ABB DSMB-01C module card stock

ABB DSMB-01C module card stock

Technical data of product parameters

In the case of DSMB-01C a permissive directional comparison scheme, the
amount of fault resistance which can be detected reduces
towards the remote end of the line, because the enabling current
must be exceeded at both ends. Without additional precautions,
the use of a permissive scheme would be limited on lines with a
weak infeed at one end.
It was possible to eliminate this disadvantage by providing the
directional E/F protection with its own echo logic for weak
infeeds which can be switched in and out as required.In this scheme, each of the protection functions has to receive a DSMB-01C
signal from the opposite end of line in order to be able to trip. A
protection function sends a permissive signal when its current
exceeds the enabling level ‘I setting’, the basic time ‘t Basic’ has
expired and the fault detected is in the forwards direction.The setting of the current enabling ‘I dir’ must take account of DSMB-01C
the zero-sequence component in normal operation arising from
system asymmetries.
The pick-up setting for the voltage enabling signal ‘U-Setting’ is
determined by the level of asymmetries on the secondary side
(v.t. tolerances, asymmetrical burdens etc.).
The ability to read voltage and current values on the relay is a
useful aid for determining these settings.
For example, if the enabling current setting ‘I-Setting’ is too low,
the pick-up signal lights continuously (current circuit enabled).
Since an E/F causes asymmetrical voltages in the vicinity of the
fault, the current flowing via the system capacitances also has a
zero-sequence component. A capacitive current of this kind on a
long line lies within the setting range of the sensitive E/F protection function.The line marking the reversal of direction lies at +90° in relation
to the reference voltage.
In order to achieve symmetrical operation of the directional element in spite of this, the characteristic angle should equal that of
the source impedance.

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