EATON ELECTRICAL
16
Predictive Diagnostics
2 Installation
2.1 Application Issues
InsulGard is a versatile device that can be applied to most medium voltage equipment.
Specifics of a particular application (optional components and planning installation)
should be taken into account when ordering.
Issues that should be considered are:
•
Type and specifics of equipment to monitor
•
Configuration of PD sensors
•
Noise aspects
•
Device location and environmental issues
•
What additional parameters to measure?
•
Networking and Communicating to the device
You may wish to use a short Manual “InsulGard Guide: How to Choose Proper
Installation Options”, CHPD, 2003. For sensor installation use corresponding CHPD
Installation Manuals.
2.1.1 Type and specifics of equipment to monitor
In general, InsulGard was designed to monitor partial discharges in medium voltage
rotating machines, switchgear, cast transformers and associated connections. The
connections may include cable terminations and portions of cable and portions of bus
feeding an object. InsulGard can be used for additional variations of medium voltage
and high voltage equipment, but application of the technology will require special pre-
engineering and adaptation. Consideration should be given while attempting to use
InsulGard on high voltage equipment above 120kV. External noise in the form of corona
discharges should be addressed in this case.
The nature of PD indicates it will not occur in the equipment 2300 Volts and below.
Marginally, 2300V equipment can be considered, but the technology is inconclusive. It
may or may not detect a significant problem at 2300V. Ratings 4160V and higher are
considered reliable for PD diagnostic applications. In general, higher voltage provides
greater destructive power of partial discharges and problems can be detected and
predicted.
2.1.2 Configuration of PD Sensors
Configuration of PD sensors is really application specific. There are some general
guidelines below. We recommend discussing any sensor installations with a Cutler-
Hammer application engineer.
