Switchgear
Contact resistance limits for HV circuit breakers
The manufacturer's limit is the first reference, but comparing each pole with the others and with previous results tells you more than a single pass/fail value.
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Cable fault location in three steps: analyse, prelocate, pinpoint
A field workflow for finding power cable faults quickly: classify the fault, choose the right prelocation method, then confirm the exact spot before anyone digs.
Locating cable sheath faults with a high-voltage Murray bridge
Why outer sheath faults on HV cables are hard to find with pulse methods, how the Murray loop works, and the site details that decide its accuracy.
Secondary injection testing of protection relays: a commissioning checklist
What to prepare, what to test and what to record when you commission overcurrent, distance and differential protection with a relay test set.