K4LCN-16 51403519-160n03W31-s0082 card module Honeywell module
Technical data of product parameters
The operating characteristic of the U/f-Inv protection function
should be selected to be just below the short-time limit curve for
overfluxing. The time limits t-min and t-max must also be seK4LCN-16 51403519-160n03W31-s0082
It must also be noted that depending on the standard or specification, the units are also designed for a continuous level of
overfluxing apart from the short-time level. Typical values for
generators would be 100, 105, 107.5 and 110%. The choice of
characteristic must also take the continuous level of overfluxing
into consideration.Ground fault protection function for detecting ground faults close K4LCN-16 51403519-160n03W31-s0082
to the star-p oint of a generator. The scheme is based on the
principle of displacing the potential of the generator star-point by
injecting a coded low-frequency signal. The injection signal is
generated by the injection unit REX 010 and fed into the stator
circuit by the injection transformer block REX 011. This protection in conjunction with the voltage function ‘Voltage’, which covers 95 % of the winding, achieves detection of ground faults over
100 % of the winding. Compensation is provided for the influence of a second high-resistance grounded star-point in the
zone of protection.
Stator ground faults producing a current at the star-point > 5 A
cause the P8 contactor to reset which separates the injection
unit Type REX 010 from the injection transformer block REX 011
and interrupts injection in both stator and rotor circuits. In this
case the 95 % stator ground fault protection takes over the job of
clearing the fault on its ownHow accurately Rfs 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 st ar-point and ground with the generator at a
standstill.K4LCN-16 51403519-160n03W31-s0082
The protecti on 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 the 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
Product picture display
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