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Relay protection is a very important technology in power system. Its basic task is to protect the healthy operation of power system, realize rapid fault detection and isolation, and avoid fault expansion and system collapse.
The relay protection system can quickly monitor the abnormal situation in the system and trigger the corresponding protection action according to the preset protection strategy, thus protecting the safe operation of the equipment. Relay protection plays a vital role in the stability and reliability of power system.
Basic principle of relay protection
Relay protection system realizes fault detection and protection by sensing current, voltage, power and other signals in power system, using electromagnetic relay or digital relay. When there is a fault or abnormal situation in the power system, the relay protection system will pass electrical signals or communication signals;
Trigger the action of the circuit breaker, isolate the fault point and maintain the stable operation of the power system. The basic principle of relay protection is to make accurate fault judgment and protection actions according to the characteristics of different fault types by monitoring and analyzing various parameters in the power system.
Main functions of relay protection
Relay protection system has many functions, including over-current protection, differential protection, protection equipment calibration and equipment fault detection. Among them, overcurrent protection is the most commonly used function, which is used to detect overcurrent in power system, trigger protection action and prevent electrical equipment from being damaged due to overload or short circuit.
Differential protection is mainly used to detect equipment failure in power system and compare it with relevant current signals to judge whether equipment failure occurs. Relay protection can also control and monitor the correctness of electrical equipment and ensure the normal operation of the equipment.
Development trend of relay protection
With the continuous development of power system, relay protection technology is also developing. Traditional electromagnetic relay has been gradually replaced by digital relay, and digital relay protection system has higher reliability and functionality.
In addition, the development of intelligent relay protection system has become the current trend. Intelligent relay protection system can automatically sense the working state and load changes of power system, automatically adjust protection parameters, and realize more accurate and efficient protection control. The application of relay protection technology in smart grid, power internet and other fields will also be further expanded to promote the safe and stable operation of power system.