Special Inspection - WEG VBWC Serie Instrucciones De Instalación

Check Item
Contact resistance
of main circuit
Temperature rising
Notes:
1. Apply specified grease after replacement. (specification: HITALUBE280G)
2. Measure the contact resistance of main circuit with no-load mechanical operating test after replacement. The measured values should
be compared with the measured values before replacement and they should be put on record.
3. If there are traces of arc when replacing contactors, the terminals should be replaced . In case that there aren't any traces, wipe clean
on terminal surface.

10.4 SPECIAL INSPECTION

Make a special inspection in case of situation as Table 8.4.
N Inspection item
o
1 When interrupting short-circuit(fault) current several times
2 In case of appearing a abnormal situation at service operation
Check list
Measure a contact resistance of
main circuit after drawing out
the VCB.
- It must be less than 120% of
final inspection report value
- The variation resistance
between phases must be less
than 25%
Check the temp. rising of
contacted and connection parts
*The max. available limit of
temp. rising
- Contacted part: 65K
- Connected part: 75K
(K: Temperature rise)
Table 10.3: Items of periodic inspection (1).
Table 10.4: Special inspection.
Method
1. Dismantle the
contactors
2. Clean the
The voltage drop
discoloration,
method (DC 100A)
corrosion or heated
- Measure with
parts of arc
inserting the same
3. Clean the contactor
size copper bar
surface after removing
(make a jig for
foreign substances
measuring if
4. Apply specified
necessary)
*Specification:
HITALUBE280G
Visual Carry out a close
Infrared camera inspection
Inspection method
Check wearing contacts of vacuum interrupter
Check defective parts
www.weg.net
Solução Frequency
Annually
grease
As occasion
demands
Vacuum Circuit Breaker | 23