ABB SF6 LTB 245E1 BLG 1002A - Page 84

Operating and Maintenance Instructions Inspection intervals
1HSB435409-100 en1 13
6.
Main current circuit
• Resistance check. 15 years or 5,000 mech CLOSE/
OPEN operations.
Circuit-breakers only operating
<100 CLOSE/OPEN
operations/year after 6-8 years or
2500 mech CLOSE/OPEN
operations.
Check resistance of circuit-breaker.
Resistance bridge, test current min.
200 A DC.
Resistance value as specified in
applicable Assembly instructions for the
circuit-breaker in question.
Higher values allowed for frequent
operation with small currents (≤400Α).
Calculation of permissible resistance:
7a.
Contact system
• Opening position 15 years or 5,000 mech. CLOSE/
OPEN operations.
’
Inspection of reference holes in outer
lever and mechanism housing.
See applicable Assembly instructions
for the circuit-breaker in question.
7b.
Operating
characteristics
• Opening time
• Closing time
• Close-Open time
• Phase discrepancy
• Auxiliary switches
• Contact travel
• Contact damping.
15 years or 5,000 mech. CLOSE/
OPEN operations.
Measurement with electronic timer.
Nominal operating voltage.
For times, see the applicable Assembly
instructions for the circuit-breaker.
Max phase discrepancy between
phases:
at closing 4 ms; at opening 3 ms.
max discrepancy between breaks in the
same phase:
at closing 3 ms; At opening 2 ms.
See Manual 1HSB515409-100 for BLG
1002A or 1HSB535409-100 for BLK
222.
To be inspected Inspection interval Measures / Instructions / Tools
R
Rn
2
-------
In
I
-----
1.65
=
R = Permissible increase in
resistance
R
n
= Max. resistance as specified
in operating values
I
n
= Rated current as specified on
rating plate
I = Current for which max.
resistance is calculated.