Variable frequency response testbed to validate protective relays up to 20 kHz

Microgrids operate in islanding or utility grid mode. In islanding mode, distributed energy sources with power electronics inverters can generate fault currents over a wide range of frequencies. To gain a better understanding of the nature of these events, it is crucial to measure currents at freque...

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Bibliographic Details
Published in:Electric power systems research 2021-05, Vol.194, p.107071, Article 107071
Main Authors: Piesciorovsky, Emilio C., Karnowski, Thomas
Format: Article
Language:English
Subjects:
Distributed generation
Electric power distribution
Electric power systems
Electrical equipment
Electricity distribution
Fault diagnosis
Frequencies
Frequency response
Laboratories
Microgrids
Overcurrent
Overcurrent protection
Personal protective equipment
Power distribution protection
Power sources
POWER TRANSMISSION AND DISTRIBUTION
Relay
Relays
Test equipment
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Summary:Microgrids operate in islanding or utility grid mode. In islanding mode, distributed energy sources with power electronics inverters can generate fault currents over a wide range of frequencies. To gain a better understanding of the nature of these events, it is crucial to measure currents at frequencies of up to 20 kHz at transient states with protective relays. Protective relays at these frequency responses should be tested prior to being installed in microgrids. However, testing at high-frequency currents cannot be done with Relay Test Equipment (RTE) that generate signals up to 50th Harmonic for 60 Hz (3 kHz). In this study, a frequency response method and testbed for high-frequency currents of up to 20.16 kHz was developed and tested. The testbed utilized a RTE and High-Frequency Power Source/ Amplifier. Frequency relay experiments were run at frequencies of up to 1 and 20.16 kHz at a current magnitude of 0.1 and 0.5 A, respectively. The events were collected, and the current magnitude and frequency were plotted at time and frequency domain, respectively. The study of current magnitude and frequencies of up to 20.16 kHz for two overcurrent relays was performed and validated the variable frequency testbed and methodology.
ISSN:0378-7796
1873-2046
DOI:10.1016/j.epsr.2021.107071