Completing The Test - ABB RET670 Commissioning Manual

1MRK 504 154-UUS B
7. Connect a trip output contact to a timer.
8. Set the current to 200 % of the pickup level of the step 1, switch on the current and check the
definite time delay for trip signals TRST1 and TRIP. Once the measured negative sequence
current exceeds the set pickup level
trip signals is released after the set time delay has elapsed. The same test must be carried
out to check the accuracy of definite time delay for ALARM signal.
Note: The output ALARM is operated by PICKUP signal.
9. If inverse time is selected the trip signals TRST1 and TRIP operates after a time
corresponding to the formula:
This means that if current jumps from 0 to 2 times pickup and negative sequence capability
value of generator
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
currents are applied:
IA
IB
IC
The service value output NSCURR indicating amplitude of negative sequence current in primary
amperes should be 962A approximative.
10.5.15.2

Completing the test

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.
10.5.16 Voltage-restrained time overcurrent protection VRPVOC(51V)
Prepare the IED for verification of settings as outlined in section
section "Preparing for test"
Commissioning manual
t s
K1 is set to 10 sec and current pickup level I2-1> is set to 10% of rated
CTprim
CT sec
for all three phases is 1000 A,
Ampl = 1.1 A
Ampl = 0.6 A
Ampl = 1.3 A
in this chapter.
I2-1> , the settable definite timer t1 starts to count and
1
 
 
2
I 2 1
− >
 
 
 
 100 
 
[ ]
=
2
 
( )
Multiple of Pickup
 
 
 
IBase is 1000 A, and the following secondary
Testing functionality by secondary injection
⋅ ⋅ K
Angl = 15 deg
Angl = 97 deg
Angl = -135 deg
GUID-DA67F057-00AD-4391-B50E-047FD6C16EBB v1
GUID-764DA61A-D987-4358-867A-DA43ADDC6E57 v5
"Requirements" and
Section 10
163