An electrical equipment discharge detecting device based on ultraviolet-power is developed using PMT.Around the ultraviolet detection in "blind"area

the system of sensor is designed and its response characteristics are analyzed.The overall structure of the system

hardware and software design of signal processing are presented.The ultraviolet-power measurement is carried out by numerical integration.Simulation detecting tests on spark discharge and needle plate discharge are carried out by the new device

and it presents that the device can accurately detect the ultraviolet radiation of the discharge and the strength of the discharge to linear response

and it can get the energy basis of the equipment discharge.The device is stable and reliable.It has high sensitivity

strong anti-interference and good linearity.