9.6
SEL-2032 Communications Processor Instruction Manual Date Code 20120126
Protocols
SEL Fast Message Protocol
Note that no IED can support the transmission of all messages at all data
speeds. If the selected data rate is not sufficient for the given message length,
the IED will respond with an error message (see Fast Message Synchrophasor
Settings).
Some observations from Table 9. 1 :
➤ A serial port set to 2400 baud or higher can handle any size
message at any supported data rate.
➤ A serial port set to 1200 baud can handle any size message at
any data rate, up to 30 messages a minute
➤ A serial port set to 300 baud can handle a single-synchrophasor
message at 30 messages a minute, a four-synchrophasor
message at 20 messages a minute, and any size message at 12
messages per minute or less.
➤ A rate of 60 messages per minute requires 600 baud for single-
synchrophasor messages, 1200 baud for four-synchrophasor
messages, or 2400 baud for any size message.
➤ A serial port set to any baud can handle any size message up to
12 messages a minute.
Because it is a member of the SEL family of interleaved protocols, the SEL
Fast Message Synchrophasor protocol is able to share the same physical port
with separate data streams (see SEL Protocol on page 1.7).
Fast Message Synchrophasor Settings
In the SEL Fast Message format, the SEL-2032 communications processor
must request a particular data message period, which it embeds in its
automatic enable message. If the requested message period is supported, the
SEL IED will acknowledge the request and begin transmitting
synchrophasors. If the requested message period is not permitted, the SEL
IED will respond with an
Invalid data error message and will not transmit any
synchrophasor data.
The synchrophasor automatic message setting SP_RATE allows the SEL-2032
to automatically Enable or Disable Unsolicited Data Transfer Messages to
attached SEL IEDs over serial connections. The Enable Message contains the
SP_RATE value instructing the attached SEL IED to begin sending
“Unsolicited Write” (UW) Messages (synchrophasor data) back to the
SEL-2032. See Automatic Message (SET A) Settings on page 7.11 for a short
description and valid settings for SP_RATE.
The SP_RATE setting will only be available if the attached device is an SEL
IED, as indicated by the port DEVICE setting. It is available whether the
attached SEL IED supports this functionality or not. If the SP_RATE is “N”,
the SEL-2032 will not enable or disable UW messages.
If SP_RATE is anything other than “N”, the SEL-2032 will attempt to enable
UW message transmission only if during autoconfiguration the IED indicates
support for transmitting UW messages in its Fast Message Configuration
response or the attached IED is one of the following:
➤ SEL-311A/B (R107 or higher)
➤ SEL-311C (R110 or higher)
➤ SEL-311L-1/-7 (R207 or higher)
➤ SEL-311L-0/-6 (R156 or higher)
Courtesy of NationalSwitchgear.com
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