Fault Location in Resonant Grounded Network by Adaptive Control of Neutral-to-Earth Complex Impedance

Wang, Peng; Chen, Baichao; Zhou, Hong; Tian, Cuihua; Sun, Bin

doi:10.1109/tpwrd.2017.2716955

Cited by 52 publications

(34 citation statements)

References 11 publications

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“…Therefore, there is a need to increase this deference level somehow. Reference [20] suggests to connect and control an additional resistor in parallel with the Petersen coil. However, that action may lead to more complexity when it comes to practical implementation.…”

Section: Discussionmentioning

confidence: 99%

“…In References [17][18][19][20], earth fault location using zero sequence components is proposed. Despite the simplicity this approach offers, it suffers from a shortcoming i.e., false indication in networks where the length of the faulty feeder is long and the fault occurs close to the beginning of the feeder.…”

Section: Introductionmentioning

confidence: 99%

“…Despite the simplicity this approach offers, it suffers from a shortcoming i.e., false indication in networks where the length of the faulty feeder is long and the fault occurs close to the beginning of the feeder. In addition, this method in the manner proposed in Reference [20], when applied to compensated networks, requires connection and disconnection of the resistor in parallel with the Petersen coil in the right time, which could cause complexity.…”

Section: Introductionmentioning

confidence: 99%

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Earth Fault Location Using Negative Sequence Currents

2019

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In this paper, a new method for locating single-phase earth faults on non-effectively earthed medium voltage distribution networks is proposed. The method requires only current measurements and is based on the analysis of the negative sequence components of the currents measured at secondary substations along medium voltage (MV) distribution feeders. The theory behind the proposed method is discussed in depth. The proposed method is examined by simulations, which are carried out for different types of networks. The results validate the effectiveness of the method in locating single-phase earth faults. In addition, some aspects of practical implementation are discussed. A brief comparative analysis is conducted between the behaviors of negative and zero sequence currents along a faulty feeder. The results reveal a considerably higher stability level of the negative sequence current over that of the zero sequence current.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Earth Fault Location Using Negative Sequence Currents

2019

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“…On the study of zero-sequence network of the neutral noneffectively grounded systems, there is no necessary to consider the effect of loads [25]. Furthermore, the primary sides of DG transformers are ungrounded [4], hence the zero-sequence circuit of the distribution networks with DGs are the same as that without DGs.…”

Section: A Phase-frequency Characteristics Of the Distribution Feedersmentioning

confidence: 99%

Location of Single Phase to Ground Faults in Distribution Networks Based on Synchronous Transients Energy Analysis

Wang

Zhang

Shi

et al. 2020

IEEE Trans. Smart Grid

112

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As a result of small fault current, high level of noise and a large penetration of distributed generators (DG), in the neutral non-effectively grounded medium-voltage (MV) distribution networks, it is quite difficult to locate the faulted line section for single phase to ground faults. In this paper, using a technique based on synchronized measurements in distribution networks, a fault location method based on the analysis of the energy of the transient zero-sequence current in the selected frequency band (SFB) is proposed. The equivalent impedance of the distribution network with lateral branches is studied with an equivalent network, and the phase-frequency characteristics of the equivalent impedance are analyzed. The SFB, within which the transient energy of the faulty line section is larger than that of the healthy line sections is determined. A combined fault-section location criterion is proposed and the implementation scheme is illustrated with the distribution level phasor measurement units. Numerical simulations of the IEEE 34 node system and the field experiments of a 10kV distribution network validate the feasibility and effectiveness of the proposed method.Index Terms--Active distribution networks, fault location, neutral non-effectively grounded system, single phase to ground faults, transient zero-sequence current.

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“…To avoid detecting fault current, Peng et al [17] and Wang et al . [18] proposed an electromagnetic hybrid Petersen coil, which can control the busbar voltage to zero by a magnetically controlled reactor and an inverter. Wang et al [3, 19] proposed an arc suppression method base on controlling busbar voltage to zero through an inverter without any reactors.…”

Section: Introductionmentioning

confidence: 99%