Note on partial discharge detection test:

1. Before the test starts to pressurize, the tester must check the wiring in detail and comprehensively to avoid wrong wiring. Whether the grounding wire of the test instrument is firmly connected to the grounding body, if the connection is not firm or pinch the head when preparing to work The tail line is kicked and broken, which may cause personal and equipment accidents.

2. For connecting wires, avoid exposing the tip to prevent corona discharge at the tip, especially for partial discharge tests with higher voltage levels. If necessary, thicken the high-voltage connection line and install an anti-corona cover to reduce the corona discharge caused by excessive field strength. The shielding cover should not be in contact with the porcelain skirt of the test product.

3. Under normal circumstances, during the test, the partial discharge of the test product during the withstand voltage and pre-boost is much larger than the normal value. At this time, the gauge of the instrument will inevitably exceed the full scale to prevent damage to the instrument. The coarse gain adjustment knob of the instrument should be rotated counterclockwise by one or more steps, so as not to exceed the full scale as the standard. When the voltage drops to the measurement voltage, turn the coarse gain adjustment switch clockwise for one or more gears. In order to record the measured value.