Inst ToolsInst ToolsInst Tools
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Search
  • Books
  • Software
  • Projects
  • Process
  • Tools
  • Basics
  • Formula
  • Power Plant
  • Root Cause Analysis
  • Electrical Basics
  • Animation
  • Standards
  • 4-20 mA Course
  • Siemens PLC Course
Reading: Parallel AC Generators
Share
Notification Show More
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • Design
  • PLC
  • Interview
  • Control System
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Electrical Theory > Parallel AC Generators

Parallel AC Generators

Last updated: August 5, 2018 7:41 pm
Editorial Staff
Electrical Theory
No Comments
Share
2 Min Read
SHARE

Paralleling AC Generators

Most electrical power grids and distribution systems have more than one AC generator operating at one time. Normally, two or more generators are operated in parallel in order to increase the available power. Three conditions must be met prior to paralleling (or synchronizing) AC generators.

  • Their terminal voltages must be equal. If the voltages of the two AC generators are not equal, one of the AC generators could be picked up as a reactive load to the other AC generator. This causes high currents to be exchanged between the two machines, possibly causing generator or distribution system damage.
  • Their frequencies must be equal. A mismatch in frequencies of the two AC generators will cause the generator with the lower frequency to be picked up as a load on the other generator (a condition referred to as “motoring”). This can cause an overload in the generators and the distribution system.
  • output voltages must be in phase. A mismatch in the phases will cause large opposing voltages to be developed. The worst case mismatch would be 180° out of phase, resulting in an opposing voltage between the two generators of twice the output voltage. This high voltage can cause damage to the generators and distribution system due to high currents.

During paralleling operations, voltages of the two generators that are to be paralleled are indicated through the use of voltmeters. Frequency matching is accomplished through the use of output frequency meters.

Phase matching is accomplished through the use of a synchroscope, a device that senses the two frequencies and gives an indication of phase differences and a relative comparison of frequency differences.

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 !

Continue Reading

Single Phase Power Wiring Schemes
Induction Motor Torque Versus Slip
Batteries Theory
Batteries
Single Phase AC Induction Motors
Transformer Mutual Induction
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
210kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

Ampere Hour Meter
DC Machines Construction
Kirchhoff’s Laws
Capacitance
Generator Action in a Motor
Voltage Polarity and Current Direction
Low Voltage Air Circuit Breaker Principle
Capacitor

Keep Learning

Series Circuit

Series Circuit

DC Generator

DC Generator

DC Circuit Node Equations

DC Circuit Analysis Node Equations

DC Motor Action

DC Motor Speed

Core-Type Transformer

Transformer Turns Ratio

Block Diagram

Block Diagram

Basic AC Generator

AC Generator Parts

current division Formula for Resistor Circuit

Current Division

Learn More

Purge & Pressurization Systems Questions

Purge & Pressurization Systems Interview Questions

Thermocouples

Important Factors for Thermocouple Selection

What is OTDR Testing

Understanding the Difference between HOP Test and OTDR

Design Basis for Fire Detection and Alarm System

Design Basis for Fire Detection and Alarm System

Vacuum Tubes Multiple Choice Questions and Answers

Vacuum Tubes Multiple Choice Questions and Answers

Steam Turbine Driven Centrifugal Compressors Leak due to Broken Instrument

Discharge Head 3‑monthly leaks of Steam Turbine Driven Centrifugal Compressors

Fail-Close Valve

What is a Fail-Close Valve? – Advantages and Disadvantages

Gas-Insulated Transmission Line

What is Gas-Insulated Transmission Line? Principle Advantages

Menu

  • About
  • Privacy Policy
  • Copyright

Quick Links

  • Learn PLC
  • Helping Hand
  • Part Time Job

YouTube Subscribe

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?