Table of Contents
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Section 11
Testing functionality by secondary injection
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
inputs and I
** - 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.
Step No.
6-a
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206
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
L3
rated frequency.
Inject I
= 0.2∠0° A in secondary at rated
UNBL1
frequency
Activate binary input TRIGCOMP for 1 s
refer to the unbalance current inputs.
UNBL1
Changes after step 5
Retain constant currents* of I
A, I
= 1∠240° A, and I
L2
secondary at rated frequency.
Change I
= 0.35∠0° A
UNBL1UNBˍA
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Expected output
= 1∠0° A, I
=
IL1 should show 1000 A
L1
L2
IL2 and IL3 should show 0 A
since SCBConf = 1 unbalance curr
IUNBL1 and IUNBCLCL1 should show 2 A
•
•
The following outputs should show the mentioned
values:
•
•
•
•
L1
Expected output
WARNING TEST
= 1∠0°
WARNING and WRNL1 signals should become HIGH
L1
after the set time delay
= 1∠120° A in
L3
IUNBL1 = 3.5 A
IUNBCLCL1 = 1.5 A which is equivalent to 15% of
IBase2
ALARM TEST
1MRK 504 165-UEN Rev. K
GUID-201EB341-DD91-4927-A8BB-4A873E1798DB v1
The output COMPEXED should become
HIGH for 100 ms
The output LASTCOMP should display the
date and time of compensation
IMEML1 = 1000 A
IMEMUNBL1 = 2 A
IREFUNBL1 = 2 A
IUNBCLCL1 = 0 A
, I
, and I
refer to the phase current
L2
L3
Transformer protection RET670
Commissioning manual
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