Photovoltaic modules, string cables, combiner boxes, and inverters are exposed to outdoor conditions for a long time, which can easily cause damage to the insulation layer of cables, water leakage in junction boxes, and grounding insulation failure due to humidity, lightning strikes, and temperature difference aging, leading to leakage, arcing, hot spots, and even electric shock and fire accidents. According to the IEC62446 photovoltaic safety specification, insulation resistance testing must be completed for power station completion, annual operation and maintenance, and fault repair. Traditional shaking meters have low accuracy and no photovoltaic specific testing mode. Ordinary insulation testers cannot adapt to 1500V high-voltage string, and live testing poses great safety hazards. Jiangsu Jingwei Technology has launched the JW-J25 portable photovoltaic insulation resistance tester, which integrates high-voltage multi gear testing, live string safety detection, and intelligent fault determination functions. It provides a one-stop solution for identifying insulation hazards in photovoltaic systems and safeguarding the electrical operation safety of power stations. AC/DC voltage withstand insulation grounding tester
The insulation testing of photovoltaic high-voltage systems is different from ordinary electrical equipment. During the day, the components continue to generate electricity and there is a DC high voltage in the string. Traditional equipment must disconnect the string and wait for discharge before testing. The operation process is cumbersome, and power outages significantly prolong the inspection time. JW-J25 is equipped with a self-developed photovoltaic live detection algorithm, which can safely complete insulation resistance measurement under normal power generation conditions during the day without disconnecting the photovoltaic string or stopping the discharge. The equipment has a built-in high-voltage isolation protection circuit, which automatically suppresses component power generation voltage interference and measurement values are not affected by on-site lighting. At the same time, it is equipped with real-time voltage monitoring and automatic discharge functions. After the test is completed, residual charges in the circuit are quickly released, and the risk of high-voltage electric shock and arc fire is avoided throughout the process, greatly improving the efficiency of operation and maintenance detection and operational safety. The equipment covers three levels of photovoltaic dedicated test voltages of 500V/1000V/1500V, perfectly adapting to the current mainstream 1000V and 1500V high-voltage photovoltaic systems. The insulation measurement range is 0.01M Ω to 2000G Ω, and the basic measurement accuracy is ± 2%. It can accurately capture subtle insulation aging, cable damage, junction box moisture and other hidden safety hazards.
The whole machine is designed for lightweight outdoor operations, and the body is made of high-strength insulated engineering plastic, weighing only 2.9kg. It is equipped with an anti slip handle and a portable storage bag, and can be carried by a single person to shuttle through rooftops and mountain photovoltaic fields; Equipped with extended insulation safety testing lines, alligator clips, probes, suitable for segmented testing of combiner box terminals, component junction boxes, and string cables. The operation interface adopts a 3.5-inch digital large screen, digital+analog dual display mode, with synchronous and intuitive display of insulation resistance and circuit DC voltage. It supports custom setting of insulation resistance threshold and automatic sound and light alarm when the detection value is lower than the safety standard. The operation and maintenance personnel can quickly determine the insulation fault location on site without the need for later data review. The device is equipped with a large capacity lithium battery, which can complete more than 300 high-voltage insulation tests continuously when fully charged. It does not require external power supply in remote areas without power supply, and can perform uninterrupted inspections throughout the day.
The multiple safety protection design conforms to the photovoltaic high-voltage operation standard. The whole machine has passed the CAT III 1500V high-voltage safety certification and is equipped with multiple protections for overvoltage, overcurrent, reverse connection, overheating, and residual charge. The testing process monitors the circuit status in real time and immediately terminates the high-voltage output in case of abnormalities; The high-voltage output end of the body is equipped with prominent warning signs and an insulated protective shell to prevent the risk of operators accidentally touching the high-voltage terminals. The device integrates data storage and export functions, automatically records insulation resistance, test voltage, test time, and string number for a single test, locally stores 5000 sets of test records, and exports them to a computer through a USB interface to generate an insulation testing ledger, meeting the requirements of power station acceptance, annual operation and maintenance file archiving, and third-party safety testing report issuance. Simultaneously equipped with automatic calculation functions for polarization index and absorption ratio, it accurately evaluates the degree of insulation material attenuation and predicts long-term operational safety risks for cables that have been exposed to moisture and aging for a long time.
JW-J25 application scenarios cover the full range of photovoltaic electrical safety testing: insulation acceptance of newly built photovoltaic power stations, verifying that cables, components, and combiner boxes meet insulation standards; Annual safety inspection of existing power stations to identify aging insulation hazards; Segmented positioning of leakage and grounding faults in faulty power stations, quickly locking damaged cables and failed components; Insulation safety testing for industrial and commercial energy storage supporting photovoltaic systems; Component manufacturing enterprises conduct voltage insulation sampling inspections. The whole machine has IP54 dust and waterproof protection, suitable for various harsh outdoor environments such as rainy weather in the south, sandstorms in the northwest, and salt spray along the coast. The measurement accuracy does not significantly decrease under high and low temperature conditions, and the equipment is durable and suitable for high-frequency use on construction sites.
The person in charge of Jiangsu Jingwei Safety Instrument Business Unit stated that photovoltaic electrical safety is a core and essential requirement for industry operation and maintenance. JW-J25 is specially designed for photovoltaic high-voltage systems, breaking the industry bottleneck of traditional insulation equipment being unable to perform live detection and insufficient range. With its three core advantages of portability, safety, and precision, it reduces the threshold for photovoltaic insulation detection. In the future, enterprises will continue to improve their photovoltaic safety testing product matrix, covering the full dimensional testing needs of insulation, grounding, and voltage resistance. With domestically produced professional testing equipment, they will assist in the standardized safety operation and maintenance of photovoltaic power plants, eliminate electrical safety hazards from the source, and ensure the stable, safe, and long-term operation of the photovoltaic industry.
AC/DC voltage withstand insulation grounding tester, multifunctional electrical comprehensive tester, photovoltaic grounding impedance tester
