Photovoltaic modules, DC cables, and combiner boxes are installed outdoors all year round. Rainwater infiltration, sand erosion, and cable outer skin wear can easily cause insulation layer damage, grounding leakage, and even frequent insulation alarms and power generation drops in inverters. In severe cases, it can lead to short circuit and fire safety accidents. Conventional megohmmeters cannot avoid the interference of self generated voltage of modules, and on-site measurement data during the day is distorted. The industry urgently needs specialized insulation testing equipment for photovoltaics. Jiangsu Jingwei has developed the JW-J25 portable insulation resistance tester, which is equipped with a self-developed photovoltaic anti-interference measurement module. It achieves precise insulation detection under voltage generation and has become an essential instrument for photovoltaic electrical safety inspection. Withstand Voltage Tester
JW-J25 is designed to customize multiple voltage levels for photovoltaic DC systems, covering mainstream photovoltaic system voltage levels of 500V, 1000V, and 1500V. It is compatible with current 1500V high-capacity string power stations and has an insulation measurement range spanning 0.1M Ω~20000M Ω, which can accurately identify micro amplitude insulation degradation hazards; The device has unique photovoltaic anti residual voltage suppression technology, which does not require shading cloth to cover the components, nor does it need to shut down and power off at night. During the day, the components can complete the positive and negative pole to ground insulation test under normal power generation conditions, automatically canceling out the self generated DC voltage interference of the components, solving the industry pain point of traditional instruments that must be tested at night, and greatly improving the efficiency of inspection operations. The instrument can calculate the insulation absorption ratio and polarization index with one click, and intuitively judge the degree of insulation moisture, aging, and hidden damage through changes in these two parameters. It can predict potential leakage faults in advance and achieve pre fault troubleshooting.
The body adopts an industrial anti slip and wear-resistant shell, with anti drop and anti collision design, and is equipped with high-strength insulation test probes. The probe wires are resistant to low temperature and aging, and are not easily cracked in outdoor high and low temperature environments; The whole machine is designed with a low-power circuit, powered by ordinary dry batteries, and can be used for a long time in outdoor environments without external power supply. It has a large digital LCD display, real-time high brightness display of measured values, automatic sound and light alarm for over limit insulation resistance, and quick locking of fault series by operation and maintenance personnel. The device has built-in data storage function, with single measurement data attached with numbered storage. It supports on-site retrieval of historical records, exporting data for later archiving, forming an annual change ledger for power station insulation, and tracking the insulation aging law of lines and components year by year.
From the perspective of actual implementation scenarios, the JW-J25 application runs through the entire cycle of power station construction and operation: during the grid connection acceptance stage of the power station, the insulation of the entire array is checked one by one, and unqualified insulation components and damaged cables are removed to meet the requirements of grid connection specifications; Daily quarterly inspections, regular sampling of key array insulation values, early detection of hidden dangers such as cable skin breakage, frame water ingress, and connector moisture; After the flood season, special inspections will be conducted, and insulation will be retested in batches after being soaked in rainwater to prevent moisture and leakage accidents; Emergency repair of faults, after the insulation alarm of the inverter, segmented and step-by-step testing to lock the fault point, precise disassembly and maintenance, and reduce the loss of large-scale power outage maintenance; The cable production and combiner box factory quality inspection process is used for testing the insulation performance of finished products and controlling the quality of electronic components at the factory.
Jiangsu Jingwei provides detailed operation manuals and online teaching videos, simplifies the threshold for instrument use, and provides lifelong technical Q&A and accessory maintenance after sales. At present, JW-J25 has been widely used in ground centralized photovoltaic, household distributed photovoltaic, and energy storage supporting photovoltaic projects. With domestically produced high reliability insulation detection equipment, it comprehensively safeguards the electrical operation safety of photovoltaic power stations, reduces economic losses and safety risks caused by leakage faults.
Voltage withstand tester, DC voltage withstand insulation impedance, grounding resistance, leakage current, AC/DC voltage withstand insulation grounding tester
