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6.12.6.3
Settings
Addr.
Fast stage #
_:1
_:2
_:3
_:4
_:6
6.12.6.4
Information List
No.
Fast stage #
_:81
_:54
_:52
_:53
_:55
_:56
_:57
Application Example: High-Impedance Restricted Ground-Fault Protection
6.12.7
6.12.7.1
Description
With the high-impedance method, all current transformers operate in parallel at the limits of the protection
range on a common, relatively high-impedance resistor R, the voltage of which is measured.
The current transformers must be of the same type of construction and have at least one core of their own for
the High-impedance restricted ground-fault protection. Furthermore, they must have the same transfer ratio
and approximately the same knee-point voltage.
The high-impedance principle is especially suited for ground-fault detection in grounded networks at trans-
formers, generators, motors, and shunt reactors.
The left part of
motor/generator. The example at the right shows an ungrounded transformer winding or an ungrounded
motor/generator. In this example, it is assumed that the network is grounded at a different point.
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
Parameter
Fast stage #:Mode
Fast stage #:Operate &
flt.rec. blocked
Fast stage #:Threshold
Fast stage #:Dropout
ratio
Fast stage #:Operate
delay
Information
Fast stage #:>Block stage
Fast stage #:Inactive
Fast stage #:Behavior
Fast stage #:Health
Fast stage #:Pickup
Fast stage #:Operate delay expired
Fast stage #:Operate
Figure 6-104
shows an application example for a grounded transformer winding or a grounded
C
Setting Options
•
off
•
on
•
test
•
no
•
yes
1 A @ 100 Irated 0.030 A to 35.000 A
5 A @ 100 Irated 0.15 A to 175.00 A
1 A @ 50 Irated
0.030 A to 35.000 A
5 A @ 50 Irated
0.15 A to 175.00 A
1 A @ 1.6 Irated
0.001 A to 1.600 A
5 A @ 1.6 Irated
0.005 A to 8.000 A
0.90 to 0.99
0.00 s to 60.00 s
Protection and Automation Functions
6.12 Overcurrent Protection, 1-Phase
Default Setting
off
no
10.000 A
50.00 A
10.000 A
50.00 A
10.000 A
50.000 A
0.90
0.00 s
Data Class
Type
(Type)
SPS
I
SPS
O
ENS
O
ENS
O
ACD
O
ACT
O
ACT
O
535
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