11kv Pad Mounted Transformer Load Break Switch 3 Phase High Efficiency

11kv load break switch 3 phase load break switch indoor load break switch

11kv load break switch 3 phase load break switch indoor load break switch

Ascending changes in the way we generate, transmit and use of electricity in developed economy or highly industrialised society, prioritised the maintenance of continuity of supply to consumers. With the goal to be integrated in smart cities, the safety of electrical equipment by fast disconnection of the power supply in case of fault events like leakage current, electrical arc, over current or overvoltage is taken care through switchgear such as disconnecting switches, circuit breakers, etc. For the systems up to 33kV, the more costly circuit breakers are getting replaced with load break switches. A load break switch is a type of switching device used for voltages in the range of 12 to 36 kV and must have the following capabilities:

- Interruption of current equal to its continuous current rating at the system voltage and the power factor of the normal load
- Designed to possess enough insulation to isolate the circuit in closed position.
- Interrupting small capacitive and inductive currents which is essential for disconnecting the unloaded overhead lines, transformers, cables, etc.
- Carrying the maximum fault current for the duration required by the interrupting device to clear the fault.
- Making on the terminal fault at rated voltage.

The basic functional difference between Load break switch and circuit breaker is that the former cannot interrupt the short circuit currents. The following figure 1 shows the how the load break switches are employed in a substation.