I. Necessity of Preventive Testing for Electrical Safety Tools
Preventive testing of electrical safety tools is a critical component of the power industry’s safety management system. According to DL/T 1476-2023, “Regulations for Preventive Testing of Electrical Safety Tools,” auxiliary insulating equipment such as insulated boots and insulated gloves must undergo regular power-frequency withstand voltage tests to verify their insulation reliability under working voltage conditions.
Over prolonged use, these insulating tools are prone to performance degradation due to moisture absorption, material aging, or mechanical damage from external forces. If not rigorously tested before being deployed in field operations, they pose significant electric shock hazards to frontline workers. Therefore, standardized testing using professional equipment is essential to safeguard personnel safety and ensure stable, reliable grid operation.
II. Core Technical Features of the Test Equipment
The fully automatic insulated boot (glove) withstand voltage test device is specifically designed for batch testing of insulated boots and gloves. It overcomes the limitations of traditional methods—such as complex procedures, low efficiency, and heavy reliance on manual operation—offering multiple core technical advantages:
(1) Fully Automated Operation Enhances Efficiency and Compliance
Equipped with an automated voltage control system, the device automatically performs closing operations upon startup, steadily increasing voltage at prescribed rates. Once the preset test voltage is reached, it automatically begins timing and stabilizing the voltage. After completion, it automatically reduces voltage to zero and cuts off power—entirely without manual intervention.
This automation significantly reduces individual test duration and eliminates human-induced errors that could distort test data, ensuring every test strictly complies with procedural standards.
(2) Multiple Independent Test Channels Enable Accurate Identification of Defective Items
The device can simultaneously test up to six pairs of insulated boots or gloves per cycle, with optional expansion to eight channels. Each test specimen has its own dedicated leakage current monitoring channel, and real-time data is displayed on a high-definition touch screen. Operators can instantly view leakage current values for each item, enabling rapid and precise identification of defective products with insulation flaws.
(3) Dual Dry and Wet Testing Modes Cater to Different Equipment Requirements
Considering structural differences between insulated boots and gloves, the device offers two standardized testing modes:
For insulated boots, a dry steel-ball method is used: small steel balls (no more than 4 mm in diameter) are placed inside the boot to serve as internal electrodes, replacing the traditional water-filling method. This eliminates post-test water retention issues and improves testing throughput.
For insulated gloves, a wet water-filling method is applied: water with specified resistivity is injected into the glove, which is then submerged in a water tank. The outer exposed portion of the glove’s opening is dried to form a complete test circuit, meeting regulatory requirements for glove withstand voltage testing.
(4) Multi-level Safety Protection Ensures Robust Test Security
The device incorporates multiple layers of safety protection, covering overvoltage and overcurrent at input and high-voltage ends, as well as high-voltage flashover trip functions. These features respond quickly and trigger accurately, providing comprehensive protection for both the equipment and operators.
Certain models include independent high-voltage isolation units for each channel. When a single test specimen experiences breakdown or excessive leakage current, the faulty branch automatically disconnects from the high-voltage circuit, allowing remaining intact specimens to continue testing. This enhances overall safety, prevents single-point failures from halting entire test batches, and minimizes efficiency loss.
(5) Flexible Mobility and Comprehensive Data Management
The entire system is integrated into a mobile test vehicle equipped with casters for easy transportation across different work sites. The device is equipped with a high-speed mini printing module that can instantly generate printed test reports on-site, meeting management requirements for document retention and archiving. Some models feature reserved data communication interfaces, enabling integration with upper-level management terminals to achieve remote control, centralized data collection, and systematic archiving, thus adapting to the industry’s digital management upgrade needs.
III. Application Value and Practical Significance in the Industry
The widespread adoption of this dielectric withstand testing equipment provides solid technical support for standardized and refined management of safety tools in the power sector. First, its fully automatic, standardized closed-loop testing process ensures consistent execution standards, guaranteeing objectivity and traceability of test results, thereby enhancing the scientific accuracy of insulation tool performance evaluation. Second, the multi-channel synchronous testing mode combined with dry-type testing technology for insulating boots effectively reduces overall testing time, minimizes labor input, and improves the overall efficiency of safety tool inspection operations.
According to current regulations, insulating boots and gloves require routine testing every six months. This testing device has been specifically designed and developed in full compliance with national standards such as DL/T 1476 and GB/T 17622. After extensive field application validation, it demonstrates high precision in measurement data and reliable safety protection, meeting all industry requirements for technical performance.
Post time: Aug-17-2026