Leakage current on high voltage insulators is a complex phenomena directly related to insulating material degradation and surface pollution.
CT Lab has developed an On-line Leakage Current Analyser (OLCA) capable of monitoring leakage current present on high voltage insulators or bushings while they are in service. The same instrument also records different weather parameters simultaneous with the leakage current data.
A comprehensive Data Management software package accompanies each instrument. This package is continuously under development and is used to completely manage all data captured in an Insulator Pollution Test Station. This Windows 95/NT4 based software allows the user to:
· View Real-time leakage current data and waveforms
· Automate remote data collection
· Manage large quantities of captured data
· Graphically display all measured data
· Captures and displays round robin pollution monitoring study test protocol drafted by Cigre
· Study the effects of it on material aging
· Determine the mechanism of flash-over
· Direct indication of pollution levels
· Determine relations between different environmental parameters and leakage current
· Determination of environmental and climatic parameters that have the largest effect on aging
 Sensor installed underneath CT bushing platform. |
 Metal strap around bushing to trap leakage current. |
 Sensor underneath CT. |
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