CN203632226U - Switch-on current tripper - Google Patents
Switch-on current tripper Download PDFInfo
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- CN203632226U CN203632226U CN201320864023.8U CN201320864023U CN203632226U CN 203632226 U CN203632226 U CN 203632226U CN 201320864023 U CN201320864023 U CN 201320864023U CN 203632226 U CN203632226 U CN 203632226U
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Abstract
The utility model discloses a switch-on current tripper. The tripper is connected with a current transformer, a breaker closed and opening state signal output interface, a magnetic flux converter, etc. The current transformer comprises a Rogowski coil and an iron core coil; and the switch-on current tripper comprises an integrating circuit, a signal comparison circuit, a switch-on current protection reference circuit, a switch-on current protection opening/closing circuit, a logic 'and' circuit, a rapid saturation circuit, a tripping drive circuit and a DC/DC generating +-VCC circuit. Through the improvement of a hardware circuit, action time of breaker short-circuit switch-on current protection is greatly shortened, and the problems of the high equipment loss and the short breaker service life due to long consumption time of intelligent components, such as MCU or DSP, adopted in the prior art are solved; and, according to the device, the action time (the action time is less than 20ms) of the breaker short-circuit switch-on current protection is shortened, the service life a breaker is improved, and safety and reliability of electric power operation are also improved.
Description
Technical field
The utility model relates to a kind of making current release.
Background technology
Closing of power circuit breaker current protecting function (make current release; be called for short MCR) be a kind of important self-protection function that current many low-voltage circuit breakers possess; specific definition is that circuit breaker is in making process; making current exceedes the instantaneous disconnection of predetermined value circuit breaker, and making current release is failure to actuate after breaker closing.Along with computer, the communication technology, the develop rapidly of electronic technology, existing low-voltage circuit breaker is by adding MCU(microcontroller) or DSP(digital signal processor) etc. advanced person's electronic devices and components make circuit breaker realize intellectuality to current protection, wherein can certainly comprise making current protection, but the electrification reset that MCU or DSP are intrinsic, initialization, the elapsed times such as detection calculations are longer, particularly circuit breaker in without accessory power supply situation closed while running into large short circuit current operate time of protection often more than 100ms, wherein electrification reset, initialization accounts for more than 80%.For subscriber equipment and controller switching equipment, run into large short circuit current in the time of breaker closing time, to exceed operate time of protection more than 100ms be very disadvantageous to circuit breaker, can severe attrition equipment, and the useful life of greatly reducing circuit breaker.Therefore, shorten the operate time of circuit breaker short circuit making current protection, use, improve circuit breaker for safe distribution of electric power and there is positive meaning useful life.
Summary of the invention
Technical problem to be solved in the utility model is: a kind of making current release is provided; by the improvement to hardware circuit; greatly shorten the operate time of circuit breaker short circuit making current protection, solved available technology adopting MCU or DSP intelligence components and parts elapsed time length and made that equipment loss is large, circuit breaker short problem in useful life.
The present invention, for solving the problems of the technologies described above, adopts following technical scheme:
A kind of making current release, this release respectively with current transformer, circuit breaker on/off switch status signal output interface, magnetic flow convertor connects, described current transformer comprises that eat can Paderewski coil, iron-core coil, described making current release is characterized in that: comprise integrating circuit, signal comparator circuit, making current protection reference circuit, making current protection switch circuit, logical “and” circuit, speed saturated circuit, dropout drive circuit, DC/DC generation ± VCC circuit, eating of described current transformer can the output of Paderewski coil be connected to integrating circuit, integrating circuit is connected to signal comparator circuit, the iron-core coil output of described current transformer is connected to fast saturated circuit, speed saturated circuit is connected to DC/DC generation ± VCC circuit, DC/DC generation ± VCC circuit is connected to making current protection reference circuit, described making current protection reference circuit is connected to signal comparator circuit, signal comparator circuit is connected to logical “and” circuit, logical “and” circuit is connected to dropout drive circuit, dropout drive circuit is connected to magnetic flow convertor, speed saturated circuit is connected to dropout drive circuit, circuit breaker closes, gate-dividing state signal is connected to making current protection switch circuit, making current protection On/Off circuit is connected to logical “and” circuit, circuit breaker splitting or integrating lock status signal is connected with making current protection switch circuit input end, described DC/DC generation ± VCC circuit output ± VCC power supply, is respectively integrating circuit, signal comparator circuit, making current protection reference circuit, making current protection switch circuit, logical “and” circuit, dropout drive circuit provides power supply.Described making current protection On/Off circuit comprises the first comparator, the second comparator, the first triode, the second triode, the first to the 12 resistance, the first to the 3rd electric capacity; The positive input of described the first comparator is connected with circuit breaker on/off switch status signal output interface, and is connected with+VCC power supply by the first resistance, by the first electric capacity be connected; The output of described the first comparator is connected, is connected with the base stage of the first triode by the 3rd resistance with+VCC power supply by the second resistance; The emitter of described the first triode is connected with ground, and collector electrode passes through the 4th resistance and is connected with+VCC power supply, is connected with the base stage of the second triode by the 5th resistance, is connected the 6th resistance between the base stage of the first triode and emitter; The emitter of described the second triode is connected with+VCC power supply, the collector electrode of the second triode is connected with one end of the 7th resistance, the other end of described the 7th resistance is connected with ground through the second electric capacity, the 8th resistance respectively, is connected with the positive input of the second comparator through the 9th resistance; Between described+VCC power supply and ground, connect successively the tenth resistance, the 11 resistance, the node between described the tenth resistance, the 11 resistance is connected with the reverse input end of the first comparator, the reverse input end of the second comparator respectively; The output of described the second comparator is connected with an input of logical “and” circuit, and is connected with+VCC power supply by the 12 resistance; Between described+VCC power supply and ground, be connected the 3rd electric capacity.
Described logical “and” circuit comprises optocoupler, the 3rd triode, the 13 to 15 resistance, the 4th electric capacity; Described optocoupler input, output include first end, the second end; The first end of described optocoupler input is connected with the output of signal comparator circuit by the 13 resistance, and is connected with ground by the 4th electric capacity, and the second end of described optocoupler input is connected with the collector electrode of the 3rd triode; The emitter of described the 3rd triode is connected with ground, and the base stage of described the 3rd triode is connected with the output of making current protection switch circuit by the 14 resistance; Between the base stage of described the 3rd triode and emitter, be connected the 15 resistance; The first end of described optocoupler output is connected with+VCC power supply, and the second end that described optocoupler is exported is connected with the input of dropout drive circuit.
Described integrating circuit comprises active integrating circuit or passive integrator.
Compared with prior art, the utlity model has following beneficial effect:
1, shorten circuit breaker short circuit and connect the operate time (being less than 20ms) of protecting, improve the useful life of circuit breaker and the safety and reliability of operation power.
2, practical function is simple, and cost is lower.
3, when circuit is connected moment; while having Short-Circuit High Current to pass through; because there is no the intrinsic electrification reset of MCU or DSP, initialization, detection calculations time; making current release is responded fast; main cost ± VCC the rise time; circuit breaker is moved within the time that is less than 20ms, effectively shortened the operate time of circuit breaker for short circuit current instantaneous protection, there is positive meaning for safe distribution of electric power.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the utility model embodiment.
Fig. 2 is the integrating circuit of the utility model embodiment.
Fig. 3 is the signal comparator circuit of the utility model embodiment.
Fig. 4 is the MCR reference circuit of the utility model embodiment.
Fig. 5 is the fast saturated circuit of the utility model embodiment.
Fig. 6 is the DC/DC generation ± VCC circuit of the utility model embodiment.
Fig. 7 is the MCR On/Off circuit of the utility model embodiment.
Fig. 8 is the logical “and” circuit of the utility model embodiment.
Fig. 9 is the dropout drive circuit of the utility model embodiment.
Figure 10 is the another kind of form of the integrating circuit of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is elaborated:
As shown in Figure 1, a kind of making current release, this release respectively with current transformer, circuit breaker on/off switch status signal output interface, magnetic flow convertor connects, described current transformer comprises that eat can Paderewski coil, iron-core coil, described making current release is characterized in that: comprise integrating circuit, signal comparator circuit, making current protection reference circuit, making current protection On/Off circuit, logical “and” circuit, speed saturated circuit, dropout drive circuit, DC/DC generation ± VCC circuit, eating of described current transformer can the output of Paderewski coil be connected to integrating circuit, integrating circuit is connected to signal comparator circuit, the iron-core coil output of described current transformer is connected to fast saturated circuit, speed saturated circuit is connected to DC/DC generation ± VCC circuit, DC/DC generation ± VCC circuit is connected to making current protection reference circuit, described making current protection reference circuit is connected to signal comparator circuit, signal comparator circuit is connected to logical “and” circuit, logical “and” circuit is connected to dropout drive circuit, dropout drive circuit is connected to magnetic flow convertor, speed saturated circuit is connected to dropout drive circuit, circuit breaker closes, gate-dividing state signal is connected to making current protection On/Off circuit (MCR On/Off circuit), making current protection On/Off circuit is connected to logical “and” circuit, described DC/DC generation ± VCC circuit output ± VCC power supply, is respectively integrating circuit, signal comparator circuit, making current protection reference circuit, making current protection On/Off circuit, logical “and” circuit, dropout drive circuit provides power supply.Described in this patent, making current protection reference circuit protects On/Off circuit hereinafter to be referred as MCR On/Off circuit hereinafter to be referred as MCR reference circuit, making current.
A, B, C, N eat mutually can Paderewski current transformer the MCR reference voltage that produces with MCR reference circuit after the reduction of integrating circuit integration of output signal input operational amplifier is being just respectively, inverting input compares, comparison output signal input logic "AND" circuit, simultaneously, also input logic "AND" circuit of MCR On/Off circuit output signal, after two paths of signals logical “and”, input dropout drive circuit, if while running into the short circuit current that exceedes MCR action set point in breaker closing process, the signal of logical “and” output will trigger dropout drive circuit, make magnetic flow convertor action, afterwards circuit breaker quick acting switching-off.The iron core of A, B, C phase is transformer induced exports fast saturated circuit to, the dropout power supply that provides dropout drive circuit to need after rectification, pressure limiting, filtering, and DC/DC generation ± VCC power supply is provided.
Figure 2 shows that integrating circuit, in figure, only show to A eat mutually can Paderewski current transformer the circuit that reduces of output signal, owing to being identical to the integrating circuit of all the other phases, therefore omit.In Fig. 2, adopt passive RC integrating circuit, R1 is sample resistance, R2, C1 form integrating circuit, due to eat can Paderewski current transformer output resistance larger, therefore send into again signal comparator circuit after the mode that adopts the operational amplifier with high input impedance to follow output cushions isolation processing to signal.
Figure 3 shows that signal comparator circuit.Each input of A, B, the each phase signals of C, N operational amplifier N2, the N3 in difference input signal comparison circuit after integration reduction, positive and negative reference voltage V MCR+, the VMCR-that MCR reference circuit produces also inputs each input of corresponding operational amplifier, both compare, and last each operational amplifier exports logical “and” circuit to through four diode D1, D2 parallel connection.
Figure 4 shows that MCR reference circuit.+ VCC produces corresponding MCR action reference voltage by resistance R 9, R10 dividing potential drop, adopts operational amplifier to follow output and generates positive reference voltage VMCR+, then generate negative reference voltage V MCR-by the mode of anti-phase amplification.
Figure 5 shows that fast saturated circuit.A, B, C phase iron core current transformer are exported after rectifier diode D14 ~ D21 rectification, form direct voltage VP1 by capacitor C 22, C23 filtering, VP1 inputs on the one hand dropout drive circuit needed energy while dropout is provided, and inputs on the other hand DC/DC circuit generation ± VCC.For limit primary side current when larger iron core current transformer induction output energy cause more greatly VP1 too high, therefore adopt the mode of Voltage Feedback that VP1 is limited in to certain amplitude, be specially VP1 and produce stable voltage VS1 by resistance R 32, voltage-stabiliser tube VZ1, VS1 is used for the supply voltage of comparator N5A on the one hand, after resistance R 28, R31 dividing potential drop, be the pin 2 of N5A on the other hand again by the inverting input of resistance R 27 input comparator N5A, its voltage is the reference voltage of device output reversion as a comparison.VP1 is by resistance R 29, R30 dividing potential drop is the pin 3 of N5A again by the normal phase input end of resistance R 26 input comparator N5A, in the time that the voltage at N5A pin 3 places exceedes the voltage at pin 2 places, the output pin 1 of N5A produces high level, this level is applied to the G utmost point of metal-oxide-semiconductor V4, when the high level of G, make metal-oxide-semiconductor V4 conducting, afterwards make metal-oxide-semiconductor D pole tension reduce, further make VP1 lower voltage, finally make the voltage at N5A pin 3 places also reduce, when the voltage at N5A pin 3 places during lower than the voltage at pin 2 places comparator N5A output low level make metal-oxide-semiconductor V4 cut-off, metal-oxide-semiconductor V4 cut-off can make again VP1 voltage rise.So repeatedly, voltage VP1 is limited in certain amplitude range.
Figure 6 shows that DC/DC generation ± VCC circuit.From the voltage input DC/DC converter N6 generation+VCC of fast saturated circuit, again by DC/DC converter N8 generation-VCC.Comparator N5B opens DC/DC converter N6 for the voltage when from fast saturated circuit higher than default evaluation.
Figure 7 shows that the preferred MCR On/Off of the present embodiment circuit, the MCR On/Off circuit of realizing this function is not limited to the circuit that the present embodiment provides, and the circuit that can realize this function in prior art all can be used as the MCR On/Off circuit of this patent.The MCR On/Off circuit of the present embodiment comprises the first comparator N7B, the second comparator N7A, the first triode V5, the second triode V6, the first to the 12 resistance, the first to the 3rd electric capacity; The positive input of described the first comparator N7B is connected with circuit breaker on/off switch status signal output interface, and is connected with+VCC power supply by the first resistance R 58, by the first capacitor C 39 be connected; The output of described the first comparator N7B is connected, is connected with the base stage of the first triode V5 by the 3rd resistance R 18 with+VCC power supply by the second resistance R 17; The emitter of described the first triode V5 is connected with ground, and collector electrode passes through the 4th resistance R 56 and is connected with+VCC power supply, is connected with the base stage of the second triode V6 by the 5th resistance R 47, is connected the 6th resistance R 52 between the base stage of the first triode V5 and emitter; The emitter of described the second triode V6 is connected with+VCC power supply, the collector electrode of the second triode V6 is connected with one end of the 7th resistance R 53, the other end of described the 7th resistance R 53 is connected with ground through the second capacitor C 16, the 8th resistance R 48 respectively, is connected with the positive input of the second comparator N7A through the 9th resistance R 19; The tenth resistance R the 20, the 11 resistance R 21 of connecting successively between described+VCC power supply and ground, the node between described the tenth resistance R the 20, the 11 resistance R 21 is connected with the reverse input end of the first comparator N7B, the reverse input end of the second comparator N7A respectively; The output of described the second comparator N7A is connected with an input of logical “and” circuit, and is connected with+VCC power supply by the 12 resistance R 49; Between described+VCC power supply and ground, be connected the 3rd capacitor C 38.
The concrete principle of described MCR On/Off circuit and the course of work are as follows:
The closure of switch S 1 with disconnect corresponding to closure and the off-state of circuit breaker, and be designed to for example part second compared with the closed retarded closing reasonable time of contact of breaker T(as circuit breaker S1 from be disconnected to closing course).The course of work of whole circuit is such: circuit breaker is from being disconnected to closure, iron core current transformer induction output energy generation+VCC, because the power consumption of whole making current release circuit is quite low, therefore also very short (being for example the less than 10ms) time of the cost of generation+VCC, now switch S 1 is because closure T time of delay is also in off-state, be the approximate+VCC of level of the input pin 5 of comparator N7B, the level UCOMP of the input pin 6 of comparator N7B is by resistance R 20 by+VCC, R21 dividing potential drop produces, be smaller than+VCC of its value, therefore comparator N7B output high level, impel triode V5 conducting, its C after V5 conducting, between the E utmost point, pressure drop reduction makes triode V6 conducting, after triode V6 conducting, give capacitor C 16 quick charges through resistance R 53, along with the pressure drop at capacitor C 16 two ends raises fast, also fast rise thereupon of the voltage at input pin 3 places of comparator N7A, when its value exceedes the voltage U COMP at input pin 2 places of comparator N7A, comparator N7A exports high level, mean the unlatching of MCR protection actuating circuit.When through after time of delay T; switch S 1 closure; the level of the input pin 5 of comparator N7B equals with reference to ground, lower than the level UCOMP of the input pin 6 of comparator N7B, comparator N7B output low level; triode V5, V6 are ended respectively; the pressure drop fast reducing at capacitor C 16 two ends, also fast-descending thereupon of the voltage at input pin 3 places of comparator N7A, lower than the level UCOMP of the input pin 2 of comparator N7A; comparator N7A pin 1 output low level, MCR protection actuating circuit is closed.If after above-mentioned circuit breaker normally closed, S1 switch can be correspondingly closed so, and MCR protection actuating circuit is also just closed always.
Figure 8 shows that the preferred logical “and” circuit of the present embodiment, the logical “and” circuit of realizing this function is not limited to the circuit that the present embodiment provides, and the logical “and” circuit that can realize this function in prior art all can be used as the logical “and” circuit of this patent.The preferred logical “and” circuit of the present embodiment comprises optocoupler B1, the 3rd triode V1, the 13 to 15 resistance, the 4th capacitor C 14; Described optocoupler B1 input, output include first end, the second end; The first end 1 of described optocoupler input is connected with the output of signal comparator circuit by the 13 resistance R 15, and is connected with ground by the 4th capacitor C 14, and the second end 3 of described optocoupler input is connected with the collector electrode of the 3rd triode V1; The emitter of described the 3rd triode V1 is connected with ground, and the base stage of described the 3rd triode V1 is connected with the output of making current protection On/Off circuit by the 14 resistance R 16; Between the base stage of described the 3rd triode V1 and emitter, be connected the 15 resistance R 22; The first end 6 of described optocoupler B1 output is connected with+VCC power supply, and the second end 4 that described optocoupler B1 exports is connected with the input of dropout drive circuit.
Operation principle and the course of work of described logical “and” circuit are as follows:
If signal is relatively exported high level; and MCR protection action is opened and is made triode V1 conducting; and then make optocoupler B1 conducting output dropout drive signal; otherwise other any situation can not make optocoupler B1 conducting output thread off and drive signal, and therefore signal comparison output level and MCR On/Off circuit output level have formed the function of "AND" in logic.
Figure 9 shows that dropout drive circuit.The dropout power supply of magnetic flow convertor, from fast saturated circuit, makes triode V2, V3 conducting in succession in the time of logical “and” output circuit output high level, makes magnetic flow convertor quick acting.
Figure 10 is the another kind of form of the utility model integrating circuit.As shown in the figure, in figure, only show to A eat mutually can Paderewski current transformer the output signal circuit that carries out integration reduction, owing to being identical to the integrating circuit of all the other phases, therefore omit.In figure, adopt Active RC integrating circuit, R1 is sample resistance, and R2, R3, C1 and amplifier N1A form an active integrating network that gain is adjustable, and R4 is balance resistance.Eat and can Paderewski current transformer output signal send into again the operational amplifier in signal comparator circuit after integration reduction.
Claims (4)
1. a making current release, this release respectively with current transformer, circuit breaker on/off switch status signal output interface, magnetic flow convertor connects, described current transformer comprises that eat can Paderewski coil, iron-core coil, described making current release is characterized in that: comprise integrating circuit, signal comparator circuit, making current protection reference circuit, making current protection switch circuit, logical “and” circuit, speed saturated circuit, dropout drive circuit, DC/DC generation ± VCC circuit, eating of described current transformer can the output of Paderewski coil be connected to integrating circuit, integrating circuit is connected to signal comparator circuit, the iron-core coil output of described current transformer is connected to fast saturated circuit, speed saturated circuit is connected to DC/DC generation ± VCC circuit, DC/DC generation ± VCC circuit is connected to making current protection reference circuit, described making current protection reference circuit is connected to signal comparator circuit, signal comparator circuit is connected to logical “and” circuit, logical “and” circuit is connected to dropout drive circuit, dropout drive circuit is connected to magnetic flow convertor, speed saturated circuit is connected to dropout drive circuit, circuit breaker closes, gate-dividing state signal is connected to making current protection switch circuit, making current protection switch circuit is connected to logical “and” circuit, described DC/DC generation ± VCC circuit output ± VCC power supply, is respectively integrating circuit, signal comparator circuit, making current protection reference circuit, making current protection switch circuit, logical “and” circuit, dropout drive circuit provides power supply.
2. making current release according to claim 1, it is characterized in that: described making current protection On/Off circuit comprises the first comparator, the second comparator, the first triode, the second triode, the first to the 12 resistance, the first to the 3rd electric capacity; The positive input of described the first comparator is connected with circuit breaker, and is connected with+VCC power supply by the first resistance, by the first electric capacity be connected; The output of described the first comparator is connected, is connected with the base stage of the first triode by the 3rd resistance with+VCC power supply by the second resistance; The emitter of described the first triode is connected with ground, and collector electrode passes through the 4th resistance and is connected with+VCC power supply, is connected with the base stage of the second triode by the 5th resistance, is connected the 6th resistance between the base stage of the first triode and emitter; The emitter of described the second triode is connected with+VCC power supply, the collector electrode of the second triode is connected with one end of the 7th resistance, the other end of described the 7th resistance is connected with ground through the second electric capacity, the 8th resistance respectively, is connected with the positive input of the second comparator through the 9th resistance; Between described+VCC power supply and ground, connect successively the tenth resistance, the 11 resistance, the node between described the tenth resistance, the 11 resistance is connected with the reverse input end of the first comparator, the reverse input end of the second comparator respectively; The output of described the second comparator is connected with an input of logical “and” circuit, and is connected with+VCC power supply by the 12 resistance; Between described+VCC power supply and ground, be connected the 3rd electric capacity.
3. making current release according to claim 1 and 2, is characterized in that: described logical “and” circuit comprises optocoupler, the 3rd triode, the 13 to 15 resistance, the 4th electric capacity; Described optocoupler input, output include first end, the second end; The first end of described optocoupler input is connected with the output of signal comparator circuit by the 13 resistance, and is connected with ground by the 4th electric capacity, and the second end of described optocoupler input is connected with the collector electrode of the 3rd triode; The emitter of described the 3rd triode is connected with ground, and the base stage of described the 3rd triode is connected with the output of making current protection switch circuit by the 14 resistance; Between the base stage of described the 3rd triode and emitter, be connected the 15 resistance; The first end of described optocoupler output is connected with+VCC power supply, and the second end that described optocoupler is exported is connected with the input of dropout drive circuit.
4. making current release according to claim 1, is characterized in that: described integrating circuit comprises active integrating circuit or passive integrator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320864023.8U CN203632226U (en) | 2013-12-26 | 2013-12-26 | Switch-on current tripper |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320864023.8U CN203632226U (en) | 2013-12-26 | 2013-12-26 | Switch-on current tripper |
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| CN203632226U true CN203632226U (en) | 2014-06-04 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104659916A (en) * | 2015-02-02 | 2015-05-27 | 浙江正泰电器股份有限公司 | Signal integral circuit and intelligent circuit breaker controller |
| CN105337416A (en) * | 2015-11-19 | 2016-02-17 | 南京大全电气研究院有限公司 | Remote control circuit and remote control method of electronic type relay |
| CN108028528A (en) * | 2015-08-31 | 2018-05-11 | 伊顿智能动力有限公司 | Wide scope current monitoring system and method for electronic trip unit |
-
2013
- 2013-12-26 CN CN201320864023.8U patent/CN203632226U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104659916A (en) * | 2015-02-02 | 2015-05-27 | 浙江正泰电器股份有限公司 | Signal integral circuit and intelligent circuit breaker controller |
| CN108028528A (en) * | 2015-08-31 | 2018-05-11 | 伊顿智能动力有限公司 | Wide scope current monitoring system and method for electronic trip unit |
| CN108028528B (en) * | 2015-08-31 | 2019-12-27 | 伊顿智能动力有限公司 | Wide range current monitoring system and method for electronic trip units |
| CN105337416A (en) * | 2015-11-19 | 2016-02-17 | 南京大全电气研究院有限公司 | Remote control circuit and remote control method of electronic type relay |
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