Введение в продукт
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 Characteristics
1. Strong Anti-Interference Capability: With an anti-electric field interference capability of up to 2 mA (50 Hz), the instrument is suitable for testing insulation resistance of 500 kV large-scale transformers in 500 kV substations without the need to disconnect wires.
2. High Short-Circuit Current: The short-circuit current is 10 mA, making the instrument ideal for testing high-capacity, high-inductance equipment.
3. Wide Resistance Measurement Range: Covers a range from 0.01 MΩ to 1999 GΩ with high resolution, ensuring accurate readings.
4. Wide Adjustable Output Voltage Range: Output voltage options include 0.5 kV, 1 kV, 2.5 kV, 5 kV, 10 kV, and 20 kV, with smooth adjustment from 0 V 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.
Технические характеристики
| Measurement voltage range | 0.5kV、1kV、2.5kV、5kV、10kV、20kV |
| Measurement voltage accuracy | ±(5%+10V) |
| Short circuit current | 10mA |
Measurement range and accuracy
| Диапазон измерений | Resistance measurement диапазон | Точность |
| 20 МОм | 0.01～19.99MΩ | ±(5%+3d) |
| 200 МОм | 5.0～199.9MΩ | ±(5%+3d) |
| 2000 МОм | 50～1999MΩ | ±(5%+3d) |
| 20 ГОм | 0.5～19.99GΩ | ±(5%+3d) |
| 200 ГОм | 5.0～199.9GΩ | ±(10%+3d) |
| 2000ГОм | 50～1999GΩ | ±(20%+10д) |
Основные параметры
| Anti-electric field interference ability | 2 мА (50/60 Гц) |
| Функции времени и будильника | 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. |
| Отображать | three and a half bits LCD digital meter (three), respectively show test voltage, test resistance, test time. |
| Источник питания | DC: rechargeable lithium battery, DC15V power supply. With AC (50 / 60Hz) special adapter access port to charge the battery. |
| Условия эксплуатации | Temperature：-20℃~+40℃；Relative humidity：20%~90% |
| Размеры | 315×240×180 мм3 |
| Масса | 5,5 кг |
Working principle
A high voltage digital tester is composed of medium to large scale integrated circuits. This table has high output power, high short-circuit current value, and multiple output voltage levels (with four voltage levels). The working principle is that the DC high voltage generated by the internal battery as a power source through DC/DC conversion is sent from the E pole to the L pole through the tested object, thereby generating a current from E to the L pole. After I/V conversion and division by a divider, the measured insulation resistance value is directly displayed on the LCD.
Precautions and other matters
1. Pay attention to safety‘ L 'is the high voltage end‘ E 'must be grounded!
2. Check the condition of the instrument. Do not use the method of suddenly connecting it when testing the power supply. Instead, connect the resistor before starting the test power supply, and then press the high voltage switch. Try to avoid sparking and discharging during work! Because high-voltage ignition and discharge can easily damage the integrated circuit components of this instrument, as well as the standard resistors or measured objects used for measurement.
3. The battery charging circuit of the instrument is charged according to the constant voltage current limiting charging method, and it takes about 6-8 hours to fully charge each time. A fully charged battery can provide continuous operation of the instrument for 6-8 hours. To ensure the battery life, the storage period of the instrument should be charged every three months.
4. Battery reassembly method: When the nickel hydrogen battery in the instrument is damaged or has poor power supply performance and needs to be reconfigured, the ten batteries that need to be reconfigured should be tested by a battery capacity tester to prove that the capacity is basically the same. Then, each battery should be fully charged before being installed into the GM megohmmeter.
