Reapply "add tap side a c substitution"

nitbharambe · nitbharambe · commit aad98d7c148c · 2025-04-04T11:26:56.000+02:00
This reverts commit 96ade36.
diff --git a/src/power_grid_model_io/config/excel/vision_en_9_8.yaml b/src/power_grid_model_io/config/excel/vision_en_9_8.yaml
@@ -927,6 +927,14 @@ substitutions:
   Tap side:
     1: 0
     2: 1
+  Tap side a:
+    1: 0
+    2: 1
+    3: 2
+  Tap side c:
+    1: 0
+    2: 1
+    3: 2
   Synchronous generators.Q:
     absorb: -1
     supply: 1
