Mar 2013
Electricity Distribution
Trip Timing Module
Mar 2013
Scottish and Southern Electricity Networks
SSEN Future Networks Team
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Innovation Funding Incentive
LV & 11kV Networks
Trip timing is an operating test technique used by a number of DNO’s to ensure that circuit breakers will respond appropriately within a sufficient time period if required. It typically requires field operatives to visit a substation and manually carry out a test trip and timing how long the asset takes to respond.

The introduction of the trip timing monitor would enable condition information to be gathered when circuit breakers are remotely operated. This is a monitoring system that can be installed semi-permanently or permanently. This allows measurement of trip timing over a period to accommodate the ability to switch different circuits on the switchboards; also permanently installed systems will gather condition information for non-planned circuit breaker operations.

The two most common causes of faults on High Voltage distribution switchgear are insulation failure and mechanical or mechanism problems. Recording the trip current profile has been established as a way of assessing the operation of the mechanism. This proposal aims to develop a compact trip timing module that can be used to permanently or semi-permanently monitor and automatically capture the trip profile of circuit breakers within substations every time they are called on to operate.