Merge pull request #94 from alliander-opensource/bugfix/tap-size-zero

tap_size: all_greater_than_zero -> all_greater_than_or_equal_to_zero

Author: TonyXiang8787

docs/graph-data-model.md

@@ -249,7 +249,7 @@ In this case the winding voltage is decreased if the tap position is increased.*
 | `tap_min` | `int8_t` | - | position of tap changer at minimum voltage                                                                                                                                                                                         | ✔ | ✔ | ❌ | ❌ | |
 | `tap_max` | `int8_t` | - | position of tap changer at maximum voltage                                                                                                                                                                                         | ✔ | ✔ | ❌ | ❌ | |
 | `tap_nom`   | `int8_t` | - | nominal position of tap changer                                                                                                                                                                                                    | &#10060; default zero | &#10004; | &#10060; | &#10060; | `(tap_min <= tap_nom <= tap_max)` or `(tap_min >= tap_nom >= tap_max)` |
-| `tap_size` | `double` | volt (V) | size of each tap of the tap changer                                                                                                                                                                                                | &#10004; | &#10004; | &#10060; | &#10060; | `> 0` |
+| `tap_size` | `double` | volt (V) | size of each tap of the tap changer                                                                                                                                                                                                | &#10004; | &#10004; | &#10060; | &#10060; | `>= 0` |
 | `uk_min` | `double` | - | relative short circuit voltage at minimum tap                                                                                                                                                                                      | &#10060; default same as `uk` | &#10004; | &#10060; | &#10060; | `>= pk_min / sn` and `> 0` and `< 1` |
 | `uk_max` | `double` | - | relative short circuit voltage at maximum tap                                                                                                                                                                                      | &#10060; default same as `uk` | &#10004; | &#10060; | &#10060; | `>= pk_max / sn` and `> 0` and `< 1` |
 | `pk_min` | `double` | watt (W) | short circuit (copper) loss at minimum tap                                                                                                                                                                                         | &#10060; default same as `pk` | &#10004; | &#10060; | &#10060; | `>= 0` |

src/power_grid_model/validation/validation.py

@@ -364,7 +364,7 @@ def validate_transformer(data: InputData) -> List[ValidationError]:
     errors += all_valid_enum_values(data, "transformer", "tap_side", BranchSide)
     errors += all_between_or_at(data, "transformer", "tap_pos", "tap_min", "tap_max")
     errors += all_between_or_at(data, "transformer", "tap_nom", "tap_min", "tap_max")
-    errors += all_greater_than_zero(data, "transformer", "tap_size")
+    errors += all_greater_than_or_equal_to_zero(data, "transformer", "tap_size")
     errors += all_greater_or_equal(data, "transformer", "uk_min", "pk_min/sn")
     errors += all_between(data, "transformer", "uk_min", 0, 1)
     errors += all_greater_or_equal(data, "transformer", "uk_max", "pk_max/sn")

tests/unit/validation/test_input_validation.py

@@ -242,7 +242,7 @@ def test_validate_input_data_sym_calculation(input_data):
     assert NotBetweenOrAtError("transformer", "clock", [1, 14], (0, 12)) in validation_errors
     assert NotBetweenOrAtError("transformer", "tap_pos", [14, 15], ("tap_min", "tap_max")) in validation_errors
     assert NotBetweenOrAtError("transformer", "tap_nom", [1, 15], ("tap_min", "tap_max")) in validation_errors
-    assert NotGreaterThanError("transformer", "tap_size", [14, 15], 0) in validation_errors
+    assert NotGreaterOrEqualError("transformer", "tap_size", [15], 0) in validation_errors
     assert NotGreaterOrEqualError("transformer", "uk_min", [1], "pk_min/sn") in validation_errors
     assert NotBetweenError("transformer", "uk_min", [14], (0, 1)) in validation_errors
     assert NotGreaterOrEqualError("transformer", "uk_max", [1], "pk_max/sn") in validation_errors