GE Feeder Management Relay 750 User Manual

GE Multilin 750/760 Feeder Management Relay 2-1
2 INTRODUCTION 2.1 OVERVIEW
2
2 INTRODUCTION 2.1OVERVIEW 2.1.1 DESCRIPTION
The 750/760 Feeder Management Relays are microprocessor-based units intended for the management and primary pro-
tection of distribution feeders, as well as for the management and backup protection of buses, transformers, and transmis-
sion lines. The 760 relay is particularly suited to overhead feeders, where automatic reclosing is normally applied.
Each relay provides protection, control, and monitoring functions with both local and remote human interfaces. They also
display the present trip/alarm conditions, and most of the more than 35 measured system parameters. Recording of past
trip, alarm or control events, maximum demand levels, and energy consumption is also performed.
These relays contain many innovative features. To meet diverse utility standards and industry requirements, these features
have the flexibility to be programmed to meet specific user needs. This flexibility will naturally make a piece of equipment
difficult to learn. To aid new users in getting basic protection operating quickly, setpoints are set to typical default values and
advanced features are disabled. These settings can be reprogrammed at any time.
Programming can be accomplished with the front panel keys and display. Due to the numerous settings, this manual
method can be somewhat laborious. To simplify programming and provide a more intuitive interface, setpoints can be
entered with a PC running the 750/760PC software provided with the relay. Even with minimal computer knowledge, this
menu-driven software provides easy access to all front panel functions. Actual values and setpoints can be displayed,
altered, stored, and printed. If settings are stored in a setpoint file, they can be downloaded at any time to the front panel
program port of the relay via a computer cable connected to the serial port of any personal computer.
A summary of the available functions and a single-line diagram of protection and control features is shown below. For a
complete understanding of each features operation, refer to Chapter 5: Setpoints. The logic diagrams include a reference
to every setpoint related to a feature and show all logic signals passed between individual features. Information related to
the selection of settings for each setpoint is also provided.
Figure 2–1: FUNCTIONAL BLOCK DIAGRAM
Trip Relay
Close Relay
5 Auxiliary Relays
Self-Test Warning Relay
8 Analog Outputs
Underfrequency Restoration
Undervoltage Restoration
Manual Close
Synchronism Check
Cold Load Pickup
Power Factor
Oscillograph
Arcing
Tripping
Demand
Data Logger
Event Recorder
1 x RS232
Modbus RTU
DNP 3.0
2 x RS485 OR
1 x RS422
Fault Locator
Transfer
Auto Reclose (760)
Overfrequency
Analog Input
VT Failure
OUTPUTS
CONTROL
MONITOR
COMMUNICATIONS
818840AD.dwg
VT
Fail
3+4
27
27
1+2
3
52
N
Calc.
V2
750/760
Feeder Management Relay
¨
Line VT
Breaker
Trip
Close
25
46/50
67N
67P
51V
810
Control
Control
Phase A only
Bus VT
50
BF
:
:
SOURCE
1
50SG
51SG
67SG
Control
47
1+2
59
dcmA
Rate
3Vo
Calc.
59N
Calc.
3Io
2
I
Calc.
Level
50P
Supervision
Current
760 Only
79X
50P
Demand
55
1+2
Calc.
I
2
Calc.
2
V
Calc.
Calc.
V
1
Control
67G
51G
50G
46/51
46/67
Control
-Vo
Calc.
Zone
Coordination
1
I
GROUND
OPERATING CURRENT
SENSITIVE GROUND
OPERATING CURRENT
POLARIZING CURRENT*
ARE MUTUALLY EXCLUSIVE SINCE BOTH USE
* POLARIZING CURRENT AND GND CURRENT
THE SAME RELAY CT INPUT TERMINALS
Level
Coil Monitors
Breaker Operation
1+2
81U
81
Decay
50P
1+2
1+2
51P
51N
1+2
1+2
50N
50N
Level
Courtesy of NationalSwitchgear.com

GE Feeder Management Relay 750 Specifications

General

Brand	GE
Model	Feeder Management Relay 750
Category	Protection Device
Language	English