GE 850 User Manual

CHAPTER 7: MONITORING FUNCTIONS
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 7–35
Digital Counters
The 850 relay provides sixteen identical Digital Counters. A Digital Counter counts the
number of state transitions from logic 0 to logic 1.
The Digital Counters are numbered from 1 to 16. The counters are used to count
operations such as the Pickups of an element, the changes of state of an external contact
(e.g. breaker auxiliary switch), or the pulses from a watt-hour meter.
Path: Setpoints > Monitoring > Functions > Digital Counters > Digital Counter 1 (16)
FUNCTION
Range: Disabled, Enabled
Default: Disabled
NAME
Range: Any 13 alphanumeric characters
Default: Counter 1
UNITS
Range: Any 5 alphanumeric characters
Default: Units
Assigns a label to identify the unit of measure with respect to the digital transitions to be
counted. The units label will appear in the metering corresponding Actual Values Status
under RECORDS/DIGITAL COUNTERS.
PRE-SET
Range: -2147483648, 0, +2147483647
Default: 0
The setpoint sets the count to a required pre-set value before counting operations begin,
as in the case where a substitute relay is installed in place of an in-service relay, or while
the Counter is running.
COMPARE
Range: -2147483648, 0, +2147483647
Default: 0
The setpoint sets the value to which the accumulated count value is compared. Three
FlexLogic output operands are provided to indicate if the present value is ‘more than (HI)’,
‘equal to (EQL)’, or ‘less than (LO)’ the set value.
UP
Range: Off, Any FlexLogic operand
Default: Off
The setpoint selects the FlexLogic operand for incrementing the Counter. If an enabled
UP input is received when the accumulated value is at the limit of +2147483647, the
counter rolls over to -2147483648 and shows the alarm ‘Digital Counter 1 at Limit’.
DOWN
Range: Off, Any FlexLogic operand
Default: Off
The setpoint selects the FlexLogic operand for decrementing the Counter. If an enabled
DOWN input is received when the accumulated value is at the limit of +2147483647, the
counter rolls over to -2147483648 and shows the alarm ‘Digital Counter 1 at Limit’.
SET TO PRE-SET
Range: Off, Any FlexLogic operand
Default: Off
The setpoint selects the FlexLogic operand used to set the counter to the pre-set value.
The counter is set at pre-set value in the following situations:

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