7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 45 of 77
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 3-23 Logic Diagram: Under/Over Voltage Elements (27/59)
3.4.10 Voltage Protection: Negative Phase Sequence Overvoltage (47NPS)
Negative phase sequence (NPS) voltage (V2) is a measure of the quantity of unbalanced voltage in the system.
The relay derives the NPS voltage from the three input voltages (VL1, VL2 and VL3).
Two elements are provided
47-1 & 47-2.
Voltage elements can be blocked if all phase voltages fall below the
47 U/V Guard
setting.
47-n Setting
sets the pick-up voltage level for the element.
The
47-n Hysteresis
setting allows the user to vary the pick-up/drop-off ratio for the element.
An output is given after elapse of the
47-n Delay
setting.
Operation of the negative phase sequence voltage elements can be inhibited from:
Inhibit 47-n
A binary or virtual input.
47-n U/V Guarded
Under voltage guard element.
Inhibit 47-n
47-n Element
Enabled
Disabled
47-n
47-n Delay
&
c
47-n Hysteresis
>
47-n Setting
VL1
VL2
VL3
NPS
Filter
V2
General Pickup
Figure 3-24 Logic Diagram: NPS Overvoltage Protection (47)
Содержание 7SR10 Argus Series
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