The KDDAC-30 cable oscillating wave partial discharge detection and positioning system generates a local discharge AC voltage of up to 30kV during the test process, and combines the new system hardware and system software for diagnosis, mainly including:
u Intelligent booster unit with high pressure;
u oscillation inductance;
u partial voltage unit/local discharge coupling unit;
u local amplifier signal filtering unit;
u high voltage switch unit;
u embedded control panel unit;
u dielectric loss measuring unit;
u newer semiconductor technology;
u Newer laser control technology;
u new digital signal processor and filtering technology;
New wireless network control technology.

1. The local discharge oscillator unit is an integrated design, including high voltage coil, high voltage divider, high voltage switch, local discharge coupling capacitor, coupling unit and local discharge detector.
2. The measurement and control host coordinates the operation of the system, communicates with the local discharge oscillator unit through the wireless network, controls the operation of the local discharge oscillator unit, and collects, stores and analyzes the local discharge oscillator signal and the local discharge signal collected by the voltage divider/coupler.
3. With office discharge measurement and positioning function: 2nC-1000pC
4. With frequency domain filtering function
5. With wavelet filtering function
6. Withstand pressure test function in line with international standards
7. Display the current discharge level and trend of the withstand voltage test
8. Calibration waveform reference function during analysis
9. Revise the office release analysis results at any time
10. Automatically calibrate cable length, joint position and wave speed
11. It has the ability to measure the initial voltage, extinguishment voltage and level of local discharge
12. Locate multiple office release defects at the same time
13. Automatically measure the cable capacity
14. Automatic measurement of cable dielectric loss tanδ
15. Automatically adjust the frequency band width according to the cable length to get a better reflection waveform
16. The charging time does not exceed 2 seconds, the test time is less than 100ms, non-destructive test
17. With compensation function, truly restore the actual size of the office volume
18. With hybrid cable wave speed error correction function
19. Automatic and manual analysis functions
20. Cable length correction function
21. Emergency shutdown function and safety control loop

Power supply 220VAC±10%, 50Hz
The maximum output voltage of the oscillation wave is 30kV
The oscillation frequency ranges from 20Hz to 300Hz
The test cable length ranges from 200m to 20km
High voltage charging current 5mA
High voltage switch trigger mode: laser triggers the high voltage switch
High voltage switch control turn-on time: 1µs
Switching resistance: less than 1Ω
Optical fiber communication
The measurement range of office discharge ranges from 1pC to 100nC
Local discharge level detection and bandwidth comply with the International Electrotechnical Commission IEC60270 standard
The positioning bandwidth of the local discharge ranges from 150kHz to 45MHz
Local release positioning measurement accuracy Cable length 1% (minimum resolution 2m)
Dielectric loss measurement range 0.1 %~10 %
The real-time sampling rate of the local release is 100MHz
Local sampling storage depth 32MB(can record 300ms data length)
Control mode Wireless control
Local discharge calibration mode automatic/manual