GE T60 Instruction Manual page 482

Transformer protection system
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GROUPED ELEMENTS
5
— Specifies the relay characteristic angle (RCA) for the sensitive directional power function. Application of
DIR POWER 1 RCA
this setting is threefold:
It allows the element to respond to active or reactive power in any direction (active overpower/underpower, and so on)
Together with a precise calibration angle, it allows compensation for any CT and VT angular errors to permit more
sensitive settings
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
setting
DIR POWER 1 RCA
setting
DIR POWER 1 RCA
5-300
Figure 5-175: Directional power element sample applications
to "90°," active underpower by setting
to "270°."
to "0°," reactive overpower by
DIR POWER 1 RCA
to "180°," and reactive underpower by
DIR POWER 1 RCA
T60 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS

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