5 SETTINGS
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The C70 contains protection elements for neutral time overcurrent (ANSI device 51G), neutral instantaneous overcurrent
(ANSI device 50G), and neutral current unbalance (ANSI device 60N). A maximum of six ground time overcurrent and
twelve ground instantaneous overcurrent elements are available, dependent on the CT/VT modules ordered with the relay.
Three neutral current unbalance elements are available.
b) NEUTRAL TIME OVERCURRENT (ANSI 51N, IEC PTOC)
PATH: SETTINGS
GROUPED ELEMENTS
NEUTRAL TOC1
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The neutral time overcurrent element can provide a desired time-delay operating characteristic versus the applied current
or be used as a simple definite time element. The neutral current input value is a quantity calculated as 3Io from the phase
currents and may be programmed as fundamental phasor magnitude or total waveform RMS magnitude as required by the
application.
GE Multilin
NEUTRAL CURRENT
UNBALANCE 1
NEUTRAL CURRENT
UNBALANCE 2
NEUTRAL CURRENT
UNBALANCE 3
SETTING GROUP 1(6)
NEUTRAL TOC1
FUNCTION: Disabled
NEUTRAL TOC1 SIGNAL
SOURCE: SRC 1
NEUTRAL TOC1
INPUT: Phasor
NEUTRAL TOC1
PICKUP:
1.000 pu
NEUTRAL TOC1
CURVE: IEEE Mod Inv
NEUTRAL TOC1
TD MULTIPLIER:
NEUTRAL TOC1
RESET: Instantaneous
NEUTRAL TOC1 BLOCK:
Off
NEUTRAL TOC1
TARGET: Self-reset
NEUTRAL TOC1
EVENTS: Disabled
C70 Capacitor Bank Protection and Control System
5.6 GROUPED ELEMENTS
See page 5–173.
See page 5–173.
See page 5–173.
NEUTRAL CURRENT
NEUTRAL TOC1(6)
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: Phasor, RMS
Range: 0.000 to 30.000 pu in steps of 0.001
Range: See OVERCURRENT CURVE TYPES table
Range: 0.00 to 600.00 in steps of 0.01
1.00
Range: Instantaneous, Timed
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
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