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Design optimization of Post Insulator Design optimization of Post Insulator in Voltage Indicating System of in Voltage Indicating System of
Medium Voltage SwitchgearMedium Voltage Switchgear
-Presented by Shashwat S. Basutkar
M.Tech (Power system)College Of Engg.Pune
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ContentsContentsIntroductionVoltage Indicating SystemPartial Discharge SensorSimulation ModelValidationConclusion & Future scopeReferences
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IntroductionIntroductionTotal installed
capacity(Generation):: India:185497 MW.The electricity consumption per
capita for India is 566 kWh. Development of transmission line in India
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IntroductionIntroduction
Problems: a)Power shortage.
b)Power quality problems.Current solutions:
Industry maintains auxillary supply. For domestic purpose inverters are maintained. Use of reliable switchgears.
Trend of SMART grid.
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SwitchgearSwitchgearIt consists of:-
◦ LV compartment◦ Withdrawable Trolley◦ Potential Transformer◦ Explosion Vent◦ Current Transformer◦ Surge Arrester◦ Earth Bus◦ Power pack.◦ Circuit Breaker
One of the key component in LV compartment is
Voltage Indicating System.
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Challenges before every Challenges before every switchgear manufacturerswitchgear manufacturer
Partial Discharge problem.Space required for switchgear
panel.Cost optimization.
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Voltage Indicating SystemVoltage Indicating SystemThe Voltage Indicator System = Capacitive Post Insulator + An
electronic unit. Epoxy post insulator plays vital
role in voltage indicator with in-built capacitive voltage divider as well.
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Epoxy post insulator in VISEpoxy post insulator in VISEpoxy post insulators are
installed where voltage is present.
Till now, those post insulators with capacitive divider are having low capacitance.
As per IEC 61243-5,it should be within range of 74-88pF.
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WORKING PRINCIPLEWORKING PRINCIPLE
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Problem of Partial Problem of Partial DischargeDischargeMajority of switchgear failure
(22%) is due to partial discharge.In proposed design ,it will be less
effective.More immune to voltage
fluctuation.
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PD SensorPD SensorCoupling CapacitorRFCT
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Geometry design of post Geometry design of post insulatorinsulator
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Geometry design of post Geometry design of post insulatorinsulator
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Simulation modelSimulation model
28pF Capacitive Post Insulator
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Simulation modelSimulation modelParameter Initial
Values (mm) for
50pF
Achieved Values
(mm) for 60 pF
P1 8 11.486
P2 42 239.995
P3 40 15.001
P4 20 29.3
P5 246 220.5
P6 270 245.5
P7 296 270.5
P8 13 R1.5
P9 13 R1.5
P10 13 R1.5
P11 20 21.5
P12 20 21.5
P13 20 21.515
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Practical ModelPractical Model
50pF Capacitive Post Insulator
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Simulation of Proposed Simulation of Proposed designdesign
60pF Capacitive Post Insulator
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Optimization AlgorithmOptimization Algorithm
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Start
Initial parametric model of insulator
For N=1 to MAX_GE
N
A
C
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A
Preparation of the model in the pre-
processor
Evaluate the objective function
f(x)
Calculation of capacitance & electrical field
strength
FEM solver of MAXWELL software
Meshing of geometry
B
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f(x) < of require
d conditio
n
B
Use respective
Optimization technique algorithm
Optimal insulator’s geometry
YE
S
End
End
NO
C
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Objective FunctionObjective Function
8 3 2 6 41 1.9836*10 * 0.0041* 5.6480*10 * 5.175*10P x x x
8 83 2 6 63 1.889*10 * 7.106*10 * 1.144*10 * 6.9*10P x x x
10 73 2 54 9.05*10 * 9.69*10 * 5.749*10 * 0.001007P x x x
9 52 9.23*10 * 6.942*10P x
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Optimization Set ValuesOptimization Set Values
Parameters
Weighing Factor
Initial value (mm)
Min. Value(mm)
Max.Value (mm)
Final value(mm)
P1 0.4 8 8 11.5 11.486
P2 0.5 42 42 240 239.995
P3 0.0001 40 15 40 15.001
P4 - 20 16 33.8 29.3
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ValidationValidationTechnical Features:
◦High voltage :......................................... 33 kV
◦ Primary Capacitance ..............60 pF+/- 5%
◦Partial Discharge < 10pC at 21kV
◦Dielectric strength :............................40 kV
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Space and Cost Space and Cost OptimizationOptimizationThe typical height of post
insulator is optimized from 330mm to 300mm.
If such kind of insulators are manufactured in bulk quantity then the cost/insulator gets reduces to 50% of that much of manufacturing of one post insulator.
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Reduction of height fromReduction of height from330mm to 300mm330mm to 300mm
BeforeBefore AfterAfter
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ConclusionConclusionProvides safe insulation as
support insulator.A prototype post insulator has
been built and successfully tested with High Voltage test and Partial Discharge test.
Optimization of space and cost is achieved.
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ConclusionConclusionParamete
rsExisting
(ECS)NTGM36N
3(ABB)
KEVA(ABB)
Proposed
Capacitance
50pF - - 60pF
Voltage(kV)
33 36 24 33
O.D.(mm) 67 95 148 90
Height(mm)
330 310 210 300
Volume (Approx.)(mm^3)
1163465.277
2197347.712
3612705.888
1908517.537
Weight(Kg) 2.5 2.8 4 5.34
Space requireme
ntP.U.
1 1.8886 2.1051 1.6403
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Future scopeFuture scopeThe same post insulator with
some modification can be used as partial discharge sensor.
Fault can be detected internally for the switchgear panel with the help of this system.
Improvement of quality/cost ratio.
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ReferencesReferences P.Garg, “Energy scenario and vision 2020 in India,”
Journal of Sustainable Energy & Environment 3 (2012) 7-17, 2012.
“Ministry of Power, annual report,” 2011-12. “IEEE standard definition for power switchgear.” IEEE
std.(C37.100), 1992. M. Imming and H. Engberson, “Fixed or withdrawable
switchgear,” Drawings of MV switchgear Panel. I. Ticar, P. Kitak, A. Stermecki, J. Pihler, O. Biro, and K.
Preis, “Comparison between ‘cut and try approach’ and automated optimization procedure when modeling the MV switchgear,” in Proceedings of IASME/WSEAS International conference on Energy and environment, (Slovenia), May 2007.
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ReferencesReferences E. Barkanov, Introduction To Finite Element Method. 2001. I. Ticar, P. Kitak, A. Stermecki, J. Pihler, O. Biro, C. Magele,
and K. Preis, “Use of optimization algorithm in designing MV switchgear insulation elements,” IEEE transaction on magnetics, vol. 42, April 2006.
ELECTRONSYSTEM, HVDO-Voltage Detecting System, 2008. ELECTRONSYSTEM, HVD3-Voltage Detecting System, 2013. “Predictive diagnostics for switchgear,” tech. rep., Eaton
Corporation, USA, March 2008. Dynamic Ratings, Radio Frequency Current Transformers. “Technical notes on ansys 3D maxwell.” “Technical notes on ansys 3D maxwell field calculator.” I. Ticar, P. Kitak, A. Stermecki, and J. Pihler, “Virtual design
of insulation elements based on FEM and automated optimization process,” tech. rep., Graz University of Technology,2005.
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Any questions ?Any questions ?
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