Digital Elements - GE G30 Instruction Manual

CONTROL ELEMENTS

5.8.10 Digital elements

SETTINGS  CONTROL ELEMENTS  DIGITAL ELEMENTS  DIGITAL ELEMENT 1(48)
 DIGITAL ELEMENT 1

5
Digital elements run once per power system cycle.
As such they can easily fail to react to an input signal or a block signal with a duration less than one power system
cycle. This also means that digital element output can react up to one power system cycle later than the pickup
and reset delay settings indicate.
Do not use digital elements with transient signals, such as communications commands. Do not use digital
elements where random delays of up to one cycle cannot be tolerated, such as in high speed protection.
There are 48 identical digital elements available, numbered 1 to 48. A digital element can monitor any FlexLogic operand
and present a target message and/or enable events recording depending on the output operand state. The digital element
settings include a name to be referenced in any target message, a blocking input from any selected FlexLogic operand,
and a timer for pickup and reset delays for the output operand.
DIGITAL ELEMENT 1 INPUT
DIGITAL ELEMENT 1 PICKUP DELAY
is not required, set to "0," To avoid nuisance alarms, set the delay greater than the operating time of the breaker.
DIGITAL ELEMENT 1 RESET DELAY
DIGITAL ELEMENT 1 PICKUP LED
operation of the pickup LED is blocked.
5-266
DIGITAL ELEMENT 1

FUNCTION: Disabled
DIG ELEM 1 NAME:

Dig Element 1
DIG ELEM 1 INPUT:

Off
DIG ELEM 1 PICKUP

DELAY: 0.000 s
DIG ELEM 1 RESET

DELAY: 0.000 s
DIGITAL ELEMENT 1

PICKUP LED: Enabled
DIG ELEM 1 BLOCK:

Off
DIGITAL ELEMENT 1

TARGET: Self-reset
DIGITAL ELEMENT 1

EVENTS: Disabled
— Selects a FlexLogic operand to be monitored by the digital element.
— Sets the required time delay from element pickup to element operation. If a pickup delay
— Sets the time delay to reset. If a reset delay is not required, set to "0."
— This setting enables or disabled the digital element pickup LED. When set to "Disabled," the
Range: Disabled, Enabled
Range: up to 16 alphanumeric characters
Range: FlexLogic operand
Range: 0.000 to 999999.999 s in steps of 0.001
Range: 0.000 to 999999.999 s in steps of 0.001
Range: Disabled, Enabled
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
G30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS