This function calculates the current annual probability of failure for 6.6/11kV and 20kV transformers. The function is a cubic curve that is based on the first three terms of the Taylor series for an exponential function. For more information about the probability of failure function see section 6 on page 34 in CNAIM (2021).
pof_transformer_11_20kv(
hv_transformer_type = "6.6/11kV Transformer (GM)",
utilisation_pct = "Default",
placement = "Default",
altitude_m = "Default",
distance_from_coast_km = "Default",
corrosion_category_index = "Default",
age,
partial_discharge = "Default",
temperature_reading = "Default",
observed_condition = "Default",
reliability_factor = "Default",
moisture = "Default",
oil_acidity = "Default",
bd_strength = "Default"
)DataFrame Current probability of failure per annum per kilometer along with current health score.
String. Refers to the high voltage transformer
type the calculation is done for. Options: hv_transformer_type =
c("6.6/11kV Transformer (GM)", "20kV Transformer (GM)"). The default setting
is hv_transformer_type = 6.6/11kV Transformer (GM).
Numeric. The max percentage of utilisation under normal operating conditions.
String. Specify if the asset is located outdoor or indoor.
A setting of "Outdoor" means the asset is
located in an outside environment,
and a setting of "Indoor" means the asset is located in an
indoor environment. A setting of "Default" will result
in either an indoor or an outdoor environment setting that depends
on the specification of asset_type. See page 110-113,
table 26 in CNAIM (2021) for default environments.
Numeric. Specify the altitude location for
the asset measured in meters from sea level.altitude_m
is used to derive the altitude factor. See page 111,
table 23 in CNAIM (2021). A setting of "Default"
will set the altitude factor to 1 independent of asset_type.
Numeric. Specify the distance from the
coast measured in kilometers. distance_from_coast_km is used
to derive the distance from coast factor See page 110,
table 22 in CNAIM (2021). A setting of "Default" will set the
distance from coast factor to 1 independent of asset_type.
Integer. Specify the corrosion index category, 1-5.
Numeric. The current age in years.
String. Indicating the
String. Indicating the criticality.
Options for temperature_reading:
temperature_reading = c("Normal", "Moderately High",
"Very High", "Default"). See page 153, table 172 in CNAIM (2021).
String. Indicating the observed condition of the
transformer. Options for observed_condition:
observed_condition = c("No deterioration", "Superficial/minor deterioration", "Slight deterioration",
"Some Deterioration", "Substantial Deterioration", "Default"). See page 130, table 81 in CNAIM (2021).
Numeric. reliability_factor
shall have a value between 0.6 and 1.5. A setting of "Default"
sets the reliability_factor to 1.
See section 6.14 on page 73 in CNAIM (2021).
Numeric. the amount of moisture given in (ppm) See page 162, table 203 in CNAIM (2021).
Oil Acidity
level of partial discharge. Options for partial_discharge:
partial_discharge = c("Low", "Medium", "High (Not Confirmed)",
"High (Confirmed)", "Default"). See page 153, table 171 in CNAIM (2021).
Numeric. the amount of breakdown strength given in (kV) See page 162, table 205 in CNAIM (2021).
# Current probability of failure for a 6.6/11 kV transformer
pof_transformer_11_20kv(hv_transformer_type = "6.6/11kV Transformer (GM)",
utilisation_pct = "Default",
placement = "Default",
altitude_m = "Default",
distance_from_coast_km = "Default",
corrosion_category_index = "Default",
age = 10,
partial_discharge = "Default",
temperature_reading = "Default",
observed_condition = "Default",
reliability_factor = "Default",
moisture = "Default",
oil_acidity = "Default",
bd_strength = "Default")
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