adoption of silicon rubber insulator < experience of getco...
TRANSCRIPT
Adoption of Silicon Rubber Insulator < Experience of GETCO >
25th Sept’13
Cost Comparison
2008-09
2009-10
2010-2011
2011-2012
2012-2013
2013-2014
220 KV, 90KN
String of 14 nos. of Antifog Disc Insulators
8303 7027 7378 8988 8263 9123
SRI 9186 6107 4271 5188 5250 5468
SRI cost vs. AF Disc Insulator string
+10 % -13 % -42 % -42 % -36 % -40 %
220 KV, 120KN
String of 15 nos. of Antifog Disc Insulators
11162 9712 9302 10681 10456 10866
SRI 9598 7142 4610 5634 5488 5660
SRI cost vs. AF Disc Insulator string
-14 % -26 % -50 % -47 % -47 % -48 %
(Figures in Rs.)
Superiority of SRI over Porcelain Insulator
Sr No.
PARAMETERS SRI PORCELAIN A/F DISC INSULATORS
1 Hydrophobicity More Hydrophobic Less Hydrophobic
2 Recovery of Hydrophobicity
High Nil
3 Performance under industrial and coastal pollution
Better Low
4 Resistance to vandalism High Low
5 Weight Very low High
6 Handling of string Easy Difficult
7 Maintenance Very Low High
8 More Creepage distance with same length
Achievable Not achievable
9 Cost Low High
10 Visual Aesthetic look Conventional look
LENGTH SELECTION220 kV -120 KN Tension String
INSULATOR LENGTH CREEPAGE Appx. WEIGHT
ANTIFOG DISC INSULATOR STRING
2175 mm. 6450 mm. 26.3 mm/kV
127.5 kgs.
SRI 2175 mm. 7595 mm. 31 mm/kV
15 kgs.
LENGTH SELECTION220 kV - 90KN Suspension String
INSULATOR LENGTH CREEPAGE Appx. WEIGHT
ANTIFOG DISC INSULATOR STRING
2030 mm. 6020 mm. 24.6 mm/Kv
98 kgs.
SRI 2030 mm. 7595 mm. 31 mm/kV
12 kgs.
DESIGN CHANGE EVOLUTION
DESIGN CHANGE IMPETUS
Increase of Creepage Distance from 25mm./kV to 31 mm./kV (for 220 kV SRI – 6125 mm. to 7595 mm.)
To improve performance under heavy Industrial and coastal pollution area
Adoption of Injection moulding Avoid multiple interface design
Adoption of plain design Avoid accumulation of dust and pollution in under rib design
End termination crimping with Acoustic method and overlap design at end fitting interface
To predict damage free end fitting crimping and to ensure hermetically sealed end fitting
Type Test Evolution
ADDITION OF TYPE TEST REFERENCE IMPORTANCE
Multi stress test for 5000 Hrs. IEC 61109 1992-03
Accelerated ageing Test including salt fog, humidity, solar radiation simulation to ensure performance under extreme conditions
Power Arc Test IEC 61467-1997 Simulation of flash over trip out at 10 kA x15 cycles to ensure end fitting interface performance
Grading Device Test GETCO Procedure Simulation of vibrations to check displacement of corona control ring from placement
ELECTRIC FIELD MODELLING (FEM analysis)
*** To derive optimum placement of Corona control ring to reduce stress at Interface
Analysis of tripping data Navsari Circle
1 Year Before
Replacement
1 Year After
Remark
220 kV Vav – Mota 2 T/T – 1S/F - 1
08.2009 to 10.2009
T/T – 2S/F - 0
TT
SF
220 kV Vav – Ukai 1 T/T – 4S/F – 4
08.2009 to 10.2009
T/T – 0S/F – 0
TT
SF
220 kV Mota – Ukai 2 T/T – 9S/F – 3
08.2009 to 10.2009
T/T – 3S/F – 0 TT
SF
220 kV Ukai (H) – Ukai (Th)-2
T/T – 0S/F – 3
03.2012 to 04.2012
T/T – 0S/F – 0
---- TT
SF
Analysis of tripping data Bharuch circle
Line Before SRI Replaced After Remark
220 kV Haldarwa -Jambuva
TT - 83.2012
TT - 8 -- TT
SF - 2 SF - 2 -- SF
220 kV Haldarwa -Zagadiya
TT - 23.2012
TT- 1 TT
SF - 1 SF - 0 SF
220 kV Haldarwa -Dahej
TT - 1 04.2010 to 07.2010
TT - 1 -- TT
SF - 0 SF - 1 SF
220 kV Haldarwa -IPCL 1
TT - 2 04.2010 to 07.2010
TT - 3 TT
SF - 3 SF - 2 SF
220 kV Haldarwa -IPCL 2
TT - 7 04.2010 to 07.2010
TT - 4 TT
SF - 1 SF - 4 SF
220 kV Achchaliya - Ukai (H) 1
TT - 7 07.2008 to 11.2009
TT - 0 TT
SF - 19 SF - 1 SF
220 kV Achchaliya - Ukai (H) 2
TT - 3 04.2009 to 06.2012
TT - 0 TT
SF - 1 SF - 0 SF
220 kV Achchaliya - Ukai (Th) 1
TT - 3 12.2009 to 10.2012
TT - 0 TT
SF - 0 SF - 0 SF
Analysis of tripping data Bharuch circle
Line Before SRI Replaced After Remark
220 kV Achchaliya - Ukai (Th) 2
TT - 312.2009 to 10.2012
TT – 2 TT
SF - 0 SF – 0 -- SF
132 kV Achchaliya -GNFC 1
TT - 607.2011 to 10.2012
TT – 0 TT
SF - 0 SF – 0 -- SF
132 kV Achchaliya -GNFC 2
TT - 307.2006 to 04.2007
TT – 0 TT
SF - 0 SF – 0 -- SF
132 kV Achchaliya Ankleshwar 1
TT - 004.2007 to 04.2010
TT – 1 TT
SF - 2 SF – 0 SF
132 kV Achchaliya Ankleshwar 2
TT - 204.2007 to 04.2010
TT – 1 TT
SF - 0 SF – 0 -- SF
220 kV Kim- ZagadiyaTT - 4
01.2011 to 02.2011TT – 0 TT
SF - 1 SF – 0 SF
220 kV Kim - KosambaTT - 3
01.2011 to 02.2011TT – 6 TT
SF - 4 SF – 0 SF
220 kV Kim - GSEGTT – 2
01.2011 to 02.2011TT – 2 -- TT
SF - 2 SF – 0 SF
220 kV Kim - MoraTT - 5
01.2011 to 02.2011TT – 1 TT
SF - 3 SF – 0 SF
Analysis of Tripping Data Anjar circle
Line Before SRI Replaced After Remark
220 kV Anjar-Kukma
TT - 13 10/ 2012 to 11/ 2012
TT – 1 TT
SF - 1 SF – 0 SF
220 kV Tappar –Nanikhakhar 2
TT - 10 08/ 2009 to 09/ 2009
TT – 4 TT
SF - 5 SF – 1 SF
220 kV Nakhatrana-Nanikhakhar-1
TT - 0 07/ 2007 to 09/ 2007
TT – 0 -- TT
SF - 8 SF – 0 SF
220 kV Nakhatrana-Nanikhakhar-2
TT - 0
07/ 2010
TT – 0 -- TT
SF - 8 SF – 0 SF
220 kV Shivlakha-Morbi2
TT - 0 07/ 2007 to 07/ 2010
TT – 0 -- TT
SF - 3 SF – 0 SF
FLASH OVER 66 kV SRI
FLASH OVER 66 kV SRI
DAMAGED 66 KV SRI
FLASH OVER 66 KV SRI
16Thank you !!!
PROCUREMENT OF ANTIFOG DISC INSULATOR
YEAR 90 KN 120 KN 160 KN
07-08 77500 21500 0
08-09 39929 17582 6680
09-10 88616 32016 1008
10-11 116886 65854 6630
11-12 23034 51007 1380
12-13 19800 11715 380
TOTAL 365765 199674 16078
PROCUREMENT OF ANTIFOG DISC INSULATOR
VOLTAGE CLASS (KV) 132 132 220 220 400 400
90 KN 120 KN 90KN 120 KN 120 KN 160 KN
07-08 3700 2500 5700 3150 0 0
08-09 0 0 0 0 0 0
09-10 4126 3346 20917 7427 0 0
10-11 1300 840 4355 3082 5557 6158
11-12 3000 3260 14677 9500 0 0
12-13 2100 800 14450 8772 6929 3638
TOTAL 14226 10746 60099 31931 12486 9796
END FITTING OVERLAP – PLAIN DESIGN
COST COMPARISION OF 220 KV, 90 KN SUSPENSION SRI v/s A/F INSULATOR STRING
Rs.
COST COMPARISION OF 220 KV, 120 KN TENSION SRI V/S A/F INSULATOR STRING
Rs.
PROCUREMENT OF ANTIFOG DISC INSULATOR STRING
VOLTAGE CLASS (KV) 132 132 220 220 400 400
90 KN 120 KN 90KN 120 KN 120 KN 160 KN
07-08 0 0 684 420 36 0
08-09 0 0 804 684 0 38
09-10 0 0 6 24 0 0
10-11 0 0 0 0 480 276
11-12 0 0 72 60 0 0
12-13 0 0 0 0 0 0
TOTAL 0 0 1566 1188 516 315