## CCSN Power: domestic voltage class division, voltage list of countries around the world

1. Classification of domestic voltage levels

Division of voltage levels (domestic): low voltage, high voltage, extra high voltage, ultra high voltage, high voltage direct current, ultra high voltage direct current

Low voltage (domestic): the AC voltage is a voltage level with an effective value of 1KV and below

High voltage (domestic): The AC voltage is a voltage level with an effective value of 1KV and above and below 330kV

Ultra-high voltage (domestic): the AC voltage is a voltage level with an effective value of 330kv and above and below 1000kV

UHV (domestic): the AC voltage is a voltage level with an effective value of 1000kv and above

High-voltage direct current (domestic): The direct current voltage is a voltage level below the effective value of ±800kV

High-voltage DC (domestic): the DC voltage is a voltage level above the effective value of ±800kV

Medium voltage: voltage level from 1kv to 20kv.

Electrical equipment that can withstand this voltage level is called medium voltage electrical equipment. Above medium pressure, there are high pressure, ultra high pressure, ultra high pressure and other levels.

2. International Voltage Classification

Division of voltage levels (international): high voltage, extra high voltage, ultra high voltage, high voltage direct current, ultra high voltage direct current

High-voltage HVAC (international): the AC voltage is a voltage level with an effective value of 35KV and above and below 220KV

Ultra-high voltage EHVAC (international): the AC voltage is 330KV effective value and above 1000KV voltage level

Ultra-high voltage UHVAC (international): the alternating current is a voltage level with an effective value of 1000KV and above

High-voltage direct current HVDC (international): The direct current voltage is the voltage level of ±600kv and below the effective value

UHVDC direct UHVDC (international): the DC voltage is a voltage level above the effective value of ±600KV

Remarks: The effective value is to pass the DC current and the AC current respectively on the same resistance, and after one AC cycle, if the electric energy consumed by them on the resistance is equal, the magnitude of the DC current (voltage) is regarded as the AC current The effective value of (voltage), the effective value of sinusoidal current (voltage) is equal to 1/√2 of its maximum value (amplitude), about 0.707 times.

Voltage list of countries around the world

Source: Global Electrical Resources

Posted by: Zhang Jianlong

Reviewed and translated by: Kailon Chung

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