Four Step Non-Directional Residual Overcurrent Protection; Completing The Test; Thermal Overload Protection, Two Time Constants Trpttr; Checking Operate And Reset Values - ABB ret650 Commissioning Manual

Section 6
Testing functionality
6.4.4.2
6.4.4.3
6.4.5
6.4.5.1
48
11. Check that the protection does not operate when the polarizing voltage is zero.
12. Repeat the above described tests for the higher set steps.
13. Finally, check that start and trip information is stored in the event menu.

Four step non-directional residual overcurrent protection

1. Do as described in
but without applying any polarizing voltage.

Completing the test

Continue to test another function or end the testing by setting the parameter
TestMode to Off under Main menu/Tests/IED test mode/1:TESTMODE. If
another function is tested, then set the parameter Blocked to No under Main menu/
Tests/Function test modes/Current/EF4PTOC(51N67N,4IN>)/X:EF4PTOC
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.

Thermal overload protection, two time constants TRPTTR

Prepare the IED for verification of settings as outlined in
verify settings".
Values of the logical signals for TRPTTR are available on the local HMI under
Main menu/Tests/Function status/Current/TRPTTR(49,T>)/X:TRPTTR. The
Signal Monitoring in PCM600 shows the same signals that are available on the
local HMI.

Checking operate and reset values

1. Connect symmetrical three-phase currents to the appropriate current terminals
of the IED.
2. Set the Time constant 1 (Tau1) and Time Constant 2 (Tau2) temporarily to 1
minute.
3. Set the three-phase injection currents slightly lower than the set operate value
of stage IBase1, increase the current in phase L1 until stage IBase1 operates
and note the operate value.
Observe the maximum permitted overloading of the current
circuits in the IED.
4. Decrease the current slowly and note the reset value.
"Four step directional residual overcurrent
1MRK 504 126-UEN -
protection",
5.1 "Preparing the IED to
Commissioning Manual