CNAIM (version 1.0.1)

pof_submarine_cables: Current Probability of Failure for Submarine Cables

Description

This function calculates the current annual probability of failure per kilometer for submarine cables. 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_submarine_cables(
  sub_cable_type = "EHV Sub Cable",
  utilisation_pct = "Default",
  operating_voltage_pct = "Default",
  topography = "Default",
  sitution = "Default",
  wind_wave = "Default",
  intensity = "Default",
  landlocked = "no",
  sheath_test = "Default",
  partial_discharge = "Default",
  fault_hist = "Default",
  condition_armour = "Default",
  age,
  reliability_factor = "Default"
)

Arguments

sub_cable_type

String. A sting that refers to the specific asset category. See See page 15, table 1 in CNAIM (2017). Options: sub_cable_type = c("HV Sub Cable", "EHV Sub Cable", "132kV Sub Cable"). The deafult setting is sub_cable_type = "EHV Sub Cable".

utilisation_pct

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

operating_voltage_pct

Numeric. The ratio in percent of operating/design voltage.

topography

String. Describe the topography around the submarine cable. Options: typography = c("Low Detrimental Topography", "Medium Detrimental Topography", "High Detrimental Topography", "Very High Detrimental Topography","Default" )

sitution

String. Descibes how the submarine cable af fixed to the sea floor. Options: sitution=c("Laid on bed", "Covered", "Buried", "Default")

wind_wave

Numeric. Options: wind_wave=c(1, 2, 3, "Default"). Settings:

• wind_wave = 1: Sheltered sea loch, Wind <200 W/m2

• wind_wave = 2: Wave <15kW/m, Wind 200-800 W/m2

• wind_wave = 3: Wave <15kW/m, Wind 200-800 W/m2

• wind_wave = "Default": No data available

intensity

String. Combined wave and current energy factor. Options: intensity=c("Low", "Moderate", "High", "Default").

landlocked

String. Options: landlocked = c("yes","no"). Default setting for landlocked = "no".

sheath_test

String. Indicating the state of the sheath. Options: sheath_test = c("Pass", "Failed Minor", "Failed Major", "Default"). See page 143, table 182 in CNAIM (2017).

partial_discharge

String. Indicating the level of partial discharge. Options: partial_discharge = c("Low", "Medium", "High", "Default"). See page 144, table 183 in CNAIM (2017).

fault_hist

Numeric. The calculated fault rate for the cable per annum per kilometer. A setting of "No historic faults recorded" indicates no fault. See page 144, table 184 in CNAIM (2017).

condition_armour

String. Indicating the external condition of the submarine cables armour. Options: condition_armour = c("Good","Poor","Critical","Default")

age

Numeric. The current age in years of the cable.

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).

Value

Numeric. Current probability of failure per annum per kilometre.

Examples

# NOT RUN {
# Current annual probability of failure for 1 km EHV Sub Cable
pof_subcables <- pof_submarine_cables(
 sub_cable_type = "EHV Sub Cable",
 utilisation_pct = "Default",
 operating_voltage_pct = "Default",
 topography = "Default",
 sitution = "Default",
 wind_wave = "Default",
 intensity = "Default",
 landlocked = "no",
 sheath_test = "Default",
 partial_discharge = "Default",
 fault_hist = "Default",
 condition_armour = "Default",
 age = 10,
 reliability_factor = "Default"
)
paste0(sprintf("Probability of failure %.4f", pof_subcables),
" percent per annum")

# }