CHAPTER 5: SETTINGS
FLEXLOGIC
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
5-187
5
Figure 5-96: FlexElement input mode setting
FLEXELEMENT 1 PICKUP
— This setting specifies the operating threshold for the effective operating signal of the element. If
set to “Over,” the element picks up when the operating signal exceeds the
FLEXELEMENT 1 PICKUP
value. If set to “Under,” the
element picks up when the operating signal falls below the
FLEXELEMENT 1 PICKUP
value.
FLEXELEMENT 1 HYSTERESIS
— This setting controls the element dropout. Notice that both the operating signal and the
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
FLEXELEMENT 1 PICKUP
setting is entered in
per-unit values using the following definitions of the base units.
Table 5-23: FlexElement base units
Unit
Description
BREAKER ACC ARCING AMPS
(Brk X Acc Arc Amp A, B, and C)
BASE = 2000 kA
2
×
cycle
BREAKER ARCING AMPS
(Brk X Arc Amp A, B, and C)
BASE = 1 kA
2
×
cycle
BUS DIFFERENTIAL RESTRAINING
CURRENT
(Bus Diff Mag)
I
BASE
= maximum primary RMS value of the +IN and –IN inputs
(CT primary for source currents, and bus reference primary current for bus differential currents)
Summary of Contents for b30
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