On October 25, our test personnel went to Wukang, Huzhou, and cooperated with the owner to complete the 10kV high voltage cable oscillation wave partial amplifier test
Test date: October 25, 2021
Test site: Wukang, Huzhou
Test item: cable oscillation wave partial amplifier test
Test equipment: CT5053 insulation resistance tester, CTMV30 cable oscillation wave partial amplifier test system.
Test process: 1, test preparation 2, cable insulation test 3, cable length measurement 4, local discharge calibration 5, pressurization test 6, cable insulation retest 7, complete the test
Scope of application:
1. For the handover test of power cables: check the hidden dangers that may exist in the process of cable transportation or installation, and ensure the safety and reliability of line operation.
2. Pre-test test for power cable: confirm the quality of the cable terminal head and intermediate connector after maintenance and installation.
3. State diagnosis of running cable: Through the measurement of power cable partial discharge and dielectric loss, the state of the running cable is estimated, and the insulation condition of the cable after a long period of operation is determined, so as to scientifically arrange maintenance, and provide the operation efficiency and reliability of the cable to effectively detect the partial discharge.
4. Various local defects of the cable and accurately locate them
Test site
MV DAC 30 Cable Oscillation Wave Partial Discharge Test System
Cable oscillation wave test device
Product Description:
The DAC30 is a new generation of cable oscillation wave partial discharge test products from Megger Germany (Seba plant in Germany), which consists of a high-voltage unit, a detection device, a control unit and related accessories. The control unit is a laptop, test software and analysis software integrated, all installed in the laptop. The high-voltage unit contains a high-voltage source, a resonant inductor, and a thyristor switch that generates the damped oscillation voltage required for testing. The pressurization test is carried out simultaneously with the automatic analysis of the local discharge, and the results are known after the test is completed. The system adopts power frequency curve technology to ensure test equivalence: voltage rise slope is an important influencing factor of the starting voltage of the local discharge, and the DAC oscillation wave voltage frequency is closer to the 50Hz power frequency, ensuring good equivalence of the test results and power frequency conditions. The "power-like curve technology" effectively controls the curve of the test voltage. The PD level detected under this technique, the PD start voltage, and the PD occurrence frequency and power frequency are directly comparable. Diagnostic tests are performed at frequencies close to the power frequency, and the maximum test voltage can be limited to 1.7Uo or less, reducing further damage to cables and accessories. The analysis and evaluation of typical PDs and the location of PD fault points can provide a reliable basis for the formulation of maintenance and repair plans, and improve the level of grid operation and management.
Basic features:
1. Single partial amplifier calibration, no need to manually calibrate sequentially according to the measuring range;
2. Equipped with professional analysis software, On-Fly measurement at the same time and real-time display of test results;
3. Real-time test real-time results, can automatically analyze the data, consistent with the manual expert analysis results;
4. The database function can uniformly manage the test data and results of the same cable in different periods, which is convenient for comparison;
5. The high-voltage unit and the control unit can be separated and equipped with a frequency reduction device;
6. No high pressure exposure, safe and reliable operation;
7. Split design, the equipment unit weight 25kg +30kg, easy to handle.
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