| Often there are several reasons for a new substation investment. Thus, when people or business move to a new location, it produces a load growth in the region. However, it might be inefficient to supply new loads with a power from distant substations. If existing substations, even reconstructed, could not provide new loads with a power, the need in new substation will appear. Moreover, a new primary substation construction could bring some benefits in reliability improvement. The main reason for that is reduction of the line length downstream from the circuit breaker. Reliability is usually considerably improved, as the line length per circuit breaker may be cut into a half in many places. | 
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