GROUPED ELEMENTS
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.
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.
5
5.7.11 Negative sequence current
5.7.11.1 Menu
SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) NEGATIVE SEQUENCE CURRENT
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)
NEG SEQ TOC1
5-246
Figure 5-136: Ground IOC1 logic
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
See below
See page 5-247
See page 5-248
Range: Disabled, Enabled
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS