The photovoltaic system consists of multiple electrical structures such as high-voltage direct current strings, combiner boxes, inverters, cables, and grounding grids. The equipment is subjected to long-term erosion from rainwater, humidity, and wind and sand, and problems such as aging and damage of cable insulation layers, corrosion and failure of grounding devices, leakage of power lines, and excessive grounding resistance occur frequently, which can easily cause major safety accidents such as electric shock, short circuit, lightning damage, and fire. Traditional electrical safety testing requires separate equipment such as insulation resistance tester, grounding resistance tester, conductivity tester, and DC voltmeter. It is cumbersome to carry, the testing process is fragmented, and data from multiple devices is difficult to archive uniformly. On site testing is time-consuming, and some instruments cannot adapt to the 1500V high-voltage string working conditions of photovoltaics, resulting in insufficient measurement accuracy and safety blind spots. Suzhou Laikesi LAILX has developed the LXH601 Insulation and Grounding Comprehensive Tester specifically for electrical testing of photovoltaic high-voltage systems. It integrates eight core functions: insulation testing, grounding resistance, protection conduction, DC high-voltage measurement, and insulation fault location. A single device completes the electrical safety compliance testing of the entire photovoltaic chain, providing a one-stop solution to industry pain points such as cumbersome operation, insufficient accuracy, and poor scene adaptation of multiple devices. It has become a standardized core equipment for photovoltaic acceptance and operation and maintenance electrical safety testing. Multi functional comprehensive electrical appliance

The LXH601 machine adopts an industrial grade integrated portable chassis design, with a compact body structure. The protective box integrates handles and shoulder straps, making it easy for a single person to carry and transport. It is suitable for multi scene mobile detection in rooftop photovoltaics, mountain power stations, distribution rooms, and energy storage converter rooms. The internal modular partition of the chassis stores the complete set of accessories for testing cables, grounding probes, and insulation fixtures, without the need for additional packaging and storage. The whole machine has a protection level of IP65, is dustproof and waterproof, and can perform insulation and grounding tests in rainy and high humidity outdoor environments. The working temperature covers -10 ℃ to 60 ℃, and is not afraid of outdoor temperature differences in all seasons; The internal circuit is equipped with multiple high-voltage isolation protection modules, and the whole machine has passed the power safety certification. It has automatic power-off protection for overvoltage, overcurrent, and arc, ensuring the personal safety of operators throughout the detection of high-voltage photovoltaic strings, fully complying with the national photovoltaic electrical safety operation standards.

The core testing performance is benchmarked against IEC61730 and GB/T14715 photovoltaic electrical testing standards. The insulation resistance test supports multiple high voltage outputs of 500V/1000V/1500V, perfectly adapting to the current mainstream 1500V high voltage photovoltaic string system. The measurement range is 0.01M Ω to 10G Ω, with an accuracy of ± 1%. It can accurately detect insulation damage and leakage hazards inside cables, components, and inverters; Unique bipolar synchronous insulation measurement mode, simultaneously collecting positive and negative pole to ground insulation values, fully evaluating the insulation health status of the entire string in a single test, without the need for separate measurements, doubling the detection efficiency. The grounding resistance test adopts a four wire precise measurement method to eliminate the numerical deviation caused by the resistance of the test cable itself, with a range of 0.01 Ω to 2000 Ω. It accurately verifies the grounding grid of the photovoltaic array, the protective grounding of the equipment shell, and the grounding resistance of the lightning rod, and quickly identifies lightning protection hazards such as grounding electrode corrosion, grounding cable breakage, and excessive grounding resistance; At the same time, the integrated protection conductor conductivity testing function is used to detect the continuity of the grounding of the equipment casing, avoiding electric shock accidents caused by the casing being charged under fault conditions.

The equipment is equipped with an exclusive GFL insulation fault location algorithm, which is a core innovation different from ordinary comprehensive testers. When the insulation resistance value exceeds the standard to determine the leakage of the line, the fault location mode is activated, and the cable is scanned section by section along the string cable, accurately locking the specific fault points of cable damage, junction box water leakage, and internal leakage of components. The operation and maintenance personnel do not need to disassemble and investigate the entire line, greatly reducing the downtime for fault repair and minimizing the loss of power generation. The whole machine is equipped with a 7-inch color touch screen, a fully Chinese visual operation interface, and synchronous display of insulation resistance, grounding resistance, DC voltage, and conduction data on the same screen. The test curve is dynamically drawn in real time, and a dedicated photovoltaic detection program template is built in. The photovoltaic string insulation and grounding standardized detection process can be accessed with one click when starting up, without the need to manually set parameters one by one. Zero based operators can quickly get started.

The data storage and reporting system meets the requirements of project acceptance and compliance archiving. The machine can store 2000 sets of complete detection records with time and geographical location markings locally, each set of records including insulation resistance, grounding resistance, test voltage, and fault determination results; Support one click export of Word and PDF standardized testing reports from USB flash drives. The reports automatically distinguish between qualified/unqualified items, label risk points and improvement suggestions, and are directly used for grid connection acceptance and annual safety testing filing; Simultaneously equipped with RS485 and Bluetooth dual communication interfaces, it can be connected to the power station operation and maintenance management platform, with real-time cloud upload of detection data. Enterprise management personnel can remotely view the entire electrical safety ledger, coordinate hidden danger rectification work, and achieve digital control of electrical safety. The battery life is suitable for all day outdoor testing, with a built-in large capacity rechargeable lithium battery that can continuously complete more than 300 complete insulation grounding tests when fully charged. It supports two types of energy replenishment methods: direct charging from mains power and vehicle charging. Remote photovoltaic fields without power grids are not limited by power supply.

The complete set of standardized accessories includes extended high-voltage insulation test lines, grounding test probes, insulated alligator clips, portable charging adapters, and extended auxiliary cables. All accessories are made of high-voltage resistant insulation materials and are suitable for photovoltaic high-voltage system testing; The device is equipped with an automatic self-test program for the entire machine, which verifies the accuracy of the high-voltage output module and sampling circuit when turned on. The measured values remain stable and do not drift over the long term, reducing annual calibration and maintenance costs.

At present, the LXH601 insulation grounding comprehensive tester has been widely used in EPC grid connection acceptance, third-party power safety testing, annual operation and maintenance inspection of new energy enterprises, and electrical testing scenarios of energy storage power stations. Multiple testing institutions have reported that in the past, completing a complete set of electrical safety testing for a megawatt level photovoltaic power station required carrying three instruments and took a whole day. Using a single LXH601 device can complete all testing projects in half a day, improving fault location efficiency by 80%. The consistency and accuracy of testing data fully meet the acceptance standards, effectively avoiding safety risks such as leakage, lightning strikes, and fires in the photovoltaic system.
Suzhou LAILX is deeply involved in the field of photovoltaic electrical safety testing. The LXH601 insulation grounding comprehensive tester has reconstructed the photovoltaic electrical safety testing operation mode with four core advantages: one machine multi energy, high voltage adaptation, accurate fault location, and portability and durability. The enterprise will continue to upgrade equipment fault location algorithms, expand the adaptation function of energy storage high-voltage systems, improve the matrix of photovoltaic life cycle safety detection equipment, and use domestically produced high-precision comprehensive detection instruments to comprehensively safeguard the electrical operation safety of photovoltaic power plants.

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