With the widespread adoption of 1500V high-voltage direct current photovoltaic systems, the power generation losses of photovoltaic power plants have been further reduced, and the profits of power plants have been improved. However, the electrical safety risks brought by high-voltage systems have also increased. Photovoltaic modules, DC cables, combiner boxes, and grounding grids operate outdoors all year round, exposed to sunlight, rain, salt spray corrosion, and aging due to temperature differences between day and night. They are prone to hidden dangers such as cable insulation damage, water leakage from junction boxes, corrosion and virtual connection of grounding terminals, and failure of equipotential conduction. This type of fault has extremely strong concealment and is difficult to detect in the early stages. It can cause frequent tripping of the inverter, continuous decrease in power generation, and serious safety accidents such as electric leakage, DC arc fire, and lightning damage to equipment. According to the relevant regulations of photovoltaic power stations, multiple safety inspections such as insulation resistance, grounding resistance, continuity of conduction, etc. need to be completed for the grid connection acceptance of new photovoltaic projects, annual preventive testing of existing power stations, and fault repair and troubleshooting. The traditional detection scheme requires carrying multiple devices such as insulation shake meters, grounding resistance testers, and conductivity testers, repeatedly changing wiring, cumbersome field handling, low detection efficiency, and easy measurement errors caused by wiring errors. Shanghai LAILX has developed the LXH601 insulation grounding comprehensive tester to address the pain points of photovoltaic high-voltage systems, achieving integrated multi class safety testing functions. One device completes the electrical safety testing of the entire photovoltaic chain. Multi functional comprehensive electrical appliance

LXH601 breaks the limitations of traditional instruments with a single function, integrating insulation resistance testing, grounding resistance testing, circuit conduction testing, AC/DC voltage measurement, and insulation fault location functions. A single device replaces multiple traditional safety instruments, greatly reducing the number of instruments carried on site, simplifying wiring processes, and shortening on-site testing hours. The insulation detection module supports bipolar DUAL detection mode, which can synchronously measure the insulation resistance of photovoltaic positive and negative poles to ground. The insulation measurement range covers 0.02M Ω to 2000M Ω, and the test voltage can be adjusted in multiple levels to adapt to different voltage levels of photovoltaic string insulation screening, accurately capturing insulation degradation hazards such as cable outer skin damage, junction box water ingress, and component insulation layer aging. The measurement of grounding resistance is compatible with multiple testing modes such as the three pole method and the two pole method, with a range of 0.01 Ω to 30k Ω. It can detect the performance of the power station grounding network, equipment protection grounding, and equipotential connection, and determine whether the grounding has failed or whether the grounding terminal is corroded or falsely connected. The circuit continuity function is used to check the continuity of the protective ground wire, ensure reliable current discharge in case of faults, and reduce the risk of electric shock and fire.

The equipment is equipped with LAILX's self-developed GFL insulation fault location technology, which monitors the insulation resistance of the string conductor to ground in real time, identifies resistance mutation points through intelligent algorithms, and quickly locates the string where the insulation fault is located. The operation and maintenance personnel do not need to investigate the entire array segment by segment, directly locking the fault area, greatly shortening the fault investigation time. It is particularly practical in high incidence scenarios of insulation faults in humid and rainy seasons. The whole machine adopts an industrial grade portable protective shell, which is anti fall and dust-proof, suitable for outdoor power station site carrying. The large screen high-definition LCD display screen has clear readings under strong outdoor light, and the operation menu is simple, making it easy for inspectors to get started quickly. The device has built-in large capacity storage to store all test data, supports USB export and wireless transmission, and is equipped with analysis software to automatically generate safety inspection reports that comply with GB and IEC standards for photovoltaic electrical safety. The reports can be directly used for grid connection acceptance and annual preventive test data archiving. The hardware circuit is equipped with multiple electromagnetic shielding designs, ensuring stable and accurate measurement data even in strong electromagnetic interference environments at the power plant site, and reducing reading drift caused by electromagnetic interference.

Once an electrical safety accident occurs in a photovoltaic power station, it can cause huge equipment damage and even threaten the safety of on-site personnel. Normalized insulation and grounding testing is a mandatory requirement for the safe operation and maintenance of the power station. The LXH601 insulation grounding comprehensive tester is widely applicable in centralized ground power stations, industrial and commercial distributed rooftop power stations, and energy storage supporting photovoltaic systems. It can be used in power station grid connection acceptance, annual preventive testing, fault repair, power station asset evaluation and other scenarios. It is an essential safety testing equipment for third-party testing institutions, EPC general contracting enterprises, and power station operation and maintenance teams. Shanghai LAILX provides complete technical support services, including equipment operation training, on-site inspection guidance, annual measurement calibration, and after-sales fault repair, to help customers carry out photovoltaic electrical safety testing work in a standardized manner. LXH601 adopts an integrated design with multiple functions, simplifying the photovoltaic safety inspection process, improving on-site inspection efficiency and data reliability, and building a complete electrical safety inspection system for high-voltage photovoltaic power plants. It continuously safeguards the safety of photovoltaic power plant equipment and personnel, ensuring the long-term stable and safe operation of the photovoltaic system.

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