3 | Description
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8DJH • Installation and Operating Instructions • Version 11 • 500-8384.9
3.3 Three-position switch-disconnector
▪ Three-position switch-disconnector for rated voltages from 7.2 kV to 24 kV
▪ Switching functions as switch-disconnector (class E3) according to IEC/EN 62271-103 /
VDE 0671-103, IEC/EN 62271-102 / VDE 0671-102 and IEC/EN 62271-105 / VDE 0671-105
▪ Designed with the functions of a switch-disconnector and a make-proof earthing switch
▪ Switch positions CLOSED, OPEN and EARTHED
▪ With the switch-fuse combination, the HV HRC fuse box can be earthed from both sides
(standard).
Spring-operated mechanism
The spring-operated mechanism is used for the three-position switch-disconnector in ring-main
panels (as ring-main switch).
The switching movements are performed independently of the operating speed.
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-link 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.
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. 4:
Front operating mechanism box of ring-main panel
Fig. 5:
Front operating mechanism box of transformer
panel
1
Ready-for-service indicator
10
"Fuse tripped" indicator
2
ON/OFF momentary-contact rotary control switch for
motor operating mechanism, switch-disconnector (op-
tion)
11
Position indicator
3
Local-remote switch (option)
12
Actuating opening for CLOSING/OPENING
4
ON pushbutton (mechanical operation)
13
OFF pushbutton (mechanical operation)
5
Auxiliary switch (option)
14
Shunt release (f-release, option)
6
Locking device
15
Actuating opening for "spring charging"
7
Motor operating mechanism (option)
16
"Spring charged" indicator
8
Sockets for capacitive voltage detecting system
17
Retainer for short-circuit indicator, earth-fault indicator
or voltage detecting system
9
Actuating opening for EARTHING
Summary of Contents for 8DJH
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