I. Core Components of the Device
A complete insulation boot withstand test device is an integrated system. The core components include the following:
1. High-voltage power unit
Function: Generate the high voltage required for the test (up to several tens of kilovolts is possible).
Core: Test transformer, with a capacity typically ranging from 3kVA to 5kVA.
Features: Equipped with an overcurrent protection device. In case of breakdown of the tested item, it can automatically and quickly cut off the power supply.
2. Voltage regulation and control unit
Function: Smoothly and continuously adjust the voltage applied to the primary side of the test transformer, and precisely control the output high voltage. Type:
Traditional manual pressure regulators: such as autotransformer regulators, have low cost, require manual operation, and have low automation level;
Electric regulators: driven by motors, allowing remote control of voltage increase / decrease;
Fully automatic programmable regulators: the modern mainstream type, controlled by microcomputers or PLCs, automatically completing the entire test process according to preset programs.
3. Measurement and Display Unit
Function: Real-time monitoring and display of key test parameters.
Key parameters:
High voltage (kV): sampled through high-voltage divider or high-voltage measurement winding, displayed more precisely on the control panel;
Leakage current (mA): connected in series with an ammeter in the test circuit, is the core indicator for determining whether the insulating boots are qualified;
Test time: supports automatic timing.
4. Test Chamber (Electrode System)
Function: Secure and reliably installs the tested insulating boots, forming the required electrical circuit for testing.
Structure:
External electrodes (chamber): metal water tank or stainless steel tank, serving as the grounding electrode, containing conductive solution (usually salt water or tap water, with an appropriate amount of salt added to adjust the conductivity);
Internal electrodes: metal plate electrodes or adjustable metal foot molds placed inside the boots, serving as high-voltage electrodes, requiring good contact with the inner wall of the boots, usually injecting conductive solution inside the boots to ensure contact effect.
Key requirements: The boot opening of the insulating boots should be higher than the external liquid surface by a certain distance (in accordance with standard regulations) to prevent surface flashover.
5. Safety Protection Unit
Function: Ensures the safety of the test personnel.
Measures:
High-voltage chamber door / protective cover: with access interlock switch, automatically cuts off high voltage when the door is opened;
Grounding system: the test chamber, equipment shell, etc. need to be reliably grounded;
Sound and light alarm: issues warnings before the test starts and when the high voltage is activated;
Emergency stop button: can cut off all power in emergency situations.
6. Data Management and Output Unit (Modern Equipment Configuration)
Function: Records, stores, and prints test reports.
Composition: includes industrial control computers, touch screens, printers, etc., automatically recording the test voltage, leakage current value, and test time of each boot, and automatically determining whether it is qualified or not.
II. Key Points for Equipment Selection
When choosing an insulating boot withstand voltage test device, the following factors need to be comprehensively considered:
1. Compliance (primary consideration)
The equipment should meet or exceed national new standards, including GB/T 17622-202X “Insulating Gloves, Boots, and Socks for Live Working”, DL/T 976-2017 “Preventive Test Procedures for Live Working Tools, Devices, and Equipment”, and technical requirements in power safety regulations.
2. Technical parameters
Higher output voltage: needs to cover the higher test voltage of insulating boots, the factory test voltage of insulating boots is usually 20kV, the preventive test voltage is 15kV, it is recommended that the equipment output be ≥ 25kV to leave some margin;
Output capacity (kVA): determines the load capacity and voltage stability during breakdown, and when testing multiple pairs of boots or large-sized boots, it is recommended that the capacity be ≥ 3kVA;
Leakage current measurement accuracy: a key indicator, the standard requires accurate measurement to the 10mA level, the accuracy should reach ± (1% reading + 2 digits) or higher;
Voltage measurement accuracy: usually requires no less than 1.5 grade.
3. Automation level
The equipment is divided into manual, semi-automatic, and fully automatic types:
Fully automatic equipment can automatically complete voltage increase, timing, voltage reduction, judgment, and recording, with high efficiency and small human error, suitable for units with large testing volume and need for standardized management;
Manual equipment is suitable for scenarios with small testing volume and limited budget.
4. Test efficiency and channel number
The device is divided into single station and multi-station according to workstations. The multi-station device can test multiple pairs of insulating boots at once, significantly improving work efficiency, but the cost is relatively higher.
5. Safety and reliability It is necessary to check whether the access control, overcurrent protection, reliable grounding, and emergency stop functions of the equipment are complete; at the same time, pay attention to the insulation performance and anti-interference ability of the equipment itself.
Post time: Dec-11-2025