Related Experiment Video
Updated: Jun 15, 2025
10:52
Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing
Published on: March 8, 2020
5.8K
Failure probability and location identification of damaged insulators using normal function and monitored leakage
Moein Monemi1, Seyed Mohammad Shahrtash1, Mohsen Kalantar1
1Center of Excellence for Power System Automation and Operation, School of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran.
Plos One
|June 11, 2025
Summary
This study proposes using insulator leakage current data and normal distribution to predict electrical insulator failure rates. This method aims to optimize maintenance scheduling and prevent power grid faults by identifying damaged insulators proactively.
Area of Science:
- Electrical Engineering
- Materials Science
- Reliability Engineering
Background:
- Insulators are critical for high-voltage transmission lines, preventing current leakage to towers.
- Degradation of insulators over time leads to failures, causing service disruptions and costly maintenance.
- Current methods for detecting defective insulators are time-consuming and necessitate prolonged power outages.
Purpose of the Study:
- To examine insulator problems and failures across various voltage levels.
- To propose a methodology for determining insulator failure rates for maintenance planning.
- To enable proactive identification and maintenance of damaged electrical insulators.
Main Methods:
- Analysis of insulator leakage current (LC) data.
- Application of normal distribution to model insulator failure rates.
- Calculation of failure probability based on LC measurements.
Main Results:
- A method to calculate the probability of insulator failure using LC data.
- Quantification of insulator failure rates for maintenance prioritization.
- Identification of specific insulators requiring maintenance or replacement.
Conclusions:
- The proposed methodology enables data-driven decision-making for insulator maintenance.
- Predictive maintenance based on LC data can prevent power grid faults.
- Optimized maintenance strategies reduce downtime and improve grid reliability.
Related Concept Videos
01:23Insulation Coordination
125
Insulation coordination is the process of matching electric equipment's insulation strength with protective device characteristics to protect the equipment against expected overvoltages. This selection is based on engineering judgment and cost. Equipment can generally withstand short-duration high transient overvoltages, but repeated tests with identical waveforms can yield inconsistent results. As a result, standard impulse voltage waveforms are used for testing, defined by specific times...
125
01:21Power System Three-Phase Short Circuits
78
Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...
78
01:21Three-Phase Short Circuit—Unloaded Synchronous Machine
132
Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...
132
01:27Line Protection with Impedance Relays
69
Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...
Under normal conditions, low load currents keep the measured...
69
01:22Series R—L Circuit Transients
95
In a series resistor-inductor (R-L) circuit, closing the switch at the start of the time period simulates a three-phase short circuit, a fault condition where all three phases of an unloaded synchronous machine are short-circuited. When there is no fault impedance and no initial current, the initial voltage is determined by the phase angle of the source voltage.
Using Kirchhoff's Voltage Law (KVL) to analyze this circuit helps determine the total asymmetrical fault current, which consists...
Using Kirchhoff's Voltage Law (KVL) to analyze this circuit helps determine the total asymmetrical fault current, which consists...
95
01:18Fault Types
80
When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
For line-to-line faults occurring between phases B and C, the...
For line-to-line faults occurring between phases B and C, the...
80