TY - GEN

T1 - Determination of a capacitance model for inductive medium voltage transformers

AU - Buchhagen, C.

AU - Reese, C.

AU - Hofmann, L.

AU - Däumling, H.

PY - 2012/5/1

Y1 - 2012/5/1

N2 - To increase the linear frequency range of inductive medium voltage transformers, the calculation of its frequency response will be the first step. For this several capacitances have to be known, such as the layer, the ground and the front part capacitances. For the calculation of these three most important parasitic capacitances mathematical models based on measurements of medium voltage transformers are developed. With the resulting equations, capacitances can be determined without a complicated three-dimensional field calculation. For the modeling of layer capacitances it is possible to fall back on the equation of cylinder capacitors which is completed by two correction factors. These are determined and verified by measurement on different voltage transformers. For the ground capacitance a simple equation is introduced, inspired by established equations for capacitance calculations. By means of measurements the required initial value is determined and the model for the ground capacitances is verified. Finally, the front part capacitances are described with a theoretical model, which is based on a simple field-theoretical approach.

AB - To increase the linear frequency range of inductive medium voltage transformers, the calculation of its frequency response will be the first step. For this several capacitances have to be known, such as the layer, the ground and the front part capacitances. For the calculation of these three most important parasitic capacitances mathematical models based on measurements of medium voltage transformers are developed. With the resulting equations, capacitances can be determined without a complicated three-dimensional field calculation. For the modeling of layer capacitances it is possible to fall back on the equation of cylinder capacitors which is completed by two correction factors. These are determined and verified by measurement on different voltage transformers. For the ground capacitance a simple equation is introduced, inspired by established equations for capacitance calculations. By means of measurements the required initial value is determined and the model for the ground capacitances is verified. Finally, the front part capacitances are described with a theoretical model, which is based on a simple field-theoretical approach.

KW - frequency estimation

KW - frequency response

KW - mathematical analysis

KW - power capacitors

KW - power transformers

KW - capacitance model determination

KW - inductive medium voltage transformers

KW - frequency response calculation

KW - front part capacitances

KW - parasitic capacitance mathematical models

KW - medium voltage transformer measurements

KW - three-dimensional field calculation

KW - layer capacitance modeling

KW - cylinder capacitor equation

KW - correction factors

KW - ground capacitances

KW - field-theoretical approach

KW - Capacitance

KW - Windings

KW - Voltage transformers

KW - Capacitance measurement

KW - Wires

KW - Voltage measurement

KW - Mathematical model

KW - ground capacitance

KW - layer capacitance

KW - parasitic capacitances

KW - voltage transformer

U2 - 10.1109/TDC.2012.6281501

DO - 10.1109/TDC.2012.6281501

M3 - Conference contribution

SP - 1

EP - 6

BT - PES T D 2012

ER -