Estimation of the Zero Sequence Voltage on the D-side of a Dy Transformer by Using One Voltage Transformer on the D-side

Summary, in English

The usual practice to measure the zero sequence voltage on the D-side of a transformer is to use three voltage transformers (VT), each of them connected between each phase and earth on the primary side and broken-delta connected on the secondary side. In this paper a method is presented for the estimation of the zero sequence voltage on the D-side of a Dy transformer by the use of only one VT connected between one phase and earth on the D-side and three VTs and current transformers (CT) on the y-side. The method is first introduced theoretically. Results from simulations and laboratory tests are then presented. The method proved to be accurate with an observed maximum error around 7% of nominal phase-to-earth voltage during transformer energization and below 1% in all other cases.

• Author: Francesco Sulla; Olof Samuelsson
• Department/s: Industrial Electrical Engineering and Automation
• Publishing year: 2008
• Language: English
• Pages: 517-522
• Publication/Series: The Institution of Engineering and Technology 9th international conference on developments in power systems protection : DPSP 2008, 17-20 March 2008.
• Links: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4497039; http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4497039&tag=1
• Document type: Conference paper
• Topic: Other Electrical Engineering, Electronic Engineering, Information Engineering
• Keywords: current transformers nominal phase-to-earth voltage transformer energization voltage transformer zero sequence voltage zero sequence voltage estimation
• Conference name: 9th International Conference on Developments in Power System Protection (DPSP2008)
• Conference date: 2008-03-17
• Conference place: Glasgow, United Kingdom
• Status: Published
• ISBN/ISSN/Other: ISBN: 978-0-86341-902-7