Vacuum Circuit-Breaker
Modules
Medium-Voltage
Equipment
Description
Catalog HG 11.51 · 1998
© Siemens AG 1998
NXACT Vacuum
Circuit-Breaker
Module
Description
Construction and mode of operation
Features
• Stored-energy mechanism via closing
and opening spring
• Charging of springs
manually or electrically
• Storage of switching
sequence
1
The operating mechanism is
generally of the stored-energy
type. The mechanism operates
the pole assemblies through
rods. The closing spring can be
charged either electrically or
manually. It latches in when
charging is complete. The
closing spring acts as the
stored-energy mechanism.
For closing, the closing spring
can be unlatched either
mechanically by means of the
local “CLOSE” pushbutton or
electrically by remote control.
The closing spring charges the
contact-pressure/opening
springs as the breaker closes.
The now discharged closing
spring will be charged again
automatically by the mechanism motor – if this exists.
The breaker is now capable of
performing the OPEN – CLOSE
– OPEN switching sequence
that is required for an unsuccessful auto-reclosing
operation.
All stored-energy mechanisms
perform the switching duties of
synchronizing and rapid load
transfer (U) as well as autoreclosing (K).
1
7
2
8
3
9
4
10
5
6
R-HG11-116eps
Stored-energy
mechanism
Operating mechanism unit with stored-energy mechanism and secondary
equipment
1 Operating mechanism for
7 Low-voltage plug connector
8 Auxiliary switches for
disconnector function
2
3
4
5
Motor and gearbox
switching function
9 Opening block
10 1st shunt release
Closing spring
Closing solenoid
Auxiliary switch for disconnector
function
6 Operating mechanism for feeder
earthing switch
Trip-free mechanism
Features
• To VDE 0670
• To IEC 60 056
Operating mechanism
motors
Features
• DC or AC motors
• Short-time duty
• Varistor circuitry
In the event of an opening
command being given after a
closing operation has been
initiated, the moving contacts
return to the open position and
remain there even if the closing command is sustained. This
means that the contacts of the
circuit-breaker module reach
the closed position under these
circumstances, as is permitted
by IEC 60 056 and VDE 0670.
The motors operate in shorttime duty. Therefore, the
voltage and power consumption need not agree with the
data on the rating plate.
Protection of operating
mechanism motors
(see adjacent table)
The inrush current in the
operating mechanism motor
can be neglected due to its
very short duration.
1/8Siemens HG 11.51 · 1998
Power consumption and rated normal currents for motor
short-circuit protection
Rated voltage
of operating
mechanism
Voltage
range
Power
consumption
of the
motor
Smallest possible
rated normal current
of the m.c.b. with
G-characteristic
max.
V
min.
V
W
VA
A
24
48
60
26
53
66
20
41
51
350
350
350
–
–
–
8
6
4
110
220
121
242
93
187
350
350
–
–
2
1.6
AC 100
110
230
121
121
244
93
93
187
–
–
–
400
400
400
2
2
1.6
V
DC
Bereich
Energieübertragung und -verteilung
Geschäftsgebiet Mittelspannung
Postfach 32 20
D-91050 Erlangen
http://www.ev.siemens.de
Siemens Aktiengesellschaft
Order No.: E50001-K1511-A511-A1-7600