Neutral Current - GE F60 Instruction Manual

CHAPTER 5: SETTINGS
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.

5.7.5 Neutral current

5.7.5.1 Menu
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  NEUTRAL CURRENT
 NEUTRAL CURRENT
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F60 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 5-105: Phase directional logic
 NEUTRAL TOC 1
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 NEUTRAL TOC 4
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 NEUTRAL IOC 1
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 NEUTRAL IOC 6
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GROUPED ELEMENTS
See below
See page 5-209
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