Single Transformer - ABB rec670 Commissioning Manual

1MRK 511 360-UEN A
10.9.4.7
Bay control REC670 2.1 IEC
Commissioning manual
Testing functionality by secondary injection

Single transformer

Load drop compensation
1. Confirm that OperationLDC is set to On.
2. Confirm settings for Rline and Xline.
3. Calculate the expected load voltage U
local HMI) based on secondary injection of transformer secondary voltage (U
USet) and rated load current (I
EQUATION2080 V3 EN
where:
U , I = Re(I ) + jlm(I
L L L L
When all secondary phase-to-earth voltages are available, use the positive-
sequence components of voltage and current. By separation of real and
imaginary parts:
= -
ul re ub re rline il re , ,
EQUATION2082 V1 EN
= -
ul im ub im , , xline il re rline il im
EQUATION2084 V1 EN
where:
ub is the complex value of the busbar voltage
il is the complex value of the line current (secondary side)
rline is the value of the line resistance
xline is the value of the line reactance
For comparison with the set-point value, the modulus of U
equation 39.
2
¦ U ¦ = (ul , re) + (ul , im)
L
EQUATION2086 V2 EN
4. Inject voltage for U
5. Inject current equal to rated current I2Base.
6. Confirm on the local HMI that service values for bus voltage and load current are
equal to injected quantities.
(displayed as a measured value on the
L
= I1Base), in accordance with equation 36.
L
) are complex phase quantities
× + ×
, xline il im ,
× - ×
, ,
2
equal to setting USet.
B
Section 10
=
B
(Equation 36)
(Equation 37)
(Equation 38)
are according to
L
(Equation 39)
161