Partial Discharge

Service Power Technologies

Partial discharge online monitoring system Maximizing the system performance

Are you aware of the condition of your assets? The proper functioning of substations and their components is a vital factor in electrical power supply networks and their unimpaired reliability is of paramount importance. For gas-insulated switchgear, as they are primarily used by industrial companies, the Service Power Technologies division of ABB Germany has developed an online partial discharge monitoring system (PDM) to continually monitor substations for partial discharge activities and to generate trend analyses in order to be able to assess vital process parameters and thus the current condition of the installation. The system will inform you early on if there is a need for intervention. This way, you will be in a position to implement an enhanced level of reliability and profit from a longer service life of the equipment and, at the same time, contribute to a highly reliable and uninterrupted power supply.

The Partial-Discharge Monitoring System is able to provide continuous monitoring of substations for partial-discharge activities, and to create the appropriate trend analyses.

1 Calibration tool | 2 On-site monitoring system 1

Service Power Technologies

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Monitoring system architecture

Why Online Monitoring? A partial discharge (PD) is a clearly localized partial dielectric breakdown in a limited section of an energized electrical insulation system. In gas-insulated switchgear (GIS), PD faults can occur anywhere as a result of a cavity, cracks, particles, or embedded particles. This condition can lead to unscheduled outages and thus to substantial economic damage. In the worst case, such faults could lead to costly grid failures. Drawing from our expert knowledge in the field of PD measurement and our longstanding experience as a manufacturer of gas-insulated substations, we designed an online monitoring system that is able to combine the following technical properties: – Ultra High Frequency (UHF) measuring method – Interference signal / noise suppression – Phase-resolved partial discharge representation

– A sensitivity level of