GE D30 User Manual

5-246 D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS CHAPTER 5: SETTINGS
5
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.
Figure 5-136: Ground IOC1 logic
5.7.11 Negative sequence current
5.7.11.1 Menu
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  NEGATIVE SEQUENCE CURRENT
The D30 provides two negative-sequence time overcurrent elements, two negative-sequence instantaneous overcurrent
elements, and two negative-sequence directional overcurrent elements. For information on the negative sequence time
overcurrent curves, see the Inverse TOC Curve Characteristics section earlier.
5.7.11.2 Negative sequence time overcurrent (ANSI 51Q, IEC PTOC)
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  NEGATIVE SEQUENCE CURRENT  NEG SEQ TOC1(2)
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.
This channel can be equipped with a standard or sensitive input. The conversion range of a sensitive channel is
from 0.002 to 4.6 times the CT rating.
 NEGATIVE SEQUENCE
 CURRENT

 NEG SEQ TOC1

See below

 NEG SEQ TOC2


 NEG SEQ IOC1

See page 5-247

 NEG SEQ IOC2


 NEG SEQ DIR OC1

See page 5-248

 NEG SEQ DIR OC2

 NEG SEQ TOC1


NEG SEQ TOC1
FUNCTION: Disabled
Range: Disabled, Enabled

GE D30 Specifications

General

Brand	GE
Model	D30
Category	Relays
Language	English