CN115663609A - Voltage switching control device and method with indication locking mode - Google Patents
Voltage switching control device and method with indication locking mode Download PDFInfo
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- CN115663609A CN115663609A CN202211268165.8A CN202211268165A CN115663609A CN 115663609 A CN115663609 A CN 115663609A CN 202211268165 A CN202211268165 A CN 202211268165A CN 115663609 A CN115663609 A CN 115663609A
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Abstract
The invention discloses a voltage switching control device with an indication locking mode and a method thereof.A normally closed contact loop of an isolating switch in a direct current loop is additionally provided with an indicator lamp, and the indicator lamp can be matched with a normally open contact starting loop of the isolating switch to indicate the actual position of the isolating switch in normal operation. Meanwhile, a locking loop is added in an alternating current loop of the double-bus voltage switching device, when the double-bus voltage switching device normally operates, the unicity of the voltage loop can be guaranteed even if the magnetic latching relay and the corresponding contact have problems, when the isolating switch is replaced and the secondary loop is reconnected, even if the normally closed contact of the isolating switch is incorrectly connected, the voltage of the electrified bus cannot return to the power-off bus during power transmission, and the safety is higher.
Description
Technical Field
The invention relates to the technical field of transformer substation circuits, in particular to a voltage switching control device with an indication locking mode and a method.
Background
The 220kV bus in the transformer substation mostly adopts a double-bus wiring mode, partial 110kV and 35kV buses also adopt a double-bus wiring mode, lines or transformers connected to the double buses can be connected to the I bus to run through an isolating switch and can also be connected to the II bus to run, when the I bus is connected to run, a voltage loop of the transformer is necessarily connected to a secondary voltage loop of a voltage transformer used by the I bus, and similarly, when the II bus is connected to run, the voltage loop of the transformer is necessarily connected to a secondary voltage loop of the voltage transformer used by the II bus, and the conversion of the secondary voltage loop is realized through a voltage switching loop.
When the relay used in the voltage switching loop is of a magnetic holding type, after the relay is started, even if a direct-current power supply is lost, the relay can still be in a starting state, and only when the isolating switch is disconnected, the dynamic-breaking auxiliary contact of the isolating switch is closed, the relay returns to the coil for excitation, the relay can return, and the voltage secondary loop can be cut off. When transforming or changing circuit breaker, isolator primary equipment, can carry out secondary circuit's wiring again in the transformer substation, because terminal row wiring is intensive, the condition of wrong position or pneumatics can appear during the wiring, and difficult discovery during the inspection, in 220kV circuit breaker terminal box wiring diagram, the wiring of isolator normally open, normally closed contact is also in the circuit breaker terminal box.
Can carry out the pulling-on test to isolator after isolator secondary circuit wiring is accomplished, when isolator closed, the voltage switching secondary circuit switches on, the pilot lamp lights, can inspect secondary circuit wiring exactness, when isolator pulls open, because there is not corresponding signal, can not ensure the exactness in return circuit, because isolator's dynamic break auxiliary contact wiring position is not corresponding, the pneumatics or not compaction appear, isolator pulls open, actually corresponding voltage secondary circuit does not cut off, when having appeared giving the circuit power transmission in reality or when experimenting another isolator, isolator is closed, electrified busbar voltage makes the power failure maintenance busbar live through voltage switching secondary circuit at once, endanger the personal and equipment safety, cause the time limit for a project delay when serious, bring economic loss.
Referring to fig. 1, a schematic diagram of a conventional substation double-bus connection is shown, and in an example of a line voltage switching secondary circuit, QS11 and QS12 are isolation switches connected to a I bus and a II bus respectively. As shown in fig. 2, 1YQJ4, 1YQJ5, and 1YQJ6 are control dc relays switched to the secondary circuit of the I-segment bus TV1, and 2YQJ4, 2YQJ5, and 2YQJ6 are control dc relays switched to the secondary circuit of the II-segment bus TV 2; when the circuit is connected to the I bus to operate, the QS11 isolating switch is turned on, the normally open auxiliary contact of the I bus isolating switch is closed, the action coils corresponding to the relay groups 1YQJ4, 1YQJ5 and 1YQJ6 are excited, the relay is started, the light emitting diode LD1 is lightened, and meanwhile, the normally open contact of the corresponding relay is connected with the I bus voltage secondary circuit, as shown in fig. 3, the operation of the I bus TV is displayed on a panel of the device. Because 1YQJ4, 1YQJ5, 1YQJ6 are for taking the magnetism to keep the relay, even lose direct current power supply, the relay still can keep in the starting condition, can guarantee the normal operating of alternating current voltage return circuit, when pulling open isolator QS11, its I female isolator's normally open auxiliary contact is opened, LD1 extinguishes, I female isolator normally closed contact is closed, relay 1YQJ4, 1YQJ5, 1YQJ6 return coil excitation, make the relay return, thereby cut off I female voltage alternating current secondary circuit. When the line is connected to the II bus, the working principle of the relay sets 2YQJ4, 2YQJ5 and 2YQJ6 and the corresponding normally-open normally-closed contacts is the same as that of the relay sets 1YQJ4, 1YQJ5 and 1YQJ6. The action principle of the voltage switching secondary circuit of the transformer is the same as that of the circuit.
When new equipment is replaced on the isolating switches QS11 and QS21, and the corresponding secondary circuit connection wires are reconnected, a pull-in test is carried out on the isolating switches to ensure that the isolating switches can act correctly, meanwhile, the correctness of the secondary circuit such as voltage switching and the like is verified through an indicator light, a device panel and the like, when the isolating switches are closed and the voltage switching relay starting circuit is switched on, the light-emitting diodes can be lightened to indicate that the circuit connection wires are correct, and when the isolating switches are pulled out, because no indication signal exists in the relay returning circuit, even if the dynamic breaking auxiliary contact connection wires of the isolating switches are wrong or not compacted, the isolating switches can be pulled out normally, so that a tester cannot determine the correctness of the relay returning circuit connection wires. When the situation occurs, although the isolating switch is already pulled open, the actual alternating voltage loop is not disconnected, the corresponding bus is in a power failure state, if another electrified bus supplies power to the circuit or pulls the isolating switch on, the isolating switch corresponding to the other bus is closed, and the electrified bus voltage enables the power failure bus to be electrified, so that personal and equipment safety is seriously endangered.
Disclosure of Invention
The invention aims to provide a high-safety voltage switching control device with an indication locking mode.
In order to solve the problems, the invention provides a voltage switching control device with an indication locking mode, which comprises a direct current loop and an alternating current loop, wherein the direct current loop comprises a normally open contact starting loop of a first bus isolating switch, a normally closed contact loop of the first bus isolating switch, a normally open contact starting loop of a second bus isolating switch and a normally closed contact loop of the second bus isolating switch;
the first indicator lamp is used for checking the wiring correctness of the secondary circuit where the auxiliary contact is disconnected by the disconnecting switch of the I bus when the secondary circuit corresponding to the I bus disconnecting switch is reconnected; and the second indicator lamp is used for checking the wiring correctness of the secondary circuit where the movable break auxiliary contact of the II female isolating switch is positioned when the II female isolating switch is reconnected corresponding to the secondary circuit.
As a further improvement of the invention, the first indicator light is also used for indicating the actual position of the I female isolating switch in cooperation with the indicator light of the normally open contact starting loop of the I female isolating switch in normal operation.
As a further improvement of the invention, the second indicator light is also used for indicating the actual position of the II female isolating switch in cooperation with the indicator light of the II female isolating switch normally-open contact starting loop in normal operation.
As a further improvement of the present invention, the first indicator light is a light emitting diode.
As a further improvement of the present invention, the second indicator light is a light emitting diode.
The invention also provides a voltage switching control method with an indication locking mode, which is applied to the voltage switching control device with the indication locking mode and comprises the following steps:
when the circuit normally operates, the first indicator lamp and an indicator lamp of a normally open contact starting circuit of the I-bus isolating switch are matched to indicate the actual position of the I-bus isolating switch;
when the I-bus isolating switch is reconnected corresponding to the secondary circuit, the first indicator lamp can check the wiring correctness of the secondary circuit where the I-bus isolating switch is in the dynamic breaking auxiliary contact;
when the second indicator light and the indicator light of the normally open contact starting circuit of the II female isolating switch are in normal operation, the second indicator light and the indicator light of the II female isolating switch normally open contact starting circuit are matched to indicate the actual position of the II female isolating switch;
when the secondary circuit corresponding to the female isolating switch II is reconnected, the second indicator light can check the wiring correctness of the secondary circuit where the movable break auxiliary contact of the female isolating switch II is located.
As a further improvement of the invention, the alternating current circuit comprises a first bus voltage circuit and a second bus voltage circuit, wherein a relay 1JK is arranged in the first bus voltage circuit, a 1JK normally closed contact is arranged in the second bus voltage circuit, a relay 2JK is arranged in the second bus voltage circuit, and a 2JK normally closed contact is arranged in the first bus voltage circuit;
the relay 1JK is used for starting when a corresponding normally-open auxiliary contact in the I bus voltage loop is closed, opening a 1JK normally-closed contact in the II bus voltage loop and cutting off the corresponding voltage of the II bus; the relay 2JK is used for being started when the corresponding normally-open auxiliary contact in the II bus voltage loop is closed, opening the 2JK normally-closed contact in the I bus voltage loop and cutting off the corresponding voltage of the I bus.
As a further improvement of the invention, the relay 1JK and the relay 2JK are arranged on the same phase or on different phases.
As a further improvement of the present invention, the relay 1JK is provided on any phase in the I bus voltage circuit, and the relay 2JK is provided on any phase in the II bus voltage circuit.
The invention also provides a voltage switching control method with an indication locking mode, which is applied to the voltage switching control device with the indication locking mode and comprises the following steps:
when the corresponding normally-open auxiliary contact in the I bus voltage loop is closed, the relay 1JK is started, and the 1JK normally-closed contact in the II bus voltage loop is opened to cut off the corresponding voltage of the II bus;
when the corresponding normally open auxiliary contact in the II bus voltage circuit is closed, the relay 2JK is started, the 2JK normally closed contact in the I bus voltage circuit is opened, and the corresponding voltage of the I bus is cut off.
The invention has the beneficial effects that:
the double-bus voltage switching device and the method of the invention can be matched with the normally open contact starting circuit of the isolating switch to indicate the actual position of the isolating switch by adding the indicating lamp in the normally closed contact circuit of the isolating switch in the direct current circuit during normal operation, and when the primary equipment of the isolating switch needs to be replaced or maintained and the wiring of the corresponding secondary circuit is changed or rewired, the wiring correctness of the secondary circuit where the auxiliary contact is dynamically disconnected by the isolating switch can be timely checked in a main control room, thereby improving the working efficiency.
Meanwhile, a locking loop is added in an alternating current loop of the double-bus voltage switching device, when the double-bus voltage switching device normally operates, even if the magnetic latching relay and the corresponding contact are in a problem, the locking loop can ensure the unicity of the voltage loop, when the isolating switch is replaced and the secondary loop is reconnected, even if the normally closed contact of the isolating switch is incorrectly connected, the voltage of the electrified bus cannot return to the power-off bus during power transmission, the intrinsic safety is improved, and the personal safety, the power grid safety and the equipment safety are ensured.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a conventional substation double bus wiring diagram;
FIG. 2 is a DC loop wiring diagram of a conventional line double-bus voltage switching device;
FIG. 3 is a wiring diagram of an AC loop of a conventional dual bus voltage switching device;
FIG. 4 is a DC loop wiring diagram of a line double-bus voltage switching device according to an embodiment of the present invention;
fig. 5 is a wiring diagram of an ac loop of the dual bus voltage switching device in an embodiment of the present invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
As shown in fig. 4-5, the voltage switching control device with indication lockout mode in the embodiment of the present invention includes a dc circuit and an ac circuit, where the dc circuit includes a normally open contact starting circuit of the I-bus isolating switch, a normally closed contact circuit of the I-bus isolating switch, a normally open contact starting circuit of the II-bus isolating switch, and a normally closed contact circuit of the II-bus isolating switch.
In fig. 4, + KM and-KM are the positive and negative electrodes of the control power supply, GD1 and GD2 are the connection terminals for controlling the positive and negative electrodes of the power supply, and 1Q is a dc air switch for controlling the on/off of the power supply; I. the normally open auxiliary contact and the normally closed auxiliary contact of the female isolating switch II are taken from the auxiliary contacts correspondingly converted during the operation of the isolating switch; LD1, LD2 are light-emitting diodes, instruct to turn on I mother and II mother's voltage secondary circuit to turn on separately; 1YQJ4, 1YQJ5 and 1YQJ6 are control direct current relays switched to a secondary circuit of a section I bus TV1, 2YQJ4, 2YQJ5 and 2YQJ6 are control direct current relays switched to a secondary circuit of a section II bus TV2, and the control direct current relays are all provided with magnetic latching relays, and even if a direct current power supply is lost after starting, the relays can still be kept in a starting state; r is an alternating voltage open loop current-limiting resistor; 1YQJ4, 1YQJ5, 1YQJ6 and 2YQJ4, 2YQJ5, 2YQJ6 are reverse parallel diodes, and the effect prevents that the reverse potential that direct current relay produced when the disconnection from damaging components and parts or causing the influence, and reverse parallel diodes provide a route for the reverse potential, play the guard action. 1YQJ1, 1YQJ2, 1YQJ3 and 2YQJ1, 2YQJ2, 2YQJ3 are common relays, and mainly provide contacts for other loops.
In fig. 5, a630, B630, and C630 are three-phase voltages of the I-bus small bus, L630 is zero-sequence voltage of the I-bus small bus, a640, B630, and C640 are three-phase voltages of the II-bus small bus, L640 is zero-sequence voltage of the II-bus small bus, and a710, B710, C710, and L710 are switched voltages provided for protection, measurement, control, and the like after the devices are switched. 1YQJ4, 1YQJ5, 1YQJ6, 2YQJ4, 2YQJ5 and 2YQJ6 in FIG. 5 are the corresponding normally open contacts of the magnetically held DC relays 1YQJ4, 1YQJ5, 1YQJ6 and 2YQJ4, 2YQJ5 and 2YQJ6 in FIG. 4; 7D1 to 7D15 are all connection terminals.
In this embodiment, a first indicator light is connected to the normally closed contact loop of the I-type female isolating switch, and a second indicator light is connected to the normally closed contact loop of the II-type female isolating switch.
The first indicator light is used for checking the wiring correctness of the secondary circuit where the movable breaking auxiliary contact of the I-bus isolating switch is located when the I-bus isolating switch corresponds to the secondary circuit for rewiring; and the second indicator lamp is used for checking the wiring correctness of the secondary circuit where the movable break auxiliary contact of the II female isolating switch is positioned when the II female isolating switch is reconnected corresponding to the secondary circuit. The efficiency of work is improved. If the pilot lamp is not bright, can check secondary circuit wiring, can not further lead to electrified generating line to return the voltage to the power failure generating line when transmitting power because of the wiring problem, endanger personnel and equipment safety.
Furthermore, the first indicator light is also used for indicating the actual position of the I female isolating switch in cooperation with the indicator light of the I female isolating switch normally open contact starting loop when in normal operation. And the second indicator light is also used for indicating the actual position of the II female isolating switch in cooperation with the indicator light of the II female isolating switch normally-open contact starting loop when the II female isolating switch normally operates.
Optionally, the first indicator light is a light emitting diode LD3 or the like, and the second indicator light is a light emitting diode LD4 or the like.
The invention discloses a voltage switching control method with indication locking mode in another embodiment, which is applied to the voltage switching control device with indication locking mode in the embodiment and comprises the following steps:
when the circuit normally operates, the first indicator lamp and an indicator lamp of a normally open contact starting circuit of the I-bus isolating switch are matched to indicate the actual position of the I-bus isolating switch;
when the I-bus isolating switch is reconnected corresponding to the secondary circuit, the first indicator lamp can check the wiring correctness of the secondary circuit where the I-bus isolating switch is in the dynamic breaking auxiliary contact;
when the second indicator light and the indicator light of the normally open contact starting circuit of the II female isolating switch are in normal operation, the second indicator light and the indicator light of the II female isolating switch normally open contact starting circuit are matched to indicate the actual position of the II female isolating switch;
when the secondary circuit corresponding to the female isolating switch II is reconnected, the second indicating lamp can check the wiring correctness of the secondary circuit where the movable break auxiliary contact of the female isolating switch II is located.
Referring to fig. 5, the ac circuit includes a I bus voltage circuit and a II bus voltage circuit, and in some embodiments, a relay 1JK is disposed in the I bus voltage circuit, a 1JK normally closed contact is disposed in the II bus voltage circuit, a relay 2JK is disposed in the II bus voltage circuit, and a 2JK normally closed contact is disposed in the I bus voltage circuit;
the relay 1JK is used for starting when a corresponding normally open auxiliary contact in the I bus voltage loop is closed, opening a 1JK normally closed contact in the II bus voltage loop and cutting off the corresponding voltage of the II bus; the relay 2JK is used for starting when the corresponding normally-open auxiliary contact in the II bus voltage circuit is closed, opening the 2JK normally-closed contact in the I bus voltage circuit and cutting off the corresponding voltage of the I bus.
The relay 1JK is arranged on any phase in the I bus voltage loop, and the relay 2JK is arranged on any phase in the II bus voltage loop. The functions of corresponding contacts of the magnetic latching relays in the alternating current loop of the double-bus voltage switching device are the same, and the I bus voltage loop and the II bus voltage loop can realize a voltage switching locking loop by only adopting one relay (the locking loop is realized by a relay 1JK and a relay 2JK respectively).
Wherein, relay 1JK and relay 2JK are arranged on the same phase or different phases. When the latching relay is connected to different contact loops in the I and II mother voltage loops, even if the used contact fails, the other contact loop can also achieve the purpose of latching, and the reliability is improved.
The invention discloses a voltage switching control method with an indication locking mode, which is applied to the voltage switching control device with the indication locking mode and comprises the following steps:
when the corresponding normally-open auxiliary contact in the I bus voltage loop is closed, the relay 1JK is started, and the 1JK normally-closed contact in the II bus voltage loop is opened to cut off the corresponding voltage of the II bus;
when the corresponding normally-open auxiliary contact in the II bus voltage circuit is closed, the relay 2JK is started, and the 2JK normally-closed contact in the I bus voltage circuit is opened to cut off the corresponding voltage of the I bus.
The invention adds the indicator light in the isolating switch normally closed contact loop in the double-bus voltage switching device direct current loop, when the isolating switch normally operates, the indicator light can be matched with the isolating switch normally open contact starting loop to indicate the actual position of the isolating switch, when the isolating switch primary equipment needs to be replaced or maintained, and the wiring of the corresponding secondary loop changes or is reconnected, the correctness of the wiring of the secondary loop where the isolating switch dynamic-off auxiliary contact is positioned can be checked in the main control room, and the working efficiency is improved.
According to the invention, the latching loop is added in the alternating current loop of the double-bus voltage switching device, and when the double-bus voltage switching device operates normally, even if the magnetic latching relay and the corresponding contact have problems, the addition of the latching loop can ensure the singleness of the voltage loop, and when the isolating switch is replaced and the secondary loop is reconnected, even if the normally closed contact of the isolating switch is incorrectly connected, the voltage of the charged bus cannot return to the power-off bus during power transmission, so that the intrinsic safety is improved, and the safety of a person, a power grid and equipment is ensured.
The indicating and locking loop is added in the double-bus voltage switching device, so that the double-bus voltage switching device can play a double-guarantee role in normal operation and rewiring of replacement equipment.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. A voltage switching control device with an indication locking mode comprises a direct current loop and an alternating current loop, wherein the direct current loop comprises a normally open contact starting loop of a first bus isolating switch, a normally closed contact loop of the first bus isolating switch, a normally open contact starting loop of a second bus isolating switch and a normally closed contact loop of the second bus isolating switch;
the first indicator lamp is used for checking the wiring correctness of the secondary circuit where the auxiliary contact is disconnected by the disconnecting switch of the I bus when the secondary circuit corresponding to the I bus disconnecting switch is reconnected; and the second indicator lamp is used for checking the wiring correctness of the secondary circuit where the movable break auxiliary contact of the II female isolating switch is positioned when the II female isolating switch is reconnected corresponding to the secondary circuit.
2. The voltage switching control device with indication lockout mode of claim 1, wherein the first indicator light is further configured to cooperate with an indicator light of a normally open contact start loop of the female I isolation switch to indicate an actual position of the female I isolation switch during normal operation.
3. The voltage switching control device with indication lockout mode of claim 1 wherein the second indicator light is further configured to cooperate with an indicator light of a normally open contact start loop of the female II disconnector to indicate the actual position of the female II disconnector during normal operation.
4. The voltage switching control device with indication lockout mode of claim 1, wherein the first indicator light is a light emitting diode.
5. The voltage switching control device with indication of lockout mode of claim 1, wherein said second indicator light is a light emitting diode.
6. A voltage switching control method with indication of lockout mode, applied to the voltage switching control device with indication of lockout mode according to any of claims 1-5, characterized by comprising the following steps:
when the circuit normally operates, the first indicator lamp and an indicator lamp of a normally open contact starting circuit of the I-bus isolating switch are matched to indicate the actual position of the I-bus isolating switch;
when the I-bus isolating switch is reconnected corresponding to the secondary circuit, the first indicator lamp can check the wiring correctness of the secondary circuit where the I-bus isolating switch is in the dynamic breaking auxiliary contact;
when the second indicator light and the indicator light of the normally open contact starting circuit of the II female isolating switch are in normal operation, the second indicator light and the indicator light of the II female isolating switch normally open contact starting circuit are matched to indicate the actual position of the II female isolating switch;
when the secondary circuit corresponding to the female isolating switch II is reconnected, the second indicating lamp can check the wiring correctness of the secondary circuit where the movable break auxiliary contact of the female isolating switch II is located.
7. The voltage switching control device with indication of blocking mode according to claim 1, wherein the ac circuit comprises an I-busbar voltage circuit and a II-busbar voltage circuit, wherein a relay 1JK is arranged in the I-busbar voltage circuit, a 1JK normally closed contact is arranged in the II-busbar voltage circuit, a relay 2JK is arranged in the II-busbar voltage circuit, and a 2JK normally closed contact is arranged in the I-busbar voltage circuit;
the relay 1JK is used for starting when a corresponding normally-open auxiliary contact in the I bus voltage loop is closed, opening a 1JK normally-closed contact in the II bus voltage loop and cutting off the corresponding voltage of the II bus; the relay 2JK is used for starting when the corresponding normally-open auxiliary contact in the II bus voltage circuit is closed, opening the 2JK normally-closed contact in the I bus voltage circuit and cutting off the corresponding voltage of the I bus.
8. The voltage switching control device with indication of latching mode of claim 7, wherein relay 1JK and relay 2JK are disposed on the same phase or different phases.
9. The voltage switching control device with indication of blocking mode according to claim 7, wherein said relay 1JK is provided on any phase in I-bus voltage loop, and said relay 2JK is provided on any phase in II-bus voltage loop.
10. A voltage switching control method with indication of lockout mode, applied to the voltage switching control device with indication of lockout mode as claimed in any one of claims 7-9, characterized by comprising the steps of:
when the corresponding normally-open auxiliary contact in the I bus voltage loop is closed, the relay 1JK is started, and the 1JK normally-closed contact in the II bus voltage loop is opened to cut off the corresponding voltage of the II bus;
when the corresponding normally-open auxiliary contact in the II bus voltage circuit is closed, the relay 2JK is started, and the 2JK normally-closed contact in the I bus voltage circuit is opened to cut off the corresponding voltage of the I bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211268165.8A CN115663609A (en) | 2022-10-17 | 2022-10-17 | Voltage switching control device and method with indication locking mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211268165.8A CN115663609A (en) | 2022-10-17 | 2022-10-17 | Voltage switching control device and method with indication locking mode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115663609A true CN115663609A (en) | 2023-01-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211268165.8A Pending CN115663609A (en) | 2022-10-17 | 2022-10-17 | Voltage switching control device and method with indication locking mode |
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| Country | Link |
|---|---|
| CN (1) | CN115663609A (en) |
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2022
- 2022-10-17 CN CN202211268165.8A patent/CN115663609A/en active Pending
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