CN201781261U

CN201781261U - Distribution box protection device

Info

Publication number: CN201781261U
Application number: CN2010205292037U
Authority: CN
Inventors: 崔新国; 高淑娟; 孙立强; 张延庆
Original assignee: 崔新国
Priority date: 2010-09-11
Filing date: 2010-09-11
Publication date: 2011-03-30
Anticipated expiration: 2020-09-11

Abstract

The utility model relates to an electric power protection device, in particular to a distribution box protection device, which adopts the technical scheme that the electric power protection device mainly comprises a distribution box, a power cord and a leakage protector; a live wire in the distribution box is respectively connected with watt-hour meters and household appliances of all households through the power cord and the leakage protector; a 220V AC contactor and a protection circuit are serially connected between a watt-hour meter and the leakage protector; a three-phase live wire is respectively connected at one end of the 220V AC contactor, and the other end of the 220V AC contactor is respectively connected with wiring terminals of the watt-hour meters of all the households, and a neutral wire is accordingly connected to the watt-hour meters of all the households. The electric power protection device has the benefits that the 220V AC contactor and the protection circuit are added at the back of the leakage protector, if the main neutral wire N burns out or is cut, the circuit breaker trips due to sudden increase of current, a coil of the AC contactor can not pull in, therefore the household electric appliances can be protected.

Description

The distribution box protective device

One, technical field:

The utility model relates to a kind of electric protection device, particularly a kind of distribution box protective device.

Two, background technology:

In family's power supply, many employing three-phase four-wire low-voltage electric power systems, distribution box are in use because lack protective device, or irrational use is broken down through regular meeting, through the power distribution cabinet zero terminal of the building head of being everlasting row and zero terminal loose contact, or blow zero line because of the cable overload; Zero line disconnects in the cable because wrong construction causes, and influences normal power supply.

Three, summary of the invention:

The purpose of this utility model is exactly the above-mentioned defective that exists at prior art, and a kind of distribution box protective device is provided, and can effectively protect household electrical appliance not burnt.

Its technical scheme is: mainly be made up of distribution box, power line and earth leakage protective device, live wire in the distribution box is connected ammeter and the household electrical appliance of using at each family respectively by power line and earth leakage protective device, serial connection A.C. contactor and protective circuit between described ammeter and earth leakage protective device, one end of described A.C. contactor connects three-phase firewire respectively, the other end connects the binding post of the ammeter at each family respectively, the ammeter at each family of the corresponding access of zero line; The circuit breaker of serial connection protective circuit on the described A.C. contactor.

The beneficial effects of the utility model are: use and protective circuit by add the alternating current 220V A.C. contactor behind earth leakage protective device, have only the binding post that could enter ammeter when ac contactor coil adhesive three-phase firewire respectively; If main zero line N blows or digs badly, circuit breaker also will trip because electric current increases suddenly, and ac contactor coil can't adhesive, thereby has protected the electric equipment in the family.

Four, description of drawings:

Accompanying drawing 1 is a circuit connection diagram of the present utility model.

Five, embodiment:

In conjunction with the accompanying drawings 1, the utility model will be further described:

The utility model mainly is by distribution box; power line; earth leakage protective device; A.C. contactor; circuit breaker is formed; described power line A; B; C is a live wire; N is a zero line; connect distribution box and earth leakage protective device by power line; described A.C. contactor is connected on live wire A; B; on the C; live wire A; B; C inserts three users' ammeter respectively; three ammeters of the corresponding access of zero line N; live wire; zero line forms the loop respectively and inserts household electricity by protector; be connected in series circuit breaker on the A.C. contactor, described power line A; B; C; N and ammeter junction are respectively equipped with binding post.

By behind earth leakage protective device, add the alternating current 220V A.C. contactor with and protective circuit, have only when ac contactor coil adhesive three-phase firewire and could enter table respectively 1., 2., binding post 3.; If main zero line N blows, dig badly, circuit breaker also will trip because electric current increases suddenly, and ac contactor coil can't adhesive, thereby has protected the electric equipment in the family.

Claims

1. distribution box protective device, mainly form by distribution box, power line and earth leakage protective device, live wire in the distribution box is connected ammeter and the household electrical appliance of using at each family respectively by power line and earth leakage protective device, it is characterized in that: serial connection 220V A.C. contactor and protective circuit between described ammeter and earth leakage protective device, one end of described 220V A.C. contactor connects three-phase firewire respectively, the other end connects the binding post of the ammeter at each family respectively, the ammeter at each family of the corresponding access of zero line; The circuit breaker of serial connection protective circuit on the described 220V A.C. contactor.