Briefly describe the meaning of four kinds of voltage monitoring: A, B, C and D? & lt electric power >

Class A: 10(6)kV bus voltage of substation and power plant with regional power supply load.

Class B: User terminal voltage for 35(66)KV dedicated line power supply and 1 10KV or above.

Class C: The terminal voltage of users supplied by 35(66)KV non-dedicated lines and 10(6)KV, with at least one voltage quality detection point per 10MW load.

Class d: 380/220V low-voltage network and user terminal voltage.

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