EREC G5 Stage 2 Sub-group. Meeting No. 1
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1 EREC G5 Stage 2 Sub-grup Meeting N. 1 Held at William Gilbert Meeting Rm, REEC Building, Sir William Siemens Huse, Princess Rad, Manchester, M20 2UR On Mnday 13th June :30-14:30 Meeting Ntes Attendee Affiliatin Initials Rle Frank Griffiths ABB FG Member Andrew Oliver TNEI AO Member Simn Scarbr WPD SPS Chair Ahmed Shafiu Siemens AS Secretary Item Tpic & Nte Actin 2. Sub-grup Chair & Secretary SPS agreed t chair and AS t take ntes. 3. Terms f Reference (TR) SPS: The TR requires us t cnsider whether alignment with ther standards (e.g. IEC TR ) is apprpriate. 4. Review Stage 2 & pssible changes Existing Stage 2 apprach verview AO highlighted an errr in the flw chart f Figure 1. The failed cnditin cmplies with Table 12 shuld be an input t DNO determines netwrk distrtins. FG nted that lack f understanding ver scaling f the tables 6, 7, 10 & 12 leads t issues cntractually. Clarity shuld be imprved if such tables remain. There was discussin ver whether applicatin f Stage 2 really requires measurements in all cases. Pst-meeting nte. SPS: Table 10 desn t require measurement, althugh the values quted are derived frm Table 12 (which des as it assumes 75% PL is left); hwever, Table 10 is based n the current emissin percentages in ACE 73 Appendix C being used t derive the largest equipment rating that met the current limits in 12. These kva values were runded and then divided by 6 t give the values in Table 10. S Table 10 is nt sensitive t
2 measured values unless very clse t r abve Planning Level.> FG believes it wuld be useful t prvide a methd fr calculating HV distrtin frm LV measurements (including the phase angles). AS stated that LV measurement pint will nt exist fr the current cnnectin and will have t rely n an existing LV cnnectin pint. Here LV is 400V. FG stated then it cmes dwn t whether the LV measurement available is a representative f the cnnectin pint upstream. FG nted that the current emissin spectrum differs fr wrking pwer value cmpared with maximum pwer value and als changes if the amunt f equipment changes. He suggested that therefre the assessment shuld primarily cnsider nt the rated cnditins f the equipment, rather the wrking pwer cnditins. This will especially be the case fr plant items having significant shrt term verlad capability. FG nted that under unbalance cnditins the current emissins change; ntably triplen behaviur. He als stated that unbalances n the netwrk will cause triplens t pass thrugh t the LV side which has nthing t d with the cnnected lad. AO & FG raised the pssibility f revising the assessment such that it predicts the vltage distrtin n the basis f fault level and percentage f Planning Level equipment current emissin prfile. This may avid the need t measure backgrund if the values are small (the limit t be determined) and may allw Table 12 t be remved. FG agreed t write this up/prepare pssible flw chart. AO highlighted the need t cnsider DNO discretin which may allw cnnectin withut backgrund measurement. FG Previus suggested text (Aug 2011 draft) The previus text prepared by Geff Brwn was briefly reviewed. The fllwing were highlighted by SPS: Current limits n per MVA and per 10MVA basis. The inclusin f active infeed cnverters. Change f the Typical value f F fr 11kV frm 100MVA t 60MVA (default). Requirements arising frm draft EREC G5/5 Draft V6 Alignment with Stage 1 apprach Including a Cmpliant with Resnant plant requirement? FG stated it is nt clear whether in Equatin 5 cnsiders the presence f detuning r inrush reactrs in cap bank. Aggregatin as per general text. FG stated that straight additins f 5 th harmnic may nt be the right apprach. It was nted by all that the wrking grup has decided IEC summatin apprach. Extensin t 100 th harmnic. SPS expressed cncern ver measurements at 11kV f
3 higher rders. AS stated accuracy f the mdels at higher frequency is als a cncern. N allcatin (except as inferred in the tw tables equivalent t Stage 1 tables 13 and 14). Ignre transfer frm upstream. AS stated that calculatin f transfer frm upstream wuld require detail mdelling. N alignment with Stage 2 f IEC TR New cnsideratins (NB Agenda items belw) Vltage surce versus current surce FG stated that majrity f the surces cnnected are vltage nt current surce based. Wrst case netwrk impedance/etr112/values f k Aggregatin/summatin see ntes f full WG S i /S c 0.2% (IEC TR ) 5. Agree utline spec fr Stage 2 update 6. Detailed review 6.1 Wrst case netwrk impedance/etr112/values f k (G5/4-1 Table 8) SPS shwed a graph prduced by a cnsultant lking at the driving pint impedance fr three types f Primary substatin: rural, urban (all cable) and mixed. This raised the cncern that the maximum impedance envelpe may nt be cnservative in all cases, nting that the resnant peak may be beynd the 8 th harmnic. AS stated the resnant peaks are als impacted by the upstream and dwnstream netwrk arrangement. It als illustrated that there may be advantage in ding a mre detailed study f harmnic impedance at the PCC (e.g. Stage 2 plus). After discussin AO agreed t cnsider hw best t d mdelling t examine varius substatins t see if the maximum impedance envelpe needs updating and als if the impedance envelpes frm varius substatins can be generalised; it may be that a qute culd be prepared. AO Pst-meeting nte. SPS: I have discussed this issue als with Edif ERA. They may als be able t d smething similar. 6.2 Simple reactance mdel & vltage surce versus current surce SPS: Time did nt allw a detailed discussin. FG cnsiders nature depends n rati f fault level (surce impedance) t equipment rating. Review f the frequency dependent supply impedance in ETR112 suggests that Table 12, and Table 7, be scrapped and a vltage distrtin calculatin be made based n estimated lad harmnic spectrum and frequency dependent impedance values. This apprach wuld replace k values with a revised impedance rati equatins fr typical supply arrangement e.g cable vs verhead line.
4 Nte : Mst estimates f harmnic spectra assume a linear impedance/frequency relatin fr the supply impedance. If we accunt fr the variability f supply impedance with frequency then the cited spectra will have t be adjusted accrdingly. This is because we are dealing with vltage surce, nt current surce. SPS Pst-meeting nte: A balance is required s that nt all studies require very detailed mdelling if pssible. We are lking t investigate further the impedance envelpe by use f mdelling t see if a maximum impedance envelpe apprach can be used. 6.3 Aggregatin/summatin see ntes f full WG 6.4 Default fault levels (G5/4-1 Table 9) SPS The 100MVA typical value is t high. Levels at the ends f rural 11kV circuits can be as lw as 10MVA. 6.5 Current emissin limits (G5/4-1 Table 12 & ETR 122) SPS explained hw Table 12 had been derived. Table 12 the currents equate t ¼ f the PL fr thse subject t linear summatin and this allwed them t have 66.7% f the PL fr thse subject t quadratic additin (frm sqrt(1^2-0.75^2) = 0.66). If we change the summatin expnents fr vltage t IEC then the figures will need t be rewrked See cmments 6.2 abve 6.6 kva limits (G5/4/1 Table 10) SPS explained hw Table 10 has been derived, referring t ACE 73 and the current prfiles assumed in Appendix C. FG nted that these assumptins appear ut f date. Review f Table 10 derivatin shws a mix f G5/3 and ACE73.The typical harmnic ratis in Table C1 are n lnger representative f 6 pls dide bridge feeding a capacitr bank. Typical values are nw ; Harm New ratis ACE73 : Table C % 17.5% % 11.0% % 4.5% % 2.8% These revised values reflect back t Stage 1 : Table 10 as Supply Vltage Three Phase Cnverters 6 Pulse (KVA) 12 Pulse (KVA) 400V This assumes that these values match the harmnic current crrespnding t a 25% planning level 10MVA LV fault,
5 an assumed pwer rati f 6 (as per? para 5 sectin 5.2 ACE73) and an impedance rati f 0.5 (relative t symmetrical fault level impedance) 6.7 S i /S c 0.2% (IEC TR ) SPS highlighted this apprach frm Stage 1 f the IEC TR; it has caveats regarding resnance, existing backgrund distrtin levels and risk f interference. AO nted that Table 10 is similar, albeit referring t equipment rating. 7. Update spec fr Stage 2 update Due t lack f time, SPS asked that each member list their requirements fr the revisin f Stage 2 in terms f minimum requirements and pssible requirements. All 8. Allcate tasks See Actins. 9. AOB Nne 10. Future meetings Dates T be plled. Agenda items. T be agreed by . Vltage surce versus current surce.
6 Draft Spec fr Stage 2 Update (SPS versin 1) Serial Item Cmment 1 Alignment with Stage 1 apprach. 2 Include a Cmpliant with Resnant plant requirement? 3 Aggregatin as per general text. NB This will affect Table 10 & 12 values. 4 Extensin t 100 th harmnic. 5 N allcatin (except as inferred in the tw tables, equivalent t Stage 1 tables 13 and 14). 6 Ignre transfer frm upstream. 7 N alignment with Stage 2 f IEC TR Imprve clarity ver scaling f values in Tables 10 & Update harmnic emissin prfiles used t derive Table 10. NB This will affect values in Table Change typical fault level t be mre typical (e.g. 60MVA fr 11kV). Dependant n apprach used fr item 8 this wuld als feed int Table 12 values. 11 Bring table 11 values int line with updated planning limits. 12 G5/5 draft 6 brings all 33kV cnnectins int stage 2, we shuld prvide a view t the main grup n whether including 33kV cnnectins in stage 2 is apprpriate. SPS pst-meeting nte: I have asked Frz whether 33kV cnnectins shuld g t Stage 3. Minimum Requirements Serial Item Cmment 1 Update fr vltage surces. 2 Review Maximum Impedance Zh Envelpe. 3 Cnsider including S i /S c 0.2% simplified assessment. 4 Prvide methd f inferring HV levels frm measurement at LV. 5 Revise assessment t predict vltage distrtin n basis f fault level and % PL 6 Cnsider Stage 2 plus (simplified Stage 3) where the actual Z versus frequency driving pint impedance is used rather than Maximum Impedance Envelpe 7 Cnsider if PWHD clause fr many marginal current exceedences 23 h 50 f table 12 is wrthwhile r if the cnnectin in that case shuld just prceed t the vltage calculatin. Pssible Review/Requirements
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