I. Explanation of the Necessity of Insulation Gloves Testing
Insulation gloves are important protective equipment for safeguarding the personal safety of operators in power operations. The stability of their insulation performance directly determines whether potential safety hazards in scenarios such as live operation and electrical equipment maintenance can be effectively controlled. The main body of the gloves is made of rubber. After long-term use or storage, they are prone to aging, cracking, absorbing water and getting damp, which in turn leads to a decline in insulation performance. Therefore, periodic inspection tests need to be conducted to identify potential failure hazards. The withstand voltage testing equipment is the core carrier for conducting preventive tests on insulation gloves. The technical performance of the equipment itself and the standardized operation procedures are the key points to ensure the authenticity and reliability of the test data and to avoid safety hazards in the testing process.
II. Overall Framework of Execution Standards and Regulations
The withstand voltage testing of insulation gloves is based on multiple-level regulatory documents to form a complete technical execution system. Different documents define the requirements for the product itself and the periodic detection requirements for later stages:
Product manufacturing and inspection national standard: GB/T 17622 “Insulating Gloves for Live Working”, which defines the classification of insulating gloves, various technical indicators, and basic test operation methods;
Preventive testing industry regulation: DL/T 1476 “Preventive Testing Procedures for Electrical Safety Tools” is the direct execution basis for periodic re-inspection of insulation gloves in the current industry, and this document has initiated the process of converting to national standards. The corresponding national standard “Preventive Testing Methods for Electrical Safety Tools” is still in the compilation stage;
Supplementary regulations: DL/T 976 “Preventive Testing Procedures for Live Working Tools, Devices and Equipment” also includes detection constraints for insulating gloves.
All these regulations uniformly clarify the items to be tested for insulation gloves, the interval for repeated testing, the voltage value applied during the test, the upper limit of allowable leakage current, and the complete test operation steps. They are the legal technical basis for the development, production, and on-site operation of withstand voltage testing equipment.
III. Core Parameters and Qualification Criteria of Insulation Gloves Withstand Voltage Testing
(1) Classification of Insulation Gloves Grades
According to the content of GB/T 17622, insulation gloves are classified by their withstand voltage capacity, and each grade corresponds to a higher applicable voltage and test voltage standard. Determining the nominal grade of the gloves is the prerequisite for setting the entire set of test parameters.
Hard requirements for qualification: During the test, the tested gloves must not exhibit breakdown or surface flashover, and the measured leakage current value must not exceed the limit standard for the corresponding grade.
(2) Test Cycle Requirements
The regular preventive testing cycle for in-use insulation gloves is 6 months;
Newly purchased insulation gloves must be tested before being put into use, and the result must be qualified before they can be used.
IV. Structural and Technical Performance Requirements of Withstand Voltage Testing Equipment
(1) Basic Composition of the Equipment
The complete insulation glove (insulating boot) withstand voltage testing device mainly consists of three modules: the test transformer as the high-voltage output unit, the control box as the human-machine operation control unit, and the test placement support with a water tank structure. The support is equipped with a stainless steel container for storing the tested equipment and conductive liquid.
(2) Core Technical Characteristics of the Intelligent Testing Equipment
The new generation of intelligent testing equipment developed in accordance with DL/T 1476 and other regulations has multiple optimized performance features:
Improved efficiency of simultaneous testing of multiple gloves or boots: It can conduct tests on 6 or 8 insulating gloves or boots simultaneously, and can separately collect the leakage current of each piece of equipment, accurately identify the non-conforming items, and significantly improve the efficiency of batch testing;
Independent protection and deactivation of a single circuit: If any sample exhibits breakdown or current exceeds the limit, the corresponding circuit will automatically cut off the high-voltage power supply, and the other samples will not be interfered with, without the need for repeated testing of the entire batch. High and low voltage physical safety isolation: The leakage current data is transmitted back to the control system through anti-interference wireless transmission, achieving a complete separation between the high-voltage test area and the low-voltage operation area, providing comprehensive safety protection for the test personnel;
Full-process automated operation: The stepping motor drives the voltage regulating device to rise the voltage at a uniform speed according to the prescribed rate, reaching the set voltage and automatically timing for stable voltage after reaching the set voltage, automatically reducing the voltage and cutting off the power supply upon the end of the test, and retaining the detection records. This significantly reduces the errors caused by manual operation;
Expansion function of dry-type insulation boot detection: Some equipment uses steel ball electrodes instead of the traditional water injection test method to solve the problem that the internal padding of the insulation boot is difficult to be completely dried after the water injection test and is damaged due to long-term moisture.
V. Standard test operation steps for industrial frequency withstand voltage of insulating gloves
According to the DL/T 1476 procedure, perform the industrial frequency withstand voltage test. The complete operation process is as follows:
Preparation before the test item: Pour water with resistivity ≤ 100Ω・m into the insulating glove, and then immerse the glove in a metal container filled with the same conductive water body to ensure that the liquid levels inside and outside the glove are the same; Reserve about 90mm of the upper opening of the glove exposed above the water surface, and wipe and dry the exposed part;
Electrode connection method: The water in the glove acts as the high-voltage input electrode, and the external metal container serves as the grounding electrode;
Voltage rise and stable voltage observation: Rise the voltage at a stable rate to the specified test voltage, maintain stable voltage for 1 minute, and observe throughout whether there are breakdown or flashover abnormalities, and simultaneously record the measured value of the leakage current;
Final result determination: If no breakdown or flashover occurs and the leakage current is within the limit, the insulating glove withstand voltage test can be determined as qualified.
Post time: Aug-14-2026