cigre 2010 santiago de chile · 2017. 3. 20. · -3ap3 fi 550 kv no damage-3ap1 fi 245 kv damage on...

Copyright © Siemens AGEnergy Sector

CIGRE 2010 “Seismic Behavior of Siemens Circuit Breakers during the Earthquake on27 February 2010 in Chile ”

October 19th, 2010

October 19 th, 2010Copyright © Siemens AG

Energy SectorUlf Heinrich

Siemens circuit breaker sold by factory Berlin andpercentage of CB with seismic requirements

In the years 2005-2010 round about 22 000 circuit breaker (life tank and dead tank ) have been delivered from the Siemens factory Berlin.

25% (5500) had seismic requirements from different standards (from 0.3g ZPA – mostly 0.5g ZPA).

Until the severe earthquake on 27 February 2010 no Siemens circuit breaker did fail caused by seismic action.



Brief history of seismic qualification of Siemens circuit breakers

-from 1990 – seismic tests with acc. time history; before 1990 seismic testswith sine beats

-from 1998 – dynamic calculations; FEM ADINA; before 1998 static calculations only

-from 2002 – dynamic analysis with ANSYS Classic

-from 2009 - dynamic analysis with ANSYS Workbench



Some aspects of the Standards IEEE 693,ETG and IEC 62271-300

IEEE ETG IEC

-calculation not excepted 169 kV - -and above

-switching during seismic test x - -

-sine beat x x -

-damping ratio for calculation 2% x x xif not justified other values



Comparison of calculation and test

Installation of test equipment




Natural frequencies

calculated tested location

X 4,9 Hz (- 6%) 5,2 Hz Bushing8,7 Hz minor frequency9,7 Hz minor frequency

19,1 Hz (+20%) 15,9 Hz Frame26,4 Hz minor frequency

Y 4,8 Hz (- 9%) 5,3 Hz Bushing15,5 Hz (+26%) 12,3 Hz Frame

23,1 Hz minor frequency

26,4 Hz minor frequency

Z not detected 15,8 Hz Control cabinet25,1 Hz minor frequency29,7 Hz minor frequency33,1 Hz minor frequency

Dire

ctio

n



Mises stress plot

test results 100%


133%

116% 207%

93%

91%

calculated results:



frequency: 100% about 140%

Unprestressed and pre-stressed modal analysis with response spectrum method

displacement: 100% about 50%

stress post insulator: 100% about 70%

F 2000 N0 N

(IEC 62271-300; 0,5g and 5% damping ration)



How many modes are necessary?

calculation with 3 modes

stress post insulator: 100% about 96%

calculation with only 1 mode



Influence of cable connection

(example from literature)

slack span:case 1 - 110 mm

slack span:case 2 – 490 mm



Influence of foundation and steel structure

seismic tests with two different steel structures showed a different of 40% in the bending moment of a life tank CB post insulator

frequency

acce

lera

tion

0,5g ZPA

dampers??



Some spectrums from Santiago de Chile5 % damping (acceleration not rectified)

critical frequency of about 2 Hz



Siemens circuit breaker in Chile

Behavior of Siemens circuit breakers during 27 of February 2010

-3AP3 FI 550 kV � no damage

-3AP1 FI 245 kV � damage on the mechanism housingportland cementation?

-3AP1 FG 245 kV � damage on some porcelains

-3AP1 DT FI 245 kV � no damage

-voltage level under 245 kV � no damage



3AP3 FI 550 kV with friction dampers

no damage occurred



3AP1 FI 245 kV

damage on:-the mechanism housing-portland cementation?



3AP1 FG 245 kV

-dynamic calculation did show a safety factor of more than two according the ETG 1.020

-cable connection on the terminals seems to be okay

-Why the porcelain broke?

-Frequencies and level of seismic motion?



Seismic analysis qualification by FEMin the past and present

ANSYS “Classic” ANSYS “Workbench”



Remedial work

The reinforcement of the corners of the mechanism housingFoto FE mesh



Comparison of calculationmechanism housing

without reinforcment with reinforcement

Mises stress 100% Mises stress about 50%



Future work

-use more accurate FE-Models (using the models directly from CAD-program in order to prepare the geometrical model)

-reinforce the mechanism housing with ductil steel parts below the steel frame

-perform a seismic test according ETG A.0.20 for the 3AP1FI 245 kV

-where necessary reinforce the porcelains

-use dampers where necessary

cigre 2010 santiago de chile · 2017. 3. 20. · -3ap3 fi 550 kv no damage-3ap1 fi 245 kv damage on...

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