CN212518380U - Three-phase power failure and leakage tripping switch - Google Patents
Three-phase power failure and leakage tripping switch Download PDFInfo
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- CN212518380U CN212518380U CN202021584224.9U CN202021584224U CN212518380U CN 212518380 U CN212518380 U CN 212518380U CN 202021584224 U CN202021584224 U CN 202021584224U CN 212518380 U CN212518380 U CN 212518380U
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Abstract
The utility model discloses a three-phase power failure and leakage tripping switch, wherein a three-phase rectifier output circuit, a high-low voltage direct current voltage back-flow prevention circuit after power failure and a high-low voltage direct current power output circuit are connected in series with a three-phase power output circuit, and the high-low voltage direct current power output circuit is connected with a power failure tripping positive voltage output switch circuit, a leakage tripping positive current amplification trigger circuit, a power failure tripping negative current amplification trigger circuit and a silicon controlled direct current high-voltage switch circuit and then is connected with a three-phase linkage tripping switch; the three-phase rectification output circuit is connected with the power failure tripping positive voltage output switch circuit, then is connected with the electric leakage tripping positive current amplification trigger circuit and the power failure tripping negative current amplification trigger circuit, then is connected with the anti-cross interference circuit, and then is connected with the silicon controlled direct current high-voltage switch circuit; the leakage tripping detection leakage inductance induction voltage output circuit is connected with the leakage tripping positive current amplification trigger circuit; the product has the dual-function integrated switch of power failure and leakage tripping, and ensures the safety of power utilization.
Description
Technical Field
The utility model relates to a switch circuit specifically is a three-phase power failure, electric leakage trip switch.
Background
The general factory installs the leakage switch in the branch distribution box or the main brake of the workshop, there is not the power failure tripping switch, the leakage switch of the factory is tripped and happens when the switch is blown out, the trip needs the electrician to detect the circuit and then resume the power supply or change the fuse and resume the power supply, the middle needs a certain time to resume the power supply, the workers who have some operation machines can leave the working post temporarily because of the power failure or the leakage trip, the machines do not completely shut off the power, the automatic work after some machines resume the power supply, and the workers are not on post, can cause the mechanical failure, even can take place the unpredictable dangerous situation, therefore, need to develop and is suitable for installing the machines, can be suitable for a three-phase power failure, tripping switch of the leakage line of the main circuit or the branch.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a three-phase power failure, electric leakage trip switch with electric leakage, power failure trip-out dual function.
The scheme for solving the technical problems is as follows:
a three-phase power failure and leakage tripping switch comprises a three-phase power supply input circuit, a three-phase linkage tripping switch, a leakage tripping detection leakage inductance induction voltage output circuit and a three-phase power supply output circuit, wherein the three-phase power supply input circuit is connected with the three-phase linkage tripping switch, the three-phase linkage tripping switch is connected with the leakage tripping detection leakage inductance induction voltage output circuit, the leakage tripping detection leakage inductance induction voltage output circuit is connected with the three-phase power supply output circuit, the three-phase power supply output circuit is connected with a three-phase rectification output circuit, the three-phase rectification output circuit is connected with a high-low voltage direct current voltage reverse current prevention circuit after power failure, the high-low voltage direct current voltage reverse current prevention circuit is connected with a high-low voltage direct current power supply output circuit, the high-low voltage direct current power supply output circuit is connected with a power failure tripping positive voltage output switch circuit, a leakage tripping positive current amplification trigger, The thyristor direct-current high-voltage switch circuit is connected with the three-phase linkage tripping switch; the three-phase rectification output circuit is connected with the power failure tripping positive voltage output switch circuit, the power failure tripping positive voltage output switch circuit is connected with the electric leakage tripping positive current amplification trigger circuit and the power failure tripping negative current amplification trigger circuit, the electric leakage tripping positive current amplification trigger circuit and the power failure tripping negative current amplification trigger circuit are connected with an anti-crosstalk circuit, and the anti-crosstalk circuit is connected with the silicon controlled direct current high-voltage switch circuit; and the electric leakage tripping detection electric leakage induction voltage output circuit is connected with the electric leakage tripping positive current amplification trigger circuit.
The preferable technical scheme is further as follows: the three-phase power supply output circuit comprises three alternating current output live wires L11, L21 and L31;
the three-phase rectification output circuit comprises a diode D5, a diode D6 and a diode D7, wherein the anode of the diode D5 is connected with a live wire L31, the anode of the diode D6 is connected with a live wire L21, and the anode of the diode D7 is connected with a live wire L11; and the negative electrode of the diode D5, the negative electrode of the diode D6 and the negative electrode of the diode D7 are connected with a circuit for preventing high-low voltage direct current voltage from reversing after power failure and a circuit for preventing positive voltage output switch from tripping in power failure.
The preferable technical scheme is further as follows: the circuit for preventing the high-low voltage direct current voltage from falling after power failure comprises a diode D4 and a current-limiting resistor R10, wherein the anode of a diode D4 is connected with the cathode of a diode D5, the cathode of a diode D6 and the cathode of a diode D7, the cathode of a diode D4 is connected with one end of a resistor R10, and the other end of the resistor R10 is connected with a high-low voltage direct current power supply output circuit and a three-phase linkage tripping switch.
The preferable technical scheme is further as follows: the high-low voltage direct current power supply output circuit comprises a capacitor C6, a resistor R6, a resistor R7, a resistor R8 and a voltage stabilizing diode W3, wherein the other end of the resistor R10 is connected with the anode of the capacitor C6, the resistor R7 and the resistor R8, the resistor R7 and the resistor R6 are connected to two ends of the capacitor C6 after being connected in series, two ends of the resistor R6 are connected with a voltage stabilizing diode W3 in parallel, the cathode of the voltage stabilizing diode W3 is connected with one end of the resistor R7 and one end of the resistor R6, the anode of the voltage stabilizing diode W3, the cathode of the capacitor C6 and the other end of the resistor R6 are connected with a circuit zero line E; one end of the resistor R8 is connected with the positive electrode of the capacitor C6, and the other end is connected with the negative electrode of the capacitor C6 and the circuit zero line E.
The preferable technical scheme is further as follows: the power failure tripping positive voltage output switch circuit comprises a current-limiting resistor R4, a capacitor C5, a voltage stabilizing diode W2 and a photoelectric switch EDK; one end of the resistor R4 is connected with the cathode of the diode D5, the diode D6 and the diode D7, the other end of the resistor R4 is connected with one end of the capacitor C5, the cathode of the voltage stabilizing diode W2 and the pin 1 of the photoelectric switch EDK, and the other end of the capacitor C5, the anode of the voltage stabilizing diode W2 and the pin 2 of the photoelectric switch EDK are connected with the zero line E of the circuit; and the 3 pins of the photoelectric switch EDK are connected with the cathode of the voltage stabilizing diode W3, one end of the resistor R6 and one end of the resistor R7.
The preferable technical scheme is further as follows: the positive current amplification trigger circuit for the leakage tripping comprises an NPN triode, a resistor R3, a resistor R11, a voltage stabilizing diode W1 and a capacitor C4, and forms a positive control current amplification circuit, the NPN triode is used as a current amplifier and comprises a b pole, an E pole and a C pole, the b pole of the NPN triode is connected with one end of the capacitor C4, the negative pole of the voltage stabilizing diode W1, one end of the resistor R3 and one end of the resistor R11, and the positive pole of the voltage stabilizing diode W1, the other end of the capacitor C4 and the other end of the resistor R3 are connected with a zero line E point of the circuit; one end of the resistor R11 is connected with the b pole of the NPN triode, and the other end of the resistor R11 is connected with the leakage tripping detection leakage inductance voltage output circuit;
the e pole of the NPN triode is connected with the anti-crosstalk circuit;
the c pole of the NPN triode is connected with the 4 pins of the photoelectric switch EDK;
the power failure tripping negative current amplification trigger circuit comprises a PNP triode, a resistor R1, a resistor R2, a diode D1, a capacitor C2 and a capacitor C3, and the PNP triode, the resistor R1, the resistor R2, the diode D1, the capacitor C2 and the capacitor C3 form a negative control current amplification circuit; the PNP triode comprises a b pole, an e pole and a c pole; the 4-pin of the photoelectric switch EDK is connected with one end of a resistor R1, a resistor R2, a capacitor C3 and the anode of a diode D1, and the other end of the resistor R1 is connected with the b pole of the PNP triode;
the negative electrode of the diode D1 is connected with one end of the capacitor C2 and the e pole of the PNP triode;
the other ends of the capacitor C2, the resistor R2 and the capacitor C3 are connected with a circuit zero line E;
and the c electrode of the PNP triode is connected with the anti-crosstalk circuit.
The preferable technical scheme is further as follows: the anti-crosstalk circuit comprises a diode D2 and a diode D3, wherein the anode of the diode D2 is connected with the c pole of the PNP triode, and the anode of the diode D3 is connected with the e pole of the NPN triode; the cathodes of the diode D2 and the diode D3 are connected with a thyristor direct-current high-voltage switch circuit.
The preferable technical scheme is further as follows: the silicon controlled direct-current high-voltage switching circuit consists of a silicon controlled BT1 and a capacitor C1, and the silicon controlled BT1 comprises a G pole, a K pole and an A pole; the G pole of the controlled silicon BT1 is connected with the negative pole of a diode D2, the negative pole of a diode D3 and one end of a capacitor C1, and the other end of the capacitor C1 is connected with a circuit zero line E; the K pole of the controlled silicon BT1 is connected with a zero line E of the circuit, and the negative pole of the capacitor C6 is connected with the K pole of the controlled silicon BT 1; the A pole connection of the controllable silicon BT1 is connected with a three-phase linkage tripping switch.
The preferable technical scheme is further as follows: the leakage current tripping inspection leakage current induction voltage output circuit comprises a voltage induction magnetic ring TE, a leakage current inspection coil TA, a voltage induction coil TC, a leakage current inspection switch K4 and a resistor R5;
the live wires L11, L21 and L31 penetrate through the voltage induction magnetic ring TE; the electric leakage detection coil TA is wound on the voltage induction magnetic ring TE; the voltage induction coil TC is wound on the voltage induction magnetic ring TE; the voltage induction coil TC is relatively positioned at the other end, far away from the electric leakage detection coil TA;
one end of the leakage detection switch K4 is connected with a live wire L21, the other end of the leakage detection switch K4 is connected with one end of a leakage detection coil TA, the other end of the leakage detection coil TA is connected with one end of a resistor R5, and the other end of the resistor R5 is connected with a live wire L11;
one end of the voltage induction coil TC is connected with a resistor R11, the other end of the voltage induction coil TC is connected with a circuit zero line E and the anodes of a diode D8, a diode D9 and a diode D10, the cathode of the diode D8 is connected with a live wire L11, the cathode of the diode D9 is connected with a live wire L21, and the cathode of the diode D10 is connected with a live wire L31; the diode D5, the diode D6, the diode D7, the diode D8, the diode D9 and the diode D10 form a three-phase full-wave rectification circuit.
The preferable technical scheme is further as follows: the three-phase linkage tripping switch is a tripping linkage device QP; the tripping interlocking device QP comprises an interlocking switch K1, an interlocking switch K2, an interlocking switch K3, a tripping electromagnetic coil VH, an overload electromagnetic coil AH, an overload electromagnetic coil BH and an overload electromagnetic coil CH; the three-phase power supply input circuit comprises three alternating current input live wires L1, L2 and L3, and the three alternating current input live wires L11, L21 and L31 correspond to the three alternating current output live wires one by one; one end of the linkage switch K1 is correspondingly connected with a live wire L1, the other end of the linkage switch K1 is connected with an overload electromagnetic coil AH, and the other end of the overload electromagnetic coil AH is connected with a live wire L11; one end of the linkage switch K2 is correspondingly connected with a live wire L2, the other end of the linkage switch K2 is connected with an overload electromagnetic coil BH, and the other end of the overload electromagnetic coil BH is connected with a live wire L21; one end of the linkage switch K3 is correspondingly connected with a live wire L3, the other end of the linkage switch K3 is connected with an overload electromagnetic coil CH, and the other end of the overload electromagnetic coil CH is connected with a live wire L31; one end of the tripping electromagnetic coil VH is connected with a resistor R10, a capacitor C6, a resistor R7 and a resistor R8, and the other end of the tripping electromagnetic coil VH is connected with an A pole of a thyristor BT 1; the tripping electromagnetic coil VH is connected with the overload electromagnetic coil AH, the overload electromagnetic coil BH, the overload electromagnetic coil CH, the linkage switch K1, the linkage switch K2 and the linkage switch K3 in an integral magnetic induction mode.
The utility model discloses a three-phase power failure, electric leakage trip switch beneficial effect do: this three phase current has a power failure, the electric leakage trip switch is applicable to every mill, the enterprise, national grid equipment, three-phase mechanical equipment etc., this three phase current has a power failure is installed to the consumer after the power inlet wire, the electric leakage trip switch, if because of having a power failure suddenly, three phase current has a power failure trip switch can automatic trip immediately, also can not be switched on when resumeing the power supply, can cut off like this because of having a power failure suddenly forget various electrics of shutting down, machinery, the power supply of power supply line, protect property safety, when will use the power supply, through artificial resume operation three phase current has a power failure again, the electric leakage trip switch circular telegram, finally use electrical equipment or power supply equipment to obtain the power, safe power consumption under. If when the electric leakage happens suddenly during the power utilization, the switch can automatically and immediately trip, so that the power utilization caused by the sudden electric leakage can be cut off, personal safety and property safety are protected, when the electrical equipment is used, the power failure is recovered through manual operation, the electric leakage trip switch is electrified, the electrical equipment is finally used to obtain a power supply, and the electrical equipment is used under the condition of someone. The product has two composite dual-function integrated switches of power failure tripping and leakage tripping.
Drawings
Fig. 1 is a circuit block diagram of the non-electric leakage trip switch of the product of the present invention;
FIG. 2 is a schematic circuit diagram of the non-electric leakage trip switch of the present invention;
fig. 3 is a circuit schematic diagram of the electroless leakage trip switch of the product of the utility model.
The power failure detection system comprises a three-phase power supply input circuit 1, a three-phase linkage tripping switch 2, a leakage tripping detection leakage induction voltage output circuit 3, a three-phase power supply output circuit 4, a three-phase rectification output circuit 5, a high-low voltage direct current voltage back-flow prevention circuit 6 after power failure, a high-low voltage direct current power supply output circuit 7, a power failure tripping positive voltage output switch circuit 8, a leakage tripping positive current amplification trigger circuit 9, a power failure tripping negative current amplification trigger circuit 10, an anti-series interference circuit 11 and a silicon controlled direct current high voltage switch circuit 12.
Detailed Description
A three-phase power failure and leakage tripping switch comprises a three-phase power supply input circuit 1, a three-phase linkage tripping switch 2, a leakage tripping detection leakage induction voltage output circuit 3 and a three-phase power supply output circuit 4, wherein the three-phase power supply input circuit 1 is connected with the three-phase linkage tripping switch 2, the three-phase linkage tripping switch 2 is connected with the leakage tripping detection leakage induction voltage output circuit 3, the leakage tripping detection leakage induction voltage output circuit 3 is connected with the three-phase power supply output circuit 4, the three-phase power supply output circuit 4 is connected with a three-phase rectification output circuit 5, the three-phase rectification output circuit 5 is connected with a high-low voltage direct current voltage back-off preventing circuit 6 after power failure, the high-low voltage direct current voltage back-off preventing circuit 6 after power failure is connected with a high-low voltage direct current power supply output circuit 7, and the high-low voltage direct current power supply output circuit 7 is connected, The three-phase interlocking tripping device comprises a leakage tripping positive current amplification trigger circuit 9, a power failure tripping negative current amplification trigger circuit 10 and a silicon controlled direct current high-voltage switch circuit 12, wherein the silicon controlled direct current high-voltage switch circuit 12 is connected with a three-phase interlocking tripping switch 2; the three-phase rectification output circuit 5 is connected with a power failure tripping positive voltage output switch circuit 8, the power failure tripping positive voltage output switch circuit 8 is connected with a current leakage tripping positive current amplification trigger circuit 9 and a power failure tripping negative current amplification trigger circuit 10, the current leakage tripping positive current amplification trigger circuit 9 and the power failure tripping negative current amplification trigger circuit 10 are connected with an anti-crosstalk circuit 11, and the anti-crosstalk circuit 11 is connected with a silicon controlled direct current high-voltage switch circuit 12; the leakage tripping detection leakage induction voltage output circuit 3 is connected with a leakage tripping positive current amplification trigger circuit 9.
The preferable technical scheme is further as follows: the three-phase power output circuit 4 comprises three alternating current output live wires L11, L21 and L31;
the three-phase rectification output circuit 5 comprises a diode D5, a diode D6 and a diode D7, wherein the anode of the diode D5 is connected with a live wire L31, the anode of the diode D6 is connected with a live wire L21, and the anode of the diode D7 is connected with the live wire L11; and the negative electrode of the diode D5, the negative electrode of the diode D6 and the negative electrode of the diode D7 are connected with the high-low voltage direct current voltage reverse current prevention circuit 6 and the power failure tripping positive voltage output switch circuit 8 after power failure.
The preferable technical scheme is further as follows: the circuit 6 for preventing the high-low voltage direct current voltage from falling comprises a diode D4 and a current-limiting resistor R10, wherein the anode of the diode D4 is connected with the cathode of the diode D5, the cathode of the diode D6 and the cathode of the diode D7, the cathode of the diode D4 is connected with one end of the resistor R10, and the other end of the resistor R10 is connected with the high-low voltage direct current power supply output circuit 7 and the three-phase linkage tripping switch 2.
The preferable technical scheme is further as follows: the high-low voltage direct current power supply output circuit 7 comprises a capacitor C6, a resistor R6, a resistor R7, a resistor R8 and a voltage stabilizing diode W3, wherein the other end of the resistor R10 is connected with the anode of the capacitor C6, the resistor R7 and the resistor R8, the resistor R7 and the resistor R6 are connected in series and then connected to two ends of the capacitor C6, two ends of the resistor R6 are connected with a voltage stabilizing diode W3 in parallel, the cathode of the voltage stabilizing diode W3 is connected with one end of the resistor R7 and one end of the resistor R6, and the anode of the voltage stabilizing diode W3, the cathode of the capacitor C6 and the other end of the resistor R6 are connected with a circuit zero line E; one end of the resistor R8 is connected with the positive electrode of the capacitor C6, and the other end is connected with the negative electrode of the capacitor C6 and a circuit zero line E; the capacitor C6 is stable in voltage and is not damaged by overhigh external voltage, the resistor R8 is a shunt resistor of the capacitor C6, the resistor R6, the resistor R7 and the voltage stabilizing diode W3 form weak current direct current (for example, 5V voltage), the anodes of the diode D8, the diode D9 and the diode D10 obtain three-phase high-voltage direct-current negative voltage, the three-phase high-voltage direct-current negative voltage is connected with a circuit zero line E, three-phase high-voltage direct-current positive voltage is output from the cathodes of the diode D5, the diode D6 and the diode D7 and is connected with the diode D4, the cathode of the diode D4 is connected with one end of a resistor R10, the other end of the resistor R10 is connected with one end of a tripping electromagnetic coil VH and a capacitor C6, a resistor R7 and a resistor R8, the connection point of the resistor R10 has high-voltage direct-current positive voltage, the high-voltage direct-current positive, the energy power which is automatically tripped after overload or short circuit, electric leakage and power failure of the load is acted.
The preferable technical scheme is further as follows: the power failure tripping positive voltage output switch circuit 8 comprises a current-limiting resistor R4, a capacitor C5, a voltage stabilizing diode W2 and a photoelectric switch EDK; one end of the resistor R4 is connected with the cathode of the diode D5, the diode D6 and the diode D7, the other end of the resistor R4 is connected with one end of the capacitor C5, the cathode of the voltage stabilizing diode W2 and the pin 1 of the photoelectric switch EDK, and the other end of the capacitor C5, the anode of the voltage stabilizing diode W2 and the pin 2 of the photoelectric switch EDK are connected with the zero line E of the circuit; and the 3 pins of the photoelectric switch EDK are connected with the cathode of the voltage stabilizing diode W3, one end of the resistor R6 and one end of the resistor R7.
The preferable technical scheme is further as follows: the leakage tripping positive current amplification trigger circuit 9 comprises an NPN triode, a resistor R3, a resistor R11, a voltage stabilizing diode W1 and a capacitor C4, and forms a positive control current amplification circuit, the NPN triode is used as a current amplifier, the NPN triode comprises a b pole, an E pole and a C pole, the b pole of the NPN triode is connected with one end of the capacitor C4, the negative pole of the voltage stabilizing diode W1, one end of the resistor R3 and one end of the resistor R11, the positive pole of the voltage stabilizing diode W1, the other end of the capacitor C4 and the other end of the resistor R3 are connected with a zero line E point of the circuit; one end of the resistor R11 is connected with the b pole of the NPN triode, and the other end of the resistor R11 is connected with the leakage tripping detection leakage inductance voltage output circuit 3;
the e pole of the NPN triode is connected with the anti-crosstalk circuit 11;
the c pole of the NPN triode is connected with the 4 pins of the photoelectric switch EDK;
the power failure tripping negative current amplification trigger circuit 10 comprises a PNP triode, a resistor R1, a resistor R2, a diode D1, a capacitor C2 and a capacitor C3, and the PNP triode, the resistor R1, the resistor R2, the diode D1, the capacitor C2 and the capacitor C3 form a negative control current amplification circuit; the PNP triode comprises a b pole, an e pole and a c pole; the 4-pin of the photoelectric switch EDK is connected with one end of a resistor R1, a resistor R2, a capacitor C3 and the anode of a diode D1, and the other end of the resistor R1 is connected with the b pole of the PNP triode;
the negative electrode of the diode D1 is connected with one end of the capacitor C2 and the e pole of the PNP triode;
the other ends of the capacitor C2, the resistor R2 and the capacitor C3 are connected with a circuit zero line E;
and the c pole of the PNP triode is connected with the anti-crosstalk circuit 11.
The preferable technical scheme is further as follows: the anti-crosstalk circuit 11 comprises a diode D2 and a diode D3, wherein the anode of the diode D2 is connected with the c pole of the PNP triode, and the anode of the diode D3 is connected with the e pole of the NPN triode; the cathodes of the diode D2 and the diode D3 are connected with the thyristor direct-current high-voltage switch circuit 12.
The preferable technical scheme is further as follows: the thyristor direct-current high-voltage switch circuit 12 consists of a thyristor BT1 and a capacitor C1, and the thyristor BT1 comprises a G pole, a K pole and an A pole; the G pole of the controlled silicon BT1 is connected with the negative pole of a diode D2, the negative pole of a diode D3 and one end of a capacitor C1, and the other end of the capacitor C1 is connected with a circuit zero line E; the K pole of the controlled silicon BT1 is connected with a zero line E of the circuit, and the negative pole of the capacitor C6 is connected with the K pole of the controlled silicon BT 1; the A pole connection of the controllable silicon BT1 is connected with a three-phase linkage tripping switch 2.
The preferable technical scheme is further as follows: the electric leakage tripping detection electric leakage induction voltage output circuit 3 comprises a voltage induction magnetic ring TE, an electric leakage detection coil TA, a voltage induction coil TC, an electric leakage detection switch K4 and a resistor R5;
the live wires L11, L21 and L31 penetrate through the voltage induction magnetic ring TE; the electric leakage detection coil TA is wound on the voltage induction magnetic ring TE; the voltage induction coil TC is wound on the voltage induction magnetic ring TE; the voltage induction coil TC is relatively positioned at the other end, far away from the electric leakage detection coil TA;
one end of the leakage detection switch K4 is connected with a live wire L21, the other end of the leakage detection switch K4 is connected with one end of a leakage detection coil TA, the other end of the leakage detection coil TA is connected with one end of a resistor R5, and the other end of the resistor R5 is connected with a live wire L11;
one end of the voltage induction coil TC is connected with a resistor R11, the other end of the voltage induction coil TC is connected with a circuit zero line E and the anodes of a diode D8, a diode D9 and a diode D10, the cathode of the diode D8 is connected with a live wire L11, the cathode of the diode D9 is connected with a live wire L21, and the cathode of the diode D10 is connected with a live wire L31; the diode D5, the diode D6, the diode D7, the diode D8, the diode D9 and the diode D10 form a three-phase full-wave rectification circuit.
The preferable technical scheme is further as follows: the three-phase linkage tripping switch 2 is a tripping linkage device QP; the tripping interlocking device QP comprises an interlocking switch K1, an interlocking switch K2, an interlocking switch K3, a tripping electromagnetic coil VH, an overload electromagnetic coil AH, an overload electromagnetic coil BH and an overload electromagnetic coil CH; the three-phase power input circuit 1 comprises three alternating current input live wires L1, L2 and L3, and the three alternating current input live wires L11, L21 and L31 correspond to the three alternating current output live wires one by one; one end of the linkage switch K1 is correspondingly connected with a live wire L1, the other end of the linkage switch K1 is connected with an overload electromagnetic coil AH, and the other end of the overload electromagnetic coil AH is connected with a live wire L11; one end of the linkage switch K2 is correspondingly connected with a live wire L2, the other end of the linkage switch K2 is connected with an overload electromagnetic coil BH, and the other end of the overload electromagnetic coil BH is connected with a live wire L21; one end of the linkage switch K3 is correspondingly connected with a live wire L3, the other end of the linkage switch K3 is connected with an overload electromagnetic coil CH, and the other end of the overload electromagnetic coil CH is connected with a live wire L31; one end of the tripping electromagnetic coil VH is connected with a resistor R10, a capacitor C6, a resistor R7 and a resistor R8, and the other end of the tripping electromagnetic coil VH is connected with an A pole of a thyristor BT 1; the tripping electromagnetic coil VH is connected with the overload electromagnetic coil AH, the overload electromagnetic coil BH, the overload electromagnetic coil CH, the linkage switch K1, the linkage switch K2 and the linkage switch K3 in an integral magnetic induction mode.
As shown in fig. 3: the other technical scheme of the high-low voltage direct current power supply output circuit is as follows: the high-low voltage direct current power supply output circuit comprises a capacitor C6, a capacitor C7, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a voltage stabilizing diode W3, wherein the other end of the resistor R10 is connected with the anode of the capacitor C6, a resistor R7 and a resistor R8; the capacitor C6 and the capacitor C7 are connected in series; the resistor R8 and the resistor R9 are connected in series; one end of the resistor R8 is connected to the positive electrode of the capacitor C6, and the other end of the resistor R8 is connected between the negative electrode of the capacitor C6 and the positive electrode of the capacitor C7; one end of the resistor R9 is connected between the negative electrode of the capacitor C6 and the positive electrode of the capacitor C7, and the other end of the resistor R9 is connected with the negative electrode of the capacitor C7; after the resistor R7 and the resistor R6 are connected in series, the resistor R7 is connected to the anode of the capacitor C6, and the resistor R6 is connected with the cathode of the capacitor C7; the two ends of the resistor R6 are connected with a voltage stabilizing diode W3 in parallel, the negative electrode of the voltage stabilizing diode W3 is connected with one ends of the resistor R7 and the resistor R6, and the positive electrode of the voltage stabilizing diode W3, the negative electrode of the capacitor C7, the other ends of the resistor R6 and the resistor R9 are connected with a circuit zero line E; the capacitor C6 and the capacitor C7 are connected in series to form a composite capacitor, the capacitor voltage is improved, and the capacitor is not damaged by overhigh external voltage, the resistor R8 and the resistor R9 are shunt resistors of the capacitor C6 and the capacitor C7, the voltages of two ends of the capacitor C6 and the capacitor C7 are close to the same after being connected in series, the resistor R6, the resistor R7 and the voltage stabilizing diode W3 form weak current direct current (for example, 5V voltage), the positive electrodes of the diode D8, the diode D9 and the diode D10 obtain high-voltage direct current negative voltage of three-phase power, the high-voltage direct current negative voltage is connected with a circuit zero line E, high-voltage direct current positive voltage of the three-phase power is output from the negative electrodes of the diode D5, the diode D6 and the diode D7 and is connected with the diode D4, the negative electrode of the diode D4 is connected with one end of the resistor 573R 5, the other end of the resistor R58, The resistor R7 and the resistor R8 are connected, the high-voltage direct current positive voltage is arranged at the connection point of the resistor R10 and is stored by the capacitor C6 and the capacitor C7, and the high-voltage direct current electric energy stored by the capacitor C6 and the capacitor C7 provides a tripping electromagnetic coil VH and acts on energy power for automatic tripping after load overload or short circuit, electric leakage and power failure.
The A pole of the controllable silicon BT1 is an anode, the K pole is a cathode, and the G pole is a trigger pole.
The electrode e of the PNP triode is an emitting electrode, the electrode c is a collecting electrode, and the electrode b is a base electrode.
The three-phase power input circuit is an alternating current input circuit, the power input circuit enters when electricity exists, the three-phase linkage tripping switch is in a composite closed state, voltage output exists on three live wires of the three-phase power output circuit, high-voltage direct current voltage exists at two ends of the capacitor C6, and the high-voltage direct current voltage is output through the silicon controlled BT1 to control the three-phase linkage tripping switch to be tripped during power failure, so that instant electric energy is provided.
When the live wires L11, L21 and L31 have output voltages, the resistor R4 has direct-current voltage to pass through, the voltage-stabilizing diode W2 and the resistor R4 are connected in series to be used at higher voltage, the higher stable voltage can be obtained by connecting in series, the value of the direct-current voltage depends on the voltage-stabilizing tubes of the resistor R4 and the voltage-stabilizing diode W2, and the voltage of the resistor R4 can be stabilized by the capacitor C5; the photoelectric switch EDK works to conduct the 3 pins and the 4 pins, and outputs positive direct current low voltage (for example, 5 volts), the direct current low voltage is composed of a resistor R7, a resistor R6 and a voltage stabilizing diode W3, the resistor R7, the resistor R6 and the voltage stabilizing diode W3 form weak current direct current voltage (for example, 5 volts), the resistor R7 and the resistor R6 are connected to two ends of a capacitor C6 after being connected in series, the resistor R6 has a voltage, the two ends of the resistor R6 are connected with the voltage stabilizing diode W3 in parallel, the voltage at two ends of the resistor R6 is stabilized at the direct current low voltage (for example, 5 volts), and the voltage provides power failure tripping operation; the capacitor C6 is a high-voltage energy storage capacitor; the resistor R8 is a shunt resistor, and aims to shunt voltage and prevent instantaneous high voltage from damaging the capacitor C6 and the resistor R7, so that the voltage of the capacitor C6 is more stable.
When the live wires L11, L21 and L31 have output voltages, the 3 pin and the 4 pin of the photoelectric switch EDK are closed and conducted to output a positive voltage, the 4 pin of the photoelectric switch EDK is connected with one end of a resistor R1, the other end of the resistor R1 is connected to the b pole of a PNP triode, the PNP triode is a current amplifier with negative current control, the PNP triode does not work, the 4 pin of the EDK outputs the positive voltage to be connected with the positive pole of a diode D1, the negative pole of the diode D1 charges a capacitor C2, and the positive voltage of the capacitor C2 is connected to an e emitter of the PNP triode; when the live wires L11, L21 and L31 are powered off and have no voltage output, the 3 pin and the 4 pin of the photoelectric switch EDK are disconnected and have no positive voltage output, the b pole of the PNP triode has no positive voltage but obtains a negative voltage sent by the resistor R2, the PNP triode works, the e pole and the C pole of the PNP triode are conducted, the storage voltage of the capacitor C2 is sent to the G trigger pole of the silicon controlled BT1, the silicon controlled BT1 works, the A anode and the K cathode of the silicon controlled BT1 are conducted, the tripping electromagnetic coil VH obtains high voltage of the capacitor C6 from energy storage, the tripping electromagnetic coil VH generates a strong electromagnetic field, and the strong magnetic field pulls the whole tripping linkage mechanism QP to make the linkage switch K1, the linkage switch K2 and the linkage switch K3 linkage trip and break.
When the linkage switch K1, the linkage switch K2 and the linkage switch K3 are linked and connected, the live wire L11, the live wire L21 and the live wire L31 have alternating-current voltage output, the resistor R4 has a voltage, the voltage value depends on the voltage stabilizing value of the resistor R4 and the voltage stabilizing diode W2, the capacitor C5 makes the voltage at the two ends of the voltage stabilizing diode W2 more pure and stable, the voltage is provided for the working voltage of the pin 1 and the pin 2 of the photoelectric switch EDK by the current-limiting resistor R4, the pin 1 and the pin 2 of the photoelectric switch EDK work after obtaining the voltage, the pin 3 and the pin 4 of the photoelectric switch EDK are conducted, so that the positive connection point of the capacitor C3, the resistor R1, the resistor R2 and the diode D1 obtains the positive voltage (for example, 5V) provided by the cathode W3 of the voltage regulator, the b pole of the PNP triode obtains the positive voltage (for example, 5V) through the resistor R1, the PNP triode is a negative voltage bias current amplifier, therefore, the PNP transistor does not work, and the capacitor C2 which is connected to the energy conduction of the diode D1 with the e pole of the PNP transistor obtains a positive voltage; when power is off, the live wire L11, the live wire L21 and the live wire L31 have no voltage, the resistor R4 has no current and no voltage, the zener diode W2 has no current and no voltage, the pin 1 and the pin 2 of the photoelectric switch EDK have no current, the pin 3 and the pin 4 of the photoelectric switch EDK are not conducted, the b pole of the PNP triode can not obtain positive voltage, but obtain the working negative bias voltage of the zero line of the ground wire E point circuit connected by the resistor R1 in series with the resistor R2, the PNP triode works, the E emitting electrode and the C collecting electrode of the PNP triode are conducted, the positive voltage of the capacitor C2 connected with the E emitting electrode of the PNP triode to the C collecting electrode provides a positive pulse trigger electric signal to the G trigger electrode of the silicon controlled BT1, the A anode of the silicon controlled BT1 is conducted with the K cathode, the tripping electromagnetic coil obtains high voltage of the capacitor C6 from the energy storage, the VH of the, the interlock switch K1, the interlock switch K2 and the interlock switch K3 are interlocked to trip and cut off the power. The voltages of the live line L11, the live line L21, and the live line L31 are the same.
The capacitor C1 and the capacitor C2 are interference capacitors, the working stability of the circuit is improved, b-pole voltage signal input of the PNP triode is negative control conduction, a live wire L11, a live wire L21 and a live wire L31 are generally 220-volt or 380-volt power supply outputs, and can be other voltages, and the circuit is provided with electronic elements with different powers and performances according to different voltages so as to adapt to different voltages; the b-pole voltage signal input of the PNP triode is positive voltage, the PNP triode does not work, 220V or 380V power supply does not exist when live wires L11, L21 and L31 are powered off, the b-pole voltage signal input of the PNP triode is converted into negative voltage, and the PNP triode works.
The leakage test is composed of a resistor R5, a leakage test coil TA and a leakage test switch K4, and is used for verifying whether the leakage test switch K4 is tripped or not. The leakage induction voltage output is composed of a voltage induction magnetic ring TE and a voltage induction coil TC, and when any live wire (live wire L11, live wire L21 and live wire L31) or zero line leaks to the ground, the voltage induction coil TC has induction voltage output.
The anti-crosstalk circuit comprises a diode D2 and a diode D3, wherein the diode D2 is used for outputting power failure tripping electric signals, the diode D3 is used for outputting leakage tripping electric signals, and the anti-crosstalk circuit enables circuits which work differently between power failure tripping and leakage tripping not to respond to respective working states.
The live wire L1, the live wire L2 and the live wire L3 are input ends of an alternating current power supply, when the linkage switch K1, the linkage switch K2 and the linkage switch K3 are connected, the live wire L1, the live wire L2 and the live wire L3 have alternating current voltage output, when the live wire L1, the live wire L2, the live wire L3 or a zero line alternating current voltage output leaks to the ground, the voltage induction magnetic ring TE generates an electromagnetic field, the voltage induction coil TC induces and generates voltage, because the 2-pin voltage of the voltage induction coil TC is connected with a zero line E point of a circuit, the voltage of 1 pin of the voltage induction coil TC is sent to a b pole of the NPN triode through a current limiting resistor R11 to carry out current amplification, an emitter E of the NPN triode outputs positive voltage, the positive voltage is sent to a trigger G of the silicon controlled BT1 through a negative pole of a diode D3, an anode A of the silicon controlled BT1 is conducted with a cathode K, so that a tripping electromagnetic coil VH obtains high voltage, the strong magnetic field pulls the trip interlocking mechanism QP to trip and interrupt the interlocking switch K1, the interlocking switch K2, and the interlocking switch K3. The capacitor C4 and the resistor R3 are bias capacitors and resistors of the b pole of the NPN triode, the working stability of the NPN triode is improved, the voltage stabilizing diode W1 prevents the voltage induced by the voltage induction coil TC from being too high to damage the NPN triode, the working voltage of the collector C of the NPN triode is from the positive pole of the energy storage capacitor C6 (high-voltage capacitor C6) to be connected with the current limiting resistor R7, and the working voltage is sent to the negative pole of the photoelectric switch EDK from 3 feet to 4 feet. The resistor R6 is a step-down shunt resistor, and the zener diode W3 stabilizes the voltage across the resistor R6 (e.g., 5v) to provide the operating voltage of the circuit. The resistor R4, the voltage stabilizing diode W2 and the high-voltage capacitor C6 are connected in series with the power output ends of three live wires (live wire L11, live wire L21 and live wire L31) to form a high-voltage half-wave rectifying circuit, and the capacitor C6 is a direct-current high-voltage energy storage capacitor and provides electric energy for leakage tripping and power failure tripping.
The current-limiting resistor R5, the leakage checking coil TA and the leakage checking switch K4 are connected in series and respectively connected with the power output ends of a live wire L11 and a live wire L21, the simulation leakage state is checked according to a normally open switch of a through leakage checking switch K4, current passes through the leakage checking coil TA according to a through leakage checking switch K4, the voltage induction magnetic ring TE generates an electromagnetic field, the voltage induction coil TC induces and generates voltage, the voltage of a pin 2 of the voltage induction coil TC is connected with a zero line E point of a circuit, the voltage of a pin 1 of the voltage induction coil TC is transmitted to a pole b of an NPN triode through the current-limiting resistor R11 to amplify the current, an emitter E of the NPN triode outputs a positive voltage, the positive voltage is transmitted to a trigger pole G of a silicon controlled BT1 through a negative pole of a diode D3, an anode A of the silicon controlled 1 is communicated with a cathode K, so that a solenoid coil VH 6 high voltage of, the strong magnetic field pulls the trip interlocking mechanism QP to trip and interrupt the interlocking switch K1, the interlocking switch K2, and the interlocking switch K3. The trip interlocking mechanism QP can be implemented by using the prior art, and is not limited to the technical scheme of the present application.
The foregoing description is of a three-phase, three-wire circuit, with the three wires all being live; a zero line can be added to be changed into a three-phase four-wire circuit, the zero line also penetrates through a voltage induction magnetic ring TE, a tripping linkage mechanism QP which is connected with a switch, an overload electromagnetic coil, a linkage switch K1, a linkage switch K2, a linkage switch K3, an overload electromagnetic coil AH, an overload electromagnetic coil BH and an overload electromagnetic coil CH in parallel is added on the zero line, and the live wire and the zero line synchronously trip when power failure and electricity leakage happen.
A three-phase power failure and leakage tripping switch can also be called a three-phase power failure and leakage tripping switch circuit or a three-phase power failure and leakage tripping switch system and the like.
The above embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. The utility model provides a three-phase power failure, electric leakage trip switch, includes three-phase power input circuit, three-phase interlock trip switch, electric leakage trip detection electric leakage induction voltage output circuit, three-phase power output circuit, and three-phase power input circuit connects three-phase interlock trip switch, and three-phase interlock trip switch connects electric leakage trip detection electric leakage induction voltage output circuit, and electric leakage trip detection electric leakage induction voltage output circuit connects three-phase power output circuit, its characterized in that: the three-phase power supply output circuit is connected with a three-phase rectification output circuit, the three-phase rectification output circuit is connected with a high-low voltage direct current voltage backflow prevention circuit after power failure, the high-low voltage direct current voltage backflow prevention circuit after power failure is connected with a high-low voltage direct current power supply output circuit, the high-low voltage direct current power supply output circuit is connected with a power failure tripping positive voltage output switch circuit, a leakage tripping positive current amplification trigger circuit, a power failure tripping negative current amplification trigger circuit and a silicon controlled direct current high voltage switch circuit, and the silicon controlled direct current high voltage switch circuit is connected with a three-phase linkage tripping switch; the three-phase rectification output circuit is connected with the power failure tripping positive voltage output switch circuit, the power failure tripping positive voltage output switch circuit is connected with the electric leakage tripping positive current amplification trigger circuit and the power failure tripping negative current amplification trigger circuit, the electric leakage tripping positive current amplification trigger circuit and the power failure tripping negative current amplification trigger circuit are connected with an anti-crosstalk circuit, and the anti-crosstalk circuit is connected with the silicon controlled direct current high-voltage switch circuit; and the electric leakage tripping detection electric leakage induction voltage output circuit is connected with the electric leakage tripping positive current amplification trigger circuit.
2. The three-phase power failure, leakage trip switch of claim 1, wherein: the three-phase power supply output circuit comprises three alternating current output live wires L11, L21 and L31;
the three-phase rectification output circuit comprises a diode D5, a diode D6 and a diode D7, wherein the anode of the diode D5 is connected with a live wire L31, the anode of the diode D6 is connected with a live wire L21, and the anode of the diode D7 is connected with a live wire L11; and the negative electrode of the diode D5, the negative electrode of the diode D6 and the negative electrode of the diode D7 are connected with a circuit for preventing high-low voltage direct current voltage from reversing after power failure and a circuit for preventing positive voltage output switch from tripping in power failure.
3. The three-phase power failure, leakage trip switch of claim 2, wherein: the circuit for preventing the high-low voltage direct current voltage from falling after power failure comprises a diode D4 and a current-limiting resistor R10, wherein the anode of a diode D4 is connected with the cathode of a diode D5, the cathode of a diode D6 and the cathode of a diode D7, the cathode of a diode D4 is connected with one end of a resistor R10, and the other end of the resistor R10 is connected with a high-low voltage direct current power supply output circuit and a three-phase linkage tripping switch.
4. A three-phase power failure, leakage trip switch according to claim 3, wherein: the high-low voltage direct current power supply output circuit comprises a capacitor C6, a resistor R6, a resistor R7, a resistor R8 and a voltage stabilizing diode W3, wherein the other end of the resistor R10 is connected with the anode of the capacitor C6, the resistor R7 and the resistor R8, the resistor R7 and the resistor R6 are connected to two ends of the capacitor C6 after being connected in series, two ends of the resistor R6 are connected with a voltage stabilizing diode W3 in parallel, the cathode of the voltage stabilizing diode W3 is connected with one end of the resistor R7 and one end of the resistor R6, the anode of the voltage stabilizing diode W3, the cathode of the capacitor C6 and the other end of the resistor R6 are connected with a circuit zero line E; one end of the resistor R8 is connected with the positive electrode of the capacitor C6, and the other end is connected with the negative electrode of the capacitor C6 and the circuit zero line E.
5. The three-phase power failure, current leakage trip switch of claim 4, wherein: the power failure tripping positive voltage output switch circuit comprises a current-limiting resistor R4, a capacitor C5, a voltage stabilizing diode W2 and a photoelectric switch EDK; one end of the resistor R4 is connected with the cathode of the diode D5, the diode D6 and the diode D7, the other end of the resistor R4 is connected with one end of the capacitor C5, the cathode of the voltage stabilizing diode W2 and the pin 1 of the photoelectric switch EDK, and the other end of the capacitor C5, the anode of the voltage stabilizing diode W2 and the pin 2 of the photoelectric switch EDK are connected with the zero line E of the circuit; and the 3 pins of the photoelectric switch EDK are connected with the cathode of the voltage stabilizing diode W3, one end of the resistor R6 and one end of the resistor R7.
6. The three-phase power failure, current leakage trip switch of claim 5, wherein:
the positive current amplification trigger circuit for the leakage tripping comprises an NPN triode, a resistor R3, a resistor R11, a voltage stabilizing diode W1 and a capacitor C4, and forms a positive control current amplification circuit, the NPN triode is used as a current amplifier and comprises a b pole, an E pole and a C pole, the b pole of the NPN triode is connected with one end of the capacitor C4, the negative pole of the voltage stabilizing diode W1, one end of the resistor R3 and one end of the resistor R11, and the positive pole of the voltage stabilizing diode W1, the other end of the capacitor C4 and the other end of the resistor R3 are connected with a zero line E point of the circuit; one end of the resistor R11 is connected with the b pole of the NPN triode, and the other end of the resistor R11 is connected with the leakage tripping detection leakage inductance voltage output circuit;
the e pole of the NPN triode is connected with the anti-crosstalk circuit;
the c pole of the NPN triode is connected with the 4 pins of the photoelectric switch EDK;
the power failure tripping negative current amplification trigger circuit comprises a PNP triode, a resistor R1, a resistor R2, a diode D1, a capacitor C2 and a capacitor C3, and the PNP triode, the resistor R1, the resistor R2, the diode D1, the capacitor C2 and the capacitor C3 form a negative control current amplification circuit; the PNP triode comprises a b pole, an e pole and a c pole; the 4-pin of the photoelectric switch EDK is connected with one end of a resistor R1, a resistor R2, a capacitor C3 and the anode of a diode D1, and the other end of the resistor R1 is connected with the b pole of the PNP triode;
the negative electrode of the diode D1 is connected with one end of the capacitor C2 and the e pole of the PNP triode;
the other ends of the capacitor C2, the resistor R2 and the capacitor C3 are connected with a circuit zero line E;
and the c electrode of the PNP triode is connected with the anti-crosstalk circuit.
7. The three-phase power failure, current leakage trip switch of claim 6, wherein: the anti-crosstalk circuit comprises a diode D2 and a diode D3, wherein the anode of the diode D2 is connected with the c pole of the PNP triode, and the anode of the diode D3 is connected with the e pole of the NPN triode; the cathodes of the diode D2 and the diode D3 are connected with a thyristor direct-current high-voltage switch circuit.
8. The three-phase power failure, current leakage trip switch of claim 7, wherein: the silicon controlled direct-current high-voltage switching circuit consists of a silicon controlled BT1 and a capacitor C1, and the silicon controlled BT1 comprises a G pole, a K pole and an A pole; the G pole of the controlled silicon BT1 is connected with the negative pole of a diode D2, the negative pole of a diode D3 and one end of a capacitor C1, and the other end of the capacitor C1 is connected with a circuit zero line E; the K pole of the controlled silicon BT1 is connected with a zero line E of the circuit, and the negative pole of the capacitor C6 is connected with the K pole of the controlled silicon BT 1; the A pole connection of the controllable silicon BT1 is connected with a three-phase linkage tripping switch.
9. The three-phase power failure, current leakage trip switch of claim 8, wherein: the leakage current tripping inspection leakage current induction voltage output circuit comprises a voltage induction magnetic ring TE, a leakage current inspection coil TA, a voltage induction coil TC, a leakage current inspection switch K4 and a resistor R5;
the live wires L11, L21 and L31 penetrate through the voltage induction magnetic ring TE; the electric leakage detection coil TA is wound on the voltage induction magnetic ring TE; the voltage induction coil TC is wound on the voltage induction magnetic ring TE; the voltage induction coil TC is relatively positioned at the other end, far away from the electric leakage detection coil TA;
one end of the leakage detection switch K4 is connected with a live wire L21, the other end of the leakage detection switch K4 is connected with one end of a leakage detection coil TA, the other end of the leakage detection coil TA is connected with one end of a resistor R5, and the other end of the resistor R5 is connected with a live wire L11;
one end of the voltage induction coil TC is connected with a resistor R11, the other end of the voltage induction coil TC is connected with a circuit zero line E and the anodes of a diode D8, a diode D9 and a diode D10, the cathode of the diode D8 is connected with a live wire L11, the cathode of the diode D9 is connected with a live wire L21, and the cathode of the diode D10 is connected with a live wire L31; the diode D5, the diode D6, the diode D7, the diode D8, the diode D9 and the diode D10 form a three-phase full-wave rectification circuit.
10. The three-phase power failure, current leakage trip switch of claim 8, wherein: the three-phase linkage tripping switch is a tripping linkage device QP; the tripping interlocking device QP comprises an interlocking switch K1, an interlocking switch K2, an interlocking switch K3, a tripping electromagnetic coil VH, an overload electromagnetic coil AH, an overload electromagnetic coil BH and an overload electromagnetic coil CH; the three-phase power supply input circuit comprises three alternating current input live wires L1, L2 and L3, and the three alternating current input live wires L11, L21 and L31 correspond to the three alternating current output live wires one by one; one end of the linkage switch K1 is correspondingly connected with a live wire L1, the other end of the linkage switch K1 is connected with an overload electromagnetic coil AH, and the other end of the overload electromagnetic coil AH is connected with a live wire L11; one end of the linkage switch K2 is correspondingly connected with a live wire L2, the other end of the linkage switch K2 is connected with an overload electromagnetic coil BH, and the other end of the overload electromagnetic coil BH is connected with a live wire L21; one end of the linkage switch K3 is correspondingly connected with a live wire L3, the other end of the linkage switch K3 is connected with an overload electromagnetic coil CH, and the other end of the overload electromagnetic coil CH is connected with a live wire L31; one end of the tripping electromagnetic coil VH is connected with a resistor R10, a capacitor C6, a resistor R7 and a resistor R8, and the other end of the tripping electromagnetic coil VH is connected with an A pole of a thyristor BT 1; the tripping electromagnetic coil VH is connected with the overload electromagnetic coil AH, the overload electromagnetic coil BH, the overload electromagnetic coil CH, the linkage switch K1, the linkage switch K2 and the linkage switch K3 in an integral magnetic induction mode.
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