ABB Relion 670 Series Commissioning Manual page 145

1MRK 511 403-UUS Rev. K
• 1 Unbalance Curr - Select this option using the parameter setting SCBConf, if one unbalance
current is connected to the function.
• 3 Unbalance Curr - Select this option using the parameter setting SCBConf, if three unbalance
currents are connected to the function.
Testing with 1 Unbalance Curr option
1. Set IBase1 as primary phase current and IBase2 as primary unbalance current using the setting
function GBASVAL.
2. Set the following parameters:
•
•
•
•
•
•
•
3. Activate the RESETCOMP input to ensure that the stored values are reset to zero.
4. 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.
5. To store the unbalance current values, perform these steps:
Step No.
5-a
5-b
5-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
UNBˍA
** - This step should be done only during Factory Acceptance Test (FAT). At field, the testing should be done with
the stored field values.
6. Check the respective operation of warning, alarm, and trip.
Bay control REC670
Commissioning manual
Ensure that mandatory three-phase currents and unbalance currents are connected to
the separate SMAI blocks and their outputs are connected to the I3P and I3UNB inputs
of the SCUCPTOC function.
Operation = ON
SCBConf = 1 unbalance curr
tDefTrip = 5.00 s; tDefAlm = 5.00 s; tDefWrn = 5.00 s
IUnbal> = 30% IB2
IUnbalAlm> = 20% IB2
IUnbalWrn> = 10% IB2
IMin = 10% IB1
Changes after step 3
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 in secondary at rated
UNBˍA
frequency
Activate binary input TRIGCOMP for 1 s
refer to the unbalance current inputs.
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Expected output
= 1∠0° A, I = since SCBConf = 1 unbalance curr
A B
IA should show 1000 A
IB and IC should show 0 A
IUNB_A and IUNBCLC_A should show 2 A
• The output COMPEXED should become
HIGH for 100 ms
• The output LASTCOMP should display the
date and time of compensation
The following outputs should show the mentioned
values:
• IMEMˍA = 1000 A
• IMEMUNBˍA = 2 A
• IREFUNBˍA = 2 A
• IUNBCLCˍA = 0 A
, I , and I
A B
Testing functionality by secondary injection
GUID-201EB341-DD91-4927-A8BB-4A873E1798DB v1
refer to the phase current inputs and
C
Section 11
139