Verifying The Settings And Operation Of The Function - ABB RET670 Commissioning Manual

1MRK 504 154-UUS B
10.5.14.1

Verifying the settings and operation of the function

Reconnection inhibit feature
1. Inject SCB rated current (that is, 0.587A at 50Hz for this SCB) in at least one phase
(preferably perform this test with three phase injection).
2. After couple of seconds stop injection of all currents (that is, set all currents back to 0A).
3. Check that function binary output signal RECNINH is set to logical 1 and that only resets after
the set time under parameter
4. If this binary signal is used to prevent CB closing make sure that it is properly connected/
wired into the CB closing circuit.
Overcurrent feature
1. Inject current 20% bigger than the set overcurrent pickup level under setting parameter
51 (for example, 1.2 · 1.35 · 0.587A = 0951A at 50Hz for this SCB) in phase A only.
2. Check that function binary output signals PU_51_A and PU_OC are set to one.
3. Check that function binary output signals TROC and TRIP are set to one after the set time
under parameter
4. If any of these signals are used for tripping, signaling and/or local/remote indication check
that all relevant contacts and LEDs have operated and that all relevant GOOSE messages
have been sent.
5. Check that service value from the function for current in phase A, on the local HMI under Main
menu/Test is approximately 476A (that is, 0.951A · (500/1) = 476A).
6. Stop injection of all currents (that is, set all currents back to 0A).
7. Check that all above mentioned function binary output signals now have logical value zero.
8. Repeat above steps 1-7 for phase B and phase C.
Undercurrent feature
1. Inject SCB rated current (that is, 0.587A at 50Hz for this SCB) in all three phases.
2. Lower phase A current 10% under the set value for setting parameter
0.587A = 0.370A at 50Hz for this SCB).
3. Check that function binary output signals PU_37_A and PU_UC are set to one.
4. Check that function binary output signals TRUC and TRIP are set to one after the set time
under parameter
Commissioning manual
tReconnInhibit (for example 300s for this SCB) has expired.
Note that during testing the overcurrent feature the harmonic voltage overload
feature or reactive power overload feature may also give pickup and trip signals
depending on their actual settings. Therefore it is best to switch them off during
this test.
tOC (that is, 30s for this SCB) has expired.
Note that the operation of this feature is based on current peak value. That means
that this overcurrent function is also able to trip for the same current magnitude
but for different injected frequencies. If required repeat this injection procedure
for example for the 3rd harmonic by just simply injecting 3 · 50 = 150Hz currents
with the same magnitude. Obtain results shall be the same.
tUC (for example, 5s for this SCB) has expired.
Testing functionality by secondary injection
GUID-81B167DE-7A86-4CBA-86E7-560A6B3EA665 v1
GUID-C3E7B2EA-FF69-4D2B-BBDF-A135A97E4862 v2
GUID-7E1A7532-7A45-4DA2-A0F3-CE300F8A48BF v3
GUID-5C2ED7D0-9BE3-40DC-82C0-C351878D4568 v2
PU_37 (that is, 0.9 · 0.7 ·
Section 10
PU
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