PLC module NW-BM85C002

PLC module NW-BM85C002

Technical data of product parameters

It is assumed that the E/ F NW-BM85C002 protection settings at both ends of the
protected line are the same. This applies especially to the basic
time, the blocking time, the transfer tripping scheme in use and
optionsIn the case of 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. NW-BM85C002
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.On the other hand, a directional comparison scheme using a
blocking signal is able to detect high-resistance E/F’s along the
whole length of the line, because the protection at the strong
infeed end is always able to trip although the current at the weak
infeed end does not reach the enabling level.In this scheme, each of the protection functions has to receive a
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.Providing this parameter is active, a permissive signal (echo)
is sent to the opposite end of the line, if the local circuitbreaker is open and a signal is received. Tripping is thus NW-BM85C002
possible at the infeed end.
The duration of the echo signal is limited to 150 msIf the directional E/F function at the weak infeed end of a line
cannot measure, because the reference voltage is too low or
the current does not reach the enabling level, a signal is
returned to the opposite end of the line if one is received.
This enables tripping to take place at the end with the
stronger infeed

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