pof_future_transformer_33_66kv {CNAIM}R Documentation

Future Probability of Failure for 33/10kV and 66/10kV Transformers

Description

This function calculates the future annual probability of failure for 33/10kV and 66/10kV 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 30 in CNAIM (2017).

Usage

pof_future_transformer_33_66kv(
  transformer_type = "66kV 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,
  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",
  simulation_end_year = 100
)

Arguments

transformer_type

String. A sting that refers to the specific asset category. See See page 15, table 1 in CNAIM (2017). Options: transformer_type = c("33kV Transformer (GM)", "66kV Transformer (GM)"). The default setting is transformer_type = "66kV Transformer (GM)"

year_of_manufacture

Numeric. Normal expected life depends on the year for manufacture, see page 103 table 20 in CNAIM (2017).

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 107-108, table 25A in CNAIM (2017) 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 107, table 23 in CNAIM (2017). 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 106, table 22 in CNAIM (2017). 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. corrosion_category_index is used to derive the corrosion category factor. See page 107, table 24 in CNAIM (2017). A setting of "Default" will set the corrosion category factor to 1 independent of asset_type.

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 139, table 162 in CNAIM (2017).

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 140, table 164 in CNAIM (2017).

temperature_reading

String. Indicating the criticality. Options: temperature_reading = c("Normal", "Moderately High", "Very High", "Default"). See page 139, table 163 in CNAIM (2017).

main_tank

String. Indicating the observed condition of the main tank. Options: main_tank = c("Normal Wear", "Some Deterioration", "Substantial Deterioration", "Default"). See page 120, table 74 in CNAIM (2017).

coolers_radiator

String. Indicating the observed condition of the coolers/radiators. Options: coolers_radiator = c("Normal Wear", "Some Deterioration", "Substantial Deterioration", "Default"). See page 120, table 75 in CNAIM (2017).

bushings

String. Indicating the observed condition of the bushings. Options: bushings = c("Normal Wear", "Some Deterioration", "Substantial Deterioration", "Default"). See page 120, table 76 in CNAIM (2017).

kiosk

String. Indicating the observed condition of the kiosk. Options: kiosk = c("Normal Wear", "Some Deterioration", "Substantial Deterioration", "Default"). See page 121, table 77 in CNAIM (2017).

cable_boxes

String. Indicating the observed condition of the cable boxes. Options: cable_boxes = c("Normal Wear", "Some Deterioration", "Substantial Deterioration", "Default"). See page 121, table 78 in CNAIM (2017).

external_tap

String. Indicating the observed external condition of the tapchanger. Options: external_tap = c("Normal Wear", "Some Deterioration", "Substantial Deterioration", "Default"). See page 121, table 79 in CNAIM (2017).

internal_tap

String. Indicating the observed internal condition of the tapchanger. Options: external_tap = c("Normal Wear", "Some Deterioration", "Substantial Deterioration", "Default"). See page 121, table 80 in CNAIM (2017).

mechnism_cond

String. Indicating the observed condition of the drive mechnism. Options: mechnism_cond = c("Normal Wear", "Some Deterioration", "Substantial Deterioration", "Default"). See page 121, table 81 in CNAIM (2017).

diverter_contacts

String. Indicating the observed condition of the selector and diverter contacts. Options: diverter_contacts = c("Normal Wear", "Some Deterioration", "Substantial Deterioration", "Default"). See page 122, table 82 in CNAIM (2017).

diverter_braids

String. Indicating the observed condition of the selector and diverter braids. Options: diverter_braids = c("Normal Wear", "Some Deterioration", "Substantial Deterioration", "Default"). See page 122, table 83 in CNAIM (2017)

moisture

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

acidity

Numeric. Refers to the acidity level in the transformer oil. Acidity levels are measured in (mgKOH/g). A setting of "Default" will result in the best possible result.

bd_strength

Numeric. Refers to the breakdown strength. Breakdown strength is measured in kV. A setting of "Default" will result in the best possible result.

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 69 in CNAIM (2017).

simulation_end_year

Numeric. The last year of simulating probability of failure. Default is 100.

Value

Numeric. Current probability of failure.

Source

DNO Common Network Asset Indices Methodology (CNAIM), Health & Criticality - Version 1.1, 2017: https://www.ofgem.gov.uk/system/files/docs/2017/05/dno_common_network_asset_indices_methodology_v1.1.pdf

Examples

# Future probability of failure for a 66/10kV transformer
pof_future_transformer_33_66kv(transformer_type = "66kV 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",
simulation_end_year = 100)

[Package CNAIM version 1.0.1 Index]