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A potential transformer steps the high voltage down to a level of 120 V to measure them safely and easily.
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∙ 14y ago
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A fuse or a circuit breaker can be added directly after the power source (and possibly a transformer) to do this.
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Why do you not use potential transformer?
Your question is rather oddly phrased as, obviously, there are countless ways in which you wouldn't use a potential transformer! It's much easier to explain why you would us a potential transformer. A potential transformer (known outside North America as a 'voltage transformer') is classified as an instrument transformer, which means that its output is used to drive instruments, such as voltmeters and (the voltage coils of) wattmeters, etc., or to provide inputs to protective relays. It's function is twofold: (1) to reduce the high voltage of the circuit to which its primary winding is connected to a lower voltage which can be 'read' by a voltmeter, etc., and (2) to electrically-isolate its secondary circuit from the primary circuit for the purpose of safety.
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A fuse or a circuit breaker can be added directly after the power source (and possibly a transformer) to do this.
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