Photovoltaic systems are installed outdoors all year round, and components, cables, and junction boxes are prone to insulation layer damage due to rainwater immersion, sand and dust erosion, and low-temperature freezing and thawing. The decrease in insulation resistance to ground can trigger safety accidents such as leakage, frequent inverter alarms, short circuits, and fires. According to the GB/T42006 Photovoltaic Equipment Inspection Specification, the grid connection acceptance and annual operation and maintenance of power stations must carry out full system insulation resistance testing, and dedicated photovoltaic insulation testers have become a necessary safety control tool. Jiangsu Jingwei relies on the accumulation of power detection technology to develop the JW-J25 insulation resistance tester, which is designed to optimize algorithms for photovoltaic DC systems, solve the pain points of ordinary megohmmeters being affected by photovoltaic self generated voltage interference and reading distortion, and comprehensively cover insulation detection work for components, combiner boxes, inverters, and DC cables. Multi functional comprehensive electrical appliance
JW-J25 sets three standard test voltages of 500V, 1000V, and 2000V, perfectly matching the current mainstream photovoltaic system voltage levels of 1000V and 1500V. The measurement range is 0~20000M Ω, which can accurately capture small insulation degradation hazards; The equipment is equipped with a self-developed photovoltaic residual voltage elimination module, which can automatically cancel out the self generated DC voltage interference caused by component exposure to light. It can conduct on-site testing during the day without the need for full coverage of shading cloth, changing the limitation of traditional equipment that can only perform shading testing at night and reducing testing time by 70%. In addition to the basic insulation resistance value, the instrument also supports the calculation of absorption ratio and polarization index synchronously. Through two parameters, it accurately determines the degree of insulation moisture and material aging, distinguishes between instantaneous water ingress faults and long-term aging hazards, and provides a graded disposal basis for fault maintenance.
The product stands out in terms of safety and portability design. The entire machine adopts a double insulated protective body, and the test terminals are equipped with high-voltage anti electric shock warnings. The high-voltage output automatically alarms instantly, eliminating the risk of electric shock for operators; The lightweight design of the body, combined with portable hooks and protective bags, makes it easy for operation and maintenance personnel to carry the photovoltaic array with them. High definition digital display screen with backlight design, clear reading in low light environment in morning and evening, built-in large capacity rechargeable lithium battery, can continuously complete hundreds of insulation tests for the entire string when fully charged, eliminating the trouble of frequent replacement of dry batteries; The test data can be stored locally and exported via USB for archiving, making it convenient to organize the insulation testing ledger and meet the requirements for archiving power grid acceptance data.
Since its launch in the market, JW-J25 has been widely used in the completion acceptance and periodic inspection of centralized ground power stations, industrial and commercial photovoltaic, and energy storage supporting photovoltaic projects. In previous years, the rooftop photovoltaic system in a certain industrial park in southern China experienced frequent insulation failure alarms during the rainy season. After using the JW-J25 full system inspection, three cable outer skin damage points were accurately located. After repair, the number of downtime due to faults decreased by 90% throughout the year, avoiding the risk of leakage and fire and loss of power generation. Jiangsu Jingwei continues to optimize its models for energy storage photovoltaic integration projects, adapting to the insulation testing needs of high-voltage energy storage clusters and providing on-site operation guidance services. In the increasingly strict environment of domestic photovoltaic safety supervision, the normalization of insulation testing has become an industry trend. JW-J25, with its photovoltaic special optimization performance, continues to assist photovoltaic enterprises in implementing safety production standards, avoiding system safety hazards from the source of electrical testing, and ensuring the safe and long-term operation of photovoltaic assets
Multi functional comprehensive electrical appliances, AC/DC withstand voltage insulation grounding tester, safety comprehensive tester
