Photovoltaic power plants belong to high-voltage direct current electrical systems, and large-scale outdoor arrays are highly susceptible to lightning strikes and electrostatic impacts. The insulation performance, grounding resistance, and equipotential connection resistance of equipment such as component frames, inverters, combiner boxes, and box transformers meet the standards, directly determining the lightning protection safety and personnel operation safety of the power plant. According to GB/T 32512 Technical Specification for Lightning Protection of Photovoltaic Power Stations and DL/T 475 Guidelines for Grounding Device Testing, the acceptance and annual operation and maintenance of power stations must complete multiple tests for insulation resistance, grounding resistance, equipotential conduction, and SPD lightning arrester performance. The traditional testing mode requires carrying multiple equipment such as grounding resistance meters, insulation rocking meters, and conduction testers, which is cumbersome to transport, complex to operate, and inefficient in testing. Suzhou Laikesi LAILX integrates multiple electrical testing functions and independently develops LXH601 insulation grounding comprehensive tester. It integrates a complete set of photovoltaic lightning protection electrical testing projects in one machine, achieving lightweight, high-precision, and integrated on-site testing, becoming the core equipment for photovoltaic lightning protection safety testing. Multi functional comprehensive electrical appliance

LXH601 integrates four core detection modules, covering all electrical safety testing needs of photovoltaic power plants: firstly, high-voltage insulation resistance testing, supporting multiple output levels of 500V, 1000V, and 2500V, suitable for insulation performance testing of photovoltaic DC cables, component frames, and inverter housings. The insulation resistance measurement range is 0.01M Ω to 100G Ω, accurately determining cable aging, insulation layer damage, moisture leakage hazards; The second is the cross frequency grounding resistance test, using a 128Hz anti-interference testing frequency to avoid on-site 50Hz power frequency electromagnetic interference. It supports multi-mode measurement using the three pole method, four pole method, and clamp method, and is suitable for large-area photovoltaic grounding grids, single component grounding down conductors, and box transformer grounding grids. The grounding resistance measurement range is 0.01 Ω to 20k Ω, fully meeting the industry acceptance standard of photovoltaic array grounding resistance ≤ 4 Ω; The third is the detection of equipotential conduction resistance, with micro Euro level high-precision measurement, which accurately detects the conduction performance between component frames, metal brackets, and equipment casings, determines whether the equipotential connection is reliable, and eliminates the risk of ignition and lightning damage caused by potential differences; The fourth is the performance testing of SPD surge protectors, which quickly measures the varistor voltage and leakage current, determines the aging and failure status of lightning arresters, replaces faulty SPDs in advance, and avoids component breakdown by lightning overvoltage.

The core measurement circuit of the equipment adopts high-precision sampling chips, and the full range measurement error is controlled within ± 1%. The measurement data has metrological calibration qualifications, and the issued detection values can be directly used for project completion acceptance and third-party lightning protection detection reports. The integrated design of the whole machine, with a compact size and a weight of only 4.8kg, is matched with a portable protective case, allowing single person to travel back and forth between the array area and the booster station without pressure; Equipped with a complete set of extended testing cables, grounding testing electrodes, and clamp shaped testing clamps, all testing items can be completed by opening the box without the need for additional auxiliary equipment. The traditional multi instrument half day testing work can be completed in two hours using LXH601, greatly reducing the lightning protection testing period of the power station and reducing manual investment.

The operation interface is equipped with a high-definition color LCD display screen, a Chinese visual menu, and each detection function is independently partitioned. Novices can complete electrode layout, gear adjustment, and data reading according to the interface instructions without the need for deep electrical expertise; The device is equipped with a large capacity storage chip, which can store tens of thousands of sets of insulation, grounding, and conduction test data. Each record is automatically labeled with test points, test voltage, and measurement time, and supports USB data export. It is matched with LAILX lightning protection detection management software, which can generate standardized lightning protection detection reports with one click. The reports automatically summarize grounding resistance, insulation resistance, and SPD status data, in compliance with the archiving standards of meteorological bureaus, power grids, and third-party testing institutions, saving a lot of manual recording and table making work.
The outdoor adaptability design fully matches the photovoltaic field operation environment. The LXH601 host shell adopts IP65 dustproof and waterproof protection, and the internal circuit board is equipped with moisture-proof coating. It can work stably in high humidity coastal areas, rainy southern areas, and dusty northwestern areas; Built in large capacity lithium battery, with a continuous detection time of up to 10 hours when fully charged. Remote mountainous photovoltaics without mains power do not require external power supply; The equipment comes with automatic protection functions against overvoltage, reverse connection, and short circuit. Incorrect wiring on site will not damage the instrument, ensuring the dual safety of testing personnel and equipment. At the same time, the instrument supports automatic calibration function, which automatically completes zero point calibration every time it is turned on. The measurement accuracy is stable for long-term use, and only one measurement calibration is needed per year to maintain compliance testing qualifications.

At present, the lightning protection safety supervision of domestic photovoltaic power plants continues to tighten, and insulation grounding detection has become a mandatory requirement for power plant operation and maintenance. The multi device separation detection mode is no longer suitable for the efficient development needs of the industry. The LXH601 Insulation Grounding Comprehensive Tester, with its core advantages of multi energy, high precision, portability, and high efficiency, innovates the photovoltaic lightning protection detection operation mode. It is widely used in photovoltaic EPC completion acceptance, annual lightning protection inspection, third-party lightning protection detection institutions, power plant safety hazard investigation, wind power plant electrical testing and other scenarios. Suzhou LAILX relies on a comprehensive technical service system to provide factory measurement certificates, one-on-one operation training, and nationwide on-site calibration and maintenance services for LXH601, continuously optimizing equipment measurement algorithms and functional modules. In the future, LAILX will continue to deepen the research and development of new energy electrical safety testing equipment, and use domestically produced comprehensive testing instruments to assist in the standardized and efficient development of lightning protection operation and maintenance in the photovoltaic industry, comprehensively ensuring the electrical operation safety of photovoltaic power stations.

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