Product Introduction
With the rapid development of China's electric power industry, electrical preventive testing has become an essential component of the safe operation and maintenance of power systems. Insulation diagnosis plays a critical role in detecting insulation defects or faults in electrical equipment.
Currently, electrical equipment such as transformers and generators is trending toward larger capacity, higher voltage, structural diversification, and improved sealing. This evolution demands insulation resistance testers that offer high output capacity, strong anti-interference capability, and easy portability. In response, we have designed and developed this series of meters specifically for high-interference field testing of large high-voltage transformers, electrical appliances, remote power cables, buried cables, and other electrical insulation resistance applications—suitable for high-voltage substations, power plants, and similar environments.
The instrument system integrates the advantages of analog circuits, digital circuits, and mechanical operation, achieving a leading position in output voltage, output current, measurement range, measurement accuracy, and anti-interference capability.
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Product functions
1. Adjustable test voltage
The instrument supports multiple fixed levels or continuously adjustable DC high-voltage output, allowing users to select the appropriate test voltage based on the rated voltage of the equipment under test and applicable testing standards, thereby improving testing flexibility and application range.
2. High-precision digital measurement
Utilizes a high-performance microprocessor and high-precision sampling circuit to achieve fast and stable insulation resistance measurement, accurately displaying data across a wide range from low resistance to ultra-high resistance values.
3. Large-screen digital display
Equipped with a high-definition LCD screen, displaying parameters such as test voltage, insulation resistance value, test time, and leakage current in real time, making the test process more intuitive.
Technical Parameter
| Measurement voltage range | 0.25kV、0.5kV、1kV、2.5kV、5kV、10kV |
| Measurement voltage accuracy | ±(5%+10V) |
| Short circuit current | 10mA |
Measurement range and accuracy
| Ölçüm aralığı | Resistance measurement menzil | Kesinlik |
| 20MΩ | 0.01～19.99MΩ | ±(%5+3d) |
| 200MΩ | 5.0～199.9MΩ | ±(%5+3d) |
| 2000MΩ | 50～1999MΩ | ±(%5+3d) |
| 20GΩ | 0.5～19.99GΩ | ±(%5+3d) |
| 200GΩ | 5.0～199.9GΩ | ±(%10+3 gün) |
| 2000GΩ | 50～1999GΩ | ±(%20+10d) |
Basic Parameters
| Anti-electric field interference ability | 2mA(50/60Hz) |
| Zaman ve alarm fonksiyonları | maximum value of stopwatch is 19 minutes and 59 seconds. 20 minutes for a cycle. The stopwatch will tell the time at these time points: 15 seconds, 60 seconds and every 60 seconds.When telling time, resistance readings hold for 3 seconds.If the measured resistance is below the lower limit of range, the reading is invalid and the instrument will continuously sound to give an alarm. |
| Görüntülemek | three and a half bits LCD digital meter (three), respectively show test voltage, test resistance, test time. |
| Güç kaynağı | DC: rechargeable lithium battery, DC15V power supply. With AC (50 / 60Hz) special adapter access port to charge the battery. |
| Çalışma koşulları | Temperature:-20℃~+40℃; Relative humidity:20%~90% |
| Boyutlar | 315×240×180mm3 |
| Ağırlık | 5,5 kg |
Ürün Özellikleri
1、With strong anti-electric field interference ability up to 2mA (50Hz), it is suitable for 500kV substation without dismantling wire to test insulation resistance of 500kV large-scale transformer
2、The short-circuit current is 10mA, be suitable for testing high capacity and high inductance
3、Wide resistance range: 0.01MΩ ~ 1999GΩ. With high-resolution, having accurate readings
4、Wide output voltage range: 0.25kV、0.5kV、1kV、2.5kV、5kV、10kV, adjustable, you can smoothly adjust voltage from 0V to the desired value
5、With timing function, remind users to record, and analyze absorptance and polarization index of measured target
6、High quality: The key parts are all imported components, to ensure accuracy and accurate
7、Easy to use: one-piece chassis, small size, light weight, easy to carry
8、Look beautiful: rugged and strong grinding material, the instrument's overall texture and longer life
Application area
Power substation inspection: Used for insulation resistance testing of high-voltage equipment such as transformers, switchgear, instrument transformers, and surge arresters to assess equipment insulation condition.
High-voltage cable testing: Used for insulation performance testing of power cables, cable joints, and terminations to identify moisture ingress, aging, and damage issues.
Motor and generator maintenance: Used for insulation testing of large motor and generator windings to evaluate equipment operational reliability.
New energy equipment testing: Used for insulation testing of high-voltage circuits in photovoltaic, wind power, energy storage systems, and battery equipment to improve system safety.
Electrical equipment production inspection: Used for factory insulation performance testing of high-voltage switchgear, electrical components, transformers, and other products.
Rail transit testing: Used for insulation condition inspection of electrical systems and traction equipment in subway and high-speed rail vehicles.
Industrial equipment maintenance: Used for routine inspection and preventive maintenance of large electrical equipment in factories to reduce failure risks.
Research and laboratory testing: Used for insulation performance research on insulation materials, dielectrics, and new electrical products.
Engineering installation acceptance: Used for insulation quality acceptance after completion of new power engineering and electrical line installations.
Fault diagnosis: Used for rapid identification of insulation degradation, leakage, and potential breakdown hazards in equipment.
FAQs
Q: What is the application value of the adjustable high-voltage digital megohmmeter in high-voltage cable testing?
A: For long-distance power cables, especially high-voltage XLPE cable systems, insulation condition directly affects operational safety. The adjustable high-voltage digital megohmmeter can be used for pre-commissioning acceptance, outage maintenance testing, and routine operation and maintenance inspections of cables. By measuring insulation resistance, it can identify potential issues such as moisture ingress, aging, and insulation degradation in cables, helping to reduce the risk of operational failures.
Q: Can the adjustable high-voltage digital megohmmeter be used for preventive maintenance?
A: Yes. During long-term operation of electrical equipment, insulation materials are gradually affected by factors such as temperature, humidity, and electrical stress, leading to aging. By regularly using the adjustable high-voltage digital megohmmeter for insulation testing, the trend of insulation performance degradation can be identified in advance, providing a basis for equipment maintenance, replacement, and operation management.
Q: Why choose an adjustable high-voltage digital megohmmeter instead of a standard megohmmeter?
A: The adjustable high-voltage digital megohmmeter offers advantages such as a wider test voltage range, higher measurement accuracy, greater automation, and more comprehensive safety protection. It can meet the professional insulation testing requirements of equipment at different voltage levels, making it more suitable for power, industrial, and engineering application scenarios.
Q: Why is adjustable test voltage required for insulation testing of high-voltage equipment?
A: Electrical equipment of different voltage levels and structures has different requirements for insulation testing conditions. The adjustable high-voltage digital megohmmeter can select the appropriate test voltage based on the rated voltage of the equipment under test, applicable testing standards, and on-site requirements, avoiding the application limitations of fixed-voltage testing and improving the accuracy and reliability of test results.
