All measuring and monitoring elements which display/record the values or are used as signal transmitters. All of them have no primary influence on the electrical supply.
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By Philippe Mertens, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=6726709
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Instrument transformer
•Current transformer
•Voltage transformer
•Current and voltage transformer
•Split-core current transformer
Instrument transformers are used when the current or voltage is too high for direct measurement with commercially available instruments.
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