Single Transformer - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
condition may cause an alarm or total block of the voltage control function to be displayed on the
local HMI.
3. Inject a current higher than the Iblock setting and confirm the alarm or blocking condition is present
on the local HMI. If an automatic or total blocking condition occurs, change the applied secondary
voltage and confirm that no tap change commands are issued from the associated binary outputs.
This situation can also be confirmed through reviewing the disturbance and service reports on the
local HMI.
11.10.5.7

Single transformer

Load drop compensation
1. Confirm that OperationLDC is set to Enabled.
2. Confirm settings for Rline and Xline.
3. Calculate the expected load voltage V
secondary injection of transformer secondary voltage (VB = VSet) and rated load current (I
I1Base), in accordance with equation 42.
V
L
EQUATION2081-ANSI V2 EN-US
where:
V
L
When all secondary phase-to-ground voltages are available, use the positive-sequence
components of voltage and current. By separation of real and imaginary parts:
vl re vb re rline il re xline il im ,
EQUATION2083-ANSI V1 EN-US
vl im vb im ,
EQUATION2085-ANSI V1 EN-US
where:
vb
il
rline
xline
For comparison with the set-point value, the modulus of U
¦ V
EQUATION2087-ANSI V2 EN-US
4. Inject voltage for V
5. Inject current equal to rated current I2Base.
182
= VB - (Rline + jXline) . I
, I = Re(I ) + jlm(I ) are complex phase quantities
L L L
= - × +
, ,
= - × -
, xline il re rline il im ,
is the complex value of the busbar voltage
is the complex value of the line current (secondary side)
is the value of the line resistance
is the value of the line reactance
2 2
¦ = (vl , re) + (vl , im)
L
equal to setting VSet.
B
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(displayed as a measured value on the local HMI) based on
L
L
×
,
×
,
1MRK 511 403-UUS Rev. K
are according to equation 45.
L
Bay control REC670
Commissioning manual
SEMOD175185-669 v2
SEMOD175185-672 v5
=
L
(Equation 42)
(Equation 43)
(Equation 44)
(Equation 45)