of disconnecting switch motor power distant place control method |
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| CN110783124A (en) | 2020-02-11 |
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