English
- Core Description
The dielectric loss tester adopts variable frequency power supply technology, single chip microcomputer and modern technology for automatic frequency conversion, analog-to-digital conversion and data operation; It has strong anti-interference ability, fast test speed, high precision, automatic digitization and simple operation; The power supply adopts high-power switching power supply, which can provide a maximum voltage of 10kV; It can automatically filter out 50Hz interference and is suitable for on-site test with large electromagnetic interference such as substation. It is widely used for dielectric loss measurement of transformers, mutual inductors, bushings, capacitors, arresters and other equipment in power industry.
Introduction
1. The instrument adopts Fourier transform digital filtering technology to measure capacitance, dielectric loss and other parameters. The test results have high precision and are easy to realize automatic measurement.
2. The instrument adopts frequency conversion technology to eliminate 50Hz power frequency interference on site, and can measure reliable data even in the environment of strong electromagnetic interference.
3. Data storage: it is internally equipped with calendar chip and large capacity memory, which can save the test results at any time, view the historical records at any time, and print out.
4. Instrument data can be exported through USB flash disk.
5. Integrated model with standard capacitor and high voltage power supply, which is convenient for field test and reduces field wiring.
6. It has the function of reverse wiring low-voltage shielding. Under the condition of 220kV CVT bus grounding, the dielectric loss of C11 can be measured without disconnecting 10kV reverse wiring.
7. It can identify the frequency of external high-voltage power supply from 40Hz to 70Hz, and it is allowed to use power frequency power supply or series resonant power supply for large capacity and high-voltage dielectric loss test.
8. With CVT test function, it can realize CVT self excitation test, and can set four protection limits of high voltage / current and low voltage / current to ensure personal and equipment safety.
9. When testing CVT, it can not only automatically test the capacitance and dielectric loss of C1 and C2, but also test the total capacitance and dielectric loss of CVT equipment.
10. With a thermal printer.
11. With computer interface. One computer can control 32 instruments, which can be integrated into the comprehensive high voltage test vehicle to realize measurement, data processing and report output.
12. Grounding protection function, electric shock protection function.
Accuracy | Cx | ± (reading) × 1%+1pF） |
tg δ | ± (reading) × 1%+0.00040） | |
Anti interference index | frequency conversion anti-interference, which can still achieve the above accuracy under 200% interference | |
Capacitance range | Internally applied high pressure | 3pF～60000pF/10kV 60pF～1 μ F/0.5kV |
Externally applied high voltage | 3pF～1.5 μ F/10kV 60pF～30 μ F/0.5kV | |
resolving power | Up to 0.001pf, 4 significant digits | |
tg δ Range | Unlimited, resolution 0.001%, automatic identification of capacitance, inductance and resistance. | |
Test current range | 10 μ A～5A | |
Internally applied high pressure | Set voltage range | 0.5 ~ 10KV |
Maximum output current | 200mA | |
Voltage rise and fall mode | the voltage is set at will. For example, 5123v. | |
Test frequency | 40-70HZ, single frequency set at will. For example, 48.7hz | |
Automatic double frequency conversion from 50 ± 0.1Hz to 50 ± 10Hz can be set at will. | ||
Automatic double frequency conversion from 60 ± 0.1Hz to 60 ± 10Hz can be set at will. | ||
Frequency accurac | ±0.01Hz | |
Externally applied high voltage | The maximum test current during positive connection is 5a, power frequency or frequency conversion is 40-70HZ | |
The maximum test current during reverse wiring is 10kV / 5A, power frequency or frequency conversion is 40-70HZ | ||
CVT self excitation low voltage output | output voltage 3 ~ 50V, output current 3 ~ 30A | |
Measurement time | About 40s, related to the measurement method | |
Input power supply | 180V ~ 270vac, 50Hz ± 1%, mains power or generator power supply | |
Computer interface | standard RS232 interface, USB flash disk socket (automatic USB flash disk data storage). | |
Printer | micro thermal printer | |
ambient temperature | – 10 ℃ ~ 50 ℃ | |
relative humidity | < 90% | |
Overall dimension | 460 × 360× 350mm | |
instrument weight | 28KG | |
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