External interference: Although China has applied various new technologies and equipment to improve the stability of the power system operation, Relay Tester the anti-interference ability of the micro-relay protection in the power system is still relatively low, so under such circumstances ,Relay Tester The electrical relay protection system will be greatly increased by external interference, such as the interference of communication equipment, the influence of external jammers,Relay Tester the voltage amplitude is too large, etc., it is easy to make the logic elements to make erroneous analysis and judgment under the interference of these factors , And then execute the wrong behavior,Relay Tester which affects the action of its protection and affects the operation of the entire system.

Stealth failure refers to the fact that it does not affect the normal operation of the system,Relay Tester but will be triggered when some structure of the system changes,Relay Tester which will cause a large-area failure to occur together. It is the focus and difficulty of electrical relay protection research. The influence can gradually increase with the running time of the power system, and it is extremely hidden in the general early detection,Relay Tester so it is difficult to be found,Relay Tester but once a fault occurs, the power system will be redistributed after the relay correctly removes the fault In this operating state,Relay Tester it is very likely to cause erroneous actions caused by the protection system,Relay Tester thus affecting the effectiveness of the system's instructions; it is also for this reason that people have increased their research efforts. In the power system,Relay Tester the important transmission line is the main part of its failure, which is usually caused by incorrect setting or equipment failure.