KPTCL AE/JE case studies
KPTCL AE/JE · Put your knowledge to work in context.
The KPTCL Assistant Engineer (AE) and Junior Engineer (JE) recruitment examination is the entry route into Karnataka Power Transmission Corporation Limited, the state transmission utility. It is intended for engineering graduates and diploma holders who want a career in power transmission, substation operation, and related technical services. The KPTCL AE/JE case studies are 5 cases and about 4,702 words.
111 kV Express Feeder: Tap Change or Tail-End Capacitor?
A 66/11 kV, 5 MVA transformer at a rural substation feeds an 8 km radial 11 kV express feeder serving an irrigation cluster of about 400 pump sets. For planning work the feeder is modelled as a single lumped load at the far end, with per-phase R = 0.27 Ω/km and X = 0.33 Ω/km.
898 words, about 4 min2M25 Raft: Cube Results That Fail the Acceptance Rule
M25 grade concrete for the 900 mm thick raft of a 33/11 kV substation control building was produced from a site batching plant with 53-grade OPC, 20 mm crushed aggregate and river sand, at a designed water–cement ratio of 0.50 and a target slump of 75 mm. The approved mix had a target mean strength of 31.6 N/mm².
993 words, about 5 min3Raw Water Pump Cavitating: Fix Suction or Fit a VFD?
A 45 kW, 1450 rpm centrifugal pump at a raw-water pumping station delivers 180 m³/h against a total head of 45 m, of which about 25 m is static lift to the delivery reservoir and 20 m is friction and fitting loss at rated flow. The pump's NPSHr at this duty is 6.5 m.
892 words, about 4 min4Adding a 12 km Spur and Upgrading to STM-4 on a Fibre Link
The SCADA backbone of a transmission utility uses a 46 km point-to-point single-mode fibre link at 1310 nm between a 220/66 kV grid substation and the load dispatch centre, carrying STM-1 (155.52 Mbps). Recorded design data: fibre attenuation 0.35 dB/km, ten fusion splices at 0.10 dB each, two connector pairs at 0.5 dB each, transmitter output +2 dBm from an FP laser with 2 nm spectral width, receiver sensitivity −30 dBm at 155 Mbps and −28 dBm at 622 Mbps, receiver overload at −8 dBm.
972 words, about 5 min5Ten-Day Shutdown Window with One Crew and Two Blocked Days
One line crew is available at a 110 kV substation for a ten-day window, Days 1 to 10, and five shutdown jobs are pending: P (2 days), Q (1 day), R (3 days), S (2 days) and T (1 day). Constraints are: R must be completed before S starts; P must be over before Day 5 to satisfy a fertilizer consumer's supply agreement; no shutdown of any kind is permitted on Days 6 and 7 because of a local festival and a planned 220 kV bus outage; and the crew can work on only one job at a time.
947 words, about 5 min