Photovoltaic power plants belong to high-voltage direct current electrical systems. Components, cables, combiner boxes, inverters are exposed to complex outdoor environments such as sunlight, rain, wind and sand, humidity, salt spray, etc. for a long time. Problems such as aging and damage of cable insulation layers, water leakage from junction boxes, corrosion and failure of grounding devices, and poor grounding conductivity of brackets occur frequently, which can easily cause major safety accidents such as leakage, electric shock to personnel, DC short circuits, lightning damage to equipment, and fires. According to the testing standards of State Grid Corporation of China and the new energy industry, multiple safety tests such as insulation resistance, grounding resistance, conductivity, AC/DC voltage, etc. must be completed simultaneously for grid connection acceptance, annual operation and maintenance, and component factory quality inspection of photovoltaic projects. The traditional detection mode requires multiple devices including insulation resistance tester, grounding resistance meter, conductivity tester, and voltage multimeter to be carried separately. The operation and maintenance personnel need to transport and repeatedly replace the wiring, which takes a long time for a single inspection and makes manual comparison of data from multiple devices prone to errors. In complex electromagnetic environments, the measurement data of old-fashioned instruments drifts severely, and the detection accuracy cannot meet the requirements of high-voltage photovoltaic systems. Suzhou Laikesi LAILX has developed and launched the LXH601 insulation grounding comprehensive tester to address the pain points in the photovoltaic electrical safety testing industry. It pioneered a multi detection function integrated architecture and completed eight safety inspection projects with one device. Equipped with four core technologies: high-voltage precision measurement, intelligent fault location, strong electromagnetic anti-interference, and portable industrial body, it provides a one-stop solution to strengthen the electrical safety defense line of photovoltaic power stations. Multi functional comprehensive electrical appliance

The core innovation of LXH601 lies in breaking the limitations of traditional instruments' "one machine, one use", integrating eight core detection functions: insulation resistance testing, grounding resistance testing, equipotential conduction testing, AC/DC voltage measurement, open circuit voltage Voc, short-circuit current Isc detection, insulation fault segmentation positioning, and grounding impedance analysis, covering all electrical safety detection needs of the entire photovoltaic chain. Previously, a complete set of safety inspections that required three or more instruments can now be achieved with just one LXH601 device, eliminating the need for frequent instrument replacement, repeated disassembly and testing of wiring. The duration of a single string full set of safety inspections has been reduced by more than 65%, and a single person can independently complete the inspection work that originally required three people to cooperate, greatly reducing operation and maintenance manpower and equipment procurement costs. The maximum output voltage for insulation testing can reach 1500V, perfectly adapting to the current mainstream 1000V and 1500V high-voltage photovoltaic string. The insulation resistance measurement range covers 0.01M Ω to 10G Ω, with a measurement accuracy of ± 2% reading. It can accurately identify hidden insulation defects such as small insulation damage of cables and water leakage and leakage of component backboards; The grounding resistance test adopts a professional measurement mode of four wire method to eliminate the interference of lead resistance, with a range of 0.01 Ω to 2000 Ω. It accurately detects the conductivity of bracket grounding, array grounding, and equipment protection grounding, determines safety hazards such as grounding electrode corrosion and grounding flat iron fracture, and fully meets the lightning protection grounding detection specifications of photovoltaic power stations.

The equipment is equipped with Lexus' self-developed GFL insulation fault location patent technology, which is different from the traditional large-area blind fault mode. It can quickly lock the precise fault string and point of cable damage, junction box water ingress, and component insulation failure through intelligent analysis of segmented resistance data mutation. Operation and maintenance personnel do not need to dismantle cables section by section for troubleshooting. They can conduct targeted maintenance based on equipment fault prompts, which improves the efficiency of fault troubleshooting several times. It is especially suitable for detecting insulation leakage faults that occur frequently in humid and rainy coastal areas. At the hardware level, it is equipped with multiple electromagnetic shielding structures, with a double-layer shielding cover and broadband filtering circuit built into the body. It is specially optimized for high-frequency harmonics of photovoltaic inverters and electromagnetic interference environments of combiner boxes. The measurement data is drift free and hop free under complex electromagnetic fields in power plants, solving the industry pain points of large outdoor measurement errors and unreliable data of old-fashioned instruments. The issued detection data can directly serve as an effective basis for grid connection acceptance and third-party safety notarization.

The portable industrial body is suitable for complex outdoor work scenarios. The LXH601 machine adopts an integrated and compact design, with a weight of only 3.6kg and a hard protective carrying case. It can be placed in maintenance vehicles, backpacks, and can be easily carried and operated in narrow spaces on rooftops and remote mountainous areas. The body shell is made of flame-retardant insulation industrial materials, IP53 dustproof and waterproof protection, anti drop and wear-resistant, stable operation at high and low temperatures -10 ℃ to 50 ℃, and long-term use of components in desert and coastal salt spray fields without aging or failure. The operation interface is equipped with a 4.3-inch color LCD screen, full Chinese menu, one click preset testing process, and supports custom 50 sets of photovoltaic dedicated detection programs. It automatically completes high-voltage self check and line reverse identification when turned on. When overvoltage, leakage, or wiring errors occur, it will sound and light dual alarms, and automatically cut off high-voltage output to eliminate the risk of electric shock safety during on-site high-voltage testing. After the test is completed, the screen will display the complete set of test values and qualified judgment results synchronously, with automatic PASS/FAIL identification, without the need for manual calculation and comparison.

Data management is digitally adapted to the photovoltaic intelligent operation and maintenance system. The equipment can store tens of thousands of complete detection records locally, and each data is synchronously retained with detection time, field number, string number, and operator information, with complete traceability information; Supports USB data export, paired with PC analysis software to generate standardized electrical safety inspection reports in bulk, automatically summarizing insulation failure and grounding failure hidden danger points, forming a rectification list, and the report format conforms to the acceptance standards of the energy regulatory department. It can be directly used for project archiving, quality assurance verification, and safety inspection ledger retention. The power supply scheme adopts a built-in large capacity lithium battery, which can continuously complete uninterrupted inspections for a whole day when fully charged. It supports Type-C fast charging and does not require external power supply in outdoor scenarios without mains power. The matching external adapter can achieve long-term fixed point continuous monitoring.

At present, the LXH601 insulation grounding comprehensive tester has been widely used in centralized photovoltaic power plant annual safety inspections, industrial and commercial distributed photovoltaic grid connection acceptance, photovoltaic module factory factory safety inspection, energy storage inverter safety testing, photovoltaic power plant lightning protection special testing and other scenarios. According to the operation and maintenance data of a 100 MW coastal photovoltaic power station, the introduction of LXH601 has shortened the entire electrical safety testing cycle from 10 days to 3 days, reduced the missed detection rate of insulation and grounding faults by 90%, and prevented safety accidents caused by leakage and grounding failures throughout the year. The equipment investment cost was fully recovered through labor cost savings in operation and maintenance within six months. According to feedback from third-party testing agencies, the integrated equipment greatly simplifies the on-site testing process, significantly improves project delivery efficiency, and has been recognized by power grid departments in various regions for data compliance.

With the popularization of high-voltage photovoltaic systems and the continuous tightening of safety control standards for new power systems, one-stop, high-precision, and portable safety testing equipment has become a necessity in the industry. The Suzhou LAILX LXH601 Insulation Grounding Comprehensive Tester, with its four core advantages of integration, high precision, intelligence, and high safety, fills the gaps in photovoltaic electrical safety detection equipment and provides reliable detection support for the safe operation of the entire lifecycle of photovoltaics. In the future, Laikesi will continue to upgrade its high-voltage testing range and fault location algorithm, adapt to the new 2000V high-voltage photovoltaic system, continuously optimize the performance of domestic photovoltaic safety testing instruments, and assist in the standardization and refinement of electrical safety control in photovoltaic power plants nationwide.

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