Chapter 1) 7SR158 Description of Operation
©2014 Siemens Protection Devices Limited Chapter 1) Page 25 of 38
3.4
Voltage Protection: Vector Shift (78)
Voltage Vector Shift detects a phase ‘jump’ (vector shift) in all three system voltages over a half-cycle window.
The function is used to detect ‘islanding’ or loss of connection between a generator and the main utility supply.. If
the detected vector shift is greater than setting on all three measured voltages an output is issued. Operation of
the element is instantaneous – the vector shift occurs once and then the voltage stabilises – so a delayed
operation is not applicable. Phase detection by means of zero-crossing measurement is used to maximise speed
of operation.
Two elements are provided
78-1 & 78-2.
All elements will be blocked if all phase voltages fall below the
78 U/V Guard
setting.
There is an absolute cut-off of vector shift measurement at 30°.
78-n Setting
sets the pick-up phase shift angle for the element. The phase shift must be detected in all 3 phase-
neutral voltages for the element to pick-up. This feature can be used when the ‘CT/VT CONFIG > Phase Voltage
Config’ setting is selected to ‘Van,Vbn,Vcn’ or ‘Vab,Vbc,3Vo’.
Operation of the elements is instantaneous.
Operation of the voltage vector shift elements can be inhibited from:
Inhibit 78-n
A binary or virtual input.
78 U/V Guard (Ph-N)
Under voltage guard element.
User Inhibit
Reylogic (graphical logic)
Figure 3-4 Logic Diagram: Vector Shift (78)
Содержание 7SR158 Argus
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