CN2265016Y - Three-phase protector for phase interruption - Google Patents

Abstract

The utility model relates to a three-phase protector for phase interruption. The input end of the utility model is connected with a three-phase power supply, and the output end of the utility model is connected with a control loop; the utility model mainly comprises a housing, a transformer which is arranged in the housing and is connected with two phases of the three-phase power supply and a relay which is arranged in the housing and connected with the transformer. The utility model has the characteristics of simple structure, economy, convenient use and maintenance, strong anti-interference ability, strong electric attack resistance ability, small size, light weight, high operating sensitivity, high reliability, no unwanted operation, no action rejecting, short protection breaking time, no noise, no vibration, etc.

Description

The three-phase phase failure protector

The utility model belongs to the three-phase alternating current open phase protection.

The anti-interference open-phase solid-state protector of electronic type that the 3rd phase of nineteen ninety-five " low-voltage electrical apparatus " is introduced and No. 19 disclosed a kind of rectification, filtering, voltage stabilizing circuit of comprising of patent gazette the 10th volume; relatively the phase failure protector CN2164605Y of amplifying circuit and control circuit composition exists anti-surge ability low; need use zero line during use; the control capacity is little, shortcoming such as the long and inconvenient maintenance of break-time under the semi-load malfunctions.

The purpose of this utility model provides a kind of simple and reasonable, and work is sensitive reliable, the three-phase phase failure protector that overload capacity is strong.

The purpose of this utility model is achieved in that a kind of three-phase phase failure protector; its input 1,2,3 is connected with three phase mains A, B, C; output 4,5 is connected with control loop; its primary structure is to comprise the transformer B that is connected with two of three phase mains that is provided with in housing and the housing; with the relay J that transformer B is connected, relay J is connected in series with output.

Transformer B secondary coil is connected with rectification circuit Z, and rectification circuit is connected with relay J.

Because the utility model adopts two-phase power transformer, rectification circuit, relay to form; play the effect of open phase protection threephase load; have simple in structurely, economical, use easy to maintenancely, anti-interference anti-surge ability is strong; volume is little; in light weight, work is sensitive, reliable, not malfunction, not tripping; the protection break-time is short, advantages such as noiselessness and vibration.

Below in conjunction with drawings and Examples the utility model is further described.

Fig. 1 is circuit theory diagrams of the present utility model.

Among the figure: A, B, C: three phase mains; HK: unit switch, RD: fuse, RJ: thermal relay; 1,2,3: the phase failure protector input terminal; 4,5: phase failure protector outlet terminal, B: transformer, Z: rectification circuit; J: relay coil, contact; TA: stop button, QA: starting button, C: contactor coil, main contact, auxiliary normally open contact.

Its operation principle is as follows:

Three phase mains connects three input terminals 1,2,3 of phase failure protector respectively, and two outputs 4,5 of phase failure protector are connected with control loop respectively.After the unit switch HK closure, when phase shortage not, two-phase power transformer B energising, the relay J adhesive, contact J closure, control loop is in the preparation work state.Press starting button QA, the contactor coil C adhesive of switching on, main contact C, auxiliary normally open contact C closure, threephase load energising operation.Threephase load is in service, and during any phase power supply generation phase failure in the former limit of transformer B, transformer B loses voltage, relay coil J decompression, contact J separately cuts off control loop, contactor coil C decompression discharges, and main noddle on contactor C, auxiliary normally open contact C separate, and threephase load is out of service.When another phase power supply generation phase failure, the control loop no-voltage, contactor is in release condition, and main noddle on contactor C, auxiliary normally open contact C separate, and load can not move, and this moment, circuit was in open phase protection state, fail to start.After treating that phase failure power up is normal, control loop and main circuit are in the preparation work state.

Relay coil is direct current when using rectification circuit in the phase failure protector, and relay coil is for exchanging when not using rectification circuit.

Through experiment and detection on the spot, the utility model reliable operation, temperature rise is normal, and detecting electric current therebetween is 0.0019A.

Three-phase voltage degree of asymmetry＜5% o'clock: not malfunction, not tripping;

During rated voltage 70-110%: working properly;

During less than rated voltage 55%: discharge automatically;

Phase failure starting: appoint to lack a phase time fail to start;

Phase failure during operation: the phase failure suddenly, protector moved less than 1 second.

Claims (2)

1, a kind of three-phase phase failure protector; its input (1,2,3) is connected with three phase mains (A, B, C); output (4,5) is connected with control loop; it is characterized in that it comprises the transformer B that is connected with two of three phase mains that is provided with in housing and the housing; with the relay J that transformer B is connected, relay J is connected in series with output.

2, three-phase phase failure protector according to claim 1 is characterized in that transformer B secondary coil is connected with rectification circuit Z, and rectification circuit is connected with relay J.

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