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Archive: Category «Metering»

Learn How To Specify Current Transformers

Current transformers are used to supply information to the protective relays and/or current, power and energy metering “instruments”. For this purpose they must supply a secondary current proportional to the… Read more

Dec 05, 2015 | Edvard

Learn How To Specify Current Transformers

Electrical Thumb Rules You MUST Follow (8)

Accuracy Class of Metering CT Accuracy Class Letter of CT Accuracy Class of Protection CT Continued from part 7: Electrical Thumb Rules You MUST Follow (Part 7) Metering Class CT… Read more

Mar 10, 2014 | jiguparmar

Power measurement in a three-phase system

Electrical power is measured with a wattmeter. A wattmeter consists of a current coil connected in series with load, while the other potential coil is connected parallel with load. Depending… Read more

Jan 19, 2013 | Edvard

Power Measurement In a Three-Phase System

Rogowski Coil Construction

Figure 1 shows the construction of a Rogowski coil, an air-core current transformer that is especially well suited to measuring ripple currents in the presence of a DC component or… Read more

Dec 13, 2012 | Edvard

Rogowski Coil Construction

HV Instrument Current Transformers in T&D

Electrical measurements on a high-voltage transmission and distribution systems cannot be made practically or safely with direct contact to the power carrying conductors. Instead, the voltages and currents must be… Read more

Nov 23, 2012 | Edvard

HV Instrument Current Transformers in Transmission and Distribution Systems

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