4.8
SEL-700G Relay
Instruction Manual
Date Code 20170814
Protection and Logic Functions
Group Settings (SET Command)
I1XC1, I2XC1, and I3XC1 are the fundamental frequency A-phase, B-phase,
and C-phase compensated currents for Winding X. Similarly, I1XC2, I2XC2,
and I3XC2 are the second-harmonic compensated currents for Winding X.
The fourth-harmonic and fifth-harmonic compensated currents use similar
names. The I1-compensated currents are used with differential element 87-1,
I2 with element 87-2, and I3 with element 87-3.
Figure 4.3
Winding X Compensated Currents
Figure 4.4
Differential Element (87-1) Quantities
Figure 4.4 illustrated how the IOP1 (operate), IRT1 (restraint), I1H24
(harmonic restraint), I1H2 (second harmonic), I1H4 (fourth harmonic), and
I1H5 (fifth harmonic) quantities are calculated for the 87-1 element. IOP1 is
generated by summing the winding currents in a phasor addition. IRT1 is
generated by summing the magnitudes of the winding currents in a simple
scalar addition. The 87-2 and 87-3 quantities are calculated in a similar
manner.
I1XC1
I2XC1
I3XC1
I1XC2
I2XC2
I3XC2
I1XC4
I2XC4
I3XC4
IAX
IBX
ICX
Data
Acquisition
Fundamental
Frequency
Filter
TAPX
Scaling
Connection
Compensation
(CTCX)
Second-
Harmonic
Filter
TAPX
Scaling
Connection
Compensation
(CTCX)
Fourth-
Harmonic
Filter
TAPX
Scaling
Connection
Compensation
(CTCX)
I1XC5
I2XC5
I3XC5
Fifth-
Harmonic
Filter
TAPX
Scaling
Connection
Compensation
(CTCX)
IOP1
E87
I1XC1
I1YC1
Σ
ABSOLUTE
I1XC2
I1YC2
I1XC4
I1YC4
IRT1
I1H24
I1H2
I1H4
Σ
h
ABSOLUTE
ABSOLUTE
100/PCT2
100/PCT4
E87
Σ
ABSOLUTE
ABSOLUTE
E87
Σ
I1F2
I1F4
Σ
I1XC5
I1YC5
100/PCT5
E87
Σ
ABSOLUTE
I1F5
I1H5
NOTE:
The SEL-700G restraint
quantity IRTn calculation differs from
the SEL-587 and SEL-387 by a factor
of 2.
Содержание SEL-700G Series
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