Completing The Test; Phase Voltage Differential Based Capacitor Bank Unbalanced Protection, Scpdptov87V; Verifying The Signals And Settings - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
Step No.
4-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
I
UNB_A
** - Step 4 can also be done phase wise.
To calculate IREFUNB_A in
IREFUNB A
ANSIEQUATION19378 V1 EN-US
To calculate IUNBCLC_A in
IUNBCLC A IUNB A IREFUNB A
ANSIEQUATION19377 V1 EN-US
11.6.2.2

Completing the test

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.
11.6.3 Phase voltage differential based capacitor bank unbalanced
protection, SCPDPTOV87V
Prepare the IED for verification of settings outlined in Section
11.6.3.1

Verifying the signals and settings

Operation modes
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.
142
Changes after step 3
Change I = 0.55∠0° A, Change
UNBA
I = 0.55∠0° A, and Change I
UNBB
0.55∠0° A
, I , and I refers to the unbalance current inputs.
UNB_B UNB_C
Step 3-c, use the following equation:
IA
=
_
IMEM _ A
Step 4, use the following equation:
= -
_ _
The measured unbalance current is referred with respect to its reference current. Refer
Technical manual for more information about unbalance current calculation.
© 2017 - 2021 Hitachi Power Grids. All rights reserved
Expected output
START and TRIP TEST
• START, PU_A, PU_B, and PU_C signals should
become HIGH
=
UNBC
• 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
, I
A
´
IMEMUNB A _
_
"Preparing the IED to verify
1MRK 511 403-UUS Rev. K
, and I , refer to the phase current inputs and
B C
GUID-157C6A26-3126-4203-BEF9-4B816DD6EAA6 v1
GUID-6B483CCF-DC5C-4106-AE7B-D801893E9475 v1
GUID-EB2024D9-129E-4F95-9280-E62F40123422 v1
GUID-F31C0DAF-FD59-4EC1-92CF-56CC805640C5 v1
Bay control REC670
Commissioning manual
(Equation 29)
(Equation 30)
settings".