This means that if current jumps from 0 to 2 times pickup and negative sequence capability value of
generator K1 is set to 10 sec and current pickup level I2-1> is set to 10% of rated generator
current, then TRST1 and TRIP signals operates at time equal to 250 s ± tolerance.
10. Repeat the above-described tests for the step 2 of the function excluding the inverse time testing.
11. Finally check that pickup and trip information is stored in the event menu.
Example
The CT ratios
for all three phases is 1000 A, IBase is 1000 A, and the following secondary
currents are applied:
IA Ampl = 1.1 A Angl = 15 deg
IB Ampl = 0.6 A Angl = 97 deg
IC Ampl = 1.3 A Angl = -135 deg
The service value output NSCURR indicating amplitude of negative sequence current in primary
amperes should be 962A approximative.
11.5.17.2 Completing the test
GUID-DA67F057-00AD-4391-B50E-047FD6C16EBB v1
Continue to test another functions or end the test by changing the Test mode setting to Off. Restore
connections and settings to their original values, if they were changed for testing purposes. Make sure
that all built-in features for this function, which shall be in operation, are enabled and with correct
settings.
11.5.18 Voltage-restrained time overcurrent protection VRPVOC(51V)
GUID-764DA61A-D987-4358-867A-DA43ADDC6E57 v5
Prepare the IED for verification of settings as outlined in section
"Requirements" and section "Preparing
for test" in this chapter.
11.5.18.1 Function revision history
GUID-9B72080E-B886-4138-B8BC-CCB99C289C87 v1
Document
revision
Product
revision
History
A 2.2.1 -
B 2.2.1 -
C 2.2.2 -
D 2.2.3 -
E 2.2.3 -
F 2.2.4 -
G 2.2.4 -
H 2.2.4 -
J 2.2.5 Previously called settings Characterist and t_DefOC had their names changed to
Characteristic and t_OC for more clear understanding.
1MRK 504 165-UUS Rev. J Section 11
Testing functionality by secondary injection
Transformer protection RET670 197
Commissioning manual
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