GROUPED ELEMENTS
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 12
ground instantaneous overcurrent elements are available, dependent on the CT/VT modules ordered with the relay. Three
neutral current unbalance elements are available.
5.7.4.2 Neutral time overcurrent (ANSI 51N, IEC PTOC)
SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) NEUTRAL CURRENT NEUTRAL TOC1(6)
5
NEUTRAL TOC1
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 can be programmed as fundamental phasor magnitude or total waveform RMS magnitude as required by
the application.
5-172
NEUTRAL TOC6
NEUTRAL IOC1
NEUTRAL IOC12
NEUTRAL
DIRECTIONAL OC1
NEUTRAL CURRENT
UNBALANCE 1
NEUTRAL CURRENT
UNBALANCE 3
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: 1.00
NEUTRAL TOC1
RESET: Instantaneous
NEUTRAL TOC1 BLOCK:
Off
NEUTRAL TOC1
TARGET: Self-reset
NEUTRAL TOC1
EVENTS: Disabled
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
See page 5-173
See page 5-175
See page 5-179
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
Range: Instantaneous, Timed
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled