motors, transformers the same winding circle short circuit between, so that the power supply system can't finish the conveying electricity. At this time, the relay protection will be very important. The main function of the relay protection system: protection, control, monitor, function, role accident analysis and accident treatment effect, automation function. The relay protection device in power system is the main role by accident prevention or narrow the scope of the accident to enhance the system reliability, electric power system is an important part of, is to guarantee the safe and reliable operation of the power system is one of the important technical measures. Now in power system, if not relay protection device, you will not be able to maintain the normal operation of the system.
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