CN201656548U

CN201656548U - Double-loop power supply manual throwing device capable of preventing electric dazzling

Info

Publication number: CN201656548U
Application number: CN2010201259788U
Authority: CN
Inventors: 刘兴海; 张西周; 朱君
Original assignee: Xinjiang Bayi Iron and Steel Co Ltd
Current assignee: Xinjiang Bayi Iron and Steel Co Ltd
Priority date: 2010-03-09
Filing date: 2010-03-09
Publication date: 2010-11-24
Anticipated expiration: 2020-03-09

Abstract

The utility model discloses a double-loop power supply manual throwing device capable of preventing electric dazzling. The double-loop power supply manual throwing device comprises a work breaker and a backup breaker, wherein two breakers are respectively connected with a first incoming power supply and a second incoming power supply; the low-voltage output terminals of two AC transformers are respectively connected with the parallel loop of an accumulating capacitor, a first intermediate relay and a second intermediate relay through a single-phase full-wave rectifier bridge; the primary sides of the two AC transformers are respectively connected with an opening loop in parallel, that is to say, the positive terminals of the opening coils of two brakes are connected with a single-phase half-wave rectifier loop in series, and the negative terminals are respectively connected with the normally-closed contacts of the intermediate relays through a switch; and the primary sides of the two AC transformers are respectively connected with a closing loop in parallel, that is to say, the N terminals of the closing coils of the work brake is connected with a self-throwing transfer switch through the normally-close contact of the second intermediate relay, and the N terminal of the closing coil of the backup brakes are connected with the self-throwing transfer switch through the normally-close contact of the first intermediate relay.

Description

The electric double-cricuit supply of avoiding shaking is thrown device mutually

Technical field

The utility model relates to a kind of power supply and switches back-up device, and the electric double-cricuit supply of particularly avoiding shaking is thrown device mutually.

Background technology

The converter electric power system of steel plant generally all adopts the double-cricuit supply power supply, one the tunnel as working power, another road is as stand-by power supply, for the continuity that guarantees to smelt, power supply stability requirement to converter is higher, general normal employing double loop is thrown mode mutually, promptly utilize the decompression coil of circuit breaker to detect current supply power voltage, when supply power voltage less than rated voltage (exchange 380V) 15% the time work circuit breaker disconnect, auxiliaries-supply circuit-breaker automatic closing then, thus the continuity of power supply guaranteed.But it is stable inadequately and when other users break down on the electrical network, also can cause the voltage instantaneous of electrical network to fluctuate when electrical network, be commonly called as rolling, at this moment said system will be moved immediately, system has the power failure of moment during circuit breaker mutual throwing of moment, cause under the system that institute's carrying device such as frequency converter are reported to the police, contactor discharges, PLC is out of service etc., and then cause whole system to quit work, hinder to produce and normally carry out.

The utility model content

The purpose of this utility model is to provide a kind of double-cricuit supply that can avoid shaking electricity to throw device mutually, and the auxiliaries-supply circuit-breaker that occurs in the time of can avoiding the voltage instantaneous fluctuation effectively switches phenomenon, and the moment power failure appears in anti-locking system, guarantees the continuity of power supply.

The purpose of this utility model is achieved in that a kind of double-cricuit supply that can avoid shaking electricity throws device mutually, comprise work circuit breaker and back-up breaker, two circuit breakers link to each other with No. 1 incoming power and No. 2 incoming powers respectively, and the low-voltage output of two AC transformer is connecting storage capacitor and 1, No. 2 auxiliary relay in the electric loop of formation parallel with one another respectively by the single-phase full wave rectifier bridge; Two AC transformer primary sides in parallel respectively a sub-gate circuit, i.e. the anode of two the breaker open operation coils single phase half wave rectification loop of all connecting, the negative terminal of switching winding is respectively by the connecting normally-closed contact of auxiliary relay of switch; Two AC transformer primary sides in parallel respectively a closing circuit, the N end normally-closed contact by No. 2 auxiliary relays of breaker closing coil of promptly working is connecting hauls oneself willingly into change over switch, and the N end of back-up breaker closing coil links to each other with the said change over switch of hauling oneself willingly into by the normally-closed contact of No. 1 auxiliary relay.

The utility model device has mainly solved the mistrip problem of original system under system voltage fluctuation situation, design philosophy is when system voltage moment reduction, the trip signal time-delay is sent, thereby make this system can escape the moment of voltage fluctuation, main element is an electric capacity, utilizes the characteristic of electric capacity to realize this function.The utility model device can be applicable to all low pressure double loops and throws the stable inadequately occasion of electric power system, particularly line voltage mutually.

The utility model is simple in structure, and is cheap, and the auxiliaries-supply circuit-breaker that occurs in the time of can avoiding the voltage instantaneous fluctuation effectively switches phenomenon, and the moment power failure appears in anti-locking system, guarantees the continuity of power supply.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing.

Accompanying drawing is an electrical block diagram of the present utility model.

Embodiment

A kind of double-cricuit supply that can avoid shaking electricity is thrown device mutually, as shown in drawings, comprises work circuit breaker Q 1 and back-up breaker Q2, and two circuit breaker Q 1, Q2 link to each other with No. 1 incoming power and No. 2 incoming powers respectively.The low-voltage output of two AC transformer 1T and 2T is being connected storage capacitor C3, C4 and 1, No. 2 auxiliary relay 1K, the 2K in the electric loop of formation parallel with one another respectively by the single-phase full wave rectifier bridge, said storage capacitor C3, C4 are tunable capacitor.The primary side of two AC transformer 1T and 2T in parallel respectively a sub-gate circuit, the i.e. anode of two breaker open operation coil 1MX and the 2MX single phase half wave rectification loop of all connecting, the negative terminal of switching winding 1MX and 2MX are respectively by switch Q1, Q2 connecting normally-closed contact 1K, the 2K of auxiliary relay; The primary side of two AC transformer 1T and 2T in parallel respectively a closing circuit, the N end normally-closed contact 2K by No. 2 auxiliary relays of breaker closing coil 1XF of promptly working is connecting and is hauling oneself willingly into change over switch SK, and the N end of back-up breaker closing coil 2XF links to each other with the said change over switch SK that hauls oneself willingly into by the normally-closed contact 1K of No. 1 auxiliary relay.

In the accompanying drawings, 1XF, 2XF are the closing coil of circuit breaker, and 1MX, 2MX are the switching winding of circuit breaker.Switching winding MX changes direct current 110V power supply into by original alternating current 220V power supply;

D1, D2, D3, D4 are diode, and C1, C2, C3, C4 are electrochemical capacitor, and D1, D3, C2 form the single phase half wave rectification loop, are used for the sub-gate circuit of No. 2 power supplys, and D2, D4, C1 form the single phase half wave rectification loop, are used for the sub-gate circuit of No. 1 power supply;

1T, 2T are AC transformer, alternating current 220V are become exchange 20V, and it is direct current 19V that AC transformer will exchange the 20V rectification by the single-phase full wave rectifier bridge respectively, are used for capacitor C 3, C4 charging;

1K, 2K are direct current 24V auxiliary relay, by the mutual throwing under the auxiliary contact realization auto state of 1K and 2K;

SK is used for the manual and switching automatically of this device for hauling oneself willingly into change over switch, and each circuit breaker is manual operation when selection is manual, and this device can be realized automatically throwing mutually when selection is automatic.

The operation principle of the utility model device: as shown in drawings, when selecting switch to elect as when automatic, No. 1 power supply is a working power, and circuit breaker Q 1 is in "on" position, and circuit breaker Q 2 is in gate-dividing state:

1. when working power voltage moment is lower than 185V, the original system circuit breaker will trip immediately and throw into stand-by power supply certainly at this moment, and the utility model device can not trip this moment immediately, because capacitor C 3 contains electric energy, C3 and 1K constitute the loop, thereby make 1K keep do not discharge 2-3.5 time second, and then reach and escape this purpose of low-voltage in a flash.

2. when the working power dead electricity, C3 discharges to 1K, when the C3 both end voltage is lower than 25% (18V) of auxiliary relay 1K rated voltage, 1K discharges, this moment, normally closed auxiliary contact, switching winding 1MX and the capacitor C 1 of 1K constituted the loop, electric energy by capacitor C 1 makes the charged work of switching winding 1MX, thereby makes circuit breaker Q 1 tripping operation.

3. after circuit breaker Q 1 tripping operation, another normally closed auxiliary contact of 1K, closing coil 2XF and switch B2 constitute the loop, thereby finish the automatic closing of circuit breaker Q 2.

4. operation principle is identical when No. 2 power supplys are working power, and sequence of movement is opposite.

Claims

1. the double-cricuit supply that can avoid shaking electricity is thrown device mutually, comprise work circuit breaker and back-up breaker, it is characterized in that: two circuit breakers link to each other with No. 1 incoming power and No. 2 incoming powers respectively, and the low-voltage output of two AC transformer is connecting storage capacitor and 1, No. 2 auxiliary relay in the electric loop of formation parallel with one another respectively by the single-phase full wave rectifier bridge; Two AC transformer primary sides in parallel respectively a sub-gate circuit, i.e. the anode of two the breaker open operation coils single phase half wave rectification loop of all connecting, the negative terminal of switching winding is respectively by the connecting normally-closed contact of auxiliary relay of switch; Two AC transformer primary sides in parallel respectively a closing circuit, the N end normally-closed contact by No. 2 auxiliary relays of breaker closing coil of promptly working is connecting hauls oneself willingly into change over switch, and the N end of back-up breaker closing coil links to each other with the said change over switch of hauling oneself willingly into by the normally-closed contact of No. 1 auxiliary relay.

2. the double-cricuit supply that can avoid shaking electricity according to claim 1 is thrown device mutually, and it is characterized in that: said storage capacitor is a tunable capacitor.