High-voltage switchgear

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High-voltage switchgear is any switchgear used to connect or disconnect a part of a high-voltage power system. This equipment is essential for the protection and safe operation, without interruption, of a high voltage power system, and is important because it is directly linked to the quality of the electricity supply.

The term "high voltage" covers the former medium voltage (MV) and the former high voltage (HV), so refers to equipment with a rated voltage of over 1000 V in the case of alternating current, and over 1500 V in the case of direct current. The industrial applications of high voltage circuit breakers are for the moment limited to alternating current because they are more economical, there are however high voltage disconnectors for direct current connections.

High-voltage switchgear was invented at the end of the 19th century for operating motors and others electric machines.^[1] The technology has been improved over time and can be used with voltages up to 1,100 kV.^[2]