Study on Characteristic Parameters of Short-Circuit Impedance for a Four-Winding Inductive Filtering Transformer in Power System Supplying Nonlinear Loads

Zhao, Huahua; Chen, Yuehui; Shi, Saimei; Luo, Longfu

doi:10.1109/access.2019.2930829

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…The induction filter technology proposed in [11]- [15] is different from the traditional harmonic control scheme. It is based on the magnetic potential balance between the transformer windings.…”

Section: Introductionmentioning

confidence: 99%

Study on Operation Parameter Characteristics of Induction Filter Distribution Transformer in Low-Voltage Distribution Network

Zhang

et al. 2021

IEEE Access

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There is a need for induction filter technology in the field of low-voltage distribution networks. This paper proposes an induction filter distribution transformer with a unique Dd0yn11 threewinding configuration. This approach allows for the control of load side harmonics in low-voltage distribution networks. At present, the induction filter technology proposed in the known literature is mostly used in the high-voltage power system, but there is still no research on the application of induction filter technology to the distribution transformer with Dyn11 under the low-voltage distribution network. In this paper, the wiring scheme of inductive filter distribution transformer and filter system in low-voltage distribution network is established firstly, then the mathematical relationship between the harmonic current generated by the load side and the current on the grid side is derived according to the winding model, and it can be deduced that the induction filter distribution transformer with its filtering system has good filtering performance and reactive power compensation characteristics. Finally, the experiment simulates the threephase harmonic load, detects the current waveform and other parameters of the actual grid side of the new transformer, verifies the correctness of the theoretical analysis. The induction filter distribution transformer proposed in this paper provides a new solution for harmonic suppression and reactive power compensation in low-voltage distribution network, which fills the vacancy of the application of induction filter technology in low-voltage distribution network, This paper reveals that the inductive filter technique has a good filtering performance when applied to low-voltage distribution network. And it provides a reference for further research on improving power grid efficiency, saving energy cost and improving transformer electromagnetic environment under low-voltage distribution network.INDEX TERMS induction filter distribution transformer, low-voltage distribution network, reactive power compensation, suppress the harmonics, electromagnetic environment

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Section: Introductionmentioning

confidence: 99%

Study on Operation Parameter Characteristics of Induction Filter Distribution Transformer in Low-Voltage Distribution Network

Zhang

et al. 2021

IEEE Access

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“…Domestic and foreign scholars have done a lot of research on the detection of transformer winding deformation and formed the following several mature detection methods. The short-circuit impedance method [5][6][7] has been promulgated by the International Electrotechnical Commission (IEC) standards and national standards. By comparing the short-circuit impedance values before and after the transformer winding deformation, it can be judged whether the winding has been deformed or shifted, but the sensitivity to the small deformation of the winding is not high.…”

Section: Introductionmentioning

confidence: 99%

Research on On-Line Detection Method of Transformer Winding Deformation Based on VFTO

Wang

Zhou

Zeng

et al. 2021

Sensors

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At present, the detection of transformer winding deformation faults is carried out in an offline state, which requires the transformer to cooperate with the implementation of planned power outages, or it takes place after the sudden failure of the transformer when it is out of operation. It is difficult to obtain the status information of the windings online in time. Since the transformer will suffer very fast transient overvoltage (VFTO) impact during operation, combined with the principle of the frequency response method, an online detection method of transformer winding deformation based on VFTO is proposed. In order to study the frequency response characteristics of transformer winding under the impact of VFTO, the generation process of VFTO is simulated by simulation software, and the equivalent circuit model of transformer winding before and after deformation is established. The VFTO signal is injected into the transformer circuit model as an excitation source, and the changes of resonant frequencies of frequency response curve under different deformation types and different deformation degrees of winding are analyzed. The simulation results show that the frequency response curves of different winding deformation types are different. Different deformation degrees are simulated by increasing the radial capacitance by 4%, 13%, and 23%, series inductance by 2%, 4%, and 6%, and longitudinal capacitance by 3%, 6%, and 9%, and the change of resonance frequencies can comprehensively reflect the deformation information of winding. At the same time, the tests of different deformation types and deformation degrees of the simulated winding are carried out. The results show that with the deepening of the change degree of the simulated fault inductance value, the frequency response curve shifts to the low-frequency direction, confirming the feasibility of the online detection method of transformer winding deformation based on VFTO.

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“…Frequency response and low voltage pulse method have been widely used in the power industry, they are mainly be tested after the transformer quit operation in actual application [19][20]. Although short circuit reactance method can be used to monitor the winding deformation online [21], it cannot diagnose the early latent fault of winding loosened state. Recently, state monitoring method based on vibration information is becoming one of the research directions in transformer winding monitoring field [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Monitoring Method on Loosened State and Deformational Fault of Transformer Winding Based on Vibration and Reactance Information

Cao

2020

IEEE Access

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In order to monitor loosened state and deformational fault for transformer winding, the monitoring method based on vibration and reactance information is proposed in this paper. Theoretical models of winding deformational state with vibration and reactance information are established and calculated. Multi-information monitoring model is established, which include vibration and reactance information monitoring method. Multi-information integrated monitoring strategy is proposed. The CEEMD-energy entropy transformation method is proposed to extract vibration feature information, and reactance feature information is extracted by reactance identification method. Aiming at a 500kVA, 35kV transformer prototype, experiment of short circuit current impact is carried on, three types of deformational windings including radial extend in middle position, axial stretching loosened and coil folding in end position are developed. Monitoring experiment on loosened state winding after multi-short circuit current impacts and three types of deformational fault windings are carried on. The monitoring results are consistent with the actual deformational state of transformer windings. Loosened state and deformational fault of windings can be monitored by proposed monitoring method based on vibration and reactance information effectively, which provide basis for multi-information monitoring.

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Study on Characteristic Parameters of Short-Circuit Impedance for a Four-Winding Inductive Filtering Transformer in Power System Supplying Nonlinear Loads

Cited by 8 publications

References 21 publications

Study on Operation Parameter Characteristics of Induction Filter Distribution Transformer in Low-Voltage Distribution Network

Study on Operation Parameter Characteristics of Induction Filter Distribution Transformer in Low-Voltage Distribution Network

Research on On-Line Detection Method of Transformer Winding Deformation Based on VFTO

Monitoring Method on Loosened State and Deformational Fault of Transformer Winding Based on Vibration and Reactance Information

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