DC circuit breaker

The topological principles of DC Circuit breakers are complex and diverse. According to the different key breaking devices in DC circuit breakers, DC circuit breakers can be divided into three categories: mechanical DC circuit breakers, all solid state DC circuit breakers, and a combination of mechanical switches and solid state switches. Hybrid DC circuit breaker.

1. What is a DC circuit breaker

The DC circuit breaker has super-class current-limiting performance, which can accurately protect relay protection and automatic devices from overload, short-circuit and other fault hazards. The DC circuit breaker has the advantages of current limiting and arc extinguishing capabilities. After a large number of comprehensive scientific tests, it can achieve full selective protection among the main (sub) screen, protection screen, and relay screen in the DC system below 3000Ah.

2. Working principle of DC circuit breaker

The working principle is similar to that of AC short-circuit, but the application situation is different. Generally speaking, the switch is divided into operating mechanism, arc extinguishing system, contact system (main circuit), trip unit (also divided into mechanical thermal magnetic type, Electronic type, etc.).

3. DC circuit breaker function

Power system In power systems with large capacity and high voltage such as power plants and substations, the DC system provides reliable power for relay protection, operation control, signal and sound, and emergency lighting. Small DC circuit breakers are the most important in the DC system. One of the important components, its stable and reliable operation will directly ensure the safety of the entire power system. The vigorous development of the DC power supply information industry has ushered in the great development of the DC power supply industry such as communication power supply, EPS, UPS, etc. Base stations and data centers have sprung up on the land of China. In order to ensure the high precision requirements of DC power supply, DC power supply The DC circuit breaker, which is the most important operation and protection component in the feeder circuit at all levels in the power supply, plays a very important role in protecting the equipment and limiting the scope of the accident with its reliable selective grading cooperation. Rail transit and electric locomotives At present, my country’s urban rail transit system uses DC power supply. Most of its DC power supplies are provided by high-power silicon rectifiers, and the components of the silicon rectifiers have higher requirements for DC grid protection components due to their low overload capacity. A quick analysis of the important components of DC circuit breakers in rail transit. In the ship’s power system and electric propulsion system, the DC circuit breaker is one of the very important components. It implements protection for the faults of the power distribution system and electrical equipment, and adopts various protections to ensure the safety of the ship’s power supply system and electrical equipment.