NDLI: Transient inrush current detection and classification in 230 kV shunt capacitor bank switching under various transient-mitigation methods based on discrete wavelet transform

Content Provider	IET Digital Library
Author	Patcharoen, Theerasak Ngaopitakkul, Atthapol
Abstract	To avoid the failure of instantaneous overcurrent relays (50) owing to fails triggered by transient inrush currents during capacitor-bank switching, this study describes a new approach to detect and classify high-transient inrush current. These currents are due to the energisation of a shunt capacitor bank, rated 4 × 72 Mvar/230 kV, in a substation system in Thailand. The simulation tool power systems computer-aided design (PSCAD) is used to simulate the transient inrush current using six transient-mitigation methods, i.e. (i) a base case, (ii) a pre-insertion resistor, (iii) a pre-insertion inductor, (iv) a current-limiting reactor, (v) a series 6% reactor and (vi) synchronous closing control. Inrush current signals from PSCAD were used as inputs for discrete wavelet transforms. On a scale from 1 to 30, the maximum value of the wavelet coefficient is used to detect the inrush current. The high value of the standard deviation of the wavelet-scale analysis is used to discriminate between the high transient inrush current and the normal capacitor rate current. The results obtained show that the newly proposed method effectively detects and discriminates the capacitor switching inrush current, both isolated and back-to-back switching, with high accuracy.
Starting Page	3718
Ending Page	3725
Page Count	8
ISSN	17518687
Volume Number	12
e-ISSN	17518695
Issue Number	Issue 15, Aug (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/12/15
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2018.0018
Journal	IET Generation, Transmission & Distribution
Publisher Date	2018-05-04
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Back-to-back Switching Capacitor Switching Control of Electric Power System Current-limiting Reactor Discrete Wavelet Transform Electromagnetic Transient Design Failure Analysis High-voltage Substation Shunt Capacitor Bank Inrush Current Signal Integral Transforms Normal Capacitor Rate Current Other Power Apparatus And Electric Machine Overcurrent Protection Overcurrent Relay Power System Computer-aided Design Power System Protection Pre-insertion Inductor Pre-insertion Resistor Protective Relay PSCAD Reactive Power 230 MVAr Relay Protection Reliability Series Reactor Shunt Capacitor Bank Switching Signal Classification Signal Detection Signal Processing Theory Standard Deviation Substation Protection Substations Synchronous Closing Control Thailand Transient Analysis Transient Inrush Current Classification Transient Inrush Current Detection Transient-mitigation Method Voltage 230 KV Wavelet Coefficient Wavelet-scale Analysis
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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