CN201230077Y - Leakage protection plug - Google Patents

Abstract

The utility model discloses a leakage protection plug, which comprises a plug, a shell, phase, null and earth sheet copper plug pins, a zero sequence current mutual inductor installed among a phase line, a null line and an earth line, a testing circuit, a sampling amplification circuit, a direct-current power supply circuit, a breaker and a relay; wherein, the output ends of the zero sequence current mutual inductor are connected with the input ends of the sampling amplification circuit; the breaker is provided with an earthing unit which can be first connected with the earth pole and then connected with the phase and null poles and can simultaneously break up the phase, null and earth poles; the earthing unit comprises a pair of earth line contacts, springs and the breaker; and the springs are connected between the earth line contacts and the breaker. The leakage protection plug has the following characteristics: part of the earth line passes through the zero sequence current mutual inductor, the other part does not pass through the zero sequence current mutual inductor, and after being wound, the phase line and the null line pass through the zero sequence current mutual inductor. The leakage protection plug not only can prevent the electric shock accident caused by an electric appliance but also can prevent the electric shock accident caused by a power source other than electric appliances, and meanwhile, the leakage protection plug can ensure that the leakage values produced by the earth line, the phase line and the null line are different in order to meet requirements on different leakage current values.

Description

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, and its ground wire is provided with a leakage indicator, is provided with a zero sequence current mutual inductor between phase, the zero line.Leakage indicator and current transformer can clash mutually under certain conditions, cause to cut off the power supply.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; all be the first phase failure, zero line, the disconnected ground wire in back, if but disconnected earlier during actual local tape electricity; prolonged the time of getting an electric shock on the contrary, the easier generation that causes human casualty accident.For this reason, just this plug is improved, technical scheme after the improvement also comprises 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, on described breaker, be 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; Though this leakage protecting plug has been realized that the arbitrary utmost point can both disconnect when electric leakage takes place simultaneously with all of circuit and has been connected; but; because phase, zero, ground wire pass zero sequence current mutual inductor simultaneously; so the electrical leakage of phase, zero line, ground wire is identical; thereby do not satisfy the requirement of the many specifications of leakage current value, make its leakage current value be restricted.

The utility model content

In view of the problem that background technology exists, the utility model provides a kind of phase, zero, ground wire to produce the leakage protecting plug of different electrical leakages.

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, on described breaker, be 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, it is characterized in that wherein the part of ground wire is passed zero sequence current mutual inductor, another part does not pass zero sequence current mutual inductor, described phase, zero line passes zero sequence current mutual inductor after twining again; The iron core of described zero sequence current mutual inductor is by beryllium Mo alloy or amorphous alloy or ultramicro-crystal alloy materials for support; 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; Thermal-shutdown circuit also is installed on this plug.

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.The part of ground wire is passed zero sequence current mutual inductor, another part does not pass zero sequence current mutual inductor, promptly ground wire is shunted, after passing zero sequence current mutual inductor again after described phase, zero line twine, the electrical leakage difference that its phase, zero, ground wire produce, thereby can satisfy the demand of different leakage current values.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, and its phase, zero, the sensible sampling amplification circuit of the shared testing circuit of earth polar residual current are realized reliable disjunction, have 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.Thermal-shutdown circuit also is housed simultaneously.When inserted sheet causes temperature to surpass certain value because of certain reason, can cut off phase, zero, ground wire automatically.4, the utility model ground wire adopts a part to pass zero sequence current mutual inductor; Phase, zero line pass zero sequence current mutual inductor again after twining, thereby have guaranteed the reliability of detection of electrical leakage and the practicality of different electrical leakages better.

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, relay (not drawing among the figure), 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, described ground wire 2 parts are passed zero sequence current mutual inductor 7, another part does not pass zero sequence current mutual inductor 7, and phase, zero line 12,13 passed zero sequence current mutual inductor 7 after twining again; 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; Wherein the part of ground wire is passed zero sequence current mutual inductor, and another part directly passes zero sequence current mutual inductor, and phase, zero line are twined a few and passed zero sequence current mutual inductor again.So the electrical leakage that its phase, zero, ground wire occur is different.Therefore just can be applied on the electrical equipment of different size.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, level that is enough to make the controllable silicon conducting of sampling amplification circuit 3 outputs, the controllable silicon conducting, release 9 is threaded off, phase, zero, ground wire are cut off in breaker 14 actions, have realized the extremely whole disconnection of power supply three, thereby have guaranteed user's life security.The utility model is equipped with thermal-shutdown circuit in addition, when inserted sheet causes temperature to surpass certain value because of certain reason, can cut off phase, zero, ground wire automatically.

Claims (4)

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; on described breaker, be 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; it is characterized in that wherein the part of ground wire is passed zero sequence current mutual inductor; another part does not pass zero sequence current mutual inductor, described phase; zero line passes zero sequence current mutual inductor after twining again.

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.

4, leakage protecting plug according to claim 1 is characterized in that also being equipped with on this plug thermal-shutdown circuit.

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