Siemens Reyrolle 7SR45 Argus Device Manual page 59

This setting is used to allow the element to be switched on and off if it is not required. A separate setting is
provided for each element. These settings can be used to select the number of elements required.
Parameter State
Disabled
Enabled
Gn 50G-n Setting
Default setting: 1.0 ⋅ I
This setting defines the operating current threshold of the element. The applied current must exceed this
setting by a factor of 1.00x for pickup of the element. The operation timing will then be dependent on the
selected delay for the element setting. The element pickup will reset when the current is reduced under
following conditions:
•
0.2 ⋅ I to 0.9 ⋅ I
rated
•
1.0 ⋅ I to 20.0 ⋅ I
rated
This setting should be set to suit the individual application
Gn 50G-n Delay
Default setting: 0.0 s
This setting is set to suit the individual application.
Gn 50G-n Inrush Action
Default setting: Off
High levels of inrush currents into reactive components, for example transformers; when they are switched in
can result in operation of overcurrent elements. The inrush current can be detected by a high percentage of
second harmonic current content by the 81HBL2 element. This parameter can be configured to inhibit the
overcurrent element automatically by configuration of this setting.
Parameter Value
Off
Inhibit
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
CONFIGURATION > FUNCTION CONFIG
Parameter
Gn Measured E/F
CONFIGURATION > CURRENT PROT'N > MEASURED E/F > 50G-n
Parameter
Gn 50G-n Element
Reyrolle, 7SR45, Device Manual
C53000-G7040-C101-2, Edition 09.2020
Description
The element is inactive.
The element is active.
rated
is ≥ 90 % I
rated op
is ≥ 94 % I
rated op
Description
The earth fault element is not inhibited by operation of the 81HBL2 element
The earth fault element is inhibited by operation of the 81HBL2 element and
automatically released when the 81HBL2 element resets.
Setting Options
Disabled
Enabled
Setting Options
Disabled
Enabled
3.6 Instantaneous Measured Earth Fault Protection (50G)
Settings
Default Gn1
Disabled –
Settings
Default Gn1
Disabled –
Functions
Gn2
–
Gn2
–
59