Neutral Current - GE F60 Instruction Manual

5.6 GROUPED ELEMENTS
The phase directional element responds to the forward load current. In the case of a following reverse fault, the ele-
ment needs some time – in the order of 8 ms – to establish a blocking signal. Some protection elements such as
NOTE instantaneous overcurrent may 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 supervi-
sion of the phase directional element. If current reversal is of a concern, a longer delay – in the order of 20 ms –
may be needed.
5
a) MAIN MENU

PATH: SETTINGS GROUPED ELEMENTS
 NEUTRAL CURRENT

5-182
Figure 5–73: PHASE DIRECTIONAL SCHEME LOGIC

SETTING GROUP 1(6)
 NEUTRAL TOC1

 NEUTRAL TOC2
MESSAGE

 NEUTRAL TOC3
MESSAGE

 NEUTRAL TOC4
MESSAGE

 NEUTRAL IOC1
MESSAGE

F60 Feeder Protection System


NEUTRAL CURRENT

See page 5–183.
See page 5–183.
See page 5–183.
See page 5–183.
See page 5–184.
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5 SETTINGS
5.6.5 NEUTRAL CURRENT
GE Multilin