On Site Measurement and Simulation of Transferred Lightning Overvoltages Through Power Transformers

Jurišić, Bruno; Župan, Tomislav; Plišić, Goran; Filipović-Grčić, Božidar; Levačić, Goran; Xémard, Alain

doi:10.1007/978-981-15-5600-5_13

Cited by 2 publications

(8 citation statements)

References 24 publications

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“…Simulated overvoltages consist of lightning strike overvoltage and system response, which is quite complex due to numerous reflections inside the substation and between adjacent substations connected with 110 kV overhead lines. More specifics on modelling can be found in [10]. The amplitude of the simulated overvoltage is comparable to the measured ones while the oscillations following the initial overvoltage differ due to lack of damping in the model.…”

Section: Emtp Simulation Inlcuding High Frequency Transformer Modellingmentioning

confidence: 57%

“…2. Frequency dependent admittance matrix coefficient for a 150 MVA transformer unit [9] Once the model is established, it can be used in EMTP to simulate overvoltages [10]. An example of EMTP simulation of a lightning strike to a 220 kV overhead line tower, which led to flashover in phase B, following by the flashover in phase A, is given below.…”

Section: Emtp Simulation Inlcuding High Frequency Transformer Modellingmentioning

confidence: 99%

“…Overhead lines, busbars and connections inside substation are modelled using frequency dependent line models [12]. Surge arresters are installed in every transformer bay (surge arresters with rated voltage U r =198 kV are installed at 220 kV level and with U r =108 kV at 110 kV level) [11] Once the model is established, it can be used in EMTP to simulate overvoltages [10]. An example of EMTP simulation of a lightning strike to a 220 kV overhead line tower, which led to flashover in phase B, following by the flashover in phase A, is given below.…”

Section: Emtp Simulation Inlcuding High Frequency Transformer Modellingmentioning

confidence: 99%

“…Waveshape of the overvoltages suggest that the fault, following the lighting strike, was double phase to ground fault in phases A and B. Once the model is established, it can be used in EMTP to simulate overvoltages [10]. example of EMTP simulation of a lightning strike to a 220 kV overhead line tower, which to flashover in phase B, following by the flashover in phase A, is given below.…”

Section: Emtp Simulation Inlcuding High Frequency Transformer Modellingmentioning

confidence: 99%

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Integral Approach for Overvoltage Management Based on Field Data and Modelling

Jurišić¹,

Župan²,

Filipović-Grčić³

et al. 2023

joe

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The requirements for the power network to be flexible and to be able to transmit more power are becoming more important as a consequence of high share of the renewables. Therefore, to maintain the level of reliability of the power network, it is necessary to monitor more and more data as well as to better understand the phenomena that might exist in the power system, such as transients. One of the points that are of interest are interaction between power transformer and the other components in the network. A failure of such component may lead to power network unavailability and high economic cost. According to the CIGRE WG A2.37, high portion of the transformer failure may have been caused by the overvoltage. Therefore, it is important to handle overvoltage in the power network with high care. In this paper, an integral approach for power transformer overvoltages management based on field measurements and advanced electromagnetic transients (EMT) modelling is presented. It consists of simulating overvoltages using detailed power network models, including the high frequency transformer models and continuous monitoring of overvoltage events at the places of interest in the power network. This work gives a framework for dealing with overvoltages in the power network that could be implemented by power utilities.

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Section: Emtp Simulation Inlcuding High Frequency Transformer Modellingmentioning

confidence: 57%

Section: Emtp Simulation Inlcuding High Frequency Transformer Modellingmentioning

confidence: 99%

Section: Emtp Simulation Inlcuding High Frequency Transformer Modellingmentioning

confidence: 99%

Section: Emtp Simulation Inlcuding High Frequency Transformer Modellingmentioning

confidence: 99%

See 2 more Smart Citations

Integral Approach for Overvoltage Management Based on Field Data and Modelling

Jurišić¹,

Župan²,

Filipović-Grčić³

et al. 2023

joe

View full text Add to dashboard Cite

show abstract

“…A common approach is to measure voltage transients across the bushing measuring taps of power transformers or reactors [4]. A special bushing tap adapter and measuring impedance need to be designed in order to accurately transfer the overvoltage amplitude and shape to the low voltage side.…”

Section: Transformer Transient Monitoring Systemmentioning

confidence: 99%

Fleet Asset Management Opportunities Arising from Transient Monitoring of Power Transformers and Shunt Reactors

Župan¹,

Jurišić²,

Murat³

et al. 2020

joe

Self Cite

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Power transformers and shunt reactors are strategic assets for every system operator and their downtime should be kept as low and controlled as possible. During their multi-decade service life, they are regularly exposed to transient overvoltages. These situations stress their insulation systems and can cause accelerated deterioration and aging. Since the shapes of these overvoltages are usually unknown, an additional approach to assessing the health index can be realized using monitoring systems with transient recorders. Analyzing the transient overvoltages using frequency domain severity factor, a quantification of additional stress on the transformer’s/shunt reactor’s insulation can be given. This can help in assessing the current state of the insulation system and can lead to more advanced fleet asset management.

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On Site Measurement and Simulation of Transferred Lightning Overvoltages Through Power Transformers

Cited by 2 publications

References 24 publications

Integral Approach for Overvoltage Management Based on Field Data and Modelling

Integral Approach for Overvoltage Management Based on Field Data and Modelling

Fleet Asset Management Opportunities Arising from Transient Monitoring of Power Transformers and Shunt Reactors

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