In insulation testing, what mode should the test set be placed in to test from the high voltage side?

In insulation testing, selecting the appropriate mode for testing is crucial, especially when performing tests from the high voltage side. The mode labeled GSTg-RB is specifically designed for high voltage testing scenarios. This mode allows the test equipment to accurately apply a high voltage to the insulation and monitor its performance under these conditions.

Insulation testing from the high voltage side is important because it ensures that the insulation can handle the operational voltages and conditions it will experience in normal service. This not only tests the integrity of the insulation but also helps identify any potential weaknesses that could lead to failures or safety hazards.

In contrast, the other modes such as High-Voltage, Low-Voltage, and Grounded serve different purposes. High-Voltage generally indicates that the test set can apply high voltage, but it may not have the specific configurations or parameters in place that are tailored for high voltage insulation testing as required in this case. Low-Voltage is used for testing at lower stress levels, which would not be applicable for high voltage evaluations. Grounded pertains to configurations where the test system is connected to ground, which doesn’t apply in situations where insulation resistance is being evaluated from the high voltage side, as it may produce erroneous readings or affect the validity of the test results.