Parameter Value
Description
No
The element is not inhibited by the autoreclose
sequence design.
Yes
The element will be inhibited during any autoreclose
shot which is designated as
Delayed
. Incorrect
configuration can result in no protection being
enabled.
Settings Example
There should be little or no current flowing to earth in a healthy system so earth fault relays can be given far
lower pickup levels than relays which detect excess current above load current in each phase conductor. Earth
fault relays are important where the fault path to earth is a high-resistance one (such as in highly arid areas) or
where the system uses high values of earthing resistor/reactance as any earth fault current that flows in the
phase conductors will be limited.
Settings Menu
Functions > Function Config
Parameter
Range
Settings
Default Gn1
Gn2
Gn3
Gn4
51G Earth Fault
Enabled
Disabled
Disabled
Functions > Protection > 51G > Gn 51G-n
Parameter
Setting Options
Settings
Default Gn1
Gn2
Gn3
Gn4
Element
Enabled
Disabled
Disabled
Measurement
RMS
Fundamental
RMS
Dir.Control
9
Non-Dir
Forward
Reverse
Non-Dir
Setting
0.005 to 0.1 ⋅ I
rated
, Δ 0.001
I
rated
0.105 to 1 ⋅ I
rated
, Δ 0.005
I
rated
0.5 ⋅
I
rated
Char
DTL
IEC-NI
IEC-VI
IEC-EI
IEC-LTI
ANSI-EI
ANSI-MI
ANSI-VI
IEC-NI
Time Mult (IEC/ANSI)
0.01 to 1.6, Δ 0.01
1.6 to 5, Δ 0.1
5 to 100, Δ 1
1
5.15.5
9
Applies only to devices with VT inputs.
Protection and Automation Functions
5.15 51G Time-Delayed Earth Fault – Measured
252
Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019
Содержание Reyrolle 7SR5
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