Which method can be used for testing a power station ground?

The shunt method is used for testing a power station ground because it involves measuring the voltage drop across a known resistance, or shunt, which allows for the calculation of the current flowing through the grounding system. This is particularly useful in power stations, where effective grounding is crucial for safety and system performance. By using the shunt method, technicians can assess the integrity of the grounding system and ensure that it is functioning correctly to prevent electrical faults and enhance system reliability.

The other methods, while they may have applications in other contexts, do not provide the same level of detail on resistance and grounding effectiveness in a high-power environment. Clamping, direct measurement, and inductive sensing are not typically used to assess the integrity of grounding systems in power stations, as they may focus more on current measurement or use sensing techniques that do not directly relate to grounding assessment.