Prediction model of voltage–time characteristics for SF
            <sub>6</sub>
            long gap under VFTO and lightning impulse voltage

Zhang, Lu; Wang, Sen; Sun, Lei; Mao, Chen; Pu, Liang; Zhang, Qiaogen

doi:10.1049/iet-gtd.2017.0957

Cited by 10 publications

(4 citation statements)

References 22 publications

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“…Extensive research has been carried out in the early stage [22][23][24][25][26], and the model of traction substation and the overhead line system model are mature. The EMU parameters in Figure 5 are combined with the parameters of the Fuxing bullet train to analyze equivalent circuit modeling.…”

Section: Emu Modelmentioning

confidence: 99%

“…To study the voltage and current transients caused by vacuum-circuit breaker switching surges, Refs. [23,24] used ATP-EMTP software to calculate and model a wide-frequency system configuration composed of circuit breakers, cables, transformers, and arresters. Berger et al studied the high-energy switch shock transient fluctuations of fast DC vehicles.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and Experimental Analysis of Overvoltage and Inrush Current Characteristics of the Electric Rail Traction Power Supply System

Sun

Fan

et al. 2022

Energies

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High-speed EMUs (electric multiple-units) frequently pass through the phase-separation zone during operation. Overvoltage generated during the operation of the vehicle-mounted circuit breaker has a long duration and high waveform steepness, which accelerates the service life of the vehicle-mounted equipment and is likely to cause insulation failures. For the above-mentioned problems, the operating overvoltage characteristics of high-speed EMU were obtained by traction substation-catenary-EMUs system (SCES) analysis and experiments, thus deriving the influences of the closed phase angle and the residual magnetism of the vehicle-mounted transformer on operating overvoltage. The results showed that the voltage phase of the catenary significantly affected the operating overvoltage, and the closed switching overvoltage was small at 0–40°, 140–210° and 320–350°. The voltage on the primary side of the vehicle-mounted transformer was 60.78 kV, with the transient impact of high-frequency oscillation overvoltage of 22.71 kV, and an initial period of oscillation of 0.01 ms. Then, the period became longer, and it took 0.5 ms for the high-frequency oscillation from attenuation to disappearance. Finally, a scheme of series reactance suppression devices was proposed to protect vehicle-mounted voltage transformers. This work is to provide data support for the insulation design and system protection of a traction power supply system.

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Section: Emu Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling and Experimental Analysis of Overvoltage and Inrush Current Characteristics of the Electric Rail Traction Power Supply System

Sun

Fan

et al. 2022

Energies

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“…Therefore, almost all power transformers are equipped with anti-VFTO devices, and some of them are equipped with VFTO recording devices, which is costly. The VFTO may be generated by a switch operation of disconnector switch and circuit breaker in the GIS [21], [22]. The amplitude of VFTO is generally less than 2.5 p.u.…”

Section: ) Characteristics Of Vfto-pulsesmentioning

confidence: 99%

A Novel Power Transformer Condition Monitoring System Based on Wide-Band Measurement of Core Earth Signals and Correlation Analysis With Multi-Source Data

Pang²,

Dong

et al. 2019

IEEE Access

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On-line condition monitoring and real-time fault detection are essential to protect power transformers from unscheduled outage of services. The core earth signals (CES) are valuable for fault detection and diagnosis of power transformers, as they are related to multiple transformer defects and faults, such as core multi-point earthing fault and core deep saturation. Moreover, the CES also contain valuable information of transient impulses intruded into power transformers such as very fast transient overvoltage (VFTO) impulses. This paper develops a novel power transformer condition monitoring system (NCMS), which makes full use of CES to detect and diagnose the external impulses and internal defects and faults. Firstly, the NCMS carries out the wide-band measurement of CES. Secondly, the NCMS obtains data from supervisory control and data acquisition system (SCADAS), dissolved gases analysis (DGA) system, and other monitoring systems, and correlates these data using grey relational analysis (GRA). Finally, the NCMS detects the impulses and diagnoses defects and faults based on the correlation relationships, then presents the monitoring results to the users. This novel system has been applied to the field and successfully diagnosed many defects and faults. It has high accuracy (< 3%) at the power and harmonic frequencies and possesses the capability to capture VFTO-pulses. INDEX TERMS Correlation analysis, core earth signal (CES), condition monitoring, industry applications, power transformer, wide-band measurement.

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“…DC gas insulated system has been researched and developed by several power companies including ABB, Toshiba, Siemens etc. SF 6 is widely employed as the gaseous dielectric material in this equipment because of its excellent insulation and arc extinguishing performance [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effects of voltage forms, pressure, and adsorbent on the SF ₆ decomposition characteristics under corona discharge

Zhong¹,

Liu

et al. 2020

IET Science, Measurement & Technology

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Prediction model of voltage–time characteristics for SF ₆ long gap under VFTO and lightning impulse voltage

Cited by 10 publications

References 22 publications

Modeling and Experimental Analysis of Overvoltage and Inrush Current Characteristics of the Electric Rail Traction Power Supply System

Modeling and Experimental Analysis of Overvoltage and Inrush Current Characteristics of the Electric Rail Traction Power Supply System

A Novel Power Transformer Condition Monitoring System Based on Wide-Band Measurement of Core Earth Signals and Correlation Analysis With Multi-Source Data

Effects of voltage forms, pressure, and adsorbent on the SF ₆ decomposition characteristics under corona discharge

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Prediction model of voltage–time characteristics for SF 6 long gap under VFTO and lightning impulse voltage

Cited by 10 publications

References 22 publications

Modeling and Experimental Analysis of Overvoltage and Inrush Current Characteristics of the Electric Rail Traction Power Supply System

Modeling and Experimental Analysis of Overvoltage and Inrush Current Characteristics of the Electric Rail Traction Power Supply System

A Novel Power Transformer Condition Monitoring System Based on Wide-Band Measurement of Core Earth Signals and Correlation Analysis With Multi-Source Data

Effects of voltage forms, pressure, and adsorbent on the SF 6 decomposition characteristics under corona discharge

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Product

Resources

About

Prediction model of voltage–time characteristics for SF ₆ long gap under VFTO and lightning impulse voltage

Effects of voltage forms, pressure, and adsorbent on the SF ₆ decomposition characteristics under corona discharge