Element Blocking
The
Broken Conductor
element can be blocked by
Binary Input Inhibit
. This functionality should be
checked.
Element
BI Inhibits
46BC-1
Element Blocking from Current Guard
The elements can be blocked by undercurrent guard function. This functionality should be checked.
Element
Guard Setting
Blocked
46BC-1
47 Sequence Overvoltage Protection
Where 2 NPS voltage elements are being used with different settings, it is convenient to test the elements
with the highest settings first. The elements with lower settings can then be tested without disabling the
lower settings.
NPS overvoltage can be tested using a normal 3P balanced source. 2 phase voltage connections should be
reversed so that the applied balanced 3P voltage is negative phase sequence.
If the 47-n delay is small, gradually increased the applied balanced 3P voltage until element operates.
If DTL is large apply 0.9 times setting, check for no operation, apply 1.1 times setting, check operation.
Apply 2 times setting current if possible and record operating time.
Setting
(Volts)
Delay
(sec)
Hyst.
P.U.
(Volts)
D.O.
(Volts)
Op. Time
@ 2 ⋅ V
set
U/V Guard Tolerance
NPS
Element Blocking
The NPS overvoltage element can be blocked by
Binary Input Inhibit
. This functionality should be
checked.
Element
BI Inhibits
47-1
47-2
Check correct indication, trip output, alarm contacts, waveform record.
Undervoltage Guard (47 U/V Guard)
If any 47 NPS overvoltage element is set to be inhibited by the 47 undervoltage guard element, this function
should be tested.
Connect the test voltage inputs to suit the installation wiring diagram utilizing any test socket facilities avail-
able. It may be useful to temporarily map an LED as
General Pickup
to assist during testing. 47UVG opera-
tion will reset the
General Pickup
if no other element is operated. This LED should not be set as
Hand
Reset
in the output matrix.
Starting from nominal voltage, apply a step decrease to the applied voltage to a level below the 47 NPS
voltage setting but above the 47UVG setting such that an NPS overvoltage element operation occurs. Slowly
reduce the applied voltage until the 47 NPS voltage element resets, this can be detected by the
General
Pickup
LED reset if no other element is operated (this includes any undervoltage element which is not UV
guarded).
Phase
Setting (Volts)
Tolerence
V Element Used
for Test
Blocked Volts
Notes
UVG
9.10.9
Functional Tests
9.10 Protection Functional Tests
Reyrolle 7SR5, Transformer Protection Device, Device Manual
429
C53000-G7040-C015-1, Edition 11.2019
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