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

Journal Article · Thu Jul 01 00:00:00 EDT 1993 · IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/61.252677· OSTI ID:6089363

Meliopoulos, A P.S.; Zhang, Fan ^[1]; Cokkinides, G J ^[2]; Coffeen, L; Burnett, R; McBride, J ^[3]; Zelingher, S; Stillman, G

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1. Georgia Inst. of Technology, Atlanta, GA (United States)
2. Univ. of South Carolina, Columbia, SC (United States)
3. Georgia Power Co., Atlanta, GA (United States)

This paper presents a technique for laboratory characterization of instrument transformers designed for transmission level voltage and current measurements. 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 in the frequency range of 60 to 1500 Hz: 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. Subsequently, digital signal processing techniques are used to compute the instrument transformer frequency response. Several voltage transformers (both PTs and CCVTs) and current transformers in the 230kV-765kV voltage range were tested. The results of these tests are described in the paper. Conclusions are presented regarding the suitability of the instrument transformers and transient event recorders for harmonic measurement and the requirements for such a system. A quantitative analysis of the measurement accuracy and software based methods to enhance the measurement accuracy is also presented.

• OSTI ID: 6089363
• Journal Information: IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States), Vol. 8:3; ISSN 0885-8977
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
ELECTRIC MEASURING INSTRUMENTS
ACCURACY
POWER TRANSMISSION LINES
HARMONICS
ELECTRICAL TRANSIENTS
MEASURING METHODS
POWER SUBSTATIONS
TRANSFORMERS
ELECTRICAL EQUIPMENT
EQUIPMENT
MEASURING INSTRUMENTS
OSCILLATIONS
TRANSIENTS
VOLTAGE DROP
240200* - Power System Networks
Transmission & Distribution- (1990-)