C
calvint
I have two 415V busbars separated by a bus section which is normally open. Busbar 1 and busbar 2 are normally fed separately by transformer 1 and transformer 2 respectively. Both transformer's HV side are from the same 11kV board. Both transformers are of the same manufacturer, model, ratio, tap and vector group.
My present arrangement when carrying out maintenance on either transformer is to first switch off the transformer and its LV board before closing the bus section CB. This causes momentary supply interruption to the loads connected.
Since both transformers are actually identical, can I actually just close the bus section CB first thus temporarily paraleling the transformers before switching OFF the particular transformer I would like to service? Are there any dangers or considerations? Since both are identical I think it should be ok but my colleagues are of a different opinion as this was not the practice before.
Would appreciate any ideas and discussions on this.
My present arrangement when carrying out maintenance on either transformer is to first switch off the transformer and its LV board before closing the bus section CB. This causes momentary supply interruption to the loads connected.
Since both transformers are actually identical, can I actually just close the bus section CB first thus temporarily paraleling the transformers before switching OFF the particular transformer I would like to service? Are there any dangers or considerations? Since both are identical I think it should be ok but my colleagues are of a different opinion as this was not the practice before.
Would appreciate any ideas and discussions on this.