ARWtr 2004 Modern Transformers October. Vigo Spain Transformers
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1 The procedure s bes explaned by Fg. 1a + 1b 1U 1V 1W 1N HV S U 0 LV 2V 2U -nalyser W Fg. 1a. Measuremen of he relaxaon currens usng he Semens measurng sysem -nalyser-3205 [14, 20] U 0 u T P T D POL DEPOL Fg. 1b. Prncple waveform of relaxaon currens PTD T - Consul - RWr 4, VIGO, Span - 1
2 a. I(ω) χ ( ω ), σ U(ω) R b. C R p1 C p1 R pn C pn Pressboard LV spacers ol barrers Pressboard Barrer (pressboard) Ol duc c. Spacer (pressboard) HV HV I d. S: spacers B: barrers O: ol CO CS RS,1 RS,n RO RS CS,1 CS,n U 0 CB RB,1 RB,n e. LV RB CB,1 CB,n Fg. 2 a. Plae capacor as a model for delecrc arrangemens b. Model for he behavour of a delecrc wh arbrary polarsaon characersc and conducvy c. Par of he cross-secon of a power ransformer man nsulaon sysem beween HV and LV wndngs d. Smplfed geomery model for he man componens ol, barrers and spacers e. Delecrc model for he nsul. sysem of power ransformers PTD T - Consul - RWr 4, VIGO, Span - 2
3 Tme Doman nalyss Frequency Doman nalyss nal curren mpulse U ol/ R ol C barr * R öl an δ FDS U/ R barr f pol () depol () Polarsaon Depolarsaon u() DC Ur max RVM Recovery Phase Ol Channels Spacers c d C ol * R ol C barr * (R barr R parall) Barrers Fg. 3: Summary and Comparson of he prncples of delecrc response analyss for / FDS and RVM. PTD T - Consul - RWr 4, VIGO, Span - 3
4 n ol conducvy Man Influences on Curves n Ol-Barrer Sysems ol properes geomery ageng 1 n polarsaon and depolarsaon currens waer conen 0 p p 1 s s 0 s 00 s me Fg. 4 Man nfluencng parameers on -Curves from he Barrer Insulaon Sysems PTD T - Consul - RWr 4, VIGO, Span - 4
5 Influence of waer conen and barrer geomery n 1 Polarsaon Curren n 1 n w = 2 % 1 n w = 2 % 0 p 0 p p Depolarsaon Curren p Whou ol channel: d = 0 mm Wh ol channel: d = 9.6 mm 0 n n n 1 n w = 6 % 1 n w = 6 % 0 p 0 p p 1 s s 0 s 00 s me p 1 s s 0 s 00 s me Fg. 5: Influence of waer conen and barrer geomery PTD T - Consul - RWr 4, VIGO, Span - 5
6 -7-6 pol pol -9 σ = 3-13 S/m σ = 6-13 S/m s 000 a. -9 rm= 1 % rm = 0.5 % s 000 Fg.6a. Effec of ol conducvy and mosure conen n he sold nsulaon maeral on he polarsaon curren (pol) -7-8 Polarsaon Currens rm = 1.0 % b. -9 Measuremen Calculaons - rm = 0.5 % s 000 6b. analyss of a 392 MV ransformer PTD T - Consul - RWr 4, VIGO, Span - 6
7 7a 7b -4 Polarsaon Currens before he ol exchange -5 Measuremen 3 % -6 3,5 % rm = 3,0 % -7 2,5 % afer he ol exchange -5-6 Measuremen 3 % -7 2,5 % rf = 2,7 % s 000 before dryng -5 Polarsaon Currens -6 Measuremen 7c -7-8 rm = 2,7 % 3 % 2,5 % 7d -5 afer dryng -6 Measuremen -7 rm = 1,7 % 2 % ,5 % 00 s 000 Fg. 7a-d: Feld measuremens on a 300 MV Transformer PTD T - Consul - RWr 4, VIGO, Span - 7
8 The and FDS Measurng and nalyss Sysem are nondesrucve / non-nvasve mehods whch provde relable and farly comparable nformaon abou he condon of a Transformer s nsulaon Sysem, such as: 1. Mosure conen n he sold nsulaon 2. The ol conducvy 3. The an dela 4. The polarsaon ndex 5. The polarsaon specra Fg 8: Conclusons PTD T - Consul - RWr 4, VIGO, Span - 8
9 PTD T - Consul - RWr 4, VIGO, Span - 9
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