CN103022985B - Closing coil protective device - Google Patents
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- CN103022985B CN103022985B CN201210519895.0A CN201210519895A CN103022985B CN 103022985 B CN103022985 B CN 103022985B CN 201210519895 A CN201210519895 A CN 201210519895A CN 103022985 B CN103022985 B CN 103022985B
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- 230000015572 biosynthetic process Effects 0.000 claims description 6
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- 238000006073 displacement reaction Methods 0.000 description 5
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Abstract
The invention discloses a kind of closing coil protective device, comprise the normally closed contact of the relay J D1 connected with the closing coil HQ in the sub-switch circuit of switch, and the pressure sampling circuit for control relay JD1 normally closed contact break-make be connected in series successively, negater circuit and control protection electric circuit, wherein said pressure sampling circuit has two, one is connected with the closing coil HQ in sub-switch circuit, and another is connected with switching winding TQ in combined floodgate circuit; Described negater circuit has two, is connected in series respectively with two pressure sampling circuits, and the voltage transitions for being exported by pressure sampling circuit becomes the receivable voltage of control protection electric circuit; Control protection electric circuit, for the voltage that collects according to two pressure sampling circuits and the scheduled time, the break-make of control relay JD1.The present invention is the principle based on gathering collection point change in voltage before and after switch control circuit combined floodgate, can not only control the disconnection of the circuit of closing coil timely, avoiding closing coil reliably by the phenomenon of burning when closing a floodgate unsuccessful.
Description
Technical field
The present invention relates to a kind of electric system protection device, be specifically related to a kind of closing coil protective device.
Background technology
At present, unattended substation is all popularized, switch point, closing operation is many carries out from a distant place or supervising device.But due to the switch quality of 35kV and following transformer station can not be very strict the requirement of the severe running environment in satisfied scene, after running a period of time, closing coil often burns.In daily defect processing work, change closing coil and account for suitable workload.
When switch need become conjunction state from a point state, after sending switching signal, due to the existence keeping loop of closing a floodgate, closing coil can be always charged, until switch successfully closes a floodgate.In real process, main easily to occur that 3 kinds of faults cause successfully closing a floodgate and burn closing coil: 1, the non-energy storage of motor, 2, energy storage motor auxiliary contact burns, 3, mechanical jam in switch making process, as five anti-mechanical latchings etc.Operation circuit must have charged maintenance loop to be existing provision regulation, so when switch closes a floodgate unsuccessful, because closing coil is always charged, when charged after about 8 seconds, closing coil starts sharply to generate heat, and after about 20 seconds, causes burning of closing coil the most at last.
If after combined floodgate is unsuccessful, control power supply can be disconnected in time, just can avoid burning of closing coil, but major part operation now completes all in the distance, when occurring that switch closes a floodgate unsuccessful, operating personnel can not disconnect control power supply timely, and burning of closing coil becomes inevitable.
In addition, closing coil is often in the middle part of switching mechanism, along with the integrated design of switch increases gradually, volume of switch is less, and structure is more exquisite, changes that to remove the closing coil that position burns out that mediates very difficult, maintenance interruption duration is also extended, and has a strong impact on power supply reliability.
Operation circuit must have charged maintenance loop to be existing provision regulation, so charged maintenance function is unalterable.Before this, also someone proposed the problem about divide-shut brake loop protection device.But general principle is the electric current by suddenling change during divide-shut brake carrys out starting protection device.But this protector also has following weak point: the switch 1, being exactly same model, due to the difference of manufacturer, closing coil model, switching current is also different, starts and judges very accurately, do not have general applicability; 2, current measuring element must be sealed in loop to detect electric current, like this voltage distribution on the coil in original loop being impacted.The resistance of operation circuit has strict demand, if detecting element dividing potential drop is too high, will the voltage at coil two ends is caused to reduce, and then causes switch not close a floodgate; 3, original reliability of electronic components is poor, seals in the device that reliability is not high in operation circuit, adds the unsteadiness of operation circuit on the contrary.If device burns, control loop template must be caused.Can not divide-shut brake during appearance accident, cause accident to expand further; 4, original device volume is large, and complex structure, is not easy to install and use.So even to this day, also do not occur the protection to closing circuit in new installed equipment, though five anti-devices get more and more, mechanical latching gets more and more, and such present situation just more easily causes burning of closing coil.
Summary of the invention
The object of the present invention is to provide a kind of closing coil protective device, solve current closing switch control instability unreliable, easily occur closing a floodgate the unsuccessful coil that causes by the problem of burning.
For solving above-mentioned technical problem; the present invention is by the following technical solutions: a kind of closing coil protective device; comprise the normally closed contact of the relay J D1 connected with the closing coil HQ in the sub-switch circuit of switch; and the pressure sampling circuit for control relay JD1 normally closed contact break-make be connected in series successively, negater circuit and control protection electric circuit, wherein
Described pressure sampling circuit has two, and one is connected with the closing coil HQ in sub-switch circuit, and another is connected with switching winding TQ in combined floodgate circuit, for being exported by the voltage of closing coil HQ and switching winding TQ place;
Described negater circuit has two, is connected in series respectively with two pressure sampling circuits, and the voltage transitions for being exported by pressure sampling circuit becomes the receivable voltage of control protection electric circuit;
Control protection electric circuit, for the voltage that collects according to two pressure sampling circuits and the scheduled time, the break-make of control relay JD1.
Further technical scheme is that the above-mentioned pressure sampling circuit being connected to closing coil HQ is mainly made up of the resistance R2 of resistance R1,2k Ω of 53k Ω and the resistance R8 of 27k Ω, closing coil HQ wherein in R1 connecting dividing lock circuit, described resistance R2 one end and resistance R1 are connected in series, other end ground connection, resistance R8 one end is connected between resistance R1 and resistance R2, and the other end connects negater circuit; The described pressure sampling circuit being connected to switching winding TQ is mainly made up of the resistance R4 of resistance R3,2k Ω of 53k Ω and the resistance R10 of 27k Ω, closing coil HQ wherein in R3 connecting dividing lock circuit, described resistance R4 one end and resistance R3 are connected in series, other end ground connection, resistance R10 one end is connected between resistance R3 and resistance R4, and the other end connects negater circuit.
Further to be the above-mentioned negater circuit be connected in series with closing coil HQ formed primarily of the resistance R7 of LM358AM operational amplifier and 27k Ω technical scheme, wherein said resistance R7 also connects and the negative input of LM358AM operational amplifier and output, and pressure sampling circuit is connected with the negative input of LM358AM operational amplifier; The described negater circuit be connected in series with switching winding TQ is formed primarily of the resistance R9 of LM358AM operational amplifier and 27k Ω, wherein said resistance R9 also connects and the negative input of LM358AM operational amplifier and output, and pressure sampling circuit is connected with the negative input of LM358AM operational amplifier.
Further technical scheme is that above-mentioned control protection electric circuit is mainly made up of LCP915 type single-chip microcomputer, 8050 type triode Q1; the voltage that closing coil HQ changes is from 6 pin accesses of LCP915 single-chip microcomputer; the voltage that switching winding TQ changes is from 7 pin accesses of LCP915 single-chip microcomputer; the base stage of 8050 type triode Q1 is connected to 1 pin of LCP915 type single-chip microcomputer; the grounded emitter of 8050 type triode Q1, collector connection relay JD1.
Further technical scheme is that above-mentioned control protection electric circuit is also connected with the alarm circuit of LED light-emitting diode D1 formation and the work cue circuit of LED light-emitting diode D2 formation.
Compared with prior art, the invention has the beneficial effects as follows: the present invention is the principle based on gathering collection point change in voltage before and after switch control circuit combined floodgate, the disconnection of the circuit of closing coil can not only be controlled timely when closing a floodgate unsuccessful, avoid closing coil reliably by the phenomenon of burning, there is following advantage: do not need measure loop to seal in closing circuit, decrease the impact on closing circuit, even if break down, also can not affect closing circuit; External circuit design is succinct, is convenient to investigate loop fault; Be convenient to install, compact, can be directly installed on by protection screen or protective device, even if break down, also can change easily; Without the need to opening breaker cabinet door, also need not have a power failure hanging earthing conductor, improves job security, decrease the interruption maintenance time.
Accompanying drawing explanation
Fig. 1 is existing combined floodgate circuit connection diagram.
Fig. 2 is the installation site schematic diagram of closing coil protective device repeat circuit normally closed contact of the present invention in combined floodgate circuit.
Fig. 3 is the circuit connection diagram of a closing coil protective device of the present invention embodiment.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, operation KK switch, the displacement of normal opened contact 9,10 contact for connecting, or adopts control combined floodgate mode far away to existing combined floodgate circuit: after contact YH connects, HBJ is charged for combined floodgate latching relay, and HBJ auxiliary contact closes.Afterwards, even if after KK switch 9,10 contact or far control combined floodgate contact YH disconnection, closing coil HQ is still charged, until close a floodgate successfully, this process normally about needs 0.2 second.Because the auxiliary contact DL1 displacement of switch about needs 0.2 second time, so 5, No. 6 terminal voltage are 0V in this process.The auxiliary normally closed contact DL1 displacement of the switch closed a floodgate successfully before closing coil HQ is off, and No. 5 terminal voltage are 0V.The auxiliary normal opened contact DL2 displacement of the switch before breaking coil TQ is closed, and No. 6 terminal voltage are-110V.Under switch combined floodgate normal condition sequence 5,6 galvanic series lists are in table 1.
| Normal combined floodgate status switch | No. 5 junction voltage (V) | No. 6 junction voltage (V) | Hold mode |
| Divide position | -110 | 0 | Keep |
| Close a floodgate moment | 0 | 0 | Be less than 0.2 second |
| Close a floodgate successfully | 0 | -110 | Keep |
If switch is because a variety of causes can not close a floodgate successfully, the equal invariant position of auxiliary contact DL1, DL2 of switch, under the unsuccessful status switch that closes a floodgate 5,6 galvanic series lists are in table 2.Visible 5, No. 6 terminal voltage are 0V.Visible, if switch is because a variety of causes can not close a floodgate successfully, the auxiliary contact DL1 of switch just can not disconnect.When closing coil HQ is always charged, after 20 seconds, Burnout of Closing Coil can be caused.
| Combined floodgate abnormality sequence | No. 5 junction voltage (V) | No. 6 junction voltage (V) | Hold mode |
| Divide position | -110 | 0 | Keep |
| Close a floodgate moment | 0 | 0 | Be less than 0.2 second |
| Close a floodgate unsuccessful | 0 | 0 | Keep |
Fig. 2 and Fig. 3 shows an embodiment of closing coil protective device of the present invention: the normally closed contact comprising the relay J D1 connected with the closing coil HQ in the sub-switch circuit of switch; and the pressure sampling circuit for control relay JD1 normally closed contact break-make be connected in series successively, negater circuit and control protection electric circuit; wherein
Described pressure sampling circuit has two, one is connected with the closing coil HQ in sub-switch circuit, another is connected with switching winding TQ in combined floodgate circuit, for being exported by the voltage of closing coil HQ and switching winding TQ place, namely can-4V be become to export with-110V the voltage at switching winding TQ place closing coil HQ;
Described negater circuit has two, is connected in series respectively with two pressure sampling circuits, and the voltage transitions for being exported by pressure sampling circuit becomes the receivable voltage of control protection electric circuit, is namely divided into the Power convert one-tenth+4V of-4V;
Control protection electric circuit, for the voltage that collects according to two pressure sampling circuits and the scheduled time, the break-make of control relay JD1.
According to another embodiment of closing coil protective device of the present invention, the pressure sampling circuit being connected to closing coil HQ is mainly made up of the resistance R2 of resistance R1,2k Ω of 53k Ω and the resistance R8 of 27k Ω, closing coil HQ wherein in R1 connecting dividing lock circuit, described resistance R2 one end and resistance R1 are connected in series, other end ground connection, resistance R8 one end is connected between resistance R1 and resistance R2, and the other end connects negater circuit; The described pressure sampling circuit being connected to switching winding TQ is mainly made up of the resistance R4 of resistance R3,2k Ω of 53k Ω and the resistance R10 of 27k Ω, closing coil HQ wherein in R3 connecting dividing lock circuit, described resistance R4 one end and resistance R3 are connected in series, other end ground connection, resistance R10 one end is connected between resistance R3 and resistance R4, and the other end connects negater circuit.Because the voltage that single-chip microcomputer can identify is at 0 ~ 5V, and 5,6 point voltages are-110V, so be first-4V by-110 step-downs, V1, V2 point namely in Fig. 2, like this, even if when input voltage fluctuation, single-chip microcomputer also can identify the signal of input reliably.
Dividing potential drop adopts electric resistance partial pressure, in Fig. 25, the input signal-110V of 6 by resistance R1, R2, R3, R4 form, and dividing potential drop is-4V.Because 5, the operation principle of two bleeder circuits of 6 and state just the same, the design principle of circuit is now described with the bleeder circuit of 5; According to voltage division formulas: U
r1/ U
r2=R1/R2, because: U
r2=-4V, U
r1=-110V-(-4V)=-106V, so: R/R3=106/4=26.5.In order to reduce the impact of divider resistance dissipation power on loop, the maximum current on divider resistance is 2mA, according to I
always=U
always/ R
always, then R is had
always=U
always/ I
always=110V/0.002=55000 Ω, R2=U
r2/ I
always=-4V/0.002=2K Ω, then R1=55K Ω-2K Ω=53K Ω.Like this, the voltage-4V after contact 3 and contact 4 just obtain dividing potential drop.Calculate known according to sample circuit, in circuit, the maximum diffipation power of resistance is P=I
2r=(0.002)
2x55K Ω=0.22W, for reducing the caloric value of sample resistance, the reliability of increasing circuit work, the resistance of resistance selection 2W, for improving sampling precision, reducing temperature drift, selecting the 5 colour circle metal film precision resisters of 2W.Because the voltage that the single-chip microcomputer adopted in control protection electric circuit can identify is at 0 ~ 5V; and be-4V through the voltage of electric resistance partial pressure back contact V1 and contact V2; therefore need it reverse; the voltage of contact V1 and contact V2 is input to the inverting input of amplifier LM358; LM358 is applied as the anti-phase proportional amplifier of 1:1; then the sampling voltage of-4V is transformed to+4V through the anti-phase scale amplifying of LM358, the voltage signal that can be identified by single-chip microcomputer LPC915.Single Chip Microcomputer (SCM) program, according to the state of 6,7 pin I/O input port input voltages, goes to control corresponding circuit.LM358 is dual operational amplifier, and contact V1, V2 respectively use 1/2.
According to another embodiment of closing coil protective device of the present invention, the negater circuit be connected in series with closing coil HQ is formed primarily of the resistance R7 of LM358AM operational amplifier and 27k Ω, wherein said resistance R7 also connects and the negative input of LM358AM operational amplifier and output, and pressure sampling circuit is connected with the negative input of LM358AM operational amplifier; The described negater circuit be connected in series with switching winding TQ is formed primarily of the resistance R9 of LM358AM operational amplifier and 27k Ω, wherein said resistance R9 also connects and the negative input of LM358AM operational amplifier and output, and pressure sampling circuit is connected with the negative input of LM358AM operational amplifier.The LCP915 single-chip microcomputer of 8BIT selected by control circuit, and this single-chip microcomputer is the low-power consumption technical grade single-chip microcomputer that Philips Semiconductor Co., Ltd. releases, and inner integrated oscillator, does not need external any auxiliary circuit during work, and circuit structure is simple, and reliability is high; The inner program space also having 4Kbyte, can for user program.Utilize the programmable timer of single-chip microcomputer inside, according to "on" position sequence table: table 1, table 2, establishment corresponding program controls the work of closing coil protective device.When contact 5,6 point voltage becomes 0V, single-chip microcomputer 6,7 pin is outputted to by sampling dividing potential drop, negater circuit, program starts timer, if contact 5,6 point voltage is 0V always, after timing 2s arrives, relay J D1 normally closed contact 3,4 disconnects trip(ping) circuit, and normal opened contact 7,8 closes, accessible remote motion signal device sends unsuccessful alarm of closing a floodgate, and alarm lamp is lighted simultaneously.No matter how work as front contact 5,6 point voltage, program timer continues timing, after 10s, and, then Single Chip Microcomputer (SCM) program exports reseting controling signal, and circuit gets back to original state.3 pin of LPC915 are electrification reset function pin, and 3 pin contact resistance R11 receive power supply+5V, can normally work after single-chip microcomputer electrification reset, and 10 pin are working power+5v, C1 is power filtering capacitor.
According to another embodiment of closing coil protective device of the present invention; control protection electric circuit is mainly made up of LCP915 type single-chip microcomputer, 8050 type triode Q1; the voltage that closing coil HQ changes is from 6 pin accesses of LCP915 single-chip microcomputer; the voltage that switching winding TQ changes is from 7 pin accesses of LCP915 single-chip microcomputer; the base stage of 8050 type triode Q1 is connected to 1 pin of LCP915 type single-chip microcomputer; the grounded emitter of 8050 type triode Q1, collector connection relay JD1.
According to another embodiment of closing coil protective device of the present invention, control protection electric circuit is also connected with the alarm circuit of LED light-emitting diode D1 formation and the work cue circuit of LED light-emitting diode D2 formation.Single Chip Microcomputer (SCM) program judges that the "on" position sequence set point gathered is after unsuccessful 2 seconds, and LPC915 the 1st pin exports and controls executive signal, high level; Drive triode Q1 conducting, drive relay J D1 action, normally closed contact 3,4 disconnects trip(ping) circuit, and normal opened contact 7,8 closes, and accessible remote motion signal device sends unsuccessful alarm of closing a floodgate.Single-chip microcomputer the 14th pin output low level simultaneously, alarm lamp is lighted.Diode D15 is the fly-wheel diode of relay J D1, self-excitation when preventing JD1 from working.The model that triode Q1 model is 8050, diode D15 model is 1N4148, relay J D1 is RELAY.D, requires that relay working voltage is 5v, contact operating current is 5A.Alarm lamp is light-emitting diode D1, and single-chip microcomputer the 14th pin output low level, alarm lamp is bright, reminding user.The connection of alarm lamp is: after connecting with diode D1 positive pole after power supply+5V contact resistance R13, negative pole is connected LPC915 the 14th pin.Relay indicating light, the direct ground connection of negative pole after connecting with diode D2 positive pole after power supply+5V chain connecting resistance R33, after equipment access working power, relay indicating light is luminous, shows that equipment is started working.
When switch is in disjunction position, normally closed contact DL1 assisted by the switch before closing coil HQ, and the JD1 normally closed contact of the protective device sealed in is in the close position, and No. 5 terminal voltage are-110V.No. 6 terminal voltage are 0V.When switch need become conjunction state from a point state, as adopted local combined floodgate mode: operation KK switch, the displacement of normal opened contact 9,10 contact is for connecting.Or adopt control combined floodgate mode far away: after contact YH connects, HBJ is charged for combined floodgate latching relay, and HBJ auxiliary contact closes.Afterwards, even if after KK switch 9,10 contact or far control combined floodgate contact YH disconnection, closing coil HQ is still charged.
If switch is because a variety of causes can not close a floodgate successfully; closing protective device starts to start internal protection loop; after timing 2s arrives; relay J D1 action; normally closed contact disconnects trip(ping) circuit; normal opened contact 7,8 closes, and (be used for accessing remote motion signal device and send unsuccessful warning of closing a floodgate) simultaneously alarm lamp lights.Now no matter how work as front contact 5,6 point voltage, then timer continues timing, after 10s, and, then single-chip microcomputer exports reseting controling signal, and circuit gets back to original state.Now can again attempt closing a floodgate.If it is unsuccessful to attempt combined floodgate for several times, maintainer just need be allowed to check failure cause.
Although with reference to multiple explanatory embodiment of the present invention, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other amendment and execution mode, these amendments and execution mode will drop within spirit disclosed in the present application and spirit.More particularly, in the scope of, accompanying drawing open in the application and claim, multiple modification and improvement can be carried out to the building block of subject combination layout and/or layout.Except the modification of carrying out building block and/or layout is with except improvement, to those skilled in the art, other purposes also will be obvious.
Claims (4)
1. a closing coil protective device; it is characterized in that: the normally closed contact comprising the relay J D1 connected with the closing coil HQ in the sub-switch circuit of switch; and the pressure sampling circuit for control relay JD1 normally closed contact break-make be connected in series successively, negater circuit and control protection electric circuit, wherein
Described pressure sampling circuit has two, and one is connected with the closing coil HQ in sub-switch circuit, and another is connected with switching winding TQ in combined floodgate circuit, for being exported by the voltage of closing coil HQ and switching winding TQ place;
Described negater circuit has two, is connected in series respectively with two pressure sampling circuits, and the voltage transitions for being exported by pressure sampling circuit becomes the receivable voltage of control protection electric circuit;
Control protection electric circuit, for the voltage that collects according to two pressure sampling circuits and the scheduled time, the break-make of control relay JD1;
Described control protection electric circuit is mainly made up of LCP915 type single-chip microcomputer, 8050 type triode Q1; the voltage that closing coil HQ changes is from 6 pin accesses of LCP915 single-chip microcomputer; the voltage that switching winding TQ changes is from 7 pin accesses of LCP915 single-chip microcomputer; the base stage of 8050 type triode Q1 is connected to 1 pin of LCP915 type single-chip microcomputer; the grounded emitter of 8050 type triode Q1, collector connection relay JD1.
2. closing coil protective device according to claim 1, it is characterized in that: described in be connected to closing coil HQ pressure sampling circuit be mainly made up of the resistance R2 of resistance R1,2k Ω of 53k Ω and the resistance R8 of 27k Ω, closing coil HQ wherein in R1 connecting dividing lock circuit, described resistance R2 one end and resistance R1 are connected in series, other end ground connection, resistance R8 one end is connected between resistance R1 and resistance R2, and the other end connects negater circuit; The described pressure sampling circuit being connected to switching winding TQ is mainly made up of the resistance R4 of resistance R3,2k Ω of 53k Ω and the resistance R10 of 27k Ω, closing coil HQ wherein in R3 connecting dividing lock circuit, described resistance R4 one end and resistance R3 are connected in series, other end ground connection, resistance R10 one end is connected between resistance R3 and resistance R4, and the other end connects negater circuit.
3. closing coil protective device according to claim 1, it is characterized in that: the described negater circuit be connected in series with closing coil HQ is formed primarily of the resistance R7 of LM358AM operational amplifier and 27k Ω, wherein said resistance R7 also connects and the negative input of LM358AM operational amplifier and output, and pressure sampling circuit is connected with the negative input of LM358AM operational amplifier; The described negater circuit be connected in series with switching winding TQ is formed primarily of the resistance R9 of LM358AM operational amplifier and 27k Ω, wherein said resistance R9 also connects and the negative input of LM358AM operational amplifier and output, and pressure sampling circuit is connected with the negative input of LM358AM operational amplifier.
4. closing coil protective device according to claim 1, is characterized in that: described control protection electric circuit is also connected with the alarm circuit of LED light-emitting diode D1 formation and the work cue circuit of LED light-emitting diode D2 formation.
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| CN201210519895.0A CN103022985B (en) | 2012-12-07 | 2012-12-07 | Closing coil protective device |
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| CN201210519895.0A CN103022985B (en) | 2012-12-07 | 2012-12-07 | Closing coil protective device |
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| CN103236810B (en) * | 2013-05-20 | 2016-06-29 | 江苏凯隆电器有限公司 | Intelligent electric machine control protection system |
| 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 |
| CN105466604A (en) * | 2015-11-20 | 2016-04-06 | 国家电网公司 | Calculation method and apparatus for calorific value of switch electromagnet coil |
| CN105281301A (en) * | 2015-11-20 | 2016-01-27 | 国网浙江省电力公司文成县供电公司 | Switch electromagnet coil protection device |
| CN109166770A (en) * | 2018-09-20 | 2019-01-08 | 湖北长江电气有限公司 | A kind of high-tension switch cabinet inner breaker divide-shut brake coil state instruction device |
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| CN203071569U (en) * | 2012-12-07 | 2013-07-17 | 四川省电力公司内江电业局 | Closing coil protection apparatus |
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| CN101060245A (en) * | 2006-04-21 | 2007-10-24 | 北海银河高科技产业股份有限公司 | Breaker coil protector |
| CN101110517A (en) * | 2007-08-17 | 2008-01-23 | 谭启仁 | Intelligent electricity-saving electricity-guard socket of drinking machine |
| CN100593274C (en) * | 2008-01-25 | 2010-03-03 | 北海银河开关设备有限公司 | A close loop protection circuit for middle voltage breaker |
| CN202260420U (en) * | 2011-10-08 | 2012-05-30 | 安徽鑫龙电器股份有限公司 | Protection circuit for opening and closing coils |
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| CN203071569U (en) * | 2012-12-07 | 2013-07-17 | 四川省电力公司内江电业局 | Closing coil protection apparatus |
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