MMS6120 axial vibration measurement module is available

MMS6120 axial vibration measurement module is available

Technical data of product parameters

Apart from the MMS6120 added security of redundancy, independent
communication channels enable different transfer tripping
schemes to be used for E/F and distance protections.
Providing the distance protection can detect a fault, it should trip
before the E/F protection picks up. For this reason, the basic
operating time ‘t basic’ for the E/F protection must be set longer
than the longest response time to be expected of the distance
protection.Where E/F and distance protections use the same communication channel, the transfer tripping schemes must be either both MMS6120
permissive or both blocking. In the case of permissive schemes,
in which the distance protection operates with non-directional
criteria at one end for a weak infeed, a supplementary logic must
be enabled by appropriately setting the parameter ‘Single chan.’.
This supplementary logic interlocks the distance relay’s receive
signal at the end of the E/F function’s basic time or when it picks
up in the backwards direction. To this end, the signal ‘RecveInh’
is connected to the distance protection input ‘ExtBlkHF’. Thus
the communication channel is initially available for use by the
distance protection and only made available to the E/F protection
at the end of the basic time. The basic time setting must allow
adequate time for the distance protection to detect and clear a
fault if it canThe E/F function can also be applied as a completely independent protection, but only in MV and HV systems.
The coordination of E/F and distance protections in this case is MMS6120
achieved by appropriately setting the parameter ‘t basic’ .
If this time is too short, there is a likelihood that the E/F protection will issue a three-phase trip before the circuit-breaker hasopened for faults that have been correctly detected by the distance protection. MMS6120
The basic time of the E/F protection must therefore be long
enough to ensure that the distance protection can trip phaseselectively.
No facility is provided for using the distance relay starters to
achieve phase-selective tripping by the directional E/F function.
An independent directional E/F function requires its own communication channel which must be entirely independent of thedistance protection.

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