GE L90 Instruction Manual page 437

CHAPTER 5: SETTINGS
— This setting specifies the operating threshold for the effective operating signal of the element. If
FLEXELEMENT 1 PICKUP
set to "Over," the element picks up when the operating signal exceeds the
element picks up when the operating signal falls below the
— This setting controls the element dropout. Notice that both the operating signal and the
FLEXELEMENT 1 HYSTERESIS
pickup threshold can be negative, facilitating applications such as reverse power alarm protection. The FlexElement can be
programmed to work with all analog actual values measured by the relay. The
per-unit values using the following definitions of the base units.
Table 5-27: FlexElement base units
Unit
87L SIGNALS
(Local IA Mag, IB, and IC)
(Diff Curr IA Mag, IB, and IC)
(Terminal 1 IA Mag, IB, and IC)
(Terminal 2 IA Mag, IB and IC)
87L SIGNALS
(Op Square Curr IA, IB, and IC)
(Rest Square Curr IA, IB, and IC)
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
Figure 5-107: FlexElement input mode setting
FLEXELEMENT 1 PICKUP
Description
I = maximum primary RMS value of the +IN and –IN inputs
BASE
(CT primary for source currents, and 87L source primary current for line differential currents)
BASE = Squared CT secondary of the 87L source
value. If set to "Under," the
FLEXELEMENT 1 PICKUP
value.
setting is entered in
FLEXELEMENT 1 PICKUP
FLEXLOGIC
5
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