S&C Mark V Instruction Sheet

8 S&C Instruction Sheet 711-590
Inspection Recommendations
Table 1� Recommended Inspection Schedule for S&C Mark V Circuit-Switcher Components—Continued
Component
Mechanical-
Operations
Test
Value①,
Number of
Open/Close
Operations
Electrical-Operations Limit Inspection Frequency②
Application
Maximum
Current,
Amperes
Circuit-
Switcher
Style
Number of
Open/Close
Operations
Number of Open/Close Operations
Number
of Years
1 or 2 125 250 500 1 000 2 500 1 5
Pre-insertion
inductor
— — — — —
● ▼
Bypass
accessory
— — — — —
Not applicable
●
Grounding
switch
— — — — —
●
① Based on mechanical operations tests perform by S&C using a new
circuit-switcher with no intervening maintenance performed�
② Frequently operated circuit-switchers (typically 200 or more Open/
Close operations a year) should be inspected after the first 250 opera-
tions� Thereafter, they should be inspected at the frequency indicated�
Frequently operated circuit-switchers also require annual lubrication of
the disconnect live parts� See Table 2 on pages 4 and 5�
● Recommended inspection frequency�
■ Shunt-trip equipped 69-kV single-gap circuit-switchers in ungrounded
capacitor-switching applications must be inspected and the brains adjusted,
as necessary, every 1000 operations to prevent the occurrence of occa-
sional restrikes during opening operations� Non-shunt-trip equipped
69-kV single-gap circuit-switchers in ungrounded capacitor-switching
applications must be inspected and the brains adjusted, as necessary,
every 500 operations to prevent the occurrence of occasional restrikes
during opening operations� See S&C Instruction Sheet 711-515�
▲ Interrupters should be checked for low gas pressure (red targets)
during the user’s normal day-to-day operating procedures�
◆ For vertical-break style and integer style circuit-switchers manufactured
before 1983, the electrical operations limit of the disconnect live parts is
approximately one-half of the value indicated because the closing contacts
on these circuit-switchers apply lower contact pressure� Consequently,
the recommended inspection frequency for the disconnect live parts of
these circuit-switchers, in number of Open/Close operations, is one-half
of the value indicated� Present-design closing contacts are available for
field retrofit; refer to the nearest S&C Sales Office�
▼ Frequently operated circuit-switchers equipped with pre-insertion
inductors require annual cleaning of the inductor windings� See Table 2
on pages 9 and 10�

S&C Mark V Specifications

General

Brand	S&C
Model	Mark V
Category	Switch
Language	English