11KV STELMEC Breaker in Vacuum Interrupter working problem so change VI and normal checking, Testing and Maintenance practical vidio.
VI Make:- CGL Type:- WL-33379M3+
In a low voltage circuit breaker, using air or arc chutes is sufficient to extinguish an arc. In the medium voltage range (1000 volts to 38 kV), the main technology used to extinguish an arc is the vacuum interrupter. Vacuum interrupter technology is used for repetitive switching, motor inrush current interruption, fault protection, overcurrent, and short-circuit protection.
The vacuum interrupter is a pair of separable contacts (primary contacts), enclosed in a vacuum-tight envelope. The envelope itself is a ceramic material, with a metal end plate brazed to each end. The metal plates seal the ends and provide support for the parts inside.
Of the two contacts (electrodes) inside, one is fixed. The other is movable, through a bellows-type connection. Various shields inside the envelope provide different types of protection to interrupter parts.
• Circuit breakers - Used in circuit breakers in the most demanding electrical circuit protection applications to minimize damage caused by electrical overloads or short circuits.
• Load break switches - Used in load break switches to connect and disconnect electrical load currents providing limited load switch capacity.
• Reclosers - Used in reclosers to automatically open and close distribution circuits in response to transient overload and fault conditions.
• Contactors - Used in contactors in demanding applications that require a high number of operations switching a power circuit in electric motors, lighting, heating devices, and capacitor banks.
Since the arc is contained within the interrupter, switchgear using vacuum interrupters are very compact compared with switchgear using air, SF6 or oil as arc-suppression medium. Vacuum interrupters can be used for circuit-breakers and load switches. Circuit-breaker vacuum interrupters are primarily used in the power sector in substation and power-generation facilities, and load-switching vacuum interrupters are used for power-grid end users.
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13 окт 2024
