GE C70 User Manual

5-220 C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS CHAPTER 5: SETTINGS
5
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.
Figure 5-112: Negative sequence TOC1 logic
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 TOC1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled

NEG SEQ TOC1
EVENTS: Disabled
Range: Disabled, Enabled
 NEG SEQ IOC1


NEG SEQ IOC1
FUNCTION: Disabled
Range: Disabled, Enabled

NEG SEQ IOC1 SIGNAL
SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6

NEG SEQ IOC1
PICKUP: 1.000 pu
Range: 0.020 to 30.000 pu in steps of 0.001

NEG SEQ IOC1 PICKUP
DELAY: 0.00 s
Range: 0.00 to 600.00 s in steps of 0.01

NEG SEQ IOC1 RESET
DELAY: 0.00 s
Range: 0.00 to 600.00 s in steps of 0.01

NEG SEQ IOC1 BLOCK:
Off
Range: FlexLogic operand

NEG SEQ IOC1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled

NEG SEQ IOC1
EVENTS: Disabled
Range: Disabled, Enabled

GE C70 Specifications

General

Brand	GE
Model	C70
Category	Protection Device
Language	English