PERIODIC TESTING
Because the relay has extensive internal self-test capabilities, periodic testing of the protection system
can be greatly reduced. The relay characteristics are a function of the programming instructions that do
not drift over time. Thus, the user may wish to verify that the:
Set points that were proven during the commissioning have not been changed.
Inputs and outputs are properly interfacing with the rest of the protection and control system.
Power system analog parameters used by the protection and control functions are being
measured accurately.
These are things that the self-test capability cannot completely determine.
Settings Verification
Verification of the relay settings can be accomplished in several ways depending upon the user’s
preferences and practices. This step may not be required if the settings changed alarm point is
programmed to an output and is being monitored. This way, any unexpected setting changes would be
logged and investigated. Some settings verification possibilities include:
Repeating the Protection and Control Function commissioning tests.
If a file of the settings recorded upon commissioning is available, the settings can be read out of
the relay, captured to a similar file, and compared using software tools.
The settings can be verified by simple inspection of the settings versus those recorded upon
commissioning.
Digital I/O Connection Verification
Verification of the relay digital I/O connections can be accomplished in several ways depending upon the
user’s preferences and practices.
Repeating the digital I/O connection verification commissioning tests.
Monitoring SER, Status and Fault reports for proper sensing of digital signals and proper tripping
during normal operation.
NOTE
If protection systems are redundant such that multiple relays will trip a given
breaker or device for a fault, simply monitoring fault reports may not indicate a
failed output contact. The relay may report that it energized an output. However,
tripping was actually accomplished by the redundant relay. With this situation,
actually testing the contact is recommended.
Analog Circuit Verification
NOTE
If you are going to verify the analog measurement circuits by comparison to
independent devices, you should ensure that the two devices use similar
measurement algorithms. For example, the measurements of a fundamental
sensing relay cannot be compared with the measurements of an RMS sensing
device.
Verification of the relay analog measurement circuits can be accomplished in several ways depending
upon the user’s preferences and practices. Some of these ways are:
Repeating portions of the acceptance or commissioning tests and injecting known test signals
into the relay.
Using the metering functions of the relay and comparing the measurements to those provided by
other similar devices that are measuring the same signals. Redundant relays and/or metering
devices can provide this source of independent conformation of the measured signals. If the relay
is connected to an integration system, this can even be automated and done on a routine basis.
13-30
BE1-CDS240 Testing and Maintenance
9365200990 Rev F
Summary of Contents for BE1-CDS240
Page 2: ......
Page 8: ...vi BE1 CDS240 Introduction 9365200990 Rev F This page intentionally left blank ...
Page 38: ...1 28 BE1 CDS240 General Information 9365200990 Rev F This page intentionally left blank ...
Page 40: ...ii BE1 CDS240 Quick Start 9365200990 Rev F This page intentionally left blank ...
Page 152: ...ii BE1 CDS240 Metering 9365200990 Rev F This page intentionally left blank ...
Page 226: ...iv BE1 CDS240 Application 9365200990 Rev F This page intentionally left blank ...
Page 286: ...ii BE1 CDS240 Security 9365200990 Rev F This page intentionally left blank ...
Page 290: ...9 4 BE1 CDS240 Security 9365200990 Rev F This page intentionally left blank ...
Page 292: ...ii BE1 CDS240 Human Machine Interface 9365200990 Rev F This page intentionally left blank ...
Page 306: ...10 14 BE1 CDS240 Human Machine Interface 9365200990 Rev F This page intentionally left blank ...
Page 308: ...ii BE1 CDS240 ASCII Command Interface 9365200990 Rev F This page intentionally left blank ...
Page 342: ...11 34 BE1 CDS240 ASCII Command Interface 9365200990 Rev F This page intentionally left blank ...
Page 349: ...Figure 12 5 Horizontal Rack Mount Front View 9365200990 Rev F BE1 CDS240 Installation 12 5 ...
Page 361: ...Figure 12 17 Typical DC Connection Diagrams 9365200990 Rev F BE1 CDS240 Installation 12 17 ...
Page 372: ...12 28 BE1 CDS240 Installation 9365200990 Rev F This page intentionally left blank ...
Page 468: ...13 92 BE1 CDS240 Testing and Maintenance 9365200990 Rev F This page intentionally left blank ...
Page 512: ...14 42 BE1 CDS240 BESTCOMS Software 9365200990 Rev F This page intentionally left blank ...
Page 544: ...ii BE1 CDS240 Terminal Communication 9365200990 Rev F This page intentionally left blank ...
Page 550: ...ii BE1 CDS240 Settings Calculations 9365200990 Rev F This page intentionally left blank ...
Page 578: ...D 28 BE1 CDS240 Settings Calculations 9365200990 Rev F This page intentionally left blank ...
Page 579: ......