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Gas-filled medium voltage switchgear - avoids excessive pressure increases by setting internal gas pressure to normal air pressure at normal temp.
Gas-filled medium voltage switchgear - avoids excessive pressure increases by setting internal gas pressure to normal air pressure at normal temp.
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机译:充气中压开关设备-通过在正常温度下将内部气压设置为正常气压来避免压力过大。
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摘要
The MV switchgear is designed so that even with no pressure equalising device no excessively large pressures result inside the casing. The pressure of the insulating gas (e.g SF6) inside the switchgear's casing is chosen to lie between 3.945 and 1.03 bar absolute at roughly 20 deg.C. This means that at the max. ambient design temp. of 40 deg.C the pressure inside the casing is roughly 1.1 bar absolute. The preferred pressure inside the casing is 1.013 bar absolute at 20 deg.C, i.e normal air pressure.
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