Photovoltaic power plants operate outdoors for a long time, and their component cables, junction boxes, combiner boxes, and inverters are easily affected by sunlight, rain, dust, and aging, which can lead to insulation layer damage and leakage hazards. This can cause continuous loss of power generation, and in severe cases, lead to DC arcs and fire safety accidents. According to the IEC62446 photovoltaic safety testing standard, insulation resistance testing is a mandatory testing item for power station grid connection acceptance, annual operation and maintenance, and fault diagnosis. Traditional insulation testers must be powered off and short circuited in series to measure, making it impossible to operate during daytime power generation periods, significantly increasing the maintenance period; Ordinary equipment has insufficient measuring range, lacks dedicated photovoltaic measurement modes, has large measurement errors in high-voltage string, and poses a risk of electric shock. Jiangsu Jingwei Technology has developed the JW-J25 photovoltaic specific insulation resistance tester, which supports online detection of photovoltaic live lines, wide range high-voltage adaptation, multiple safety protections, portable intelligent operation, and one-stop solution for insulation safety testing of photovoltaic systems. Multi functional comprehensive electrical appliance
The JW-J25 is equipped with a photovoltaic exclusive PV insulation measurement mode, and its core breakthrough lies in the fact that there is no need for power station shutdown or short circuiting of photovoltaic strings. Under normal power generation conditions during the day, positive and negative pole to ground insulation resistance detection can be completed, completely breaking the limitation of traditional equipment that can only be stopped at night for detection. Operation and maintenance personnel can use daytime inspection to synchronously complete insulation investigation, and the detection efficiency is more than doubled. The equipment provides two standard test voltages of 500V and 1000V, perfectly adapting to the current mainstream 1000V and 1500V high-voltage photovoltaic string. The insulation resistance measurement range covers 10k Ω to 10T Ω, and can accurately capture small insulation degradation and local leakage. It can warn of insulation damage hazards in advance and prevent fire risks from the source. The response speed of the whole machine measurement is fast, and a single complete insulation detection only takes 4 seconds, saving time and effort in batch string detection.
Safety protection is the core design focus of JW-J25, and the equipment is equipped with multiple high-voltage protection mechanisms: real-time sound and light high-voltage warning during the testing process, automatic rapid discharge at the end of the test, and elimination of residual high-voltage electric shock risks; Built in anti reverse connection, overvoltage, and overcurrent protection, accidental connection of positive and negative poles, and over range voltage connection will not damage the instrument, while protecting the personal safety of operation and maintenance personnel; The whole machine has passed the CAT III 2000V high-voltage safety certification, fully meeting the safety inspection standards for large-scale high-voltage photovoltaic stations. Equipped with extended insulation remote control test probes as standard, operators can remotely start and stop the test without touching the high-voltage terminal blocks up close, further reducing safety hazards in outdoor high-voltage operations.
The operation and portability design are in line with frontline operation and maintenance. The whole machine body is compact and lightweight, with an anti slip structure for handheld operation. It is easy to handle with one hand without burden, and comes with a hard portable tool kit that can store a complete set of probes and accessories, making it convenient to carry to roofs, brackets, and junction boxes. Large screen digital analog dual display screen, synchronously displaying real-time insulation resistance, test voltage, and tested circuit DC voltage, with intuitive and clear numerical values; Full Chinese function buttons, one click switching between PV photovoltaic mode, normal insulation mode, and voltage measurement mode, supporting timed measurement and data comparison alarm functions. When the insulation resistance value is below the safety threshold, automatic sound and light reminders are provided, and operation and maintenance personnel can quickly locate the fault string. The device is equipped with a large capacity rechargeable lithium battery, which can be continuously tested for 12 hours when fully charged, without the need for frequent battery replacement, and is suitable for all day outdoor operation and maintenance work.
The equipment has complete data storage and export capabilities, and can store 1000 sets of insulation testing records locally. Each set of data synchronously records the test voltage, insulation resistance value, testing time, and circuit voltage. It supports USB data export and is equipped with computer management software to automatically generate insulation testing ledger reports, fully retain safety testing records, and meet the requirements of grid connection acceptance, power station safety annual inspection, and safety production supervision data archiving. In addition to photovoltaic insulation testing, the equipment can also measure AC/DC voltage and insulation of ordinary electrical equipment, taking into account the safety testing of power station cables, energy storage equipment, and distribution equipment. It can be used for multiple purposes to reduce equipment procurement costs.
At present, JW-J25 has been widely used in the safe operation and maintenance of domestic ground photovoltaic bases, industrial and commercial distributed systems, and energy storage supporting photovoltaic projects. According to data from the operation and maintenance department of a certain new energy group, after using the JW-J25 live detection function, the insulation detection of the entire station does not need to be stopped, reducing power generation losses by hundreds of thousands of kilowatt hours annually; The equipment accurately identifies multiple hidden dangers such as insulation aging of junction boxes and cable skin breakage and leakage, and proactively rectifies and eliminates fire risks, significantly reducing the incidence of power station safety accidents.
Electrical insulation safety is the bottom line for the long-term stable operation of photovoltaic power plants. Jiangsu Jingwei JW-J25 insulation resistance tester innovates the photovoltaic safety detection mode with the core technology of live online detection. In the future, enterprises will continue to upgrade equipment functions, expand Bluetooth wireless data upload and cloud security ledger management functions, and form a complete photovoltaic safety performance testing set with IV, EL, and irradiation instruments. With domestically produced safety testing equipment, they will build a comprehensive electrical safety protection system for photovoltaic power plants nationwide.
Multi functional comprehensive electrical appliance, safety comprehensive tester, photovoltaic grounding impedance tester
