Loading study handbook…
Instrument transformers & metering, insulation & ground testing.
4 concepts
How CTs and VTs scale primary quantities for meters and relays: ratio math, polarity marks, burden, accuracy classes, saturation, and the open-CT hazard.
Unlocks with an access pass — one-time payment, no auto-renew. View passes
Blondel's theorem, the 1-, 2-, and 3-wattmeter methods, two-wattmeter math and sign rules below 0.5 PF, and kWh/demand metering with CT/VT multipliers.
Unlocks with an access pass — one-time payment, no auto-renew. View passes
Pick DC test voltages, correct IR for temperature, judge PI and DAR against IEEE 43 limits, and know when DC/AC hipot and tan-delta testing apply.
Unlocks with an access pass — one-time payment, no auto-renew. View passes
Measure soil resistivity with the Wenner four-pin method and electrode resistance with fall-of-potential (61.8% rule), three-point and clamp-on tests.
Unlocks with an access pass — one-time payment, no auto-renew. View passes