7SR210 & 7SR220 Description of Operation
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3.13 Voltage Protection: Phase Under/Over Voltage (27/59) -
7SR22
In total five under/over voltage elements are provided in the 7SR22 relay. Four elements are provided for the
‘Phase’ Voltages and one for the ‘Auxiliary’ input voltage.
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 (27/59-Vx) 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
(
27/59-Vx 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
(
27/59-Vx Delay)
setting.
The
27/59-n Hysteresis
(
27/59-Vx 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, function key or remote data Comms.
27/59-n VTSInhibit:
Yes
Operation of the VT Supervision function.
27/59-n U/V Guarded
Under voltage guard element.
Figure 3.13-1 Logic Diagram: Under/Over Voltage Elements (27/59)
Summary of Contents for Argus 7SR21
Page 1: ...Energy Management 7SR21 7SR22 Argus Overcurrent Relay Reyrolle Protection Devices ...
Page 2: ......
Page 4: ...Contents 7SR11 and 7SR12 Page 2 of 2 2018 Siemens Protection Devices Limited ...
Page 185: ...7SR210 Settings Guide Unrestricted 2018 Siemens Protection Devices Limited Page 61 of 61 ...
Page 277: ...7SR220 Settings Guide Unrestricted Page 72 of 107 2013 Siemens Protection Devices Limited ...
Page 382: ...7SR220 Technical Manual Chapter 4 Page 2 of 96 2017 Siemens Protection Devices Limited ...
Page 386: ...7SR220 Technical Manual Chapter 4 Page 6 of 96 2017 Siemens Protection Devices Limited ...
Page 398: ...7SR220 Technical Manual Chapter 4 Page 18 of 96 2017 Siemens Protection Devices Limited ...
Page 414: ...7SR220 Technical Manual Chapter 4 Page 34 of 96 2017 Siemens Protection Devices Limited ...
Page 466: ...7SR220 Technical Manual Chapter 4 Page 86 of 96 2017 Siemens Protection Devices Limited ...
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