GE G30 - Reverse Power

9-8 G30 Generator Protection System GE Multilin
9.1 SETTING EXAMPLE 9 APPLICATION OF SETTINGS
9
The source used for loss of excitation should produce positive power when the machine is generating. Make the following
changes in EnerVista UR Setup or through the SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1  LOSS OF EXCI-
TATION menu:
9.1.7 REVERSE POWER
The reverse power element should be set at ½ the rated motoring power. The pickup is calculated as follows:
(EQ 9.15)
For the example system:
(EQ 9.16)
To prevent maloperation for power swings the element is typically time delayed by 20 to 30 seconds. For sequential tripping
applications the time delay will be 2 to 3 seconds. The element may be blocked when the generator is offline. The line
source will be used for this application. Make the following changes in EnerVista UR Setup or through the
SETTINGS 
GROUPED ELEMENTS  SETTING GROUP 1  SENSITIVE DIRECTIONAL POWER  DIRECTIONAL POWER 1 menu:
S
min
1
2
---
Rated Motoring Power (primary watts)
3 Phase CT Primary Phase VT Ratio Phase VT Secondary×××
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
×=
S
min
1
2
---
22 10
6
× W
3 8000 A 115× 69 V××
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× 0.033 pu==