- 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
The TLC 4 non-contact overhear wire contact is an electronic further development of the existing power contact (usually just called an O contact). It can therefore be used in all cases in which power contacts had been used up until now, i.e., for all tasks in which the power pickup is required to trigger a signal or other switching process. Since it is easy to install directly on the contact wire, this form of contact pickup is also suitable stationary units, especially also for construction site units that are set up for a short time only and in which the contact point varies temporarily, or the like.
This electronic development of the former power contact offers all the advantages of modern electronics in addition. It is no longer necessary to have any contact with the switching part by the current pickup. This also does away with problems of oscillations in the entire contact wire network or jumping of the current pickup at the contact wire and shocks and impacts at the power contact. The high switching clearance reserve ensures that there is still trouble-free switching if the current pickup makes poor contact at the contact wire.
Additional safety requirements can also be met, which was not the case with the normal power contact, can be met in connection with the four-wire technology used and the corresponding electronic evaluation. In addition, the electronics allow counting down to the individual sliding contact bow due to their speed of response and regardless of the speed of the vehicle.
However, in practical terms the special advantage is that the entire supply network for the overhead lines is completely isolated galvanically from the contact wire mains network. The former problem of the need to carry an earth up to the contact wire or to the power contact thus cannot occur any longer. The switching behaviour is likewise not influenced by voltage fluctuations or other problems in the contact wire power supply.
The entire signalling system is made up of three components:
1. the fully encapsulated and galvanically.
The fully encapsulated non-contact sensor that is galvanically isolated from the contact wire, and which can be attached simply to the contact wire by means of contact wire terminals in accordance with DIN 43142/44.
2. The isolating stage that is galvanically isolated from the four wires leading to the overhead wire contact and the from the power supplies, i.e., the signalling power supply, so that the connections leading to the overhead wire contact are galvanically isolated from all other power supplies and have no earth connection.
This means: no trailing earthing cable to the contact wire. This also prevents over-voltages, electrical interference or other problems in the electrical power supply being brought into the signalling power supply.
3. The actual evaluation stage that is designed in accordance with the requirements and needs stated by the customer. Here it is possible to monitor the connecting cables to the sensor, the function of the sensor and trouble-free switching. In addition to the desired signal contacts, it is also possible to derive an error signal for cable breaks, function failures, etc. As a rule, the error signal (if nothing is desired to the contrary) is only deleted after clearing and acknowledging the error. The acknowledgement can also be done via the remote operation unit. The evaluation stage allows in addition a corresponding lengthening of the contacts so that the short switching pulses that occur on travelling past the carbon piece are passed on.
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