circulating current from the local HMI (I
cc_i
), calculate the value for
circulating current voltage adjustment U
ci
.
_
Udi Ci Icc i Xi
=
×
×
EQUATION2088 V1 EN-US
(Equation 14)
The voltage regulation algorithm then increases (for transformer
T2
) or
decreases (for transformer
T1
) the measured voltage by Udi and compares Ui
against the voltage deadband limits U1 and U2 for the purposes of voltage
regulation.
EQUATION2090 V3 EN-US
(Equation 15)
9.
To cause a tap change, the calculated value for circulating current voltage
adjustment must offset the injected quantity for bus voltage U
B
so that Ui is
outside the voltage deadband created by setting
UDeadband
. Expressed by
.
EQUATION2092 V2 EN-US
(Equation 16)
EQUATION2094 V2 EN-US
(Equation 17)
(for the purposes of this test procedure)
Therfore:
_
2
Ci Icc i Xi U
Uset
×
×
>
-
EQUATION2096 V1 EN-US
(Equation 18)
(
)
(
)
2
_
U
Uset
Icc i
Ci Xi
-
>
×
EQUATION2098 V1 EN-US
(Equation 19)
10. Using the settings for
USet
,
UDeadband
, C (Compensating factor) and
Xr2
(transformer short circuit impedance) calculate the magnitude of Icc
_i
necessary to cause a tap change command.
11. Inject current equal to
I2Base
for Transformer 1 and (
I2Base
- |Icc_
i
|) for
Transformer 2 so that the magnitude of calculated circulating current will
cause a raise command to be issued for Transformer 2 and a lower command
for Transformer 1. Magnitude and direction of circulating currents measured
for each transformer can be observed as service values on the local HMI and
Section 10
1MRK 506 377-UEN C
Testing functionality by secondary injection
150
Railway application RER670 2.2 IEC
Commissioning manual
Summary of Contents for RELION RER670
Page 1: ...RELION 670 SERIES Railway application RER670 Version 2 2 IEC Commissioning manual...
Page 2: ......
Page 26: ...20...
Page 54: ...48...
Page 58: ...52...
Page 62: ...56...
Page 80: ...74...
Page 188: ...182...
Page 194: ...188...
Page 204: ...198...
Page 214: ...208...
Page 215: ...209...