6-16
Settings
Date Code 20010518
SEL-2020 Instruction Manual
Data Collection Periods
You can set the SEL-2020 Communications Processor to collect data from attached devices on an
exception basis, i.e., only when an event occurs, and you can set the SEL-2020 to collect data on
a regular, periodic basis. Each SEL-2020 port collects data independently, based on your
settings, and you can set each port to collect data in different ways using separate message
trigger conditions and data request messages. Likewise, each SEL-2020 port responds to requests
for data independently, based on your settings. In either case, the SEL-2020 will not issue or
respond to another request for data on the same port until the previous request has been satisfied.
If the data response has not been completed before the same message trigger condition occurs
again, the second trigger will be missed completely. The SEL-2020 will acknowledge this
missed trigger by setting a delay bit in the port register, which is reported in the SEL-2020 status
report.
Although both exception and periodic data collection can encounter this type of delay, you can
control the periodic collection period, and thereby minimize the possibility of collection delays
and missed triggers. You should consider first, if the attached device is capable of transferring
data in binary format, or only in ASCII character format, and second, the type of data you plan to
request, i.e., meter, target, demand, or another type.
Table 6.5 presents some general guidelines regarding minimum data collection periods you
should use to collect various types of data from SEL relays in binary or ASCII format. The
guidelines in this table assume the relay is using a baud rate of 2400 or above and is not busy
processing events or communicating on more than one port. As this table shows, there is a
dramatic difference between the minimum collection period for a relay that has
Fast Meter
(binary data transfer) capability, and one that can transfer data only in ASCII format.
Table 6.5: SEL-2020 Minimum Data Collection Period (in Seconds)
Command
Binary Data Format
(
Fast Meter
)
ASCII Data Format
(no
Fast Meter
)
20METER 1
10
20DEMAND 1
10
20TARGET 1
20
1
20STATUS N/A
10
20BREAKER N/A
10
20HISTORY N/A
20
2
20EVENT N/A
120
20EVENTS N/A
120
20EVENTL
3
N/A
300
Notes:
1
SEL-321 Relay requires one minute.
2
SEL -321 Relay requires 30 seconds. The SEL-BFR and SEL-2BFR Relays
require 40 seconds.
3
Only supported on SEL relays that support 16 sample/cycle event reports.
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