What should you watch out for when selecting protective relays?
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1. All the protection device hardware of a substation must be standardized and completely interchangeable. The hole size of the protection device should be completely unified to facilitate the support of operation and maintenance and reduce spare parts.
2. The reliability of the microcomputer protection depends on the software judgment is reasonable and complete, such as the standby power supply self-invested device should have the inlet current as the locking criterion, that is, when the busbar three-phase loss of voltage, the corresponding input line has power, this time Reported PT broken, locked prepared to vote.
3. The microcomputer protection device has a complete type test application, and the main device and the high-pressure ultra-high-pressure device should also have a dynamic test report. If a complete main transformer protection must have a test report, the main transformer accident is complicated and affected by various factors. There are many, and the main transformer is expensive and the loss is too large during an accident.
4. When selecting the protection device, it is necessary to consider the protection setting error and the measurement accuracy. And when making full use of the hardware and software resources of the microcomputer protection device, additional functions such as harmonic wave recording, fault location, and measurement can be obtained.
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