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Differential relay works, common models

          The strength of the company, product prices, where I recommend you use the company's differential protection devices produced by the 995 transformer differential protection and control devices, 996 motor differential protection and control devices, 998 generator differential protection and control devices , The price is less than 6,000 yuan, is your best choice.

Transformer differential protection device.jpg 

995 Transformer Differential Protection and Control Devices  

  Motor differential protection device.jpg

 996 Motor Differential Protection and Control Devices

Generator differential protection device.jpg

998 Generator Differential Protection and Control Devices

          Differential relay, also known as differential protection relay, it is widely used in power systems, generators, motors, transformers and bus relay protection , simply to compare the current across the protected equipment, normal, two When the end currents cancel one another out and the internal short-circuit occurs, they flow into the interior to start the relay. The outlet makes the switch trip to protect the generator, the motor and the transformer.

The working principle of differential relay

          The basic principle of differential relay is AC magnetic brake, differential winding access protection differential loop, balance and brake winding access loop, the role of process is under normal circumstances or through Short circuit, through the brake winding current transformer secondary current or all short-circuit current, brake amp turns to produce two parts of the magnetic flux, part of the magnetic flux in the local loop, its role is to make the core saturation, automatically Increase the operating current, thus avoiding the relay malfunction, which is the so-called AC magnetic braking. The effect of this part of the flux, the four brake windings are independent of each other, there is no correlation, it will not occur with the secondary winding electromagnetic induction. The braking ampere turns also produce another part of the flux ΦZC, which circulates along the entire magnetic circuit. And in the secondary winding in the induction potential, which is part of the brake winding from the work of the role of the winding.

Differential Relays Several common types of 

BCH-1-type differential relay 

          Uses: Relay with a brake winding, the two windings and three-winding power transformer single-phase differential protection.  

          Structure Description: This relay consists of DL-11 electromagnetic current relay (actuator) and a fast saturated converter (hereinafter referred to as converter). The relay has brake windings which form some of the major technical features of the differential relay such as braking characteristics, avoidance of inrush current characteristics, and performance of an autotransformer that eliminates unbalanced current effects. 

BCH-1 type differential relay wiring diagram.gif

BCH-2 type differential relay

          Purposes: BCH-2 type differential relay (hereinafter referred to as a relay) for a single-phase two-winding power transformer or three-winding of the alternator and the differential protection lines, as the main protection.  

          Structure of the differential relay consists of two parts: DL-11-type current relays and intermediate saturable converter (hereinafter referred to as converter). The former as an executive component, which has short-circuit windings, which constitute some of the main technical performance of differential relays, such as DC bias magnetic characteristics to eliminate unbalanced current effect of the autotransformer performance.

BCH-2-type differential relay wiring diagram.jpg


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