Izvorni znanstveni članak

SEISMIC ANALYSES FOR POWER TRANSFORMERS

Robert Platek ; ABB Sp. z o.o. Corporate Research, Poland
Grzegorz Juszkiewicz ; ABB Sp. z o.o. Corporate Research, Poland

Sažetak

Reliability and security of power systems, especially in areas prone to earthquakes, depends on
the seismic withstand of its components and interaction of these components with other elements. All
relevant power products and components should be designed and tested to guarantee high seismic
performance. Option which is strongly recommended for seismic qualification is shake table test. This
way is very expensive and in some cases like power transformers impossible due to its weight and size.
Because of this the numerical analyses can be very helpful to determine the dynamic characteristic of the
system. This way is more and more used during evaluation of seismic performance of power products,
especially in the design phase.
In the paper a different numerical approaches for seismic analyses of the power transformers
have been presented. In the first part of the article focus was put on typical simulation methods defined by
IEEE and IEC standards. This approach is dedicated only for transformer’s components. Due to fact that
standards do not provide clear information about fluid influence on power equipment during seismic
events, some investigations related with oil filled transformers were done and summarized. Three
different numerical methods were investigated. First one is built based on the Fluid-Structure Interaction
(FSI) methodology. In this approach combination of different software (CFD, structural, and coupling
code) is used to cover phonemes related with fluid dynamics and structural analyses. FSI methodology
gives a wide possibility but, it’s very complex however, is very complex which can be a disadvantage for
very complex objects. Next one uses acoustic elements, where the fluid is modeled as acoustic medium.
This is method which allows to take into account fluid during seismic simulations in simplified way. The
last one uses Lagrange and Euler element formulations (CEL) in which sloshing effect of the oil in power
products can be considered. All this approaches can be very helpful to determine the dynamic
characteristic of the transformers and its equipment including fluid.

Ključne riječi

transformer; seismic; Finite Element Method (FEM); acoustic medium; Fluid- Structure Interaction (FSI); Coupled Euler – Lagrange (CEL)

Hrčak ID:

199249

URI

https://hrcak.srce.hr/199249

Datum izdavanja:

15.8.2017.

Posjeta: 740 *