Redundant control processor PM861AK01 3BSE018157R1


External connections:
• Excitation current to the load cells
• 2 or 4 analog inputs for load cell signals
• 4 analog outputs, voltage or current
• 8 digital inputs for control signals
• 8 digital outputs
• +24 V supply for external units, max 0.5 A
• Ethernet connection
• Service and multiple control units
• 2 serial interfaces of type RS-232 for
external displays, control, etc.

Model: PM861AK01 3BSE018157R1

Category: SKU: PM861AK01 3BSE018157R1 Tag:
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Redundant control processor PM861AK01 3BSE018157R1

Redundant control processor PM861AK01 3BSE018157R1


Operation The operation of the Autorecloser for 1/2/3-phase operation (SMBRREC) function can be switched On and Off. The setting ExternalCtrl makes it possible to switch it On or Off using an external switch via IO or communication ports. NoOfShots, Number of reclosing shots In power transmission 1 shot is mostly used. In most cases one reclosing shot is sufficient as the majority of arcing faults will cease after the first reclosing shot.

In power systems with many other types of faults caused by other phenomena, for example wind, a greater number of reclose attempts (shots) can be motivated. First shot and reclosing program There are six different possibilities in the selection of reclosing programs.

The type of reclosing used for different kinds of faults depends on the power system configuration and the users practices and preferences. When the circuit-breakers only have threephase operation, then three-phase reclosing has to be chosen. This is usually the case in subtransmission and distribution lines.

Three-phase tripping and reclosing for all types of faults is also widely accepted in completely meshed power systems. In transmission systems with few parallel circuits, single-phase reclosing for singlephase faults is an attractive alternative for maintaining service and system stability.


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