The photovoltaic system belongs to the high-voltage direct current electrical system. After the popularization of 1500V high-voltage string, the risk of electrical faults such as cable insulation damage, junction box water leakage and moisture, bracket grounding corrosion and virtual connection, and combiner box leakage has significantly increased. According to the IEC61730 photovoltaic module safety standard, power station completion acceptance specifications, and annual operation and maintenance testing requirements, multiple safety inspections such as insulation resistance, grounding continuity, withstand voltage, and open circuit short-circuit voltage are mandatory verification items. The traditional detection mode requires multiple devices such as insulation shake meters, grounding resistance testers, and voltage and current meters, which are cumbersome to carry and require repeated disassembly and wiring, resulting in low inspection efficiency. In addition, ordinary equipment has weak anti-interference ability, and high-voltage system measurement errors are large, making it difficult to accurately locate insulation fault points. Suzhou Laikesi New Energy Technology (LAILX) has directly targeted the pain points of the photovoltaic electrical testing industry. It has independently developed the LXH601 insulation and grounding comprehensive tester, which integrates more than ten detection functions including insulation, grounding, withstand voltage, voltage and current, and fault location. One device covers the full dimensional electrical safety verification of photovoltaic systems, with an integrated portable design, four wire high-precision measurement, and 1500V wide range adaptation. It has become a standard comprehensive safety equipment for photovoltaic engineering acceptance, annual operation and maintenance, and third-party safety testing. DC withstand voltage, insulation impedance, grounding resistance, leakage current

Multi functional integration is the core innovation highlight of LXH601, completely solving the tedious problem of carrying multiple devices for work. The whole machine integrates seven core testing modules, including insulation resistance testing, four wire grounding resistance testing, AC/DC withstand voltage testing, open circuit voltage Voc, short-circuit current Isc testing, positive and negative pole to ground dual insulation synchronous testing, and insulation fault location function. It does not require instrument replacement or rewiring, and can complete the entire safety inspection in a single installation. The comprehensive efficiency of single person inspection is improved by more than 40%. The insulation resistance test is set with three levels of high voltage output: 500V/1000V/1500V, which perfectly matches the testing standards of different withstand voltage levels of components, strings, and inverters. The maximum measurement range can reach 100G Ω. The ultra large insulation resistance can accurately identify subtle insulation aging, cable skin breakage, junction box moisture and other insulation defects, quantify the degree of insulation attenuation, and predict the risk of leakage faults. The unique DUAL bipolar detection mode can synchronously measure the insulation values of the positive pole to ground and negative pole to ground of the photovoltaic circuit, comprehensively evaluate the insulation balance state of the system, and avoid hidden ground leakage hazards missed in unipolar detection.

The grounding resistance measurement adopts industry-leading four wire precision measurement technology, completely eliminating the data interference caused by the resistance of the test leads. The measurement range covers 0m Ω to 2000m Ω, with a minimum resolution of 0.1m Ω. It accurately detects the grounding continuity of photovoltaic metal brackets, combiner box shells, lightning protection grounding strips, inverter cabinet bodies, and quickly identifies hidden dangers such as grounding corrosion, bolt loosening, and grounding strip breakage. The equipment grounding conductivity test can determine whether the grounding circuit resistance meets the photovoltaic lightning protection safety regulations. When the grounding resistance exceeds the standard, the equipment will sound and light an alarm, prompting operation and maintenance personnel to reinforce and rectify in a timely manner to avoid lightning strikes and electric shock safety accidents. The AC/DC withstand voltage module supports a maximum output of 1500V DC withstand voltage, and can complete destructive sampling of insulation withstand voltage of components and inverters, verify the maximum protection ability of the equipment insulation layer, and meet the compliance requirements of component factory and power station entry quality inspection.

The precise fault location function significantly reduces the downtime for fault diagnosis. Traditional insulation equipment can only determine whether the overall insulation meets the standard, and cannot locate faulty branches or components. Operation and maintenance personnel need to disconnect and retest one by one, which consumes a lot of manpower and time. The LXH601 is equipped with a self-developed insulation fault location algorithm. When abnormal insulation resistance is detected, the fault can be locked step by step in the string or branch, accurately reducing the fault range. Operations personnel can carry out targeted maintenance, greatly reducing the duration of power station shutdown detection and minimizing power generation losses. The device synchronously collects the open circuit voltage and short-circuit current values of the string in real time, and combines insulation and grounding detection data to comprehensively determine the root cause of system faults, distinguish between insulation faults, grounding failures, and component power attenuation, and provide integrated fault diagnosis conclusions.

The whole machine hardware is adapted to complex outdoor high-voltage photovoltaic operation scenarios, with industry-leading measurement accuracy and anti-interference ability. The device is equipped with multiple hardware filtering circuits, which are specially optimized for electromagnetic interference generated by photovoltaic power plant frequency converters and inverters. The measurement data is stable and drift free in strong electromagnetic environments, avoiding misjudgment caused by high voltage power plant clutter interference. The working temperature range of the whole machine is -10 ℃ to 50 ℃, and the measurement accuracy of high and low temperature environments is not affected. It is suitable for power stations in various regions such as northwest cold and southern high temperature and high humidity. The operation interface adopts high-definition digital display screen, large font display of numerical values, clear and readable outdoors under strong light, bilingual operation menu in Chinese and English, simple and intuitive parameter settings, built-in preset program for photovoltaic standard detection process, and operators can easily call the standardized detection template with one click without manually setting the range, duration, and voltage parameters. Zero basic personnel can quickly get started with the operation. The device stores tens of thousands of complete detection data locally, and each set of data synchronously records insulation, grounding, voltage, time, and device number. It supports local review and batch export, making it easy to track the trend of electrical safety status changes in the system for a long time.

Portable and secure design suitable for on-site mobile inspection needs. The whole machine adopts a compact waterproof and shockproof protective box integrated packaging, with a small and lightweight volume. It can be carried by a single person to work on rooftops, mountains, and water power stations; The complete set of testing cables, grounding probes, and high-voltage testing clips are stored inside the box, and the accessories are not easily lost. The device is equipped with a rechargeable lithium battery, which supports continuous testing throughout the day when fully charged. Remote power stations without mains electricity do not require external power supply, and come with a fast charging interface. The emergency power bank can quickly replenish power. The whole machine has multiple safety protection mechanisms, and the high-voltage output port is equipped with locking protection, which automatically cuts off the high-voltage output when accidentally touched; Real time hardware protection for overvoltage, overcurrent, leakage, and reverse connection. In case of any abnormalities during the detection process, an immediate sound and light alarm will be triggered and the circuit will be cut off to prevent high-voltage electric shock and instrument burnout safety accidents. This fully complies with the IEC62446 photovoltaic electrical testing safety regulations.

Supporting PC management software to achieve digital archiving of detection data and automatic generation of reports. The software can import the detection records stored in the equipment in batches, automatically count the fault points with insulation failure and grounding exceeding the standard, generate power station electrical safety analysis reports, and visually present the overall safety status of the system; One click export of standardized safety inspection report, including all test values, judgment conclusions, and rectification suggestions. The file format is compatible with PDF and Excel, meeting the requirements of power grid acceptance, owner operation and maintenance, and third-party inspection agency archiving compliance. The software has a built-in long-term data comparison function, which can retrieve detection data from previous years and the same period, compare changes in insulation and grounding parameters, predict the electrical aging rate of the system, and develop targeted operation and maintenance plans.
At present, the LXH601 insulation grounding comprehensive tester has been widely used in domestic new energy group operation and maintenance centers, provincial power quality inspection units, photovoltaic EPC construction enterprises, and third-party safety testing institutions, covering all types of projects including ground centralized, industrial and commercial distributed, and household photovoltaic. Market feedback shows that the integration advantage of one machine with multiple functions significantly reduces the cost of purchasing and carrying operation and maintenance instruments, and the precise fault location function significantly shortens the fault maintenance period. The comprehensive use cost is reduced by more than half compared to multiple separate devices.

With the widespread adoption of 1500V high-voltage photovoltaic systems, electrical safety testing has become a core requirement for power station operation and maintenance. Integrated, high-precision, and intelligent comprehensive safety equipment is the mainstream direction of industry development. Relying on independent measurement algorithms and hardware research and development capabilities, Suzhou LAILX fills the gap in the high-end market of domestic photovoltaic comprehensive safety testing equipment with LXH601, providing a one-stop electrical safety testing solution for the photovoltaic industry chain. In the future, Lexus will continue to upgrade its fault location algorithms, collaborate with IV, EL, and thermal imaging equipment to create an integrated photovoltaic detection system, and comprehensively safeguard the electrical safety and stable operation of photovoltaic power plants.

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