2.4 Time Overcurrent Protection for Phase and Residual Currents
165
7UT613/63x Manual
C53000-G1176-C160-2
If under address
2225
TOC DROP-OUT
the
Disk Emulation
are set, dropout is pro-
duced in accordance with the dropout characteristic, as set out in the functional de-
scription of the inverse time overcurrent protection in section „Dropout Behaviour“.
Overcurrent Stages
I
p
with ANSI char-
acteristics
The inverse time stage, depending on the configuration of the functional scope
enables the user to select different characteristics.
With the ANSI characteristics (address
120
DMT/IDMT Phase
=
TOC ANSI
) the fol-
lowing is made available in address
2027
ANSI CURVE
:
•
Definite Inv.
,
•
Extremely Inv.
,
•
Inverse
,
•
Long Inverse
,
•
Moderately Inv.
,
•
Short Inverse
, and
•
Very Inverse
The characteristics and the formulas on which they are based, are listed in the „Tech-
nical Data“.
If the inverse time trip characteristic is selected, it must be noted that a safety factor
of about 1.1 has already been included between the pickup value and the setting
value. This means that a pickup will only occur if a current of about 1.1 times of the
setting value is present.
The current value is set under address
2021
Ip
or
2022
Ip
. The maximum operating
current is of primary importance for the setting. Pickup due to overload should never
occur, since the device, in this modem, operates as fault protection with correspond-
ingly short tripping times and not as overload protection.
The corresponding time multiplier is set at address
2024
D Ip
. It must be coordinated
with the time grading of the network.
The time multiplier can also be set to
∞
. If set to infinity, the pickup of this function will
be indicated but the stage will not trip after pickup. If the I
p
stage is not required at all,
select address
120
DMT/IDMT Phase
=
Definite Time
.
If disk emulation is set in address
2025
TOC DROP-OUT
, dropout is produced accord-
ing to the dropout characteristic. For further information refer to section „Dropout Be-
haviour“ (see section 2.4.1, margin heading „Dropout Behaviour“).
Dynamic Cold Load
Pickup
An alternative set of pickup values can be set for each stage. It may be selected au-
tomatically in a dynamic manner during operation (see section 2.6).
Summary of Contents for SIPROTEC 7UT613 series
Page 16: ...Contents 16 7UT613 63x Manual C53000 G1176 C160 2 Literature 631 Glossary 623 Index 633 ...
Page 30: ...1 Introduction 30 7UT613 63x Manual C53000 G1176 C160 2 ...
Page 506: ...A Appendix 506 7UT613 63x Manual C53000 G1176 C160 2 7UT633 D E ...
Page 508: ...A Appendix 508 7UT613 63x Manual C53000 G1176 C160 2 7UT633 P Q ...
Page 510: ...A Appendix 510 7UT613 63x Manual C53000 G1176 C160 2 7UT635 D E ...
Page 512: ...A Appendix 512 7UT613 63x Manual C53000 G1176 C160 2 7UT635 P Q ...
Page 515: ...A 2 Terminal Assignments 515 7UT613 63x Manual C53000 G1176 C160 2 7UT633 B ...
Page 517: ...A 2 Terminal Assignments 517 7UT613 63x Manual C53000 G1176 C160 2 7UT633 N ...
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Page 622: ...A Appendix 622 7UT613 63x Manual C53000 G1176 C160 2 ...
Page 632: ...Literature 632 7UT613 63x Manual C53000 G1176 C160 2 ...