EMERSON SLS1508 KJ2201X1BA1 12P3162X212 module

EMERSON SLS1508 KJ2201X1BA1 12P3162X212 module

Technical data of product parameters

The use of a “Voltage” protection function in combination with an SLS1508 KJ2201X1BA1 12P3162X212
ancillary unit Type YWX111-11 or YWX111-21 enables earth
faults on the rotor windings of synchronous alternators and motors to be detected.The auxiliary supply of 100 V AC or 220 V AC can be obtained
from a voltage divider within the plant of from one of the generator v.t’s. In the case of the compact version of the RE. 216, the SLS1508 KJ2201X1BA1 12P3162X212
auxiliary a.c. supply can be taken from the input terminals of the
input transformer unit used for measuring the generator voltage.
Since double ground connections can cause problems, it may be
necessary to disconnect the YWX111-11/-21 ground connection
at terminal 3 within the cubicleThe protection scheme is coupled via capacitors (d.c. isolation)
to the positive and negative poles of the excitation circuit and to
the shaft ground. The YWX111-11/-21 ancillary unit, the coupling capacitors and the normal ground (shaft) capacitance of
the rotor winding form a balanced bridge in normal operation. An
earth fault represents a leakage resistance across the capacitance of the rotor winding to ground (shaft) and disturbs the balance of the bridge. The voltage difference occurring across the SLS1508 KJ2201X1BA1 12P3162X212
bridge is applied to an I/P v.t. of the RE. 216 and causes the
corresponding voltage function to trip.In principle any value can be set within the setting ranges for thepick-up value Rf and the time delay t.
The setting of the voltage function should no be too sensitive to
avoid mal-operation of RE. 216 during fast regulation of load
changes. This is especially important where the protection trips
the field switch and shuts the unit down.The ancillary unit Type YWX111-11/-21 must be installed as
closely as possible to the RE. 216 equipment (same panel or
cubicle) to minimise the risk of interference.
On the other hand, the coupling capacitors CK should not be installed in the protection equipment room, but as closely as possible to the protected unit. The cables to the rotor winding must
be suitable for the insulation level of the rotor circuit as determined by the excitation voltage.

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