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Equivalent traveling waves based current differential protection of EHV/UHV transmission lines

•An ultra-high-speed current traveling wave differential protection for EHV/UHV transmission lines.•The usage of equivalent traveling waves reduces the communication traffic to an appropriate level.•Immunity to synchronization misalignment, current transformer saturation and line capacitive charging...

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Published in:International journal of electrical power & energy systems 2018-04, Vol.97 (C), p.282-289
Main Authors: Lei, Aoyu, Dong, Xinzhou, Shi, Shenxing, Wang, Bin, Terzija, Vladimir
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Language:English
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cited_by cdi_FETCH-LOGICAL-c379t-3a1745db59bf574aa56c4e4f42515d5f99f6b79f42dcb811169d148da1a14efe3
cites cdi_FETCH-LOGICAL-c379t-3a1745db59bf574aa56c4e4f42515d5f99f6b79f42dcb811169d148da1a14efe3
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creator Lei, Aoyu
Dong, Xinzhou
Shi, Shenxing
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description •An ultra-high-speed current traveling wave differential protection for EHV/UHV transmission lines.•The usage of equivalent traveling waves reduces the communication traffic to an appropriate level.•Immunity to synchronization misalignment, current transformer saturation and line capacitive charging current.•Immunity to the limited bandwidth of CCVT, and availability for shunt- and series-compensated lines. Current differential protection is one of the most important primary protections of extra/ultra-high-voltage (EHV/UHV) transmission lines. Despite its wide application, there exist major adverse factors of synchronization misalignment, current transformer (CT) saturation and line capacitive charging current, which may lead to a mal-operation. To solve these problems, a new current differential protection method, based on the concept of equivalent traveling wave (ETW), is proposed. The protection method is immune to CT saturation and line capacitive charging current, operates at an ultra-high speed, and does not require synchronized sampling. In the protection method, wavelet transform modulus maxima (WTMM) are used to reconstruct the current ETWs and thus reduce the communication traffic to an appropriate level. The reconstructed ETWs are then used to establish the percentage restraint operation criterion. Besides, a blocking method is implemented to avoid possible mal-operation when an external fault occurs on a line that forms a parallel path but has no mutual coupling with the protected line. Extensive simulations verify that the proposed protection method can serve as a secure and reliable primary protection for non-, shunt-, or series-compensated transmission lines with high sensitivity, even on internal high-resistance faults.
doi_str_mv 10.1016/j.ijepes.2017.11.017
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Current differential protection is one of the most important primary protections of extra/ultra-high-voltage (EHV/UHV) transmission lines. Despite its wide application, there exist major adverse factors of synchronization misalignment, current transformer (CT) saturation and line capacitive charging current, which may lead to a mal-operation. To solve these problems, a new current differential protection method, based on the concept of equivalent traveling wave (ETW), is proposed. The protection method is immune to CT saturation and line capacitive charging current, operates at an ultra-high speed, and does not require synchronized sampling. In the protection method, wavelet transform modulus maxima (WTMM) are used to reconstruct the current ETWs and thus reduce the communication traffic to an appropriate level. The reconstructed ETWs are then used to establish the percentage restraint operation criterion. Besides, a blocking method is implemented to avoid possible mal-operation when an external fault occurs on a line that forms a parallel path but has no mutual coupling with the protected line. 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Besides, a blocking method is implemented to avoid possible mal-operation when an external fault occurs on a line that forms a parallel path but has no mutual coupling with the protected line. 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Current differential protection is one of the most important primary protections of extra/ultra-high-voltage (EHV/UHV) transmission lines. Despite its wide application, there exist major adverse factors of synchronization misalignment, current transformer (CT) saturation and line capacitive charging current, which may lead to a mal-operation. To solve these problems, a new current differential protection method, based on the concept of equivalent traveling wave (ETW), is proposed. The protection method is immune to CT saturation and line capacitive charging current, operates at an ultra-high speed, and does not require synchronized sampling. In the protection method, wavelet transform modulus maxima (WTMM) are used to reconstruct the current ETWs and thus reduce the communication traffic to an appropriate level. The reconstructed ETWs are then used to establish the percentage restraint operation criterion. Besides, a blocking method is implemented to avoid possible mal-operation when an external fault occurs on a line that forms a parallel path but has no mutual coupling with the protected line. Extensive simulations verify that the proposed protection method can serve as a secure and reliable primary protection for non-, shunt-, or series-compensated transmission lines with high sensitivity, even on internal high-resistance faults.</abstract><cop>United Kingdom</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.ijepes.2017.11.017</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record>
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ispartof International journal of electrical power & energy systems, 2018-04, Vol.97 (C), p.282-289
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1879-3517
language eng
recordid cdi_osti_scitechconnect_1702113
source Elsevier
subjects Current differential protection
Line charging current
Transmission lines
Traveling waves
Wavelet transforms
title Equivalent traveling waves based current differential protection of EHV/UHV transmission lines
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