ABB RER670 - Identifying the Function to Test in the Technical Reference Manual; Differential Protection; Restricted Earth Fault Protection, Low Impedance REFPDIF; Verifying the Settings

When the IED is brought into normal service it is recommended to delete all events
resulting from commissioning tests to avoid confusion in future fault analysis. All
events in the IED can be cleared in the local HMI under Main Menu//Clear/Clear
internal event list or Main menu/Clear/Clear process event list. It is not
possible to clear the event lists from PCM600.
When testing binary inputs, the event list (EL) might be used instead. No uploading
or analyzing of registrations is then needed since the event list keeps running,
independent of start of disturbance registration.
10.2 Identifying the function to test in the technical
reference manual
M11748-2 v4
Use the technical manual to identify function blocks, logic diagrams, input and
output signals, setting parameters and technical data.
10.3 Differential protection
IP10805-1 v1
10.3.1 Restricted earth fault protection, low impedance REFPDIF
SEMOD55252-82 v8
Prepare the IED for verification of settings outlined in Section
"Preparing the IED
to verify settings".
Logical signals for REFPDIF protection are available on the local HMI under
Main menu/Settings/IED Settings/Differential protection/LowImpREF(87N,
IdN/I)/REFPDIF (87N; IdN/I):x, , where x = 1 and 2.
The Signal Monitoring in PCM600 shows the same signals that are available on the
local HMI.
10.3.1.1 Verifying the settings
SEMOD55252-86 v11
1. Connect the test set for single-phase current injection to the protection
terminals connected to the CT in the power transformer neutral-to-earth
circuit.
2. Increase the injection current more than the IdMin setting and note the
operating value of the protection function.
3. Check that all trip and start signals appear according to the configuration
logic.
4. Decrease the current slowly from operate value and note the reset value.
5. Connect the timer and set the current to ten times the value of the IdMin
setting.
6. Switch on the current and note the operate time.
1MRK 506 377-UEN C Section 10
Testing functionality by secondary injection
Railway application RER670 2.2 IEC 77
Commissioning manual