With the widespread use of 1500V high-voltage photovoltaic strings, the electrical safety risks of photovoltaic power plants continue to increase. Problems such as aging insulation of component cables, corrosion and loosening of grounding terminals in combiner boxes, grounding failure of inverters, and poor equipotential connections occur frequently, which can easily lead to safety accidents such as leakage, short circuits, arc ignition, and personnel electric shock. Electrical safety testing has become a mandatory core link for power plant acceptance, annual preventive testing, and fault investigation. The traditional detection mode requires carrying multiple devices including insulation resistance tester, grounding resistance tester, and conductivity tester separately, switching instruments back and forth, and repeating wiring. The operation process is cumbersome, and the data fluctuates greatly under outdoor electromagnetic interference, making it difficult to guarantee measurement accuracy and low detection efficiency. Suzhou Laikesi LAILX has launched the LXH601 Insulation and Grounding Comprehensive Tester to address the pain points of electrical testing for photovoltaic high-voltage systems. It integrates four core functions: insulation, grounding, conduction, and AC/DC voltage detection, achieving one-stop electrical safety testing for photovoltaic systems with a single device, filling the gap in high-precision photovoltaic safety testing equipment integration in the industry. Leakage current test

LXH601 breaks the limitation of traditional instruments' "single function" and covers all safety testing projects for photovoltaic operation and maintenance with one device. The insulation resistance test supports multiple levels of DC testing voltage and is compatible with up to 2500V high-voltage string detection. The measurement range covers 0.1M Ω to 10G Ω, accurately determining the aging, moisture damage, and pinhole defects of the insulation layer inside components, DC cables, and inverters. It automatically calculates the polarization index and deeply evaluates the long-term attenuation trend of insulation materials; The grounding resistance test supports multiple measurement modes such as three pole method, two pole method, and selected electrode method, with a wide range adaptive range of 0.01 Ω to 30k Ω. It can stably and accurately measure high resistivity soil in mountainous areas, salt alkali corrosion grounding grids, and distributed simple grounding devices to determine whether the grounding grid meets safety standards; The equipotential conduction function can quickly detect the grounding continuity of metal brackets, combiner box shells, and inverter cabinets, and identify potential hazards such as loose terminals and cable oxidation and disconnection; AC/DC voltage measurement can synchronously collect the open circuit voltage of the string and the AC voltage of the power grid, assisting in the troubleshooting of short circuits and broken string faults. The four tests do not require equipment replacement, and a complete set of measurements can be completed in one wiring, improving on-site operation efficiency by more than 70%.

Hardware accuracy and anti-interference capability are specially optimized for the complex electromagnetic environment of photovoltaic power plants, using a four wire precision sampling circuit to completely eliminate numerical errors caused by the resistance of the testing cable itself; Built in multi-level digital filtering adaptive algorithm effectively suppresses high-frequency electromagnetic interference from inverters and frequency converters. The data is stable and drift free in windy, humid, and salt spray environments, and the measurement accuracy meets IEC61215 and IEC61730 photovoltaic international testing standards. The whole machine is equipped with a 7-inch outdoor high brightness touch color screen, with clear and visible values under strong light. The touch screen and physical buttons are dual controlled, and it can be operated smoothly even with insulated gloves. The operation interface is fully in Chinese, with intelligent guidance for detection steps, automatic setting of testing duration and voltage rise and fall rate, and automatic sound and light alarm when the threshold is reached, without the need for manual full process monitoring. The device has built-in intelligent judgment logic, pre-set insulation and grounding qualification thresholds for the photovoltaic industry, automatically marks qualified/unqualified after detection, and quickly locks in electrical safety hazards.

The safety protection system comprehensively ensures the safety of high-voltage operators. The whole machine is equipped with a high-voltage isolation circuit and an automatic discharge module. The residual voltage in the circuit is released immediately after the test is completed to eliminate the risk of electric shock caused by residual charges; Equipped with multiple software and hardware protections for overvoltage, overcurrent, leakage, and reverse connection, the output is immediately cut off in case of abnormal working conditions, in compliance with safety regulations for high-voltage power operations. The body is enclosed in a portable high-strength protective box, with a lightweight design for the entire machine. It can be carried by a single person for transportation and has IP67 dust and waterproof protection, making it suitable for harsh outdoor working conditions such as rain, dust, low temperature, and extreme cold; Equipped with a large capacity lithium battery, it supports continuous 8-hour full day testing on a single full charge, meeting the batch testing needs of large ground power stations. Locally, it can store thousands of sets of testing records, with complete retention of testing voltage, resistance values, testing time, and equipment numbers for each set of data. It supports exporting data from USB flash drives and Bluetooth, and is equipped with PC analysis software to automatically generate standardized electrical safety testing reports. It can be directly used for power station completion acceptance, annual power safety inspection, fault rectification and archiving, and the data can be traced throughout the process.

Currently, LXH601 has been widely used in scenarios such as grid connection acceptance of new photovoltaic projects, annual safety preventive testing of power stations, fault and leakage investigation, safety assessment of old photovoltaic renovations, and electrical testing of energy storage facilities. Multiple new energy engineering enterprises and third-party power testing institutions have purchased and implemented it in bulk. The LAILX R&D team in Suzhou stated that LXH601 integrates the full requirements of photovoltaic safety testing, solves long-term pain points in the industry such as multi instrument portability, repeated wiring, and insufficient accuracy, and balances the four advantages of portability, multifunctionality, high precision, and high safety. In the future, the brand will continue to expand its equipment expansion functions, add arc detection and RCD leakage protection testing modules, improve digital data management systems, and create a one-stop detection solution for photovoltaic electrical safety. Professional detection instruments will be used to strengthen the electrical safety defense line of photovoltaic power plants, and help promote the standardized and regulated operation and maintenance development of the new energy industry.

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