Protection And Control Equipment; Voltage Detecting Systems; Ready-For-Service Indicator - Siemens 8DJH Installation And Operating Instructions Manual

3 | Description

3.10 Protection and control equipment

3.11 Voltage detecting systems

3.12 Ready-for-service indicator

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The protection equipment and control equipment is designed customer-specifically. The devices
are installed in the low-voltage compartment or in the low-voltage niche.
Details are given in the respective circuit documentation.
For voltage detection according to VDE 0682 Part 415 and IEC 61243-5 with the following
voltage detecting systems:
▪ Plug-in HR or LRM voltage indicator
▪ Integrated voltage indicators:
– VOIS
– CAPDIS
– WEGA
Fig. 16: Voltage detecting system via capacitive voltage divider (principle)
1 Integrated voltage indicator
2 Plug-in voltage indicator
-C1 Capacitance integrated into the bushing
-C2 Capacitance of the connecting cables and the voltage indicator to earth
U = U /√3 during rated operation in the three-phase system
LE N
U = U = Voltage at the interface (plug-in sockets) of the plug-in voltage indicator or the test
2 A
socket of the integrated voltage indicator
The switchgear vessels are filled with insulating gas and are under pressure. The ready-for-
service indicator at the operating front of the panel shows if the gas density in the gas-insulated
switchgear vessel is in order.
▪ Self-monitoring, easy to read
▪ Independent of temperature and external pressure variations
▪ Independent of the site altitude
▪ Only responds to changes in gas density
▪ Option: Signaling switch 1 changeover contact for remote electrical
8DJH • Installation and Operating Instructions • Version 11 • 500-8384.9
A A
indication