Description
12/121 Revision 05 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DJH • 500-8067.9
Spring-operated/stored-
energy mechanism
The spring-operated/stored energy mechanism is used for three-position switch-disconnectors
in transformer panels (as transformer switch).
With the operating lever, the closing spring and the opening spring of the operating
mechanism are charged at the same time. After that, the three-position switch-disconnector
can be first closed and then opened with separate pushbuttons.
When a HV HRC fuse or the shunt release (f-release) trips, the precharged opening spring is
available for the opening operation; no additional charging process is required. This ensures
that the switch-fuse combination can switch off all appearing faults reliably even when the
three-position switch-disconnector closes.
When a HV HRC fuse has tripped, the "fuse tripped" indicator shows a red transverse bar.
The three-position switch-disconnector can be switched to EARTHED position with the
operating lever.
In order to prevent the operating lever from being left inserted accidentally, the spring-
operated/stored-energy mechanism is equipped with an operating lever ejection system as
standard.
Fig. 7: Front operating mechanism box of transformer
panel
①
Ready-for-service indicator
②
ON/OFF momentary-contact rotary control switch for motor operating
mechanism, switch-disconnector (option)
③
Local-remote switch (option)
④
ON pushbutton for three-position switch-disconnector (mechanical
operation)
⑤
Auxiliary switch (option)
⑥
Control gate/locking device
⑦
Motor operating mechanism (option)
⑧
Sockets for capacitive voltage detecting system
⑨
Actuating opening for EARTHING the three-position switch-disconnector
⑩
"Fuse tripped" indicator
⑪
Position indicator for three-position switch-disconnector
⑫
OFF pushbutton for three-position switch-disconnector (mechanical
operation)
⑬
Shunt release (f-release, option)
⑭
Actuating opening for "spring charging" (switch-disconnector)
⑮
"Spring charged" indicator (switch-disconnector)
⑯
Retainer for short-circuit indicator / earth-fault indicator and voltage
detecting system
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