pof_transformer_132kv: Current Probability of Failure for 132kv Transformers

View source: R/pof_transformer_132kv.R

pof_transformer_132kvR Documentation

Current Probability of Failure for 132kv Transformers

Description

This function calculates the current annual probability of failure for 132kv 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).

Usage

pof_transformer_132kv(
  transformer_type = "132kV Transformer (GM)",
  year_of_manufacture,
  utilisation_pct = "Default",
  no_taps = "Default",
  placement = "Default",
  altitude_m = "Default",
  distance_from_coast_km = "Default",
  corrosion_category_index = "Default",
  age_tf,
  age_tc,
  partial_discharge_tf = "Default",
  partial_discharge_tc = "Default",
  temperature_reading = "Default",
  main_tank = "Default",
  coolers_radiator = "Default",
  bushings = "Default",
  kiosk = "Default",
  cable_boxes = "Default",
  external_tap = "Default",
  internal_tap = "Default",
  mechnism_cond = "Default",
  diverter_contacts = "Default",
  diverter_braids = "Default",
  moisture = "Default",
  acidity = "Default",
  bd_strength = "Default",
  hydrogen = "Default",
  methane = "Default",
  ethylene = "Default",
  ethane = "Default",
  acetylene = "Default",
  hydrogen_pre = "Default",
  methane_pre = "Default",
  ethylene_pre = "Default",
  ethane_pre = "Default",
  acetylene_pre = "Default",
  furfuraldehyde = "Default",
  reliability_factor = "Default"
)

Arguments

transformer_type

String. A sting that refers to the specific asset category. See See page 17, table 1 in CNAIM (2021). Options: transformer_type = c("132kV Transformer (GM)"

year_of_manufacture

Numeric. Normal expected life depends on the year for manufacture, see page 107 table 20 in CNAIM (2021).

utilisation_pct

Numeric. The max percentage of utilisation under normal operating conditions.

no_taps

Numeric. Average number of daily taps (tapchanger).

placement

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.

altitude_m

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.

distance_from_coast_km

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.

corrosion_category_index

Integer. Specify the corrosion index category, 1-5.

age_tf

Numeric. The current age in years of the transformer.

age_tc

Numeric. The current age in years of the tapchanger

partial_discharge_tf

String. Indicating the level of partial discharge in the transformer. Options: partial_discharge_tf = c("Low", "Medium", "High (Not Confirmed)", "High (Confirmed)", "Default"). See page 155, table 176 in CNAIM (2021).

partial_discharge_tc

String. Indicating the level of partial discharge in the tapchanger Options: partial_discharge_tc = c("Low", "Medium", "High (Not Confirmed)", "High (Confirmed)", "Default"). See page 156, table 178 in CNAIM (2021).

temperature_reading

String. Indicating the criticality. Options: temperature_reading = c("Normal", "Moderately High", "Very High", "Default"). See page 155, table 177 in CNAIM (2021).

main_tank

String. Indicating the observed condition of the main tank. Options: main_tank = c("Superficial/minor deterioration", "Some Deterioration", "Substantial Deterioration", "Default"). See page 134, table 93 in CNAIM (2021).

coolers_radiator

String. Indicating the observed condition of the coolers/radiators. Options: coolers_radiator = c("Superficial/minor deterioration", "Some Deterioration", "Substantial Deterioration", "Default"). See page 134, table 94 in CNAIM (2021).

bushings

String. Indicating the observed condition of the bushings. Options: bushings = c("Superficial/minor deterioration", "Some Deterioration", "Substantial Deterioration", "Default"). See page 135, table 95 in CNAIM (2021).

kiosk

String. Indicating the observed condition of the kiosk. Options: kiosk = c("Superficial/minor deterioration", "Some Deterioration", "Substantial Deterioration", "Default"). See page 135, table 96 in CNAIM (2021).

cable_boxes

String. Indicating the observed condition of the cable boxes. Options: cable_boxes = c("No Deterioration","Superficial/minor deterioration", "Some Deterioration", "Substantial Deterioration", "Default"). See page 135, table 97 in CNAIM (2021).

external_tap

String. Indicating the observed external condition of the tapchanger. Options: external_tap = c("Superficial/minor deterioration", "Some Deterioration", "Substantial Deterioration", "Default"). See page 136, table 98 in CNAIM (2021).

internal_tap

String. Indicating the observed internal condition of the tapchanger. Options: internal_tap = c("Superficial/minor deterioration", "Some Deterioration", "Substantial Deterioration", "Default"). See page 136, table 99 in CNAIM (2021).

mechnism_cond

String. Indicating the observed condition of the drive mechnism. Options: mechnism_cond = c("No deterioration", "Superficial/minor deterioration", "Some Deterioration", "Substantial Deterioration", "Default"). See page 136, table 100 in CNAIM (2021).

diverter_contacts

String. Indicating the observed condition of the selector and diverter contacts. Options: diverter_contacts = c("No deterioration", "Superficial/minor deterioration", "Some Deterioration", "Substantial Deterioration", "Default"). See page 136, table 101 in CNAIM (2021).

diverter_braids

String. Indicating the observed condition of the selector and diverter braids. Options: diverter_braids = c("No deterioration", "Superficial/minor deterioration", "Some Deterioration", "Substantial Deterioration", "Default"). See page 136, table 102 in CNAIM (2021)

moisture

Numeric. the amount of moisture given in (ppm) See page 162, table 203 in CNAIM (2021).

acidity

Numeric. the amount of acidicy given in (mg KOH/g) See page 162, table 204 in CNAIM (2021).

bd_strength

Numeric. the amount of breakdown strength given in (kV) See page 162, table 205 in CNAIM (2021).

hydrogen

Numeric. Refers to the hydrogen level in the transformer oil. Hydrogen levels are measured in ppm. A setting of "Default" will result in the best possible result.

methane

Numeric. Refers to the methane level in the transformer oil. Methane levels are measured in ppm. A setting of "Default" will result in the best possible result.

ethylene

Numeric. Refers to the ethylene level in the transformer oil. Ethylene levels are measured in ppm. A setting of "Default" will result in the best possible result.

ethane

Numeric. Refers to the ethane level in the transformer oil. Ethane levels are measured in ppm. A setting of "Default" will result in the best possible result.

acetylene

Numeric. Refers to the acetylene level in the transformer oil. Acetylene levels are measured in ppm. A setting of "Default" will result in the best possible result.

hydrogen_pre

Numeric. Previous results. A setting of "Default" will result in the best possible result.

methane_pre

Numeric. Previous results. A setting of "Default" will result in the best possible result.

ethylene_pre

Numeric. Previous results. A setting of "Default" will result in the best possible result.

ethane_pre

Numeric. Previous results. A setting of "Default" will result in the best possible result.

acetylene_pre

Numeric. Previous results. A setting of "Default" will result in the best possible result.

furfuraldehyde

Numeric. Refers to the furfuraldehyde level in the transformer oil. furfuraldehyde levels are measured in ppm. A setting of "Default" will result in the best possible result.

reliability_factor

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).

Value

DataFrame Current probability of failure per annum per kilometer along with current health score.

Source

DNO Common Network Asset Indices Methodology (CNAIM), Health & Criticality - Version 2.1, 2021: https://www.ofgem.gov.uk/sites/default/files/docs/2021/04/dno_common_network_asset_indices_methodology_v2.1_final_01-04-2021.pdf

Examples

# Current probability of failure for a 132kV transformer
pof_transformer_132kv(transformer_type = "132kV Transformer (GM)",
year_of_manufacture = 1980,
utilisation_pct = "Default",
no_taps = "Default",
placement = "Default",
altitude_m = "Default",
distance_from_coast_km = "Default",
corrosion_category_index = "Default",
age_tf = 43,
age_tc = 43,
partial_discharge_tf = "Default",
partial_discharge_tc = "Default",
temperature_reading = "Default",
main_tank = "Default",
coolers_radiator = "Default",
bushings = "Default",
kiosk = "Default",
cable_boxes = "Default",
external_tap = "Default",
internal_tap = "Default",
mechnism_cond = "Default",
diverter_contacts = "Default",
diverter_braids = "Default",
moisture = "Default",
acidity = "Default",
bd_strength = "Default",
hydrogen = "Default",
methane = "Default",
ethylene = "Default",
ethane = "Default",
acetylene = "Default",
hydrogen_pre = "Default",
methane_pre = "Default",
ethylene_pre = "Default",
ethane_pre = "Default",
acetylene_pre = "Default",
furfuraldehyde = "Default",
reliability_factor = "Default")

CNAIM documentation built on Aug. 31, 2022, 9:13 a.m.