Safe Operation and Maintenance of Circuit Breakers and Switchgear

THE WORKSHOP

Switchgear plays an important role in electricity distribution and its performance significantly affects the overall performance of the system. Failure to efficiently disconnect faults elsewhere in the network or failure in switchgear itself is costly, resulting in additional loss of supply, damage to equipment and possibly fatal injury to personnel. It is therefore critically important that switchgear is operated and maintained correctly, within an overall asset management regime that is both economic and effective in securing a high level of system reliability.

This comprehensive workshop focuses on medium voltage switchgear, which comprises by far the bulk of switchgear on most electricity distribution systems. The emphasis is primarily on oil, air blast, SF6 and vacuum circuit breakers, but other forms of MV switchgear, for example ring main units and auto-reclosers will also be described.

WHAT IS INCLUDED?

  • Receive a certificate of attendance in support of your continuing professional commitment
  • All workshops include the associated hardcopy technical manual
  • Printed workshop handouts
  • Lunch and refreshments
  • Interact and network with workshop attendees and experienced instructors
  • Practical, industry driven content to assist you in your continuing professional development (CPD)
  • Attendees automatically become IDC subscribers and receive exclusive deals and technical content every month

WHO SHOULD ATTEND?

Managers, engineers and technicians who work with switchgear and circuit breakers and who need to update their skills and knowledge in this critical area of electrical power systems protection.

CONTENT SUMMARY

INTRODUCTION

SWITCHGEAR IN A NETWORK CONTEXT

  • Single line diagrams
  • Active and passive network components
  • Circuit breaker utilisation
  • Alternative forms of MV switchgear - ring main units, load breaking/fault making switches
  • Fuse switches
  • HV fuses in combination with, and as alternative to circuit breakers
  • Auto-reclosers and auto-reclose operation

SWITCHGEAR - A HISTORIC PERSPECTIVE

  • Principles of current interruption
  • Plain break circuit breakers
  • Bulk and small oil volume circuit breakers
  • Turbulator (explosion pot)
  • Operating mechanisms
  • Transfer earth circuit breakers
  • Air break and air blast switchgear
  • SF6 and vacuum
  • Switchgear in association with disconnectors
  • Fixed and withdrawable designs
  • Switchgear standards
  • Factors affecting switchgear selection

SWITCHGEAR RATING AND SPECIFICATION

  • Switchgear rating - highest system and impulse withstand voltages, load and short circuit currents
  • Simple and complex protection systems
  • Switchgear ancillaries, measurement CTs, VTs, relays
  • Cable terminations
  • Indoor and outdoor operation
  • Substation and switch room layouts and design

SHORT CIRCUIT TESTING

  • Symmetrical and asymmetrical breaking
  • Make and break operations
  • Understanding test oscillograms

CASE STUDY - SPECIFICATION FOR A 132 kV SWITCHBOARD

SAFETY POLICIES

  • General safety precautions and the use of personal protective equipment
  • Principles of safety rules
  • Principles of personnel authorisation
  • Operative training for safe operation of switchgear
  • Isolation in a circuit breaker context
  • Safety documentation
  • Operational and safety locking, caution and danger notices
  • Safe working in a substation environment
  • Safety interlocks
  • Substation alarms
  • Individual study task and presentation - safety policies in my company and how they might be improved

OPERATION OF MODERN SWITCHGEAR

  • Case studies:
  • Westinghouse bulk oil circuit breaker type J-18
  • Magrini Galileo series MGE minimum oil circuit breakers
  • Reyrolle Pacific vacuum circuit breakers type LMVP
  • Sprecher+Schuh SF6 circuit breakers type PF-107
  • NEBB Air break switches in metal clad cubicles
  • Check phasing - the Pfisterer phase testers Mk I and II
  • Safe circuit testing

ASSET MANAGEMENT IN A SWITCHGEAR CONTEXT

  • Principles of time and condition based asset management
  • Asset registers
  • Asset management systems

SWITCHGEAR DIAGNOSTICS

  • Switchgear inspection methodologies
  • Partial discharge measurement and survey
  • Timing tests
  • Thermovision

MAINTENANCE OF CIRCUIT BREAKERS

  • Mechanisms of deterioration
  • Degradation of insulation
  • Principles of circuit breaker maintenance
  • Maintaining oil circuit breakers
  • Contact maintenance and contact wipe
  • Oil testing
  • Maintaining vacuum circuit breakers
  • Maintaining SF6 circuit breakers
  • SOPs and DINs
  • Switchgear defects and defect control systems

Book Now

 

 

This course is available fully online by our sister organization the Engineering Institute of Technology (EIT).

CLICK HERE for more information.