Microcomputer integrated protection device is an automatic device which can reflect the failure or abnormal working state of electrical equipment in power system and can be used for circuit breaker tripping or signal sending. Microcomputer-based protection plays an important role in the safe, stable and reliable operation of power system and the timely cut-off of faults. Generally speaking, microprocessor-based integrated protection devices which meet the following requirements are more durable.
1. Reliability: The reliability of the microcomputer integrated protection device is very important, and it can be the main cause of the accident. When a fault occurs within the scope of its protection, failure should not be made due to its own defects.
2. Sensitivity: Microcomputer integrated protection device should be able to accurately respond to faults and abnormal working conditions within the scope of its protection, with sensitivity and reliable action.
3. Selection: When the system fails, the microcomputer integrated protection device is required to cut off the fault equipment only, so that the fault-free equipment can continue to operate, so as to achieve the purpose of selective action.
4. Rapidity: If the system fails, if the fault can not be solved, the fault may be expanded. The longer the short-circuit current passes, the more serious the equipment damage. Therefore, after the failure of the power system, the microcomputer integrated protection device should solve the problem as quickly as possible.