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Module 3 Advance Relay Synchro Check Slides

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Module 3 - Synchro Check Relay Testing & Maintenance Synchro Check Relay Testing Table of Contents Introduction Relay Application Operation Relay Inspection And ... – PowerPoint PPT presentation

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Title: Module 3 Advance Relay Synchro Check Slides


1
Module 3 - Synchro Check Relay Testing
Maintenance
Synchro Check Relay Testing   Table of
Contents   Introduction Relay Application Operatio
n Relay Inspection And Maintenance Adjustments Mod
ule Study Questions
2
Module 3 - Synchro Check Relay Testing
Maintenance
  • OBJECTIVES
  • Upon completion of this module, the participant
    should be able to
  • Describe the common applications for
    Synchro-Check relays.
  • Name the NEMA number for Synchro-check relays.
  • Describe the five different synchro-check options.

3
Module 3 - Synchro Check Relay Testing
Maintenance
  • Relay Application
  • ANSI Number 25 used for
  • Check Synchronism between systems
  • Permissive for energizing dead systems
  • Prevents circuit breaker closure unless safe
    condition exist
  • ANSI Number 25 used to protect
  • Generators
  • Circuit breakers between two sources

4
Module 3 - Synchro Check Relay Testing
Maintenance
  • Relay Operation
  • Measure delta V between systems
  • Measure phase angle difference between systems
  • Check phase rotations between systems
  • Measure slip frequency
  • Dead line / Dead Bus
  • Dead Line / Live Bus
  • Live Line / Dead Bus
  • Operates on any combination of above conditions
    depending on setting and capabilities
  • Uses two coils which provide reset and operating
    torque
  • Not used as an Auto-synchronizer

5
Module 3 - Synchro Check Relay Testing
Maintenance
Internal Schematics
6
Module 3 - Synchro Check Relay Testing
Maintenance
Internal Schematics
7
Module 3 - Synchro Check Relay Testing
Maintenance
  • Acceptance Testing Maintenance Testing
  • Acceptance Testing
  • First Installation
  • Very Thorough
  • Test on all Taps
  • Ensure that it will operate with at every setting
  • Maintenance Testing
  • Annually or by Predictive Maintenance Program
  • As found before any maintenance performed
  • As left after cleaning and maintenance

8
Module 3 - Synchro Check Relay Testing
Maintenance
  • Relay Inspection and Maintenance
  • Correct Relay?
  • Relay operating?
  • Check Tap and Time Dial
  • Free disc rotation?
  • Disc has Vertical Air Gap?
  • Dirt, Moisture, or Rust?
  • Contacts Free of Burning or Pitting?
  • Spring color and condition
  • Target coil even and operates Freely?
  • Target coil firm?
  • Connections Tight?

9
Module 3 - Synchro Check Relay Testing
Maintenance
Protective Relay Tests Test Connections
10
Module 3 - Synchro Check Relay Testing
Maintenance
Protective Relay Tests Test Connections
11
Module 3 - Synchro Check Relay Testing
Maintenance
  • Protective Relay Tests
  • Minimum Pick-Up
  • Apply rated voltage to one input
  • Increase 2nd input voltage until relay contacts
    chatter
  • Pick up should match bottom of characteristic
    circle

12
Module 3 - Synchro Check Relay Testing
Maintenance
  • Protective Relay Tests
  • Maximum Pick-Up
  • Continue to increase voltage from minimum pick up
    test
  • Stop when relay contacts chatter
  • Pick up should match top of characteristic circle

13
Module 3 - Synchro Check Relay Testing
Maintenance
  • Protective Relay Tests
  • Timing Test
  • Apply rated voltage to both inputs in phase
  • Ensure relay operates
  • Connect contact monitoring equipment and remove
    one voltage
  • Simultaneously apply rated voltage to input and
    start timer
  • Contacts should close as per timing
    characteristic curve

14
Module 3 - Synchro Check Relay Testing
Maintenance
  • Protective Relay Tests
  • Timing Test

15
Module 3 - Synchro Check Relay Testing
Maintenance
16
Module 3 - Synchro Check Relay Testing
Maintenance
  • Protective Relay Tests
  • Operating Angles
  • Apply rated voltage to both inputs in phase
  • Decrease phase angle of 1 input until contacts
    chatter
  • Record results
  • Increase phase angle of same input until contacts
    chatter
  • Record Results
  • Results should match characteristic circle

17
Module 3 - Synchro Check Relay Testing
Maintenance
  • Protective Relay Tests
  • Operating Angles

18
Module 3 - Synchro Check Relay Testing
Maintenance
  • Protective Relay Tests
  • DC Target Test
  • Provides Trip Indication
  • Low impedance shunt for disc contacts and spring
  • Minimum Pick up
  • Close disc contacts
  • Increase current until seal in operates
  • 2.0 or 0.2 amps based on tap setting
  • Seal in
  • After Pick up, release disc contacts
  • Coil should remain energized after disc contacts
    open
  • Drop Out
  • Decrease current until seal in drops out

19
Module 3 - Synchro Check Relay Testing
Maintenance
Module Study Questions   1. Where are
synchro-check relays used?       
20
Module 3 - Synchro Check Relay Testing
Maintenance
Module Study Questions   1. Where are
synchro-check relays used?  Any breaker between
two sources   2. What is the NEMA Designation
for Synchro-check relays?     
21
Module 3 - Synchro Check Relay Testing
Maintenance
Module Study Questions   2. What is the NEMA
Designation for Synchro-check relays? 
25   3. Describe the operation of a Live Line /
Dead Bus function?       
22
Module 3 - Synchro Check Relay Testing
Maintenance
  • Module Study Questions
  •  
  • Describe the operation of a Live Line / Dead Bus
    function? 
  • Contacts close if Line voltage exceeds live
    setpoint and Bus input lower than dead setpoint
  • 4. Why are Live Line / Dead Bus functions used? 
  •  
  •  
  •  

23
Module 3 - Synchro Check Relay Testing
Maintenance
Module Study Questions 4. Why are Live Line /
Dead Bus functions used?   Safely energize a
dead system 5. Which contacts in Figure 4 are
used in the control circuit?
24
Module 3 - Synchro Check Relay Testing
Maintenance
Module Study Questions 5. Which contacts in
Figure 4 are used in the control circuit? 1 -
2   6. What are the basic steps required to
determine the Minimum pick up?
25
Module 3 - Synchro Check Relay Testing
Maintenance
Module Study Questions  6. What are the basic
steps required to determine the Minimum pick
up? Apply rated voltage on one input Increase
voltage on second input until pick up
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