Power Systems Grounding by Md. Abdus Salam & Quazi M Rahman

Author:Md. Abdus Salam & Quazi M Rahman
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

4.2 Objectives of Grounding System

The objectives of any grounding system are as follows:

Reduce insulation level of power system equipment: Power system equipment like transformer’s neutral must be grounded. This can decrease the operating voltage and insulation level of the equipment.

Ensure personal safety: A good grounding system of a substation can ensure that the touch and step voltages meet the standard voltage levels.

Eliminate electrostatic accidents: Static electric current may create interference of electronic devices and generate fire near any flammable object. A good grounding system can release the static current to the earth which can prevent that type of incident.

Reduce electromagnetic interference: The normal operation of any electronic device is interrupted due to electromagnetic interference. This type of interference can be reduced by the good grounding system.

Reduce cathodic protection current : The voltage is usually induced in the pipeline at the same corridor of the transmission lines which can harm the utility operators. The cathodic protection is used in the pipeline to mitigate high touch potential and reduce the current due to a fault condition. Therefore, the cathodic protection system of the pipeline must be grounded to release the current into the earth.

Detecting ground faults: In the substation, there are many leakage breakers and other fault leakage protection devices used in the low voltage circuits. A high magnitude of the ground fault current is required to bring the protection device into action, if there is an earth fault in the circuit. Therefore, to meet this condition, the neutral point on the secondary side of the step-down transformer must be grounded.

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