GE UR6CH universal module

GE UR6CH universal module

Technical data of product parameters

The RE.216 is equipped with either overcurrent or underimpedance starters. The setting of the parameter “StartMode” determines which of the UR6CH two is in operation.
A starter must pick up at least twice before its signal is processed (for phase selection, starting timers, signalling etc.).
Should a starter pick up only sporadically, only the backwards
measuring system and ancillary functions such as displaying
measurements etc. are enabled.
Starting signals do not reset unless all the starters have reset.The variables at the I/P’s of the overcurrent starters are the UR6CH
phase currents IR, IS and IT and the residual current IE (3I0),
respectively the neutral voltage UE (3U0). Initially, a logic determines Imax, i.e. the highest of the three phase currents IR, IS and IT.
If the value of Imax exceeds the setting of the parameter “Istart”
(overcurrent starters), each of the phase currents Iph is checked
to determine whether it exceeds the setting of the parameter
“Imin” (current enable) and also 80 % of Imax. In the case of the
residual current, the corresponding values are the setting of the
parameter “3I0min” and 25 % of Imax.
In the case of the ground current IE, it is checked whether it
exceeds the setting of the parameter “3I0min” and also 25 % of
Imax. Depending on the setting of the parameter “Earth fault
detector” (I0, I0 AND U0, I0 OR U0), it is checked at the same
time whether the residual voltage has exceeded the setting of
the parameter “3U0min” (neutral voltage enable).
The logic signals R, S, T and E are accordingly changed from
logical “0” to logical “1” or remain at logical “0”. The kind of fault
and the phases involved are thus determined, information which UR6CH
is needed forThe starting signals R, S, T and E do not reset until measurement has taken place and the impedances of all six loops lie
outside the back-up impedance zone. (If only the overcurrent
starters are in operation, there is no underimpedance starting
characteristic and relay response is determined by the setting of
the overcurrent starter “Istart”.)

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