Scope: The radial path from the 345kV Kintigh connection through 89-H1, 52-H1, XFMR T1 and 89-B1 to 34.5kV Main Bus 1, then out through feeder bay F1 (89-F1, 52-F1, 89-F1.A) to MV Circuit No. 01.. This is the main interconnection path for one representative collector circuit. The other feeder bays are identical and are modelled the same way.
Boundary: Source = the 345kV overhead connection to Kintigh Substation. Sink = 34.5kV MV Circuit No. 01.. The grid tie point and the collector-circuit point are the two ends of this substation's main function as drawn on this sheet. Beyond them, the collector system is on drawing PV-E.02.01 and the grid is at Kintigh.
Can fail: line, disconnector, breaker, transformer, busbar. These are the series power-carrying primary equipment on the path. The grid source and the collector-circuit sink are boundary points and are treated as perfect. The CT is part of the transformer bushing and is treated as a perfect connector. Surge arresters, CCVTs and meters are shunt or secondary devices and are left out.
Success: any_path. The interconnection works if at least one closed electrical path joins the 345kV grid connection to the collector circuit.
Not modelled:
- Feeders F2, F3 (MV circuits 02-05), the spare 'Space' position and the capacitor-bank bay C1 (CAP-1/CAP-2, GSC-1/2, 52-CS1/2): These are parallel branches off Main Bus 1. Each one serves its own collector or a reactive-support function, so none of them gives an alternative path to MV Circuit 01.
- Station service (89-SS1, SS1, control building, emergency backup): This is auxiliary load, not part of the main power path.
- Surge arresters, CCVT 345CCVT1, VT 35VT1, NGR-1, check meters CM1P/CM1B, grounding switches: These are shunt, protection or metering devices. They do not carry series power current.
- Protection/control failures, kirk-key interlocks, common-cause failures, and the direction of power flow: A connectivity-only cut-set model cannot represent them. Solar generation actually exports power toward the grid, but connectivity is the same in both directions.