Neutral Current - GE L90 Instruction Manual

CHAPTER 5: SETTINGS
— This setting enables and disables the logging of phase directional overcurrent events in the
PHASE DIR 1 EVENTS
sequence of events recorder.
The phase directional element responds to the forward load current. In the case of a following reverse fault, the
element needs some time—in the order of 8 ms—to establish a blocking signal. Some protection elements, such as
instantaneous overcurrent, respond to reverse faults before the blocking signal is established. Therefore, a
coordination time of at least 10 ms must be added to all the instantaneous protection elements under the
supervision of the phase directional element. If current reversal is of concern, a longer delay—in the order of 20
ms—is needed.

5.7.9 Neutral current

5.7.9.1 Menu
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  NEUTRAL CURRENT
 NEUTRAL CURRENT

L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
Figure 5-133: Phase directional logic
 NEUTRAL TOC 1



 NEUTRAL TOC 4


 NEUTRAL IOC 1



GROUPED ELEMENTS
See below
See page 5-249
5
5-247