March 2015

Having decided the voltage that are required to be created at any substation it is necessary to establish a common insulation level for all items of equipment of each system voltage. It is to be ensured that the breakdown or flashover strength of all insulation (particular voltage) in the station will exceed the selected level. […]

RELIABILITY Is the overall objective in power system design and operation. To be reliable, the power system must be secure most of the time. To be secure, the system must be stable but must also be secure against other contingencies that would not be classified as stability problems e.g., damage to equipment such as an