CNAIM (version 2.1.4)

pof_cables_04kv_pex: Current Probability of Failure for 0.4kV UG PEX Non Pressurised Cables

Description

This function calculates the current annual probability of failure per kilometer for a 0.4kV Pex non Pressurised cables. The function is a cubic curve that is based on the first three terms of the Taylor series for an exponential function.

Usage

pof_cables_04kv_pex(
  utilisation_pct = "Default",
  operating_voltage_pct = "Default",
  sheath_test = "Default",
  partial_discharge = "Default",
  fault_hist = "Default",
  reliability_factor = "Default",
  age,
  k_value = 0.0658,
  c_value = 1.087,
  normal_expected_life = 80
)

Value

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

Arguments

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").

partial_discharge

String. Only applied for non pressurised cables. Indicating the level of partial discharge. Options: partial_discharge = c("Low", "Medium", "High", "Default").

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.

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).

age

Numeric. The current age in years of the cable.

k_value

Numeric. k_value = 0.0658 by default.

c_value

Numeric. c_value = 1.087 by default. The default value is accordingly to the CNAIM standard see page 110

normal_expected_life

Numeric. normal_expected_life = 80 by default.

Examples

# Current annual probability of failure for 0.4kV non pressurised pex cable, 50 years old
pof_cables_04kv_pex(
utilisation_pct = 80,
operating_voltage_pct = "Default",
sheath_test = "Default",
partial_discharge = "Default",
fault_hist = "Default",
reliability_factor = "Default",
age = 50,
k_value = 0.0658,
c_value = 1.087,
normal_expected_life = 80)