CN2469599Y

CN2469599Y - Multipurpose protector for low-voltage distribution system

Info

Publication number: CN2469599Y
Application number: CN 01213283
Authority: CN
Inventors: 殷侨
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-01-12
Filing date: 2001-01-12
Publication date: 2002-01-02
Anticipated expiration: 2011-01-12

Abstract

The utility model discloses a protector for a low-voltage distribution system. The protector comprises a fuse protector and an AC contactor; and is characterized in that a three-phase fuse protector is connected with a sampling circuit formed by C1 and R1, C2 and R2, and C3 and R3 that are connected in a star shape. A zero overpass transformer T is arranged between a star-shaped connection point and a ground wire. The primary two ends of the zero overpass transformer are connected with a bridge type rectifying circuit that is composed of D1, D2, D3 and D4; wherein the negative electrodes D1 and D3 and the positive electrodes D2 and D4 are respectively connected to the voltage coil of a closed contact relay K, the two contacts E and F of the relay K are respectively connected to the pull-on voltage coil of the AC contactor. The utility model has simple structure and can be arranged conveniently; and resolves the issue of liability claims for injuries to the user and equipment accidents caused by the equipment out of repair or other factors.

Description

The low-voltage distribution system protectors of using more

The utility model relates to a kind of distribution system protector, a kind of specifically low-voltage distribution system protector.

At present, open-phase protection is not set generally in low-voltage distribution system, so when transformer high-voltage side or low-pressure side phase shortage, thereby the damage of three-phase electric power apparatus often caused; And during owing to zero line break, cause the damage of single-phase household electrical appliance in the three-phase four-wire system circuit.

The purpose of this utility model provides a kind of low-voltage distribution system protector that can stop power supply automatically when phase shortage or zero line break.

The utility model is to realize its goal of the invention by the following technical solutions; a kind of low-voltage distribution system protector of using more; it comprises fuse; A.C. contactor; Y-connection has by C1 and R1 under three-phase fuse; C2 and R2; the sample circuit that C3 and R3 form; between Y-connection point and zero line, be serially connected with a zero passage transformer T; elementary two ends at zero passage transformer T are connected to one by D1; D2; D3; the bridge rectifier that D4 forms; an i.e. termination D1 positive pole; the D2 negative pole; another termination D3 positive pole; the D4 negative pole; D1; the negative pole of D3 and D2; the positive pole of D4 is connected on the potential winding of normally-closed contact relay K, two contact E of relay K; F is connected on the pick-up voltage coil of A.C. contactor.

Described R1, R2, R3 are metal oxidation resistance for RJ-0.25W-1M Ω, described C1, C2, C3 are withstand voltage 〉=630V0.47 μ F metal paper dielectric capacitance, described D1, D2, D3, D4 are withstand voltage 1000V/1A4007 rectifier diode, described zero passage transformer T is 1VA, 220/6-24V transformer, described relay is for having normal idle contact, by the relay of contact stream 20A, 24V voltage.

Because adopt technique scheme, the utility model has been realized goal of the invention preferably, have simple in structurely, easy for installation, in bad repair or other reason causes the professional liability problem of user's person and equipment breakdown generation because of equipment also to have solved power supply department.

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

Below in conjunction with accompanying drawing the utility model is further described.

By accompanying drawing as can be known, it comprises fuse the utility model, A.C. contactor, Y-connection has by C1 and R1 under three-phase fuse, C2 and R2, the sample circuit that C3 and R3 form, between Y-connection point and zero line, be serially connected with a zero passage transformer T, elementary two ends at zero passage transformer T are connected to one by D1, D2, D3, the bridge rectifier that D4 forms, an i.e. termination D1 positive pole, the D2 negative pole, another termination D3 positive pole, the D4 negative pole, D1, the negative pole of D3 and D2, the positive pole of D4 is connected on the potential winding of normally-closed contact relay K, two contact E of relay K, F is connected on the pick-up voltage coil of A.C. contactor.Its concrete parameter is that described R1, R2, R3 are metal oxidation resistance for RJ-0.25W-1M Ω, described C1, C2, C3 are withstand voltage 〉=630V0.47 μ F metal paper dielectric capacitance, described D1, D2, D3, D4 are withstand voltage 1000V/1A4007 rectifier diode, described zero passage transformer T is 1VA, 220/6-24V transformer, described relay is for having normal idle contact, by the relay of contact current 20A, 24V voltage.

Operation principle of the present utility model: when operate as normal, relay K is not worked; When three-phase operating voltage unbalanced value is 65-80V or zero line open circuit, relay work, its normally-closed contact disconnects, thereby makes the A.C. contactor open circuit, cuts off the electricity supply.

The utility model and thermal relay, earth leakage protective device can be combined to Full Featured low-voltage distribution system comprehensive protection device, can also use as three phase electric machine protecting single device.

The utility model also is adapted to adopt the distribution system of DW series air circuit.

Claims

1; a kind of low-voltage distribution system protector of using more; it comprises fuse; A.C. contactor; it is characterized in that Y-connection has by C1 and R1 under three-phase fuse; C2 and R2; the sample circuit that C3 and R3 form; between Y-connection point and zero line, be serially connected with a zero passage transformer T; elementary two ends at zero passage transformer T are connected to one by D1; D2; D3; the bridge rectifier that D4 forms; an i.e. termination D1 positive pole; the D2 negative pole; another termination D3 positive pole; the D4 negative pole; D1; the negative pole of D3 and D2; the positive pole of D4 is connected on the potential winding of normally-closed contact relay K, two contact E of relay K; F is connected on the pick-up voltage coil of A.C. contactor.

2, the low-voltage distribution system protector of using according to claim 1 more; it is characterized in that described R1, R2, R3 are metal oxidation resistance for RJ-0.25W-1M Ω; described C1, C2, C3 are withstand voltage 〉=630V 0.47 μ F metal paper dielectric capacitance; described D1, D2, D3, D4 are withstand voltage 1000V/1A 4007 rectifier diodes; described zero passage transformer T is 1VA, 220/6-24V transformer; described relay is for having normally-closed contact, by the relay of contact stream 20A, 24V voltage.