The REX 521 and RED 500 platforms differ in the description of functional modules
In the CD-ROM "Function Module Technical Notes", the REX521 and RED 500 platforms differ in several aspects of function module descriptions. First, some terms refer to other products than REX 521. Second,
Model: REX521BBHGLB01C
Feeder and motor protection relay REX 521
The REX 521 and RED 500 platforms differ in the description of functional modules
In the CD-ROM "Function Module Technical Notes", the REX521 and RED 500 platforms differ in several aspects of function module descriptions. First, some terms refer to other products than REX 521. Second, there are some features that are only present in REX 521:
· Event mask 1 is only used for SPA communications.
· Direct control of automatic recasting functions is prohibited.
· A limited number of inputs and outputs are used in the standard configuration of the REX 521.
Standard configuration H50 features
· Two overcurrent protection
· Two directional zero sequence current (grounding protection) · Two zero-sequence current (grounding) protection · Two overvoltage protection
· Two stages of low voltage protection · Two stages of zero sequence voltage protection · Inrush current and motor start monitoring · Two stages of frequency protection
· Composite voltage protection
· Three-phase current input loop monitoring · Three-phase voltage input loop monitoring · Current waveform distortion measurement · Voltage waveform distortion measurement · Three-phase current measurement · Neutral line current measurement · Three-phase voltage measurement Zero sequence voltage measurement · System frequency measurement
· Measurement of three-phase power and electrical energy · Calculation of cumulative electrical wear of circuit breakers.
· Three-phase voltage measurement · Zero-sequence voltage measurement · System frequency measurement
· Measurement of three-phase power and electrical energy · Calculation of cumulative electrical wear of circuit breakers · Fault recording module
· Trip loop monitoring
· Circuit breaker Failure Protection (CBFP) function for delayed trip output · Automatic reclosing 1... 5 times closing
· Circuit breaker control with indication · latching function
· Operation object indication
· Logical control position selector · User configurable I/0· Electrical interlocking
· User configurable alarm light
