Inst ToolsInst ToolsInst Tools
  • Ask
  • Courses
  • Videos
  • Q & A
    • Interview
      • Instrumentation
      • Electronics
      • Electrical
      • Practical Questions
    • MCQ
      • Instrumentation MCQ
      • Electrical MCQ
      • Electronics MCQ
      • Control Systems MCQ
      • Analog Electronics MCQ
      • Digital Electronics MCQ
      • Power Electronics MCQ
      • Microprocessor MCQ
      • Multiple Choice Questions
  • EE
    • Electronics
      • Electronics Q & A
      • Electronic Basics
      • Electronic Devices & Circuits
      • Electronics Animation
      • Digital Electronics
    • Electrical
      • Electrical Basics
      • Electrical Q & A
      • Power Electronics
      • Electrical Machines
      • Electrical Animation
      • Power Systems
      • Switchgear & Protection
      • Transmission & Distribution
  • Measure
    • Control Valves
    • Calibration
    • Temperature
    • Pressure
    • Flow
    • Level
    • Analyzers
    • Switches
    • Vibration
    • Solenoid Valve
  • Control
    • PLC Tutorials
    • Control Systems
    • Safety Instrumented System (SIS)
    • Communication
    • Fire & Gas System
  • More
    • Design
    • Tools
    • Animation
    • Basics
    • Formulas
    • Standards
    • TextBooks
    • Common
    • Software
    • Excel Tools
    • Erection & Commissioning
    • Process Fundamentals
    • Videos
    • Books
Search
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Reading: What happen When Synchronous Generator loss Excitation
Share
Notification Show More
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • PLC Tutorials
  • Control Systems
Search
  • Ask
  • Courses
  • Videos
  • Q & A
    • Interview
    • MCQ
  • EE
    • Electronics
    • Electrical
  • Measure
    • Control Valves
    • Calibration
    • Temperature
    • Pressure
    • Flow
    • Level
    • Analyzers
    • Switches
    • Vibration
    • Solenoid Valve
  • Control
    • PLC Tutorials
    • Control Systems
    • Safety Instrumented System (SIS)
    • Communication
    • Fire & Gas System
  • More
    • Design
    • Tools
    • Animation
    • Basics
    • Formulas
    • Standards
    • TextBooks
    • Common
    • Software
    • Excel Tools
    • Erection & Commissioning
    • Process Fundamentals
    • Videos
    • Books
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Electrical Machines > What happen When Synchronous Generator loss Excitation

What happen When Synchronous Generator loss Excitation

Last updated: April 25, 2016 3:15 pm
Editorial Staff
Electrical Machines
No Comments
Share
2 Min Read
SHARE

During normal operation of the Synchronous Generator or Alternator excitation to the rotor is provided by the small DC generator running on the same shaft along with main generator. When synchronous generator delivering power to the grid or load it delivers both real power and reactive power to the system. Reactive power is the magnetizing power which helps to deliver the real power from source to the load and also reactive power helps to improve the voltage of the system. Almost all the loads (except capacitance loads) in the power system draws reactive power from system. Alternators, synchronous condensers and capacitor banks connected in the power systems are the only sources of reactive power.

Real power delivered by the generator (MW output power) is governed by the prime mover and the Reactive power delivered (MVAR output ) is governed by the field excitation. When field excitation to the synchronous generator is lost then synchronous generator operates as induction generator and instead of delivering reactive power it absorbs the reactive power from the system as much as 2 to 4 times the generator’s rated load. However the real power (MW output) delivered by the induction generator will remain almost the same as this is controlled by the prime mover.But loss of generator’s reactive power in the system may cause instability to the system. Also, as alternator is operating as induction generator, high currents are induced in to the rotor teeth and wedges and may damage the rotor of the generator. However large alternators are designed to withstand this induced currents.

Immediate tripping of alternator in the case of loss of excitation is not necessary unless the terminal voltage of the generator falls below desired limit due to voltage collapse. Loss of excitation relay (40G) is used for sensing the loss of excitation.

Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !
Types of Generators
Advantages and Disadvantages of Slip Ring Induction Motor
Difference between Permanent Magnet BLDC and DC Motor
Types of Transfomer Cooling Methods
Parallel Operation of Alternators
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

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

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
208kSubscribersSubscribe
38kFollowersFollow

Categories

Recent Comments

  • Guifty Shimica on Top Non-PLC Certification Courses for Automation Professionals
  • Guifty Shimica on Top Non-PLC Certification Courses for Automation Professionals
  • MIHARITSOA Aina Sitraka on Top Non-PLC Certification Courses for Automation Professionals
  • Vaishnavi on Free Instrumentation Course for Trainee Engineers

Related Articles

Questions and Answers on Motors and Generators

100+ Questions and Answers on Motors and Generators

Why rating of Synchronous Generators and Alternators in MVA or KVA

6.6kV HV Induction motor Protection

AC Induction Motor Construction

Basics of AC Induction Motors

Why Damper windings used in synchronous motors

Induction Motors Faults and Protection

Distribution transformer

Types of Transformers

Advantages and Applications of zigzag transformer

More Articles

Split Range Control for Temperature Control Application

Split Range Control Working Principle

Liapunov’s Stability Analysis

Liapunov’s Stability Criterion – Part I

Converter Instruction in Siemens PLC Programming

Converter Instruction in Siemens PLC Programming

Ladder Logic Example with Timers

Ladder Logic Example with Timers

Single Block and Bleed Valve Manifold

Single Block and Bleed Valve Manifold Operation

Types of Filters used in Air Compressors

How Do Air Compressor Filters Clean and Protect the System?

Top 250 Electronic Circuits Objective Questions and Answers

Top 250 Electronic Circuits Objective Questions and Answers

Faceplate in WinCC

Siemens HMI Training – Using UDTs with Faceplates

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?