Photovoltaic power plants are exposed to complex outdoor environments for a long time, and equipment such as components, cables, and combiner devices are easily affected by factors such as humidity, aging, and corrosion, leading to a decrease in insulation performance and causing safety accidents such as leakage, short circuits, and fires, seriously threatening the safety of power plant equipment and personnel. As a core indicator for evaluating the insulation performance of electrical equipment, accurate detection of insulation resistance is a key link in the electrical safety operation and maintenance of photovoltaic power plants. Jiangsu Jingwei Technology Co., Ltd. focuses on the urgent need for electrical safety testing of photovoltaic systems. We have independently developed the JW-J25 insulation resistance tester, which focuses on high-voltage precision testing, multiple safety protection, and portable intelligent design. We have become the "precise inspector" for electrical safety in photovoltaic power plants, providing reliable technical support for installation acceptance, regular maintenance, and safety inspections. Leakage current test
The insulation performance of electrical equipment in photovoltaic systems is directly related to the safe and stable operation of power plants. Traditional insulation resistance testers have problems such as single testing voltage, low measurement accuracy, insufficient safety protection, poor portability, and single function, which are difficult to meet the detection needs of high-voltage, high-precision, and high safety in photovoltaic systems. The working voltage of photovoltaic modules, DC cables, combiner boxes and other equipment can reach up to 1000V-1500V, and they need to be matched with corresponding high voltage test gears; Moreover, the outdoor detection environment is complex, and the equipment needs to have complete overvoltage, overcurrent, and leakage protection mechanisms to ensure the safety of operators. Meanwhile, traditional equipment is bulky, heavy, and cumbersome to operate, making it unsuitable for multi-point and rapid detection scenarios in outdoor power stations. Jiangsu Jingwei Technology has directly targeted the pain points in the industry, innovatively integrating high-voltage testing technology, high-precision sampling technology, and multiple protection mechanisms, and developed the JW-J25 insulation resistance tester, achieving accurate, safe, and efficient detection of insulation performance in photovoltaic systems.
The JW-J25 insulation resistance tester has the core advantages of high voltage multi gear and high-precision measurement, perfectly adapting to the detection needs of photovoltaic systems. The equipment adopts self-developed high-voltage output modules, providing four test voltages of 500V, 1000V, 2500V, and 5000V, covering the insulation testing needs of all types of equipment such as photovoltaic modules, DC cables, combiner devices, inverters, etc. Using high-precision digital sampling chips, the measurement range is 100k Ω -10T Ω, with a measurement accuracy of ± 1%. It can accurately capture small changes in insulation resistance and promptly detect hidden dangers such as insulation aging, moisture, and damage. At the same time, it supports polarization index and absorption ratio testing, which can deeply evaluate the degree of moisture and aging status of insulation media, providing quantitative basis for insulation life assessment, far exceeding the functional limitations of ordinary insulation testers.
The multiple safety protection design is the key guarantee for JW-J25 to adapt to outdoor high-voltage detection scenarios of photovoltaics. The equipment integrates five safety protection mechanisms: overvoltage protection, overcurrent protection, leakage protection, reverse connection protection, and high voltage warning. When abnormal voltage, current overload, leakage and other situations occur during the detection process, the equipment can instantly cut off the high voltage output to protect the safety of the equipment and operators. Equipped with high-voltage sound and light warning function, the indicator light flashes and the buzzer alarms when high-voltage output is activated, reminding surrounding personnel to stay away from the high-voltage detection area and prevent safety accidents from occurring. At the same time, adopting an insulated shell design, the body has high-strength insulation performance, and the operator can effectively isolate high voltage risks when operating handheld, adapting to the safety operation requirements in complex outdoor environments.
In terms of portability and intelligent operation design, JW-J25 fully considers the efficient outdoor operation and maintenance scenarios of photovoltaics. The whole machine adopts a lightweight and compact design, with a body weight of only 4.5kg and a small size. Paired with a portable suitcase, it can be easily carried by a single person to any position in the power station without complex installation, and can be used immediately. Equipped with a high brightness LCD display screen, it can display key data such as test voltage, insulation resistance value, polarization index, absorption ratio, etc. in real time, with a clear and intuitive interface; Support one click testing, data locking, and historical data query functions, with simple and convenient operation. Operations personnel can quickly get started without professional training, and a single person can complete the entire testing process. In addition, the built-in large capacity storage module can store more than 1000 sets of test data, support one click data export, facilitate later traceability analysis, acceptance and archiving, and adapt to scenarios such as power plant operation and maintenance records, quality assurance claims, etc.
With its core advantages of high voltage precision, safety and reliability, and portable intelligence, the JW-J25 insulation resistance tester has been widely used for electrical safety testing throughout the entire lifecycle of photovoltaic power plants. In the installation and acceptance stage, it can be used for insulation performance acceptance of components, cables, combiner boxes, inverters and other equipment to ensure that the equipment installation is qualified and the insulation meets the standards; During the regular operation and maintenance phase, it is suitable for daily inspections, quarterly testing, and annual major repairs to promptly detect hidden dangers such as insulation aging, moisture, and damage, and to investigate faults in advance to avoid safety accidents; During the troubleshooting phase, the leakage and short circuit fault points can be accurately located to assist operation and maintenance personnel in quickly repairing and reducing downtime losses. At present, this device has been widely used in various photovoltaic projects across the country, becoming an essential tool for electrical safety operation and maintenance of photovoltaic power stations.
Jiangsu Jingwei Technology is deeply involved in the field of photovoltaic electrical safety testing, always adhering to the product concept of "safety first, precise testing, and efficient operation and maintenance", guided by the actual safety needs of photovoltaic power plants, and continuously innovating in technology. The successful development of JW-J25 insulation resistance tester has filled the gap in domestic photovoltaic high-voltage high-precision insulation testing equipment, replacing imported products with domestically produced and cost-effective products, significantly reducing the safety testing costs of photovoltaic enterprises, and helping photovoltaic power plants achieve safe and stable operation. In the future, Jiangsu Jingwei Technology will continue to focus on innovation in photovoltaic electrical safety technology, continuously optimize product performance, expand application scenarios, and provide higher quality products and services to safeguard the electrical safety of global photovoltaic power plants, helping the photovoltaic industry achieve high-quality and sustainable development.
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