●If unreliable → false tripping or no protection → major system failure.
(2) Safety
●Provides electrical isolation between HV/HC circuits and measuring instruments.
●Prevents electric shock, fire hazards, and equipment damage.
●Protects operators and sensitive meters/relays.
●(3) Durability
●Made with high-quality insulation, epoxy/oil filling, robust cores.
●Withstand heat, voltage surges, mechanical vibration, and harsh weather.
●Long life with minimal maintenance, even in outdoor substations.
(4) Efficiency
●CT/PT consume very little power (low burden).
●Do not affect the efficiency of the main circuit.
●Enable efficient system monitoring and control without adding load.
(5) Accuracy
●Designed with specific accuracy classes (e.g., 0.2, 0.5, 1.0 for metering; 5P, 10P for protection).
●Accuracy is vital for:
☆Correct billing (energy meters).
☆Precise fault detection (relays). ☆Stable system operation.
●Inaccurate CT/PT → wrong bills, false relay operation, blackout risk.
✅ In Summary:
CT → steps down current.
PT → steps down voltage.
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