Relay protection is an anti-accident automation measure that studies power system faults and abnormal operating conditions that endanger safe operation. The basic task is to automatically remove the faulty equipment from the system in the shortest time and minimum area that may be realized when the power system fails or abnormal conditions, or send a signal to eliminate the root cause of the abnormal working condition by the duty officer to alleviate Or avoid damage to the equipment and the impact on the power supply to the adjacent area.
To complete the relay protection function, many related secondary equipments are needed, such as voltage and current transformers for converting the voltage and current of the primary equipment, and secondary cables. The solid state relay is an important component in the relay protection device. The following two common faults of the solid state relay are analyzed.
The faults of solid state relays mainly include overheating and overcurrent and overvoltage.
1. Solid state relay heating
Solid state relays have a certain power loss on their internal chips during normal operation. This power loss is mainly determined by the product of the output voltage drop of the solid state relay and the load current, and is consumed in the form of heat. Therefore, the heat dissipation directly affects the reliability of the solid state relay operation, and the excellent thermal design can avoid failure and damage caused by poor heat dissipation.
2. Solid state relay overcurrent and overvoltage
When the relay is used, the overcurrent and load short circuit will cause permanent damage to the internal control thyristor of the solid state relay. Consider adding a fast fuse and air switch to the control circuit to protect it. (Selecting the relay should select the product output protection, built-in voltage Sensitive resistance absorption loop and RC snubber, which can absorb surge voltage and improve dv/dt tolerance); fast fuses and air switches are common overcurrent protection methods. The quick-blow fuse can be selected at 1.2 times the rated operating current. Generally, a small fuse can be used. Pay special attention to load short circuit, which is the main cause of damage to solid state relay products.
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