EMERSON VE3008 KJ2005X1-MQ1 12P6381X022 module

EMERSON VE3008 KJ2005X1-MQ1 12P6381X022 module

Technical data of product parameters

The measurement has to be performed using the negative-sequence component, whenever there is no source of residual current behind the relay, i.e. no grounded transformer neutrals. The VE3008 KJ2005X1-MQ1 12P6381X022
parameter “VTSupMode” (operating mode) must be set accordingly.
The zero and/or negative-sequence components of currents and
voltages are compared with the settings of the parameters
and the associated binary signals U0, U2, I0 and I2 are then set
to logical “1” or left at logical “0”.
The signals U0 and U2 are delayed by 5 ms as a precaution
against incorrect blocking as a result of discrepancies between
the operating times of the three circuit-breaker poles.
Depending on the operating mode selected, one of the following
four conditions is monitoredBlocking by the v.t. supervision function is delayed for 12 s following manual closing of the circuit-breaker, an external
signal (m.c.b. via an opto-coupler I/P), a transfer tripping signal
from the opposite station or the generation of a local tripping
Should U0 (or U2) and I0 (or I2) pick-up during this delay, operation of the v.t. supervision function remains blocked until U0 (or
U2) resets. This measure prevents unwanted blocking during
single-phase auto-reclosure.
The signal generated by the v.t. supervision function ‘VTSupMode’ instantly blocks the distance protection function. Resetting the parameter ‘VTSupMode’ [VTSUP_BLKDEL] enables the VE3008 KJ2005X1-MQ1 12P6381X022
distance function to be blocked after delay of 12 s.
From 12 s after the v.t. supervision circuit has picked up, resetting of blocking is delayed by 1 s. Standard m.c.b’s can therefore
be used, providing their main contacts do not close before their
auxiliary contacts.The distance protection function includes a definite time overcurrent unit as back-up protection. A starting signal “Start O/C” is
set to logical “1”, when one or more of the currents IR, IS, and IT
exceed the setting of the parameter “I O/C”. Following the adjustable time delay “O/C delay”, the tripping signal “Trip O/C” is VE3008 KJ2005X1-MQ1 12P6381X022
set to logical “1” and applied to the system logic.
Blocking signals generated by the distance, underimpedance
starting, power swing blocking or v.t. supervision functions do
not influence the back-up overcurrent function.
The back-up overcurrent function is independent of the distance
protection starters and, since it does not have to perform any
phase selection, can therefore have a more sensitive setting

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