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Abb 33kv Vacuum Circuit Breakers
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Product Price: Rs 3,75,000 / PieceGet Best Price
Minimum Order Quantity: 1 Piece
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Product Details:
Brand
ABB
Rated Impulse Withstand Voltage
75 kV
Rated Current
2500 A
Frequency
50 hz
Poles Number
3 Pole
Phase
Single
Automation Grade
Manual
Model Name/Number
VD4
Warranty
1 year
Mounting Type
panel
Number Of Power Control
3
Rated Frequency
50 - 60 Hz
Rated short Circuit Breaking Current
16 31.5 KA
Max. Overall Dimensions
150 - 275 mm
Rated duration of Short Circuit
3
Rated Voltage
12 kV
In a vacuum interrupter, the electric arc starts at the moment of contact separation and is maintained until zero current and can be influenced by magnetic fields. Vacuum arc – diffuse or contracted Following contact separation, single melting points form over the entire surface of the cathode, producing metal vapours which support the arc. The diffuse vacuum arc is characterised by expansion over the contact surface and by an even distribution of thermal stress on the contact surfaces. At the rated current of the vacuum interrupter, the electric arc is always of the diffuse type. Contact erosion is very limited and the number of current interruptions very high. As the interrupted current value increases (above the rated value), the electric arc tends to be transformed from the diffuse into the contracted type, due to the Hall effect. Starting at the anode, the arc contracts and as the current rises further it tends to become sharply defined. Near the area involved there is an increase in temperature with consequent thermal stress on the contact. To prevent overheating and erosion of the contacts, the arc is kept rotating. With arc rotation it becomes similar to a moving conductor which the current passes through The spiral geometry of ABB vacuum interrupter contacts The special geometry of the spiral contacts generates a radial magnetic field in all areas of the arc column, concentrated over the contact circumferences. An electromagnetic force is self-generated and this acts tangentially, causing rapid arc rotation around the contact axis. This means the arc is forced to rotate and to involve a wider surface than that of a fixed contracted arc. Apart from minimising thermal stress on the contacts, all this makes contact erosion negligible and, above all, allows the interruption process to be controlled even with very high short-circuits. ABB vacuum interrupters are zero-current interrupters and are free of any re-striking. Rapid reduction in the current charge and rapid condensation of the metal vapours simultaneously with the zero current, allows maximum dielectric strength to be restored between the interrupter contacts within microseconds.
