GE 850 User Manual

5–68 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
SYSTEM CHAPTER 5: DEVICE, SYSTEM, INPUT AND OUTPUT SETPOINTS
LEA (Low Energy Analog)
The 850-P can be connected to 6 LEA voltage inputs (two 3-phase voltage banks, LEA
Bnk1-J2 and LEA Bnk2-J2).
The LEA voltage inputs setup for the 850-P is shown below:
Path: Setpoints > System > Voltage Sensing > LEA Bnk1-J2
Path: Setpoints > System > Voltage Sensing > Ph LEA Bnk2-J2
Settings Descriptions
LEA BANK NAME
Range: Any combination of 13 alphanumeric characters
Default: LEA Bnk1(2)-J2
Enter the name of the phase voltage from bank J2.
PHASE TERMINAL CONNECTION
Range: ABC, ACB, BAC, BCA, CAB, CBA
Default: ABC
Select the type of phase terminal connection to match the LEA Sensors connected to the
relay.
LEA RATED SECONDARY
Range: 1.0 to 10.0 V in steps of 0.1 V
Default: 10.0 V
Select the output secondary voltage (defined on the voltage sensor) connected to the
LEA inputs.
LEA RATED PHASE ANGLE
Range: 0.0° to 359.9° in steps of 0.1°
Default: 0.0° Lag
Enter the phase shift of secondary voltage related to the primary voltage. Due to the
transformation algorithms used for some sensors, the secondary side keeps a shifted
angle with regards to the primary voltage. The Phase Angle Shift (at nominal system
frequency) information is provided in the sensor data specification sheet. Enter this
information in this setting.
LEA RATIO
Range: 1.00 to 5000.00 in steps of 0.01
Default: 1.00
This setpoint specifies the voltage ratio between the primary and secondary sides for
the desired voltage application.
Setting “Phase Terminal
Connection”
Phase Input to the corresponding LEA Sensor terminal input
LEA Sensor 1 LEA Sensor 2 LEA Sensor 3
ABC Phase A Phase B Phase C
ACB Phase A Phase C Phase B
BAC Phase B Phase A Phase C
BCA Phase B Phase C Phase A
CAB Phase C Phase A Phase B
CBA Phase C Phase B Phase A

GE 850 Specifications

General

Brand	GE
Model	850
Category	Protection Device
Language	English

Summary

850 Feeder Protection System

Front Control Panel Interface

Common Setpoints

Provides a general description of common setpoints and their operational characteristics.

Device

Covers device configuration modes (Simplified/Regular) and custom configuration options.

Current Elements

Details various current-based protection elements like TOC, IOC, and directional overcurrent.

Trip and Close Circuit Monitoring

Local Control Mode (breakers and switches)

Details local control operations for breakers and switches via front panel or contact inputs.

FlexLogic

Explains the arrangement of internal digital logic and user-programmed parameters for flexible control.

Specifications

Provides detailed technical specifications for the device, including protection, input/output, and communication parameters.

Software Interface

Voltage Elements

Introduces undervoltage, overvoltage, and frequency protection elements.

Breaker Health

Breaker Failure (50BF)

Details the Breaker Failure scheme for detecting and responding to breaker failures.

Testing

Fault Reports

Cautions and Warnings

Outlines safety indicators, general precautions, and specific warnings for installation and operation.

Working with Setpoints & Setpoints Files

Security

Explains Basic Security and CyberSentry features, including roles, password complexity, and AAA server authentication.

Autoreclose

Covers the Autoreclose scheme for automatic reclosing after faults.

Transient Ground Fault Detection