ABB Relion 670 series - Page 224

Step No. Changes after step 5 Expected output
WARNING TEST
6-a Retain constant currents* of I
A
= 1∠0° A,
I
B
= 1∠240° A, and I
C
= 1∠120° A in
secondary at rated frequency.
Change I
UNBˍA
= 0.35∠0° A
WARNING and WRNˍA signals should become HIGH
after the set time delay
IUNBˍA = 3.5 A
IUNBCLCˍA = 1.5 A which is equivalent to 15% of IBase2
ALARM TEST
6-b Change I
UNBˍA
= 0.45∠0° A ALARM and ALMˍA signals should become HIGH after
the set time delay
IUNBˍA = 4.5 A
IUNBCLCˍA = 2.5 A which is equivalent to 25% of IBase2
START and TRIP TEST
6-c Change I
UNBˍA
= 0.55∠0° A • START and PUˍA signals should become HIGH
• TRIP and TRˍA signals should become HIGH
after the set time delay, if BlockTrip is set to Trip
enabled
IUNBˍA = 5.5 A
IUNBCLCˍA = 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
UNBˍA
refers to the unbalance current inputs.
To calculate IREFUNBˍA in Step 5-c, use the following equation:
_ _
_
IA
IREFUNB A IMEMU NB A
IME M A
= ´
ANSIEQUATION19378 V1 EN-US (Equation 107)
To calculate IUNBCLCˍA in Step 6, use the following equation:
_ _ _
IUNBCLC A IUNB A IREFUNB A
= -
ANSIEQUATION19377 V1 EN-US (Equation 108)
The measured unbalance current is referred with respect to its reference current. Refer
Technical manual for more information about unbalance current calculation.
Testing with 3 Unbalance Curr option
GUID-C028CACA-D487-4DD1-B7CA-92219F3A41F0 v1
1. Set the following parameters:
• Operation = ON
• SCBConf = 3 unbalance curr
• tDefTrip = 5.00 s; tDefAlm = 5.00 s; tDefWrn = 5.00 s
• IUnbal> = 30% IB2
Section 11 1MRK 504 165-UUS Rev. J
Testing functionality by secondary injection
218 Transformer protection RET670
Commissioning manual
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