Ground Current - GE C70 Instruction Manual
Capacitor bank protection and control system
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- Instruction manual (708 pages) ,
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- Instruction manual (672 pages)
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CHAPTER 5: SETTINGS
5.7.5 Ground current
5.7.5.1 Menu
SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) GROUND CURRENT
GROUND CURRENT
5.7.5.2 Ground time overcurrent (ANSI 51G, IEC PTOC)
SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) GROUND CURRENT GROUND TOC1(6)
GROUND TOC1
This element can provide a required time-delay operating characteristic versus the applied current or be used as a simple
definite time element. The ground current input value is the quantity measured by the ground input CT and is the
fundamental phasor or RMS magnitude. Two methods of resetting operation are available: "Timed" and "Instantaneous"
(see the Inverse TOC Curve Characteristics section for details). When the element is blocked, the time accumulator resets
according to the reset characteristic. For example, if the element reset characteristic is set to "Instantaneous" and the
element is blocked, the time accumulator clears immediately.
— This setting enables and disables the ground time overcurrent protection element.
GROUND TOC1 FUNCTION
GROUND TOC1 SIGNAL SOURCE
— This setting selects how ground current input quantities are interpreted by the C70. Inputs can be
GROUND TOC1 INPUT
selected as fundamental phasor magnitudes or total waveform RMS magnitudes as required by the application.
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
GROUND TOC1
GROUND TOC6
GROUND IOC1
GROUND IOC12
GROUND TOC1
FUNCTION: Disabled
GROUND TOC1 SIGNAL
SOURCE: SRC 1
GROUND TOC1
INPUT: Phasor
GROUND TOC1
PICKUP: 1.000 pu
GROUND TOC1
CURVE: IEEE Mod Inv
GROUND TOC1
TD MULTIPLIER: 1.00
GROUND TOC1
RESET: Instantaneous
GROUND TOC1 BLOCK:
Off
GROUND TOC1
TARGET: Self-reset
GROUND TOC1
EVENTS: Disabled
— This setting selects the signal source for the ground time overcurrent protection element.
GROUPED ELEMENTS
See below
See page 5-184
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 the 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
5
5-183
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