- Sensors
- Temperature monitor TW 50/60
- Temperature monitor TW 03 S – Type 8432
- Electronic temperature monitor – Type 8433
- PT100 thermo sensor – Type 8433
- Electronic thermostat – Type 8434
- PT100 thermosensor – Type 8434
- Electronic thermostat in cable form – Type 8434
- PT100 thermosensor 2-wire and 3-wire cable connection – Type 8434
- Non-contact magnetic switch – Type 8441
- Current sensor – Type 8442
- Non-contact overhead wire contact TLC 4 – Type 8474
- Precipitation sensor – Type 8921
- Precipitation sensor – Type 8921
- Potential monitoring/-protection
- Mobile adjustment and test device – Type 8204
- Potential monitoring devices
- Display unit – Type 8540
- Voltage Monitors
- Voltage Signal Relays
- Potential Protection Devices
- for floating grounds with voltage monitoring – Type 8900
- for floating grounds with voltage monitoring – Type 8900
- for floating grounds with current control – Type 8901
- with low voltage limiter, surge arrester current monitoring and remote clearing function – Type 8901
- with SIEMENS low voltage limiter and surge arrester – Type 8901
- for open earthing with current monitoring and remote clearing – Type 8901
- for floating grounds with current control and LED indicator – Type 8901
- Voltage fuse – Type 8961
- Voltage Limiting Device – Type 8962
- Over Voltage Protector Type PSNP – Type 8963
- R/C combination – Type 8970
- Earthing device – Type 8971
- Special relays
- Switching amplifier
- Temperature monitoring – Type 8435-PT100
- Evaluation unit – Type KAG2
- Evaluation unit – Type 8480
- Evaluation unit – Type KAV1
- Switching amplifier – Type 8582
- Switching amplifier – Type 8582DCW
- Isolating switching amplifier – Type 8583
- Switching amplifier – Type 8586
- Mobile Test Device for non-contact overhead contact line switch
- Cable Monitoring Devices
- Points Heating Systems
- Current Monitoring/-supply
- Cabinets
- Accessories
- Individual Solutions
Description
In order to comply with the maximum values for the voltage that are specified in VDE 0228, suitable measures are to be taken concerning the earthing of telecommunication cables, both below ground and above ground.
VÖV sheet 04.04.1 / Supplement, edition 01.84, Recommendations for Telecommunication Cables in DC Railway Operations, gives examples of how to apply the earthing principle. The earthing device for type 8971 telecommunication cables is to be set up in accordance with this earthing principle given in the correspondingly quoted VÖV recommendation.
The device has an 800 μF capacitor / DC 700 V and a discharge resistance of 22 kΩ to suppress DC currents via the cable shield.
The terminal strip is to be set up in accordance with VÖV sheet / Detail A with the option to separate or close the corresponding bridges for the measurement. The terminal strip has test sockets for 4 mm plugs.
With the exception of the recommended capacitance of 2700 μF in the above-mentioned VÖV sheet corresponds to the overall earthing device of the above-mentioned sheet. The reduction of earthing capacity was done with regard to economic considerations, since tests up to today have shown that enlarging the capacitor cannot be justified from an economic point of view.
Please refer to the corresponding VDE stipulations and VÖV recommendations concerning the overall planning of telecommunication cables.
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