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توضیحات
IEEE Std 81TM-1983 [B36]a
was prepared by the Power System Instrumentation and Measurement
Committee of the IEEE Power and Energy Society. The guide was intended to cover the majority of field
measurements that did not require special, high-precision equipment and did not address unusual
difficulties that can occur in large grounding systems, abnormally high stray alternating currents (ac) or
direct currents (dc), and so on. In 1991, IEEE Std 81 was reaffirmed and IEEE Std 81.2-1991 [B37] was
released to cover the measurement of very low impedances (less than 1 ohm) along with specialized
instrumentation, measurement techniques, and safety considerations.
After nearly two decades of inactivity, the Substation Committee of the IEEE Power and Energy Society
determined that IEEE Std 81-1983 and IEEE Std 81.2-1991 contained subject matter that is very relevant
for applications in electric utility facilities, but the standards needed to be updated. A working group was
formed to combine both standards into a singular document that included updated instrumentation,
techniques, and information. This document represents the efforts of that working group.
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