Voltage Escalation and Reignition Behavior of Vacuum Generator Circuit Breakers During Load Shedding

Glinkowski, M.T.; Gutierrez, M.; Bran, D.

doi:10.1109/mper.1997.560687

Cited by 7 publications

(10 citation statements)

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“…The critical current slope is also a characteristic that depends on the VCB. The research on these characteristics reported by Glinkowski, et al [2] and Glinkowski and Greenwood [3] fully represents the VCB behavior at short gaps up to 1 mm. We analyzed the re-ignition behavior on a simple circuit shown in Fig.…”

Section: A Modeling Re-ignitionsmentioning

confidence: 65%

Improved calculations for no-load transformer switching surges

Popov

Sluis

2001

IEEE Trans. Power Delivery

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Abstract-This paper deals with a modeling of components and calculation of transient overvoltages that build up on the transformer primary terminals after the transformer has been switched off by a vacuum circuit breaker (VCB). The transformer is connected to the circuit breaker by a cable. The transient overvoltages are calculated for different cable lengths, and the cumulative probability of different arc angles is investigated.In this study two cases are considered: transient overvoltages due to steady-state magnetizing current switching, and transient overvoltages due to inrush current switching. It is shown that the case of inrush current switching is worse, as virtual current chopping is possible. The cable is modeled by pi sections, whereas the transformer model is based on a terminal impedance. The VCB re-ignitions are modeled by means of withstand voltage characteristics and high-frequency quenching capability. Due to shortage of field tests, this work uses only literature references to compare the results with actual measurements.

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Section: A Modeling Re-ignitionsmentioning

confidence: 65%

Improved calculations for no-load transformer switching surges

Popov

Sluis

2001

IEEE Trans. Power Delivery

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“…In past years, considering main features of VCBs during operations, several VCB models [17,18] were developed, which mainly differ in the algorithms that control operations of a VCB. According to the requirements of this research, the proposed simulation model of VCB consists of an ideal built-in breaker model in PSCAD/EMTDC and stray components.…”

Section: Modeling Of Vacuum Circuit Breakersmentioning

confidence: 99%

Modeling and Mitigation for High Frequency Switching Transients Due to Energization in Offshore Wind Farms

2016

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This paper presents a comprehensive investigation on high frequency (HF) switching transients due to energization of vacuum circuit breakers (VCBs) in offshore wind farms (OWFs). This research not only concerns the modeling of main components in collector grids of an OWF for transient analysis (including VCBs, wind turbine transformers (WTTs), submarine cables), but also compares the effectiveness between several mainstream switching overvoltage (SOV) protection methods and a new mitigation method called smart choke. In order to accurately reproduce such HF switching transients considering the current chopping, dielectric strength (DS) recovery capability and HF quenching capability of VCBs, three models are developed, i.e., a user-defined VCB model, a HF transformer terminal model and a three-core (TC) frequency dependent model of submarine cables, which are validated through simulations and compared with measurements. Based on the above models and a real OWF configuration, a simulation model is built and several typical switching transient cases are investigated to analyze the switching transient process and phenomena. Subsequently, according to the characteristics of overvoltages, appropriate parameters of SOV mitigation methods are determined to improve their effectiveness. Simulation results indicate that the user-defined VCB model can satisfactorily simulate prestrikes and the proposed component models display HF characteristics, which are consistent with onsite measurement behaviors. Moreover, the employed protection methods can suppress induced SOVs, which have a steep front, a high oscillation frequency and a high amplitude, among which the smart choke presents a preferable HF damping effect.

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“…Thus, it is necessary to consider cable modeling involving wide range frequency instead of a certain power frequency. J.Marti [7] provided a accurate method to model the frequency-dependent transmission lines in electromagnetic transient simulations. The frequencydependent line models are basically distributed RLC traveling wave models, which incorporate the frequency dependence of all parameters.…”

Section: A Cablementioning

confidence: 99%

“…However, the actual operation process of a VCB is more complex than the ideal switching model provided by PSCAD. A new VCB model has been developed using PSCAD, which takes account of the high-frequency current quenching capability, current chopping capability, and dielectric withstand capability [13].…”

Section: Vacuum Circuit Breakermentioning

confidence: 99%

Modeling of transient overvoltages in wind power plants

Liu

Tang

Chen

2014

2014 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

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Compared with conventional power plants, wind power plants (WPP) have their own characteristic, which are more vulnerable to transient overvoltages. Transient overvoltages may contribute to insulation failures of step-up transformers. In WPPs, the transient overvoltage is mainly caused by switching operations of vacuum circuit breakers. In this paper, suitable models for the simulation of transient overvoltages are developed. A detailed model of vacuum circuit breaker, which is required to simulate both the capability of high-frequency current interruption and the withstand capability of transient recovery voltage, is developed. Input parameters for cable models are calculated on the basis of the parameters of actual cables. A wide band transformer model is also proposed for studying the transient behaviors in WPPs. Simulations of transient overvoltages during circuit breaker switching operations in WPP have been carried out in PSCAD/EMTDC. In case studies, it considers some influence factors of transient overvoltages, such as the length of cable feeders and the collector system topology adopted in WPPs. The results obtained from this research can be used as a reference for the insulation level designation of electrical components in WPPs.

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Voltage Escalation and Reignition Behavior of Vacuum Generator Circuit Breakers During Load Shedding

Cited by 7 publications

References 0 publications

Improved calculations for no-load transformer switching surges

Improved calculations for no-load transformer switching surges

Modeling and Mitigation for High Frequency Switching Transients Due to Energization in Offshore Wind Farms

Modeling of transient overvoltages in wind power plants

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