Completing The Test; Current Unbalance Protection Of Scb, Scucptoc; Verifying The Signals And Settings - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
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2. Values of the logical signals and service values for SCCFPVOC (51 V) are available on the local
HMI under: Main menu/Tests/Function status/Unbalance protection/
CapBankCascadingFail(51V,2(I>/U<))/SCCFPVOC (51V, 2(I>/U<)):x, where x = instance number.
3. Set the constant input voltage as, VA = 63.5∠0° V, VB = 63.5∠240° V, and VC = 63.5∠120° V in
secondary at rated frequency.
4. Set the constant input current as, IA = 0∠0° A, IB = 0∠ 240° A, and IC = 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 PU_ST2 and BFI_3P.
11.6.1.3

Completing the test

Continue to test another function or end the test by changing the TESTMODE setting to Disable. Restore
connections and settings to their original values, if they were changed for testing purposes.
11.6.2

Current unbalance protection of SCB, SCUCPTOC

Prepare the IED for verification of settings outlined in
11.6.2.1

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.
138
VoltageInput = 3×ZeroSeq
I > = 125% IBase
VDepFact1 = (1-117)/I> = 0.064
The Base values, CT and VT ratios are as follows:
2.1. VBase 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 VA = 1.0∠0° V, VB= 0∠240° V, VC =
0∠120° V and constant currents of IA = 0.10∠0° A, IB = 0∠240° A,
IC = 0∠120° A in secondary at rated frequency.
Repeat
Inject constant voltages of VA = 57.73∠0° V, VB = 0∠240° V, VC =
0∠120° V and constant currents of IA = 1.10∠0° A, IB = 0∠240° A,
IC = 0∠120° A in secondary at rated frequency.
Repeat
Inject constant voltages of VA = 76.21∠0° V, VB = 0∠240° V, VC =
0∠120° V and constant currents of IA = 1.26∠0° A, IB = 0∠240° A,
IC = 0∠120° A in secondary at rated frequency.
Step 3, Step 4 and Step 5
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Step 3 and Step 4, to reset PU_ST1 and BFI_3P.
Step 3 and Step 4, to reset PU_ST1 and BFI_3P.
for Step 2 operation, by setting Operation2 (Step 2) Enable, new
Section 10.1.2.
1MRK 511 403-UUS Rev. K
Expected output
PU_ST1 and BFI_3P signal
should be TRUE
PU_ST1 and BFI_3P signal
should be TRUE
PU_ST1 and BFI_3P 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
Bay control REC670
Commissioning manual