Product Introduction
With the rapid development of China's electric power industry, electrical preventive testing has become an essential aspect 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 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 properties—suitable for high-voltage substations, power plants, and similar facilities.
The instrument system integrates the advantages of analog circuits, digital circuits, and mechanical operation, achieving a leading position in output voltage, output current, measuring range, measurement accuracy, and anti-interference capability.
Product Characteristics
1. Strong Anti-Interference Capability: With an anti-electric field interference capability of up to 2mA (50Hz), the instrument is suitable for testing insulation resistance of 500kV large-scale transformers in 500kV substations without the need to disconnect wires.
2. High Short-Circuit Current: The short-circuit current is 10mA, making the instrument ideal for testing high-capacity, high-inductance equipment.
3. Wide Resistance Measurement Range: Covers a range from 0.01MΩ to 1999GΩ with high resolution, ensuring accurate readings.
4. Wide Adjustable Output Voltage Range: Output voltage options include 0.1kV, 0.25kV, 0.5kV, 1kV, 2.5kV, and 5kV, with smooth adjustment from 0V to the desired value.
5. Timing Function: Built-in timing function reminds users to record measurements and supports analysis of absorption ratio and polarization index of the test object.
6. High Quality: Key components are imported to ensure accuracy and reliable performance.
7. Easy to Use: Integrated single-chassis design with compact size and light weight, making it easy to carry and operate.
8. Attractive Appearance: Constructed with rugged, durable materials for enhanced texture and extended service life.
פרמטרים טכניים
| Measurement voltage range | 0.1kV、0.25kV、0.5kV、1kV、2.5kV、5kV |
| Measurement voltage accuracy | ±(5%+10V) |
| Short circuit current | 10mA |
Measurement range and accuracy
| טווח מדידה | Resistance measurement טווח | דיוק |
| 20MΩ | 0.01～19.99MΩ | ±(5%+3ד) |
| 200MΩ | 5.0～199.9MΩ | ±(5%+3ד) |
| 2000MΩ | 50～1999MΩ | ±(5%+3ד) |
| 20GΩ | 0.5～19.99GΩ | ±(5%+3ד) |
| 200GΩ | 5.0～199.9GΩ | ±(10%+3ד) |
| 2000GΩ | 50～1999GΩ | ±(20%+10ד) |
פרמטרים בסיסיים
| Anti-electric field interference ability | 2mA(50/60Hz) |
| פונקציות זמן ואזעקה | 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. |
| לְהַצִיג | three and a half bits LCD digital meter (three), respectively show test voltage, test resistance, test time. |
| ספק כוח | DC: rechargeable lithium battery, DC15V power supply. With AC (50 / 60Hz) special adapter access port to charge the battery. |
| תנאי הפעלה | Temperature：-20℃～+40℃；Relative humidity：20%～90% |
| ממדים | 315×240×180 מ"מ3 |
| מִשׁקָל | 5.5 ק"ג |
Application Scenarios
1. Power equipment installation acceptance
Suitable for insulation testing of power equipment such as transformers, switchgear, instrument transformers, surge arresters, and busbars after installation. By selecting the appropriate test voltage, it verifies whether the equipment meets commissioning requirements and prevents insulation defects from affecting safe system operation.
2. Insulation condition testing of high and low voltage cables
Used for insulation resistance measurement of power cables, control cables, and communication cables. The test voltage can be adjusted according to the cable voltage rating to assess insulation condition of newly laid cables, in-service lines, and cables after maintenance, promptly identifying issues such as moisture ingress, aging, or insulation damage.
3. Motor and generator maintenance and inspection
Suitable for insulation performance testing of AC motors, DC motors, and generator stator and rotor windings. It can determine whether winding insulation meets operational requirements during equipment maintenance, scheduled outage, and before recommissioning, providing a reliable basis for equipment maintenance.
4. Distribution system operation and maintenance
Widely used in routine inspection of factory distribution cabinets, control cabinets, low-voltage distribution systems, and building electrical wiring. By periodically measuring insulation resistance, it promptly identifies leakage hazards and insulation aging issues, improving the safety and reliability of the power supply system.
5. New energy power plant equipment testing
Suitable for insulation testing of photovoltaic modules, combiner boxes, inverters, energy storage systems, and wind farm electrical equipment. It can quickly evaluate the insulation condition of both DC-side and AC-side equipment, ensuring long-term stable operation of new energy systems.
6. Power equipment manufacturing and factory inspection
Used in manufacturing enterprises of motors, cables, transformers, distribution cabinets, and low/high voltage electrical products as an important instrument for product quality inspection. It performs routine testing of insulation performance to ensure compliance with relevant standards and technical specifications.
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FAQs
Q: Why is an adjustable test voltage needed?
A: Different equipment corresponds to different insulation levels, and the required test voltages vary accordingly. For example, low-voltage equipment typically uses 250V or 500V for testing, while medium- and high-voltage equipment requires 1000V, 2500V, or even 5000V tests. An adjustable test voltage can meet the requirements of different standards, preventing inaccurate measurement results or equipment damage caused by improper test voltage selection.
Q: Will the equipment be damaged during the test?
A: No. When the equipment is de-energized and the test voltage is selected in accordance with specifications, insulation resistance testing is a non-destructive test and does not affect normal equipment operation. However, for sensitive devices such as electronic components, PLCs, and frequency converters, they should be disconnected or protective measures should be taken before testing.
Q: How to select the appropriate test range based on the equipment under test?
A: When selecting an instrument, the rated voltage of the equipment, the expected insulation resistance range, and the applicable testing standards should be comprehensively considered. For example, low-voltage distribution equipment typically uses 500V or 1000V testing, while medium- and high-voltage equipment requires higher test voltages and larger measurement ranges. For users who need to test large motors, long-distance cables, or transformers, it is recommended to choose a model with a high measurement range and multiple test voltage levels to meet different application requirements.
Q: Which industries are most suitable for using the adjustable insulation resistance tester?
A: The adjustable insulation resistance tester is widely used in industries such as power systems, industrial manufacturing, rail transit, petrochemical, new energy, power equipment manufacturing, and equipment maintenance. Any scenario involving insulation testing of electrical equipment such as motors, transformers, cables, distribution cabinets, and switchgear can utilize this instrument for installation acceptance, preventive maintenance, and fault diagnosis.
