GE T60, Instruction Manual

Page: 323 / 796

GE Multilin T60 Transformer Protection System 5-177
5 SETTINGS 5.5 FLEXLOGIC
5
Figure 5–67: FLEXELEMENT INPUT MODE SETTING
The
FLEXELEMENT 1 PICKUP
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.
The
FLEXELEMENT 1 HYSTERESIS
setting controls the element dropout. It should be noticed 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
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
DCmA BASE = maximum value of the DCMA INPUT MAX setting for the two transducers configured
under the +IN and –IN inputs.
DELTA TIME BASE = 1 µs
FREQUENCY f
BASE
= 1 Hz
FREQUENCY RATE OF CHANGE df/dt
BASE
= 1 Hz/s
PHASE ANGLE ϕ
BASE
= 360 degrees (see the UR angle referencing convention)
842706A2.CDR
FlexElement 1 OpSig
FLEXELEMENT 1 PKP
FLEXELEMENT
DIRECTION = Over;
FLEXELEMENT INPUT
MODE = Signed;
FlexElement 1 OpSig
FLEXELEMENT 1 PKP
FLEXELEMENT
DIRECTION = Over;
FLEXELEMENT INPUT
MODE = Absolute;
FlexElement 1 OpSig
FLEXELEMENT 1 PKP
FLEXELEMENT
DIRECTION = Under;
FLEXELEMENT INPUT
MODE = Signed;
FlexElement 1 OpSig
FLEXELEMENT 1 PKP
FLEXELEMENT
DIRECTION = Under;
FLEXELEMENT INPUT
MODE = Absolute;