Small-Scale Arc Fault Testing of Medium-Voltage Metal-Enclosed Switchgear

Fjeld, Elin; Hagen, Svein Thore

doi:10.1109/tpwrd.2015.2482002

Cited by 4 publications

(1 citation statement)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It implies that the pressure rise in the container is mainly related to the arc energy under the current experimental conditions, and the impact of the gap length is smaller. However, the increase of arc energy is nearly in linear variation with the initial gap length [26]. The relationship between pressure rise (dp) and arc energy (Qarc) is obtained by the least square curve-fitting method, as shown in Figure 12, which can be expressed as follows: dp = 0.5789 (kPa/kJ)·Qarc (kJ) + 0.8642 (kPa)…”

Section: Relationship Between Pressure Rise and Arc Energymentioning

confidence: 99%

Analysis of Pressure Rise in a Closed Container Due to Internal Arcing

et al. 2017

View full text Add to dashboard Cite

Abstract:When an arc fault occurs in a medium-voltage (MV) metal enclosed switchgear, the arc heats the filling gas, resulting in a pressure rise, which may seriously damage the switchgear, the building it is contained in, or even endanger maintenance personnel. A pressure rise calculation method based on computational fluid dynamics (CFD) has been put forward in this paper. The pressure rise was calculated and the arc tests between the copper electrodes were performed in the container under different gap lengths by the current source. The results show that the calculated pressure rise agrees well with the measurement, and the relative error of the average pressure rise is about 2%. Arc volume has less effect on the pressure distribution in the container. Arc voltage Root-Mean-Square (RMS) has significant randomness with the change of arc current, and increases with the increase of gap length. The average arc voltage gradients measure at about 26, 20 and 16 V/cm when the gap lengths are 5, 10 and 15 cm, respectively. The proportion (thermal transfer coefficient k p ) of the arc energy leading to the pressure rise in the container is about 44.9%. The pressure is symmetrically distributed in the container before the pressure wave reaches the walls and the process of the energy release is similar to an explosion. The maximum overpressure in the corner is increased under the reflection and superimposition effects of the pressure wave, but the pressure waves will be of no importance any longer than a few milliseconds in the closed container.

show abstract

Section: Relationship Between Pressure Rise and Arc Energymentioning

confidence: 99%

Analysis of Pressure Rise in a Closed Container Due to Internal Arcing

et al. 2017

View full text Add to dashboard Cite

show abstract

Influence of buffer volume on the effect of pressure relief for the metal‐enclosed switchgear due to arc fault

Li,

Liu,

Hong

et al. 2024

IET Generation Trans & Dist

View full text Add to dashboard Cite

The explosion accident due to the internal arc fault in the metal‐enclosed switchgear cannot be ignored. Therefore, improving the ability of switchgear to resist the arc fault has important significance. In this paper, a passive protection measure by installing the buffer volume (BV) was proposed. The short‐circuit arcing tests were carried out in the small‐scale switchgear compartments, and the pressure rise was measured in the different models. The changes of pressure rise before and after installing BV were analyzed. Then, the calculation methods of pressure rise in the compartments and the mechanical response of the enclosure were put forward. By calculating the distributions of the pressure rise and temperature rise in the compartments, as well as the time‐varying displacement and stress of the enclosure, the pressure relief effect of the BV has been discussed. Results show that after installing the BV, the pressure rise, displacement, and stress are all decreased obviously in the initial of arcing. Hence, the arc fault protection effect for the switchgear can be improved by properly installing the BV.

show abstract