CN201142467Y

CN201142467Y - Creepage protecting plug

Info

Publication number: CN201142467Y
Application number: CNU2007201866007U
Authority: CN
Inventors: 邵宝平
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-12-30
Filing date: 2007-12-30
Publication date: 2008-10-29
Anticipated expiration: 2017-12-30

Abstract

The utility model discloses an electricity leakage protection plug, comprising a plug, a casing, a copper sheet plug pin with a live pole, a null pole and an earth pole, and a zero-phase sequence current transformer, a breadboard circuit, a sampling amplification circuit, a direct current supply circuit, a breaking device and an electric relay arranged among a live wire, a null line and an earth wire, wherein the output terminal of the zero-phase sequence current transformer is connected with the input end of the amplification circuit. The electricity leakage protection plug is characterized in that a grounding device, which is capable of firstly connecting with the earth pole and then connecting with the live pole and the null pole, or breaking the earth pole, the live pole and the null pole at the same time, is arranged on the breaking device, the grounding device is composed of a pair of earth wire contacts, a spring and a breaking device, the spring is connected between the earth wire moving contact spring leaf and the breaking device, and the live wire, the null line and the earth wire pass through the zero-phase sequence current-transformer at the same time. The electricity leakage protection plug provided by the utility model can not only prevent electric shock accidents caused by electric appliances, but only prevent electric-shock accidents caused by the power supply other than the electric appliances, ensure the identical electricity leakage value on the live pole, the null pole and the earth pole, and improve the sensitivity and safety. The electricity leakage protection plug can be used for electricity leakage protection of various household electrical appliances.

Description

A kind of leakage protecting plug

Technical field

The utility model relates to a kind of earth leakage protective device, belongs to Electrical Safety resist technology field.

Background technology

Through looking into Chinese patent; the patent No. is a kind of all-purpose leakage protection plug of 01257288.8; its ground wire is provided with a leakage indicator; be provided with a zero sequence current mutual inductor between phase, the zero line; when the local tape of this leakage protecting plug is electric; its electrical leakage is higher than the electrical leakage of phase, zero utmost point, has increased the charged current value of human body.In addition the all-purpose leakage protection plug described in the patent is realized be phase, zero, three extremely in arbitrary utmost point occur when unusual; it all is disconnected ground wire behind the first phase failure, the zero line; if but disconnected ground wire after first phase failure during actual local tape electricity, zero line; prolonged the time of getting an electric shock on the contrary, the easier generation that causes human casualty accident.

The utility model content

In view of the problem that background technology exists, the utility model leakage protecting plug, with phase, zero, the three-way zero sequence current mutual inductor that passes simultaneously, realized the consistency of electrical leakage, simultaneously because only with a current transformer, make structure compact more, succinctly; And on earthing device, improve, realized can both in less than the time of 0.1S, disconnecting simultaneously when electric leakage takes place for the arbitrary utmost point with all of circuit and be connected.

For solving the problems of the technologies described above, the utility model is realized by the following technical solutions: a kind of leakage protecting plug, comprise plug, shell and phase, zero, ground three utmost point copper sheet latches, be contained in phase, zero, zero sequence current mutual inductor between the ground wire, hookup, sampling amplification circuit, DC power-supply circuit, breaker and relay, the output of zero sequence current mutual inductor is connected with the input of sampling amplification circuit, it is characterized in that on described breaker, being provided with the extremely logical phase in back of an energy elder generation earthing, zero utmost point or divide the phase failure simultaneously, zero, the earthing device in earth polar, described earthing device is by a pair of ground wire contact, spring and breaker are formed, described spring is connected between ground wire moving contact reed and the breaker mutually, described phase, zero, ground wire passes zero sequence current mutual inductor simultaneously; The iron core of described zero sequence current mutual inductor is made up of beryllium Mo alloy or amorphous alloy or ultramicro-crystal alloy material; Described plug inside is provided with two independent storehouses, phase, zero, three utmost point latches be loaded in the same storehouse, the circuit elements parts of its earth leakage protective device are loaded on another storehouse.

Whether the utility model has or not the residual current except detecting between load phase, the zero line, also detect ground wire and leak electricity; When three extremely in arbitrary utmost point occur when unusual, can both all disconnect phase, zero, ground wire immediately, reach the purpose that disconnects fully with power supply, thereby protect personal safety effectively.The setting in two independent storehouse separates the movement of latch and parts, has reduced the heating that causes because of the plug loose contact influence to circuit.Compared with prior art, its characteristics are: the leakage protecting plug power line that 1, is connected to the electrical appliance outside, no matter it is residual current to occur between the phase that causes of apparatus failure, the zero line and reach a certain value or owing to other reason order originally should not charged ground wire be broken down electric current when making the charged electric leakage of electric appliance casing, can both all cut off power supply immediately, its effect equals plug is pulled out from socket; 2, phase, zero, ground wire pass zero sequence current mutual inductor simultaneously, its phase, zero, the sensible sampling amplification circuit of the shared testing circuit of earth polar residual current are realized reliable disjunction, guaranteed phase, zero, the consistency of electrical leakage, improved sensitivity and fail safe; 3, to have adopted when energized be first earthing line to the utility model leakage protecting plug, the logical phase in back, zero line, phase, zero during disjunction, the principle that disconnects simultaneously.

Description of drawings

Further describe relevant details of the present utility model below more in conjunction with the accompanying drawings.

Fig. 1 is a structural representation of the present utility model.

Embodiment

With reference to accompanying drawing, this leakage protecting plug, by zero sequence current mutual inductor 7, sampling amplification circuit 16, hookup 3, release 9, breaker 14, DC power supply 8, power line 4,5,6, shell and phase, zero, three utmost point copper sheet latches 11,10,1 form.The output of zero sequence current mutual inductor 7 is connected with the input of sampling amplification circuit 16, and described breaker 14 is provided with energy elder generation earthing extremely logical phase in back, zero utmost point or divide the earthing device in the phase failure, zero, earth polar simultaneously; Described earthing device is made up of a pair of ground wire contact 2, spring 15 and breaker 14.Described spring 15 is connected between ground wire moving contact 2 reeds and the breaker 14 mutually, and described phase, zero, ground wire 12,13,2 pass zero sequence current mutual inductor 7 simultaneously; The iron core of described zero sequence current mutual inductor 7 is made up of beryllium Mo alloy or amorphous alloy or ultramicro-crystal alloy material; Described plug inside is provided with two independent storehouses, phase, zero, three utmost point latches be loaded in the same storehouse, the circuit elements parts of its earth leakage protective device are loaded on another storehouse.Described both ends of the spring is connected with the pedestal bottom of breaker and the copper sheet of ground wire moving contact respectively, make ground wire 2 dynamic and static contacts have a spring force of inhaling mutually all the time, so when the moving-member of release 9 drive breakers 14 makes progress or moves downwards, closed behind the dynamic and static contact of phase line contact 12, zero line contact 13, guarantee to lead to phase, zero line behind the line of first earthing, thereby satisfied the requirement of safety utilization of electric power; Be used to detect that ground wire is whether charged is realized by zero sequence current mutual inductor 7 equally; Its phase, zero, ground wire pass zero sequence current mutual inductor simultaneously, thereby have satisfied the consistency of phase, zero, ground wire electrical leakage, have improved earth leakage protective sensitivity more.Zero sequence current mutual inductor is made up of iron core and the secondary winding on iron core in the present embodiment.When phase, zero, when leakage current appears in the wherein arbitrary line of ground wire, the secondary winding of zero sequence current mutual inductor is just exported a signal, amplifies, compares and handle through sampling amplification circuit 3; When if leakage current reaches a certain setting, the value that the signal of zero sequence current mutual inductor 7 outputs just sets greater than sampling amplification circuit 3, sampling amplification circuit 3 one of output are enough to make controllable silicon to lead the logical level of SCR, the controllable silicon conducting, release 9 is threaded off, and phase, zero, ground wire are cut off in breaker 14 actions, have realized the extremely whole disconnection of power supply three, finish opening time in less than 0.1 second, thereby guaranteed user's life security.

Claims

1; a kind of leakage protecting plug; comprise plug; shell and phase; zero; ground three utmost point copper sheet latches; be contained in phase; zero; zero sequence current mutual inductor between the ground wire; hookup; sampling amplification circuit; DC power-supply circuit; breaker and relay; the output of zero sequence current mutual inductor is connected with the input of sampling amplification circuit; it is characterized in that on described breaker, being provided with the extremely logical phase in back of an energy elder generation earthing; zero utmost point and divide the phase failure simultaneously; zero; the earthing device in earth polar; described earthing device is by a pair of ground wire contact; spring and breaker are formed; described spring is connected between ground wire moving contact reed and the breaker, described phase; zero; ground wire passes zero sequence current mutual inductor simultaneously.

2, leakage protecting plug according to claim 1, the iron core that it is characterized in that described zero sequence current mutual inductor is by beryllium Mo alloy or amorphous alloy or ultramicro-crystal alloy materials for support.

3, leakage protecting plug according to claim 1 is characterized in that described plug inside is provided with two independent storehouses, phase, zero, three utmost point latches be loaded in the same storehouse, the circuit elements parts of its earth leakage protective device are loaded on another storehouse.