CN103199486B - Low pressure and high voltage creepage protection circuit - Google Patents
Low pressure and high voltage creepage protection circuit Download PDFInfo
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- CN103199486B CN103199486B CN201310144928.2A CN201310144928A CN103199486B CN 103199486 B CN103199486 B CN 103199486B CN 201310144928 A CN201310144928 A CN 201310144928A CN 103199486 B CN103199486 B CN 103199486B
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Abstract
The present invention relates to technical field of electric equipment, be specifically related to a kind of low pressure and high voltage creepage protection circuit.This low-voltage leakage protection circuit, comprises A.C. contactor, auxiliary relay, adjustable resistance, control transformer, start button switch and stop button switch; The main contacts of A.C. contactor is arranged on the three phase transmission line of load-side; Each phase of three phase transmission line between main contacts with load is all connected an adjustable resistance, auxiliary relay and adjustable resistance connection in series-parallel; The absorbing coil of start button switch and A.C. contactor and stop button switch are connected in series afterwards and are connected to the secondary winding side of control transformer; The normally opened contact of auxiliary relay is connected in parallel on the both sides of start button switch after being connected in series successively with the self holding contact of A.C. contactor.This high voltage creepage protection circuit, also arranges electric capacity between phase line and adjustable resistance.Low pressure provided by the invention and high voltage creepage protection circuit, can make whole load-side power-off when there is electric leakage, playing a protective role.
Description
Technical field
The present invention relates to technical field of electric equipment, in particular to a kind of low pressure and high voltage creepage protection circuit.
Background technology
Earth leakage protective device, full name residual current operated protective device, is earth leakage circuit-breaker again, is mainly used for when equipment generation leak current fault, gets an electric shock protect there being the person of fatal risk.
Wherein, current mode leakage protector is widely used one in earth leakage protective device.It is using a part for zero-sequence current in circuit (being commonly referred to aftercurrent) as actuating signal, using electronic component as intermediary agency, makes power-off reaction to leaky.
The detecting element of current mode leakage protector is a zero sequence current mutual inductor; protected phase line, the neutral line are through ring-shaped core; constitute the primary winding of instrument transformer; the winding be wrapped on annular core constitutes the secondary coil of instrument transformer; if do not leak electricity generation; at this moment flow through phase line, the neutral line current vector and equal zero, therefore can not produce corresponding induced electromotive force on secondary coil.If there occurs electric leakage; the current vector of phase line, the neutral line and be not equal to zero; just make secondary coil produces induced electromotive force; this signal will be sent to intermediate link and be further processed; when this current value reaches the operating current value of this earth leakage protective device restriction; actuator receives the command signal of intermediate link, implements action, the power supply at automatic disengagement failure place.
Therefore; the detecting element of the current mode leakage protector in correlation technique; be whether zero judge whether to leak electricity by the electric current sum of the phase line of detection of grid side and the neutral line; and phase line and the neutral line are the power transmission lines of grid side; namely current mode leakage protector is installed on grid side; only can carry out earth leakage protective to primary side, to load end, whether electric leakage can not occur and detect and protect.
Summary of the invention
The object of the present invention is to provide a kind of low pressure and high voltage creepage protection circuit, to solve the above problems.
Provide a kind of low-voltage leakage protection circuit in an embodiment of the present invention, comprise A.C. contactor, the first auxiliary relay, the second auxiliary relay, the 3rd auxiliary relay, the first adjustable resistance, the second adjustable resistance, the 3rd adjustable resistance, control transformer, start button switch, stop button switch;
The main contacts of described A.C. contactor is arranged on the three phase transmission line of load-side;
Described main contacts is all connected an adjustable resistance with in each phase of the three phase transmission line between load, be respectively described first adjustable resistance, described second adjustable resistance and described 3rd adjustable resistance, the equal ground connection of the other end of described first adjustable resistance, described second adjustable resistance and described 3rd adjustable resistance;
Described first auxiliary relay, described second auxiliary relay and described 3rd auxiliary relay respectively with described first adjustable resistance, described second adjustable resistance and described 3rd adjustable resistance connection in series-parallel;
The absorbing coil of described start button switch and described A.C. contactor and described stop button switch are connected in series afterwards and are connected to the secondary winding side of described control transformer;
The both sides of described start button switch are connected in parallel on after first normally opened contact of described first auxiliary relay, the second normally opened contact of described second auxiliary relay and the 3rd normally opened contact of described 3rd auxiliary relay and the self holding contact of described A.C. contactor are connected in series successively.
Wherein, this low-voltage leakage protection circuit also comprises the first fuse;
Described first fuse is serially connected between the secondary winding side of described control transformer and described start button switch.
Wherein, this low-voltage leakage protection circuit also comprises the first indicator light, the second indicator light and the 3rd indicator light;
One end of described first indicator light is connected between described first normally opened contact and described second normally opened contact;
One end of described second indicator light is connected between described second normally opened contact and described 3rd normally opened contact;
One end of described 3rd indicator light is connected between described 3rd normally opened contact and described self holding contact;
The other end of described first indicator light, described second indicator light and described 3rd indicator light is all connected between described stop button switch and the absorbing coil of described A.C. contactor.
Wherein, the three phase transmission line of the grid side of described main contacts is also provided with plug-in fuse.
The present invention also discloses a kind of high voltage creepage protection circuit, comprises A.C. contactor, the first auxiliary relay, the second auxiliary relay, the 3rd auxiliary relay, the first adjustable resistance, the second adjustable resistance, the 3rd adjustable resistance, control transformer, start button switch, stop button switch, the first electric capacity, the second electric capacity and the 3rd electric capacity;
The main contacts of described A.C. contactor is arranged on the three phase transmission line of load-side;
Described main contacts is all connected an adjustable resistance with in each phase of the three phase transmission line between load, be respectively described first adjustable resistance, described second adjustable resistance and described 3rd adjustable resistance, the equal ground connection of the other end of described first adjustable resistance, described second adjustable resistance and described 3rd adjustable resistance;
One end of described first electric capacity, described second electric capacity and described 3rd electric capacity is connected on the three phase transmission line between described main contacts and load; Described first electric capacity, described second electric capacity are connected with one end of described first adjustable resistance, described second adjustable resistance and described 3rd adjustable resistance respectively with the other end of described 3rd electric capacity;
Described first auxiliary relay, described second auxiliary relay and described 3rd auxiliary relay respectively with described first adjustable resistance, described second adjustable resistance and described 3rd adjustable resistance connection in series-parallel;
The absorbing coil of described start button switch and described A.C. contactor and described stop button switch are connected in series afterwards and are connected to the secondary winding side of described control transformer, one end ground connection that described stop button switch is connected with described secondary winding side;
The both sides of described start button switch are connected in parallel on after first normally opened contact of described first auxiliary relay, the second normally opened contact of described second auxiliary relay and the 3rd normally opened contact of described 3rd auxiliary relay and the self holding contact of described A.C. contactor are connected in series successively.
Wherein, this high voltage creepage protection circuit also comprises the first fuse:
Described first fuse is serially connected between the secondary winding side of described control transformer and described start button switch.
Wherein, this high voltage creepage protection circuit also comprises the first indicator light, the second indicator light and the 3rd indicator light;
One end of described first indicator light is connected between described first normally opened contact and described second normally opened contact;
One end of described second indicator light is connected between described second normally opened contact and described 3rd normally opened contact;
One end of described 3rd indicator light is connected between described 3rd normally opened contact and described self holding contact;
The other end of described first indicator light, described second indicator light and described 3rd indicator light is all connected between described stop button switch and the absorbing coil of described A.C. contactor.
Wherein, this high voltage creepage protection circuit also comprises the first solid-state relay, the second solid-state relay and the 3rd solid-state relay;
One end in two inputs of described first solid-state relay through described first electric capacity phase-connecting wire, other end ground connection; One end in two outputs of described first solid-state relay connects described first adjustable resistance, and the other end is through described first auxiliary relay ground connection;
One end in two inputs of described second solid-state relay through described second electric capacity phase-connecting wire, other end ground connection; One end in two outputs of described second solid-state relay connects described second adjustable resistance, and the other end is through described second auxiliary relay ground connection;
One end in two inputs of described 3rd solid-state relay through described 3rd electric capacity phase-connecting wire, other end ground connection; One end in two outputs of described 3rd solid-state relay connects described 3rd adjustable resistance, and the other end is through described 3rd auxiliary relay ground connection.
Wherein, described first solid-state relay, the second solid-state relay and the 3rd solid-state relay are ac solid relay.
Wherein, the three phase transmission line of the grid side of described main contacts is also provided with high-tension fuse.
The low pressure of the above embodiment of the present invention and high voltage creepage protection circuit, ground connection after series resistor on the three phase transmission line of load-side, at resistor in parallel auxiliary relay, due to the phase electric leakage that electric leakage is in three-phase, detect so arrange three auxiliary relays, when there is electric leakage, one phase junction three-phase of electric leakage superposes, same frequency mutually owing to having one, phase angle is contrary, cannot coating-forming voltage poor, so this superimposed after the voltage at auxiliary relay two ends can be made not reach pickup value cause auxiliary relay to release electricity, the normally opened contact of auxiliary relay disconnects after a loss of power, make A.C. contactor power-off main contacts disconnection then, thus make whole load-side power-off, play a protective role.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of an embodiment of low-voltage leakage protection circuit of the present invention;
Fig. 2 is the circuit diagram of another embodiment of low-voltage leakage protection circuit of the present invention;
Fig. 3 is the circuit diagram of an embodiment of high voltage creepage protection circuit of the present invention.
Embodiment
Also by reference to the accompanying drawings the present invention is described in further detail below by specific embodiment.
Embodiment one
The embodiment of the present invention one provides a kind of low-voltage leakage protection circuit; shown in Figure 1, comprise A.C. contactor, the first auxiliary relay KA1, the second auxiliary relay KA2, the 3rd auxiliary relay KA3, the first adjustable resistance R1, the second adjustable resistance R2, the 3rd adjustable resistance R3, control transformer TC, start button switch S B1, stop button switch S B2.
Wherein, the main contacts KM1 of described A.C. contactor is arranged on the three phase transmission line of load-side.Main contacts KM1 is normally opened contact, is the master switch whether control load is energized.
Described main contacts KM1 is all connected an adjustable resistance with in each phase of the three phase transmission line between load, be respectively described first adjustable resistance R1, described second adjustable resistance R2 and described 3rd adjustable resistance R3, the equal ground connection of the other end of described first adjustable resistance R1, described second adjustable resistance R2 and described 3rd adjustable resistance R3.
Described first auxiliary relay KA1, described second auxiliary relay KA2 and described 3rd auxiliary relay KA3 respectively with described first adjustable resistance R1, described second adjustable resistance R2 and described 3rd adjustable resistance R3 connection in series-parallel, i.e. the first auxiliary relay KA1 and the first adjustable resistance R1 connection in series-parallel, second auxiliary relay KA2 and the second adjustable resistance R2 connection in series-parallel, the 3rd auxiliary relay KA3 and the 3rd adjustable resistance R3 connection in series-parallel.
The resistance of general adjustable resistance does not reach requirement, therefore, preferably, in each adjustable resistance connect a pressure limiting resistance, can not occur under normal circumstances like this electric leakage time, even if ensure ground wire is charged also can not more than 36V.
The absorbing coil of described start button switch S B1 and described A.C. contactor and described stop button switch S B2 are connected in series afterwards and are connected to the secondary winding side of described control transformer TC.
The both sides of described start button switch S B1 are connected in parallel on after first normally opened contact of described first auxiliary relay KA1, second normally opened contact of described second auxiliary relay KA2 and the 3rd normally opened contact of described 3rd auxiliary relay KA3 and the self holding contact km2 of described A.C. contactor are connected in series successively.
After pressing start button switch S B1, the absorbing coil energising of A.C. contactor and make often to open main contacts KM1 and self holding contact km2 and close, and then the first auxiliary relay KA1, the second auxiliary relay KA2 and the 3rd auxiliary relay KA3 obtain electric, normally opened contact KA1, KA2, KA3 of making each auxiliary relay corresponding are closed, KA1, KA2 and KA3 and km2 are all closed, then start button switch S B1 is of short duration closed and after disconnecting, and A.C. contactor also can continue electric.When there being one to leak electricity in three phase transmission line; so ground wire electrification of this phase; the voltage at auxiliary relay two ends corresponding in this phase is made not reach the pick-up voltage of relay; and make the contact of auxiliary relay cannot adhesive; thus normally opened contact KA1 or KA2 of correspondence or KA3 disconnects, thus make the absorbing coil dead electricity of A.C. contactor, and then main contacts KM1 disconnects; thus make whole load side electrical circuitry power-off, reach leakage protection.
Preferably, in order to prevent, the electric current of transformer secondary winding side is excessive burns device, and shown in Figure 2, this low-voltage leakage protection circuit also comprises the first fuse FU.
Described first fuse FU is serially connected between the secondary winding side of described control transformer TC and described start button switch S B1.Described fuse mainly plays overcurrent protection.
Preferably, in order to test the sensitivity of this leakage protection circuit, three indicator lights are also set.Shown in Figure 2, this low-voltage leakage protection circuit also comprises the first indicator light L1, the second indicator light L2 and the 3rd indicator light L3.
One end of described first indicator light L1 is connected between described first normally opened contact and described second normally opened contact; One end of described second indicator light L2 is connected between described second normally opened contact and described 3rd normally opened contact; One end of described 3rd indicator light L3 is connected between described 3rd normally opened contact and described self holding contact km2; The other end of described first indicator light L1, described second indicator light L2 and described 3rd indicator light L3 is all connected between described stop button switch S B2 and the absorbing coil of described A.C. contactor.
Above-mentioned leakage protection circuit, before use, should ensure auxiliary relay obtain electric after, its normally opened contact can respective action, namely should ensure by the enough pull-cores in magnetic field that the electric current of coil produces in auxiliary relay, otherwise electromotive force is too little then cannot adhesive.Therefore, arranging three indicator lights, is to regulate voltage levels ground wire being detected.If setting makes relay electric-loss when detecting voltage higher than 36V, so how we could set, and this just needs this three indicator lights.
By start button switch S B1 short circuit, the absorbing coil of A.C. contactor continues energising, main contacts KM1 closes, auxiliary relay obtains electric, now, if the voltage at auxiliary relay two ends reaches pick-up voltage value, then corresponding normally opened contact KA1 or KA2 or KA3 closes, corresponding indicator light L1, L2, L3 should be energized and light, if indicator light does not work, then illustrate that the normally opened contact of this auxiliary relay does not close, namely the voltage at auxiliary relay two ends does not reach pick-up voltage, even if energising also cannot make corresponding contact action, therefore leakage protection circuit is at this time cisco unity malfunction, need to adjust it.
Now; the resistance value of the adjustable resistance that adjustment is corresponding; because auxiliary relay is in parallel with adjustable resistance; therefore; the voltage that the change in voltage of adjustable resistance both sides also affects auxiliary relay both sides changes thereupon; when after the pick-up voltage reaching auxiliary relay, then corresponding indicator light lights, then this leakage protection circuit can normally use.
Whether three indicator lights that low-voltage leakage protection circuit of the present invention is arranged, effectively can protect leaky by regular event by testing circuit, enhance reliability and the validity of this circuit.
Preferably, the three phase transmission line of the grid side of described main contacts KM1 is also provided with plug-in fuse, overcurrent protection is carried out to the power transmission line at main contacts KM1 place.
It should be noted that; the device that the embodiment of the present invention one core improvement can be described is illustrate only in Fig. 1 and Fig. 2; and the devices such as not shown corresponding overcurrent protection, overload protection; those skilled in the art can be supplemented relevant safeguard measure by technical conceive according to the present invention, and the embodiment of the present invention one does not enumerate.
Embodiment two
The embodiment of the present invention two provides a kind of high voltage creepage protection circuit; shown in Figure 3, comprise A.C. contactor, the first auxiliary relay KA1, the second auxiliary relay KA2, the 3rd auxiliary relay KA3, the first adjustable resistance R1, the second adjustable resistance R2, the 3rd adjustable resistance R3, control transformer TC, start button switch S B1, stop button switch S B2, the first electric capacity C1, the second electric capacity C2 and the 3rd electric capacity C3.
Wherein, the description of the main contacts KM1 of described A.C. contactor and the first adjustable resistance R1, described second adjustable resistance R2 and described 3rd adjustable resistance R3 and described first auxiliary relay KA1, described second auxiliary relay KA2 and described 3rd auxiliary relay KA3 is see embodiment one, and the present embodiment repeats no more.
One end of described first electric capacity C1, described second electric capacity C2 and described 3rd electric capacity C3 is connected on the three phase transmission line between described main contacts KM1 and load; Described first electric capacity C1, described second electric capacity C2 are connected with one end of described first adjustable resistance R1, described second adjustable resistance R2 and described 3rd adjustable resistance R3 respectively with the other end of described 3rd electric capacity C3.
In high-tension circuit, if directly use resistance, so required resistance is too large, and cost is also high, so add an electric capacity before each adjustable resistance, so just can play step-down object.
Wherein, the size of electric capacity capacitive reactance should according to Xc=1/(2 π fC), select, should ensure that passed through electric current can make auxiliary relay can regular event.
The absorbing coil of described start button switch S B1 and described A.C. contactor and described stop button switch S B2 are connected in series afterwards and are connected to the secondary winding side of described control transformer TC, one end ground connection that described stop button switch S B2 is connected with described secondary winding side.
Equally, as as described in embodiment one, after first normally opened contact of described first auxiliary relay KA1, second normally opened contact of described second auxiliary relay KA2 and the 3rd normally opened contact of described 3rd auxiliary relay KA3 and the self holding contact km2 of described A.C. contactor are connected in series successively, be connected in parallel on the both sides of described start button switch S B1.
Equally, preferably, this high voltage creepage protection circuit also comprises the first fuse FU.Described first fuse FU is serially connected between the secondary winding side of described control transformer TC and described start button switch S B1.
Equally, in order to the voltage at the auxiliary relay two ends enabling this high voltage creepage protection circuit reaches pick-up voltage, the first indicator light L1, the second indicator light L2 and the 3rd indicator light L3 are also set.
One end of described first indicator light L1 is connected between described first normally opened contact and described second normally opened contact; One end of described second indicator light L2 is connected between described second normally opened contact and described 3rd normally opened contact; One end of described 3rd indicator light L3 is connected between described 3rd normally opened contact and described self holding contact km2; The other end of described first indicator light L1, described second indicator light L2 and described 3rd indicator light L3 is all connected between described stop button switch S B2 and the absorbing coil of described A.C. contactor.
The operation principle of indicator light is see described in embodiment one, and the present embodiment repeats no more.
If the electric current later by electric capacity is too little, sometimes cannot detect with auxiliary relay, because solid-state relay also can be reacted to small current signal, sensitivity is higher, uses solid-state relay to detect.So just can be implemented in the protection in high-tension circuit.Therefore, preferably, this high voltage creepage protection circuit also comprises the first solid-state relay SSR1, the second solid-state relay SSR2 and the 3rd solid-state relay SSR3.
One end in two inputs of described first solid-state relay SSR1 through described first electric capacity C1 phase-connecting wire, other end ground connection; One end in two outputs of described first solid-state relay SSR1 connects described first adjustable resistance R1, and the other end is through described first auxiliary relay KA1 ground connection.
One end in two inputs of described first solid-state relay SSR2 through described first electric capacity C2 phase-connecting wire, other end ground connection; One end in two outputs of described first solid-state relay SSR2 connects described first adjustable resistance R2, and the other end is through described first auxiliary relay KA2 ground connection.
One end in two inputs of described 3rd solid-state relay SSR3 through described first electric capacity C3 phase-connecting wire, other end ground connection; One end in two outputs of described first solid-state relay SSR3 connects described first adjustable resistance R3, and the other end is through described first auxiliary relay KA3 ground connection.
Described phase line, be a phase line in the three phase transmission line between described main contacts KM1 and load, a solid-state relay connects a phase line, and three solid-state relays are connected respectively with three phase lines one to one.
Preferably, described first solid-state relay, the second solid-state relay and the 3rd solid-state relay are ac solid relay.
The three phase transmission line of the grid side of described main contacts KM1 is also provided with high-tension fuse.
It should be noted that; the device that the embodiment of the present invention two core improvement can be described is illustrate only in Fig. 3; and the devices such as not shown corresponding overcurrent protection, overload protection; those skilled in the art can be supplemented relevant safeguard measure by technical conceive according to the present invention, and the embodiment of the present invention two does not enumerate.
This low-voltage leakage protection circuit and high voltage creepage protection circuit; three normally opened contacts of auxiliary relay are connected in the locked loop of main contacts KM1; auxiliary relay is only had to have electric adhesive that main contactor loop just can be made to carry out self-insurance and start; otherwise power transmission main contactor all can not self-insurance and discharging each time; its reliability is high; highly sensitive, can use in threephase load unbalanced circuit.
Its medium sensitivity is relevant with adjustable resistance size, if institute's resistance trimming value is just in time the voltage of relay adhesive, so sensitivity is just higher.If adjust the voltage of resistance value ratio relay high, sensitivity will reduce.So just can use different occasions.
Meanwhile, this circuit is with self-checking function, if core action component damages, so contactor just can not start.Further, those skilled in the art are known, and this circuit can carry out phase shortage and under-voltage protection.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a high voltage creepage protection circuit, it is characterized in that, comprise A.C. contactor, the first auxiliary relay, the second auxiliary relay, the 3rd auxiliary relay, the first adjustable resistance, the second adjustable resistance, the 3rd adjustable resistance, control transformer, start button switch, stop button switch, the first electric capacity, the second electric capacity and the 3rd electric capacity;
The main contacts of described A.C. contactor is arranged on the three phase transmission line of load-side;
Described main contacts is all connected an adjustable resistance with in each phase of the three phase transmission line between load, be respectively described first adjustable resistance, described second adjustable resistance and described 3rd adjustable resistance, the equal ground connection of the other end of described first adjustable resistance, described second adjustable resistance and described 3rd adjustable resistance;
One end of described first electric capacity, described second electric capacity and described 3rd electric capacity is connected on the three phase transmission line between described main contacts and load; Described first electric capacity, described second electric capacity are connected with one end of described first adjustable resistance, described second adjustable resistance and described 3rd adjustable resistance respectively with the other end of described 3rd electric capacity;
Described first auxiliary relay, described second auxiliary relay and described 3rd auxiliary relay respectively with described first adjustable resistance, described second adjustable resistance and described 3rd adjustable resistance connection in series-parallel;
The absorbing coil of described start button switch and described A.C. contactor and described stop button switch are connected in series afterwards and are connected to the secondary winding side of described control transformer, one end ground connection that described stop button switch is connected with described secondary winding side;
The both sides of described start button switch are connected in parallel on after first normally opened contact of described first auxiliary relay, the second normally opened contact of described second auxiliary relay and the 3rd normally opened contact of described 3rd auxiliary relay and the self holding contact of described A.C. contactor are connected in series successively;
Whether the main contacts of described A.C. contactor is normally opened contact, be energized for control load.
2. high voltage creepage protection circuit according to claim 1, is characterized in that, this high voltage creepage protection circuit also comprises the first fuse:
Described first fuse is serially connected between the secondary winding side of described control transformer and described start button switch.
3. high voltage creepage protection circuit according to claim 1, is characterized in that, this high voltage creepage protection circuit also comprises the first indicator light, the second indicator light and the 3rd indicator light;
One end of described first indicator light is connected between described first normally opened contact and described second normally opened contact;
One end of described second indicator light is connected between described second normally opened contact and described 3rd normally opened contact;
One end of described 3rd indicator light is connected between described 3rd normally opened contact and described self holding contact;
The other end of described first indicator light, described second indicator light and described 3rd indicator light is all connected between described stop button switch and the absorbing coil of described A.C. contactor.
4. high voltage creepage protection circuit according to claim 1, is characterized in that, this high voltage creepage protection circuit also comprises the first solid-state relay, the second solid-state relay and the 3rd solid-state relay;
One end in two inputs of described first solid-state relay through described first electric capacity phase-connecting wire, other end ground connection; One end in two outputs of described first solid-state relay connects described first adjustable resistance, and the other end is through described first auxiliary relay ground connection;
One end in two inputs of described second solid-state relay through described second electric capacity phase-connecting wire, other end ground connection; One end in two outputs of described second solid-state relay connects described second adjustable resistance, and the other end is through described second auxiliary relay ground connection;
One end in two inputs of described 3rd solid-state relay through described 3rd electric capacity phase-connecting wire, other end ground connection; One end in two outputs of described 3rd solid-state relay connects described 3rd adjustable resistance, and the other end is through described 3rd auxiliary relay ground connection.
5. high voltage creepage protection circuit according to claim 4, is characterized in that, described first solid-state relay, described second solid-state relay and described 3rd solid-state relay are ac solid relay.
6. the high voltage creepage protection circuit according to any one of claim 1-5, is characterized in that, the three phase transmission line of the grid side of described main contacts is also provided with high-tension fuse.
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| CN201310144928.2A CN103199486B (en) | 2013-04-24 | 2013-04-24 | Low pressure and high voltage creepage protection circuit |
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| CN201310144928.2A CN103199486B (en) | 2013-04-24 | 2013-04-24 | Low pressure and high voltage creepage protection circuit |
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| CN103199486B true CN103199486B (en) | 2016-04-06 |
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| CN109672430B (en) * | 2018-11-29 | 2022-12-27 | 杭州电子科技大学 | Three-phase alternating current solid-state relay circuit with leakage protection and wide voltage control |
| CN112968506A (en) * | 2021-04-09 | 2021-06-15 | 国网智慧能源交通技术创新中心(苏州)有限公司 | Direct current residual current protection device for charging and battery replacing equipment |
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| CN2071837U (en) * | 1990-07-14 | 1991-02-20 | 杨国贤 | Single phase open-phase protection device for three-phase motor |
| CN2305750Y (en) * | 1997-04-25 | 1999-01-27 | 谷耀军 | AC contactor phase-defect protector |
| CN203205826U (en) * | 2013-04-24 | 2013-09-18 | 郭永峰 | Low voltage and high voltage leakage protection circuits |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8659857B2 (en) * | 2008-07-24 | 2014-02-25 | Technology Reasearch Corporation | Leakage current detection and interruption circuit powered by leakage current |
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2013
- 2013-04-24 CN CN201310144928.2A patent/CN103199486B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2071837U (en) * | 1990-07-14 | 1991-02-20 | 杨国贤 | Single phase open-phase protection device for three-phase motor |
| CN2305750Y (en) * | 1997-04-25 | 1999-01-27 | 谷耀军 | AC contactor phase-defect protector |
| CN203205826U (en) * | 2013-04-24 | 2013-09-18 | 郭永峰 | Low voltage and high voltage leakage protection circuits |
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| CN103199486A (en) | 2013-07-10 |
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