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used to have a selective protection scheme, for example in case of parallel distribution
lines or power transformers fed by the same single source.In ring connected supply
feeders between substations or feeders with two feeding sources, 67/51P, 67/50P is also
used.
Parallel lines or transformers
When the lines are connected in parallel and if a fault occurs in one of the lines, it is
practical to have 67/51P, 67/50P to detect the direction of the fault. Otherwise, there is a
risk that the fault situation in one part of the feeding system can de-energize the whole
system connected to the LV side.
GUID-E92DF9EA-D7AD-4866-B426-08533D5E2973-ANSI V1 EN
Figure 123:
Overcurrent protection of parallel lines using directional protection relays
67/51P, 67/50P can be used for parallel operating transformer applications. In these
applications, there is a possibility that the fault current can also be fed from the LV-side
up to the HV-side. Therefore, the transformer is also equipped with directional
overcurrent protection.
Section 4
1MAC059074-MB A
Protection functions
248
615 series ANSI
Technical Manual
Содержание Relion 615 series
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