Basler BE1-CDS220, Instruction Manual

Page: 337 / 476

BE1-CDS220 Testing And Maintenance 13-23
Refer to Section 6, Reporting and Alarm Functions, Sequence of Events Recorder Function, for
information on retrieving and resetting SER records.
System Report Documentation
After completing all previous steps in Commissioning Testing and before placing the protection system in
service, it is important to create a record of the relay settings and system status at the time of
commissioning. This report should be kept for comparison in future maintenance procedures.
To create the settings record, transmit the ASCII S command and then use normal personal computer
techniques to save or print the SER report that is returned.
To create the status record, transmit the ASCII RG-STAT command and then use normal personal
computer techniques to save or print the status report that is returned.
Purpose: To create a permanent status and settings record for future reference before initially loading
the system.
Reference Commands: S, RG-STAT
Refer to Section 6, Reporting and Alarm Functions, General Status Reporting, and Sequence of Events
Recorder Function, for information on retrieving and resetting SER records.
In Service Current Circuit Verification
To verify correct CT circuit connections, internal phase, zero sequence and tap compensation settings for
the differential functions, it is recommended that the load be placed on the protected zone and a
differential check record be triggered, recorded, and examined. See Section 6, Reporting and Alarm
Functions, Differential Current Monitoring Function for more information on differential check records.
To assist you in performing this procedure, an Annotated Differential Check Record and an In Service
Current Circuit Verification Form is provided on the following pages. It is recommended that this form be
copied, completed (filled out), and that the differential check record retrieved from the relay be captured to
a file and printed. These two documents should then be placed with the commissioning records for future
reference.
Test Scenarios
The protected circuit should be loaded prior to triggering a differential check record. It is desirable that the
loading be great enough to result in relay currents that are above the minimum sensitivity of the differential
current diagnostic function, but not great enough to cause a trip if there is a problem in the installation. The
minimum sensitivity of the differential current diagnostic function is 150 milliamperes of secondary current
for 5 ampere relays and 30 milliamperes of secondary current or 1 ampere relays.
When you put initial loading on the differential zone of protection, one of four scenarios may result.
1. Everything is correct and there is no differential alarm or trip.
2. There is a problem with the settings or installation but the initial loading is too low so there is no
differential alarm or trip.