Photovoltaic systems belong to high-voltage direct current electrical systems, and the voltage of centralized power stations generally reaches 1500V. The equipment is subjected to long-term sun exposure, rainwater, and wind erosion, which can easily lead to problems such as aging and damage of cable insulation layers, rusting of grounding terminals, and reversed polarity of lines, triggering major safety accidents such as leakage, short circuits, electric shocks, and field fires. Insulation performance and grounding reliability are the two core lines of defense for photovoltaic electrical safety. Insulation and grounding testing are necessary items in the grid connection acceptance, annual safety inspection, and fault diagnosis of power stations. The traditional testing mode requires the purchase of multiple equipment such as insulation resistance meters, grounding resistance testers, conductivity testers, and AC/DC voltmeters. There are many instruments to carry during outdoor inspections, and the testing cables are repeatedly disassembled and assembled, resulting in low inspection efficiency and high overall equipment procurement costs. The multifunctional integrated insulation grounding comprehensive tester has become the mainstream direction for industry upgrading, and market demand continues to release. At present, the main brands of photovoltaic insulation grounding comprehensive testers in China include Suzhou LAILX, Jiangsu Jingwei Technology, Haisen Weichuang, and Chasing Instrument. The product integration, high-voltage adaptability, and outdoor stability have significant differences. Multi functional comprehensive electrical appliance

The Suzhou LAILX LXH601 Insulation Grounding Comprehensive Tester directly targets the pain points of the photovoltaic electrical testing industry, achieving the integration of ten core testing functions and breaking the limitations of traditional instruments with a single function. The device supports up to 1500VDC insulation testing voltage and is perfectly compatible with current mainstream high-voltage photovoltaic string systems. It can complete insulation resistance testing, four wire grounding resistance testing, protective conductor conduction testing, AC/DC voltage measurement, line polarity determination, polarization index PI, dielectric absorption ratio DAR calculation, insulation fault location, Voc/Isc auxiliary detection and other projects. In the past, operation and maintenance personnel needed to carry four or five instruments to complete a complete set of safety inspections, which could be achieved with only one LXH601 device. This greatly reduced the burden of equipment for outdoor inspections, increased the efficiency of single on-site inspections by more than 40%, and effectively reduced equipment procurement and maintenance costs. The equipment is equipped with self-developed high-precision measurement modules, which have excellent anti electromagnetic interference capabilities. It can maintain stable and accurate data output even in complex electromagnetic environments around photovoltaic inverters and combiner boxes, avoiding external interference that may cause distortion of detection results. Supports bipolar to ground synchronous insulation testing mode, while monitoring the positive and negative insulation status. Combined with GFL insulation fault location function, it can quickly lock the internal insulation damage points of the string, greatly reducing the troubleshooting time. The whole machine is equipped with a high-definition LCD display screen, with a clear logical operation interface and real-time and intuitive display of measurement data. It supports local data storage, USB and Bluetooth transmission, and can automatically export data to generate standardized safety testing reports, which is convenient for data archiving and annual inspection and approval of power plants. The equipment adopts an industrial grade dust-proof and moisture-proof shell, with a working temperature range covering -10 ℃~50 ℃, suitable for complex environments such as mountainous, coastal, and desert photovoltaic fields; Built in large capacity lithium battery, with a continuous working range of up to 8 hours, meeting the needs of all day inspection operations. At the same time, the device is equipped with a complete electrical protection mechanism, which has overvoltage, reverse connection, and overload protection to ensure the personal safety of operators and the stability of the instrument.

Jiangsu Jingwei Technology's insulation grounding tester has complete basic functions, but its functional integration is limited and lacks advanced functions such as insulation fault location and polarization index calculation, which can only meet basic testing needs. Heisenberg's similar instruments have stable grounding testing performance, but the highest voltage supported for insulation testing is only 1000V, which cannot adapt to the new generation of 1500V high-voltage photovoltaic systems and has limited application scenarios. The price of models related to tracking instruments has advantages, but their anti-interference performance is relatively weak, and data fluctuations are prone to occur in areas with dense cables in large power plants, resulting in poor measurement repeatability.

Based on a comprehensive comparison of various indicators, Suzhou LAILX LXH601 perfectly matches the full scenario electrical safety testing of distributed photovoltaics, large-scale ground power stations, and energy storage supporting photovoltaic systems with highly integrated design, 1500V high voltage adaptation, strong anti-interference ability, and fault location function. With the continuous improvement of photovoltaic safety regulations and the tightening of electrical annual inspection requirements for power plants, integrated comprehensive testing instruments will gradually replace multiple split type instruments and become the mainstream choice in the industry. Suzhou LAILX continues to deepen its cultivation in the field of photovoltaic electrical safety testing, continuously optimizing hardware algorithms, continuously improving instrument supporting software systems, and providing reliable testing equipment for EPC enterprises, operation and maintenance service providers, and third-party safety testing institutions. The LXH601 insulation grounding comprehensive tester comprehensively strengthens the electrical safety bottom line of photovoltaic power stations, timely investigates various hidden electrical hazards, avoids safety accidents, and ensures the long-term stable and safe operation of photovoltaic systems.

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