Development of a high function portable pd measurement system for periodic inspection of power cable circuits

It is introduced that a new type of portable PD measurement system has been developed especially for the periodic inspection tour of power cable circuit in operation. Based on the causes of PD produced in cable and its accessories various PD sensors such as HFCT, UHF, AE and TEV have also been developed for site PD detection application. Therefore, this new type PDM equipment is designed and made to be matched with eight kinds of PD sensors, so it can perform multiple measurement functions in which signals from four same PD sensors or four different PD sensors can be detected. The signals can be analyzed at frequency domain with PC program like a spectrum analyzer and the signal waveforms can be recorded and be shown on the PC screen as analyzed at time domain like an oscilloscope, with which four-channel signals can be used for localization synchronously. This paper also gives two successful on-site PD measurement examples to show that how this kind of high-end PDM equipment can provide PD measurement and localization with high efficient and safety during operation.