ABB RELION REB500 Technical Manual page 170

Section 5
Bay protection functions
Options:
• SendMode: non-directional
A blocking signal is transmitted in this mode, if the current is higher than
time has expired and no fault is detected in the forwards direction (including situations
when a direction measurement is impossible, because 3U
IN>Dir IN>Dir
INx>
RVS
FWD
IEC19000467 V1 EN-US
Figure 63: Principle of a blocking scheme
where:
• I-dir: current enable for directional measurement (= 0.7 I-Setting)
• I-Setting: current enabling level
• MeasFwd: fault in forwards direction
• MeasBwd': fault in backwards direction
• t
Basic
• t
Wait
I
I
0
0
I-Setting
I-Setting
I-dir
I-dir
IEC19000468 V1 EN-US
Figure 64: Operation of a blocking scheme
where:
• <...>: optional function
• I
asymm
• I-dir: current enable for directional measurement (= 0.7 I-Setting)
164
tBasic tBasic
tBasic tBasic
Send
AND AND AND
Receive
tWait tWait
AND AND AND
Rel. 1
A1
: basic time
: waiting time
Tx: I-dir  MeasBwd  t
<+I-dir  MeasFwd  t
<S: I-dir 
D: I-Setting  MeasFwd  t
MeasFwd  t
>
Basic
TB: MeasBwd  tTransBl
Tx: I-dir  MeasBwd  t
<+I-dir  MeasFwd  t
TB: MeasBwd  tTransBl
U-Setting
V-Setting
Basic functions
Non-directional transmission
: asymmetrical currents under normal load conditions
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0
tBasic tBasic
tBasic tBasic
Send
AND AND AND
Receive
tWait tWait
AND AND AND
Rel. 2
A2
18000062-IEC19000467-1-en.vsdx
Basic
>
Basic
 R t
Basic Wait
Basic
>
Basic
U
0 U
0
18000063-IEC19000468-1-en.vsdx
1MRK 505 406-UEN B
I-dir , the basic
< V-Setting).
IN>Dir IN>Dir
INx>
RVS
FWD
I I
asymm
a sym m
Bay protection functions REB500
Technical manual