With the comprehensive entry of photovoltaic systems into the era of 1000V and 1500V high-voltage direct current, photovoltaic modules, series cables, combiner boxes, inverters, and bracket grounding systems constitute high-voltage electrical circuits. Electrical hazards such as insulation failure, poor grounding conductivity, cable damage and water seepage account for more than 40% of the total faults in photovoltaic power plants, which can easily cause serious safety accidents such as electric leakage, DC short circuit fire, component PID attenuation, and inverter burnout. According to the national acceptance standards for photovoltaic power stations and grid connection testing standards, insulation resistance testing and grounding continuity testing must be completed simultaneously before grid connection, during annual inspections, and after fault repairs. However, there have been obvious shortcomings in the industry's testing mode for a long time: the operation and maintenance team needs to carry two separate insulation resistance testers and grounding resistance testers, with a large number of accessories, heavy handling, and two outdoor on-site wiring tests, making the process cumbersome and time-consuming; Traditional single function devices have insufficient measurement accuracy and large errors in high-voltage system testing data, making it difficult to accurately locate segmented insulation faults; Some imported comprehensive testers are expensive, have complex operating logic, do not conform to the usage habits of domestic operation and maintenance personnel, and have long after-sales maintenance cycles. Suzhou LAILX focuses on the pain points of electrical safety testing for photovoltaic high-voltage systems, and independently develops the LXH601 insulation grounding comprehensive tester. It integrates three major functions of high-voltage insulation testing, four wire grounding conductivity testing, and intelligent fault positioning into a single handheld device, completing a complete set of safety testing for photovoltaic electrical systems with high precision, portability, and intelligence. It has become the core testing instrument for electrical safety acceptance and operation of photovoltaic power plants. Leakage current test

The core detection performance of LXH601 is fully compatible with mainstream 1500V high-voltage photovoltaic systems. The insulation resistance test provides four adjustable DC test voltages of 100V, 500V, 1000V, and 1500V, covering the full scene detection needs from household low-voltage components to large ground high-voltage string. The insulation resistance measurement range is 0.05M Ω to 10G Ω, and the measurement accuracy error is controlled within ± 3%, fully meeting the requirements of IEC61215 and domestic photovoltaic power station electrical testing national standards. It can accurately identify insulation failure hazards such as cable outer skin damage, junction box water ingress and moisture, component packaging aging, and insulation coating peeling inside the combiner box. The equipment is equipped with LAILX's original GFL insulation fault segmentation positioning algorithm, which does not require full line power-off disassembly. Through segmented testing of resistance value changes, intelligent analysis of fault intervals can quickly identify the specific location of damaged cables and failed components. Compared with the traditional full line one by one troubleshooting mode, the fault positioning efficiency has been improved by more than 70%, greatly reducing the downtime and maintenance time of the power station, and minimizing the loss of power generation. The grounding detection adopts high-precision four wire measurement technology to eliminate numerical interference caused by test line resistance. The resolution of grounding resistance measurement is as low as 0.01 Ω, accurately detecting the grounding conductivity performance of photovoltaic brackets, inverter housings, metal bridge frames, and combiner boxes. It quickly identifies grounding hazards such as broken grounding flat iron, rusted and loose screws, and buried grounding electrode failure, ensuring that the current is quickly introduced into the ground when the high-voltage system leaks, and eliminating the risk of electric shock safety.

The body adopts a lightweight handheld integrated design, which integrates core testing modules, large capacity lithium batteries, high-definition touch operation screens, and is equipped with a complete set of insulation testing probes, grounding four wire testing lines, and insulation protection storage boxes. All accessories are stored in a unified manner, and can be carried by a single person to the rooftop, mountainous, and water surface photovoltaic sites, without the need for multiple people to transport multiple instruments. The built-in long-lasting lithium battery can continuously complete over 200 sets of insulation and grounding joint tests when fully charged, ensuring worry free operation in outdoor scenarios without mains electricity; The equipment is equipped with multiple electrical safety protections, including automatic locking of high-voltage output, reverse connection protection, automatic power-off due to overvoltage, and instantaneous leakage alarm. Real time pop-up safety prompts are provided throughout the operation to prevent operation and maintenance personnel from accidentally touching the high-voltage circuit and causing electric shock risks; The body protection level is IP54, dustproof, waterproof, and moisture-proof. It can work stably in high salt spray coastal areas and humid and rainy mountainous environments. The metal body is resistant to falling and wear, and is suitable for rough working environments on construction sites. The 5-inch high-definition touch screen is visible under strong light, with a Chinese graphical operation interface that automatically guides the step-by-step testing process of insulation and grounding. Newcomers do not need professional electrician training and can complete the full set of testing according to the screen instructions, reducing the threshold for equipment use.

The intelligent data management function is in line with the standardized operation and maintenance archiving requirements of power plants. The LXH601 can synchronously save a complete set of data such as insulation resistance value, grounding resistance value, real-time system voltage, test gear, detection time, etc. for a single detection. It can store tens of thousands of sets of detection records locally and support manual input of photovoltaic string numbers to achieve separate archiving of each set of circuit detection data. After the inspection is completed, all data can be exported with one click through a USB data cable, and Excel and PDF inspection reports that meet the grid acceptance standards can be automatically generated. The built-in national standard inspection conclusion template does not require manual sorting and tabulation, and can be directly used for grid connection filing and annual operation and maintenance file retention. The device is equipped with a wireless Bluetooth transmission module, and the detection data is synchronized in real time to the operation and maintenance tablet. The insulation resistance attenuation trend and abnormal grounding resistance values can be viewed on site, quickly determining the safety level of the circuit, distinguishing qualified circuits, mildly hidden circuits, and high-risk fault circuits, and synchronously recording the fault location for subsequent maintenance follow-up. In addition to photovoltaic exclusive scenarios, the equipment can also be extended to energy storage systems, low-voltage distribution cabinets in substations, industrial electrical equipment, and building lightning protection and grounding detection, reducing the cost of instrument procurement for enterprises with multiple uses.

LXH601 covers the entire process of electrical safety testing in the photovoltaic industry: EPC construction units use it for the completion and acceptance of the insulation and grounding systems of the entire site before the project is connected to the grid, ensuring compliance with grid connection safety standards; The power station operation and maintenance team is used for quarterly and annual preventive inspections to identify hidden electrical hazards in advance and avoid fire and leakage accidents; Quickly locate insulation damage and grounding failure points in fault maintenance scenarios, shortening downtime maintenance cycles; Before the renovation of old photovoltaic power plants, a comprehensive assessment of the health status of the electrical system is conducted to provide data support for cable replacement and grounding system renovation; Third party testing institutions undertake photovoltaic safety assessment and insurance loss assessment projects, and issue authoritative safety testing data. After multiple domestic power grid cooperation testing institutions and large new energy operation and maintenance groups purchased LXH601 in bulk, feedback was received that the single site electrical testing period was shortened by half, and there was no need to carry multiple instruments. The on-site wiring process was greatly simplified, and the stability and accuracy of measurement data were better than traditional discrete testing equipment.

As an innovative product for comprehensive testing of domestic photovoltaic safety regulations, Suzhou LAILX has independently developed core algorithms and high-voltage modules for integrated insulation and grounding equipment, breaking away from overseas brand technology monopolies. At the same time, it has established a complete domestic after-sales service system, with a three-year warranty for the whole machine and lifelong calibration of core high-voltage modules. Offline technical training outlets have been set up in photovoltaic concentrated areas in various provinces and cities across the country, providing customers with free equipment operation and electrical testing specification training. The current domestic photovoltaic safety control standards continue to tighten, and normalized electrical testing of high-voltage systems has become a mandatory requirement. Lightweight, integrated, and intelligent comprehensive testing instruments are an inevitable trend in the industry's development. The LXH601 Insulation Grounding Comprehensive Tester, with its core advantages of one machine dual testing, precise positioning, portability and durability, and high cost-effectiveness, continues to empower the refined operation and maintenance of photovoltaic power station electrical safety, safeguard the stable and safe operation of millions of photovoltaic projects, and assist in the upgrading process of domestic new energy electrical safety testing equipment.

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