Synchronisation Interfacing Remote PT

You could try feeding the PT signals into signal converters and transmitting the data via communication or network cable or wireless radio transmitters perhaps.

The short answer is: With telemetry.

The transmission medium best suited for your remote DAQ requirement will depend on a lot more information, that you haven't provided. (yet..?)

Mediums you might want to consider:

• Foot/horse/motorvehicle Runner
• Carrier pigeon
• Smoke signal
• Semaphore
• Telephone/telegraph line.
• Radio; HF, VHF, UHF, microwave, Wifi, Cellular, Satellite, troposcatter
  
• Infrared
• Optical fibre
• Powerline carrier
• ....add your own here fellas

The way you choose to relay the data over that 1km will depend on:

• Terrain
• Level of Urbanisation
• Easements
• Existing infrastructure
• Legacy issues
  
• Acceptable data latency
• Desired reliability
• Required speed of implementation, ie how soon you need it
  
• Opex V Capex preferences
• Available human resources
  
• How much money you have to start with
• politics
• politics
• politics
• how much money you then have left
• and other considerations.
  

Let us know how you get on.

If I understand your question correctly,

1. Distance between power station and Switchgear room is 1 km.

2. Controls for synchronising and load sharing are located in Power Plant.

There are two ways I can suggest:

Alternative 1:

If the Outgoings are radial feeders (not connected to another power plant at remote end), then,

PT for each Generating unit shall be located in Power Plant close to the alternators in a measuring cubical. Additionally install LA between measuring cubical and outgoing power cables.

PT for bus can be in the switchgear and should lay 1 km long cable for PT signal to synchronising panel. Ensure that distance between this cable and any power cable is at least 1 meter. This is to avoid any induce emf due to power cables.

Alternative 2:

Other alternative is to install Generator Breaker near each Generating Set with two PTs one each at incomer and outgoing sides.

PT is still required at incomer of remote end breaker. This is to ensure that it is only closed when there is no supply on its incoming cable.

Inter-trip will be required between remote end and generator end CB such that if remote end CB trips, the power plant end also trips.

In this case you can avoid running PT signals from 1km remote switchgear to synchronising panel.

Inter-trip interlock can be via slave I/O device of PLC and Optic Fibre cable.

Details of safety interlock you can work out. I design and supply similar equipment and if required can contact me further.