CN207184025U - Breaker emergency trip control circuit after dc source all disappears - Google Patents
Breaker emergency trip control circuit after dc source all disappears Download PDFInfo
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- CN207184025U CN207184025U CN201720691812.4U CN201720691812U CN207184025U CN 207184025 U CN207184025 U CN 207184025U CN 201720691812 U CN201720691812 U CN 201720691812U CN 207184025 U CN207184025 U CN 207184025U
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- breaker
- pressure side
- source bus
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Abstract
Breaker emergency trip control circuit after all being disappeared the utility model discloses a kind of dc source, after solving DC supply interruption, the problem of how cutting off faulty equipment.Electromagnetic type voltage relay is respectively connected between the both positive and negative polarity of every section of dc source bus, each section of dc source bus electromagnetic type voltage relay normally closed contact forms one end and the ultracapacitor of series arm after being sequentially connected in series(1)A pole connection, the other end of series arm with and tie-point(B)Connection, high-pressure side circuit breaker trip coil(8), medium voltage side circuit breaker trip coil(10)With low-pressure side circuit breaker trip coil(12)One end after parallel connection is connected to another and tie-point(B)On, high-pressure side circuit breaker trip coil(8), medium voltage side circuit breaker trip coil and low-pressure side circuit breaker trip coil(12)Pass through button after parallel connection(4)With ultracapacitor(1)Another pole connection.It is particularly suitable for field operator to operate with.
Description
Technical field
The present invention relates to after a kind of whole DC supply interruptions when in power plant or transformer station, equipment failure situation
Under, high-pressure side, medium voltage side, low-pressure side breaker emergency trip method, suitable for emergency in power plant or transformer station
Lower use, it effectively prevent breaker and powered and the tripping operation that can not meet an urgent need due to losing dc source, and cause the big face of power supply unit
The major accident of product scaling loss occurs.
Background technology
DC power system in power plant or transformer station is by AC charging cabinet, batteries, dc circuit breaker, direct current
What the part such as bus and fuse was formed, be power plant or control in transformer station, signal, relay protection, automatics and
Emergency lighting etc. provides dc source, in addition, also providing reliable DC power supply for equipment operation.DC power system
Reliable power supply, the safe operation to power plant or transformer station, very important effect is played, be the reliable of substation safety operation
Ensure.In recent years, protection device is not worked there occurs the accident of more cause whole station DC supply interruptions in power network, broke
Road device tripping coil lose dc source power supply and faulty line can not be cut off, ultimately result in occur whole transformer station all or
The major accident that equipment component burns, not only make power supply enterprise by huge economic loss, and also bring to certain customers
Huge loss, or even threaten the safe operation of whole power network.
In power plant or transformer station, the failure of DC power system or disconnection, DC supply interruption can be caused, will caused
Breaker can not act, just can not be when transmission line of electricity that power plant or substation bus bar are connected, transformer break down
Excision faulty equipment in the most short time limit, prior art are by behind the power plant or the transmission line of electricity of transformer station being attached thereto
The delay of standby protection, to cut off faulty equipment, or under the instruction of scheduling, relevant device is disconnected, these measures have response
Time is grown, and faulty operation caused by human factor is more, it is impossible to plays a part of urgent danger prevention, can also bring and expand power failure range
Drawback.Therefore, after DC supply interruption in power plant or transformer station, how to cut off failure in the case of no dc source and set
It is standby, turn into the urgent need technical barrier to be solved in substation operation.
The content of the invention
Breaker emergency trip control circuit and control method after all being disappeared the present invention relates to a kind of dc source, solve
When the DC supply interruption in power plant or transformer station after, the technology of faulty equipment how is cut off in the case of no dc source
Problem.
The present invention is that solve above technical problem by the following technical programs:
Breaker emergency trip control circuit after a kind of dc source all disappears, including the high-pressure side open circuit in transformer station
Device breaking coil, the auxiliary contact of high-pressure side breaker first, the auxiliary contact of high-pressure side breaker second, medium voltage side circuit breaker trip
Coil, the auxiliary contact of medium voltage side breaker first, the auxiliary contact of medium voltage side breaker second, low-pressure side circuit breaker trip coil,
The auxiliary contact of low-pressure side breaker first, the auxiliary contact of low-pressure side breaker second;Dc source mother is provided with transformer station
Line, dc source bus electromagnetic type voltage relay, dc source bus are connected between the both positive and negative polarity of dc source bus
One end of electromagnetic type voltage relay normally closed contact and a pole of ultracapacitor link together, dc source bus electromagnetism
The other end of type voltage relay normally closed contact together with Node connectedness in parallel, think highly of by transformer pressure deenergized contact, transformation
Form switch in parallel branch road after Buchholz relay contact and button parallel connection, one end of switch in parallel branch road and ultracapacitor it is another
One pole links together, and the other end of switch in parallel branch road is together with another Node connectedness in parallel;High-pressure side breaker is jumped
One end of brake cable circle is by the way that together with another Node connectedness in parallel, high-pressure side is breaking after the auxiliary contact of high-pressure side breaker first
The other end of device breaking coil by after the auxiliary contact of high-pressure side breaker second together with Node connectedness in parallel;Medium voltage side breaks
One end of road device breaking coil by after the auxiliary contact of medium voltage side breaker first together with another Node connectedness in parallel, middle pressure
The other end of side circuit breaker trip coil by after the auxiliary contact of medium voltage side breaker second together with Node connectedness in parallel;It is low
Press side circuit breaker trip coil one end by after the auxiliary contact of low-pressure side breaker first with another Node connectedness in parallel one
Rise, the other end of low-pressure side circuit breaker trip coil after the auxiliary contact of low-pressure side breaker second with Node connectedness in parallel by existing
Together.
High-pressure side current-limiting resistance is provided between another and tie-point and the auxiliary contact of high-pressure side breaker first;Another
In the lump medium voltage side current-limiting resistance is provided between tie-point and the auxiliary contact of medium voltage side breaker first;Another and tie-point with
Low-pressure side current-limiting resistance is provided between the auxiliary contact of low-pressure side breaker first.
It is provided with transformer station by first paragraph dc source bus, second segment dc source bus, until N section direct currents
Multigroup dc source bus of power source bus composition, it is straight between the both positive and negative polarity of first paragraph dc source bus to be connected with first paragraph
Power source bus electromagnetic type voltage relay is flowed, second segment direct current is connected between the both positive and negative polarity of second segment dc source bus
Source bus electromagnetic type voltage relay, until being connected with N sections dc source mother between the both positive and negative polarity of N section dc source buses
Line electromagnetic type voltage relay, first paragraph dc source bus electromagnetic type voltage relay normally closed contact, second segment dc source
Bus electromagnetic type voltage relay normally closed contact, until N sections dc source bus electromagnetic type voltage relay normally closed contact according to
Secondary to be composed in series normally closed contact series arm, one end of normally closed contact series arm and ultracapacitor a pole are connected to one
Rise, the other end of normally closed contact series arm is together with Node connectedness in parallel.
Charging device is connected with the both ends of ultracapacitor.
Above-mentioned all circuit breaker trip coils and dc source bus may also be the part of appliance in power plant.
The control method of breaker emergency trip, comprises the following steps after a kind of dc source all disappears:
The first step, the dc source bus in transformer station being ranked up, first paragraph dc source bus is represented with I,
Two sections of dc source buses represent that by that analogy, N section dc source buses are represented with N with II;
Second step, by first paragraph dc source busbar voltage UIRepresent;By second segment dc source busbar voltage UII
Represent;By that analogy, N sections dc source bus UNRepresent;
3rd step, an electromagnetic type DC voltage relay is respectively mounted on each section of dc source bus, first paragraph is straight
The electromagnetic type DC voltage relay J installed on stream power source busIRepresent, the electromagnetism installed on second segment dc source bus
Type DC voltage relay JIIRepresent, by that analogy, the electromagnetic type DC voltage relay installed on N section dc source buses
Device JNRepresent;
4th step, the transformer in transformer station will be ranked up, First transformer is represented with T1;By second transformation
Device is represented with T2;By that analogy, M platforms transformer is represented with TM;Corresponded in control room according to the installation of transformer number of units
Button, by the button AN of First transformerT1Represent, the button AN of second transformerT2Represent, by that analogy, the
The button AN of M platform transformersTMRepresent;
The electromagnetic type DC voltage relay J installed in 5th step, the 3rd step on first paragraph dc source busIIt is normally closed
Contact JIT1、JIT2…JITMRepresent, the electromagnetic type DC voltage relay J installed on second segment dc source busIIIt is normally closed
Contact JIIT1、JIIT2…JIITMRepresent, the electromagnetic type DC voltage relay J installed on N section dc source busesN
Normally closed contact JNT1、JNT2…JNTMRepresent
6th step, obtain the voltage setting valve U that dc source bus power supply disappearsZL, all dc source bus section, busbar section power supplys
The setting valve of disappearance is identical;
7th step, the electromagnetic type DC voltage relay installed on each section of dc source bus obtain according to the 6th step
Setting valve UZLAdjusted;The normally closed contact number of relay should be identical with the transformer number of whole transformer station;Dc source electricity
When positive pressure is normal, the actuating of relay, normally closed contact is opened;
8th step, in transformer station according to every transformer configuration ultracapacitor one;Ultracapacitor should be arranged on
Near breaker, the capacity of ultracapacitor should meet that each side whole breaker of the transformer being capable of reliable trip simultaneously;
Discharge is connected with ultracapacitor;
9th step, as first paragraph dc source busbar voltage UI≦UZL, the electromagnetism installed on first paragraph dc source bus
Type DC voltage relay JILose dc source, the electromagnetic type DC voltage relay installed on first paragraph dc source bus
JINormally closed contact JIT1、JIT2…JITMClosure;
Start no to second segment dc source bus dead electricity to differentiate:
If UII>UZL, the electromagnetic type DC voltage relay J that installs on second segment dc source busIIDo not lose straight
Flow power supply, the electromagnetic type DC voltage relay J installed on second segment dc source busIINormally closed contact JIIT1、JIIT2…
JIITMDo not close, terminate and differentiate that losing for other bus dc sources is no;
If UII≦UZ, the electromagnetic type DC voltage relay J that installs on second segment dc source busIILose direct current
Source, the electromagnetic type DC voltage relay J installed on second segment dc source busIINormally closed contact JIIT1、JIIT2…JIITMClose
Close;
Start no to the 3rd section of dc source bus dead electricity to differentiate again;
By that analogy, until being differentiated N section dc source bus dead electricity is no;If whole dc sources in transformer station
When being in vanishing state, then, and the electromagnetic type DC voltage on first paragraph dc source bus I to N section dc source buses
The contact of relay is all in closure state;
Tenth step, closed by Transformer Heavy Gas relay or pressure deenergized contact, connect the super of the transformer
Capacitor, using ultracapacitor, all voltage levels direct current buses, electromagnetically DC voltage relay contact, transformation are thought highly of watt
This relay or each side breaker closing auxiliary contact of pressure deenergized contact, current-limiting resistance, transformer and each side of transformer are broken
The loop that road device breaking coil is formed, is circuit breaker trip coil power supply, reaches the purpose for disconnecting each side breaker of the transformer;
Also can be by pressing button, electromagnetically DC voltage relay contact, the change of button, all voltage levels direct current buses
Depressor grave gas relay or each side breaker closing auxiliary contact of pressure deenergized contact, current-limiting resistance, transformer(Breaker
Connect during combined floodgate, disconnect during breaker open operation)The loop that side circuit breaker trip coil each with transformer is formed, is circuit breaker trip
Coil power supply, reach the purpose for disconnecting each side breaker of the transformer.
The voltage setting valve U that dc bus supply voltage losesZL, obtained according to below equation calculating:
UZL=(0.1-0.3)Un;
Wherein, UnFor dc bus source nominal voltage.
Dc bus power supply and breaker involved by the above method may also be in power plant.
The present invention is power plant, provides a kind of simply and effectively emergency trip side in transformer station after DC supply interruption
Method, is particularly suitable for field operator and operates with, and has ensured the equipment safety of transformer station well.
Brief description of the drawings
Fig. 1 is wiring schematic diagram of the present invention in transformer substation system.
Embodiment
Below according to accompanying drawing, the present invention is described in detail:
Breaker emergency trip control circuit after a kind of dc source all disappears, including the high-pressure side open circuit in transformer station
Device breaking coil 8, the first auxiliary contact of high-pressure side breaker 7, the second auxiliary contact of high-pressure side breaker 24, medium voltage side breaker
Breaking coil 10, the first auxiliary contact of medium voltage side breaker 9, the second auxiliary contact of medium voltage side breaker 25, low-pressure side breaker
Breaking coil 12, the first auxiliary contact of low-pressure side breaker 11, the second auxiliary contact of low-pressure side breaker 26;Set in transformer station
Dc source bus is equipped with, dc source bus electromagnetic type voltage relay is connected between the both positive and negative polarity of dc source bus
Device, one end and a pole of ultracapacitor 1 of dc source bus electromagnetic type voltage relay normally closed contact link together,
The other end of dc source bus electromagnetic type voltage relay normally closed contact links together with simultaneously tie-point B, transformer pressure
Switch in parallel branch road is formed after deenergized contact 2, Transformer Heavy Gas relay tip 3 and the parallel connection of button 4, switch in parallel branch road
One end and another pole of ultracapacitor 1 are linked together, and the other end of switch in parallel branch road is connected with another and tie-point A
Together;One end of high-pressure side circuit breaker trip coil 8 by after the first auxiliary contact of high-pressure side breaker 7 with it is another and be coupled
Point A links together, the other end of high-pressure side circuit breaker trip coil 8 by after the second auxiliary contact of high-pressure side breaker 24 with
And tie-point B links together;One end of medium voltage side circuit breaker trip coil 10 passes through the first auxiliary contact of medium voltage side breaker 9
Linked together afterwards with another and tie-point A, the other end of medium voltage side circuit breaker trip coil 10 passes through medium voltage side breaker
Linked together after two auxiliary contacts 25 with simultaneously tie-point B;Broken by low-pressure side one end of low-pressure side circuit breaker trip coil 12
Linked together after the first auxiliary contact of road device 11 with another and tie-point A, the other end of low-pressure side circuit breaker trip coil 12
By being linked together after the second auxiliary contact of low-pressure side breaker 26 with simultaneously tie-point B.
Above-mentioned all circuit breaker trip coils and dc source bus may also be the part of appliance in power plant.
The control method of breaker emergency trip, comprises the following steps after a kind of dc source all disappears:
The first step, the dc source bus in transformer station being ranked up, first paragraph dc source bus is represented with I,
Two sections of dc source buses represent that by that analogy, N section dc source buses are represented with N with II;
Second step, by first paragraph dc source busbar voltage UIRepresent;By second segment dc source busbar voltage UII
Represent;By that analogy, N sections dc source bus UNRepresent;
3rd step, an electromagnetic type DC voltage relay is respectively mounted on each section of dc source bus, first paragraph is straight
The electromagnetic type DC voltage relay J installed on stream power source busIRepresent, the electromagnetism installed on second segment dc source bus
Type DC voltage relay JIIRepresent, by that analogy, the electromagnetic type DC voltage relay installed on N section dc source buses
Device JNRepresent;
4th step, the transformer in transformer station will be ranked up, First transformer is represented with T1;By second transformation
Device is represented with T2;By that analogy, M platforms transformer is represented with TM;Corresponded in control room according to the installation of transformer number of units
Button, by the button AN of First transformerT1Represent, the button AN of second transformerT2Represent, by that analogy, the
The button AN of M platform transformersTMRepresent;
The electromagnetic type DC voltage relay J installed in 5th step, the 3rd step on first paragraph dc source busIIt is normally closed
Contact JIT1、JIT2…JITMRepresent, the electromagnetic type DC voltage relay J installed on second segment dc source busIIIt is normally closed
Contact JIIT1、JIIT2…JIITMRepresent, the electromagnetic type DC voltage relay J installed on N section dc source busesN
Normally closed contact JNT1、JNT2…JNTMRepresent
6th step, obtain the voltage setting valve U that dc source bus power supply disappearsZL, all dc source bus section, busbar section power supplys
The setting valve of disappearance is identical;
7th step, the electromagnetic type DC voltage relay installed on each section of dc source bus obtain according to the 6th step
Setting valve UZLAdjusted;The normally closed contact number of relay should be identical with the transformer number of whole transformer station;Dc source electricity
When positive pressure is normal(Generation current factory, transforming plant DC busbar voltage are generally 220V or 110V), the actuating of relay is normally closed to connect
Point is opened;
8th step, in transformer station according to every transformer configuration ultracapacitor 1 one;Ultracapacitor 1 should be installed
Near breaker, the capacity of ultracapacitor should meet that each side whole breaker of the transformer being capable of reliable trip simultaneously;
Discharge 23 is configured with ultracapacitor 1, is charged for ultracapacitor 1;
9th step, as first paragraph dc source busbar voltage UI≦UZL, the electromagnetism installed on first paragraph dc source bus
Type DC voltage relay JILose dc source, the electromagnetic type DC voltage relay installed on first paragraph dc source bus
JINormally closed contact JIT1、JIT2…JITMClosure;
Start no to second segment dc source bus dead electricity to differentiate:
If UII>UZL, the electromagnetic type DC voltage relay J that installs on second segment dc source busIIDo not lose straight
Flow power supply, the electromagnetic type DC voltage relay J installed on second segment dc source busIINormally closed contact JIIT1、JIIT2…
JIITMDo not close, terminate and differentiate that losing for other bus dc sources is no;
If UII≦UZ, the electromagnetic type DC voltage relay J that installs on second segment dc source busIILose direct current
Source, the electromagnetic type DC voltage relay J installed on second segment dc source busIINormally closed contact JIIT1、JIIT2…JIITMClose
Close;
Start no to the 3rd section of dc source bus dead electricity to differentiate again;
By that analogy, until being differentiated N section dc source bus dead electricity is no;If whole dc sources in transformer station
When being in vanishing state, then, and the electromagnetic type DC voltage on first paragraph dc source bus I to N section dc source buses
The contact of relay is all in closure state;
Tenth step, closed by Transformer Heavy Gas relay or pressure deenergized contact, connect the super of the transformer
Capacitor 1, using ultracapacitor 1, all voltage levels direct current buses, electromagnetically DC voltage relay contact, transformation are thought highly of
Buchholz relay or each side breaker closing auxiliary contact of pressure deenergized contact, current-limiting resistance, transformer(During breaker closing
Connect, disconnect during breaker open operation)The loop that side circuit breaker trip coil each with transformer is formed, supplied for circuit breaker trip coil
Electricity, reach the purpose for disconnecting each side breaker of the transformer;
Also can by pressing button 4, button 4, all voltage levels direct current buses electromagnetically DC voltage relay contact,
Transformer Heavy Gas relay or each side breaker closing auxiliary contact of pressure deenergized contact, current-limiting resistance, transformer(Open circuit
Device is connected when closing a floodgate, and is disconnected during breaker open operation)The loop that side circuit breaker trip coil each with transformer is formed, jumped for breaker
Lock coil power supply, reach the purpose for disconnecting each side breaker of the transformer.
The voltage setting valve U that dc bus supply voltage losesZL, obtained according to below equation calculating:
UZL=(0.1-0.3)Un;
Wherein, UnFor dc bus source nominal voltage.
Dc bus power supply and breaker involved by the above method may also be in power plant.
Claims (4)
- Breaker emergency trip control circuit after 1. a kind of dc source all disappears, including the high-pressure side breaker in transformer station Breaking coil(8), the auxiliary contact of high-pressure side breaker first(7), the auxiliary contact of high-pressure side breaker second(24), medium voltage side breaks Road device breaking coil(10), the auxiliary contact of medium voltage side breaker first(9), the auxiliary contact of medium voltage side breaker second(25), it is low Press side circuit breaker trip coil(12), the auxiliary contact of low-pressure side breaker first(11), the auxiliary contact of low-pressure side breaker second (26);Dc source bus is provided with transformer station, it is characterised in that be connected between the both positive and negative polarity of dc source bus Dc source bus electromagnetic type voltage relay, one end of dc source bus electromagnetic type voltage relay normally closed contact with it is super Capacitor(1)A pole link together, the other end of dc source bus electromagnetic type voltage relay normally closed contact with simultaneously Tie-point(B)Link together, transformer pressure deenergized contact(2), Transformer Heavy Gas relay tip(3)And button(4) Switch in parallel branch road, one end of switch in parallel branch road and ultracapacitor are formed after parallel connection(1)Another pole link together, The other end of switch in parallel branch road and another and tie-point(A)Link together;High-pressure side circuit breaker trip coil(8)One end Pass through the auxiliary contact of high-pressure side breaker first(7)Afterwards with another and tie-point(A)Link together, high-pressure side circuit breaker trip Coil(8)The other end pass through the auxiliary contact of high-pressure side breaker second(24)Afterwards with and tie-point(B)Link together;Middle pressure Side circuit breaker trip coil(10)One end pass through the auxiliary contact of medium voltage side breaker first(9)Afterwards with another and tie-point(A) Link together, medium voltage side circuit breaker trip coil(10)The other end pass through the auxiliary contact of medium voltage side breaker second(25)Afterwards With simultaneously tie-point(B)Link together;Low-pressure side circuit breaker trip coil(12)One end it is auxiliary by low-pressure side breaker first Adjuvant grafting point(11)Afterwards with another and tie-point(A)Link together, low-pressure side circuit breaker trip coil(12)The other end pass through The auxiliary contact of low-pressure side breaker second(26)Afterwards with and tie-point(B)Link together.
- Breaker emergency trip control circuit after 2. a kind of dc source according to claim 1 all disappears, its feature It is, in another and tie-point(A)With the auxiliary contact of high-pressure side breaker first(7)Between be provided with high-pressure side current-limiting resistance (6);In another and tie-point(A)With the auxiliary contact of medium voltage side breaker first(9)Between be provided with medium voltage side current-limiting resistance (5);In another and tie-point(A)With the auxiliary contact of low-pressure side breaker first(11)Between be provided with low-pressure side current-limiting resistance (13).
- Breaker emergency trip control circuit after 3. a kind of dc source according to claim 2 all disappears, its feature It is, is provided with transformer station by first paragraph dc source bus(17), second segment dc source bus(18), until N Section dc source bus(19)Multigroup dc source bus of composition, in first paragraph dc source bus(17)Both positive and negative polarity between It is connected with first paragraph dc source bus electromagnetic type voltage relay(20), in second segment dc source bus(18)Both positive and negative polarity Between be connected with second segment dc source bus electromagnetic type voltage relay(21), until N section dc source buses(19)'s N section dc source bus electromagnetic type voltage relays are connected between both positive and negative polarity(22), first paragraph dc source bus electromagnetism Type voltage relay normally closed contact(16), second segment dc source bus electromagnetic type voltage relay normally closed contact(15), until N section dc source bus electromagnetic type voltage relay normally closed contacts(14)Normally closed contact series arm is sequentially connected in series, often Close one end and the ultracapacitor of contact series arm(1)A pole link together, normally closed contact series arm it is another End and simultaneously tie-point(B)Link together.
- Breaker emergency trip control circuit after 4. a kind of dc source according to claim 2 all disappears, its feature It is, in ultracapacitor(1)Both ends be connected with charging device(23).
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CN201720691812.4U CN207184025U (en) | 2017-06-15 | 2017-06-15 | Breaker emergency trip control circuit after dc source all disappears |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN110504657A (en) * | 2019-07-31 | 2019-11-26 | 宁波天安(集团)股份有限公司 | Middle pressure ring network cabinet power failure tripping device |
CN111819650A (en) * | 2018-06-01 | 2020-10-23 | 株式会社Lg化学 | Latching relay capable of real-time state control, state control method for latching relay, and battery pack including latching relay capable of real-time state control |
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2017
- 2017-06-15 CN CN201720691812.4U patent/CN207184025U/en active Active
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN111819650A (en) * | 2018-06-01 | 2020-10-23 | 株式会社Lg化学 | Latching relay capable of real-time state control, state control method for latching relay, and battery pack including latching relay capable of real-time state control |
EP3703094A4 (en) * | 2018-06-01 | 2021-05-12 | Lg Chem, Ltd. | Latch relay capable of real-time state control, state control method for latch relay, and battery pack comprising latch relay capable of real-time state control |
CN111819650B (en) * | 2018-06-01 | 2023-01-13 | 株式会社Lg新能源 | Latching relay, state control method thereof, and battery pack including latching relay |
US11728115B2 (en) | 2018-06-01 | 2023-08-15 | Lg Energy Solution, Ltd. | Latch relay capable of real-time state control, state control method for latch relay, and battery pack comprising latch relay capable of real-time state control |
CN110504657A (en) * | 2019-07-31 | 2019-11-26 | 宁波天安(集团)股份有限公司 | Middle pressure ring network cabinet power failure tripping device |
CN110504657B (en) * | 2019-07-31 | 2023-12-08 | 宁波天安(集团)股份有限公司 | Medium-voltage ring main unit power-failure tripping device |
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