GE F650 - Page 203

5-56 F650 Digital Bay Controller GEK-106310AB
5.4 PROTECTION ELEMENTS 5 SETTINGS
5
5.4.4 NEUTRAL CURRENT
The Neutral Current menu incorporates the following overcurrent elements:
• Neutral time overcurrent (51N)
• Neutral instantaneous overcurrent (50N)
• Neutral directional element (67N)
5.4.4.1 NEUTRAL TIME DELAYED OVERCURRENT ELEMENT (51N)
Neutral TOC is a neutral time delayed overcurrent protection element. This element uses as the input quantity the neutral
current, calculated from the phase currents. The trip can be timed by a curve selectable by setting. The reset can be
instantaneous or linear.
Table 5–46: NEUTRAL TOC ELEMENT SETTINGS
The snapshot event setting enables or disables the snapshot event generation for this element.
5.4.4.2 NEUTRAL INSTANTANEOUS OVERCURRENT ELEMENT (50N)
This function can be used as an instantaneous element or as a definite time element. The element responds to the neutral
current, calculated from phase currents.
Table 5–47: NEUTRAL IOC ELEMENT SETTINGS
The snapshot event setting enables or disables the snapshot event generation for this element.
SETPOINT > PROTECTION ELEMENTS > NEUTRAL CURRENT > NEUTRAL TOC
NEUTRAL TOC 1> NEUTRAL TOC 2 > NEUTRAL TOC 3
SETTING DESCRIPTION NAME DEFAULT VALUE STEP RANGE
Function permission Function DISABLED N/A [DISABLED – ENABLED]
Pickup level Pickup Level 1.00 0.01 A [0.05 : 160.00]
Curve shape Curve IEEE Ext Inv N/A [See list of curves]
Time Dial TD Multiplier 1.00 0.01 s [0.00 : 900.00]
Reset type Reset INSTANTANEOUS N/A [INSTANTANEOUS – LINEAR]
Snapshot Event generation Snapshot Events ENABLED N/A [DISABLED – ENABLED]
SETPOINT > PROTECTION ELEMENTS > NEUTRAL CURRENT > NEUTRAL IOC
NEUTRAL IOC 1> NEUTRAL IOC 2 > NEUTRAL IOC 3
SETTING DESCRIPTION NAME DEFAULT
VALUE
STEP RANGE
Function permission Function DISABLED N/A [DISABLED – ENABLED]
Pickup level Pickup Level 30.00 0.01 A [0.05 : 160.00]
Trip time Trip Delay 0.00 0.01 s [0.00 : 900.00]
Reset time Reset Delay 0.00 0.01 s [0.00 : 900.00]
Snapshot event generation Snapshot Events ENABLED N/A [DISABLED – ENABLED]