GE L90

CHAPTER 5: SETTINGS GROUPED ELEMENTS
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-323
5
Figure 5-183: Directional power element sample applications
DIR POWER 1 RCA — Specifies the relay characteristic angle (RCA) for the sensitive directional power function. Application of
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
DIR POWER 1 RCA to “0°,” reactive overpower by
setting
DIR POWER 1 RCA to “90°,” active underpower by setting DIR POWER 1 RCA to “180°,” and reactive underpower by
setting
DIR POWER 1 RCA to “270°.”