46BC-1 Setting 3P Balanced Current (A) 1P Unbalance Current
(A)
Measured Unbalance
Current
Apply 1 A 1P unbalance current without 3P balanced current. Measure 46BC-1 operating time.
46BC-1 Delay Setting Measured
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.
9.9.9
Functional Tests
9.9 Protection Functional Tests
472 Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019
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