Automatic overvoltage limitation

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 3. Protection and automation

Automation and telemechanics. Automatic overvoltage limitation

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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3.3.86. In order to limit the duration of exposure to increased voltage on high-voltage equipment of power lines, power plants and substations caused by unilateral disconnection of phases of the lines, automatic devices should be used that operate when the voltage increases above 110-130% of the rated voltage, if necessary, with control of the value and direction of reactive power along the lines power transmission

These devices must operate with a time delay that takes into account the permissible duration of overvoltages and is adjusted from the duration of switching and atmospheric overvoltages and swings, primarily for switching on shunt reactors (if there are any at the power plant or substation where the voltage increase is recorded). If the power plant or substation does not have shunt reactors with switches, or turning on the reactors does not lead to the required voltage reduction, the devices must act to disconnect the line that caused the voltage increase.

See other articles Section Rules for the installation of electrical installations (PUE).

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