The photovoltaic system is exposed to outdoor sun and rain, temperature fluctuations, and sandstorms for a long time. There are frequent hidden dangers such as aging of cable sheaths, water ingress into junction boxes, insulation damage to component frames, and leakage of combiner boxes, which can easily cause safety accidents such as electric shock, short circuit fires, and inverter burnout for operation and maintenance personnel. According to GB/T and IEC photovoltaic safety testing standards, special insulation resistance testing must be completed for power station completion, grid connection, annual operation and maintenance, and fault diagnosis. Traditional shaking meters have low accuracy and no high-voltage multi gear adaptation. Ordinary insulation testers cannot adapt to 1500V high-voltage photovoltaic strings, and lack photovoltaic specific fault location functions. Large area array troubleshooting is time-consuming and labor-intensive. Jiangsu Jingwei has developed the JW-J25 portable insulation resistance tester to meet the safety testing requirements of photovoltaic high-voltage systems. It features multi level high-voltage output, ultra large impedance measurement, intelligent fault segmentation positioning, and outdoor three proof portable design. It provides one-stop insulation safety testing for all types of components, strings, combiner boxes, and inverters, becoming a standard safety testing equipment for photovoltaic engineering and operation and maintenance enterprises. Multi functional comprehensive electrical appliance
JW-J25 is specially designed for photovoltaic 1500V high-voltage systems, with insulation test voltage settings of 500V/1000V/1500V three levels of output, perfectly matching household low-voltage components, industrial and commercial 1000V systems, and large ground 1500V high-voltage string with different withstand voltage testing standards, covering the current mainstream photovoltaic system voltage specifications. The equipment is equipped with a high-precision high-voltage measurement module, which can measure up to 100G Ω of ultra large insulation resistance, accurately identifying small insulation damage, moisture leakage hazards, with a resolution of 0.1M Ω. It can clearly distinguish between good insulation, slight moisture, and severe damage levels, avoiding the problem of hidden dangers and missed detections caused by low precision of ordinary equipment. Built in anti reverse high voltage protection circuit can resist residual voltage impact of photovoltaic string. Even if the power is not completely cut off on site, safe detection can be carried out without waiting for the array to fully discharge, greatly reducing the waiting time for on-site detection and improving the efficiency of operation and maintenance inspection.
The core is equipped with a photovoltaic specific insulation fault segmentation positioning algorithm. Unlike traditional equipment that can only provide overall insulation values, the JW-J25 intelligently analyzes the approximate range of faults by measuring the resistance difference in segments. It quickly locks in the positions of leakage string, damaged cables, and water seepage junction boxes, eliminating the need for blind inspection of the entire array string by string. The fault positioning time is shortened by more than 70%, greatly reducing the outdoor workload of operation and maintenance personnel. The equipment supports dual-mode measurement of insulation absorption ratio and polarization index. For cables and components that have been severely affected by long-term moisture and aging, the degree of insulation aging is determined by the resistance ratio of two time periods, and the risk of long-term operation leakage is predicted in advance to achieve preventive safety maintenance and avoid electrical safety accidents in power plants from the source.
The adaptability for outdoor work has been fully upgraded, with an integrated handheld body that weighs only 2.8kg. It is paired with a wear-resistant and shock-absorbing handbag, making it easy for a single person to carry for climbing and mountain inspections without any burden; The body is IP64 dustproof and waterproof industrial protection, stable operation in rain, dust, high and low temperature environments, suitable for various photovoltaic field conditions such as desert, high salt spray along the sea, and severe cold in mountainous areas. Equipped with 3-meter extended high-voltage test probes and insulated safety protection clips, remote detection of high-altitude components and combiner box terminals does not require climbing or close contact, improving the safety factor of operators; 4-inch high-definition backlit display screen, with clear numerical values in low light environments at night and on cloudy days. The large screen synchronously displays test voltage, real-time insulation resistance, absorption ratio, and test duration, making the data clear at a glance. The operation logic is minimalist, with a rotating gear to select the test voltage, one click start of automatic timing measurement, and automatic locking of values when reaching the standard duration. Novices can independently complete a full set of safety inspections through simple training, reducing the employment threshold for professional inspection personnel in enterprises.
Intelligent data management meets the requirements of standardized archiving. Single test data is automatically stored locally, and thousands of insulation testing records can be saved. The power station name, array number, and testing date are marked for easy traceability of later records; Supports USB data export, with computer software automatically generating photovoltaic insulation testing reports, which can be directly used for grid connection acceptance and annual operation and maintenance filing materials. The report format fully matches the requirements of the power grid and third-party testing institutions. The device is equipped with multiple safety protections for overvoltage, overcurrent, and leakage. In case of short circuit or insulation breakdown during the testing process, the device will immediately cut off the high-voltage output and sound and light alarm prompts, fully ensuring the personal safety of operators and eliminating the risk of electric shock during high-voltage detection.
Full scene coverage of photovoltaic electrical safety testing requirements: During the completion stage of photovoltaic projects, it is used for insulation verification of the entire station array, meeting the mandatory acceptance conditions for grid connection and avoiding rework during project acceptance; Annual operation and maintenance physical examination of existing power stations, comprehensive investigation of insulation aging hazards in cables, components, and combiner boxes, and early elimination of the risk of leakage and fire; Fault repair scenario, quickly locate the location of insulation damage, accurately replace faulty components, and reduce downtime and power generation losses; Component manufacturing enterprises and inverter manufacturers, used for insulation safety inspection of finished products at the factory, strictly controlling product factory safety standards; A third-party electrical testing agency, as a high-voltage insulation measurement tool, issues compliance and safety testing reports.
Jiangsu Jingwei has been deeply involved in the research and development of photovoltaic electrical testing equipment for many years. The JW-J25 core high-voltage measurement circuit and safety protection module are all independently developed, abandoning the use of external general circuit solutions and optimizing the adaptability of photovoltaic DC high-voltage scenarios. Compared with similar imported equipment, it has a high cost-effectiveness and faster after-sales maintenance response speed. Each device undergoes multiple rigorous tests including high voltage aging, exposure to rain, and dropping before leaving the factory, ensuring stability and durability. In the context of large-scale and high-voltage development of photovoltaic power plants, electrical safety is the core bottom line that cannot be ignored in the industry. The JW-J25 insulation resistance tester, with its comprehensive advantages of accurate measurement, safety and reliability, and high efficiency and convenience, builds a solid electrical safety barrier for the full life cycle operation of photovoltaic power plants, and helps the photovoltaic industry to develop safely, standardizedly and with high quality.
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