ABB Relion 670 series - Completing the Test; Phase Voltage Differential Based Capacitor Bank Unbalanced Protection, SCPDPTOV87 V; Verifying the Signals and Settings

Step No. Changes after step 3 Expected output
START and TRIP TEST
4-c Change I
UNBA
= 0.55∠0° A, Change
I
UNBB
= 0.55∠0° A, and Change I
UNBC
=
0.55∠0° A
• START, PU_A, PU_B, and PU_C signals should
become HIGH
• TRIP, TR_A, TR_B, and TR_C should become
HIGH after the set time delay, ifBlockTrip is set to
Trip enabled
IUNB_A, IUNB_B, and IUNB_C should show 5.5 A
IUNBCLC_A, IUNBCLC_B, and IUNBCLC_B should show
3.5 A which is equivalent to 35% of IBase2
* - 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
A
, I
B
, and I
C
, refer to the phase current inputs and
I
UNB_A
, I
UNB_B
, and I
UNB_C
refers to the unbalance current inputs.
** - Step 4 can also be done phase wise.
To calculate IREFUNB_A in Step 3-c, use the following equation:
_ _
_
IA
IREFUNB A IMEMU NB A
IME M A
= ´
ANSIEQUATION19378 V1 EN-US (Equation 109)
To calculate IUNBCLC_A in Step 4, use the following equation:
_ _ _
IUNBCLC A IUNB A IREFUNB A
= -
ANSIEQUATION19377 V1 EN-US (Equation 110)
The measured unbalance current is referred with respect to its reference current. Refer
Technical manual for more information about unbalance current calculation.
11.7.2.2 Completing the test
GUID-157C6A26-3126-4203-BEF9-4B816DD6EAA6 v1
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
11.7.3 Phase voltage differential based capacitor bank unbalanced
protection, SCPDPTOV87V
GUID-6B483CCF-DC5C-4106-AE7B-D801893E9475 v1
Prepare the IED for verification of settings outlined in Section "Preparing the IED to verify settings".
11.7.3.1 Verifying the signals and settings
GUID-EB2024D9-129E-4F95-9280-E62F40123422 v1
Operation modes
GUID-F31C0DAF-FD59-4EC1-92CF-56CC805640C5 v1
The SCPDPTOV function requires the inputs from both bus and tap voltage transformers to trip.
The SCPDPTOV function can be tripped in two different modes based on the physical connection and
configuration of the capacitor bank.
Section 11 1MRK 504 165-UUS Rev. J
Testing functionality by secondary injection
220 Transformer protection RET670
Commissioning manual
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