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L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS
CHAPTER 5: SETTINGS
5
LATCH 1 TYPE
— This setting characterizes Latch 1 to be Set- or Reset-dominant.
LATCH 1 SET
— If asserted, the specified FlexLogic operands 'sets' Latch 1.
LATCH 1 RESET
— If asserted, the specified FlexLogic operand 'resets' Latch 1.
Figure 5-106: Non-volatile latch operation table (N = 1 to 16) and logic
5.7 Grouped elements
5.7.1 Overview
Each protection element can be assigned up to six sets of settings with designations 1 to 6. The performance of these
elements is defined by the active setting group at a given time. Multiple setting groups allow the user to conveniently
change protection settings for different operating situations (for example, altered power system configuration or season of
the year). The active setting group can be preset or selected in the
SETTING GROUPS
menu (see the Control Elements section
later in this chapter). See also the Introduction to Elements section at the beginning of this chapter.
5.7.2 Setting group 1
SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
Latch n type Latch n
set
Latch n
reset
Latch n
on
Latch n
off
Reset
Dominant
ON
OFF
ON
OFF
OFF
OFF
Previous
State
Previous
State
ON
ON
OFF
ON
OFF
ON
OFF
ON
Set
Dominant
ON
OFF
ON
OFF
ON
ON
ON
OFF
OFF
OFF
Previous
State
Previous
State
OFF
ON
OFF
ON
SETTING GROUP 1
LINE DIFFERENTIAL
ELEMENTS
See below
PHASE CURRENT
