I. Basic Definition and Use
Frame circuit breaker is a kind of electrical equipment with overload, short-circuit and under-voltage protection functions.It is mainly used in the main circuit and control circuit of the power system, as well as the protection and control of large motors, generators, transformers and other power equipment.Frame circuit breaker has the features of strong breaking capacity, easy operation, safety and reliability, etc. It is an indispensable and important component in the power system.
II. Structure characteristics
The structure of frame circuit breaker usually consists of contact system, arc extinguishing system, operating mechanism, disconnector, auxiliary contacts and shell and other parts.Among them, the contact system and arc extinguishing system are the key components of circuit breaker to realize breaking and connecting circuit; the operating mechanism is used to control the closing and breaking of circuit breaker; the tripper is based on the fault conditions in the circuit, such as overload, short circuit or undervoltage, etc., automatically or manually to make the circuit breaker trip; the auxiliary contacts are used to realize the circuit breaker's status indication, signal transmission and chain control and other functions; the shell plays the role of protecting the internal components and preventing electric shock.The shell protects the internal components and prevents electric shock.
III. Working Principle
The working principle of frame circuit breaker is based on electromagnetic induction and arc extinguishing principle.When the current in the circuit exceeds the set value, the striker will sense the change of current and generate magnetic force, so that the operating mechanism will act to break the circuit.At the same time, the arc extinguishing system will generate a strong magnetic field and airflow, which will rapidly stretch and cool the arc, and finally extinguish the arc to ensure the safe disconnection of the circuit.
IIII. the performance characteristics
Strong breaking capacity: the frame circuit breaker has high breaking capacity, which can quickly cut off the short-circuit current and prevent the fault from expanding.
Easy to operate: circuit breakers are usually operated manually or electrically, which is easy and quick to operate and easy to maintain.
Safe and reliable: the circuit breaker has a variety of protection functions, such as overload protection, short circuit protection, undervoltage protection, etc., which can ensure the safe operation of the power system.
Strong adaptability: the frame circuit breaker can be customized according to different usage environments and demands, such as rated current, breaking capacity, operation mode, etc. can be adjusted according to needs.
V. Application fields
Frame circuit breakers are widely used in power distribution networks at all levels of the power system, including power plants, substations, industrial plants, commercial buildings and other places.It can be used to protect and control all kinds of electric equipment, such as motors, generators, transformers, etc., to ensure the stable operation of the power system.
VI. Development trend
With the continuous development of the power system and the improvement of the level of intelligence, the frame circuit breaker is also constantly innovating and developing.Future frame circuit breakers will pay more attention to intelligent, networked, modular and other aspects of the design, in order to meet the power system's demand for efficient, reliable and safe.At the same time, with the rapid development of new energy and smart grid, frame circuit breakers will also face more challenges and opportunities.