GE IC695CRU320 programmable automation controller

GE IC695CRU320 programmable automation controller

Technical data of product parameters

The “MemDuration” setting determines how long the last valid direction measurement shall be used. The setting should be as
short as possible (200 ms) when the IC695CRU320 function is being used as
backup for a distance function in an HV power system, because
an actually measured voltage is only available during this time
and therefore it is only possible to detect a reversal of direction
during this time. For longer settings, the last valid power direction is used instead of the actually memorised voltage.A tripping current is not set on an IDMT overcurrent function as it IC695CRU320
is on a definite time overcurrent function. Instead the position of
the characteristic is chosen such that it is above the load current.
The function, however, has a “base current” setting which is set
to the full load current IB1 of the protected unit. The base current
setting determines the position of the basic characteristic. The
characteristic is enabled when the base current is exceeded by a
preset amount (I-Start). The adjustment of the base current IB to
the load current IB1 of the protected unit instead of its rated current enables forAn alternative is to adjust the position of the IDMT characteristic
to match the rated load of the protected unit and set the base
current to its rated current instead of its load current.The multiplier ‘k1-Setting’ enables the IDMT characteristic chosen by the setting of parameter c to be shifted without changing
its shape. This is used for grading the operating times of a series
of IDMT relays along a line to achieve discrimination.
For example, in the case of the “very inverse” characteristic, the
constant c = 1 and the factor k1 13.5. The operating time t is IC695CRU320
given by the equationWhere directional functions are configured in both line terminals,
each can send a signal from its “MeasBwd” output to the “Receive” input of the function at the opposite end of the line (e.g.
via a PLC channel) when it is measuring a fault in the reverse direction. This signal prevents the respective directional overcurrent function from tripping, because the fault cannot be in the
zone between them. The functions therefore have to allow time,
i.e. the “wait time”, for the signal from the opposite line terminal
to be received. If none is received within “tWait”, the circuitbreakers are tripped at both ends.

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