Signals - ABB RELION REX640 Technical Manual

1MRS759142 C
7.1.7
REX640
Technical Manual
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log
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Directional Coef
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GUID-D319D146-1DA3-4F5B-BB63-F805059EF77F V1 EN
I Rated operating current = 630 A
r
I Rated fault current = 16 kA
f
A Op number rated = 30000
B Op number fault = 20
Calculation for estimating the remaining life
Figure 694 shows that there are 30,000 possible operations at the rated operating
current of 630 A and 20 operations at the rated fault current 16 kA. Therefore, if the
tripping current is 10 kA, one operation at 10 kA is equivalent to 30,000/60=500
operations at the rated current. It is also assumed that prior to this tripping, the
remaining life of the circuit breaker is 15,000 operations. Therefore, after one
operation of 10 kA, the remaining life of the circuit breaker is 15,000-500=14,500 at
the rated operating current.
Remaining life reduction =
GUID-80720248-1453-420A-AD0F-6450ECBF316D V1 EN
Spring-charged indication
For normal operation of the circuit breaker, the circuit breaker spring should be
charged within a specified time. Therefore, detecting long spring-charging time
indicates that it is time for the circuit breaker maintenance. The last value of the
spring-charging time can be used as a service value.
Gas pressure supervision
The gas pressure supervision monitors the gas pressure inside the arc chamber. When
the pressure becomes too low compared to the required value, the circuit breaker
operations are locked. A binary input is available based on the pressure levels in the
function, and alarms are generated based on these inputs.

Signals

Table 1193: SSCBR Input signals
Name Type
I3P SIGNAL
BLOCK BOOLEAN
POSOPEN BOOLEAN
Table continues on next page
Condition monitoring functions
B
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A
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. 2 2609
= −
I
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f
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I
r 
Directional Coef
−
I
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I
r
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Default Description
- Three-phase currents
0=False Block input status
0=False Signal for open position of apparatus from I/O
Section 7
(Equation 284)
(Equation 285)
1267