Product Information; Pd-Sgs; Partial Discharge - Baur PD-SGS User Manual

P D-S G S
3 P
RODUCT INFORM ATION
3.1

PD-SGS

The BAUR handheld online PD detector PD-SGS is a first level partial discharge (PD)
detection device designed for use in distribution voltage substations. It enables network
operators to carry out simple routine tests that will identify discharge activity in switchgear
and accessories.
The battery-operated portable device has a live display that shows a quantified level of
detected PD activity. A colour-coded traffic light system indicates when detected levels
exceed the pre-set thresholds.
The PD-SGS has a built-in TEV sensor for capacitive coupling to switchgear and a built-in
ultrasonic sensor for detection of surface discharge and tracking. Headphones are also
supplied to help the user when working in noisy environment.
The PD-SGS is supplied with a battery-operated function tester PD-FT that should be used
to verify the correct operation of the device before use.
The PD-SGS is a non-intrusive test device therefore PD can be identified and located whilst
the equipment remains live.
3.2

Partial discharge

Partial discharge (PD) is an electrical discharge that does not completely bridge the space
between two conducting electrodes. The discharge may be in a gas filled void in a solid
insulating material, in a gas bubble in a liquid insulator or around an electrode in a gas.
When partial discharge occurs in a gas, it is usually known as corona.
Partial discharge is generally accepted as the predominant cause of long term degradation
and eventual failure of electrical insulation. As a result, its measurement is standard as part
of the factory testing of most types of high-voltage equipment. In-service monitoring of
equipment for PD gives an advance warning of pending insulation failure. This allows a plant
operator to take remedial action during planned outages.
Partial discharge often occurs under normal working conditions, gradually deteriorating the
dielectric until it can no longer withstand the electrical stress and fails. By detecting this PD
activity while the equipment is in operation, failure can be avoided.
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