Overview; Trip Bus; Control Elements - GE N60 Instruction Manual

CONTROL ELEMENTS

DIR POWER 1 STG1 SMIN
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. See the Directional Power Sample Applications figure
for details. Together with the RCA, this setting enables a wide range of operating characteristics. This setting applies to
three-phase power and is entered in per-unit (pu) values. The base quantity is 3 x VT pu base x CT pu base.
For example, a setting of 2% for a 200 MW machine is 0.02  200 MW = 4 MW. If 13.8kV is line voltage and 10 kA is a
primary CT current, the source pu quantity is 239 MVA, and thus, SMIN needs to 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.
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 STG1 DELAY
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 = 0
SETTING
5
DIR POWER 1 SOURCE:
Three-phase active power (P)
Three-phase reactive power (Q)
5.8 Control elements

5.8.1 Overview

Control elements are used for control rather than protection. See the Introduction to Elements section at the beginning of
this chapter for information.

5.8.2 Trip bus

SETTINGS  CONTROL ELEMENTS  TRIP BUS  TRIP BUS 1(6)
 TRIP BUS 1

5-188
— This setting specifies the minimum power as defined along the relay characteristic angle (RCA)
— This setting specifies a time delay for stage 1. For reverse power or low forward power
Figure 5-91: Sensitive directional power logic
SETTINGS
DIR POWER 1 RCA:
DIR POWER 1
CALIBRATION:
DIR POWER 1 STG1
SMIN:
DIR POWER 1 STG2
SMIN:
RUN
DIRECTIONAL POWER
CHARACTERISTICS
TRIP BUS 1

FUNCTION: Disabled
TRIP BUS 1 BLOCK:

Off
TRIP BUS 1 PICKUP

DELAY: 0.00 s
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
SETTING
DIR POWER 1 STG1
DELAY:
t
PKP
100 ms
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
100 ms
Range: Enabled, Disabled
Range: FlexLogic operand
Range: 0.00 to 600.00 s in steps of 0.01
CHAPTER 5: 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
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