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Examoogle • User • info@examoogle.com • EE-2024-8821
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Multi gap arrester used up to
11 kV
22 kV
33 kV
66 kV
33 kV
Quick Summary: A multi-gap arrester is a type of lightning arrester designed to protect power equipment from voltage surges. It is typically effective for low-voltage distributions and is historically limited to systems operating up to 33 kV due to its inability to reliably quench power follow-current at higher transmission voltages.
A multi-gap arrester is a type of lightning arrester designed to protect power equipment from voltage surges. It is typically effective for low-voltage distributions and is historically limited to systems operating up to 33 kV due to its inability to reliably quench power follow-current at higher transmission voltages.
Vsparkover≈n×Vgap — where n is the number of gaps and Vgap is the breakdown voltage per gap.
The arrester consists of a series of metallic cylinders separated by small air gaps. When a voltage surge occurs, the air gaps break down, creating a low-impedance path to the ground for the surge current. The multiple gaps help in breaking the arc into smaller segments, which increases the cooling effect and assists in extinguishing the power follow-current as the voltage returns to normal.
Uses multiple series air gaps to handle surge potentials.
Limited effectiveness for high-voltage transmission lines due to arc extinction difficulties.
Primarily used in distribution systems for protection against atmospheric surges.
Requires series resistance to limit the follow-current.
Simple construction and low cost.
Easy to install in distribution networks.
Inefficient at higher voltages.
Difficulty in quenching the power follow-current.
Arc gaps can degrade over time due to weathering.
Distribution transformers
Low voltage distribution lines up to 33 kV
At voltages above 33 kV, valve-type arresters (using non-linear resistors like SiC or ZnO) are preferred because they provide better voltage clamping and arc-quenching properties.
The 11 kV and 22 kV options are technically 'up to' 33 kV, but 33 kV is the upper limit for the application range of this specific device.
C is correct — The multi-gap arrester is restricted to use in systems up to 33 kV because it cannot reliably extinguish the power follow-current at higher operating voltages.
Always remember that as system voltage increases, the requirement for arc-quenching capability becomes more stringent, necessitating a shift from simple gap-based arresters to valve-type or gapless ZnO arresters.