GE C70 Instruction Manual page 310

GROUPED ELEMENTS
The negative-sequence time overcurrent element can be used to determine and clear unbalance in the system. The input
for calculating negative-sequence current is the fundamental phasor value.
Two methods of resetting operation are available; "Timed" and "Instantaneous" (see the Inverse TOC Curve Characteristics
section earlier for details on curve setup, trip times and reset operation). 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.
5
5.7.6.3 Negative sequence instantaneous overcurrent (ANSI 50Q, IEC PIOC)
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  NEGATIVE SEQUENCE CURRENT  NEG SEQ OC1
 NEG SEQ IOC1

5-186
NEG SEQ TOC1

TD MULTIPLIER: 1.00
NEG SEQ TOC1

RESET: Instantaneous
NEG SEQ TOC1 BLOCK:

Off
NEG SEQ TOC1

TARGET: Self-reset
NEG SEQ TOC1

EVENTS: Disabled
Figure 5-90: Negative sequence TOC1 logic
NEG SEQ IOC1

FUNCTION: Disabled
NEG SEQ IOC1 SIGNAL

SOURCE: SRC 1
NEG SEQ IOC1

PICKUP: 1.000 pu
NEG SEQ IOC1 PICKUP

DELAY: 0.00 s
NEG SEQ IOC1 RESET

DELAY: 0.00 s
NEG SEQ IOC1 BLOCK:

Off
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
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
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: 0.000 to 30.000 pu in steps of 0.001
Range: 0.00 to 600.00 s in steps of 0.01
Range: 0.00 to 600.00 s in steps of 0.01
Range: FlexLogic operand