Test methods and precautions for the withstand voltage of insulating boots and insulating gloves

Insulating boots and insulating gloves are important personal protective equipment in power operations, and their withstand voltage tests are a key link to ensure safety performance.
Test items and requirements
Insulation glove withstand voltage test
AC withstand voltage test
Voltage level: According to the glove category (0 to 4), the test voltage ranges from 5kV to 20kV (for example, Class 0 gloves are 5kV and Class 4 gloves are 20kV).
Duration: 1 minute (or 3 minutes, depending on the standard version).
Leakage current: ≤ 16mA (as required by GB/T 17622).
The criteria for judgment: no breakdown, no flashover, and no obvious heating.
The test voltage is 1.5 times the AC voltage, and the duration is 1 minute.
Insulation boot withstand voltage test
Power frequency withstand voltage test
Voltage level: Usually 15kV (low-voltage boots) or 25kV (high-voltage boots), with a duration of 1 minute.
Leakage current: ≤ 10mA (as required by GB 12011).
Judgment criteria: No breakdown, no local overheating.
Test method
Test equipment
Insulating boots and gloves withstand voltage test device: Outputs industrial frequency alternating voltage (50Hz), with an accuracy of ±3%.
Electrode device:
The inner electrode of the glove is filled with water, and the outer electrode is wound with metal foil or immersed in water.
Insulating boots: Fill with water (the water level is 5 cm from the top of the boot), and place the external electrode in a metal water container.
Leakage current detector: Connected in series in the high-voltage circuit.
Experimental Procedure
Pre-treatment: The specimens shall be placed in an environment of (23 ± 2)℃ and humidity of (50 ± 5)% for 24 hours before the test.
Wiring:
Fill the gloves / boots with water to the specified height to ensure good contact between the inner and outer electrodes.
The high-voltage terminal is connected to the outer electrode, and the ground terminal is connected to the inner electrode.
Ramp up: Increase at a rate of 1 kV/s to the specified voltage and hold for 1 minute.
Monitoring: Record the leakage current value and observe whether there is a breakdown or abnormal discharge.
Depressurization: After the test is completed, slowly reduce the pressure to zero and disconnect the power supply.
Notes to be observed
Safety distance: Operators must maintain a safe distance, and the test area should be fenced off.
Environmental conditions: Temperature 10~30℃, humidity ≤ 80%.
Repeat test: If the first test is not qualified, a retest can be conducted once (provided that no damage is confirmed).
Test period
New purchase acceptance: A withstand voltage test must be conducted.
Preventive tests:
Insulating gloves: Once every six months (as required by DL/T 976).
Insulating boots: every six months for high-voltage boots or once a year for low-voltage boots.
Abnormal conditions: If the product gets damp or damaged, it should be immediately discontinued and retested.