ABB Relion 670 Series Commissioning Manual page 147

1MRK 511 403-UUS Rev. K
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2. The logical signals and service values for SCUCPTOC function are available on the local HMI under:
Main menu/Tests/Function status/Unbalance protection /CapBankCurrentUnbalance(60N,
Iub>)/SCUCPTOC(60N, Iub>):x/outputs , where x = instance number.
3. To store the unbalance current values, perform these steps:
Step No.
3-a
3-b
3-c**
* - CT ratios of the phase currents (1000/1 A) and unbalance currents (10/1 A). The values of IB1 and IB2 are
considered as 1000 A and 10 A, respectively. The current inputs I
I
UNB_A
** - This step should be done only during Factory Acceptance Test (FAT). At field, the testing should be done with
the stored field values.
4. Check the respective operation of warning, alarm, and trip.
Step No.
4-a
4-b
Table continues on next page
Bay control REC670
Commissioning manual
IUnbalAlm> = 20% IB2
IUnbalWrn> = 10% IB2
IMin = 10% IB1
Changes after step 1
Inject constant currents* of I
1∠240° A, and I = 1∠120° A in secondary at
C
rated frequency.
Inject I = 0.2∠0° A, I
UNBA
I = 0.2∠0° A in secondary at rated
UNBC
frequency
Activate binary input TRIGCOMP for 1 s
, I , and I refers to the unbalance current inputs.
UNB_B UNBC
Changes after step 3
Retain constant currents* of I
I = 1∠240° A, and I = 1∠120° A in
B C
secondary at rated frequency.
Change** I = 0.35∠0° A, I
UNBA
0.35∠0° A, and I = 0.35∠0° A
UNBC
Change I = 0.45∠0° A, Change
UNBA
I = 0.45∠0° A, and Change I
UNBB
0.45∠0° A,
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Expected output
= 1∠0° A, I = IA, IB, and IC should show 1000 A
A B
= 0.2∠0° A, and IUNBA and IUNBCLC_A should show 2 A
UNBB
IUNBB and IUNBCLC_B should show 2 A
IUNBC and IUNBCLC_C should show 2 A
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The following outputs should show the mentioned
values:
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, I
A
Expected output
WARNING TEST
= 1∠0° A, WARNING, WRNA, WRNB, and WRNC signals should
A
become HIGH after the set time delay
IUNBA, IUNBB, and IUNBC should show 3.5 A
IUNBCLCA, IUNBCLCB, and IUNBCLCC should show 1.5
=
UNBB
A which is equivalent to 15% of IBase2
ALARM TEST
ALARM, ALMA, ALMB, and ALMB signals should become
HIGH after the set time delay
=
UNBC
IUNBA, IUNBB, and IUNBC should show 4.5 A
IUNBCLCA, IUNBCLCB, and IUNBCLCC should show 2.5
A which is equivalent to 25% of IBase2
Testing functionality by secondary injection
The output COMPEXED should become
HIGH at 100 ms
The output LASTCOMP should display the
date and time of compensation
IMEM_A, IMEM_B, and IMEM_C should
show 1000 A
IMEMUNB_A, IMEMUNB_B, and
IMEMUNB_C should show 2 A
IREFUNB_A, IREFUNB_B, and IREFUNB_C
should show 2 A
IUNBCLC_A, IUNBCLC_B, and IUNBCLC_C
should show 0 A
, and I refer to the phase current inputs and
B C
Section 11
141