6-28 Settings Date Code 20010518
SEL-2020 Instruction Manual
Table 6.11: SET A Automatic Message Settings Information (continued)
Setting Comment
ACK1A-3A
Prompt. Acknowledge string.
Description. You define the string to send to the connected device when the data received
from it passes the checksum verification. This string is limited to 10 characters.
NACK1A-3A
Prompt. Negative Acknowledge string.
Description. You define the string to send to the connected device when the data received
from it does not pass the checksum verification. This string is limited to 10 characters.
USER
Prompt. Size of user-defined data space in registers.
Description. You enter the number of registers you need to use for data storage in the
User region of memory. This may be automatically increased during SET M operations.
Automated Control
You can associate SEL
OGIC elements with specific SEL IED operations by enabling the
SEND_OPER setting. Changes in these elements can then cause the SEL-2020 to directly issue
operate commands to the attached SEL IED.
To find out what will be associated, use the AUTO n command to determine the number of
supported breakers and remote bits for operate control. For every breaker supported, one BRn
bit will be associated with an SEL IED breaker. For every remote bit supported, one RBn bit
will be associated with an SEL IED remote bit. Setting and clearing of BRn bits corresponds to
issuing OPEN and CLOSE commands, respectively. When SEND_OPER=Y, setting and
clearing of RBn bits corresponds to issuing remote bit set and clear commands, respectively.
When SEND_OPER=YP, setting RBn bits corresponds to issuing remote bit pulse commands
and clearing RBn bits has no direct effect.
If the attached SEL IED is an SEL-2020, the sixteen breakers correspond to the BR1 bits on each
port. Similarly, the sixteen remote bits correspond to the RB1 bits on each port. For example, if
you set BR5 in the local SEL-2020 on a port auto-configured with an SEL-2020 attached, the
command to set Port 5 BR1 will be issued to the attached SEL-2020.
The SEL-2020 can issue these commands in one of two ways: ASCII or binary. The AUTO
command will tell you which is supported. When ASCII commands are used, the SEL-2020 will
have to wait for any ASCII communications in process to complete before issuing the command.
If binary commands are used, the SEL-2020 will issue the command to the attached SEL IED
within 100 milliseconds.
The operate commands will be issued on the rising edge of the set and clear bits, unless they both
rise simultaneously. Consequently, the breaker and remote bits will track the value of the last
operation the SEL-2020 performed. The relay may operate breakers or have its remote bits
changed independent of the SEL-2020, so you cannot depend on the state of the breaker and
remote bits to indicate the state of the relay.
If you wish to block the operation of one of these bits, assign both the set and clear equations to a
blocking element. For instance, if you use X to block breaker one operations, you would set the
equations to:
SBR1 = X
CBR1 = X
To Next Page
Loading...
