Siemens 8DJH Series Installation And Operating Instructions Manual page 15

Fig. 6: Front operating mechanism in transformer feeder
Mode of operation of
spring-operated/stored-
energy mechanism
500-8067.9 * INSTALLATION AND OPERATING INSTRUCTIONS 8DJH * Revision 03
The spring-operated/stored energy mechanism is used for three-position switch-
disconnectors in transformer panels (as transformer switch). First, the operating springs
are charged with the "spring charged" operation. Then, closing and opening is done via
separate pushbuttons. An energy store is available for the opening process when
an HV HRC fuse or a shunt release (f-release) trips. No additional charging process is
required for the energy store. This energy store is already charged by switching from
the "spring not charged" position to the "spring charged" position. This pre-charged
energy store ensures that the switch-disconnector/fuse combination can switch off all
types of faults reliably even during closing. After the HV HRC fuse has tripped, a red
transverse bar appears on the "fuse tripped" indicator.
The switchgear is equipped with an operating lever ejection system, which means that,
after charging the springs, the operating lever is ejected, thus preventing it from being
left inserted accidentally.
Description
a Ready-for-service indicator
s Knob-operated switch for
CLOSE/OPEN, motor operating
mechanism for DISCONNECTING
function (option)
d Knob-operated switch for
local-remote operation (option)
f
"ON" pushbutton
(mechanical operation)
g Auxiliary switch (option)
h Motor operating mechanism (option)
j Capacitive voltage detecting system
k
Manual operation of
the rotary lever mechanism for
the EARTHING function
l
Shunt release (f-release) (option)
;
"Fuse tripped" indicator
A Position indicator for
three-position switch-disconnector
S
"OFF" pushbutton
(mechanical operation)
D Actuating opening for
"spring charging"
F
"Spring charged" indicator for
closing and opening springs of
stored-energy mechanism
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