Negative Sequence Current - GE C70 Instruction Manual

CHAPTER 5: SETTINGS
The ground instantaneous overcurrent element can be used as an instantaneous element with no intentional delay or as a
definite time element. The ground current input is the quantity measured by the ground input CT and is the fundamental
phasor magnitude.
These elements measure the current that is connected to the ground channel of a CT/VT module. The
conversion range of a standard channel is from 0.02 to 46 times the CT rating.
NOTE
SETTING
GROUND IOC1
FUNCTION:
Enabled = 1
SETTING
GROUND IOC1
SOURCE:
IG
SETTING
GROUND IOC1
BLOCK:
Off = 0

5.7.6 Negative sequence current

5.7.6.1 Menu
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  NEGATIVE SEQUENCE CURRENT
 NEGATIVE SEQUENCE
 CURRENT
5.7.6.2 Negative sequence time overcurrent (ANSI 51Q, IEC PTOC)
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  NEGATIVE SEQUENCE CURRENT  NEG SEQ TOC1
 NEG SEQ TOC1

C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
Figure 5-89: Ground IOC1 logic
SETTING
GROUND IOC1
PICKUP:
AND RUN
IG PICKUP
 NEG SEQ TOC1


 NEG SEQ TOC2


 NEG SEQ IOC1


 NEG SEQ IOC2


 NEG SEQ DIR OC1


 NEG SEQ DIR OC2


NEG SEQ TOC1

FUNCTION: Disabled
NEG SEQ TOC1 SIGNAL

SOURCE: SRC 1
NEG SEQ TOC1

PICKUP: 1.000 pu
NEG SEQ TOC1

CURVE: IEEE Mod Inv
FLEXLOGIC OPERANDS
GROUND IOC1 PKP
GROUND IOIC DPO
GROUND IOC1 OP
SETTINGS
GROUND IOC1 PICKUP
DELAY:
GROUND IOC1 RESET
DELAY:
t
PKP
t
RST
See below
See page 5-186
See page 5-187
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: see Overcurrent Curve Types table
GROUPED ELEMENTS
827037A5.VSD
5
5-185