Application Example - GE Feeder Management Relay 750 Instruction Manual

1 GETTING STARTED
1. Move to message
defined input is going to be changed in this section.
USER INPUT A NAME:
User Input A
2. If an application is to be using the relay as a substation monitor, it is more informative to rename this input 'Substation
Monitor'. Press the
USER INPUT A NAME:
ser Input A
3. Press the or
VALUE
store the character and advance the cursor to the next position. Change the second character to a "u" in the same
manner. Continue entering characters in this way until all characters the text "Substation Monitor" are entered. Note
that a space is selected like a character. If a character is entered incorrectly, press the
cursor returns to the position of the error. Re-enter the character as required. Once complete, press the
remove the solid cursor and view the result.
USER INPUT A NAME:
Substation Monitor
a) DESCRIPTION
The 750 and 760 relays contain many features designed to accommodate a wide range of applications. This chapter is pro-
vided to guide you, the first time user, through a real-world application. The following step-by-step installation example, pro-
vides you with a quick and convenient way of becoming familiar with the relay. To start, simply power on the unit, and follow
the instructions in this tutorial. The example assumes the following system characteristics. It also assumes that relay set-
points are unaltered from their factory default values.
• Power System Data
System: 3 , 4 wire
Φ
Frequency: 60 Hz
Line Voltage: 13.8 kV
Maximum Current: 600 A
• Control System Requirements
All protection elements used are to trip the breaker.
Breaker position monitoring via 52b contact only.
Only current metering is required.
Contact Inputs: Remote open and close contacts from RTU. Remote/local selection from panel hand switch. Reset
from RTU. Alarm after 100 second delay from substation monitor
Contact Outputs: Trip and close to breaker control circuit (trip and close relays). Relay failure alarm to RTU (self-test
warning relay, no programming required). Alarm contact to RTU (setup in User Function for "Substation Monitor")
No data communications to other equipment.
• Instrument Transformer Data
Bus VTs: 3 × Wye connected, ratio = 14.4 kV:120 V
Phase CTs: 3 × Wye connected, ratio = 600:5 A
• Phase Protection Settings
Time Overcurrent 1: Curve Shape = Moderately Inverse; Pickup = 840 A; Multiplier = 20.2
Instantaneous Overcurrent 1: Pickup = 840 A; Phases Required = Any Two; Delay = 0 seconds
Instantaneous Overcurrent 2: Pickup = 10100 A; Phases Required = Any Two; Delay = 0 seconds
GE Multilin
Courtesy of NationalSwitchgear.com
S3 LOGIC INPUTS USER INPUT A
key and a solid cursor ( ) will appear in the first character position.
ENTER
key until the character "S" is displayed in the first position. Now press the
VALUE
750/760 Feeder Management Relay
setpoint message. The name of this user
USER INPUT A NAME
1.2 USING THE RELAY
key to
ENTER
key repeatedly until the
ENTER
key to
ESCAPE

1.2.4 APPLICATION EXAMPLE

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