Red Seal Powerline Technician case studies
Red Seal Powerline Technician · Put your knowledge to work in context.
The Red Seal Powerline Technician credential is the interprovincial recognition awarded to tradespeople who build, maintain and repair overhead and underground electrical distribution systems. It is written for apprentices who have completed the required work-based hours and technical training, and for experienced lineworkers moving between provinces who need their competence formally recognized. The Red Seal Powerline Technician case studies are 5 cases and about 4,973 words.
1Planned Outage With a Customer-Owned Generator on the Tap
You are the lead on a three-person crew replacing a rotten 25 kV Class 4 pole on a 4-wire, multi-grounded-neutral feeder that runs 1.6 km along a river valley. The substation recloser and two air-break switches will be opened for the planned outage.
1,061 words, about 5 min2Ice Storm Corner Pole With a Critical Customer Beyond It
Freezing rain has brought down a three-phase 25 kV tap. Phase C is on the ground in a hay field 40 m from the road, the corner pole at a 60 degree line angle has a broken crossarm and is leaning 15 degrees, and the outside guy, a 3/8 in strand with an 8 in anchor driven 1.2 m, is slack.
1,023 words, about 5 min3Open Delta at an Irrigation Site After a Lightning Failure
A three-phase 240 V, three-wire irrigation site is supplied by three 50 kVA single-phase transformers connected in closed delta on a 25 kV primary. Metered peak demand last season was 105 kVA, and the three 40 hp motors are all started within the same ten minutes each morning.
934 words, about 5 min4Insulator Change on a Slope With a Damaged Conductor
Your two-person crew is to change a chipped 25 kV pin insulator on the center phase of a tangent pole using rubber glove work from an insulated bucket truck. Phase spacing is 1.2 m and the neutral is 0.9 m below the phases; a customer's triplex service drop leaves the same pole another 0.9 m lower.
1,022 words, about 5 min5Riser Fuse Blown on an Old Underground Loop
A 25 kV underground loop serves four padmounted transformers, PMT-1 to PMT-4, from a riser pole; the loop is normally open between PMT-4 and a tie to the east feeder. At 03:00 the 80 A riser fuse blows and all customers beyond PMT-1 lose power; the substation breaker shows no target.
933 words, about 5 min