Mains pro 1.6.1 Global Guide
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9.2.1 External trip
In case that a specific protective function is requested and this function is not supported in MainsPro, it may
be provided in an external device. Wire the output of this device to Ext Trip (page 61) to allow tripping by
this external device.
Use the External trip also for forced disconnection of the generator if such command is for example
evaluated in a superior system or transmitted through remote communication device.
External trip functionality may be also used for intertripping method of protection system topology. This
method is required by the mains operator for bigger generators.
9.2.2 Fault reset
Use this switch in case that complex conditions are to be evaluated before the generator is connected back
to mains. These conditions may be processed in an external system and the result may be sent to this
switch.
External fault reset may be also provided in case that locked button is used for performing the Fault reset
(page 32) operation by authorized personnel only. In this case, MainsPro is to be secured inside of the
locked switchboard and external fault reset only made possible.
Remote fault reset via GSM communicator may also be a useful feature for the remote sites.
9.2.3 Alternative settings
Alt Settings (page 61) binary switch may be used in case that a specific setting of the protection relay is
required by the mains operator when exceptional conditions occur. After deactivation, the unit immediately
switches to the default groups of setpoints.
9.2.4 Disable
The Disable (page 61) switch may be used for blocking the MainsPro protective functions, e.g. in case that
the generator is not running in parallel operation with mains, or any other blocking conditions are fulfilled.
9.2.5 CB Feedback
The CB Feedback (page 61) switch is used to confirm that a circuit breaker opened on a command issued
by MainsPro. Any time some protective function is activated and a trip is issued, deactivation of this binary
input is expected. If the feedback does not confirm opening of the CB, additional back-up trip BakTrpPer
(page 67) and BakTrpImp (page 68) will be issued after adjustable time delay BakTrpDel.
9.3 Counters
Keeping a track of the most frequent trips may provide valuable information for the generator as well as
distribution network operator. Use the counters indication on the Measurement screens (page 24) for keeping
track of the most frequent failures detected in the point of your connection. For example, in case that the
MainsPro counters show significantly higher rate of a certain failure types (e.g. overvoltage or Vector shift), it
may be a good signal to perform a detailed evaluation of the voltage quality in the point of connection or start
discussions with the DNO to allow for wider limits of the protection setting to minimize down-times of the
generator.
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