pof_cables_20_10_04kv {CNAIM}R Documentation

Current Probability of Failure for 20/10/0.4kV cables

Description

This function calculates the current annual probability of failure per kilometer for a 20/10/0.4kV cable. 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_cables_20_10_04kv(
  hv_lv_cable_type = "10-20kV cable, PEX",
  sub_division = "Aluminium sheath - Aluminium conductor",
  utilisation_pct = "Default",
  operating_voltage_pct = "Default",
  sheath_test = "Default",
  partial_discharge = "Default",
  fault_hist = "Default",
  reliability_factor = "Default",
  age
)

Arguments

hv_lv_cable_type

String. A sting that refers to the specific asset category. Options: hv_lv_cable_type = c("10-20kV cable, PEX","10-20kV cable, APB", "0.4kV cable"). The default setting is hv_lv_cable_type = "10-20kV cable, PEX".

sub_division

String. Refers to material the sheath and conductor is made of. Options: sub_division = c("Aluminium sheath - Aluminium conductor", "Aluminium sheath - Copper conductor", "Lead sheath - Aluminium conductor", "Lead sheath - Copper conductor")

utilisation_pct

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

operating_voltage_pct

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

sheath_test

String. Only applied for non pressurised cables. Indicating the state of the sheath. Options: sheath_test = c("Pass", "Failed Minor", "Failed Major", "Default"). See page 141, table 168 in CNAIM (2017).

partial_discharge

String. Only applied for non pressurised cables. Indicating the level of partial discharge. Options: partial_discharge = c("Low", "Medium", "High", "Default"). See page 141, table 169 in CNAIM (2017).

fault_hist

Numeric. Only applied for non pressurised cables. The calculated fault rate for the cable in the period per kilometer. A setting of "No historic faults recorded" indicates no fault. See page 141, table 170 in CNAIM (2017).

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).

age

Numeric. The current age in years of the cable.

Value

Numeric. Current probability of failure per annum for 20/10/0.4kV cables.

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

# Current annual probability of failure for 10-20kV cable, APB, 50 years old
pof_cables_10kV_APB <-
pof_cables_20_10_04kv(hv_lv_cable_type = "10-20kV cable, APB",
sub_division = "Lead sheath - Copper conductor",
utilisation_pct = 80,
operating_voltage_pct = 60,
sheath_test = "Default",
partial_discharge = "Default",
fault_hist = "Default",
reliability_factor = "Default",
age = 50) * 100

paste0(sprintf("Probability of failure %.4f", pof_cables_10kV_APB),
" percent per annum")

[Package CNAIM version 1.0.1 Index]