CN87207689U

CN87207689U - Leakage protector

Info

Publication number: CN87207689U
Application number: CN 87207689
Authority: CN
Inventors: 张明
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-05-05
Filing date: 1987-05-05
Publication date: 1988-10-12

Abstract

The utility model discloses a leakage protector comprising a reliability detecting circuit. The leakage protector can safely detect the reliability thereof in the installing and using process at any time, and the leakage protector has obvious advantages for the user without a detecting mode. For adopting a double detecting circuit, the leakage protector can work or alarm when a detecting circuit is out of work.

Description

leakage protector

The utility model relates to a kind of earth leakage protective device, the earth leakage protective device that particularly single-phase electrical equipment is used.

Existing earth leakage protective device adopts zero sequence current mutual inductor to detect electric leakage signal usually, and its shortcoming is could move when the people gets an electric shock, so its tripping mechanism is quite reliable.For the personnel of cardiac and ascend operation, even protector is in time cut off the electricity supply, the suffered unexpected scaring that gets an electric shock also easily causes contingency.Also have employing that the earth leakage protective device of leakaging signal detecting circuit is installed between zero line and ground wire, though the electrical appliance shell once charged can the warning, under the situation of zero line break, such protector is inoperative.And if above-mentioned earth leakage protective device in use lost efficacy, also be not easy timely discovery.

Task of the present utility model is to improve above-mentioned earth leakage protective device, eliminates unsafe factor, and then a kind of earth leakage protective device of good reliability is provided.

Utility model is achieved in that increases the reliability testing circuit on existing earth leakage protective device, utility model is made up of detection of electrical leakage, protective circuit and reliability testing circuit, to improve the fail safe of earth leakage protective device.The self-checking circuit that reliability circuitry can be made up of current-limiting resistance and switch, self-checking circuit also can be gone here and there light-emitting component.In the protector that uses zero sequence current mutual inductor, self-checking circuit can be connected on any contact on two primary windings of instrument transformer.For the earth leakage protective device that electric-leakage detection circuit is installed between zero line and the ground wire, self-checking circuit can be installed between phase line and the ground wire.

For the earth leakage protective device that electric-leakage detection circuit is installed between zero line and ground wire, whether zero line opens circuit also influences the security reliability of protector, therefore monitors that the zero line break indicating device whether zero line opens circuit also can be used as the reliability testing circuit.

Foregoing circuit has had significant improvement than existing earth leakage protective device security reliability, but does not thoroughly remove a hidden danger, preferably with zero-sequence transformer as electric-leakage detection circuit, and the electric-leakage detection circuit that will install between zero line and ground wire is as the reliability testing circuit.So no matter whether zero line opens circuit, and have nobody to get an electric shock, or under the situation of one of two testing circuits complete failure, earth leakage protective device all can move or report to the police.If two testing circuits all add self-checking circuit, the reliability of circuit is stronger.

Utility model can be installed in power end, as makes block terminal or socket type.Also can be installed in electrical appliance one end, as be installed on the electrical appliance or make plug, even can earth leakage protective circuit and reliability testing circuit be installed respectively at power end and electrical appliance one end.

Utility model is applicable to single phase circuit, also can be used on the three-phase line.

The advantage of utility model is no matter to install when also being to use earth leakage protective device, can both be safely, the reliability of check protection device at any time easily, and special in the user who does not have detection means, its advantage is more obvious.And, the fail safe of earth leakage protective device is improved owing to adopt the double check circuit.

Below with reference to accompanying drawing utility model is described in further detail.

Fig. 1, Fig. 2, Fig. 3 are utility model increases different reliability testing circuits on the earth leakage protective device of different types electrical schematic diagram.

With reference to Fig. 1, detection of electrical leakage partly is a zero sequence current mutual inductor, its primary winding L1 and L2 are on magnetic core, under the normal condition, total magnetic flux is zero in the primary winding, as when electric leakage, leakage current from the ground connection binding post of load shell by socket CZ1 through diode D2, current-limiting resistance R2 and LED 2 to zero line N.LED 2 luminous warnings.Meanwhile, loaded work piece electric current coils L2 is to zero line N.And the electric current of the L1 that flows through is above-mentioned two electric current sums.Therefore primary winding magnetic flux can not be offset fully, makes the secondary coil of instrument transformer induce an alternating voltage, makes the normally-closed contact j of relay disconnect cut off the electricity supply (omitting in the circuit diagram after the secondary coil) through related circuit.So, get an electric shock or zero line break even utility model is unmanned, also can in time cut off the electricity supply.By LED 1; current-limiting resistance R1; push-button switch AN and rectifying tube D1 form the self-checking circuit of zero-sequence transformer; press the button AN, earth leakage protective device should be able to be cut off the electricity supply, if relay can not be cut off the electricity supply; LED 1 does not work; fault goes out at self-checking circuit so, and LED 1 is bright, and fault goes out at zero-sequence transformer and trip circuit.Self-checking circuit when installing and use earth leakage protective device, the reliability of check circuit at any time.LED 1 and LED2 also can adopt the luminous warning of other light-emitting component such as neon tube.

With reference to Fig. 2, reliability circuitry is by being contained in the zero line break indicating device that neon tube N1 on the electrical appliance and resistance R 3 are formed.This circuit also working indicating of double as load R1 in parallel with load R2.Electric-leakage detection circuit is made up of neon tube N2 and resistance R 4, and when load shell (1) leaked electricity, electric current arrived zero line N, the luminous warning of neon tube N2 through electric-leakage detection circuit.Electric-leakage detection circuit can be contained on the electrical appliance, also can be contained in plug or the socket.

With reference to Fig. 3, the reliability testing circuit also is a kind of zero line break indicating device, is to be contained in the Electric tester of being made up of neon bulb N3 and resistance R 5 in the socket CZ2.Ground connection can screw within the walls or be connected on the running water pipe with screw, also can pass through human body touch ground connection.The luminous warning of neon tube N3.Show zero line break or distribution mistake.The same Fig. 2 of electric-leakage detection circuit.

Electric-leakage detection circuit among Fig. 2 and Fig. 3 can increase sound reports to the police and switching circuit, to increase the security reliability of earth leakage protective device.Also available other light-emitting components of neon tube such as light-emitting diode.The zero line break indicating device also can increase sound and report to the police and switching circuit.

Claims

1, a kind of earth leakage protective device is characterized in that earth leakage protective device has increased the reliability testing circuit.

2, earth leakage protective device as claimed in claim 1 is characterized in that the self-checking circuit that the reliability testing circuit is made up of switch, light-emitting component and current-limiting resistance.

3, earth leakage protective device as claimed in claim 1 is characterized in that the reliability testing circuit is the zero line break indicating device.

4, earth leakage protective device as claimed in claim 3 is characterized in that the zero line break indicating device is made up of light-emitting component N1 in parallel with load and resistance R 3.

5, earth leakage protective device as claimed in claim 3 is characterized in that the zero line break indicating device is an Electric tester.

6, earth leakage protective device as claimed in claim 1 is characterized in that the reliability testing circuit is mounted in the electric-leakage detection circuit between zero line and the ground wire.

7,, it is characterized in that the zero line break indicating device also has audible alarm and switching circuit as claim 3,4 or 5 described earth leakage protective devices.