Frequency Rate Of Change (Ansi 81R) - GE G30 Instruction Manual

Ur series generator protection system
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5.7 CONTROL ELEMENTS

PATH: SETTINGS
CONTROL ELEMENTS
 FREQUENCY RATE
 OF CHANGE 1
5
Four independent rate of change of frequency elements are available. The element responds to rate of change of fre-
quency with voltage, current and frequency supervision.
FREQ RATE 1 TREND: This setting allows configuring the element to respond to increasing or decreasing frequency,
or to frequency change in either direction.
FREQ RATE 1 PICKUP: This setting specifies an intended
decreasing trend, set
condition is:
df dt
For applications monitoring an increasing trend, set
old accordingly. The operating condition is:
For applications monitoring rate of change of frequency in any direction set
specify the pickup threshold accordingly. The operating condition is:
FREQ RATE 1 OV SUPV PICKUP: This setting defines minimum voltage level required for operation of the element.
The supervising function responds to the positive-sequence voltage. Overvoltage supervision should be used to pre-
vent operation under specific system conditions such as faults.
FREQ RATE 1 OC SUPV PICKUP: This setting defines minimum current level required for operation of the element.
The supervising function responds to the positive-sequence current. Typical application includes load shedding. Set
the pickup threshold to zero if no overcurrent supervision is required.
5-226

FREQUENCY RATE OF CHANGE
FREQ RATE 1
FUNCTION: Disabled
FREQ RATE 1 SOURCE:
MESSAGE
SRC 1
FREQ RATE 1 TREND:
MESSAGE
Increasing
FREQ RATE 1 PICKUP:
MESSAGE
0.50 Hz/sec
FREQ RATE 1 OV SUPV
MESSAGE
PICKUP: 0.700 pu
FREQ RATE 1 OC SUPV
MESSAGE
PICKUP: 0.200 pu
FREQ RATE 1 MIN
MESSAGE
FREQUENCY: 45.00 Hz
FREQ RATE 1 MAX
MESSAGE
FREQUENCY: 65.00 Hz
FREQ RATE 1 PICKUP
MESSAGE
DELAY: 0.000 s
FREQ RATE 1 RESET
MESSAGE
DELAY: 0.000 s
FREQ RATE 1 BLOCK:
MESSAGE
Off
FREQ RATE 1 TARGET:
MESSAGE
Self-Reset
FREQ RATE 1 EVENTS:
MESSAGE
Disabled
to "Decreasing" and specify the pickup threshold accordingly. The operating
FREQ RATE 1 TREND
>
Pickup
.
df dt
G30 Generator Protection System

5.7.7 FREQUENCY RATE OF CHANGE (ANSI 81R)

FREQUENCY RATE OF CHANGE 1(4)
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: Increasing, Decreasing, Bi-directional
Range: 0.10 to 15.00 Hz/sec in steps of 0.01
Range: 0.100 to 3.000 pu in steps of 0.001
Range: 0.000 to 30.000 pu in steps of 0.001
Range: 20.00 to 80.00 Hz in steps of 0.01
Range: 20.00 to 80.00 Hz in steps of 0.01
Range: 0 to 65.535 s in steps of 0.001
Range: 0 to 65.535 s in steps of 0.001
Range: FlexLogic operand
Range: Self-Reset, Latched, Disabled
Range: Disabled, Enabled
df dt
pickup threshold. For applications monitoring a
to "Increasing" and specify the pickup thresh-
FREQ RATE 1 TREND
>
Pickup
.
FREQ RATE 1 TREND
abs df dt
(
5 SETTINGS
to "Bi-Directional" and
)
>
Pickup
GE Multilin

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