High Voltage Diagnostics Sarl 4, Rue de Lac CH 1897 Le Bouveret Switzerland

Transcription

1 High Voltage Diagnostics Sarl 4, Rue de Lac CH 1897 Le Bouveret Switzerland

2 Company HV Diagnostics Sarl is a Swiss based company in the field of high voltage test equipment for cable testing and diagnosis.

3 Company Factory in A AUSTRIA SWITZERLAND Office CH

4 Products Universal High Voltage Test System HVA-Series Tan Delta Test System TD-Series Partial Discharge Detection and Location for MV Cables PD-Series

5 WhyVLFCabelTesting? Space charges that can occur under elevated DC voltages. Water trees can result in localized stress enhancements. Reapplication of normal AC power: Water tree sites can ultimately lead to an electrical tree or trees. Once an electrical tree has been initiated, complete cable failure is normally imminent and inevitable. A single water tree which converts to an electrical tree is causing a cable to fail!

6 WhyVLFCabelTesting? D.C. Testing of XLPE will only find gross defects. Diagnostic testing like Tan Delta or Partial Discharge is not possible with D.C. D.C. only tests the resistive component (R) or conductance in a cable.

7 WhyVLFCabelTesting? Whynearlyno50Hz-Tests? P = L (ω.c) U2 P = L (2.PHI.freq.C) U2 = 1 (2 * 3.14 * 50 * 0.33) 142 = 20 kva VPE-Cabel 14kV Test 1000m 95mm2 (C = 330nF/km typicalcabel) Result: Too Heavy, too expensive

8 VLF Testing Standards IEEE 400 & IEEE 400:2 Revised2001(USA) IEC (Europe& International) CENERLEC HD 620 & 621 (Europe& International) VDE 0276 Part 620 SANS (South Africa) NEN3620/C1 ( Nederland)

9 VLF Testing VLF 0,1Hz VoltageTestingaccordingDIN VDE 0276 (HD 620 S1) Cable PVC and PILC VPE (XLPE/PE) Test Voltage Voltage Time DC 5,6 8 U min AC Hz 2 U 0 30 min AC 0,1 Hz 3 U 0 30 min AC Hz 2 U 0 60 min AC 0,1 Hz 3 U 0 60 min

10 VLF Testing Advantage Disadvantage Sinusoidal Waveform Stresses both resistivity R and impedance R, L and C Higher breakdown strength than 50Hz Tan Delta measurements possible Partial discharge measurements possible Stress lines similar to 50Hz on cable, terminations & joints. Sinusoidal is symmetrical under any load (electronically generated) not 50Hz but 0.1Hz

11 HVA 30 Universal High Voltage Test System Output Voltage Sinusoidal: 0-33 kvpeak, 23kV RMS DC ±: 0-30 kv(bothpolarities) Square-Wave: 0-30kV Output Current 15mA Frequency 0,01Hz to0,1hz Load 23kV RMS 12µF Maximum Capacitance!

12 HVA 30 Universal High Voltage Test System Auto Frequency Selection AC (VLF) Symmetrical and load independent across full range Fast Trip Out and Fault Conditioning Burn Modes Programmable Fully Automatic Test Sequences Less than 20kg

13 HVA 30 Universal High Voltage Test System Battery(optional) Build-in 12kV Feedback Protection! PC Software HVA Control Center No thermal limitation for operating time Less maintainance no oil used

14 HVA 30-5 Ultra High Power Universal High Voltage Test System Output Voltage Sinusoidal: 0-33 kvpeak, 23kV RMS DC ±: 0-30 kv(bothpolarities) Square-Wave: 0-30kV Output Current 85mA Frequency 0,01Hz to0,1hz Load 19kV RMS 15µF Maximum Capacitance

15 HVA 60 Universal High Voltage Test System Output Voltage Sinusoidal: 0-62 kvpeak, 44kV RMS DC ±: 0-60 kv(bothpolarities) Square-Wave: 0-60kV Output Current 37mA Frequency 0,01Hz to0,1hz Load 44kV RMS 44kV RMS 15µF Maximum Capacitance

16 HVA 90 Universal High Voltage Test System Output Voltage Sinusoidal: 0-90 kvpeak, 64kV RMS DC ±: 0-90 kv(bothpolarities) Square-Wave: 0-90kV Output Current 40mA Frequency 0,01Hz to0,1hz Load 64kV RMS 64kV RMS 11µF Maximum Capacitance

17 HVA Series The load independent, symmetrical output waveform avoids the potentially destructive space charge effects caused by DC polarization that occurs in aged extruded cables such as XLPE / PE / EPR. The instrument automatically calculates the optimum frequency to energize larger loads (longer cables). The instrument is easily programmable allowing the operator to setup or select test sequences in either automatic or manual mode.

18 HVA Series I Capacitive I C I TOTAL I R V (applied) The HVA measures the real time output wave and digitize the information (Digital Signal Processor). Therefore it is possible to measure not only the RMS leakage current but also the Capacitive current (capacitance is displayed) AND the resistive current (Megohm reading).

19 Example: HVA60 Output Load HVA Series kV RMS (Approx 3 km of cable) kV RMS (Approx 6 km of cable) kV RMS (Approx 15 km of cable) Maximum Capacitance 10µF Based on a typical cable: 330nF/km Length (km) = P /(2. π. F. C(µF/km). V 2 ) P 2 π F (Hz) C (µf/km) V 2 (kv) L (km)= 1216,34 2 3,1416 0,1 0, , km

20 HVA Series Applications Cables: XLPE, PE, EPR, PILC etc. such as IEEE 400.2, VDE 0276, CENELEC HD 620 S1, the present draft of IEC , etc. Capacitors Switchgear Transformers Rotating Machines (IEEE 433) Insulators Bushings

21 DIAGNOSTICS TAN DELTA Test System Easy method to diagnose the condition of the cable isolation Non destructive method A method to diagnose Water Trees Preventive maintenance scheduling of repair and replacement Preventivemaintenance

22 DIAGNOSTICS TAN DELTA Test System A cable is a large capacitor. I C is very large I R is very small TD = Tan Delta ( δ ) = True Power Capacitive Reactive Power = U2/R U2 C = 1 CR XLPE = 1.2 x 10-3 PILC = 50 X 10-3

23 DIAGNOSTICS TAN DELTA Test System Conventional System:

24 DIAGNOSTICS TAN DELTA Test System

25 DIAGNOSTICS TAN DELTA Test System

26 TD30/TD60 TAN DELTA Test System Input Voltage TD kv RMS TD kV RMS 2 C Type Batteries(10hours) Tan Delta Resolution: 1 x 10-5 Accuracy: ±1 x 10-4 (load > 15nF) Frequency 0,1Hz Load Standard 15nF to 5µF (minimum 1µA RMS)

27 TD30/TD60 TAN DELTA Test System 3kg only! (TD605kg) Comprehensive Computer software TD Control Center Bluetooth TM Dongle Visual indication of TD Levels No complicated wiring, easy set-up!

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29 TD30/TD60 TAN DELTA Test System HVA TD Systems fits directly into the HVA Series of Generators TD Measurement and Pressure Testing at the same time No need for separate fibre optics for data transmission Ultra small size and light weight TD system (3kg for TD30 and 5kg for TD60) Standard Bluetooth built in for easy setup on computers running Microsoft Windows Complete PC based Reporting and Storage Software included

30 TD30/TD60 TD Control Center

31 TD30/TD60 TD Control Center

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33 SMART VLF with Tan Delta Diagnose your existing network quick and easy Make a fingerprint of your new installations or maintenance work as a future reference

34 PD30/60/90 Partial Discharge High Voltage VLF 0.1 Hz source HVA series HVA 30 / 60 / 90 High Voltage Filter & Coupling Capacitor Partial Discharge Detector PC laptop & Software for P.D. diagnostics and P.D. location

35 PD30/60/90 Partial Discharge A TDR snapshot is done for calibrating the PD magnitude. This can also provide information on the length of the cable, locations of joints, condition of the neutral wire.

36 PD30/60/90 Partial Discharge Once the cable length has been specified and the joints are located, the cable can be energized. Distance Fault Location

37 DSO graph PD30/60/90LOC graph TDR signature PD Amplitude & Location Cable lengt h Propagation velocity Coupling Capacitor PD discharge meter Test Voltage Meter

38 High Voltage Diagnostics Sarl 4, Rue de Lac CH 1897 Le Bouveret Switzerland

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