CN103426695B - A kind of prevent breaker coil from burning method and device - Google Patents
A kind of prevent breaker coil from burning method and device Download PDFInfo
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- CN103426695B CN103426695B CN201310333512.5A CN201310333512A CN103426695B CN 103426695 B CN103426695 B CN 103426695B CN 201310333512 A CN201310333512 A CN 201310333512A CN 103426695 B CN103426695 B CN 103426695B
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- 230000007246 mechanism Effects 0.000 description 6
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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Abstract
The invention provides a kind of prevent breaker coil from burning method and device, when 35KV and 10KV electric power system is carried out operation and line fault tripping operation or is closed a floodgate, utilize this device can ensure, when starting normal circuit breaker tripping operation or closing circuit, to start 3SJ time delay cutoff circuit simultaneously.Switch normal at 3 second time inner breaker, the automatic loss of excitation of the 3SJ time relay returns, and does not affect circuit breaker and normally runs.After 3 seconds, 3SJ time relay time delay make contact is closed starts 3ZJ auxiliary relay, and 3ZJ break contact is opened, and has 3ZJ break contact cut-off breaker to trip and closing circuit, thus realization minimizing breaker coil burns probability.Direct start-up study cutoff circuit after spy of the present invention sets up and connected by circuit breaker dynamic circuit breaker and make contact, plays the object of protective circuit breaker tripping operation and closing coil.
Description
Technical Field
The invention provides a method for preventing a breaker coil from being burnt, solves the problem of the burnt tripping and closing coils, simultaneously provides a specific device for realizing the method, and belongs to the technical field of protection devices of 35KV and 10KV power systems.
Technical Field
The phenomenon of burning of the tripping and closing coils of the current 35KV and 10KV power system circuit breakers occurs occasionally, and the reason is that the tripping and closing coils of the current circuit breakers are designed according to short-time electrification, and when a tripping electromagnet fault occurs, a tripping mechanism cannot be opened at the top of an iron core; the inner conducting rod and the transmission connecting rod of the circuit breaker body are clamped to cause the iron core to be prevented from opening and closing; when the position of the auxiliary switch is improperly adjusted, the normally open contact and the normally closed contact are closed at the same time; the long-term self-holding of the remote control tripping loop and the like all form that a tripping and closing coil is electrified for a long time to cause the tripping and closing coil of the circuit breaker to be burnt. Once the tripping and closing coil is burnt out, the circuit is powered off, and the consequence that less power transmission and power transmission cannot be carried out in time appears, so that the power supply reliability is greatly influenced, and the improvement measures of the tripping and closing coil of the circuit breaker are effectively strengthened.
Disclosure of Invention
The invention provides a method for preventing a circuit breaker coil from being burnt, which is characterized in that a starting loop and a time delay breaking loop are added in a control loop of an original 35KV and 10KV electric power system when a circuit breaker is in a dynamic break state and a dynamic close contact is closed at the same time, so that the circuit breaker is broken when the circuit breaker cannot be normally tripped or switched on or the position of an auxiliary switch of the circuit breaker is improperly adjusted, and a circuit breaker fault signal is sent out when the circuit breaker is in the dynamic break state and the dynamic close contact is closed at the same time. And further checking the fault of the circuit breaker, and recovering normal operation after the fault is eliminated.
The invention provides a method for preventing a breaker coil from being burnt, which adopts the technical scheme as follows:
the system comprises a closing loop, a tripping loop, an auxiliary contact improper switching starting loop and a time delay disconnecting loop.
When the position of the auxiliary switch of the circuit breaker is improperly adjusted and the phenomenon that the auxiliary switch is broken and the movable contact is closed at the same time occurs, a series circuit formed by the broken contact and the movable contact of the circuit breaker starts a time relay 3KT time delay breaking circuit, after the time delay relay 3KT is excited for 3 seconds, the time delay movable contact is closed, an intermediate relay 3ZJ coil is started, two pairs of broken contacts of the 3ZJ relay are opened, and the tripping and closing circuit of the circuit breaker is disconnected.
The device for realizing the method for preventing the circuit breaker coil from being burnt is characterized in that:
a circuit breaker closing circuit:
when a control switch SA is adopted for switching on or reclosing after a line is tripped, the control switch SA (c) and the SA (b) contact are closed or the reclosing ZHJ1 contact is closed: a closing pulse command is sent to a series circuit consisting of a 3ZJ1 contact, a QF1 contact and an LC coil, so that the closing of the breaker is realized; the 3KT time relay coil is activated.
A circuit breaker trip circuit:
when the control switch SA is adopted for tripping or protection tripping, the control switches SA (sixth) and SA (seventh) contact closing or KOM contact closing: starting an anti-jump relay KCF coil, opening a dynamic breaking contact KCF2 of the anti-jump relay, and disconnecting a closing loop; a tripping pulse command is sent to a series circuit consisting of a 3ZJ2 contact, a QF2 contact and an LT coil, so that the tripping of the circuit breaker is realized; the 3KT coil is started.
A time delay open loop:
when the circuit breaker trips or contracts; a tripping or closing pulse command is sent to a closing loop formed by connecting 3ZJ1, QF1 and LC in series or a tripping loop formed by connecting 3ZJ2, QF2 and LT in series; when the breaker is correctly switched on or tripped (the time for completing the mechanical switching of the switching on and off is normally less than 2 seconds), the voltage division of the 3KT coil by 4R and HWJ or 3R and TWJ is realized, so that the 3KT coil is demagnetized and returned; after the 3KT coil is excited and started, if the tripping and closing switching of the circuit breaker is incorrect within 3 seconds, the moving contact 3KT1 is closed after 3 seconds, the 3ZJ coil is started, and the moving contact 3ZJ1 and 3ZJ2 break the switching-on loop and the tripping loop of the circuit breaker.
Auxiliary contact improper switching circuit
When the breaker trips or closes, when the movable contact and the movable contact are simultaneously connected, the QF3 and the QF4 are both closed, a series circuit consisting of the QF3 and the QF4 starts the 3KT coil, the delay movable contact 3KT1 is closed after 3 seconds to start the 3ZJ coil, and the movable contact of the 3ZJ1 and the 3ZJ2 breaks the closing circuit and the tripping circuit of the breaker. And simultaneously sends out a breaker switching fault signal.
The invention discloses a device for preventing a circuit breaker coil from being burnt, which is characterized in that:
the circuit breaker comprises a breaker closing loop, a breaker tripping loop, a delay breaking loop and an auxiliary contact improper switching loop; wherein,
1) a circuit breaker closing loop:
the relay protection device comprises a circuit breaker control switch SA, a reclosing outlet contact 2HJ1, a tripping contact KCF2 of an anti-jump relay, a tripping contact 3ZJ1 of an intermediate relay, a circuit breaker tripping contact QF1, a circuit breaker closing contactor LC coil, a tripping position relay TWJ coil and a 3R resistor; a contact of a circuit breaker control switch SA is connected with a reclosing contact 2HJ1 in parallel, then is connected with a break contact KCF2 of a jump-proof relay in series and is connected with the positive electrode of a power supply FU and a TWJ coil of a tripping position relay; the break contact 3ZJ1 of the intermediate relay, the break contact QF1 of the circuit breaker and the coil LC of the closing contactor of the circuit breaker are connected in series and are connected with the negative electrode of the power supply FU and the TWJ coil of the trip position relay; the divider resistor 3R is connected with the TWJ coil of the trip position relay in series and then connected with the anode of the power supply FU.
2) A circuit breaker trip loop:
the relay protection device consists of a circuit breaker control switch SA, a protection outlet relay contact KOM, a jump-proof relay KCF coil, a break contact 3ZJ2 of an intermediate relay, a circuit breaker break contact QF2, a circuit breaker tripping coil LT, a switching-on position relay HWJ coil and a 4R resistor; the circuit breaker control switch SA contact and the protection outlet relay contact KOM are connected in parallel, then are connected in series with the anti-jump relay KCF coil and are connected with the positive electrode of the power supply FU and the coil of the switch-on position relay HWJ; the break contact 3ZJ2 of the intermediate relay, the breaker break contact QF2 and the breaker tripping coil LT form a series connection and are connected with the negative pole of the power supply FU and the coil of the switch-on position relay HWJ; the divider resistor 4R is connected with a coil of the switch-on position relay HWJ in series and then is connected with the anode of the power supply FU;
3) and (3) delaying to disconnect a loop:
the time delay mechanism consists of a time relay 3KT coil, a time delay movable contact 3KT1 and an intermediate relay 3ZJ coil; the time relay 3KT coil is connected with the coil of the switch-on position relay HWJ and the negative electrode of the power supply FU, the time relay delay moving switch-on contact 3KT1 is connected with the coil of the intermediate relay 3ZJ in series and then is respectively connected with the positive electrode and the negative electrode of the power supply FU, and the time relay 3KT is provided with 3-second delay;
4) auxiliary contact improper switching loop:
the circuit breaker is formed by connecting a pair of break contacts QF3 and a make contact QF4 in series; the breaker dynamic break contact QF3 and the dynamic close contact QF4 are connected in series and then connected with the power supply positive pole 1 and the coil of the switching-on position relay HWJ.
The working process of the invention is as follows:
when the breaker is switched on or tripped, the other delay disconnecting loop 3KT is started while the tripping or switching-on loop is started. If the circuit breaker mechanism is correctly switched, after the circuit breaker is normally switched, the 3KT of the delay relay returns due to loss of field by adopting a position relay voltage division principle. If the circuit breaker is switched incorrectly, after the delay loop 3KT relay is excited for 3 seconds, the delay movable contact is closed, the contact starts the intermediate relay 3ZJ coil, and the movable contact is opened. Because two pairs of 3ZJ dynamic break contacts 3ZJ1 and 3ZJ2 are connected in series in the tripping and closing loop of the circuit breaker, the purpose of breaking the tripping and closing loop of the circuit breaker is realized. And secondly, when the position of the auxiliary switch of the circuit breaker is improperly adjusted, and the auxiliary switch is opened and closed simultaneously, a series circuit formed by the open contact and the close contact of the circuit breaker starts a 3KT time-delay open circuit, after the 3KT relay of the time-delay circuit is excited for 3 seconds, the time-delay close contact is closed, a 3ZJ coil of the intermediate relay is started, and two pairs of open contacts of the 3ZJ relay are opened, so that the tripping and closing circuit of the circuit breaker is disconnected.
The invention has the positive effects that:
when the 35KV and 10KV power systems are operated and the line fault is tripped or closed, the device can ensure that a 3SJ time-delay breaking loop is started simultaneously when a normal breaker tripping or closing loop is started. If the circuit breaker is normally switched within 3 seconds, the relay automatically loses magnetism and returns within 3SJ time, and the normal operation of the circuit breaker is not influenced. If abnormal conditions such as circuit breaker mechanism faults, incomplete switching of auxiliary switch contacts, long-term self-holding of a remote control loop and the like occur, the circuit breaker cannot be normally switched within 3 seconds, after 3 seconds, a relay delay make-make contact is closed to start a 3ZJ intermediate relay in 3SJ time, a 3ZJ break contact is opened, and the 3ZJ break contact breaks a circuit breaker tripping and closing loop, so that the burning probability of a circuit breaker coil is reduced. Because the probability that the tripping and closing coil is burnt due to the fact that the circuit breaker is broken and the movable contact is simultaneously connected in the actual operation of the circuit breaker is high, the device is specially provided with a time-delay breaking loop which is directly started after the circuit breaker is broken and the movable contact is connected in series, and the purpose of protecting the tripping and closing coil of the circuit breaker is achieved.
Drawings
FIG. 1 is a logic block diagram of the present invention;
FIG. 2 is a schematic circuit diagram of the apparatus of the present invention;
in the figure, the SA-breaker controls the switch; 2HJ 1-reclosing exit contact; KCF 2-break contact of the jump-proof relay; 3ZJ 1-break contact of intermediate relay; QF 1-breaker break contact; a LC-breaker closing contactor coil; TWJ-trip position relay coil; 3R-resistance; FU-power supply; KOM-protection outlet relay contacts; KCF-coil of anti-jump relay, 3ZJ 2-break contact of intermediate relay; QF 2-breaker make contact; LT-breaker trip coil; HWJ-closing position relay coil; 4R-resistance; 3 KT-time relay coil; 3KT 1-delayed make contact; 3 ZJ-intermediate relay coil, QF 3-breaker break contact; QF 4-breaker make contact.
The specific implementation mode is as follows:
the following is a detailed discussion of the present invention, which is intended to be illustrative and not limiting, and several examples are given herein, and thus modifications within the scope of the invention are intended to be included within the scope of the present invention.
Example 1
According to the invention, as shown in fig. 1, when the breaker is switched on or tripped, the other time delay disconnection loop 3KT is started while the tripping or switching-on loop is started. If the circuit breaker mechanism is correctly switched, after the circuit breaker is normally switched, the 3KT of the delay relay returns due to loss of field by adopting a position relay voltage division principle. If the circuit breaker is switched incorrectly, after the delay loop 3KT relay is excited for 3 seconds, the delay movable contact is closed, the contact starts the intermediate relay 3ZJ coil, and the movable contact is opened. Because two pairs of 3ZJ dynamic break contacts 3ZJ1 and 3ZJ2 are connected in series in the tripping and closing loop of the circuit breaker, the purpose of breaking the tripping and closing loop of the circuit breaker is realized. Meanwhile, in order to prevent the phenomenon that the auxiliary switch of the circuit breaker is improperly adjusted, the auxiliary switch is broken and the moving contact is closed at the same time to burn out a tripping and closing coil of the circuit breaker, a series circuit starting 3KT time delay loop consisting of the breaking contact and the moving contact of the circuit breaker is arranged, after the 3KT relay of the time delay loop is excited for 3 seconds, the time delay moving contact is closed, a 3ZJ coil of the intermediate relay is started, two pairs of breaking contacts of the 3ZJ relay are opened, and the 3ZJ two pairs of breaking contacts 3ZJ1 and 3ZJ2 are connected in the tripping and closing loop of the circuit breaker in series, so that the tripping and closing loop of the circuit breaker is disconnected.
Referring to fig. 2, the device of the invention mainly comprises a circuit breaker closing loop, a circuit breaker tripping loop, a time delay breaking loop and an auxiliary contact improper switching loop; wherein:
a circuit breaker closing loop:
the device consists of a circuit breaker control switch SA, a reclosing outlet contact ZHJ1, a jump relay break-preventing contact KCF2, an intermediate relay break-preventing contact 3ZJ1, a circuit breaker break-preventing contact QF1, a circuit breaker closing contactor LC coil, a trip position relay TWJ coil and a 3R resistor.
The SA (five) of the circuit breaker control switch, the SA (eight) contact and the reclosing contact ZHJ1 are connected in parallel, then are connected in series with the breaking contact KCF2 of the jump-proof relay, and are connected with the positive pole of the power supply and the TWJ coil of the trip position relay. The break contact 3ZJ1 of the intermediate relay, the break contact QF1 of the breaker and the coil LC of the closing contactor of the breaker are connected in series and are connected with the negative pole 2 of the power supply and the TWJ coil of the trip position relay. The divider resistor 3R is connected with the TWJ coil of the trip position relay in series and then connected with the anode 1 of the power supply.
When a control switch SA is adopted for switching on or reclosing after a line is tripped, the control switch SA (fifth) and the SA (eighth) contact are closed or the reclosing ZHJ1 contact is closed, so that the following two functions are realized: firstly, a closing pulse command is sent to a series circuit consisting of a 3ZJ1 contact, a QF1 contact and an LC coil, so that the closing of the circuit breaker is realized. And secondly, starting a 3KT time relay coil. The TWJ relay can be used for monitoring the tripping position of the circuit breaker and can also realize the functions of dividing voltage of an LC coil and dividing voltage of a 3KT coil. The 3R is connected with the TWJ coil in series to play a role in voltage division and prevention of the TWJ coil from being burnt.
A circuit breaker trip loop:
the device consists of a circuit breaker control switch SA, a protection outlet relay contact KOM, a jump-proof relay KCF coil, an intermediate relay break contact 3ZJ2, a circuit breaker make contact QF2, a circuit breaker tripping coil LT, a switching-on position relay HWJ coil and a 4R resistor.
And SA and KOM contacts of the circuit breaker control switch are connected in parallel, then are connected in series with a coil of a jump-proof relay KCF and are connected with the positive pole of a power supply and a coil of a switching-on position relay HWJ. The break contact 3ZJ2 of the intermediate relay, the breaker break contact QF2 and the breaker tripping coil LT are connected in series and are connected with the power supply cathode 2 and the closing position relay HWJ coil. The voltage dividing resistor 4R is connected in series with the coil of the on-position relay HWJ and then connected to the positive power supply 1.
When the control switch SA is adopted for tripping or protection tripping, the control switches SA (sixth) and SA (seventh) contact closing or KOM contact closing realize the following three functions: firstly, the coil of the jump-proof relay KCF is started, the break contact KCF2 is opened, and a closing loop is disconnected. And secondly, a tripping pulse is sent to a series circuit consisting of a 3ZJ2 contact, a QF2 contact and an LT coil, so that the tripping of the circuit breaker is realized. And thirdly, starting the 3KT coil. The HWJ relay can be used for monitoring the closing position of the breaker and can also realize the functions of dividing voltage of the LT coil and 3KT coil. The 43R and HWJ coils are connected in series to divide voltage and prevent HWJ coils from burning.
And (3) delaying to disconnect a loop:
the device is composed of a time relay 3KT coil, a time delay movable contact thereof and an intermediate relay 3ZJ coil. To ensure a normal tripping of the circuit breaker or a mechanical switching of the contract mechanism, the time relay 3KT is provided with a delay of 3 seconds.
The time relay 3KT coil is connected with the coil of the switch-on position relay HWJ and the power supply cathode 2, and the time relay delay moving switch-on contact 3KT1 is connected with the intermediate relay 3ZJ coil in series and then is respectively connected with the power supply anode 1 and the power supply cathode 2.
When the breaker is tripped or contracted, the following two functions are realized, namely, a tripping or closing pulse command is sent to a closing loop formed by connecting 3ZJ1, QF1 and LC in series or a tripping loop formed by connecting 3ZJ2, QF2 and LT in series, if the breaker is correctly switched on or tripped (the time for completing mechanical switching of tripping and closing is normally less than 2 seconds), voltage division of a 3KT coil by 4R and HWJ or 3R and TWJ is realized, and the 3KT coil is demagnetized and returned. And secondly, after the 3KT coil is excited and started, if the tripping and closing switching of the circuit breaker is incorrect within 3 seconds, after 3 seconds, the moving contact 3KT1 is closed, the 3ZJ coil is started, and the moving contact 3ZJ1 and 3ZJ2 break the switching-on loop and the tripping loop of the circuit breaker.
Auxiliary contact improper switching loop:
the device is formed by connecting a pair of break contacts QF3 and a make contact QF4 of a circuit breaker in series.
The breaker dynamic break contact QF3 and the dynamic close contact QF4 are connected in series and then connected with the power supply positive pole 1 and the coil of the switching-on position relay HWJ.
When the breaker trips or closes, when the movable contact and the movable contact are simultaneously connected, the QF3 and the QF4 are both closed, a series circuit consisting of the QF3 and the QF4 starts the 3KT coil, the delay movable contact 3KT1 is closed after 3 seconds to start the 3ZJ coil, and the movable contact of the 3ZJ1 and the 3ZJ2 breaks the closing circuit and the tripping circuit of the breaker. And simultaneously sends out a breaker switching fault signal.
Claims (1)
1. The utility model provides a prevent circuit breaker coil burnout device which characterized in that: the circuit breaker comprises a breaker closing loop, a breaker tripping loop, an auxiliary contact improper switching starting loop and a time delay breaking loop; wherein,
1) a circuit breaker closing loop:
the relay protection device comprises a circuit breaker control switch SA, a reclosing outlet contact ZHJ1, a tripping contact KCF2 of an anti-jump relay, a tripping contact 3ZJ1 of an intermediate relay, a circuit breaker tripping contact QF1, a circuit breaker closing contactor LC coil, a tripping position relay TWJ coil and a voltage dividing resistor 3R; a closing contact of a circuit breaker control switch SA is connected with a reclosing outlet contact ZHJ1 in parallel, then is connected with a breaking contact KCF2 of a jump-proof relay in series and is connected with a power supply anode FU1 and a tripping position relay coil TWJ; the break contact 3ZJ1 of the intermediate relay, the break contact QF1 of the circuit breaker and the coil LC of the closing contactor of the circuit breaker are connected in series and are connected with the negative electrode of the power supply FU2 and the relay coil TWJ at the tripping position; the divider resistor 3R is connected with a trip position relay coil TWJ in series and then connected with a power supply anode FU 1;
2) a circuit breaker trip loop:
the relay protection device is composed of a circuit breaker control switch SA, a protection outlet relay contact KOM, a jump-proof relay coil KCF, a break contact 3ZJ2 of an intermediate relay, a circuit breaker break contact QF2, a circuit breaker tripping coil LT, a switching-on position relay coil HWJ and a voltage dividing resistor 4R; the tripping contact of the circuit breaker control switch SA is connected with the relay contact KOM of the protection outlet in parallel, then is connected with the coil KCF of the anti-tripping relay in series and is connected with the positive pole FU1 of the power supply and the relay coil HWJ at the switching-on position; the break contact 3ZJ2 of the intermediate relay, the breaker break contact QF2 and the breaker tripping coil LT form a series connection and are connected with the power supply negative pole FU2 and the switch-on position relay coil HWJ; the divider resistor 4R is connected with a switching-on position relay coil HWJ in series and then is connected with a power supply anode FU 1;
3) auxiliary contact improper switching starting loop
The power supply is formed by connecting a power supply positive electrode FU1, a break contact QF3 and a make contact QF4 in series and then connecting one end of a time relay coil 3KT, wherein the other end of the time relay coil 3KT is connected with a power supply negative electrode FU 2;
4) and (3) delaying to disconnect a loop:
the time relay comprises a time relay coil 3KT, a time delay moving contact 3KT1 and an intermediate relay coil 3 ZJ; the time relay coil 3KT is connected with the switching-on position relay coil HWJ and the power supply cathode FU 2; the time relay delay moving contact 3KT1 is connected with the intermediate relay coil 3ZJ in series and then is respectively connected with a power supply anode FU1 and a power supply cathode FU2, and in order to ensure the normal tripping and closing of the circuit breaker, the time relay 3KT is provided with 3-second delay; one end of a break contact 3ZJ1 of the intermediate relay is connected with a break contact QF1 of the circuit breaker, and the other end is connected with a trip position relay coil TWJ;
one end of the break contact 3ZJ2 of the intermediate relay is connected with the break-make contact QF2 of the breaker, and the other end is connected with the switch-on position relay coil HWJ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310333512.5A CN103426695B (en) | 2013-08-02 | 2013-08-02 | A kind of prevent breaker coil from burning method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310333512.5A CN103426695B (en) | 2013-08-02 | 2013-08-02 | A kind of prevent breaker coil from burning method and device |
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| CN103426695A CN103426695A (en) | 2013-12-04 |
| CN103426695B true CN103426695B (en) | 2016-01-13 |
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| CN201310333512.5A Expired - Fee Related CN103426695B (en) | 2013-08-02 | 2013-08-02 | A kind of prevent breaker coil from burning method and device |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103839702B (en) * | 2014-03-27 | 2015-10-07 | 莱芜钢铁集团有限公司 | A kind of closing circuit of circuit breaker |
| CN105406447A (en) * | 2015-11-20 | 2016-03-16 | 河南平芝高压开关有限公司 | Closing coil protection apparatus |
| CN106057595B (en) * | 2016-07-21 | 2018-09-11 | 华自科技股份有限公司 | The power switch device of breaker outlet loop |
| CN109599279B (en) * | 2018-12-29 | 2024-03-22 | 国家电网有限公司 | Control device of circuit breaker |
| CN110148545B (en) * | 2019-06-20 | 2024-04-26 | 吉林永大电气开关有限公司 | Emergency brake-separating time-delay restarting device of permanent magnet circuit breaker |
| CN113315098A (en) * | 2021-06-04 | 2021-08-27 | 贵州电网有限责任公司 | Control circuit for preventing breaker tripping coil from being burnt |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0255518A (en) * | 1988-08-19 | 1990-02-23 | Mitsubishi Electric Corp | Circuit breaker |
| CN201796825U (en) * | 2010-09-19 | 2011-04-13 | 鞍钢股份有限公司 | Circuit of switching-on tripping coil of anti-burning circuit breaker |
| CN202855675U (en) * | 2012-10-15 | 2013-04-03 | 江苏省如高高压电器有限公司 | Apparatus for protecting circuit breaker coil |
| CN203481154U (en) * | 2013-08-02 | 2014-03-12 | 北京工业大学 | Device for preventing circuit breaker coils from being burnt |
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