Standards ATAMER DIŞ TİC. A.Ş. 0312 473 44 24 1

Content Introduction Standards IEC 60502-2014 CENELEC HD 620 IEEE 400 - 2012 IEEE 400.2 – 2013 IEC 60060-3 VLF Cable Testing

Standards IEC 60502-2014 Significant technical change: g) the inclusion of a 0,1 Hz test after installation! Ref. IEC 60502-2014, p. 11-12

Standards IEC 60502-2014 Ref. IEC 60502-2014, p. 45

Content Introduction Standards IEC 60502-2014 CENELEC HD 620 IEEE 400 – 2012 IEEE 400.2 – 2013 IEC 60060-3 VLF Cable Testing

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. 50 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

Content Introduction Standards IEC 60502-2014 CENELEC HD 620 IEEE 400 – 2012 IEEE 400.2 – 2013 IEC 60060-3 VLF Cable Testing

New standards available IEEE 400 - 2012 IEEE 400.2 - 2013

IEEE 400 - 2012: what’s new? Standards 1) HVDC testing not recommended on XLPE cables !!! Ref. IEEE400-2012, p.14

HVDC Standards IEEE 400 - 2012 VLF Sinus MWT with tan δ: Useful Ref. IEEE400 2012, p. 3 and p.43

Content Introduction Standards IEC 60502-2014 CENELEC HD 620 IEEE 400 – 2012 IEEE 400.2 – 2013 IEC 60060-3 VLF Cable Testing

Standards IEEE 400.2 - 2013 IEEE 400.2 - 2004 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

VLF MWT implemented as useful tool Standards IEEE 400.2 - 2013 VLF MWT implemented as useful tool Ref. IEEE400.2 2013, p. 9

IEEE 400.2 - 2013 Standards Voltage level up to 69kV covered Ref. IEEE400.2 2013, p. 11

Standards IEEE 400.2 - 2013 MWT as a replacement of the simple withstand test – with reduced test time, if TD values remain stable Ref. IEEE400.2 2013, p. 10

Content Introduction Standards IEC 60502-2014 CENELEC HD 620 IEEE 400 – 2012 IEEE 400.2 – 2013 IEC 60060-3 VLF Cable Testing

Standards IEC 60060-3 Distortion – minimum distortion required by IEC standard IEC 60060-3 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 %

Standards IEC 60060-3 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

+ - + - Standards IEC 60060-3 2) Symmetry – avoiding space charges (+) and the (-) half wave have the same peak-value and shape: No remaining DC offset! IEC60060-3: (+) 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!

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

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?

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