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Address: Xianghu Town Jingdezhen City Jiangxi Province China
Contact name:Fei
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TJ-1.14/630 1.14KV 630A vacuum interrupters for AC Contactors
structure type
The ceramic outer casing vacuum interrupter is mainly composed of a
gas-tight insulating shell, a conductive loop, a shielding system,
a contact, a bellows and the like.
working principle
The vacuum interrupter in the vacuum bubble is an electric vacuum
device that utilizes a high vacuum working insulation arc
extinguishing medium to realize the on/off function of the power
circuit by a pair of contacts sealed in a vacuum. When it breaks a
certain value of current, at the moment of separation of the moving
and static contact, the current shrinks to a point where the
contact is just separated, and the resistance between the
electrodes increases sharply and the temperature rapidly increases
until the evaporation of the electrode metal occurs. Extremely high
electric field strength results in extremely strong emission and
gap breakdown, resulting in a vacuum arc. When the power frequency
current approaches zero, it is also an increase in the contact
opening distance. The plasma of the vacuum arc quickly spreads
around. After the arc current crosses zero, the medium in the
contact gap quickly changes from the conductor to the insulator,
and the current is broken. Due to the special configuration of the
contacts, the contact gap during the arcing will produce an
appropriate longitudinal magnetic field. This magnetic field can
evenly distribute the arc on the contact surface, maintaining a low
arc voltage, thus making the vacuum interrupter have a higher arc.
Post-media strength recovery rate, small arc energy and small
corrosion rate. In this way, the ability and service life of the
vacuum interrupter breaking current is increased.
