YOKOGAWA AIP830 DCS spare part control processor module

YOKOGAWA AIP830 DCS spare part control processor module

Technical data of product parameters

The voltage measured by the protection can quickly decay to
almost zero for a close fault and AIP830 make determining direction unreliable. For this reason, the function includes a voltage memory
feature and for the first 200 milliseconds after the incidence of an
overcurrent, the voltage measured immediately before the fault
is used as reference to determine fault direction.
After this time, the last valid direction is used for an adjustable
period (see next paragraph).
“MemDirMode” provides facility for setting how the protection
must respond after this time or in the event that the circuitbreaker is closed onto a fault and no voltage could be memorised beforehand. The two possible settings are the protection
can trip or it can block.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 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.The instantaneous overcurrent function is a high-speed protection, which operates in a wide frequency range. It is intended AIP830
primarily for two applications.
A protection measuring peak value is necessary for protecting
units, for which the influence of DC component and harmonics
may not be neglected. This is especially the case where rectifiers with semiconductors are involved.
The measuring principle of the function is relatively insensitive to
frequency and operates in a range extending from 4 to 120 % of
rated frequency. It is therefore able to protect units with synchronous starting equipment during the starting sequence before
reaching system frequencyThe minimum frequency must be entered for every application,
because it determines the reset time. A low minimum frequency
means a long reset delay and, since a good protection is expected to have a quick response, the reset time should be as
short as possible, i.e. the minimum frequency setting should not
be lower than absolutely necessaryThe voltage controlled overcurrent function comprises a definite AIP830
time overcurrent unit, which latches when the undervoltage unit
responds.
The protection is intended for generators and generator/transformer units, for which a fault current can fall below the AIP830
pick-up of the overcurrent protection before it has opportunity to
trip.
Apart from the influence of a DC component, a decaying AC
component can only occur on a generator, the steady-state fault
current of which is very low, because of the large synchronous
reactance Xd typical of modern generators (see Fig. 3.5.7.1).
This function is largely insensitive to DC component and harmonics.

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