Transmission level instrument transformers and transient event recorders characterization for harmonic measurements

Author

MelioPoulos, A. P Sakis ; Zhang, Fan ; Zelingher, S. ; Stillman, G. ; Cokkinides, G.J. ; Coffeen, L. ; Burnett, R. ; McBride, J.

Author_Institution

Georgia Inst. of Technol., Atlanta, GA, USA

Volume

8

Issue

3

fYear

1993

fDate

7/1/1993 12:00:00 AM

Firstpage

1507

Lastpage

1517

Abstract

A technique for laboratory characterization of instrument transformers designed for transmission level voltage and current measurements is presented. The technique is also extended to transient event recorders (TERs). The objective of the method is to determine the suitability of existing substation instrument transformers for harmonic measurements, particularly in the frequency range of 60 to 1500 Hz covering the first 25 harmonics. Specifically, the following characteristics are of interest: transfer function magnitude and phase, linearity, and sensitivity of the frequency response to burdens. The measurement technique is based on exciting the instrument transformer primary with an impulsive waveform. Both input and output waveforms are recorded using laboratory grade probes and digitizers. Digital signal processing techniques are used to compute the instrument transformer frequency response. Several voltage transformers and current transformers in the 230 kV-765 kV voltage range were tested. The results are described.<>

Keywords

computerised instrumentation; frequency response; instrument transformers; power system harmonics; power system measurement; power system transients; power transformers; probes; substations; transfer functions; 230 to 765 kV; 60 to 1500 Hz; computerized instrumentation; current transformers; digitizers; frequency response; harmonic measurements; impulsive waveform; instrument transformers; laboratory characterization; linearity; magnitude; phase; power transformers; probes; sensitivity; substation; transfer function; transient event recorders; transmission networks; voltage transformers;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.252677

Filename

252677