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Table 267:
(F)DPHLPDOC Technical revision history
Technical revision
Change
B
Added a new input
NON_DIR
C
Step value changed from 0.05 to 0.01 for the
Time
multiplier setting.
D
Monitored data VMEM_USED indicating voltage
memory use.
E
Internal improvement.
4.1.3
Three-phase thermal protection for feeders, cables and
distribution transformers T1PTTR
4.1.3.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase thermal protection for
feeders, cables and distribution
transformers
T1PTTR
3lth>
49F
4.1.3.2
Function block
A070691 V3 EN
Figure 135:
Function block
4.1.3.3
Functionality
The increased utilization of power systems closer to the thermal limits has generated
a need for a thermal overload function for power lines as well.
A thermal overload is in some cases not detected by other protection functions, and the
introduction of the three-phase thermal protection for feeders, cables and distribution
transformers function T1PTTR allows the protected circuit to operate closer to the
thermal limits.
An alarm level gives an early warning to allow operators to take action before the line
trips. The early warning is based on the three-phase current measuring function using
a thermal model with first order thermal loss with the settable time constant. If the
Section 4
1MRS758755 A
Protection functions
252
REC615 and RER615
Technical Manual
Содержание RELION Series
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