CN2852373Y - Creepage breaker - Google Patents

Abstract

The utility model relates to an electric leakage circuit breaker which can play a role of leakage protection not only when a power supply line is normal, but also when the power of a fire wire or a zero line in the power supply line is switched off. Two gate circuits are added on existing electric leakage circuit breakers, wherein two diodes connected in series with one of the gate circuits are orderly and electrically connected with a single direction controlled silicon element and an electromagnet coil of a mechanical tripping switch according to a consistent conducting direction, the cathode of the other diode is electrically connected with a conductor wire between the two series diodes, and the anode of the other diode is electrically connected with a wiring terminal of an earth line; the cathode of each of three diodes in the other gate circuit is electrically connected to a three phase fire wire of an output line according to the conducting direction of a circuit. When the running of an input circuit is normal and the wire breaking of the fire wire or the zero line of the input circuit appears, if electric leakage or personal electric shock occurs, the electric leakage circuit breaker enables the tripping switch to automatically separate, which plays a protective function.

Description

Residual current circuit breaker

Affiliated technical field

The utility model relates to a kind of protective device of leaking electricity of preventing, especially can both play a protective role when the outage of input power supply generation zero line, live wire outage.

Background technology

At present, the structure of known residual current circuit breaker is made up of shell, mechanical release, switch, test knob, transducer and controller.Its operation principle is to pick up electric leakage signal by instrument transformer to reach rectification circuit, makes the conducting of switch thyristor to electromagnet apparatus, and the driving machinery release separates its switch, plays the earth leakage protective effect.But foot; certain phase firewire broken string or neutral line break can take place on incoming line; or in insure silk fusing of incoming line phase shortage, accident broken string appear; because the operating voltage of general residual current circuit breaker is taken at zero line and a certain phase firewire; as the arbitrary line outage in this two wires, earth leakage protective device all is in make position because of no operating voltage makes its switch, but two phase firewires still are in conducting state in addition; if electric leakage this moment, then protector can not play the earth leakage protective effect.

Summary of the invention

Is inoperable deficiency in order to overcome existing residual current circuit breaker at supply line's appearance broken string; the invention provides a kind of residual current circuit breaker; this residual current circuit breaker can not only just often shield in supply line, and still can play the earth leakage protective effect when the outage of live wire or zero line occurring in supply line.

The technical scheme that its technical problem that solves the utility model adopts is: four of input wires terminals are housed, four of output wiring terminals, one of earth terminal, one of test knob, one of switch knob, one of indication knob in the insulation crust outside.In insulation crust, the contact of four binding posts, four mechanical dropout switches four leads that are linked in sequence pass instrument transformer together, be electrically connected OR circuit, mechanical release electromagnet coil, one-way SCR element, the diode of forming by zero line, three diodes and be serially connected in gate circuit that three diodes on the output three-phase firewire form and be electrically connected and form the internal circuit operating voltage respectively with four lead-out terminals.Test knob, test resistance are in parallel with it, mutual inductor coil is connected electrically in the input of rectification circuit, the output head anode of rectification circuit is electrically connected with the control utmost point of one-way SCR element, negative pole is connected with the cathodic electricity of one-way SCR element, between the negative electrode of one-way SCR element and the control utmost point, be electrically connected an electrolytic capacitor, two diode series connection in the OR circuit, its tie point is electrically connected with another diode cathode, and the anode of this diode is electrically connected with earth terminal.When power consumption equipment leaks electricity; when person electric shock and electric current surpass set quota; mutual inductor coil is inducted and is become direct voltage after the alternating current pressuring meridian rectification circuit rectification; this voltage is more than or equal to the trigger voltage of one-way SCR element; be added between the control utmost point of one-way SCR element and the negative electrode and make its conducting; electric current is by the series diode of zero line in OR circuit; mechanical release electromagnet coil leaks electricity; the one-way SCR element; diode; gate circuit constitutes the loop to three-phase firewire; at this moment the mechanical release electromagnet adhesive of leaking electricity; switch contact is disconnected; protective effect has been played in the circuit outage.When the outage of input power supply generation zero line; the live wire that has only by residual current circuit breaker; at this moment if the electric leakage of generation equipment; when person electric shock and electric current surpass set quota; become direct voltage after the alternating current pressuring meridian rectification circuit rectification that mutual inductor coil is inducted; this voltage is more than or equal to the trigger voltage of one-way SCR element; be added between the control utmost point of one-way SCR element and the negative electrode and make its conducting; electric current is by the series diode of earth connection in OR circuit; mechanical release electromagnet coil leaks electricity; the one-way SCR element; diode; gate circuit constitutes the loop to three-phase firewire; at this moment the mechanical release electromagnet adhesive of leaking electricity; switch contact is disconnected; the circuit outage plays a protective role.As long as the input power supply has a phase firewire conducting; residual current circuit breaker just can be worked; if this moment is the electric leakage of generation equipment; when person electric shock and electric current surpass set quota; become direct voltage after the alternating current pressuring meridian rectification circuit rectification that mutual inductor coil is inducted; this voltage is more than or equal to the trigger voltage of one-way SCR element; be added between the control utmost point of one-way SCR element and the negative electrode and make its conducting; electric current is by the series diode of earth connection in OR circuit; mechanical release electromagnet coil leaks electricity; the one-way SCR element; diode; gate circuit constitutes the loop to this live wire; at this moment the mechanical release electromagnet adhesive of leaking electricity; switch contact is disconnected; protective effect has been played in the circuit outage.

The beneficial effects of the utility model are to implement protection in the time of can normally moving or take place zero line outage, live wire outage on the input power cord road in all directions.The circuit China National Instruments Import ﹠ Export Corporation add two gate circuits be electrically connected, simple in structure.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is the external structure figure of the utility model embodiment.

Fig. 3 is the planar configuration figure of the utility model embodiment.

1. mechanical dropout switches among the figure, 2. input live wire, 3. input zero line, 4. four of switch pairs of contacts, 5. test knob, 6. OR circuit, 7. mechanical release electromagnet coil, 8. one-way SCR element, 9. electrolytic capacitor, 10. bridge circuit, 11. diodes, 12. earth terminal, 13. test resistances, 14. gate circuits, 15. the output zero line, 16. output live wires, 17. instrument transformers, 18. the electric leakage indication recovers knob, 19. wiring boards and element, 20. insulation crusts.

Embodiment

In Fig. 1, test knob (5), test resistance (13) series connection are connected with zero line, diode (11), the gate circuit (14) of machinery dropout switch respectively; OR circuit (6), mechanical dropout switch electromagnet coil (7), one-way SCR element (8), diode (11), gate circuit (14) series connection are connected with output live wire (16) respectively; Instrument transformer (17) lead-in wire is connected on the input circuit of bridge circuit (10) respectively; The output cathode of bridge circuit (10) is connected with the control utmost point of one-way SCR element (8), and negative pole is connected with the negative electrode of one-way SCR element (8), is connected an electrolytic capacitor (9) between the control utmost point and negative electrode; Connect a diode from asking of OR circuit (6) series diode, the anode of this diode is connected with ground wire.All parts all are contained in the shell (20) of insulation.

Claims (1)

1. anticreep circuit breaker, in insulation crust, machinery dropout switch electromagnet coil, OR circuit, the one-way SCR element, diode, gate circuit is pressed the consistent order of conducting direction and is electrically connected, it is characterized in that: two diodes in the OR circuit that is made of three diodes are by in the consistent circuit that is connected on mechanical dropout switch electromagnet coil and one-way SCR element with one-way SCR element conductive direction, the negative electrode of another diode is electrically connected with lead between two series diodes, anode is electrically connected with ground wire, another gate circuit of connecting in the line and being made of three diodes, the negative electrode of diode is connected electrically in respectively on the output three-phase firewire by the line conduction direction.

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