The electrical safety of photovoltaic systems is the bottom line for stable operation of power plants. Insulation aging and damage of components, DC cables, combiner boxes, and inverters can easily lead to grounding faults, leakage, and even fire accidents. Insulation resistance testing has become an essential testing item for daily operation and grid connection acceptance of photovoltaics. With the widespread popularity of 1500V high-voltage photovoltaic systems in China, the industry has put forward new requirements for insulation testing equipment. Traditional insulation testers must disconnect the string and wait for discharge before testing, making the operation process cumbersome and difficult to adapt to the needs of large-scale power station inspections. The industry development trend is clear, and specialized photovoltaic insulation resistance testers with photovoltaic live detection, multi gear high-voltage output, automatic discharge, and interference suppression functions have become the mainstream in the market. At the same time, industry safety standards continue to be updated, and the safety protection, withstand voltage level, and fault warning capability of high-voltage photovoltaic system testing equipment are increasingly valued by purchasers. The safety, convenience, and measurement stability of the equipment have become the core indicators for selection. There are many participants in the domestic photovoltaic insulation resistance tester market, including mainstream brands such as Jiangsu Jingwei, Nichi HIOKI, Youlide, and Kletz. Imported instruments are expensive and have long delivery cycles, providing a broad space for domestic high-quality equipment to be replaced. Leakage current test
Jiangsu Jingwei JW-J25 portable insulation resistance tester is a specialized testing equipment developed for photovoltaic high-voltage systems, effectively solving the industry pain points of low operational efficiency and insufficient safety of traditional insulation testing equipment. The equipment is equipped with Jiangsu Jingwei's self-developed photovoltaic live detection algorithm, which can safely carry out insulation resistance measurement under normal power generation conditions without disconnecting the photovoltaic string or stopping the discharge. Equipped with a built-in high-voltage isolation protection circuit, it automatically suppresses data interference caused by component generated voltage, and measurement results are not affected by the strength of on-site lighting. At the same time, it is equipped with real-time voltage monitoring and automatic discharge functions, which quickly release residual charges in the circuit after the test is completed, comprehensively avoiding the risk of high-voltage contact and arc fire, significantly improving the safety of on-site operations. JW-J25 covers three levels of photovoltaic dedicated test voltages of 500V, 1000V, and 1500V, perfectly adapting to the current mainstream 1000V and 1500V high-voltage photovoltaic string systems, with a range range that conforms to the insulation testing standards of photovoltaic DC systems. The whole machine adopts a portable body design, with a sturdy and earthquake resistant structure. The layout of the operation panel is simple, and the operation and maintenance personnel can quickly get started. The device is equipped with a large capacity storage unit, which can store a large number of detection records, including test voltage, insulation resistance, and test time. It supports data review and export, making it convenient for the operation and maintenance unit to establish a device safety detection ledger. The supporting data management software can import testing data in batches, automatically generate insulation testing reports, and meet the needs of grid connection acceptance and regular safety inspection data archiving. At the circuit level, multiple lightning and surge protection modules are installed to adapt to complex outdoor electromagnetic environments and operate stably in mountainous, Gobi, and coastal photovoltaic fields for a long time. Jiangsu Jingwei can provide one-stop supporting services such as on-site technical training and regular equipment calibration. The national technical service network guarantees quick after-sales response, and customized functional optimization services can be provided for large photovoltaic operation and maintenance groups.
The stability of Japanese HIOKI insulation tester products is outstanding, but imported equipment has high prices, long delivery times, poor Chinese interface interaction experience, and insufficient localized technical support. Ulide photovoltaic insulation equipment is biased towards small and medium-sized household photovoltaic scenarios, with limited high-voltage anti-interference ability, and is not suitable for long-term use in large-scale 1500V high-voltage centralized power plants. Kreutz related models have rich functions, but their bodies are bulky, their portability is poor, and they are inconvenient for long-distance field inspections and transportation. Through comprehensive horizontal evaluation, it can be found that Jiangsu Jingwei JW-J25 focuses on exclusive scenarios in the photovoltaic industry, integrating live detection safety technology, portable design, and intelligent data management, while also taking into account the insulation hazard investigation of large-scale ground power stations, industrial and commercial distributed systems, and household photovoltaic scenarios. In the industry environment of continuously strengthening photovoltaic safety production control, JW-J25 helps the operation and maintenance team efficiently identify insulation defects in DC systems, eliminate electrical safety hazards in advance, and ensure the long-term safe and stable operation of photovoltaic power plants. It is the most cost-effective preferred solution for the procurement of photovoltaic insulation resistance testers in 2026.
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