making available required standard type parameters

CHANGELOG.rst

@@ -8,6 +8,7 @@ Change Log
 - [ADDED] converter for European EHV grid data from JAO, the "Single Allocation Platform (SAP) for all European Transmission System Operators (TSOs) that operate in accordance to EU legislation"
 - [ADDED] Add GeographicalRegion and SubGeographicalRegion names and ids to bus df in cim converter
 - [CHANGED] Capitalize first letter of columns busbar_id, busbar_name and substation_id in bus df for cim converter
+- [CHANGED] required standard type parameters are made available by function :code:`required_std_type_parameters()`
 - [FIXED] Do not modify pandas options when importing pandapower
 - [FIXED] fixed copy-paste error in contingency results "max_limit_nminus1" and "min_limit_nminus1"
 - [ADDED] improved lightsim2grid documentation including compatibitliy issues

pandapower/std_types.py

@@ -15,6 +15,26 @@
 logger = logging.getLogger(__name__)
 
 
+def required_std_type_parameters(element="line"):
+    if element == "line":
+        required = ["c_nf_per_km", "r_ohm_per_km", "x_ohm_per_km", "max_i_ka"]
+    elif element == "line_dc":
+        required = ["r_ohm_per_km","max_i_ka"]
+    elif element == "trafo":
+        required = ["sn_mva", "vn_hv_kv", "vn_lv_kv", "vk_percent", "vkr_percent",
+                    "pfe_kw", "i0_percent", "shift_degree"]
+    elif element == "trafo3w":
+        required = ["sn_hv_mva", "sn_mv_mva", "sn_lv_mva", "vn_hv_kv", "vn_mv_kv", "vn_lv_kv",
+                    "vk_hv_percent", "vk_mv_percent", "vk_lv_percent", "vkr_hv_percent",
+                    "vkr_mv_percent", "vkr_lv_percent", "pfe_kw", "i0_percent", "shift_mv_degree",
+                    "shift_lv_degree"]
+    elif element == "fuse":
+        required = ["fuse_type", "i_rated_a"]
+    else:
+        raise ValueError("Unkown element type %s" % element)
+    return required
+
+
 def create_std_type(net, data, name, element="line", overwrite=True, check_required=True):
     """
     Creates type data in the type database. The parameters that are used for
@@ -79,25 +99,9 @@
         raise UserWarning("type data has to be given as a dictionary of parameters")
 
     if check_required:
-        if element == "line":
-            required = ["c_nf_per_km", "r_ohm_per_km", "x_ohm_per_km", "max_i_ka"]
-        elif element == "line_dc":
-            required = ["r_ohm_per_km","max_i_ka"]
-        elif element == "trafo":
-            required = ["sn_mva", "vn_hv_kv", "vn_lv_kv", "vk_percent", "vkr_percent",
-                        "pfe_kw", "i0_percent", "shift_degree"]
-        elif element == "trafo3w":
-            required = ["sn_hv_mva", "sn_mv_mva", "sn_lv_mva", "vn_hv_kv", "vn_mv_kv", "vn_lv_kv",
-                        "vk_hv_percent", "vk_mv_percent", "vk_lv_percent", "vkr_hv_percent",
-                        "vkr_mv_percent", "vkr_lv_percent", "pfe_kw", "i0_percent", "shift_mv_degree",
-                        "shift_lv_degree"]
-        elif element == "fuse":
-            required = ["fuse_type", "i_rated_a"]
-        else:
-            raise ValueError("Unkown element type %s" % element)
-        for par in required:
-            if par not in data:
-                raise UserWarning("%s is required as %s type parameter" % (par, element))
+        missing = [par for par in required_std_type_parameters(element) if par not in data]
+        if len(missing):
+            raise UserWarning("%s are required as %s type parameters." % (missing, element))
     library = net.std_types[element]
     if overwrite or not (name in library):
         library.update({name: data})