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7SR11 & 7SR12 Description Of Operation
Chapter 1 Page 54 of 88 ©2017 Siemens Protection Devices Limited
3.12 Voltage Protection: Phase Under/Over Voltage (27/59) –
7SR12
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 (7SR1205 & 7SR1206).
27/59-n U/V Guarded
Under voltage guard element.
``````````````````````````````````````````````````````````````````````````````
Any
(≥
1)
All (&)
or
> <
or
> <
or
> <
General Pickup
27/59-n
Inhibit 27/59-n
27/59-n Hysteresis
27/59-n Delay
27/59-n O/P Phases
c
&
27/59-n Setting
27/59-n Operation
27/59-n
Enabled
Disabled
27/59-n VTS Inhibit
Yes
VT Fail
&
27/59 U/V Guarded
Yes
&
Voltage
Input
Mode
VL1
VL2
VL3
<
&
27/59 U/V Guard
Setting
PH-PH
Or
PH-N
<
<
Figure 3-27 Logic Diagram: Under/Over Voltage Elements (27/59)
Summary of Contents for Argus 7SR11
Page 1: ...Energy Management 7SR11 7SR12 Argus Overcurrent Relay Reyrolle Protection Devices ...
Page 2: ......
Page 4: ...7SR11 7SR12 Argus Contents 2015 Siemens Protection Devices Limited Page 2 of 2 ...
Page 170: ...7SR120 Technical Manual Chapter 4 Page 2 of 84 2017 Siemens Protection Devices Limited ...
Page 174: ...7SR120 Technical Manual Chapter 4 Page 6 of 84 2017 Siemens Protection Devices Limited ...
Page 196: ...7SR120 Technical Manual Chapter 4 Page 28 of 84 2017 Siemens Protection Devices Limited ...
Page 242: ...7SR120 Technical Manual Chapter 4 Page 74 of 84 2017 Siemens Protection Devices Limited ...
Page 244: ...7SR120 Technical Manual Chapter 4 Page 76 of 84 2017 Siemens Protection Devices Limited ...
Page 246: ...7SR120 Technical Manual Chapter 4 Page 78 of 84 2017 Siemens Protection Devices Limited ...
Page 254: ...7SR11 7SR12 Installation Guide Chapter 5 Page 2 of 32 2017 Siemens Protection Devices Limited ...
Page 358: ...7SR11 7SR12 Applications Guide Page 2 of 48 2017 Siemens Protection Devices Limited ...
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