Woodward
Technical Manual WIC1
50
DOK-TD-WIC1E, Rev. L
6.9 Test procedure by way of example
When testing the WIC1, the tests of the individual equipment should be carried out from the highest setting value to
the smallest one. The order ought to be:
1) short circuit I>>
2) over current I>
3) earth current IE>
In here the complete test can only be exemplified with free defined switching points. For the test a single-phase
power source has to be used.
General setting:
Is = Nominal Current of the equipment conditional on the used CT, on which all switching points of I>>, I> and IE>
are based.
CHAR = either Definite Time or Inverse Characteristic
– dependent on the requirement.
Device versions WIC1-1 and WIC1-4 are adjusted via the serial interface by way of a PC. Device versions WIC1-2
are adjusted by way of the DIP switches. Device versions WIC1-3 are adjusted by way of the Hex switches.
Here the test will be performed with the following settings:
Is = 1.15
Char = Definite Time
I> =
1.05 x Is
tI> =
1.00s
I>> = 4.00 x Is
tI>> = 0.10s
IE> = 0.9 xIs
tIE> = 0.2s
Test step 1): Test of the short circuit step I>>. For this the following parameters have to be blocked:
I> =
EXIT
tI>> = EXIT
IE> = EXIT
The single-phase test current has to be increased slowly until the relay or the LED indicator trips (applies only for
relay types WIC1-2/3/4). The tripping current can be controlled by the fault value memory. Since the WIC1 is oper-
ating phase-selectively, each phase can be tested separately.
Test step 2): Test of the trip delay tI>>
Settings:
I>> = 4.00 x Is
tI>> = e.g. 0.10s
During the single-phase test the switching point of the I>> has to be rapidly changed from 90% to 120%. The trip-
ping time is ascertained by an external timer. The jump is to be used as start impulse. The trip impulse coming from
the flag indicator or the tripping coil serves as stop signal.
If a 90% or 120% jump is not possible with the test instrument, then the jump should be from 0 to 120% of the I>>.
Dependent on the test parameter for I>> and the set tripping time for tI>>, the charging and boot time needed by
the relay has to be deducted. See chapter 4.1.2 Phase Over-Current Time Protection.
