GIS PD TESTER: MODEL 840U AND 841

To help in maintaining GIS ( gas insulated switchgear ) equipment we developed the Model 840 GIS tester which is designed to take the output signal from a Model 841 GIS sensor. The signal is interpreted by a dedicated microprocessor unit in the 840U which in turn sends digital data to the laptop PC. In the laptop PC the digital data is used to construct graphical representations of the PD activity.

The portable Model 841 is fitted with a high frequency amplifier matched to the typical PD signature of GIS equipment. It has a rechargeable Li-On battery for extended field use, and is connected to the 840U with a coaxial test cable. There is a swivel attachment on the 841 so it can be used on the end of a hot stick when required.