Identifying The Function To Test In The Technical Reference Manual; Differential Protection; High Impedance Differential Protection Hzpdif; Verifying The Settings - ABB rec670 Commissioning Manual

1MRK 511 360-UEN A
10.2
10.3
10.3.1
10.3.1.1
Bay control REC670 2.1 IEC
Commissioning manual
Testing functionality by secondary injection
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.
Identifying the function to test in the technical
reference manual
Use the technical manual to identify function blocks, logic diagrams, input and output
signals, setting parameters and technical data.

Differential protection

High impedance differential protection HZPDIF

Prepare the IED for verification of settings outlined in section
verify settings".

Verifying the settings

1. Connect single-phase or three-phase test set to inject the operating voltage. The
injection is done across the measuring branch.
The required trip and alarm voltage, as well as the used
stabilizing resistance value must be set in the function. Note as
well that used CT input in the IED must have ratio set as 1:1. This
is essential for the measurement of the expected value. Normally
a slightly higher operating value is no problem as the sensitivity
is not influenced much.
2. Increase the voltage and make note of the operate value U>Trip. This is done by
manual testing and without trip of the test set.
3. Connect the trip contact to the test set to stop the test set for measurement of trip
times below.
4. Reduce the voltage slowly and make note of the reset value. The reset value must
be high for this function.
5. Check the operating time by injecting a voltage corresponding to 1.2 ˣ U>Trip
level. Make note of the measured trip time.
6. If required, verify the trip time at another voltage. Normally 2 ˣ U>Trip is
selected.
Section 10
"Preparing the IED to
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