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I. Overview
The electrical integrity of earthing device is the electrical
connectivity among all kinds of electrical devices that should be
grounded or the electrical connectivity between ground equipment
all parts and devices, it is DC resistance value; it is also known as
electrical conductivity. Ground down lead and earth mat of electrical
equipment reliable and effective connection is the fundamental
guarantee of instrument safety operation. Ground down lead is the
connection part of electrical equipment and earth mat. In the
long-term running, the connection part may be rusty even ruptured
due to moisture and other factors, which will cause the resistance
increases which at connection point of ground down lead and the
main earth mat, and thus cannot meet the requirements of
electrical power regulations and standard. It also cause the
instrument hides danger in work, seriously even cause the
instrument run in lost ground status. Underground ground electrode
and its connection parts may rusty, and even ruptured. Therefore, it
is necessary to regularly do the electrical integrity test of grounding
devices.
Electric Power Industry Standard PRC-DL/T475-2006
“Earthing Device Characteristic Parameters Measurement Guide”
Summary of Contents for HTDT-10A
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