Power Cable Testing & Fault Location

Course Introduction

Power Cable fault locating and testing takes on a whole new dimension with the modular Cable Fault locating Concept from Megger. We have geared our development to the industry requirements for a more tempered fault locating method and have developed more sophisticated methods that reduce the stress on insulation systems. In absence of CBM, the power or control cable fails without any notice.

To find the fault is a very tedious job and requires a lot of tools and combination of tools and expertise to locate the fault in the cable. Precise fault location can save a lot of money and can reduce the down time for the customers and the power could be restored within the shortest possible time The Electricity Companies have to supply electricity to the consumers at the lowest possible cost commensurate with safety.

Power cables represent a major capital asset for electricity suppliers. While in service power cables must be maintained and monitored in order to anticipate faults and possibility avert any failure. Faults in underground cables can occur at any time, and the causes are many and varied. When faults do occur they generally cause loss of supply to customers and loss of revenue for suppliers. So, it is imperative that the fault location process is efficient and accurate to minimize excavation time, which results in results in reducing the inconvenience to all concerned. For fault locating to be efficient and accurate technical staff needs to have expert knowledge accompanied with experience in order to attained service reliability.

Objectives

By the end of the training, participants will be able to:

• Understand the Essential Characteristics and Requirements of Underground Cables
• Consolidate and updated understating of the Terminology used in Measuring and Analysis
• Provide Methods and devise Solutions to improve Equipments through the prediction and the avoidance of Power Cable Failure
• Use Casual Factor Chart to identify data to be collected produce a Root Cause Map and Identify Root Causes
• Appreciate the Technical Options for Selection, Laying and Maintenance of Power Cables
• Apply practices for Fault Detection and Location for Power Cables and Identify Problems and Failure Modes of Cables
• Perform Routine & Preventative Maintenance and Testing of Power System and Analysis Issues from their workplace implement underlying Concepts.

Training Methodology

This interactive training course includes the following training methodologies as a percentage of the total tuition hours:-

• 30% Lectures, Concepts, Role Play
• 70%  Workshops & Work Presentations, Techniques, Based on Case Studies & Practical Exercises, Software & General Discussions
•  Pre and Post Test

Target Audience

The course is intended for Engineers and highly Technicians from Electrical Power Utilities Companies, Manufactures and Distributors of Power Cables, Engineering Professional in Petrochemical Companies, and Commercial Buildings.

Daily Topics

• Pre-Test
• Introduction to Testing of Cables
  • Life Cycle
  • Test Cycle
  • Routine Tests
  • Special Tests
  • Type Tests
  • Site Tests after Installation Module

• Cable Failures and their Analysis
  • Mechanical Failures  Corrosion of Sheath
  • Moisture in the Insulation
  • Heating of Cables / Heating Resources
  • Fire and Lightning Surges
  • Electrical Puncture
  • Insulation Defects

• Dielectric Losses
  • Dissipation Factor (tan)
  • Cables Measurements
  • Three Conductor Cable Insulation Diagram
  • Loss Measurement of Dissipation Factor
  • Analysis of Cable Measurements Results
  • Tan Instrument (Schering Bridge)
  • Tan Instrument (Latest Technology)

• Very Low Frequency VLF
  • Standard for on-site Testing including VLF
  • Principle of VLF Generator
  • Dissipation Factor (tan)
  • Evaluation of (tan) measurements based on XLPE
  • Water Treeing in Polymeric Insulation
  • Comparison of Electrical Treeing and Water treeing
  • Comparison Channel Growth
  • Simplified Dielectric Equivalent Circuit for New Cables
  • Examples of Water Trees
  • Application of VLF / PD Diagnosis

• Partial Discharge Techniques  What is Partial Discharge?
  • D Detection for Cable Diagnostics  Why Test for Partial Discharge?
  • Physical Background of PD
  • Types of Partial Discharge
  • Characteristic of Discharge Patterns
  • Breakdown Cable Voltage
  • Partial Discharge Test Facility
  • Test Circuit inside Shielded Room
  • How to Calibrate the Partial Discharge System?  How to measure Partial Discharge?
  • Charge in Fault versus measured apparent charge and Measurement Results
  • P D Measurement Methods Available (Test Van)

• Cable Fault Location and Tracing
  • Cable Fault Location Procedures  Cable Fault Types
  • PD Tracks in Slip Joins for Cables
  • Methods of Cable Fault Location
  • Time Domain Reflectometry (TDR)
  • Impulse Reflection Method IRM)
  • Secondary impulse Method (SIM)
  • Multiple Impulse Method (MIM)
  • Fault Distance from Cable End
  • Bridge Method (Wheatstone)
  • Cable Tracing
  • Cable Locator
  • Acoustic Fault Location
  • Propagation Time Measurement
  • Pin Pointing Set
  • Audio Frequency Twist Method
  • Cable Sheath Fault location
  • Cable Test Van

• Benefits of Cable Testing
  • Reduction of in-service cable failures
  • Prioritization of cables in a cable replacement Program Schedules
  • Answers with the ‘repair or replace” question
  • Development of Documented History Condition
  • Cost Reduction due to reduced Cable Failure
• Course Conclusion
• Post-Test and Evaluation

For registration & more information please contact

NAYEL Training Centre 

T: +971 4 379 7245 | M: +971 50 249 6876 WhatsApp +971 50 249 6876

Email [email protected]