The current transformer for measurement mainly cooperates with the measuring instrument, and is used to measure current, voltage, power, etc. under normal working conditions of the line. The main requirements for measuring miniature current transformers are: 1. Reliable insulation, 2. High enough measurement accuracy, 3. When the measured line fails, the transformer should be saturated within the appropriate range (such as 500% rated). Current) to protect the measuring instrument. The current transformer for protection current transformer protection mainly cooperates with the relay device, and provides a signal cut-off fault circuit to the relay device to protect the safety of the power supply system when a short-circuit overload occurs in the line. The working conditions of the miniature current transformer for protection are completely different from those of the measuring transformer. The protective transformer only starts to work effectively when it is several times larger than the normal current.
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