Partial discharge signal detection device and ring main unit

The invention relates to a partial discharge signal detection device and a ring main unit. The partial discharge signal detection device comprises a long-wave UVA sensor, an analog-to-digital converter and a controller. According to the embodiment of the invention, the long-wave UVA sensor is arranged to acquire the long-wave UVA optical signal in the ring main unit, and the long-wave UVA opticalsignal is the optical signal with the strongest intensity in the partial discharge signal, so that the optical signal can be detected to the greatest extent by detecting the long-wave UVA optical signal, that is to say, the partial discharge signal is the partial discharge signal of the ring main unit, so that the detection sensitivity of the partial discharge signal detection device is greatly improved. According to the embodiment of the invention, the technical problems that a partial discharge signal is generally weak and a worker sometimes cannot accurately detect the partial discharge signal in the prior art are