Campbell-scientific CS11-L Current Transformer User Manual download pdf (Page 29)

Appendix A. Theory of Operation

A.1 Typical Electrical Circuit

An example of a typical electrical circuit is a generator that provides energy in

the form of a 60 Hz sine wave. The energy is carried from the point of

generation to the point of consumption via two wires. The generator creates an

electrical load that lights up the light bulb (see FIGURE A-1).

FIGURE A-1. Generator schematic

To determine the consumption (amps) of the load, a way is needed to measure

what is passing through the wires.

A sensor is added to the circuit to measure the amperage going through the

circuit (see FIGURE A-2 through FIGURE A-4). This sensor is called a CT or

Current Transformer. The CS11-L is a current transformer.

CR1000

Datalogger

mV burst

Then

Calculate RMS

FIGURE A-2. Schematic of generator with current transformer

A-1

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Campbell-scientific CS11-L Current Transformer User Manual Page 29