Switchgear Testing

Submitted by tracy_mickey on Wed, 05/11/2011 - 3:01pm

Click Here For Course Schedule
The training is mostly hands on testing that will be helpful in all aspects of the electrical industry. Every electrician should be familiar with the operation of Meggers and Hipots. This may be the only opertunity you will ever have to dismantle a 1200 amp breaker for an inside look. It will provide electricians who are new to primary testing the basic knowledge required to perform acceptance testing of the medium voltage switchgear 1000 to 38000 Volts.

Length:  40 HOURS  
Prerequisites: Journeyman Electrician/ Power Systems Electrician
           

This is a practical course that covers:

  • the basic function and operation of the hardware and components,
  • the purpose of the required tests to be performed,
  • the applicable test standards and the test procedures to be followed,
  • the hazards and safety requirements for testing,
  • the connections and operations of the test equipment and
  • the test forms to be filled and data analysis


The training is specific to the:

  • Metalclad Switchgear;insurtion and extraction of 1200 amp Breakers,CT and PT testing Bus Bar Test
  • Vacuum circuit breakers;hipot,contact resistance, interlocks
  • Load break disconnects;safety and operation
  • Dry-type transformers;ration test, NGR tests, temperature controller
  • Cable;highpot @ 60,000 volts

Overview

Module 0: Introduction to Electrical System Commissioning for Medium Voltage Substations and NETA standards for acceptance testing specification.

  • The why, what and how of testing
  • Definition of commissioning and types of commissioning
  • Commissioning Process
  • Commissioning plan
  • NETA standard

Module 1: Medium Voltage Switchgear Assemblies

  • Switchgear Standards: CSA, EEMAC, ANSI/IEEE and IEC
  • Switchgear and switchgear assemblies: major parts, characteristics and basic parts
  • Installations: Indoor and outdoor
  • Factory Testing

Module 2: Commissioning Switchgear Assemblies

  • Electrical test and procedures: Insulation resistance, AC Hi-pot, DC Hi-pot, Low resistance test
  • Safety awareness and practices: qualifications, recommended practices and IEEE standard 510 Recommended Practices for Safety in High Voltage and High Power testing.
  • NETA Acceptance testing Procedures
  • Test set operations
  • Test forms
  • MV Switchgear Acceptance Testing Practicum

Module 3: Commissioning Instrument Transformers

  • Instrument Transformers: Polarity and terminal markings
  • Nameplate Data and symbols
  • Instrument transformer standards: CSA & IEEE
  • Current transformer: Theory, types, ratings, standard burden, accuracy
  • Voltage transformers: Groups, over voltage requirements, accuracy, burden, thermal rating
  • CT Commissioning test and procedures: Secondary circuit insulation resistance, AC Hi-pot, DC Hi-pot, Low resistance test
  • VT Commissioning test and procedures: Dielectric Withstand, ratio, polarity
  • NETA Acceptance testing procedures
  • Test forms
  • Instrument Transformer Acceptance Testing Practicum

Module 4: Commissioning Power Circuit Breakers (Draft stage)

  • Power Circuit breaker: nameplate rating and types
  • Arc extinction methods; air-magnetic and vacuum
  • Non-electrical test: mechanical inspections, manual operation, mechanical interlocks
  • Electrical operational test: anti-slam, anti-pump, trip free
  • High voltage test and procedures: insulation resistance, dielectric withstand, vacuum integrity
  • Low voltage test and procedures: contact resistance and timing
  • Control circuit checks
  • NETA Acceptance testing procedures
  • Test forms
  • Vacuum Power Circuit Breaker Acceptance Testing Practicum

Module 5: Commissioning Air Switches (Draft stage)

  • Types of switch: disconnect, load-break
  • Switch Standard: ANSI & IEC
  • Non electrical test: manual operation, switch alignment, interlocks
  • Electrical test: Trip and close (optional)
  • High voltage test and procedures: Dielectric withstand
  • Low Voltage test and procedures: Contact resistance
  • NETA Acceptance testing procedures
  • Test forms
  • Load Break Disconnect Acceptance Testing Practicum

Module 6: Commissioning of Transformers (Draft stage)

  • Transformer nameplate data
  • Connections, taps and tap changer
  • Polarity
  • Cooling methods: Dry type, Liquid immersed
  • Construction: Free breathing, sealed, nitrogen seal
  • Auxiliary devices: Oil temperature, winding temperature, pressure relief, oil level, sudden pressure, reverse flow
  • Standards: ANSI/IEEE
  • Control circuit checks
  • Electrical test and procedures: Turns ratio, insulation resistance, polarizing index, winding resistance, Dielectric withstand, polarity, power factor, sweep frequency response
  • NETA Acceptance testing procedures
  • Test forms
  • Dry-type Transformer Acceptance Testing Practicum


Outcome:
By the end of this course the participants will have the basic knowledge to perform commissioning and acceptance testing of the MV switchgear using safe working practices and referencing the NETA standard as a guideline.