The microcomputer type harmonic elimination device is a new type of intelligent power resonance elimination device developed by our company. It is simple and convenient to use, does not need maintenance, and can quickly eliminate the ferromagnetic resonance of various frequencies, with high accuracy. At the same time, relevant information can be printed or transmitted to the superior monitoring system through the communication interface according to the needs of users, which is suitable for unattended substation. 

In the power system, ferroresonance occurs frequently, which will produce over-voltage and threaten the security of the system. Ferroresonance overvoltage can occur in any system of 3 ~ 222kv, especially in the power grid of 35kV and below, almost all internal overvoltage accidents are caused by ferroresonance. The over-voltage caused by ferroresonance lasts for a long time, even for a long time. In the frequency division resonance, the general overvoltage is not high, but the PT current is large, which is easy to overheat and explode; in the fundamental and frequency doubling resonance, the general current is not large, but the overvoltage is very high, which often damages the equipment insulation and causes malignant accidents.

It is suitable for small current power supply system with 380V, 3KV, 6kV, 10kV, 35kV and 66kV neutral point ungrounded or grounded by arc suppression coil. In case of ferroresonance, grounding or overvoltage fault in the system, the ferroresonance fault shall be eliminated and recorded, and the single-phase grounding and overvoltage fault shall be monitored and recorded. Note: the microcomputer harmonic elimination device can only eliminate the non permanent ferroresonance fault caused by external causes, and can not eliminate other Pt overvoltage caused by persistent external causes. For example: Pt high-voltage side fuse single-phase fuse and other conditions.