GE DR60, Technical Manual

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DR60
75 DR60-TM-EN- 2A
but high on overheads.
UDP (User Datagram Protocol) is a simpler protocol that transmits messages
irrespective of the state of the receiving device. It does not care whether the frames
arrive at their destination or not, and it will not retransmit lost frames. UDP is unreliable
and disordered, but low on overheads.
The choice of protocol will come down to the specific requirements of the application.
UDP is usually used for streamed real-time data, where the loss of a few pieces of
information is not critical, but where real-time transmission is necessary (for example,
live television pictures). TCP is usually used where the integrity of the sent data must be
guaranteed (for example a file transfer).
1.6 Communication Mode
1.6.1 Spontaneous
Spontaneous UDP may be required for several reasons, e.g. for security purposes,
where a firewall has been set up to block incoming data.
With spontaneous UDP, the PMU will continually transmit the phasor data, interspersed
with configuration data. This is configured such that it transmits a batch of phasor data
followed by a few frames of configuration data continuously.
There configuration frames sent is the CFG-2.
The configuration or header frames will be sent every minute in addition to the regular
transmission of the phasor data.
Two types of spontaneous destination are available: unicast and multicast.
The sending device needs to know where to send the data. So, the user needs to define
the destination UDP port number and IP address (unicast or multicast) in the
Destination Address field.
1.6.2 Commanded
The Commanded mode supports two types of transmission protocols: UDP and TCP.
In this mode, the PMU can accept commands from outside, therefore the receiving
device can initiate and control the flow of communication. The commanded PMU will
only start transmitting synchrophasors after receiving and external command to do so.
The destination address is the same as the address sending the command.
1.7 Standards Compliance
The DR60 PMU Class M and P complies with the following standards:
IEEE C37.118-2005
IEEE C37.118.1-2011
IEEE C37.118.2-2011
IEEE C37.118.1a-2014