IB02602004E
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Instructional Literature
Effective: May 2008
Page
157
Instructions for the FP-6000 Protective Relay
8.7 Wye Versus Delta Voltage Transformers
The FP-6000 requires setting of system configuration parameters
for proper operation of all system functions (see programming
Section 5.1). All voltage settings are based on the VT input
configuration. Both wye (
φ
- G) and Delta (
φ
-
φ
) voltage
connections are supported. For wye-connected systems, the
voltage settings are based on phase-to-ground voltages. Voltage
settings are based on phase-to-phase voltages for delta-
connected systems.
The V
x
input can be used for Sync-Check (25) or measured 3V
o
,
but V
x
can not be used for both. The V
x
input must be used for
3V
o
ground source to be measured for delta connected PT
systems.
8.8 Frequency Protection (81)
The FP-6000 includes protective functions for detecting
underfrequency and overfrequency conditions. Two elements are
provided for each function so alarm and trip levels can be set
independently. Each of the frequency protection functions has a
Threshold and a Delay setting. The time delay is provided for
coordination with other devices. If the voltage on phase A drops
below 10 volts, the underfrequency and overfrequency functions
are disabled.
An overfrequency pickup occurs when the measured frequency
exceeds the overfrequency Threshold setting. The overfrequency
trip is set when the overfrequency condition exists for the delay
time specified. The overfrequency pickup and trip are reset when
the frequency drops below the overfrequency Threshold setting.
An underfrequency pickup occurs when the measured frequency
drops below the underfrequency Threshold setting. The
underfrequency trip is set when the underfrequency condition
exists for the delay time specified. The underfrequency pickup
and trip is reset when the frequency raises above the
underfrequency Threshold setting.
The settings for the overfrequency and underfrequency functions
are shown in Section 5 Programming and are repeated in Table
45.
Table 45. Frequency Protection Settings.
Figure 52. Loss of Potential.
PARAMETER
RANGE
STEP
81U-1 Under
Frequency
Threshold
45 to 65 Hz,
Disabled
0.1 Hz
81U-1 Under
Frequency
Time Delay
0 to 9999 Cycles
1 Cycle
81O-1 Over
Frequency
Threshold
45 to 65 Hz,
Disabled
0.1 Hz
81O-1 Over
Frequency
Time Delay
0 to 9999 Cycles
1 Cycle
81U-2 Under
Threshold
Frequency
45 to 65 Hz,
Disabled
0.1 Hz
81U-2 Under
Frequency
Time Delay
0 to 9999 Cycles
1 Cycle
81O-2 Over
Frequency
Threshold
45 to 65 Hz,
Disabled
0.1 Hz
81O-2 Over
Frequency
Time Delay
0 to 9999 Cycles
1 Cycle
52a
Residual Current
Less than 0.1Ipu
T1
0
V1/V2 > 40%
0
T2
S
R
Q
V0 <
ε
Any Phase V<
ε
Any IOC pickups
Any phase current
> 2 Ipu
T3
0
LOPB
LOPB Enable
LOP
52a
Residual Current
Less than 0.1Ipu
T1
0
T1
0
V1/V2 > 40%
0
T2
S
R
Q
S
R
Q
V0 <
ε
Any Phase V<
ε
Any IOC pickups
Any phase current
> 2 Ipu
T3
0
T3
0
LOPB
LOPB Enable
LOP
e = very small value