Cable Temperature Monitoring Research Articles

PMU-Based Cable Temperature Monitoring and Thermal Assessment for Dynamic Line Rating

The aim of this paper is to present a novel phasor measurement unit (PMU) data-based cable temperature monitoring method with an intended application towards facilitating dynamic line rating. First part of the paper presents the method to estimate and track the temperature of a 3-phase cable segment. The benefit of this temperature monitoring method is that no additional temperature measurement sensors are required to be placed along the cable. The method is based on a novel algorithm which gives accurate resistance estimates for 3-phase cable segments even in the presence of random and bias errors in the grid measurements. The performance of the method is demonstrated by utilizing data from PMUs in a distribution grid. The results from the grid data show that the method is capable of monitoring the cable temperature up to an accuracy of ±5 °C. The later part of the paper presents a system to utilize the temperature estimates given by the monitoring method to predict the dynamic thermal state of the cable for forecasted power-flow scenarios. This is demonstrated by using the available temperature estimates to initialize and solve the system of equations given by the thermoelectric equivalent (TEE) model of the cable.

Multi-Sensor Network Cable Tunnel Monitoring System Based on GIS

In this paper, the main factors affect the normal operation of power cables and cable tunnel are introduced. In view of these factors, a multi-sensor network cable tunnel monitoring system based on GIS. In the system, cable temperature monitoring system, tunnel environment monitoring system, tunnel security system and tunnel video monitoring system are embedded in the GIS platform, and the high voltage cable, cable tunnel environment and auxiliary facilities are monitored and controlled, which is of great significance to ensure the stable and safe operation of the cable.

Extending the Functionality of On-line PD Monitoring Equipment for MV Power Cables

An on-line partial discharge (PD) monitoring and location system for medium voltage cable circuits was developed previously. This paper explores ways to extend its range of application. The extension includes PD location method by time domain reflectometry (TDR) when reflections are not easily identifiable. The functionality of the PD monitoring equipment can also be widened by sensing other quantities related to the condition of the cable insulation using the same device. Dynamic cable temperature monitoring can be achieved by recording variation in the high frequency signal propagation velocity along the cable. Water ingress in paper-insulated lead-covered (PILC) cable decreases the cable’s characteristic impedance while it increases the permittivity of the insulation. It can be observed by changes in the reflection pattern from the cable or by a lowered propagation velocity. Instead of recording reflection patterns in time domain, a frequency domain approach based on an impedance scan is investigated to be applied for cables in service.