12/24kV-1250A-31.5kA indoor drawable type embeded pole vacuum circuit breaker(vcb)
Description
VB4 series medium voltage vacuum circuit-breakers with lateral operating mechanism feature the separate pole construction technique.
VB4 vacuum circuit breakers have been designed for indoor use and air insulated switchboards.
Their switching capacity is sufficient to handle any conditions arising from switching of equipment and system components under normal operating and fault conditions, particularly short-circuits, within the parameters of their technical data. The vacuum circuit-breakers of type VB4, designed in column form, can be supplied both as individual units for fixed installation and mounted on chassis. Vacuum circuit-breakers are characterized by their simple and robust construction. They have a long life expectancy. There is no adverse effect on the vacuum, even from frequent switching of operating and short-circuit currents.
Advantages
Vacuum circuit-breakers have particular advantages for use in networks where there is a high switching frequency in the working current range and/ or where a certain number of short- circuit breaking operations are expected. VB4 vacuum circuit-breakers are suitable for auto reclosing and have exceptionally high operating reliability and long life. The circuit- breakers are notable for their compact design, small dimensions together with high capacity. The operating mechanisms have a low maintenance requirement and the interrupters are maintenance- free throughout their service lives. They are well suited to all load breaking operations which occur in practice, and in particular:
Short-circuit currents;
Overhead lines under load and, no-load conditions;
Cables under load and no-load conditions;
Transformers under load and no-load conditions;
Generators under load and no-load conditions;
Ripple control system;
Capacitor banks(also parallel switching) and Motors with starting currents above 600A;
Application
Cable control and protection
Overhead control and protection
Transformers and distribution substations
Motor and transformer control and protection
Generator control and protection
Capacitor bank control and protection
Main characteristics
| Rated voltage1) | kV | 12 | 24 | • / •• / • • / •• / • • / •• / • • / •• / • • / •• / • • / •• / • • / •• / • • / •• / • • / •• / • •• •• | |||
| Rated frequency | Hz | 50 -60 | 50 - 60 | ||||
| Rated normal current | 630...40002) | 630.25 | |||||
| Rated short-circuit breaking current (symm.) | kA | 16.31.5 | 40 | 50 | 63 | 16.31.5 | |
| Rated short-circuit making current | kA | 40.8 | 100 | 1254) | 158 | 40.8 | |
| Rated duration of short-circuit4) | s | 3 | 3 | 3 | 3 | 3 | |
| Fixed- / withdrawable Version | • / • | • / • | • / • | • / - | • / • | ||
| Max. overall dimensions (fixed Version) | mm p H a b c | 150-275 205-310 450-700 424 461-5996) | 210-275 310 570-700 424 5996) | 210-275 310 600-750 459 6088) | 275 310 750 459 677 | 210-275 310 570-700 424 631-661 | |
| Weight | kg | 73-105 | 94-180 | 147-260 | 265 | 100-110 | |
| Embedded Pole | • | • | • | • | |||
| Assembled Pole | • | ||||||
1) Test voltage according IEC62271-100
2) 4000 A with forced cooling
3) 3150 A with forced cooling in APG technology
4) Higher values on request
5) 360 mm for fixed, 280 mm for withdrawable Version
6) Circuit-breaker with heat sink 616 mm
7) Withdrawable Version
8) Circuit-breaker with heat sink 634 mm