Journal of Modern Power Systems and Clean Energy

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Home > Archive>Volume 9, Issue 1, 2021 >68-76. DOI:10.35833/MPCE.2019.000095
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Transmission Line Distance Protection Under Current Transformer Saturation
Author:
Affiliation:

1.College of Energy and Electrical Engineering, Hohai University, Nanjing 210098,China;2.State Key Laboratory of Smart Grid Protection and Control, NARI Group Corporation, Nanjing 211106, China;3.Changzhou Institute of Technology, Changzhou 213032, China;4.State Key Laboratory of Smart Grid Protection and Control, NARI Group Corporation, Nanjing 211106, China

Fund Project:

This work was supported by Science and Technology Program of State Grid Corporation of China “Research on Fault Coupling Characteristics and New Protection Principle of AC/DC Hybrid Power Grid”.

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    Abstract:

    Conventional transmission line distance protection approaches are subject to malfunction under reverse fault-induced current transformer (CT) saturation for the typically employed breaker-and-a-half configuration. This paper addresses this issue by proposing a new distance protection approach that combines the blocking and unblocking criteria of distance protection based on the values of incomplete differential current, operation voltage, and current harmonic content. The proposed approach is verified by theoretical analysis, dynamic simulation testing, and field operation to ensure that the obtained distance protection is reliable and refrains from operating unnecessarily under reverse fault-induced CT saturation in the breaker-and-a-half configuration. Meanwhile, the proposed approach is demonstrated can operate reliably when forward faults occur or various reverse faults are converted to forward faults.

    表 7 Table 7
    表 5 Table 5
    表 3 Table 3
    表 4 Table 4
    表 2 Table 2
    表 6 Table 6
    表 1 Table 1
    图1 An example of a substation system with breaker-and-a-half configuration.Fig.1
    图2 Equivalent system with reverse fault at point F in Fig. 1.Fig.2
    图3 Mho action circle with positive-sequence voltage polarization. (a) Transmission of both CT1 and CT2 is normal. (b) CT2 is saturated.Fig.3
    图4 CT2 saturation with reverse fault under operation condition 1.Fig.4
    图5 Schematic diagrams for illustrating additional short-circuit states of substation system with breaker-and-a-half configuration shown in Fig. 1. (a) Forward short-circuit fault. (b) Reverse short-circuit fault.Fig.5
    图6 Operation condition 2: double-circuit lines on the same tower with BRK3 open.Fig.6
    图7 Distribution diagram for reverse fault voltage variation. (a) Forward fault. (b) Reverse fault.Fig.7
    图8 Logic diagram for applying distance protection blocking and unblocking criteria.Fig.8
    图9 RTDS simulation model.Fig.9
    图10 Criterion features during forward and reverse faults. (a) Forward fault. (b) Reverse fault.Fig.10
    图11 Criterion feature in case of reverse fault and CT saturation.Fig.11
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History
  • Received:October 12,2019
  • Online: January 22,2021

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