7.6
SEL-734 Meter
Instruction Manual
Date Code 20090730
Time-Synchronized Measurements
Synchrophasor Measurements
Decide the Rate at Which You Want to Receive Fast Messages
The SEL-734 can transmit Unsolicited Fast Messages at the rate of 1, 2, 4, 5,
10, or 20 times per second. For Fnom = 50, the maximum rate is 10 times per
second. The packet sent to enable unsolicited synchrophasor data contains a
byte that defines the rate at which the SEL-734 will transmit synchrophasor
data. Use
to determine the correct value to insert in the enable
message.
Table 7.3
SEL Fast Message Protocol Format
Field
Description
Hex Data
Header
Synchrophasor Fast Message
A546
Frame Size
40 bytes for PMDATA = V1
a
a
When PMDATA=V1, size is 28h. When PMDATA=V, size is 40h. When PMDATA=A, size is 60h.
28
Routing
Must be 0000000000 for this application
0000000000
Status Byte
Must be 00 for this application
00
Function Code
20h Code for unsolicited write messages
20
Sequence
C0 for single frame message
C0
Maximum frame size
255 bytes
C0
Response Number
XX = 00, 01, 02, 03
00
PM Data Address
Address of Synchrophasor
Measurement Data (PMADDR setting)
00000000
Register Count
b
b
Register Count V1 = 0009h, V = 0016h, A = 0026h.
Data size in registers (1 Register = 2 Bytes)
XXXX
Sample Number
0-based index into SOC of this packet
XXXX
SOC
Second of century
XXXXXXXX
Frequency
IEEE 32-bit floating point
c
c
From ANSI/IEEE Std. 754–1985, The IEEE Standard for Binary Floating-Point Arithmetic.
XXXXXXXX
Phasor Mag.
V1 Magnitude (IEEE 32-bit floating point)
XXXXXXXX
Phasor Angle
V1 Angle
±
180° (IEEE 32-bit floating point)
XXXXXXXX
Digital Data
SV16–SV03
TSOK (Time Synchronization OK)
PMDOK (Phasor Measurement Data OK)
XXXX
Check Word
2-byte CRC-16 check code for message
XXXX
Table 7.4
Unsolicited Write Message Transmission Rates
Number of
Packets Per Second
Frequency of
Packets in Milliseconds
Data Transmission Rate
(nn–hexadecimal)
20
50
00h
20
50
05h
10
100
0Ah
5
200
16h
4
250
19h
2
500
32h
1
1000
64h
Содержание SEL-734
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