safety warning

1. The operation and maintenance of the partial discharge detector should be carried out by competent professionals.

2. The test site voltage of the partial discharge detector is as high as tens of thousands of volts, and the test personnel should strictly abide by all safety precautions. There should be obvious and clear warning signs in the test area, and everyone on site should be aware of the high-voltage area. The measurement personnel who are directly engaged in the measurement should understand all live components and high-voltage components in the measurement loop, and those who are not directly engaged in the measurement should be isolated outside the test area. During the test and after power-on, no one is allowed to enter the high-voltage area.

3. Before the test, the operator should master the test circuit, test method, test procedure and test purpose.

4. The test site should be tidy and clean, and other irrelevant items should not be stored. There should be no messy small metal pieces (such as bare copper wire segments, screws, nuts, and other small metal pieces) on the ground in the high-voltage range. The tested product, step-up transformer, coupling capacitor, etc. should be kept at a proper distance from the surroundings.

5. The surface of the test product, step-up transformer, coupling capacitor, etc. should be kept dry and clean, because moisture and dirt on the surface will cause partial discharge on the surface and cause abnormal measurement.

6. The test operator connects the circuit according to the regulations. Various metal objects in the test area should be firmly grounded. Check and improve all possible discharge parts in the test area (if there are no sharp or acute angles). Pay special attention to whether the various ground wires are well grounded. .

7. Before the test starts to pressurize, the test personnel must check the circuit in detail and comprehensively to avoid wrong connection of the circuit. Particular attention should be paid to whether the wiring of the grounding wire, high-voltage wire and strong current loop is firmly connected.

8. When the test is abnormal, the power supply should be cut off before further processing.

Precautions

1. Before the test starts to pressurize, the test personnel must check the circuit in detail and comprehensively to avoid wrong connection of the circuit. Test whether the grounding wire of the instrument is firmly connected to the grounding body. If the connection is not firm or the wire is kicked off by the foot when the head is pinched during preparation, this may cause personal and equipment accidents.

2. For connecting wires, avoid exposing the pointed duan to prevent the pointed duan from corona discharge, especially for partial discharge tests with higher voltage levels. If necessary, thicken the high-voltage connecting wire and install an anti-corona cover to reduce the field strength. Corona discharge caused by too high. 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 instrument will inevitably exceed the full scale. To prevent damage to the instrument, the coarse gain adjustment knob of the instrument should be turned counterclockwise by one or more steps, and the standard is not to exceed the full scale. When the voltage drops to the measured voltage, turn the coarse gain adjustment switch clockwise by one or more gears to record the measured value.