Classification of Fundamental Ferroresonance, Single Phase-to-Ground and Wire Breakage Over-Voltages in Isolated Neutral Networks

Chen, Lin; Yang, Qing; Wang, Jing; Sima, Wenxia; Yuan, Tao

doi:10.3390/en4091301

Cited by 13 publications

(8 citation statements)

References 14 publications

(14 reference statements)

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“…If the calculation is based on SIM, the recommended frequency scope of the injecting signal should be in the vicinity of the rated frequency. (3). If the calculation is based on RSIM, the recommended frequency scope of the injecting signal should be 30~80 Hz, but the results are not stable and could be affected by the external topology and frequency.…”

Section: Vector Calculation Methods Resultsmentioning

confidence: 99%

“…The magnetic flux Φ ≈ U/(4.44Nf ), where U is external voltage and N is the number of turns of l 0 . The larger the magnetic flux Φ, the deeper the saturation of the iron core [3,25]. Thus, the degree of saturation of the iron core is subject to the influence of external voltage U when the external frequency f is low.…”

Section: Amplitude Calculation Methods Resultsmentioning

confidence: 99%

“…The saturation of iron core at low frequency and the system error due to line stray impedance Z ε in zero sequence at high frequency are the major causes of measurement error. (3). When the injecting transformer is a transformer of small capacity, it is necessary to measure the frequency characteristic of magnetizing impedance for better results.…”

Section: Discussionmentioning

confidence: 99%

“…Self-healing plays an important role in distribution network [2][3][4][5][6][7][8]. The systems, which have been effectively grounding, protect themselves by switching breakers when grounding faults occur.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of Line-to-Ground Capacitance in Distribution Network Considering Magnetizing Impedance’s Frequency Characteristic

et al. 2017

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Abstract:Signal injection method (SIM) is widely applied to the insulation parameters' measurement in distribution network for its convenience and safety. It can be divided into two kinds of patterns: injecting a specific frequency signal or several frequencies' groups, and scanning frequency in a scheduled frequency scope. In order to avoid the disadvantages in related researches, improved signal injection method (ISIM), in which the frequency characteristic of the transformer magnetizing impedance is taken into consideration, is proposed. In addition, optimization for signal injection position has been accomplished, and the corresponding three calculation methods of line-to-ground capacitance has been derived. Calculations are carried out through the vector information (vector calculation method), the amplitude information (amplitude calculation method), the phase information (phase calculation method) of voltage and current in signal injecting port, respectively. The line-to-ground capacitance is represented by lumped parameter capacitances in high-voltage simulation test. Eight different sinusoidal signals are injected into zero-sequence circuit, and then line-to-ground capacitance is calculated with the above-mentioned vector calculation method based on the voltage and the current data of the injecting port. The results obtained by the vector calculation method show that ISIM has a wider application frequency range compared with signal injection method with rated parameters (RSIM) and SIM. The RSIM is calculated with the rated transformer parameters of magnetizing impedance, and the SIM based on the ideal transformer model, and the relative errors of calculation results of ISIM are smaller than that for other methods in general. The six groups of two-frequency set are chosen in a specific scope which is recommended by vector calculation results. Based on ISIM, the line-to-ground capacitance calculations through the amplitude calculation method and phase calculation method are compared, and then its application frequency range, which can work as a guidance for line-to-ground capacitance measurement, is concluded.

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Section: Vector Calculation Methods Resultsmentioning

confidence: 99%

Section: Amplitude Calculation Methods Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Measurement of Line-to-Ground Capacitance in Distribution Network Considering Magnetizing Impedance’s Frequency Characteristic

et al. 2017

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“…Open research that might be applied to the detection and localization of ground faults is described in [14]. Recently, the use of the Wavelet analysis [15][16][17] has achieved excellent results in fault detection.…”

Section: State Of the Artmentioning

confidence: 99%

A Novel Ground Fault Non-Directional Selective Protection Method for Ungrounded Distribution Networks

et al. 2015

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This paper presents a new selective and non-directional protection method to detect ground faults in neutral isolated power systems. The new proposed method is based on the comparison of the rms value of the residual current of all the lines connected to a bus, and it is able to determine the line with ground defect. Additionally, this method can be used for the protection of secondary substation. This protection method avoids the unwanted trips produced by wrong settings or wiring errors, which sometimes occur in the existing directional ground fault protections. This new method has been validated through computer simulations and experimental laboratory tests.

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Simulation and experiment on a flexible control method for ferroresonance

Sima

Yang

et al. 2014

IET Generation, Transmission & Distribution

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Classification of Fundamental Ferroresonance, Single Phase-to-Ground and Wire Breakage Over-Voltages in Isolated Neutral Networks

Cited by 13 publications

References 14 publications

Measurement of Line-to-Ground Capacitance in Distribution Network Considering Magnetizing Impedance’s Frequency Characteristic

Measurement of Line-to-Ground Capacitance in Distribution Network Considering Magnetizing Impedance’s Frequency Characteristic

A Novel Ground Fault Non-Directional Selective Protection Method for Ungrounded Distribution Networks

Simulation and experiment on a flexible control method for ferroresonance

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