Restricted Ground-Fault Protection
Setting Values
Threshold value
142
0.05 A to 2.00 A Increments of 0.01 A
Gradient 0.00 to 0.95 Increments of 0.01
Operate curve See figure
Pickup tolerance
(for preset characteristic curve parameters; for 2 sides
with 1 measuring point each)
2 %
Tripping delay 0.00 s to 60.00 s or ∞
(no tripping)
Increments of 0.01 s
Timer tolerance 1 % of the setting value or 10 ms
Functional Measured Values
Measured Value Description
(_:306) I REF,operate Operate quantity of the restricted ground-fault protection from
the angle criterion
(_:307) I Angle,REF Stabilizing value (angle) of the restricted ground-fault protection
from the angle criterion
(_:311) I REF,Trip operate Operate quantity of the restricted ground-fault protection when
OFF
(_:312) I angle,REF operate Stabilizing value of the restricted ground-fault protection when
OFF
(_:301) I diff. Differential current
(_:302) I restr. Restraint current
Dropout Ratio
Threshold value
0.7
Dropout
The greater dropout differential (= | pickup value – dropout value |) of the following 2 criteria
applies:
Dropout differential derived from the parameter
Dropout ratio
If this parameter is not available, a dropout ratio of 95 % applies for overcurrent and of 105 % for undercur-
rent functionality.
Minimum absolute dropout differential
Protection-class current transformer 15 mA sec. (I
rated
= 1 A) or
75 mA sec. (I
rated
= 5 A)
Instrument current transformer 0.5 mA sec. (I
rated
= 1 A) or
2.5 mA sec. (I
rated
= 5 A)
Times
7UT82/7UT85/7UT86/7UT87
Frequency 50 Hz 60 Hz
Operate time Operate time
12.50
142
The specified setting limit can be dynamically further limited, depending on the transformer adaptation factor, (for this refer to
chapter 6.43.4 Application and Setting Notes).
Technical Data
12.50 Restricted Ground-Fault Protection
SIPROTEC 5, Overcurrent Protection, Manual 1539
C53000-G5040-C017-8, Edition 07.2017
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