The online Partial Discharge Monitoring System (PDMS) from ohv diagnostic is a comprehensive monitoring system for assessing performance of the dielectric condition in rotating machines. By way of long-term monitoring of partial discharge behavior, the operational reliability of the insulation in critical machines can be assessed on real-time basis. And it helps generate valuable information for maintenance planning and repairs when they are required. Or in many cases PD assessment can help avoid or postpone the inspection and maintenance plans to prioritize the operational availability of the assets. The key element of the PDMS is the partial discharge data acquisition (DAQ) unit which detects the high frequency PD impulses from the sensors, converts them into data packages sending them via fiber optic cable to the server. The partial discharge data acquisition unit consists of a multiplexer with several inputs as per application, signal conditioning, an analogue/digital converter, a digital signal processor converting the PD impulses to time stamped PD and Voltage data. A PDMS generally includes data acquisition units with sensors and a server together with data visualization, storage and connectivity facilities, such as a workstation or an interface to a SCADA or DCS system. The specific configuration and topology strongly depends on the assets to be monitored and requirements to data acquisition and analysis. The DAQ unit are integrated in a single housing. They are assembled in a weatherproof Ingress Protection (IP) class IP55 cabinet.

Sensing Features

■       Meets applicable IEC and IEEE standards

■       Covers IEC, broadband and UHF frequency range

■       High sensitivity, excellent signal to noise ratio