• Home
  • Courses
  • Machines
    • Transformer
    • AC Motors
      • Induction Motor
      • Synchronous Motor
    • DC Motor
    • DC Generator
  • Power System
    • Circuit Breaker
    • Switchgear
    • Substation
    • Control System
    • Measurement
  • Electronics
  • Blog
  • Contact
    • Contact Us
    • Privacy Policy
Have any question?
[email protected]
RegisterLogin
StudyElectrical.Com
  • Home
  • Courses
  • Machines
    • Transformer
    • AC Motors
      • Induction Motor
      • Synchronous Motor
    • DC Motor
    • DC Generator
  • Power System
    • Circuit Breaker
    • Switchgear
    • Substation
    • Control System
    • Measurement
  • Electronics
  • Blog
  • Contact
    • Contact Us
    • Privacy Policy

Power System

What are Motor Control Centres?

  • Categories Power System, Circuit Breaker, Electrical Relays, Synchronous Motor, Three Phase Induction Motor
motor control center

The Motor Control Centre is used in general to describe combinations of enclosures, busbars, circuit breakers, power contactors, power fuses, protective relays, controls and indicating devices.

Read more about switchgear here What is Switchgear? | Features, Components and Classification

The standards used in Europe often refer to IEC60050 for definitions of general terms. Particular IEC standards tend to give additional definitions that relate to the equipment being described.

Motor Control Centre
Motor Control Centre

Example:

  • IEC60439 and IEC60947 for low voltage equipment, 
  • IEC60056, IEC60298 and IEC60694 for high voltage equipment. An earlier standard IEC60277 has been withdrawn. 

These standards tend to prefer the general terms ‘switchgear’ and ‘controlgear’. Controlgear may be used in the same context as ‘motor control centres’ which is a more popular and specific term used in the oil industry.

In general switchgear may be more closely associated with switchboards that contain circuit breaker or contactor cubicles for power distribution to other switchboards and motor control centres, and which receive their power from generators or incoming lines or cables.

Motor control centres tend to be assemblies that contain outgoing cubicles specifically for supplying and controlling power to motors. 

cotor%2Bcontrol%2Bcenter%2Bpanels
Motor Control Center Panels


However, motor control centres may contain outgoing cubicles for interconnection to other  switchboards or motor control centres, and circuit breakers for their incomers and busbar sectioning.

Switchboards may be a combination of switchgear and motor control centres. For example a main high voltage switchboard for an offshore platform will have switchgear for the generators, busbar sectioning and outgoing transformer feeders. It will have motor control centre cubicles for the high voltage motors.

IEC60439 applies to low voltage equipment that is described as ‘factory built  assemblies’, or FBAs, of switchgear and controlgear.

Switchgear tends to be operated infrequently, whereas motor control centres operate frequently as required by the process that uses the motor.

Apart from the incomers and busbar section circuit breakers, the motor control centres are designed with contactors and fuses (or some types of moulded case circuit breakers in low voltage equipment) that will interrupt fault currents within a fraction of a cycle of AC current.

Circuit breakers need several cycles of fault current to flow before interruption is complete. Consequently the components within a circuit breaker must withstand the higher forces and heat produced when several complete cycles of fault current flow.

Switchgear is available up to at least 400 kV, whereas motor control centres are only designed for voltages up to approximately 15 kV because this is the normal limit for high voltage motors.

Related Articles

  • Working of a DC motor
    Back EMF and Its Significance in DC Motor

    What is Back EMF? When the armature of a DC motor rotates under the influence of…

  • fUNCTION OF PROTECTIVE RELAYS
    Function of Protective Relays in Power System

    We usually think of an electric power system in terms of its more impressive parts…

  • how stepper motor works
    Video: How Stepper Motor Works?

    How does a robotic arm in a production plant repeat exactly the same movements over…

  • Synchronous 2Bmotor 2Bstarting 2Bmethods
    Starting Methods for Synchronous Motor

    Synchronous motors are not self-starting. Some additional devices should be used to start the motor.…

  • dc motor voltage and power equations
    Voltage and Power Equations of DC Motor | Condition of Maximum Power

    In this post, we will look at the voltage and power equation of a dc…

  • circuit breaker rating
    Circuit Breaker Ratings

    The rating of circuit breaker is given according to the duties that are performed by…

  • Share:
author avatar
Electrical Engineer

Previous post

Types of Gas Turbine Engines
May 3, 2018

Next post

Percentage Impedance of Transformer and Its Calculation
May 26, 2018

You may also like

percentage_reactance transformer
Percentage Reactance in Power System (Transformer, Generator or Reactor)
16 January, 2023
Load Curve and Load Duration Curve
Load Duration Curve in Power Station
29 September, 2022
Double end break disconnect switch
Disconnect Switches (Isolator) in Substation: Types, Design and Working
1 September, 2022

Leave A Reply Cancel reply

Your email address will not be published. Required fields are marked *

Search Here

From Blog

Rectifier Transformers
Rectifier Transformer – Working Principle and Application
25Nov2015
assignment
Tips on Accomplishing Your Assignments with Ease
13Aug2021
MCQ
Objective Questions on Single Phase Motors | Part 2
06Dec2013
Phased Array Transducer
How are the Element Patterns in the Phased Array Probes?
20Jul2022

Categories

  • Alternator
  • Arduino
  • Basic Electrical
  • Battery
  • Books
  • Cables
  • Capacitor
  • Career
  • Circuit Breaker
  • Control System
  • DC Generator
  • DC Motor
  • Drives
  • Electric Vehicles
  • Electrical Circuits
  • Electrical Machines
  • Electrical Relays
  • Electrical Safety
  • Electronics
  • Embedded System
  • Exams
  • Generation
  • Guest Post
  • HVDC
  • Instrumentation
  • Interview Questions
  • Locomotives
  • Measurement
  • Microcontroller
  • Objective Questions
  • PCB
  • PLC
  • Power System
  • Problems and Solution
  • Projects
  • Resistor
  • Signals and Systems
  • Single Phase Motors
  • Substation
  • Switchgear
  • Synchronous Motor
  • Three Phase Induction Motor
  • Transformer
  • Transmission Line
  • Uncategorized

Copyright © 2021 Study Electrical, Inc.

© StudyElectrical.Com 2021

Login with your site account

Lost your password?

Not a member yet? Register now

Register a new account

Are you a member? Login now