Application - ABB RELION REX640 Technical Manual

1MRS759142 C
5.5.5
REX640
Technical Manual
Binary signal send
The status of the inputs is continuously sent in the line differential protection
telegrams. SEND_SIG_A can be used for alarming based on the status of
SEND_SIG_1...8. By selecting the signal mode as "In use, alarm sel.", the sending
status of the corresponding signal affects also the activation criteria of
SEND_SIG_A. Further, in case more than one signal channels are selected into the
alarm logic, the activation criteria can be defined according to "Any of selected" (OR)
or "All of selected" (AND).
Binary signal receive
The function receives continuous binary data within the protection telegrams from the
remote end protection relay. This received binary data status is then available as the
RECV_SIG_1...8 outputs on the local end protection relay. RECV_SIG_A can be
used for alarming based on the status of RECV_SIG_1...8. By selecting the signal
mode as "In use, alarm sel.", the received status of the corresponding signal affects the
activation criteria of RECV_SIG_A. Further, in case more than one signal channels
are selected into the alarm logic, the activation criteria can be defined according to
"Any of selected" (OR) or "All of selected" (AND). Each signal has also the Pulse time
1...8 setting that defines the minimum pulse length for RECV_SIG_1...8. Also, in
case the protection communication supervision detects a failure in the
communication, the RECV_SIG_1...8 outputs are not set to false sooner than the
minimum pulse length defined is first ensured for each signal.

Application

Among with the analog data, the binary data can also be exchanged with the line
differential protection relays. The usage of the binary data is application specific and
can vary in each separate case. The demands for the speed of the binary signals vary
depending on the usage of the data. When the binary data is used as blocking signals
for the line differential protection, the transfer response is extremely high. Binary
signal interchange can be used in applications such as:
• Remote position indications
• Inter-tripping of the circuit breakers on both line ends
• Blocking of the line differential protection during transformer inrush or current
circuit supervision failure
• Protection schemes; blocking or permissive
• Remote alarming
The figure shows the overall chain to transfer binary data in an example application.
The position indication of the local circuit breaker is connected to the protection
relay's input interface and is then available for the relay configuration. The circuit
breaker position indication is connected to the first input of BSTGAPC which is used
to send information to the remote end via communication. In the remote end, this
information is handled as a remote circuit breaker open position and it is available
from the first output of BSTGAPC. This way the information can be exchanged.
Protection related functions
Section 5
1089