Hitachi RET670 Commissioning Manual page 214

Section 11
Testing functionality by secondary injection
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
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.
4. Check the respective operation of warning, alarm, and trip.
Step No.
4-a
4-b
Table continues on next page
208
Changes after step 1
Inject constant currents* of I
L1
1∠240° A, and I = 1∠120° A in secondary at
L3
rated frequency.
Inject I = 0.2∠0° A, I
UNBL1 UNBL2
and I = 0.2∠0° A in secondary at rated
UNBL3
frequency
Activate binary input TRIGCOMP for 1 s
, I , and I refers to the unbalance current inputs.
UNBL1 UNBL2 UNBL3
Changes after step 3
Retain constant currents* of I
A, I = 1∠240° A, and I = 1∠120° A
L2 L3
in secondary at rated frequency.
Change** I = 0.35∠0° A,
UNBL1UNBA
I = 0.35∠0° A, and
UNBL2UNBB
I = 0.35∠0° A
UNBL3UNBC
Change I = 0.45∠0° A, Change
UNBL1
I = 0.45∠0° A, and Change I
UNBL2
= 0.45∠0° A,
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Expected output
= 1∠0° A, I = IL1, IL2, and IL3 should show 1000 A
L2
= 0.2∠0° A, IUNBL1 and IUNBCLCL1 should show 2 A
IUNBL2 andIUNBCLCL2 should show 2 A
IUNBL3 and IUNBCLCL3 should show 2 A
• The output COMPEXED should become
HIGH at 100 ms
• The output LASTCOMP should display the
date and time of compensation
The following outputs should show the mentioned
values:
• IMEML1, IMEML2, and IMEML3 should
show 1000 A
• IMEMUNBL1, IMEMUNBL2, and
IMEMUNBL3 should show 2 A
• IREFUNBL1, IREFUNBL2, and
IREFUNBL3 should show 2 A
• IUNBCLCL1, IUNBCLCL2, and
IUNBCLCL3 should show 0 A
, I
L1 L2
Expected output
WARNING TEST
= 1∠0° WARNING, WRNL1, WRNL2, and WRNL3 signals
L1
should become HIGH after the set time delay
IUNBL1, IUNBL2, and IUNBL3 should show 3.5 A
IUNBCLCL1, IUNBCLCL2, and IUNBCLCL3 should
show 1.5 A which is equivalent to 15% of IBase2
ALARM TEST
ALARM, ALML1, ALML2, and ALML3 signals should
become HIGH after the set time delay
UNBL3
IUNBL1, IUNBL2, and IUNBL3 should show 4.5 A
IUNBCLCL1, IUNBCLCL2, and IUNBCLCL3 should
show 2.5 A which is equivalent to 25% of IBase2
START and TRIP TEST
1MRK 504 165-UEN Rev. K
, and I refer to the phase current
L3
Transformer protection RET670
Commissioning manual