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469 MOTOR MANAGEMENT RELAY – QUICK REFERENCE GUIDE
QUICK REFERENCE GUIDE
12
Application Example
12.1
Description
The 469 Motor Management Relay contains many features designed to accommodate a
wide range of motor management applications. This chapter is provided to guide you, the
first time user, through a real-world application.
The following is typical example of how to determine the relay setpoints for a specific
motor that has been applied conservatively. This is only an example and may not address
all issues relating to your specific application. It is recommended that your local protection
engineer determine the setpoints for your motor protective relaying application. Refer to
figures 1 to 3 for schematic diagrams related to this example.
Important points to keep in mind before developing settings for any multifunction
numerical device like the 469 Motor Management relay:
Gather system data, including, but not limited to:
•
CT primary and secondary ratings for all the CTs that will be used to feed the relay
•
Motor nameplate data.
•
Motor operating curves. The following is a typical set of motor operating curves:
•
VT primary and secondary ratings
806553A1.CDR
1.000
10.000
100.000
1000.000
0
500
1,000
1,500
2,000
2,500
Current (Amps)
Ti
m
e
(s
ec
.)