CN203839919U

CN203839919U - Multifunctional electric leakage protection device

Info

Publication number: CN203839919U
Application number: CN201320636138.1U
Authority: CN
Inventors: 汪龙渊
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-10-16
Filing date: 2013-10-16
Publication date: 2014-09-17
Anticipated expiration: 2023-10-16

Abstract

The utility model provides a multifunctional electric leakage protection device, wherein the device can achieve the novel, convenient, flexible, safe and reliable leakage protection. The device employs the combination of zero sequence current mutual inductors to achieve the purpose of the multifunctional electric leakage protection, especially a function of fixed-length electric leakage protection for a line. The device solves the contradiction between upper-stage and lower-stage electric leakage protection switches reasonably.

Description

Multifunctional earth-leakage protective equipment

Technical field:

The utility model relates to safety utilization of electric power electric leakage protection technology field, is specifically related to a kind of Multifunctional earth-leakage protective equipment with zero sequence current mutual inductor.

Background technology:

At present; there are the various switches of creepage protection function; be widely used in various electricity consumptions place [construction site, factory, cinema, market, office building, family etc.]; some place [as construction site]; not only there is earth leakage protective at switch-box place endways; also have total earth leakage protective at total electronic box place, what have has even also installed earth leakage protective at a point electronic box place.The object that we install earth leakage circuit-breaker is: in the time that leak current fault occurs in circuit somewhere, wish to be moved by the earth leakage circuit-breaker of directly controlling this circuit, cut off rapidly this circuit, and other earth leakage circuit-breaker akinesia is [as certain electric equipment generation leak current fault, it should be just only the earth leakage circuit-breaker action of controlling in the switch-box of this equipment, divide the earth leakage circuit-breaker in electronic box and total electronic box should not move], but reality is really not so, although electrician is the relevant parameters of strictly pacifying relevant requirements and select leakage switch, still often occur that the earth leakage circuit-breaker in switch-box and total electronic box moves simultaneously, earth leakage circuit-breaker in the even switch-box having does not move, total electronic box has moved on the contrary, this has just expanded the scope having a power failure, affect the normal power supply of other circuit, even cause certain loss, while also gives searching of leak current fault and processing brings difficulty.

Summary of the invention:

For solving above-mentioned practical problem, the utility model provides a kind of Multifunctional earth-leakage protective equipment, and this device is easy to use, flexible, safe and reliable.

The technical scheme that the utility model adopts is: one has multi-functional earth leakage protective device, comprises several [according to actual needs, general 3-5 is only just enough] same zero sequence current mutual inductor, a set of comprehensive tripping mechanism and some link lines.It is characterized in that: a zero sequence current mutual inductor and comprehensive tripping mechanism are arranged on one; other zero sequence current mutual inductor can be according to the earth leakage protective needs of actual track; add and be used in combination flexibly; in the time need only reaching the zero sequence current mutual inductor of above number of elements with two; need first by zero sequence current mutual inductor link line by certain polarity connection [being connected to parallel connection] between zero sequence current mutual inductor after; connect with comprehensive tripping mechanism, composition has the earth leakage protective device of certain function again.

Use a zero sequence current mutual inductor can form common earth leakage circuit-breaker now with comprehensive tripping mechanism; Use two zero sequence current mutual inductors can form circuit fixed length earth leakage protective device with comprehensive tripping mechanism, or composition is carried out the device of different residual operating current protections simultaneously to twolink: to use two above zero sequence current mutual inductors can form simultaneously many circuits are carried out to the earth leakage protective device of fixed length with comprehensive tripping mechanism.

The beneficial effects of the utility model are: a covering device has multiple creepage protection function; can combine according to actual needs; especially the fixed length creepage protection function to circuit, it is by thoroughly solving the protection zone problem of upper and lower level leakage switch, easy to use, flexible, safe and reliable.

Brief description of the drawings:

The earth leakage protective device [common earth leakage circuit-breaker] that Fig. 1 is made up of with comprehensive tripping mechanism a zero sequence current mutual inductor.

In Fig. 1: 1 comprehensive tripping mechanism, 2 zero sequence current mutual inductors, 3 circuits [tip represents power supply direction], A point represents the center of zero sequence current mutual inductor 2.

Fig. 2 has two zero sequence current mutual inductors [same] to go here and there same protected circuit, with the earth leakage protective device of comprehensive tripping mechanism composition.

In Fig. 2: 1 comprehensive tripping mechanism, 2 zero sequence current mutual inductors, 3 circuits [tip represents power supply direction], 4 zero sequence current mutual inductors, 5 link lines, A, 2 of B represent respectively the center [line length between A, B is generally no more than 1000 meters] of zero sequence current mutual inductor 2 and 4.

Fig. 3 has the earth leakage protective device that two parallel branch circuits simultaneously protected of 3 zero sequence current mutual inductors [same] with comprehensive tripping mechanism composition.

In Fig. 3: 1 comprehensive tripping mechanism, 2 zero sequence current mutual inductors, 3 circuits [tip represents power supply direction], 4 zero sequence current mutual inductors, 5 link lines, 6 zero sequence current mutual inductors, A, B, 3 of C represent respectively the center of zero sequence current mutual inductor 2,4,6.

Embodiment:

The utility model is described in further detail by reference to the accompanying drawings.

As shown in Figure 1, this earth leakage protective device is made up of [output of zero sequence current mutual inductor 2 is connected with the input of comprehensive tripping mechanism] with comprehensive tripping mechanism 1 zero sequence current mutual inductor 2.When circuit generation leak current fault below A point; zero sequence current mutual inductor 2 will induce zero-sequence current; line electrical leakage is larger; zero-sequence current is larger; electric leakage is once the setting value that reaches device; just can make comprehensive tripping mechanism action, cut off leak current fault circuit [in fact this is exactly the common earth leakage circuit-breaker using now].

As shown in Figure 2, this earth leakage protective device is by comprehensive tripping mechanism 1 and two same zero sequence current mutual inductors 2, 4 compositions, after being connected in parallel by link line 5, two zero sequence current mutual inductors access again the input of comprehensive tripping mechanism 1, connected mode between two zero sequence current mutual inductors has same polarity to connect that [direction of line current of going here and there is consistent or contrary, and the output of zero sequence current mutual inductor is that like poles are connected or unlike pole is connected] is connected with heteropolarity [went here and there line current direction unanimously or on the contrary, and the output of zero sequence current mutual inductor is that unlike pole is connected or like poles are connected] two kinds, the function of the earth leakage protective device that different connections forms is also different.In the time connecting for heteropolarity, if there is electric leakage between circuit A, B, only have zero sequence current mutual inductor 2 can induce corresponding zero-sequence current, zero sequence current mutual inductor 4 does not have zero-sequence current, synthetic zero-sequence current after their heteropolarities connect is exactly the zero-sequence current that zero sequence current mutual inductor 2 is exported, as long as leakage current reaches setting value between A, B, comprehensive tripping mechanism 1 just can line disconnection under the promotion of synthetic zero-sequence current; If the following line electrical leakage of B point; 2,4 two zero sequence current mutual inductors all can induce same zero-sequence current; synthetic zero-sequence current after their heteropolarity connects is zero; comprehensive tripping mechanism is not exported; be that whole device does not have leakage protection to the following circuit of B point; only the line electrical leakage between A, B is responsible for; namely this earth leakage protective device does not conflict with following other leakage switch installed of B point; the each circuit region of each pipe; the situation that can not occur to move together, Here it is circuit fixed length creepage protection function.In the time connecting for same polarity, if there is electric leakage between circuit A, B, also only have zero sequence current mutual inductor 2 can induce corresponding zero-sequence current, zero sequence current mutual inductor 4 does not have zero-sequence current, and the synthetic zero-sequence current after their same polarity connects is exactly the zero-sequence current [situation connects with heteropolarity] that zero sequence current mutual inductor 2 is exported, if the following line electrical leakage of B point, 2, 4 two zero sequence current mutual inductors all can induce same zero-sequence current, synthetic zero-sequence current after their same polarity connects is the twice of their single zero-sequence current, namely the leakage current of the following circuit of B point only needs A, the half of the leakage current of circuit between B, device just can produce synthetic zero-sequence current of a size, the residual operating current value that is earth leakage protective device circuit below B point is A, the half of circuit residual operating current value between B, Here it is a set of earth leakage protective device simultaneously to twolink respectively with the function of two kinds of residual operating currents protections.

As shown in Figure 3; this earth leakage protective device is made up of comprehensive tripping mechanism 1 and three same zero sequence current mutual inductors 2,4,6; AB, AC are two circuits in parallel, and zero sequence current mutual inductor 4,6 accesses comprehensive tripping mechanism 1 input after connecting with zero sequence current mutual inductor 2 heteropolarities with link line 5 respectively again.No matter the following or following circuit of C point of B point leaks electricity, and the synthetic zero-sequence current of this device generation is zero, there is no leakage protection.Circuit when between A, B or A, C leaks electricity; only have zero sequence current mutual inductor 2 to induce corresponding zero-sequence current; so device has leakage protection to circuit AB and AC; Here it is realizes the earth leakage protective function of fixed length [need the earth leakage protective parallel line of fixed length if add, just a multiplex same zero sequence current mutual inductor connects with zero sequence current mutual inductor 2 heteropolarities more again] to two circuits simultaneously.

Claims

1. a Multifunctional earth-leakage protective equipment; comprise three same zero sequence current mutual inductors (2,4,6); a set of comprehensive tripping mechanism (1) and some link lines (5); it is characterized in that; a zero sequence current mutual inductor is arranged on the top of protected circuit with comprehensive tripping mechanism (1); after being connected in parallel with link line according to certain polarity between zero sequence current mutual inductor, then receive the input of comprehensive tripping mechanism (1).