Self-Blast Current Interruption and Adaption to Medium-Voltage Load Current Switching

Taxt, Henning; Niayesh, Kaveh; Runde, M.

doi:10.1109/tpwrd.2018.2890306

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…In the worst case, the contacts are welded together which is considered as the end of the switch service life. It has been shown that the arc burning between the electrical contacts in both the closing and opening operations has a deteriorating impact on the contacts' erosion [8,9]. In the case of load current interruption, the arc starts burning from the moment the contacts separation.…”

Section: Problem Descriptionmentioning

confidence: 99%

Deconvolution-based correction of pre-strike arc voltage measurement in medium voltage switches

Dorraki,

Niayesh

2024

Meas. Sci. Technol.

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Switching arc characterization, e.g., measuring the arc voltage and current, is crucial for assessing the performance of power switchgears under different working conditions. This is especially challenging for short circuit current making as one of the most severe operations for medium voltage load break switches (MV-LBS). By closing the switch, a short circuit current flows through the arc which is ignited by the electrical breakdown in the gap between contacts before the contacts touch. This results in an abrupt change from the rated voltage of the power network, i.e., tens of thousands of volts, to the switching arc voltage, i.e., a few tens of volts and ultimately zero when the contacts touch. The inherent response of the measurement system to this very large step preceding the arc formation overlaps with the switching arc voltage and results in unrealistic arc voltages which makes correction of the distorted voltage waveform necessary.In this paper, a post processing method based on deconvolution correction technique, i.e. deconvolution of the measured voltage in time and frequency domains, is examined using experimentally determined impulse responses of the measurement system. To demonstrate its effectiveness, this method is applied to three different measurement system configurations with various step responses. The results show practically identical deconvoluted (corrected) voltage waveforms in all three measurement systems, although the directly measured waveforms have significant differences. The corrected arc voltage waveforms are in agreement with the indirect measurements proposed in previous studies.

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Section: Problem Descriptionmentioning

confidence: 99%

Deconvolution-based correction of pre-strike arc voltage measurement in medium voltage switches

Dorraki,

Niayesh

2024

Meas. Sci. Technol.

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“…A solution proposed to help the new gases is to use ablation assisted self-blast nozzles to help extinguish the arc [4]. The working principle of these is the capture of some of the gasses produced by the arc nozzle interactions, a process called ablation.…”

Section: Introductionmentioning

confidence: 99%

Impact of Ablation Based Self Blast Nozzles on Load Break Switch Current Interruption Performance

Roren,

Niayesh

2023

PPT

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In this contribution, SF6 free ablation assisted medium voltage load break switchgear, has been investigated. In these switches, gases generated by the arc polymer interactions are trapped in expansion chambers and are released back onto the arc at the current zero crossing. This increases the current interruption capability of the switch without the use of additional mechanical parts, as opposed to using a puffer to blow on the arc. Existing self-blast research, in medium voltage load break switchgear, has focused on blowing axially or tangentially onto the arc in a cylindrical arcing channel. More geometries are possible. In this paper, alternative self-blast blow-position and the presence of obstructions in the arcing channel have been investigated experimentally and with cold flow simulation. It has been determined that blowing right onto the arc centre is not optimal for cooling the arc, and that the presence of an obstruction in the arc channel is beneficial to arc interruptions.

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“…A number of studies have been performed on interruption performance. Ablation-assisted current interruption and investigation on airflow, contacts, nozzle material and geometries at different switching conditions have been studied to understand the process and find an appropriate design for a successful current interruption for airbased MV-LBS [8][9][10]. In addition to load current interruption, the switch should be able to withstand different fault conditions.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of Short-Circuit Current Making Operation of Air Medium-Voltage Load Break Switches

Dorraki

Niayesh

2022

IEEE Trans. Power Delivery

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Replacing SF6, the most potent greenhouse gas, with an alternative gas is a challenge faced by medium-voltage load break switches (MV-LBS). Air is a possible alternative, but there are some challenges regarding low dielectric strength leading to high arcing time and dissipated energy. Therefore, understanding the switching processes for both interruption and making operations in air MV-LBS is crucial to designing efficient compact switchgear. This work focuses on making operations in air MV-LBS. A synthetic test circuit and a model switch are designed based on the standards to simulate making operations under fault conditions similar to a real test. The test condition is set to achieve high prestrike arcing time and energy. The results show that the most destructive impact of the making short-circuit current occurs in the first half-cycle of the load current when the pre-strike arc is formed. With an average short-circuit current with a peak of 22 kA and a breakdown voltage of 20 kV, the switch failed to re-open due to the arcing contacts welding after four successive making operations without main contacts and seven successive operations with main contacts. It has been shown that the total arcing contact mass loss occurs mainly during the pre-arcing time. Increasing the closing speed could be a possible solution to minimize the impact of arcing. Index Terms-medium voltage (MV), load break switch (LBS), making operations, contacts erosion, arcing contacts, main contacts, arc erosion.

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Self-Blast Current Interruption and Adaption to Medium-Voltage Load Current Switching

Cited by 10 publications

References 14 publications

Deconvolution-based correction of pre-strike arc voltage measurement in medium voltage switches

Deconvolution-based correction of pre-strike arc voltage measurement in medium voltage switches

Impact of Ablation Based Self Blast Nozzles on Load Break Switch Current Interruption Performance

An Experimental Study of Short-Circuit Current Making Operation of Air Medium-Voltage Load Break Switches

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