PD-SG1 TEV PD Location

The PD-SG1 is a dual transducer Switchgear PD detection instrument. The unit detects TEV signals generated by internal discharge, as well as acoustic discharge generated by surface tracking or corona.

Partial discharge activity inside metal clad high voltage plant induces small voltage impulses (called Transient Earth Voltages) on the surface of the metal cladding. TEVs travel around the cladding surface to the outside of the switchgear panel, where they can be picked up externally using capacitively coupled transducers.

Key Features

  • Ultrasonic detection of surface PD activity. Displayed on the LCD screen as dB reading, as well as audible signals through headphones.
  • Measurement of TEV signals generated by internal PD. Displayed on the LCD screen as dB reading.
  • Cycle Mode for viewing PD pattern in power cycle (Phi Q), allowing for the elimination of noise
  • Precedence Mode for location of PD in the assets under test
  • Bright LCD panel display for indoor and outdoor use

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Description

Distinguishing between Partial Discharge and Noise

The Problem

Partial Discharge (PD) is a localised breakdown of a small portion of a solid insulation system under high voltage stress. Once begun, PD causes progressive deterioration of insulating materials, ultimately leading to complete failure. It is therefore critical to be able to identify the PD source so it can be fixed quickly. However, one of the greatest problems in identifying PD is how you distinguish the discharge activity from general electrical noise (very often present in sub stations and switchgear).

The Solution

The pulses caused by each discharge are distributed across the AC power cycle in a distinctive pattern. By plotting the peak of each pulse detected, the PD SG1 displays a pattern that can be used to distinguish between genuine Partial Discharge activity and signals from electrical noise interference.

The PD-SGS is a dual transducer PD detector for Switchgear. The instrument detects TEV signals generated by internal discharge, as well as acoustic discharge generated by surface tracking or corona.

  • Measurement of TEV signals generated by internal PD
  • Ultrasonic detection of surface PD activity
  • Automatic Background Noise Detection
  • Level Mode and Trend Mode
  • Bright OLED screen display with dB readings
  • Audible output through headphones or built in speaker
PD-SG1 TEV PD Location