Mmxu Deadbands - GE D90 Plus Instruction Manual

IEC 61850 COMMUNICATIONS

MMXU deadbands

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RREC1 LN Prefix
Range: six character ASCII string
Default: empty
This setting specifies the prefix for the autoreclose logical node.
RSYN1 LN Prefix, RSYN2 LN Prefix
Range: six character ASCII string
Default: empty
These settings specify the prefixes for the synchrocheck logical nodes 1 and 2.
XCBR1 LN Prefix through XCBR2 LN Prefix
Range: six character ASCII string
Default: empty
These settings specify the prefixes for the circuit breaker 1 through 2 logical nodes.
XSWI1 LN Prefix through XSWI6 LN Prefix
Range: six character ASCII string
Default: empty
These settings specify the prefixes for the circuit disconnect switch 1 through 6 logical
nodes.
ZLIN1 LN Prefix to ZLIN 4 LN Prefix
Range: six character ASCII string
Default: empty
These settings specify the prefixes for the transmission line data logical nodes 1 through
4.
A deadband is a range in which no action occurs, expressed as a percentage.
The MMXU deadband settings represent the deadband values used to determine when the
update the MMXU "mag" and "cVal" values from the associated "instmag" and "instcVal"
values. The "mag" and "cVal" values are used for the IEC 61850 buffered and unbuffered
reports. These settings correspond to the associated "db" data items in the CF functional
constraint of the MMXU logical node, as per the IEC 61850 standard. According to IEC
61850-7-3, the db value "shall represent the percentage of difference between the
maximum and minimum in units of 0.00%." Thus, it is important to know the maximum
value for each MMXU measured quantity, since this represents the 100.00% value for the
deadband.
Select the Settings > Communications > IEC 61850 > MMXU Deadbands menu to open
the MMXU deadbands configuration window.
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: COMMUNICATIONS