Checks Of The Stored Energy Operator Mechanism; Maintenance And Lubrication; Fastener Check; Manual Spring Charging And Contact Erosion Checks - Siemens SDV-4A Instruction Manual

Maintenance
Figure 22. Side View SDV, Typical.

Checks of the Stored Energy Operator Mechanism

The stored energy operator checks are divided into me-
chanical and electrical checks for simplicity and better or-
ganization. The first series of checks determine if the basic
mechanism is clean, lubricated and operates smoothly with-
out control power. The contact erosion check of the vacuum
interrupter is also performed during these tasks.

Maintenance and Lubrication

Table 3: Maintenance and Lubrication Intervals
ANSI C37.06 Table 7 - Usual Service Conditions
Maintenance Based Upon Number of Breaker Closing
Operations
Breaker Type
SDV
1 Five year interval for SDV breakers manufactured January, 1992 or later.
One year interval for units manufactured earlier.
The interrupter operator mechanism is shown in Figure 23
with the access door open and the operator control panel
removed to show construction details. Both the tripping
spring and the two closing springs are shown. The mov-
able end of each closing spring is connected to a crank
arm. The movable end of the opening spring is connected
Number of
Years/Closing Operations
1
5 years /500 operations
to the jack shaft by a pull rod. The dashpot is connected to
the jack shaft operating shaft by a pushrod linkage.
Figure 23. Front View of Operator Mechanism.
Clean the entire stored energy operator mechanism with a
dry lint-free cloth.
Check all components for evidence of excessive wear. Place
special attention upon the closing spring cranks and the
various pushrods and linkages.
Lubricate all non-electrical moving or sliding surfaces with
a light coat of synthetic grease or oil. Lubricants composed
of diester oils and lithium thickeners will be compatible.
Shell (drawn cup) needle bearings: Use either Beacon
(Exxon) 325 (reference 18-658-676-422 and part number 15-
337-131-001), or Supermil (Amoco) A-72832 (reference 18-
658-676-423), or Anderol 732 aerosol synthetic fluid grease
(reference part number 15-172-816-058).
Pivots, sliding, and/or rolling surfaces and general lubrica-
tion: Use Anderol 732 aerosol synthetic fluid grease (refer-
ence part number 15-172-816-058).
Fastener Check - Inspect all fasteners for tightness. Lock-
nuts, retaining rings and X-washers are used. Replace any
fasteners that appear to have been frequently removed and
replaced. X-washers can not be reused and must be re-
placed any time they are removed

Manual Spring Charging And Contact Erosion Checks -

Perform the Manual Spring Charging Check contained in
the section describing the Installation Check and Initial Func-
tion Tests. The key steps of this procedure are repeated
here.
2100-98
23