OVATION 1C31204G01 Thyristor module

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Perform tests by the two-point method according to IEEE 81, Guide for Measuring Earth Resistivity Grounding Impedance and Earth Surface Potentials of Ground Systems (1983). The two-point method provides a pass/fail indication of ground resistance and is easier to perform than the three-point method. Maximum grounding to resistance values are as follows. (a) Equipment rated 500 kVA and less: 10 ohms (b) Equipment rated 500 to 1000 kVA: 5 ohms (c) Equipment rated more than 1000 kVA: 3 ohms (d) Unfenced substations and pad-mounted equipment: 5 ohms (e) Manhole grounds: 10 ohms (3) Measure the ground path resistance of all branches of the grounding system from the point of connection, on the structure, equipment enclosure, or neutral conductor, to the earthing connection. The earthing connection may be the top of a single ground rod, a water pipe, a counterpoise, or a ground grid.

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