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.
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 | 0.5kV、1kV、2.5kV、5kV、10kV、15KV |
| 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: 0.5kV、1kV、2.5kV、5kV、10kV、15KV, 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 Scenarios
High-voltage cable insulation testing
— Used for acceptance testing, maintenance testing, and operational condition assessment of power cables, detecting cable insulation resistance, leakage current, and insulation aging.
Power transformer insulation testing
— Used during transformer installation, maintenance, and overhaul to test winding-to-ground and inter-winding insulation performance, identifying issues such as moisture ingress and aging.
High-voltage motor and generator testing
— Used for insulation condition testing of large motor and generator windings, evaluating insulation performance, and supporting equipment maintenance and fault prevention.
Substation primary equipment maintenance
— Used for insulation testing of high-voltage switchgear, circuit breakers, instrument transformers, and other equipment, performing preventive testing and operational condition assessment.
New energy power plant equipment testing
— Used for insulation condition inspection of step-up transformers, cables, and high-voltage equipment in wind power, photovoltaic, energy storage, and other power plants.
Industrial high-voltage equipment maintenance
— Used for periodic insulation testing of high-voltage cables, motors, transformers, and other equipment in industries such as petrochemical, steel, mining, and cement.
Equipment installation and overhaul acceptance
— Used for insulation performance verification before commissioning of new equipment, after equipment retrofitting, or upon completion of maintenance work.
FAQs
Q: What is an adjustable high-voltage digital megohmmeter, and what scenarios is it mainly used for?
A: An adjustable high-voltage digital megohmmeter is a testing instrument used to measure insulation resistance and assess the insulation condition of electrical equipment. It outputs an adjustable DC high voltage to the equipment under test, measures the leakage current, and calculates the insulation resistance value.
It is primarily used for insulation testing of power cables, transformers, motors, generators, high-voltage switchgear, and other equipment, for applications such as equipment acceptance, preventive maintenance, and fault diagnosis.
Q: Can the adjustable high-voltage digital megohmmeter replace withstand voltage test equipment?
A: It cannot completely replace it.
The adjustable high-voltage digital megohmmeter is primarily used for insulation resistance measurement and insulation condition diagnosis, determining whether the insulation performance of the equipment is satisfactory. On the other hand, AC withstand voltage testing, partial discharge testing, and other types of high-voltage tests fall into different categories and require specialized test equipment.
Q: Will testing in humid environments affect the results?
A: Yes.
When humidity is high, leakage paths may form on the surface of the equipment, which can reduce the measured insulation resistance.
Therefore, the following should be observed during on-site testing:
Keep the equipment surface dry and clean;
Record ambient temperature and humidity;
Make a comprehensive judgment based on historical data.
