EQUATION2080 V3 EN-US
(Equation 115)
where:
U
L
, I
L
= Re(I
L
) + jlm(I
L
) are complex phase quantities
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 xline il im
=
-
×
+
×
EQUATION2082 V1 EN-US
(Equation 116)
,
,
,
,
ul im ub im xline il re rline il im
=
-
×
-
×
EQUATION2084 V1 EN-US
(Equation 117)
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
L
are according to
equation
.
¦ U
L
¦ = (ul , re)
2
+ (ul , im)
2
EQUATION2086 V2 EN-US
(Equation 118)
4.
Inject voltage for U
B
equal to setting
USet.
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.
7.
Confirm that the calculated value for load voltage, displayed on the local HMI, is equal to
that derived through hand calculations.
8.
When setting
OperationLDC set to On, the voltage regulation algorithm uses the
calculated value for load voltage as the regulating quantity to compare against
USet and
the voltage deadband limits
UDeadband and UDeadbandInner.
9.
While injecting rated current
I2Base into the IED, inject a quantity for U
B
that is slightly
higher then
USet + |(Rline+jXLine) · I
L
|. This will ensure that the regulating voltage U
L
is
higher than
USet, and hence no tap change command should be issued from the IED.
10. Reduce the injected voltage for U
B
slightly below
USet + |(Rline+jXLine) · I
L
| and confirm
that the calculated value for load voltage is below
USet and a tap change command is
issued from the IED.
12.10.3.8
Parallel voltage regulation
SEMOD175185-714 v2
Master follower voltage regulation
SEMOD175185-716 v6
Section 12
1MRK 502 067-UEN B
Testing functionality by secondary injection
216
Commissioning manual
