1. Standards
ATAMER DIŞ TİC. A.Ş. 1

2. Content Introduction Standards IEC 60502-2014 CENELEC HD 620
IEEE
IEEE – 2013
IEC
VLF Cable Testing

3. Standards IEC 60502-2014 Significant technical change:
g) the inclusion of a 0,1 Hz test after installation!
Ref. IEC , p

4. Standards IEC
Ref. IEC , p. 45

5. Content Introduction Standards IEC 60502-2014 CENELEC HD 620
IEEE 400 – 2012
IEEE – 2013
IEC
VLF Cable Testing

6. Standards CENELEC HD 620 European Standard for Cable After Laying Test
CENELEC HD 620 S1 and 621 S1 1)
HV Test for PE or XLPE Cables from 6 to 36 kV
Method Frequency Test voltage [RMS] Testing time
VLF 0,1 Hz 3 x Uo 1 hour
Power Freq Hz 2 x Uo 1 hour
Paper insulated or mass impregnated cables like PILC a DC test with above mentioned parameters is recommended
Ref. CENELEC HD 620(S1)-1996, p. 5-C-19

7. Content Introduction Standards IEC 60502-2014 CENELEC HD 620
IEEE 400 – 2012
IEEE – 2013
IEC
VLF Cable Testing

8. New standards available
IEEE
IEEE

9. IEEE 400 - 2012: what’s new? Standards
1) HVDC testing not recommended on XLPE cables !!!
Ref. IEEE , p.14

10. HVDC Standards IEEE 400 - 2012 VLF Sinus MWT with tan δ: Useful
Ref. IEEE , p. 3 and p.43

11. Content Introduction Standards IEC 60502-2014 CENELEC HD 620
IEEE 400 – 2012
IEEE – 2013
IEC
VLF Cable Testing

12. Standards
IEEE
IEEE
Test level of 2 Uo to 3 Uo, or acc. to table for 5 kV – 35 kV cables
Differentiation between
- RMS value for sinusoidal waveform
- Peak value for rectangular/cosine rectangular waveform
Testing duration 15 to 60 min., recommended acc. to [Moh]-study 30 min.
Effect: - lower stress
- lower tree growth rate

13. VLF MWT implemented as useful tool
Standards
IEEE
VLF MWT implemented as useful tool
Ref. IEEE , p. 9

14. IEEE 400.2 - 2013 Standards Voltage level up to 69kV covered
Ref. IEEE , p. 11

15. Standards IEEE
MWT as a replacement of the simple withstand test –
with reduced test time, if TD values remain stable
Ref. IEEE , p. 10

16. Content Introduction Standards IEC 60502-2014 CENELEC HD 620
IEEE 400 – 2012
IEEE – 2013
IEC
VLF Cable Testing

17. Standards IEC
Distortion – minimum distortion required by IEC standard
IEC
Definition of VLF voltage - max. distortion of ± 5 % (Peak/RMS < √2±5%)
Reason: Reproducibility! Voltage shape should not affect the testing result!
True Sinewave < 0.5 %
Competitor A >> 5 %
Competitor B >> 5 %

18. Standards IEC
Distortion – minimum distortion required by IEC standard
BAUR True Sinewave
Voltage and Current
< 0.5 % from 10nF – 10µF
Sinewave competitor
Load Current > 5 300nF
Sinewave competitor
Load Current >> 5 27nF

19. + - + - Standards IEC 60060-3 2) Symmetry – avoiding space charges
(+) and the (-) half wave have the same peak-value and shape:
No remaining DC offset!
IEC : (+) and (-) peaks must not differ by more than 2% + -
(+) and the (-) halfwave:
Different peak-value and shape!
Remaining HVDC offset! + -
Remaining DC offset
Space charging!

20. Standards IEC 60060-3 Especially of aged PE, XLPE cables:
long term space charges can be created
Charging voltage
Distance in insulation
Voltage distribution after grounding
Voltage distribution during DC test
~kV
Remaining space charge voltage
DC test voltage
void
Space Charge in XLPE, effect of DC test
Remaining voltage offset as problem,
if the cable is put back into service

21. New standards: Summary
HVDC Testing is not recommended anymore
VLF Sinusoidal tan-delta Monitored Withstand Test recommended as useful
Why sinusoidal VLF? And why BAUR truesinus® VLF?
Why tan-delta and partial discharge?
What is a monitored withstand test? What are the benefits?

22. Thank you for your kind attention!
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