GE F60 Instruction Manual page 214

5.5 GROUPED ELEMENTS
• DIR POWER 1(2) RCA: Specifies the relay characteristic angle (RCA) for the directional power function. Application of
this setting is threefold:
1. It allows the element to respond to active or reactive power in any direction (active overpower/underpower, etc.).
2. Together with a precise calibration angle, it allows compensation for any CT and VT angular errors to permit more
sensitive settings.
3. It allows for required direction in situations when the voltage signal is taken from behind a delta-wye connected
power transformer and the phase angle compensation is required.
For example, the active overpower characteristic is achieved by setting
by setting
DIR POWER 1(2) RCA
power by setting
DIR POWER 1(2) RCA
• DIR POWER 1(2) CALIBRATION: This setting allows the RCA to change in small steps of 0.05°. This may be useful
when a small difference in VT and CT angular errors is to be compensated to permit more sensitive settings. This set-
ting virtually enables calibration of the Directional Power function in terms of the angular error of applied VTs and CTs.
The element responds to the sum of the
• DIR POWER 1(2) STG1 SMIN: This setting specifies the minimum power as defined along the RCA angle for the
stage 1 of the element. The positive values imply a shift towards the operate region along the RCA line. The negative
values imply a shift towards the restrain region along the RCA line. Refer to the Directional Power Sample Applications
figure for an illustration. Together with the RCA, this setting enables a wide range of operating characteristics. This set-
ting applies to three-phase power and is entered in pu. The base quantity is 3 × VT pu base × CT pu base.
For example, a setting of 2% for a 200 MW machine, is 0.02 × 200 MW = 4 MW. If 7.967 kV is a primary VT voltage
and 10 kA is a primary CT current, the source pu quantity is 239 MVA, and thus, SMIN should be set at 4 MW /
239 MVA = 0.0167 pu ≈ 0.017 pu. If the reverse power application is considered, RCA = 180° and SMIN = 0.017 pu.
5
The element drops out if the magnitude of the positive-sequence current becomes virtually zero, that is, it drops below
the cutoff level.
• DIR POWER 1(2) STG1 DELAY: This setting specifies a time delay for Stage 1. For reverse power or low forward
power applications for a synchronous machine, Stage 1 is typically applied for alarming and Stage 2 for tripping.
SETTING
DIR POWER 1
FUNCTION:
Enabled = 1
SETTING
DIR POWER 1 BLK:
Off
SETTING
DIR POWER 1 SOURCE:
3Φ Active Power (P)
3Φ Reactive Power (Q)
5-126
to "90°", active underpower by setting
to "270°".
DIR POWER 1(2) RCA
SETTINGS
DIR POWER 1 RCA:
DIR POWER 1
CALIBRATION:
DIR POWER 1 STG1
SMIN:
DIR POWER 1 STG2
SMIN:
RUN
DIRECTIONAL POWER
CHARACTERISTICS
Figure 5–71: DIRECTIONAL POWER SCHEME LOGIC
F60 Feeder Management Relay
DIR POWER 1(2) RCA
to "180°", and reactive under-
DIR POWER 1(2) RCA
and
DIR POWER 1(2) CALIBRATION
SETTING
DIR POWER 1 STG1
DELAY:
t
PKP
100ms
FLEXLOGIC OPERANDS
DIR POWER 1 STG1 DPO
DIR POWER 1 STG1 PKP
DIR POWER 1 STG2 PKP
DIR POWER 1 STG2 DPO
SETTING
DIR POWER 1 STG2
DELAY:
t
PKP
100ms
5 SETTINGS
to "0°", reactive overpower
settings.
FLEXLOGIC OPERANDS
DIR POWER 1 STG1 OP
DIR POWER 1 DPO
DIR POWER 1 PKP
DIR POWER 1 OP
DIR POWER 1 STG2 OP
842003A2.CDR
GE Multilin