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REC 523
5.1.2.
5.1.3.
20
Remote Monitoring and Control Unit
Technical Reference Manual
Protection and fault indication functions
REC 523 provides a set of protection functions which also can be used for fault
indication.
Before taking a protection function block into use, ensure that the
function block operates correctly by checking the default values and
by properly setting the parameter values.
The protection function blocks (for example NOC3Low) supported by REC 523 are
independent of each other and have their own setting groups, data recording, and so
on. For example, the non-directional overcurrent protection includes two different
stages, NOC3Low and NOC3High, both with independent protection functions.
Either Rogowski coils or conventional current transformers can be used for
protection functions based on current measurement. Correspondingly, voltage
dividers or voltage transformers are used for protection functions based on voltage
measurement.
The protection function blocks are documented on the CD-ROM, Technical
Descriptions of Functions, refer to Section 1.8. Related documents.
Table 5.1.2-1
Protection and fault indication functions available for REC 523
Function
Description
Auto-reclose function (5 shots)
a
AR5Func
CUB3Low
Phase discontinuity protection
DEF2Low
Directional earth-fault protection, low-set stage
Directional earth-fault protection, high-set stage
b
DEF2High
DOC6Low
Three-phase directional overcurrent protection, low-set stage
Three-phase directional overcurrent protection, high-set stage
b
DOC6High
Three-phase transformer inrush and motor start-up current detector
b
Inrush3
NEF1Low
Non-directional earth-fault protection, low-set stage
Non-directional earth-fault protection, high-set stage
b
NEF1High
NOC3Low
Three-phase non-directional overcurrent protection, low-set stage
b
Three-phase non-directional overcurrent protection, high-set stage
NOC3High
Three-phase undervoltage protection, low-set stage
b
UV3Low
Three-phase undervoltage protection, high-set stage
b
UV3High
a. This function is only supported in the REC 523 software revision D, or later.
b. This function is only supported in the REC 523 software revision C, or later.
Control functions
The control functions are used to indicate the position of switching devices, that is,
circuit breakers and disconnectors, and to execute open and close commands for
controllable switching devices in the switchgear.
Furthermore, the control functions provide control objects for circuit breakers and
disconnectors, indication objects for switching device indications, on/off switching
objects for control logic purposes, miscellaneous objects for data monitoring, and so
on.
1MRS750881-MUM
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