The photovoltaic power station consists of a complete high-voltage electrical system consisting of a 1500V high-voltage DC string, combiner box, inverter, AC/DC cables, and a total station grounding grid. The equipment is exposed to sunlight, rainwater immersion, wind and sand erosion, and temperature differences between day and night all year round. It is prone to electrical faults such as cable insulation layer damage, water leakage and leakage in the junction box, corrosion failure of the grounding grid, poor conductivity of the protection circuit, and substandard insulation resistance of the string to ground. This type of hidden danger has extremely strong concealment, ranging from frequent tripping protection of inverters, continuous decline in power generation of power stations, to serious safety accidents such as high-voltage electric shock to operation and maintenance personnel, equipment short circuit burning, lightning strike breakdown, and station fires. Traditional photovoltaic electrical safety testing requires the separate purchase of multiple devices including insulation resistance tester, grounding resistance tester, conductivity tester, and DC voltmeter. On site operations require frequent replacement of instruments, repeated disassembly and assembly of testing wiring, and a cumbersome and time-consuming inspection process. Most single instruments cannot adapt to 1500V high-voltage photovoltaic string working conditions, with insufficient measurement accuracy and lack of fault location function, resulting in a large number of safety testing blind spots. Suzhou Laikesi New Energy Technology Co., Ltd. (LAILX) has developed the LXH601 Insulation Grounding Comprehensive Tester specifically for photovoltaic high-voltage systems. It integrates eight core electrical safety testing functions and completes photovoltaic full chain safety verification in one stop with a single device. It completely breaks the traditional multi instrument combination testing mode and has become a standardized comprehensive testing equipment necessary for power station completion acceptance, regular electrical safety inspection, and fault repair. Multi functional comprehensive electrical appliance

Traditional split type electrical testing equipment has multiple unavoidable shortcomings in photovoltaic field operations. Operation and maintenance personnel need to carry four or five different instruments, multiple sets of testing cables, and auxiliary grounding probes when going out for inspections. The equipment transportation load is extremely heavy, and it is extremely inconvenient to inspect distributed power stations in mountainous and rooftop areas; Repeatedly disassembling and assembling wiring when testing different projects, the complete electrical safety testing of a single medium-sized power station takes several days, and the labor cost remains high; The maximum output voltage of a regular insulation tester is only 1000V, which cannot match the current mainstream 1500V high-voltage string detection. The measurement values have large deviations and cannot accurately evaluate the insulation status of high-voltage cables; The old-fashioned grounding tester can only measure the grounding resistance value and cannot detect the continuity of the protective circuit. It is also unable to identify hidden dangers such as corrosion and virtual connections in the grounding device; The vast majority of equipment does not have insulation fault location function. After measuring insulation resistance exceeding the standard, it is necessary to dismantle the cable section by section to identify the fault point, which greatly prolongs the repair downtime and causes serious loss of power generation; At the same time, multiple instruments generate multiple scattered detection data, making it difficult to archive and compare them uniformly, and unable to form a complete electrical safety file for power plants. Long term safety trend analysis lacks data support. The LAILX R&D team has been deeply involved in photovoltaic high-voltage safety testing technology, combined with the national photovoltaic power station electrical acceptance standards. After one year, they have completed the special research and development of multifunctional integrated circuits, high-voltage insulation output modules, and fault location algorithms. They have launched the LXH601 integrated insulation and grounding comprehensive tester, which covers all mandatory safety testing projects of photovoltaic systems with one device.

The core advantage of LXH601 lies in its highly multifunctional integration. The equipment integrates eight core functions: insulation resistance testing, grounding resistance measurement, protection continuity detection, DC open/short circuit voltage measurement, accurate insulation fault location, positive and negative pole synchronous insulation detection, polarity verification, and withstand voltage pre-test. No switching of any instruments is required, and multiple key parameter measurements can be completed in one wiring. The efficiency of a single inspection operation is increased by more than 40%, greatly reducing the number of equipment carried and wiring disassembly and assembly processes. The insulation testing module is equipped with four programmable DC high voltage outputs of 250V, 500V, 1000V, and 1500V, which are fully compatible with household low voltage, industrial and commercial 1000V, and large ground 1500V photovoltaic systems. The bipolar DUAL detection mode can simultaneously collect the insulation resistance values of the positive pole to ground and negative pole to ground of the photovoltaic string, accurately determining single pole leakage and bipolar synchronous insulation attenuation faults. The voltage measurement accuracy can reach 0.1V, and the insulation resistance measurement range covers thousands of ohms to gigaohms, accurately distinguishing between minor insulation aging and severe damage leakage faults. The grounding detection module supports multiple grounding testing modes and can measure the grounding resistance of the entire station's grounding grid, single point grounding of supports, and equipment protection grounding. It synchronously detects the continuity of the grounding circuit, identifies hidden dangers such as grounding cable breakage, terminal corrosion and virtual grounding, and insufficient burial depth of grounding electrodes, and strictly meets the lightning protection and grounding acceptance standards of photovoltaic power stations. Exclusive insulation fault location algorithm is equipped. When the insulation resistance exceeds the standard, the equipment automatically calculates the fault distance and accurately locks the fault points such as damaged cables, water seepage junction boxes, component frame leakage, etc. The operation and maintenance personnel do not need to disassemble and investigate in sections, greatly reducing the downtime for fault repair and reducing the loss of power generation in the power station.

The industrial grade portable protection design of the LXH601 is suitable for various complex outdoor working conditions. The LXH601 adopts an integrated sealed and pressure resistant protective chassis, which is dustproof, waterproof, and impact resistant, and can adapt to long-term stable operation in various outdoor environments such as high temperature, cold, high humidity, and sand and dust; The lightweight design of the body, combined with portable handles and straps, allows for easy transportation to rooftop, mountainous, and water power station locations by a single person. It comes with a complete set of testing probes, extended testing cables, and grounding auxiliary electrodes, and can be fully tested upon unboxing. The device is equipped with a high-definition digital LCD display screen, which clearly displays various measurement values in large font. It is matched with physical function buttons, and the operation and reading are not affected in outdoor strong light and low temperature environments. The operation logic is simplified and optimized, and the built-in photovoltaic system detection shortcut program can call the string insulation and whole station grounding acceptance standard detection process with one click. Non professional electricians can independently complete the full set of safety inspections with simple training. The device is equipped with a large capacity rechargeable lithium battery, which can operate continuously for more than 6 hours without an external power grid. It is suitable for all day outdoor inspection operations without carrying an external power adapter for remote and unpowered photovoltaic base inspections.

Intelligent data storage and standardized report output realize the digital upgrade of electrical safety management. The LXH601 has a large capacity storage chip built-in in the local body, which can store tens of thousands of complete detection data. Each set of data automatically records all parameters such as detection time, test voltage, insulation resistance, grounding resistance, conductivity value, fault location distance, etc; Support manual input of power station name, string number, and equipment location information, bind detection data with corresponding photovoltaic units, and establish a complete electrical safety electronic file for the entire station. The device is equipped with a USB data export interface, which allows for one click transmission of detection data to a computer. It is paired with LAILX exclusive photovoltaic safety analysis software, which automatically generates PDF detection reports that meet national acceptance standards. The reports include a list of detection points, raw measurement values, fault point annotations, and safety qualification judgment conclusions. They can be directly used for power plant grid connection acceptance archiving, operation and maintenance safety ledger, and third-party testing qualification document issuance. The software supports batch comparison and analysis of historical testing data, visually displaying the declining trend of insulation and grounding performance year by year, predicting long-term safety hazards such as cable aging and grounding corrosion in advance, promoting the transformation of power station electrical safety from post repair to periodic preventive testing, and avoiding major safety accidents such as electric shock, short circuit, and fire from the source.

The product covers the electrical safety testing requirements of the photovoltaic industry in all scenarios. During the grid connection acceptance stage of newly built photovoltaic power stations, EPC construction units can use equipment to complete a complete set of verification for the insulation of the entire field string, grounding of the support, and protection circuit continuity of the combiner box, ensuring that the electrical construction of the project meets national standards and passes the grid acceptance smoothly; In the regular operation and maintenance of existing power stations, operation and maintenance enterprises use quarterly and annual safety inspections to continuously monitor the aging status of cables and grounding systems, and timely eliminate hidden leakage and grounding failure hazards; For fault repair scenarios, utilizing the insulation fault location function of equipment to quickly lock the leakage point and shorten the downtime for maintenance; Third party testing institutions rely on their equipment's comprehensive safety testing qualifications to complete authoritative testing services such as power station safety assessment, accident identification, and compliance acceptance; At the same time, it is suitable for insulation and grounding safety testing of energy storage power stations and distributed wind power small electrical systems, and can expand the application scenarios of multi-purpose equipment.

The technical director of LAILX in Suzhou introduced that the LXH601 high-voltage insulation output circuit, fault location algorithm, and overall control system are all independently developed, and the core components are domestically replaced. Compared with imported multi in one safety testing instruments, it has significant price advantages. The equipment has undergone multiple rigorous tests such as high-voltage withstand voltage, high and low temperature cycling, waterproof and dustproof, and is stably adapted to various photovoltaic station conditions in China. The enterprise has established a nationwide after-sales service network, providing on-site equipment operation training, annual measurement calibration, and lifelong free software upgrade services. For large photovoltaic groups, it can provide customized development of batch equipment functions to meet the unified operation and maintenance management needs of large-scale stations.

With the popularization of photovoltaic high-voltage systems, electrical safety control has become the core work of power station operation. One stop, high-precision comprehensive safety inspection equipment is a necessary equipment to ensure the long-term safe operation of the station. The Suzhou LAILX LXH601 Insulation Grounding Comprehensive Tester, with its five core advantages of multifunctional integration, 1500V high voltage adaptation, precise fault location, lightweight portability, and intelligent data management, completely solves the industry pain points of traditional split type detection equipment, such as cumbersome operation, multiple detection blind spots, and low efficiency, and comprehensively constructs an electrical safety protection system for photovoltaic high-voltage systems. In the future, Suzhou Laikesi will continue to improve its product matrix for photovoltaic testing across all categories, and collaborate with IV, EL, infrared thermal imaging, and portable weather stations to create a one-stop comprehensive testing solution for photovoltaic stations. With domestically produced high-end testing equipment, it will safeguard the safe and stable development of China's new energy industry.

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