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1MRK 504 165-UEN Rev. K
3.
Set the constant input voltage as, UL1 = 63.5∠0° V, UL2 = 63.5∠240° V, and UL3 = 63.5∠120°
V in secondary at rated frequency.
4.
Set the constant input current as, IL1 = 0∠0° A, IL2 = 0∠ 240° A, and IL3 = 0∠120° A in
secondary at rated frequency.
5.
Following are the steps need to be followed to check the operation of Step 1:
Step
No.
5-a
5-b
5-c
6.
Repeat
values of input currents as per slope characteristics and the VDepFact2 based on the I>>
value; check the output ST2 and START.
11.7.1.3
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to their original values, if they were changed for testing purposes.
11.7.2
Current unbalance protection of SCB, SCUCPTOC
Prepare the IED for verification of settings outlined in
11.7.2.1
Verifying the signals and settings
Operation modes
A shunt capacitor current unbalance protection (SCUCPTOC) function can be operated in two
different modes based on the physical connection and configuration of the capacitor bank.
•
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.
Transformer protection RET670
Commissioning manual
The Base values, CT and VT ratios are as follows:
2.1. UBase considered is 400 kV
2.2. IBase considered is 3000 A and the calculations are done considering CT
ratio as 3000 A/1 A and VT ratio as 400 kV/110 V
2.3. Rated frequency = 50 Hz
Step1 operating characteristic verification
Inject constant voltages of UL1 = 1.0∠0° V, UL2 = 0∠240° V, UL3
= 0∠120° V and constant currents of IL1 = 0.10∠0° A, IL2 =
0∠240° A, IL3 = 0∠120° A in secondary at rated frequency.
Repeat
Inject constant voltages of UL1 = 57.73∠0° V, UL2 = 0∠240° V,
UL3 = 0∠120° V and constant currents of IL1 = 1.10∠0° A, IL2 =
0∠240° A, IL3 = 0∠120° A in secondary at rated frequency.
Repeat
Inject constant voltages of UL1 = 76.21∠0° V, UL2 = 0∠240° V,
UL3 = 0∠120° V and constant currents of IL1 = 1.26∠0° A, IL2 =
0∠240° A, IL3 = 0∠120° A in secondary at rated frequency.
Step
3,
Step 4
and
Step 5
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.
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Step 3
and
Step
4, to reset ST1 and START.
Step 3
and
Step
4, to reset ST1 and START.
for Step 2 operation, by setting Operation2 (Step 2) ON, new
Section
10.1.2.
Section 11
Testing functionality by secondary injection
Expected output
ST1 and START signal should
be TRUE
ST1 and START signal should
be TRUE
ST1 and START signal should
be TRUE
GUID-1F0146A2-2A0D-40D5-AC3C-2160810E9D06 v1
GUID-1CF5256E-43B5-4D24-9A71-AB043413D681 v1
GUID-CEB4E17E-DBDC-4201-BDC2-043E6F73BCD6 v1
GUID-8F767261-9D2D-49A7-87E0-CFEDF998FA66 v1
205
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