Different Types of Voltage Level:

Rated Voltage

Nominal Voltage

Extra low Voltage

Low Voltage

Medium voltage

High Voltage

Extra High Voltage

Rated Voltage:

The maximum standard voltage that can be produced by a generating station is called rated voltage under safety margin. The rated voltage is typically said to be a generator’s maximum voltage.

Nominal Voltage:

The predermined system voltage is called nominal voltage. i.e an alternator has designed to produce 11kV + or – 5% but it produces 11. 1 kV means the nominal voltage of the alternator is 11kV and The rated voltage is 11.1kV. We cannot accurately maintain the alternator to operate in nominal voltage.

The Voltage level of below 70Volts is called Extra low voltage. The human can touch the line and it does not harm.

Example: Electronics instrument axillary supply

Medium Voltage

ANSI/IEEE 1585-2002 refers to: Medium Voltage (0.6kV – 33 kV) and IEEE Std 1623-2004 refers to: Devices rated to medium voltage (1 kV-33 kV). [It is assumed that this is ac.]

Note: The different manufactures have different voltage standards.

Example: Rural power transmission lines, Industrial power distribution

High Voltage:

The voltage level between 33kV to 220 kV is called High Voltage. Also the transmission line carries the high voltages is called high voltage transmission lines.

Example: heavy transmission towers

The extra high voltages will be added as per the consumer requirement. Typically, the voltage level between the 220kV to 760 kV is called Extra High voltages.

Ultra High voltage:

The ultra-high voltage lines are nothing but a voltage level above 800kV is called Ultra high voltage.

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