The underground working environment of coal mines and oil wells is harsh, and the annual damage of various types of cables remains high. To save expenses and reduce production costs, most mines and oil wells are equipped with dedicated cable maintenance departments. However, due to traditional testing equipment, the maintenance results are often unsatisfactory. In response to this pain point, our company has independently developed and produced an AC/DC cable detection device, which uses high-voltage breakdown method as the core principle to assist users in accurately locating cable damage points during maintenance. At the same time, it also has the testing function after repairing old cables, providing an efficient solution for underground cable maintenance.
The functional design that combines safety and convenience enables the equipment to adapt to the complex operational needs underground. The equipment consists of a low-voltage control section and a high-voltage rectification, discharge, and testing section. Adequate safety space is reserved between the high and low voltages, as well as between the high and low voltages and the casing, to establish a strong safety defense line structurally. To ensure the safety of equipment and personnel, high-voltage starting requires a dedicated person to operate with a key to avoid the risk of misoperation from the source. During each flaw detection or testing, the high voltage is slowly increased from zero position, equipped with high and low voltage limit devices. The pressure rise and fall process is controlled by buttons, with a stable speed and safe and easy operation.
In terms of testing functionality, the device achieves precise controllability and comprehensive monitoring. The DC withstand voltage test time can be automatically set through digital means or manually controlled, ensuring accurate and reliable testing time; Leakage current can be measured at any time according to the requirements of voltage withstand testing, providing accurate data for cable performance evaluation. The equipment is equipped with a complete protection mechanism, with overcurrent and short-circuit protection functions, and also has a startup warning device to further enhance operational safety.
Humanized operation and display design make the usage process more intuitive and efficient. The control panel integrates power switches, high-voltage start/stop, boost/buck switches and buttons, and is equipped with voltage withstand test digital time timing relays; The display panel is equipped with measuring meters for high voltage, leakage current, low voltage total current, as well as indicator lights for power supply, high voltage, timing, etc. It also has a dedicated observation window for ball gap discharge, which facilitates operators to grasp the real-time operation status of the equipment. In addition, the equipment is equipped with high-voltage discharge rods for discharging after each flaw detection or testing to ensure safe operation. The bottom of the box is clearly marked with grounding signs to strengthen safety regulations.
Stable and reliable technical performance provides support for efficient operation of equipment. The power supply voltage of the equipment is suitable for single-phase AC 220V, 50Hz, and the output voltage of both AC and DC for non-destructive testing is 0-30KV, which can be flexibly adjusted through buttons; Capable of detecting cables up to 3.5km in length, with testing accuracy controlled within ± 30mm, and accurately locating fault points. The automatic voltage withstand test time can be set arbitrarily within the range of 0-30 minutes. The DC leakage current test range is 0-100uA, and the AC leakage current test range is 0-200uA. The rated capacity of the equipment's high-voltage transformer is 6KVA, using single-phase half wave rectification method. The discharge ball gap is adjusted by a handle screw, and the external dimensions are 1100 × 1000 × 1200mm (width × depth × height), with a weight of 180Kg, balancing performance and practicality.
Whether it is accurately locating cable faults or ensuring stable performance of repaired cables, mining cable fault detectors have become the core equipment for underground cable maintenance due to their advantages of safety, efficiency, and precision. They effectively reduce maintenance costs, improve operational efficiency, and provide solid guarantees for the safe production of coal mines and oil wells.