5.
Set and apply about 20% higher voltage than the measured operate value for one
phase.
6.
Measure the time delay for the TRST1 signal and compare it with the set value.
7.
Check the inverse time delay by injecting a voltage corresponding to 1.2 ×
Vpickup>.
For example, if the inverse time curve A is selected, the trip signals
TRST1 and TRIP operate after a time corresponding to the equation:
( )
1
1
TD
t s
V
Vpickup
=
æ
ö
-
ç
÷
>
è
ø
ANSIEQUATION2429 V1 EN
(Equation 19)
where:
t(s)
Operate time in seconds
TD1
Settable time multiplier of the function for step 1
V
Measured voltage
Vpickup> Set pickup voltage for step 1
For example, if the measured voltage jumps from 0 to 1.2 times the set pickup
voltage level and time multiplier TD1 is set to 0.05 s (default value), then the TRST1
and TRIP signals operate at a time equal to 0.250 s ± tolerance.
8.
Repeat the test for step
6.4.3.2
Completing the test
Continue to test another function or end the testing by setting the parameter
TestMode
to
Disabled
under
Main menu/Tests/IED test mode/TESTMODE:1
. If another function is
tested, then set the parameter
Blocked
to
No
under
Main menu/Tests/Function test
modes/Voltage/ROV2PTOV(59N,2UN>)/ROV2PTOV:1
for the function, or for each
individual function in a chain, to be tested next. Remember to set the parameter
Blocked
to
Yes
, for each individual function that has been tested.
6.4.4
Loss of voltage check LOVPTUV (27)
Prepare the IED for verification of settings as outlined in
5.1 "Preparing the IED to verify
1MRK 505 293-UUS A
Section 6
Testing functionality
79
Commissioning manual
