Primary harmonic elimination device is a common equipment in power system. For the sake of safety and security, users generally install primary harmonic elimination device on the primary side of voltage transformer to add a layer of protection for equipment operation.

        The conventional primary harmonic elimination device is installed between the neutral point of Pt primary winding and the earth, which is mainly installed in PT cabinet. The common primary harmonic elimination device in the general market is installed indoors. Since there are equipment installed indoors, there must be equipment installed outdoors, but the demand for equipment installed outdoors is small, so the equipment installed outdoors is a special customized type.

        If the conventional primary harmonic elimination is installed outdoors, it will be affected by moisture, resulting in insensitivity of the device and serious scrapping of the device. If the primary harmonic elimination device wants to be installed outdoors, it must first be moisture-proof. This is also customized according to the needs of different users.