Published on Jun 05, 2023
With the development of modern power system to the direction of extra-high voltage, large capacity, far distance transmission and application of advanced technologies the demand on the safety, stability and economic operation of power system became higher.
A good grounding system is the fundamental insurance to keep the safe operation of the power system. The good grounding system should ensure the following:
¨ To provide safety to personnel during normal and fault conditions by limiting step and touch potential.
¨ To assure correct operation of electrical devices.
¨ To prevent damage to electrical apparatus.
¨ To dissipate lightning strokes.
¨ To stabilize voltage during transient conditions and therefore to minimize the probability of flashover during the transients
As it is stated in the ANSI/IEEE Standard 80-1986 "IEEE Guide for Safety in AC substation grounding," a safe grounding design has two objectives:
¨ To provide means to carry electric currents into the earth under normal and fault condition without exceeding any operational and equipment limit or adversely affecting continuity of service.
¨ To assure that a person in the vicinity of grounded facilities is not exposed to the danger of critical electrical shock.
