54
1MRS751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
Fig. 3.3.7.1.-1 Block diagram of the standard configuration H07
3.3.7.2. Application
The H07 standard configuration for REX 521 is designed for protection of large or
medium-size three-phase AC motors in circuit breaker controlled motor drives. Due
to large number of protective functions integrated, the relay provides a complete
protection against motor damage caused by electrical faults.
The H07 configuration can also be applied to other objects needing thermal overload
protection (such as power transformers) and it can also be used in applications
requiring overcurrent protection, under/overvoltage protection and/or directional or
non-directional earth fault protection.
For more information about the H07 standard configuration, refer to application
example on Section 11.7. Motor protection, High H07.
It is possible to record 16 digital signals in the disturbance recorder.
27, 47, 59
U1 <
U2 >
U1 >
49
3
60
F
3I <
37
I2>
46
46R
3I
3I
48, 14, 66
Is2t,n<
I
0
>
67N
3I >
50/ 51
f</f>
81U/ 81O
3U< 27
3U>
59
LO
86
CBF P
*/62
H07
50N/ 51N
I
0>
f
P
3U
3I
I
0
U
0
Q
E
pf
TCS
CBCM
MCS
3I ~har m
000
R
3U~har m
0
I
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