Design, Implementation and Simulation of Non-Intrusive Sensor for On-Line Condition Monitoring of MV Electrical Components

Abstract

Non-intrusive measurement technology is of great interest for the electrical utilities in order to avoid an interruption in the normal operation of the supply network during diagnostics measurements and inspections. Inductively coupled electromagnetic sensing provides a possibility of non-intrusive measurements for online condition monitoring of the electrical components in a Medium Voltage (MV) distribution network. This is accomplished by employing Partial Discharge (PD) activity monitoring, one of the successful methods to assess the working condition of MV components but often requires specialized equipment for carrying out the measurements. In this paper, Rogowski coil sensor is presented as a robust solution for non-intrusive measurements of PD signals. A high frequency prototype of Rogowski coil is designed in the laboratory.Step-by-step approach of constructing the sensor system is presented and performance of its components (coil head, damping component, integrator and data acquisition system) is evaluated using practical and simulated environments. Alternative Transient Program-Electromagnetic Transient Program (ATP-EMTP) is used to analyze the designed model of the Rogowski coil. Real and simulated models of the coil are used to investigate the behavior of Rogowski coil sensor at its different stages of development from a transducer coil to a complete measuring device. Both models are compared to evaluate their accuracy for PD applications. Due to simple design, flexible hardware, and low cost of Rogowski coil, it can be considered as an efficient current measuring device for integrated monitoring applications where a large number of sensors are required to develop an automated online condition monitoring system for a distribution network.

Series Arc Fault Detection Sensor Based on an ABS Rogowski Coil in Medium Voltage

“…Figure 3 shows the Rogowski coil's lumped equivalent circuit, which contains the coil's equivalent resistance, Rc, self-inductance Lc, self-capacitance Cc, and terminal resistance. These values are computable, and should be as low as possible to optimise the dynamic frequency response [25]. From the lumped parameters model, the transfer function H(s) for this model is given by: Figure 3 The RC lumped equivalent circuit for arc fault sensor application [25].…”

“…These values are computable, and should be as low as possible to optimise the dynamic frequency response [25]. From the lumped parameters model, the transfer function H(s) for this model is given by: Figure 3 The RC lumped equivalent circuit for arc fault sensor application [25].…”

A Review on the Classification of Partial Discharges in Medium-Voltage Cables: Detection, Feature Extraction, Artificial Intelligence-Based Classification, and Optimization Techniques

“…One of the main causes of PD is the deterioration of MV cable insulation caused on by TEAM (thermal, electrical, ambient, and mechanical) stresses. If the PD is not properly mitigated, it could result in the failure of critical components, leading to power outages [2].…”

“…Once the PD process is initiated, the insulating materials start to deteriorate gradually. This further causes cracking, ruptures, and electrical treeing in the surrounding insulation and eventually leads to the final breakdown of the insulation [1][2][3].…”