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7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 44 of 77
49 Overload Setting
I
θ
is expressed as a multiple of the relay nominal current and is equivalent to the factor k.I
B
as defined in the IEC 60255-149 thermal operating characteristics. It is the value of current above which 100% of
thermal capacity will be reached after a period of time and it is therefore normally set slightly above the full load
current of the protected device.
The thermal state may be reset from the fascia or externally via a binary input.
Thermal overload protection can be inhibited from:
Inhibit 49
A binary or virtual input.
IL1
49 Alarm
49 Trip
49 Time Constant
49 Capacity Alarm
49 Overload Setting
c
cap alarm
trip
IL2
IL3
cap alarm
trip
cap alarm
trip
Inhibit 49
49 Therm. Overload
Enabled
Disabled
&
1
1
Reset 49
r
Figure 3-22 Logic Diagram: Thermal Overload Protection (49)
3.4.9 Voltage Protection: Phase Under/Over Voltage (27/59)
In total four under/over voltage elements are provided
27/59-1, 27/59-2, 27/59-3 & 27/59-4.
The relay utilises fundamental frequency RMS voltage for this function. All under/over voltage elements have a
common setting to measure phase to phase
(Ph-Ph)
or phase to neutral
(Ph-N)
voltage using the
Voltage Input
Mode
setting.
Voltage elements can be blocked if all phase voltages fall below the
27/59 U/V Guard
setting.
27/59-n Setting
sets the pick-up voltage level for the element.
The sense of the element (undervoltage or overvoltage) is set by the
27/59-n Operation
setting.
The
27/59-n O/P Phases
setting determines whether the time delay is initiated for operation of any phase or only
when all phases have detected the appropriate voltage condition. An output is given after elapse of the
27/59-n
Delay
setting.
The
27/59-n Hysteresis
setting allows the user to vary the pick-up/drop-off ratio for the element.
Operation of the under/over voltage elements can be inhibited from:
Inhibit 27/59-n
A binary or virtual input.
27/59-n VTSInhibit:
Yes
Operation of the VT Supervision function
27/59-n U/V Guarded
Under voltage guard element.
Содержание 7SR10 Argus Series
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