I. Key Technical Parameters
When selecting and operating the insulation glove withstand voltage tester, the following core technical parameters need to be focused on to ensure compliance with the test and normal operation of the equipment.
1.1 Power Input
The device is powered by a 220-volt single-phase AC power supply, with a voltage fluctuation range of ±10% and a frequency of 50 Hz. A regular laboratory power supply can meet the usage conditions.
1.2 Rated Output Voltage
The rated output voltage is divided according to the withstand voltage level of the tested insulation tools. Common specifications include 30 kilovolts and 50 kilovolts, and some devices can reach 100 kilovolts. The corresponding test equipment of the voltage level of the tested insulation gloves and boots should be matched.
1.3 Rated Capacity
The rated capacity of the device is generally 3 kilovolts or 5 kilovolts. This parameter directly determines the equipment’s load-bearing capacity, affecting the number of test samples that can be tested simultaneously and the higher withstand voltage application level. The larger the capacity, the stronger the load-bearing performance.
1.4 Current and Voltage Measurement
Leakage current is the core indicator for determining insulation performance. The equipment’s leakage current measurement range is 0 to 29.9 milliamps, with a resolution of 0.01 milliamps. It can accurately capture the insulation state changes of the test sample in a high-voltage environment. The voltage and current measurement error is controlled within ±1% or ±2%, in line with the national standards for the accuracy of the test equipment.
1.5 Timing Parameters
The device’s timing range is 0 to 99 minutes, and the duration can be freely set, which can adapt to the requirements of various test procedures for the duration of the withstand voltage test.
II. Test Working Principle
This device operates based on the power frequency withstand voltage test principle. The device is equipped with a voltage regulator and a test transformer, which can gradually increase the input 220-volt AC voltage to the required test high voltage and apply it to the surface of the tested sample. In a high-voltage environment, the test sample will generate a weak leakage current. The equipment collects and detects the leakage current data of each path through a high-precision current sensor.
2.1 Insulation Gloves Testing Method
The test is conducted using the internal and external water electrode method. Equal-height water is injected inside and outside the gloves, with a dry edge of about 90 millimeters reserved above the water surface as the insulation isolation area. The high-voltage electrodes are placed in the internal water, and the external water tank is grounded for connection. This forms a complete test circuit.
2.2 Insulation Boots Testing Method
The test is conducted using the dry test method. Metal balls with a diameter not exceeding 4 millimeters are filled inside the boots, with a filling height of no less than 15 millimeters. The metal ball is connected to the high-voltage electrodes through a metal plate, and the boot bottom is attached to the grounding metal plate to build a complete test circuit.
III. Test Environment and Preparations
3.1 Test Environment Requirements
To ensure the accuracy of the test results and the safety of the test operation, the test environment must be strictly controlled: the environmental temperature should be maintained at -10 degrees Celsius to 40 degrees Celsius, and the relative humidity should not exceed 90%; the equipment must be reliably grounded, with a grounding resistance of less than 0.1 ohms.
3.2 Preparations for Test Samples
Before the test, the test samples need to be inspected and pre-treated. Insulation gloves should have no appearance defects such as damage, aging, or adhesion, and be cleaned and dried before filling with water; insulation boots should also have no appearance integrity issues, and metal balls should be filled according to the standard requirements. All test samples should be connected to the leakage current sampling lines by number for easy data recording and later traceability.
IV. Standard Operating Procedure
To ensure the effectiveness and safety of the test, it is necessary to strictly follow the standardized operating procedure.
4.1 Wiring Stage
Complete the connection of the high-voltage connection lines between the control console and the test water tank, test support, and grounding lines, as well as multi-core control signal lines, ensuring that the connections are firm and without looseness.
4.2 Test Sample Placement Stage
Place the pre-treated insulation gloves and insulation boots on the test stand smoothly, and connect the high-voltage electrodes and leakage current sampling lines according to the equipment markings; leave sufficient insulation spacing between the test samples to avoid mutual discharge and interference during the test.
4.3 Parameter Setting Stage In the console operation interface, accurately input the test voltage, the duration of withstand voltage, and the alarm threshold values for each leakage current path. Based on the voltage level of the test sample and in accordance with the requirements of the regulations, set the qualified determination criteria.
4.4 Start of the test phase
After starting the equipment, the instrument automatically raises the voltage to the set value and simultaneously activates the timing function. During the test, the operator should stay away from the high-voltage area and monitor the test status through the observation window or the monitoring equipment. If there is no breakdown discharge phenomenon and each leakage current remains below the standard limit, the test sample is determined to be qualified.
4.5 Test conclusion phase
After the timing ends, the equipment automatically lowers the voltage to zero. After the operator confirms that the high-voltage indicator light goes out and the voltage display returns to zero, they can enter the high-voltage area to remove the test sample, record the test data, and prepare the test report.
V. Qualified determination criteria
Insulating gloves and insulating boots are determined based on leakage current as the core criterion. Under the specified test voltage, the leakage current limit values for different specifications of test samples are different; during the withstand voltage test, the leakage current of the test sample needs to remain stable and not show a significant upward trend, and the maximum current value must not exceed the specified limit.
During the test, if any of the following situations occur, the test sample is determined to be不合格：
The leakage current exceeds the standard limit；
During the test， breakdown or flashover phenomena occur；
After the test， damage such as expansion， cracking， or carbonization appears on the surface of the test sample；
After the test， there is obvious overheating in a local area of the test sample.
Post time: May-18-2026