Single line diagrams of 220kv-66kv-11kv transmission-DG 0131 and 0131A

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Click to download PDF  —> sld_substation

Above PDF contains two SLDs of substations (220kV into 400V). Below are screen shots.


Single line diagram
Single line diagram 0131

In the right corner of the image, we can see a SLD of 11kv to 400 v step down. This is frequently asked in interviews. In India generating voltage is 11 kV mostly, but 6.6 kV or 33 kV generation also likely possible.




Single line diagram 0131A

In dg 0131A, we used (i) Bus Bar – 220 kV double bus bar, 66 kV double bus bar, 11 kv Bus, (ii) Incoming – 2 X incoming 220 kV, 5 X Outgoing 66 kV, 1 X outgoing 11kV. (iii) 2 X 100 MVA 3 winding  220/66/11 transformers 3 phase (iv) CT, PT, LA, Wave traps, coupling capacitor, fuse/CB, isolators.


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