NDLI: Temporary overvoltages in high-voltage power systems caused by breaks of circuit continuity during single-phase earth faults

Content Provider	IET Digital Library
Author	Tarko, Rafal Nowak, Wieslaw Szpyra, Waldemar
Abstract	The main cause of temporary overvoltages is earth faults. The reduction of such overvoltages is achieved by effective earthing of the neutral. It is assumed that the system is effectively earthed if the relative temporary overvoltage values caused by earth faults do not exceed the established limit value of 1.4 pu. It is believed that the effectiveness of earthing will be assured when, for all system conditions, the ratio of the zero-sequence reactance to the positive-sequence reactance is positive and ≤3, and the ratio of zero-sequence resistance to positive-sequence reactance is positive and <1. However, it appears that, despite the fulfilment of these conditions, a single line-to-earth short-circuit can cause overvoltage exceeding by far the value of 1.4 pu. Such a situation may occur for a disturbance in the form of a single-phase break and earth fault in a power system. This article presents models and results of simulation tests, which allowed for a comprehensive description of those disturbances both in idealised and real systems. Furthermore, the authors suggest solutions to mitigate those severe overvoltages.
Starting Page	628
Ending Page	634
Page Count	7
ISSN	17518687
Volume Number	14
e-ISSN	17518695
Issue Number	Issue 4, Feb (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/14/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2019.1688
Journal	IET Generation, Transmission & Distribution
Publisher Date	2019-12-06
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Earth Fault Earthing Effective Earthing Established Limit Value Fault Location High-voltage Power System Idealised System Line-to-earth Short-circuit Overvoltage Overvoltage Protection Positive-sequence Reactance Power System Power System Fault Power System Protection Power Transformer Real System Relative Temporary Overvoltage Value Severe Overvoltages Single-phase Break Single-phase Earth Fault System Condition Temporary Overvoltages Transformer And Reactors Zero-sequence Reactance Zero-sequence Resistance
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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