GE C70 Instruction Manual page 291

Capacitor bank protection and control system ur series
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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.
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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
5
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