Capacitor switching and transformer transients

Bayless, R.S.; Selman, J.D.; Truax, D.E.; Reid, W. E.

doi:10.1109/61.4263

Cited by 38 publications

(6 citation statements)

References 5 publications

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“…2, and the indicated input impedances (4) (5) with representing the time delay of the entire feeder. It should be noted that .…”

Section: Methods Of Analysis and Sample Resultsmentioning

confidence: 99%

“…Hence, they may be switched on and off several times during a typical day. These switching actions will be accompanied by transient voltage stresses that may compromise the supply quality at several load points [3]- [5]. This issue is gaining more importance due to the increasing percentage of personal computers, television sets, and other sensitive solid-state electronic loads in the distribution networks.…”

Section: Introductionmentioning

confidence: 98%

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Capacitor Switching Transients: Analysis and Proposed Technique for Identifying Capacitor Size and Location

Saied

2004

IEEE Trans. Power Delivery

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This paper deals with the analysis of transients initiated by the switching of shunt capacitors in power networks. These transients will propagate through the network along the transmission elements and will, accordingly, be felt at other locations far from the capacitors, such as load terminals. This can lead to adverse effects on the supply quality at those load buses. Based on a typical radial system, the distributed-parameter analysis will give analytical expressions for the expected transient voltages at the load terminals in terms of both the size and location of the switched capacitor. In its second part, this paper presents simple closed-form expressions for the accurate identification of the shunt capacitor's size and location, in terms of easily measurable parameters of the voltage signal at the load terminals.

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“…2, and the indicated input impedances (4) (5) with representing the time delay of the entire feeder. It should be noted that .…”

Section: Methods Of Analysis and Sample Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Capacitor Switching Transients: Analysis and Proposed Technique for Identifying Capacitor Size and Location

Saied

2004

IEEE Trans. Power Delivery

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“…Accuracy in the estimation of the transformer equivalent circuit parameters, and in the presentation of transformer nonlinearities, is essential, due to the direct influence of some transient conditions such as inrush current and ferroresonance on the simulation. 30,31 Table 1 shows the data on the transformer nameplate.…”

Section: Identification Of Test Transformer Parametersmentioning

confidence: 99%

Modified method for transformer magnetizing characteristic computation and point‐on‐wave control switching for inrush current mitigation

Yahiou

Bayadi

Babes

2019

Circuit Theory & Apps

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Summary This paper proposes a new model for the low‐frequency transient analysis of a transformer, with a modified equation for calculation of the flux‐current characteristic representing the saturation inductance of the transformer. The model is based on the V‐I (voltage‐current) no‐load curves and uses the no‐load reactive power losses. To validate the model, it was used to simulate the no‐load magnetizing current in steady‐state condition, as well as the transient inrush current at network frequency. Evaluation was done both by comparing the simulation results obtained with the proposed model and those available in the relevant literature, and by practical measurements. The experimental results presented in this paper were obtained via a laboratory setup and a data acquisition system based on the dSPACE board 1104. Moreover, a control switching to mitigate the transient inrush current in a transformer was developed and applied experimentally in the laboratory and also in the simulations. This control strategy was performed by taking into account the residual flux at the opening instant of the related circuit breaker. A comparative study was carried out showing the validity of the proposed model and the mitigation technique.

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“…These capacitors are being applied to increase power transfer capability, reduce equipment loading, reduce energy costs and control system voltage. Switching these capacitors causes transient voltages that may resonate the utility transformers [1,[12][13]. It has been reported in [12], that two specific transformer failure events due to capacitor bank energization some distance away from the transformers locations.…”

Section: Introductionmentioning

confidence: 99%

“…Switching these capacitors causes transient voltages that may resonate the utility transformers [1,[12][13]. It has been reported in [12], that two specific transformer failure events due to capacitor bank energization some distance away from the transformers locations. Ground faults can be also responsible for transient overvoltage surges, which may be below the surge arrestor level.…”

Section: Introductionmentioning

confidence: 99%

Internal Resonance for Power Transformer Interacted With Cable Transients

Nassar¹,

Taalab²,

Izzularab³

et al. 2019

Yanbu Journal of Engineering and Science

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Power transformers may be subjected to switching surges or fault events that may be responsible for internal transformer resonance. This paper deals with two scenarios of cable-transformer resonance. The first resonance case is due to single-phase earth fault, the second resonance is due to capacitor energization. These two situations lead to excessive transient overvoltages in the secondary side of the power transformer. The effect of various factors on these transient overvoltages is studied. The study is performed on three-phase 155 MVA power transformer. Fast Fourier transform is used for analysis and defining resonance frequencies. Also, phase-plane diagram and discrete wavelet transform are used for internal resonance feature extraction. The results confirm overvoltage occurrence on the low voltage side of power transformer behind cable due to cable-transformer resonance.

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Capacitor switching and transformer transients

Cited by 38 publications

References 5 publications

Capacitor Switching Transients: Analysis and Proposed Technique for Identifying Capacitor Size and Location

Capacitor Switching Transients: Analysis and Proposed Technique for Identifying Capacitor Size and Location

Modified method for transformer magnetizing characteristic computation and point‐on‐wave control switching for inrush current mitigation

Internal Resonance for Power Transformer Interacted With Cable Transients

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