KJ3242X1-BK1 12P4711X052 industrial control module card PLC/DCS spare parts
Technical data of product parameters
When supplied from a 110 V battery, the maximum power injected into the stator circuit is 110 VA. The injection unit is KJ3242X1-BK1 12P4711X052
equipped with a converter to accommodate battery voltages
between 48 V and 250 V. The peak injection voltage is ±96 V.Giving due account to the available power, typical resistance
values for most applications are REs = 1000 and RPs = 150 .
Both RPs and REs must be able to conduct the maximum starpoint current for 10 s. The resistor RPs must also be continuously
rated for the injection voltage (injected power < 100 VA).
The maximum generator star-point current is determined by the
resistors REs and RPs. Using the above resistors, this current
would be, for example, 5.3 A for UGen = 10.5 kV or 13.5 A for
UGen = 27 kV.The two determination modes ‘REs-Adjust’ and ‘MTR-Adjust’
determine and display the values for REs and MTR, i.e. they
present the secondary circuit reflected on the primary system
side. Thus inaccuracies due to contact resistance, grounding
resistor tolerances etc., are compensated.
Determining the values for REs and MTR by means of the determination modes ‘REs-Adjust’ and ‘MTR-Adjust’ during commissioning is recommended in preference to calculating their KJ3242X1-BK1 12P4711X052
values.
As a check, calculate the values of R’Es and MTR’ from the values given for RE and MTR in the measured value window as
followsIn most cases, the calculated and determined values will not
agree. Discrepancies of ±20 % are acceptable. Where the discrepancies – especially in the case of REs – are larger, check or
measure the actual values of the grounding resistors and the
grounding transformerThe stator ground fault protection scheme sees the grounding resistor of the second star-point as a ground fault with the
value ‘REs-2.Starpt’. KJ3242X1-BK1 12P4711X052
Assuming a ground fault of resistance Rfs occurs, the total
resistance of the parallel resistors Rfs and ‘REs-2.Starpt’ is
calculated first. The value of Rfs can be simply determined
from this, providing the value of ‘REs-2.Starpt’ is known.
This procedure is subject, however, to certain restrictions.
The maximum ground fault resistance that can be detected is
approximately ten times the value of ‘REs-2.Starpt’.
Assuming the grounding resistor of the second star-point to
be 1 k, ground faults with a resistance less than 10 k can
be detected. For this reason, choosing a grounding resistor
‘Res-2.Starpt’ 2 k is recommended wherever possible.
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