Module 10 : Differential Protection of Bus, Transformer and
This can however involve significant costs, viz the cost of new bus bar and additional circuit breakers to configure a parallel arrangement. Hence, different bus configurations are used in
In electrical distribution systems, a bus tie breaker is used to connect two sections of an electrical bus serving different power sources. Bus tie breakers are usually open, keeping the two sections separate. When one power source fails, the tie breaker can be closed to maintain service through the section, avoiding a planned service outage.
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Double Bus Double Breaker Arrangement Fig 38.3 shows a double bus, double breaker arrangement. As shown in the fig 38.3, each feeder is connected to two buses which in normal operation mode are paralleled. Bus differential protection is provided for each bus. This scheme would be used typically at high voltages like 400kV.
One - and - a - half circuit breaker arrangement the algebraic sum of all during bus fault, the apparatus Fig 38.1 shows the single bus single breaker arrangement. In this particular example, there are six feeders connected to a bus. Each feeder has a CT to monitor feeder current while a single VT is used to measure bus voltage.
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