Convert Name field to string type

src/power_grid_model_io/data_stores/excel_file_store.py

@@ -88,14 +88,19 @@ def load(self) -> TabularData:
 
         def lazy_sheet_loader(xls_file: pd.ExcelFile, xls_sheet_name: str):
             def sheet_loader():
-                sheet_data = xls_file.parse(xls_sheet_name, header=self._header_rows)
+                preview = xls_file.parse(xls_sheet_name, header=self._header_rows, nrows=0)
+                columns = list(preview.columns)
+                dtype = {}
+                for col in columns:
+                    if col == "Name" or (isinstance(col, tuple) and col[0] == "Name"):
+                        dtype[col] = str
+                sheet_data = xls_file.parse(xls_sheet_name, header=self._header_rows, dtype=dtype)
                 sheet_data = self._remove_unnamed_column_placeholders(data=sheet_data)
                 sheet_data = self._handle_duplicate_columns(data=sheet_data, sheet_name=xls_sheet_name)
                 sheet_data = self._process_uuid_columns(data=sheet_data, sheet_name=xls_sheet_name)
                 sheet_data = self._update_column_names(data=sheet_data)
-                return sheet_data
 
-            return sheet_loader
+                return sheet_data
 
         data: Dict[str, LazyDataFrame] = {}
         for name, path in self._file_paths.items():