![](/images/new-backgrounds/1049886/4988687x1.webp)
Maintenance
Figure 38: Primary disconnect in mated position
Circuit | Number of |
breaker type | years/closing |
| operations |
| (whichever |
| comes first) |
|
|
10 years/ | |
| 10,000 |
| operations |
|
|
Table 2: Maintenance and lubrication schedule
Inspection of primary disconnects
Figure 38: Primary disconnect in mated position shows the primary-disconnect contact-fingers engaged. When the contacts are mated with the switchgear primary-stud assembly, there is forceful contact distributed over a wide area. This maintains low-current flow per individual contact finger.
Inspect the contact fingers for any evidence of burning or pitting that would indicate weakness of the contact-finger springs.
Inspect the primary-disconnect arms for physical integrity and absence of mechanical damage.
Inspect the flexible connectors that connect the bottom movable-contacts of the vacuum interrupters to the lower primary-disconnect arms for tightness and absence of mechanical damage, burning or pitting.
Using a clean cloth saturated with isopropyl alcohol, clean old lubricant from primary disconnects, and apply a very thin layer of Siemens contact lubricant (reference 15-172-791-233).
Checks of the stored-energy operator mechanism
The
Maintenance and lubrication
Table 2 gives the recommended maintenance intervals for circuit breakers. These intervals assume the circuit breaker is operated under “usual service conditions” as discussed in ANSI/IEEE C37.20.2, section 8.1, and C37.04, section 4, together with C37.010, section 4. The maintenance and lubrication interval is the lesser of the number of closing operations or the time interval since last maintenance.
The
Both the tripping spring and the closing spring are shown. The movable end of the closing spring is connected to a crank arm. The movable end of the opening spring is connected to the jack shaft by a pull rod.
Clean the entire
Check all components for evidence of excessive wear.
Place special attention on the closing
Lubricate all
Lubricants composed of ester oils and lithium thickeners will generally be compatible.
For all lubrication (except electrical moving or sliding surfaces), use one of the following:
Klüber Isoflex Topas L32 (part 3AX11333H)
Klüber Isoflex Topas L32N (spray) (part
Source:
Klüber Isoflex Topas L32 or L32N: Klüber Lubrication North America L.P. www.klueber.com
44