Effects of deteriorated and contaminated substation surface covering layers on foot resistance calculations

Journal Article · Fri Jan 01 00:00:00 EST 1993 · IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/61.180325· OSTI ID:6410935

Dawalibi, F P; Xiong, W; Ma, J ^[1]

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1. Safe Engineering Services and Technologies Ltd., Montreal, Quebec (Canada)

ANSI/IEEE Standard 80 is widely used to determine electrical currents flowing through the human body as the result of touch and step voltages near transmission and distribution facilities. This paper shows, however, that significant inaccuracies can occur when the ANSI/IEEE Standard 80 proposed method to calculate foot resistances is applied in substations covered by a thin layer of crushed rock or similar covering layers. In particular, it is shown that the errors obtained by using the infinite series expression of the foot resistance are consistently larger than those produced by the simplified expression for clean and contaminated surface layers. This paper also compares its results with those proposed recently in the literature. It is shown that these recent proposed equations may be subject to major errors under certain conditions. Equivalent Thevenin foot resistances are plotted for various scenarios of clean and contaminated surface covering layers.

• OSTI ID: 6410935
• Journal Information: IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States), Vol. 8:1; ISSN 0885-8977
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
POWER SUBSTATIONS
SAFETY ENGINEERING
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL FAULTS
ELECTRICAL INSULATION
FEET
BODY
BODY AREAS
CURRENTS
ELECTRICAL PROPERTIES
ENGINEERING
LEGS
LIMBS
PHYSICAL PROPERTIES
240400* - Power Transmission & Distribution- Health & Safety- (1990-)