Calculation of Initial Short-Circuit Currents in Medium Voltage Networks According to the Standard PN-EN 60909
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Abstract
Determining the short-circuit currents is usually conducted by network analyses. An important feature of this calculation is carried out according to the recommendations of the standard PN EN 60909. This paper describes the models of the basic elements of the network with the method of determining the impedance parameters including correction factors introduced by the standard. Thevenin’s method connected with the nodal method are presented and used to determine the initial short-circuit for the example medium voltage network. Results are compared with the ones obtained without taking into account the correction factors.
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References
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PN-EN 60909-0:2002, Prądy zwarciowe w sieciach trójfazowych prądu przemiennego, Część 0: Obliczanie prądów [Short-circuit currents in three-phase a.c. systems – Part 0: Calculation of currents].
IEC/TR 60909-1: Short-circuit currents in three-phase a.c. systems, Part 1: Factors for the calculation of short-circuit currents according to IEC 60909-0, 2002-07.
IEC/TR 60909-2: Short-circuit currents in three-phase a.c. systems, Part 2: Data of electrical equipment for short-circuit current calculations, 2008-11.
PN-EN 60909-3:2010: Prądy zwarciowe w sieciach trójfazowych prądu przemiennego, Część 3: Prądy podwójnych, jednoczesnych i niezależnych, zwarć doziemnych i częściowe prądy zwarciowe płynące w ziemi [Short-circuit currents in three-phase a.c. systems, Part 3: Currents during two separate simultaneous line-to-earth shortcircuits and partial short-circuit currents flowing through earth].
IEC/TR 60909-4: Short-circuit currents in three-phase a.c. systems, Part 4: Examples for the calculation of short-circuit currents, 2000-07.