4.3.2.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The corresponding
parameter values are “Enable” and “Disable”.
The operation of 87T can be described by using a module diagram. All the modules in the
diagram are explained in the next sections.
BLK_OPR_LS
BLK_OPR_HS
Biased
low stage
Instantaneous
high stage
TRIP
OPR_LS
OPR_HS
BLKD2H
BLKD5H
BLKDWAV
OR
Compensation
of tap changer
position
Second
harmonic
blocking
Fifth harmonic
blocking
Waveform
blocking
Differential
calculation
Transformer
vector group
matching
Zero-
sequence
component
elimination
BLOCK
I_A1
I_B1
I_C1
I_A2
I_B2
I_C2
TAP_POS
GUID-C4FFDFA8-A197-4983-87D4-A6A426FE1BF1 V1 EN
Figure 248:
Functional module diagram
Differential calculation
87T operates phase-wise on a difference of incoming and outgoing currents. The positive
direction of the currents is towards the protected object.
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
501
Technical Manual
Summary of Contents for Relion 615 series
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