The preventive test device for insulating gloves is mainly composed of a power frequency test transformer, an intelligent test control console, and a dedicated test water tank. It can conduct insulation withstand voltage tests for multiple pairs of gloves simultaneously. It adopts fully automatic voltage rise (fall), automatically reads the leakage current of each tested item, and the entire process is fully automated, with the test data automatically printed.
It can conduct 6 or 8 pairs of insulating boots or 6 or 8 pairs of insulating gloves withstand voltage tests at one time, and can simultaneously display the leakage current of insulating boots or insulating gloves. The control console is equipped with overcurrent protection, zero position protection, time protection and alarm functions. The insulating boot and glove preventive test device is developed and produced based on the test procedures for insulating boots (gloves) and in accordance with the opinions of the majority of users. The intelligent and automated test effectively solves the irregular testing methods in the past, simplifying the testing procedures and improving the testing speed. It can more reliably identify the leakage current, withstand voltage and other parameters of insulating boots (gloves), ensuring the safety of the test workers, and is an ideal preventive test equipment for insulating boots (gloves).
Working principle:
Connect to a 0-220V power supply, adjust the power frequency withstand voltage test unit, according to the electromagnetic induction principle of the test transformer, make the transformer generate 0-30KV power frequency high voltage to each electrode, so that the insulating boots (gloves) obtain the specified test voltage. Then, according to the test procedures for insulating boots (gloves), read and record the test parameters.
Test specifications requirements:
The test should be carried out in a specially designed dedicated water tank. During the test, the water tank is filled with water and is insulated from the ground. If the water tank is a metal material product, the ground wire can be connected to the water tank wall and a AC milliampere meter can be connected in series for grounding. Put the insulating gloves and insulating boots filled with water in the water tank.
The water surface inside the insulating cover, insulating gloves and insulating boots should be lower than the end of these insulating tools by a certain distance. If the water surface inside the insulating gloves cannot be higher than 5cm below the glove opening, and the water surface inside the insulating boots cannot be higher than 5cm below the end face of the insulating boots, and it is required that the exposed parts remain dry and clean to prevent surface discharge along the end when applying pressure.
During the withstand voltage test, if the insulating cover, insulating gloves or insulating boots are broken down, the current swings abnormally or the leakage current exceeds the standard shown in the test specification table, that is, the leakage current of the high-voltage insulating gloves exceeds 9mA, the low-voltage insulating gloves exceeds 2.5mA, the high-voltage rubber insulating boots exceeds 7.5mA, it should be regarded as unqualified and prohibited from being used as insulating safety tools.
The withstand voltage time of the insulating cover is 5 minutes. The test cycle is once a year, while the withstand voltage time of insulating gloves and insulating boots is 1 minute, and the test cycle is once every 6 months.
Test steps:
1. Add two-thirds of water to the water tank and fix it.
2. Put the insulated boots and insulated gloves with water into the water tank. Use the insulation clips on the probe rod to hold the insulated gloves, and keep the upper parts of the insulated boots and gloves dry.
3. Adjust the tension screw on the high-pressure pipe, insert the probe rod into the water inside the insulated boots and gloves, and tighten the tension screw to fix the probe rod.
4. Connect the water tank box terminals to ground, connect the water tank box socket to the output socket of the control box, and turn each milliampere meter switch on the water tank box to the “off” position.
5. Connect the control box power socket to a 220V power source, and ground the grounding terminal.
6. Set the test time and overcurrent protection value.
7. Before powering on, return the voltage regulator to zero, close the switch, the button light goes off, if an alarm is needed, press the alarm switch, the alarm device emits sound and light alarm. Press the start button, the start button light goes on, and at the same time the alarm stops indicating that the power is on and waiting for voltage increase.
8. Rotate the voltage regulator handle clockwise at a constant speed to increase the voltage, and closely monitor the conditions of the control box instruments and the milliampere meters of the water tank box.
9. If the milliampere meter of the water tank box has an abnormality, turn the milliampere meter switch corresponding to the abnormal milliampere meter to the “on” position to protect the milliampere meter from being damaged by overcurrent.
10. When reaching the required voltage, open the time relay switch, start timing.
11. When the time relay reaches the set time, the alarm device rings again to remind that the withstand voltage time is up.
12. Rotate the voltage regulator handle counterclockwise to reduce the voltage, then turn off the time relay switch and press the disconnect button, pull down the switch, and the test is completed.
13. Unless the test is permitted, never allow the full power to suddenly be cut off.
14. If the test specimen shorts out or breaks down during the test, the overcurrent limiter will act to cut off the high-voltage output.
Post time: Aug-25-2026