New method of measuring the zero-sequence distributed parameters of non-full-line parallel four-circuit transmission lines

Hongjiang, Mou; Hu, Zhijian; Gao, Mingxin

doi:10.1016/j.ijepes.2022.108040

Cited by 2 publications

(3 citation statements)

References 18 publications

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“…The interference line length varies with the tested line, changing the tested line length to obtain simulated measurement results for the zero-sequence capacitance, as shown in Table 2. In field measurements, the accuracy classes of instrument transformers are primarily 0.3 and 0.6 [5]. These classes denote measurement errors, indicating that amplitude and phase errors induced by the instrument transformers do not exceed 0.6% and 0.6 degrees, respectively.…”

Section: Tested Linementioning

confidence: 99%

“…Figure 7 displays the measurement results of zero-sequence capacitance errors when there are measurement errors in the voltage and current data at the beginning of the line (with a line length of 300 km designed in the simulation). In field measurements, the accuracy classes of instrument transformers are primarily 0.3 and 0.6 [5]. These classes denote measurement errors, indicating that the amplitude and phase errors induced by the instrument transformers do not exceed 0.6% and 0.6 degrees, respectively.…”

Section: Tested Linementioning

confidence: 99%

“…As society rapidly develops, the demand for electricity continues to increase, and the transmission network is constantly expanding [1]. The reliable determination of line parameters is critical for power flow calculation, short circuit calculation, stability calculation, relay protection and automation device setting calculation and fault location of a power system [2][3][4][5]. Inaccurate parameters can compromise the safety and stability of power system operation and the accuracy of calculation results.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A New Method for Anti-Interference Measurement of Capacitance Parameters of Long-Distance Transmission Lines Based on Harmonic Components

Wang,

Zhang,

et al. 2024

Electronics

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In the context of strong electromagnetic interference environments, the measurement accuracy of the capacitance parameters of transmission lines under power frequency measurement methods is not high. In this paper, a capacitance parameter anti-interference measurement method for transmission lines based on harmonic components is proposed to overcome the impact of power frequency interference. When applying this method, it is first necessary to open-circuit the end of the line under test. Subsequently, apply voltage to the head end of the tested line through a step-up transformer. Due to the saturation of the transformer during no-load conditions, a large number of harmonics are generated, primarily third harmonic. The third harmonic components of voltage and current on the tested transmission line are extracted using the Fourier transform. The proposed method addresses the influence of line distribution effects by establishing a distributed parameter model for long-distance transmission lines. The relevant transmission matrix for the zero-sequence distributed parameters is obtained by combining Laplace transform and similarity transform to solve the transmission line equations. Using synchronous measurement data from the third harmonic components of voltage and current at both ends of the transmission line, combined with the transmission matrix, this method accurately measures the zero-sequence capacitance parameters. The PSCAD/EMTDC simulation results and field test outcomes have demonstrated the feasibility and accuracy of the proposed method for measuring line capacitance parameters under strong electromagnetic interference.

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Section: Tested Linementioning

confidence: 99%

Section: Tested Linementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A New Method for Anti-Interference Measurement of Capacitance Parameters of Long-Distance Transmission Lines Based on Harmonic Components

Wang,

Zhang,

et al. 2024

Electronics

Self Cite

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Fault Identification Technology of 66 kV Transmission Lines Based on Fault Feature Matrix and IPSO-WNN

et al. 2023

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Due to the barely resonant earthed system used in the transmission line, it is more challenging to identify faults at a 66 kV voltage level because of insufficient fault identification techniques. In this paper, a 66 kV transmission line fault identification method based on a fault characteristic matrix and an improved particle swarm optimization (IPSO)-wavelet neural network (WNN) is proposed to address the difficulties in extracting and detecting characteristic parameters. The maximum matrix of the dbN wavelet was used to determine its decomposition scale and construct the fault characteristic matrix based on the energy values of frequency bands. The decomposition scale of the dbN wavelet was determined by the modulus maximum matrix to ensure the integrity of fault information. The fault feature matrix was then constructed based on the energy values of frequency bands and the fault feature was accurately extracted. In this research, aiming at the problems such as slow convergence speed and a tendency to fall into local minima, the WNN algorithm is enhanced with the IPSO algorithm. This significantly increased the convergence speed of the identification model and its ability to discover the global optimal solution. The simulation results demonstrate that this method can effectively and accurately identify the fault type with high identification accuracy, quick identification, and robust adaptability. Under challenging working conditions, it is capable of accurately identifying the fault type of 66 kV transmission lines.

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New method of measuring the zero-sequence distributed parameters of non-full-line parallel four-circuit transmission lines

Cited by 2 publications

References 18 publications

A New Method for Anti-Interference Measurement of Capacitance Parameters of Long-Distance Transmission Lines Based on Harmonic Components

A New Method for Anti-Interference Measurement of Capacitance Parameters of Long-Distance Transmission Lines Based on Harmonic Components

Fault Identification Technology of 66 kV Transmission Lines Based on Fault Feature Matrix and IPSO-WNN

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