CN108321682B - Power distribution cabinet interlocking control system and contact cabinet control circuit thereof - Google Patents
Power distribution cabinet interlocking control system and contact cabinet control circuit thereof Download PDFInfo
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- CN108321682B CN108321682B CN201810252931.9A CN201810252931A CN108321682B CN 108321682 B CN108321682 B CN 108321682B CN 201810252931 A CN201810252931 A CN 201810252931A CN 108321682 B CN108321682 B CN 108321682B
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- contactor
- relay
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- branch
- bus
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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
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/20—Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards
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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
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/24—Circuit arrangements for boards or switchyards
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Patch Boards (AREA)
Abstract
The invention relates to a power distribution cabinet interlocking control system and a contact cabinet control circuit thereof, comprising a main loop and a control loop, wherein the main loop comprises a normally open contact of a first contactor and a normally open contact of a second contactor, the control loop comprises a first relay energizing branch, a first contactor energizing branch and a second contactor energizing branch which are connected in parallel, the first relay branch comprises a first relay, a first normally open contact and a second normally open contact which are connected, the first contactor energizing branch comprises a first contactor and a normally closed contact of the first relay which are connected, and the second contactor energizing branch comprises a second contactor and a normally open contact of the first contactor which are connected. The control circuit of the contact cabinet has a simple structure, only needs to be connected with a small amount of cables, reduces the cost of the contact cabinet, and has reliable stability and practicability.
Description
Technical Field
The invention belongs to the technical field of power distribution, and particularly relates to a power distribution cabinet interlocking control system and a contact cabinet control circuit thereof.
Background
The connecting cabinet is applied to the medium-high and low-voltage switch cabinets and is widely applied to real estate and industrial and mining enterprises. In order to avoid bus outage caused by power distribution faults, single bus segments are mostly adopted in power systems. When the single bus is adopted for power supply, the normal power supply interconnection switch is in a switching-off state, and the I-section and II-section incoming wires supply power for respective loads. When the I section main power supply or the II section main power supply fails or fails, the connecting switch is closed to supply power to the two-class load, so that the power supply continuity is ensured.
In the prior art, the Chinese patent with the bulletin number of CN202260153U, namely a low-voltage power distribution two-incoming-line one-bus-connection electric interlocking system, and the Chinese patent with the bulletin number of CN204011150U, namely a low-voltage power distribution cabinet interlocking control system, all propose a contact cabinet for connecting an incoming-line cabinet, and the contact cabinet is complex in structure, more in control cables, higher in cost and poor in reliability.
Disclosure of Invention
The invention aims to provide a power distribution cabinet interlocking control system and a contact cabinet control circuit thereof, which are used for solving the problems of high cost and poor reliability caused by complex cables of the existing contact cabinet structure.
In order to solve the technical problems, the invention provides a contact cabinet control circuit, which comprises the following solutions:
the control circuit comprises a first relay energizing branch, a first contactor energizing branch and a second contactor energizing branch which are connected in parallel, wherein the first relay energizing branch, the first contactor energizing branch and the second contactor energizing branch are all used for connecting the positive electrode and the negative electrode of a first bus voltage and the positive electrode and the negative electrode of a second bus voltage, and the first bus and the second bus are two sections of buses used for connection through the connecting cabinet;
the first relay energizing branch circuit comprises a first relay, a first normally open contact and a second normally open contact which are connected, wherein the first normally open contact is a closing point used for closing a circuit breaker in a main incoming cabinet of a first bus, and the second normally open contact is a closing point used for closing the circuit breaker in the main incoming cabinet of a second bus; the first contactor energizing branch circuit comprises a first contactor and a normally closed contact of a first relay which are connected, and the second contactor energizing branch circuit comprises a second contactor and a second normally open contact of the first contactor which are connected.
According to the contact cabinet control circuit, when the first bus and the second bus are in normal operation, the first normally open contact and the second normally open contact are both closed, the first relay power-on branch is conducted, the normally closed contact of the first relay is disconnected, the first contactor power-on branch is not conducted, the normally open contact of the first contactor is not operated, then the second contactor power-on branch is not conducted, and the first normally open contact of the first contactor and the normally open contact of the second contactor in the main circuit are not operated, so that the contact cabinet is in a switching-off state.
When the first bus is powered off and the second bus normally operates, the first normally open contact is not operated, the second normally open contact is closed, so that the first relay energizing branch is not conducted, the normally closed contact of the first relay is not operated, the first contactor energizing branch is conducted, the normally open contact of the first contactor is closed, the second contactor energizing branch is conducted, the first normally open contact of the first contactor and the normally open contact of the second contactor in the main loop are both closed, the contactor is in a closing state, and therefore the second bus is enabled to drive the load operation of the first bus.
When the first bus normally operates and the second bus is powered off, the first normally open contact is closed, the second normally open contact does not act, the first relay power-on branch is not conducted, the first contactor power-on branch and the second contactor power-on branch are conducted, the first normally open contact of the first contactor and the normally open contact of the second contactor in the main loop are both closed, so that the contact is in a closing state, and the load operation that the first bus drives the second bus is realized.
The control circuit of the contact cabinet has a simple structure, only needs to be connected with a small amount of cables, reduces the cost of the contact cabinet, and has reliable stability.
Further, the device also comprises a first indicating circuit used for connecting the anode and the cathode of the first bus voltage and a second indicating circuit used for connecting the anode and the cathode of the second bus voltage, wherein the first indicating circuit and the second indicating circuit are respectively provided with an indicating lamp.
The first indicating circuit is used for indicating the outage condition of the first bus, and the second indicating circuit is used for indicating the outage condition of the second bus.
Further, the control loop also comprises a second relay for connecting the positive electrode and the negative electrode of the first bus voltage or connecting the positive electrode and the negative electrode of the second bus voltage;
when the second relay is used for connecting the positive electrode and the negative electrode of the first bus voltage, the first relay electrifying branch, the first contactor electrifying branch and the second contactor electrifying branch are all used for connecting the positive electrode and the negative electrode of the first bus voltage through normally open contacts of the second relay, and are all used for connecting the positive electrode and the negative electrode of the second bus voltage through normally closed contacts of the second relay.
When the second relay is used for connecting the anode and the cathode of the second bus voltage, the first relay electrifying branch, the first contactor electrifying branch and the second contactor electrifying branch are all used for connecting the anode and the cathode of the second bus voltage through normally open contacts of the second relay, and are all used for connecting the anode and the cathode of the first bus voltage through normally closed contacts of the second relay.
The second relay can be connected with the anode and the cathode of the first bus voltage, and also can be connected with the anode and the cathode of the second bus voltage, when the anode and the cathode of the first bus voltage are connected, if the first bus operates normally, the second relay is conducted, and the normally open contact of the second relay is closed, so that the parallel ports are ensured to be electrified; when the positive electrode and the negative electrode of the second bus voltage are connected, if the second bus operates normally, the second relay is conducted, and the normally open contact of the second relay is closed, so that the parallel ports are ensured to be electrified. The normally open contact and the normally closed contact of the second relay are arranged and used for connecting the parallel ports, and the second relay, the normally open contact and the normally closed contact of the second relay can ensure that the parallel ports are electrified under any condition.
Further, the first contactor energizing branch circuit further comprises a closing switch and a separating switch, and the closing switch is connected with a third normally open contact of the first contactor in parallel.
The switch-on switch is used for being manually closed when the first bus is powered off or the second bus is powered off, the first contactor power-on branch is connected, the third normally open contact of the first contactor is closed, a self-locking passage of the first contactor power-on branch is formed, and power is continuously obtained.
In order to solve the technical problems, the invention also provides a power distribution cabinet interlocking control system, which comprises the following solutions:
the bus contact cabinet comprises a main loop and a control loop, wherein the main loop comprises a first normally open contact of a first contactor and a normally open contact of a second contactor, the control loop comprises a first relay energizing branch, a first contactor energizing branch and a second contactor energizing branch which are connected in parallel, the first relay energizing branch, the first contactor energizing branch and the second contactor energizing branch are all used for connecting an anode and a cathode of a first bus voltage and an anode and a cathode of a second bus voltage, and the first bus and the second bus are two sections of buses which are connected through the contact cabinet;
the first relay energizing branch circuit comprises a first relay, a first normally open contact and a second normally open contact which are connected, wherein the first normally open contact is a closing point used for closing a circuit breaker in a main incoming cabinet of a first bus, and the second normally open contact is a closing point used for closing the circuit breaker in the main incoming cabinet of a second bus; the first contactor energizing branch circuit comprises a first contactor and a normally closed contact of a first relay which are connected, and the second contactor energizing branch circuit comprises a second contactor and a second normally open contact of the first contactor which are connected.
Further, the device also comprises a first indicating circuit used for connecting the anode and the cathode of the first bus voltage and a second indicating circuit used for connecting the anode and the cathode of the second bus voltage, wherein the first indicating circuit and the second indicating circuit are respectively provided with an indicating lamp.
Further, the control loop also comprises a second relay for connecting the positive electrode and the negative electrode of the first bus voltage; the first relay energizing branch, the first contactor energizing branch and the second contactor energizing branch are all used for connecting the anode and the cathode of the first bus voltage through normally open contacts of the second relay, and are all used for connecting the anode and the cathode of the second bus voltage through normally closed contacts of the second relay.
Further, the control loop also comprises a second relay for connecting the positive electrode and the negative electrode of the second bus voltage; the first relay energizing branch, the first contactor energizing branch and the second contactor energizing branch are all used for connecting the anode and the cathode of the second bus voltage through normally open contacts of the second relay, and are all used for connecting the anode and the cathode of the first bus voltage through normally closed contacts of the second relay.
Further, the first contactor energizing branch circuit further comprises a closing switch and a separating switch, and the closing switch is connected with a third normally open contact of the first contactor in parallel.
Drawings
FIG. 1 is a schematic diagram of a control loop of a first tie cabinet control circuit;
FIG. 2 is a schematic diagram of a control loop of a second tie cabinet control circuit;
FIG. 3 is a schematic diagram of the main loop of a tie cabinet control circuit;
fig. 4 is a schematic diagram of a control loop of a third tie cabinet control circuit.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
Embodiment one:
the invention provides a power distribution cabinet interlocking control system which comprises a first bus incoming cabinet, a second bus incoming cabinet and a bus contact cabinet with a control circuit, wherein the control circuit of the contact cabinet comprises a main circuit and a control circuit, the main circuit comprises a normally open contact of a first contactor and a normally open contact of a second contactor, the control circuit is shown in figure 1 and comprises a first relay energizing branch, a first contactor energizing branch and a second contactor energizing branch which are connected in parallel, parallel ports are used for connecting an anode and a cathode of a first bus voltage and also used for connecting an anode and a cathode of a second bus voltage, and the first bus and the second bus are two sections of buses which are connected through the contact cabinet.
The first relay branch comprises a first relay, a first normally open contact and a second normally open contact which are connected, wherein the first normally open contact is a closing point used for closing a circuit breaker in a main incoming cabinet of the first section of bus, and the second normally open contact is a closing point used for closing the circuit breaker in the main incoming cabinet of the second section of bus; the first contactor energizing branch circuit comprises a first contactor and a normally closed contact of a first relay, which are connected, and the second contactor energizing branch circuit comprises a second contactor and a normally open contact of the first contactor, which are connected.
According to the contact cabinet control circuit, when the first bus and the second bus are in normal operation, the first normally open contact and the second normally open contact are both closed, the first relay power-on branch is conducted, the normally closed contact of the first relay is disconnected, the first contactor power-on branch is not conducted, the normally open contact of the first contactor is not operated, then the second contactor power-on branch is not conducted, and the first normally open contact of the first contactor and the normally open contact of the second contactor in the main circuit are not operated, so that the contact cabinet is in a switching-off state.
When the first bus is powered off and the second bus normally operates, the first normally open contact is not operated, the second normally open contact is closed, so that the first relay energizing branch is not conducted, the normally closed contact of the first relay is not operated, the first contactor energizing branch is conducted, the normally open contact of the first contactor is closed, the second contactor energizing branch is conducted, the first normally open contact of the first contactor and the normally open contact of the second contactor in the main loop are both closed, the contactor is in a closing state, and therefore the second bus is enabled to drive the load operation of the first bus.
When the first bus normally operates and the second bus is powered off, the first normally open contact is closed, the second normally open contact does not act, the first relay power-on branch is not conducted, the first contactor power-on branch and the second contactor power-on branch are conducted, the first normally open contact of the first contactor and the normally open contact of the second contactor in the main loop are both closed, so that the contact is in a closing state, and the load operation that the first bus drives the second bus is realized.
The control circuit of the contact cabinet has a simple structure, only needs to be connected with a small amount of cables, reduces the cost of the contact cabinet, and has reliable stability and practicability.
Further, the device also comprises a first indicating circuit used for connecting the anode and the cathode of the first bus voltage and a second indicating circuit used for connecting the anode and the cathode of the second bus voltage, wherein the first indicating circuit and the second indicating circuit are respectively provided with an indicating lamp.
As shown in fig. 2, the first indication circuit is used for indicating the power-off condition of the first bus, and the second indication circuit is used for indicating the power-off condition of the second bus.
Further, the control loop also comprises a second relay for connecting the positive electrode and the negative electrode of the first bus voltage or for connecting the positive electrode and the negative electrode of the second bus voltage.
When the second relay is used for connecting the positive electrode and the negative electrode of the first bus voltage, the parallel ports are used for connecting the positive electrode and the negative electrode of the first bus voltage through normally open contacts of the second relay; when the second relay is used for connecting the positive electrode and the negative electrode of the second bus voltage, the parallel ports are used for connecting the positive electrode and the negative electrode of the second bus voltage through normally open contacts of the second relay.
The second relay can be connected with the positive electrode and the negative electrode of the first bus voltage, and also can be connected with the positive electrode and the negative electrode of the second bus voltage, when the positive electrode and the negative electrode of the first bus voltage are connected, if the first bus operates normally, the second relay is conducted, and the normally open contact of the second relay is closed, so that the parallel ports are ensured to be electrified; when the positive electrode and the negative electrode of the second bus voltage are connected, if the second bus operates normally, the second relay is conducted, and the normally open contact of the second relay is closed, so that the parallel ports are ensured to be electrified.
Further, when the second relay is used for connecting the positive electrode and the negative electrode of the first bus voltage, the parallel port is used for connecting the positive electrode and the negative electrode of the second bus voltage through the normally closed contact of the second relay; when the second relay is used for connecting the positive electrode and the negative electrode of the second bus voltage, the parallel ports are used for connecting the positive electrode and the negative electrode of the first bus voltage through the normally closed contacts of the second relay.
The normally open contact and the normally closed contact of the second relay are arranged and used for connecting the parallel ports, and the second relay, the normally open contact and the normally closed contact of the second relay can ensure that the parallel ports are electrified under any condition.
Further, the first contactor energizing branch circuit further comprises a closing switch and a separating switch, and the closing switch is connected with a third normally open contact of the first contactor in parallel. The switch-on switch is used for being manually closed when the first bus is powered off or the second bus is powered off, the first contactor power-on branch is connected, the third normally open contact of the first contactor is closed, a self-locking passage of the first contactor power-on branch is formed, and power is continuously obtained.
Further, the parallel port is used for connecting the positive electrode and the negative electrode of the first bus voltage through a first fuse, and the parallel port is used for connecting the positive electrode and the negative electrode of the second bus voltage through a second fuse, as shown in fig. 2.
Embodiment two:
the embodiment provides a control circuit of a contact cabinet, which comprises a primary main loop and a secondary control loop, and fig. 3 shows a scheme of operation of a primary main loop single-bus sectionalizer: DL1 represents I section generating line owner inlet wire cabinet, DL2 represents II section generating line owner inlet wire cabinet, I section contact cabinet includes moulded case circuit breaker QF1, contactor KM 1's normally open contact, II section contact cabinet includes moulded case circuit breaker QF2, contactor KM 2's normally open contact, wherein QF1, QF2 are in the normal close state. The upper-stage transformer drives loads of each section to run by DL1 switching-on and DL2 switching-on respectively; when DL1 or DL2 fails or breaks down, the tie switch is required to be switched on to drive the used load to operate.
Fig. 4 shows a principle scheme of the secondary control circuit of the present embodiment: QF1/1, QF1/7 are respectively the positive and negative poles of I section busbar voltage, QF2/1, QF2/7 are respectively the positive and negative poles of II section busbar voltage, relay KA2 is used as dual power relay to control the switching of power, can guarantee circuit 05 electrified under all circumstances.
(1) When the I section DL1 is switched on, the II section DL2 is switched on, the HR1 and HR2 indicator lamps are lighted, the I section bus and the II section bus normally run, the switching-on point (respectively indicated by the broken line boxes of the DL1 and the DL 2) of the DL2 circuit breaker in the loop is changed from the original separated state to the switched-on state, the relay KA1 is powered on, the normally closed contacts KA1 (51 and 52) of the relay KA1 are opened, the circuit cannot be conducted when the switching-on button HA is pressed, the contactor KM1 cannot be powered on, the contactor KM2 cannot be powered on, and the contact cabinet still maintains the switching-off state. This is the normal operating condition of the two-stage circuit.
(2) When the I-section DL1 fault trips, the HR1 indicator light goes out, and the I-section bus is indicated to be powered off. At the moment, a closing button HA is pressed, the HA contacts close a conducting circuit, the contactor KM1 is electrified, the normally open contacts KM1 (13 and 14) of the contactor KM1 are connected with the closing button HA in parallel to continuously conduct electricity from a locking closing circuit, the other pair of normally open contacts KM1 (23 and 24) of the contactor KM1 are connected with a coil of the contactor KM2 in series, the contactor KM2 is electrified, at the moment, a conducting circuit control is formed, and therefore I-section load operation driven by a II-section bus is achieved. When the fault of the section I bus is removed, the loop can be disconnected only by pressing the brake release button TA. When the II-stage DL2 fails, electrification and load operation can be realized in the same way.
The invention realizes the mutual conversion between two power inlet wires by communicating the first contactor KM1 and the second contactor KM 2. When the primary inlet DL1 of the I-section bus is not electrified, the primary inlet DL2 of the II-section bus is electrified, and the I-section load is driven to operate through the closing of the contact cabinet. When the section II bus is not electrified, the section I bus is electrified, and the section II load is driven to operate through the closing of the connecting cabinet. The uninterrupted power supply solves the problem that the operation of important loads is affected because any bus is not electrified, and avoids unnecessary economic loss and influence.
The invention has the advantages that the original contact cabinet has high cost, the control cable is converted into the electric control with economy, applicability, simple control principle and less wiring, and simultaneously, the principles of safe, practical and reliable operation, cost saving and the like are satisfied.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. The control circuit of the contact cabinet is characterized by comprising a main circuit and a control circuit, wherein the main circuit comprises a first normally open contact of a first contactor and a normally open contact of a second contactor, the control circuit comprises a first relay energizing branch, a first contactor energizing branch and a second contactor energizing branch which are connected in parallel, the first relay energizing branch, the first contactor energizing branch and the second contactor energizing branch are all used for connecting an anode and a cathode of a first bus voltage and an anode and a cathode of a second bus voltage, and the first bus and the second bus are two sections of buses used for connection through the contact cabinet;
the first relay energizing branch circuit comprises a first relay, a first normally open contact and a second normally open contact which are connected, wherein the first normally open contact is a closing point used for closing a circuit breaker in a main incoming cabinet of a first bus, and the second normally open contact is a closing point used for closing the circuit breaker in the main incoming cabinet of a second bus; the first contactor energizing branch comprises a first contactor, a normally closed contact of a first relay and a closing switch which are connected, wherein the closing switch is connected with a third normally open contact of the first contactor in parallel, and the closing switch is used for manually closing when the first bus is powered off or the second bus is powered off; the second contactor energizing branch circuit comprises a second contactor and a second normally open contact of the first contactor which are connected.
2. The tie cabinet control circuit of claim 1, further comprising a first indicator circuit for connecting the positive and negative poles of the first bus voltage and a second indicator circuit for connecting the positive and negative poles of the second bus voltage, wherein indicator lamps are disposed in both the first indicator circuit and the second indicator circuit.
3. The tie cabinet control circuit of claim 1, wherein the control loop further comprises a second relay for connecting the positive and negative poles of the first bus voltage; the first relay energizing branch, the first contactor energizing branch and the second contactor energizing branch are all used for connecting the anode and the cathode of the first bus voltage through normally open contacts of the second relay, and are all used for connecting the anode and the cathode of the second bus voltage through normally closed contacts of the second relay.
4. The tie cabinet control circuit of claim 1, wherein the control loop further comprises a second relay for connecting the positive and negative poles of the second bus voltage; the first relay energizing branch, the first contactor energizing branch and the second contactor energizing branch are all used for connecting the anode and the cathode of the second bus voltage through normally open contacts of the second relay, and are all used for connecting the anode and the cathode of the first bus voltage through normally closed contacts of the second relay.
5. The tie cabinet control circuit of claim 1, wherein the first contactor energization branch further comprises a break switch.
6. The utility model provides a switch board interlocking control system, including first busbar inlet wire cabinet, second busbar inlet wire cabinet and busbar tie cabinet, its characterized in that, busbar tie cabinet includes main loop and control loop, main loop includes the first normally open contact of first contactor and the normally open contact of second contactor, control loop includes parallelly connected first relay switch-on branch road, first contactor switch-on branch road, second contactor switch-on branch road, first relay switch-on branch road, first contactor switch-on branch road, second contactor switch-on branch road all are used for connecting the positive negative pole of first busbar voltage and the positive negative pole of second busbar voltage, first busbar and second busbar are through two sections of busbars that the tie cabinet is used for connecting;
the first relay energizing branch circuit comprises a first relay, a first normally open contact and a second normally open contact which are connected, wherein the first normally open contact is a closing point used for closing a circuit breaker in a main incoming cabinet of a first bus, and the second normally open contact is a closing point used for closing the circuit breaker in the main incoming cabinet of a second bus; the first contactor energizing branch comprises a first contactor, a normally closed contact of a first relay and a closing switch which are connected, wherein the closing switch is connected with a third normally open contact of the first contactor in parallel, and the closing switch is used for manually closing when the first bus is powered off or the second bus is powered off; the second contactor energizing branch circuit comprises a second contactor and a second normally open contact of the first contactor which are connected.
7. The power distribution cabinet interlocking control system according to claim 6, further comprising a first indicating circuit for connecting the positive electrode and the negative electrode of the first bus voltage, and a second indicating circuit for connecting the positive electrode and the negative electrode of the second bus voltage, wherein the first indicating circuit and the second indicating circuit are respectively provided with an indicating lamp.
8. The power distribution cabinet interlock control system of claim 6 wherein the control loop further comprises a second relay for connecting the positive and negative poles of the first bus voltage; the first relay energizing branch, the first contactor energizing branch and the second contactor energizing branch are all used for connecting the anode and the cathode of the first bus voltage through normally open contacts of the second relay, and are all used for connecting the anode and the cathode of the second bus voltage through normally closed contacts of the second relay.
9. The power distribution cabinet interlock control system of claim 6 wherein the control loop further comprises a second relay for connecting the positive and negative poles of the second bus voltage; the first relay energizing branch, the first contactor energizing branch and the second contactor energizing branch are all used for connecting the anode and the cathode of the second bus voltage through normally open contacts of the second relay, and are all used for connecting the anode and the cathode of the first bus voltage through normally closed contacts of the second relay.
10. The power distribution cabinet interlock control system of claim 7 wherein the first contactor energizing branch further comprises a break switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810252931.9A CN108321682B (en) | 2018-03-26 | 2018-03-26 | Power distribution cabinet interlocking control system and contact cabinet control circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810252931.9A CN108321682B (en) | 2018-03-26 | 2018-03-26 | Power distribution cabinet interlocking control system and contact cabinet control circuit thereof |
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| CN108321682A CN108321682A (en) | 2018-07-24 |
| CN108321682B true CN108321682B (en) | 2023-09-19 |
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| CN111987751B (en) * | 2020-07-31 | 2023-05-05 | 国网福建省电力有限公司泉州供电公司 | Communication cabinet, communication breaker and operation method of communication breaker |
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| CN205666674U (en) * | 2016-06-06 | 2016-10-26 | 威胜电气有限公司 | Female switching circuit that allies oneself with cabinet control source of low pressure |
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