YOKOGAWA CP451-10 controller

YOKOGAWA CP451-10 controller

Technical data of product parameters

How accurately Rfs CP451-10 is measured depends on the values entered
for REs and MTR. Therefore check the settings and correct them
if necessary by connecting resistors between 100 and 10 k
between the star-point and ground with the generator at a
standstill.
The protection function provides a convenient way of setting
these two parameters in the software by switching its mode using the input ‘AdjMTRInp’ or ‘AdjREsInp’. This is CP451-10the recommended procedure. In this mode, the settings of the parameters
‘MTR’ and ‘REs’ are calculated with the aid of simulated ground
fault resistances. The two parameters are displayed continuously
in the window for measured values.
Should the values of REs and MTR determined by the adjustment mode differ from their nominal values, the calculated values are the preferred values.The stator ground fault protection scheme sees the grounding resistor of the second star-point as a ground fault with the CP451-10
value ‘REs-2.Starpt’.
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 CP451-10
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 possibleWhen the input ‘AdjCoupCInp’ is enabled, 133.00 is displayed initially until the coupling capacitor has been computed. This can take a maximum of 10 s after which the value
measured for C is displayed.
During normal operation, the value entered for the coupling
capacitor C on the HMI is displayed.

Product picture display

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