I. Test Execution Standards
The insulation glove tests are strictly conducted in accordance with the current standards, and the core standards are as follows:
GB/T 17622-2008 “Insulating Gloves for Live Working”: Clearly defines product classification, technical requirements, and type test methods.
DL/T 1476-2025 “Preventive Test Procedures for Safety Tools in Electric Power”: Defines the implementation norms and specific requirements for preventive tests.
II. Key Test Parameters for 35kV Insulating Gloves
(1) Test Period
According to relevant regulations, the preventive test period for insulating gloves is once every six months.
(2) Test Preparation
During the test, inject water with resistivity not exceeding 100Ω·m (such as tap water) into the glove under test. Immerse the glove in a metal container filled with the same amount of water, making the water levels inside and outside the glove level. The part of the glove opening approximately 90mm should be dried to prevent surface discharge.
(3) Core Test Parameters
Preventive Test: Applicable to high-voltage (including 35kV level) gloves, with a power frequency withstand voltage of 8kV, a duration of 1 minute, and an allowable leakage current \\≤9mA\\.
Type / Factory Test: Applicable to Class 3 gloves, with a power frequency withstand voltage of 35kV, and the duration is carried out in accordance with the specified regulations.
(4) Important Note
The preventive test voltage is 8kV, not the glove verification voltage of 35kV. The 35kV verification test is only conducted during factory or type inspection, to prove the insulation margin, and the daily preventive tests are uniformly based on 8kV as the standard.
III. Insulating Boot (Glove) Voltage Withstand Test Equipment
(1) Core Equipment Composition
1. Fully Automatic Voltage Withstand Test Console
Integrated with microelectronic processing technology, equipped with a full Chinese LCD interface, capable of presetting the target voltage, test time, and leakage current protection value. The test process automatically increases voltage, counts time, and reduces voltage, without the need for manual intervention.
Input: AC 220V/50Hz
Output: AC 0~50kV
Capacity: Not less than 5kVA
2. High Voltage Test Transformer
Based on the principle of electromagnetic induction, it generates high voltage to provide the specified power frequency alternating current test voltage for the under-test gloves.
3. Insulating Boot Test Vehicle (Water Tank System)
Composed of a mobile support frame, water tank, electrode rod support, etc. Usually, there are 6 stations, capable of testing 1 to 6 gloves simultaneously, solving the problem of low efficiency in individual tests. The vehicle body is equipped with casters for easy on-site movement.
4. Leakage Current Detection System
Each test station is independently connected in series with an ammeter to display and print the voltage value and leakage current value of each tested item, accurately determining the unqualified individual, with an accuracy of \\±2%\\.
(2) Equipment Function Features
Overcurrent / Overvoltage Protection: Can set the leakage current upper limit (0~20mA), and automatically cut off the high voltage and give an alarm when the limit is exceeded.
Multi-channel Independent Detection: Displays and prints the voltage value and leakage current value of each glove simultaneously.
Data Management: Equipped with data storage and printing functions, capable of generating test reports for archiving.
Customizable Parameters: Supports target voltage (0\50kV), time (0\120s), and overcurrent value for flexible setting.
IV. Typical Application Scenarios and Operation Procedures
(1) Substation / Distribution Room – Regular Preventive Tests (Half-Year Inspection)
1. Applicable Objects
Power operation teams, safety tool room.
2. Environmental Conditions
Temperature 10~30℃, humidity ≤80%.
3. Operation Procedures
Visual Inspection: Check the surface of the glove for smoothness, any damage, cracks, pinholes, aging and hardening, moldiness, etc. Gloves with penetrating damage or severe aging are directly determined as unqualified and not subjected to voltage withstand tests. Water injection installation: Inject tap water (with resistivity ≤ 100Ω·m) into the glove interior, immerse it in a metal water tank filled with water, adjust the water levels to be level with each other, and ensure that about 90mm of the glove opening is exposed and dry.
Parameter setting: On the control console touch screen, select the “Insulating Gloves” mode, set the test voltage to 8kV, the upper limit of leakage current to 9mA, and the withstand voltage time to 60s.
Automatic voltage rise test: Start the “Automatic Voltage Rise”, the equipment rises the voltage at a constant rate to 8kV and automatically starts timing. Real-time monitor the leakage current of each path.
Result determination and recording: After the test is completed, the system automatically determines whether it is qualified or not. If there is no breakdown, no flashover, and the leakage current is ≤ 9mA, it is considered qualified. The data is automatically saved and a report is printed.
(II) Live Work Site – Rapid Sampling / Re-test
1. Applicable objects
Emergency repair teams, live work teams.
2. Scene characteristics
Before the operation, conduct rapid re-testing to verify whether the performance of the gloves after transportation and storage is intact. A portable insulating glove withstand test device can be used (some models have a higher voltage of 30kV). Use manual voltage rise, read the leakage current value one by one, and quickly determine whether it is qualified or not.
3. Special requirements
In humid environments or when the gloves are damp or soaked, stop using immediately and send for inspection.
Post time: Jul-20-2026