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Analytical description for zero-sequence characteristics of five-legged core construction in transformers

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Title Analytical description for zero-sequence characteristics of five-legged core construction in transformers
 
Creator BHIDE, RS
KULKARNI, SV
BHANDARKAR, PB
 
Subject finite-element code
transient simulation
5-limb transformer
model
circuit
formulation
parameters
flux
 
Description The zero-sequence characteristics of a transformer are predominantly decided by its core construction. An analytical description for these characteristics of a five-legged transformer is presented in this study. The transformer is analysed by developing a simple reluctance model and by using the theory of sequence components. Two types of zero-sequence inductances are discussed, viz. open-circuit, that is, magnetising, zero-sequence inductance (L(0)(oc)) and short-circuit, that is, leakage, zero-sequence inductance (L(0)(sc)). The magnetising zero-sequence inductance is expressed in terms of the inductances contributed by flow of magnetic flux through the end-legs and its analytical expression is developed. Zero-sequence characteristics of a three-legged transformer are compared analytically with that of a five-legged one, thus highlighting the effect of end-legs. A practical five-legged transformer used in a 12 V, 5000 A recti. er system is considered for the purpose of experimental veri. cation. The magnetising zero-sequence inductance for this transformer is computed by developing its reluctance model. The short-circuit zero-sequence inductance is shown to be equal to the corresponding positive-sequence inductance and its value is computed after conducting standard open-circuit and short-circuit tests on the transformer. The recti. er system is modelled using coupled circuit. field formulation by developing a non-linear-transient finite element code in ANSYS Parametric Design Language (APDL) and values of L(0)(oc) and L(0)(sc) are computed. The results obtained from the reluctance model and the APDL are validated experimentally by performing zero-sequence tests on the five-legged transformer.
 
Publisher INST ENGINEERING TECHNOLOGY-IET
 
Date 2011-08-03T07:09:20Z
2011-12-26T12:54:05Z
2011-12-27T05:41:28Z
2011-08-03T07:09:20Z
2011-12-26T12:54:05Z
2011-12-27T05:41:28Z
2010
 
Type Article
 
Identifier IET ELECTRIC POWER APPLICATIONS, 4(6), 407-417
1751-8660
http://dx.doi.org/10.1049/iet-epa.2009.0199
http://dspace.library.iitb.ac.in/xmlui/handle/10054/8940
http://hdl.handle.net/10054/8940
 
Language en