Electronic and digital interlockings

Avoid system failure and operative disruptions

Signalling and control systems are the brain and nervous system of railway transportation systems. Time and again lightning strikes lead to the failure of individual components in electronic interlockings causing train delays and cancellations.

You can provide effective protection for all kinds of interlockings by implementing a comprehensive lightning protection concept which is individually adjusted to the system at hand. Guideline 819.0808 "Blitz- und Überspannungsschutz von LST Anlagen" (Lightning and surge protection of control and signalling installations) issued by the Deutsche Bahn AG also makes recommendations on this theme.

The advantages for you of a DEHN protection solution for interlockings:

Economically viable material and installation costs thanks to the optimum planning of the protection concept
Prevention of costly operational disruptions and system breakdowns caused by lightning strikes and surges
Comprehensive protection concept - tailored to the specific conditions in your interlockings

Product portfolio for the protection of electronic and digital interlockings

To protect the power supply 400/230 V, 50 + 16.7 Hz:
DEHNventil® M TT 2P 255 FM
To protect signal mast boxes and point mechanisms:
DEHNguard® S275 VA FM
To protect data and information technology (signal lamps, data bus, ISDN/DSL/HDSL):
BLITZDUCTOR® XT
Condition monitoring of up to 10 BXTs - the visual indication signals defective or pre-damaged arresters:
DEHNrecord MCM XT
Components for earthing electronic and digital interlockings:
Earthing and equipotential bonding

1 - DEHNventil^® modular

Pre-wired type 1 + 2 combined, spark-gap based arrester to protect the power supply 400/230 V, 50 + 16.7 Hz.

2 - DEHNguard^® S275 VA FM

Universal surge arrester to protect signal mast boxes and point mechanisms.

3 - BLITZDUCTOR^® XT

To protect data and information technology (signal lamps, data bus, ISDN/DSL/HDSL).

4 - DEHNrecord MCM XT

Condition monitoring of up to 10 BXTs - the visual indication signals defective or pre-damaged arresters.

Protection of GSM-R transmitting and receiving systems

Optimum radio coverage thanks to maximum system availability

Most GSM-R (Global System for Mobile Communication - Railway) radio masts are in exposed locations in order to ensure a good transmission range. As a result, the risk of a direct lightning strike is particularly high. Professional lightning and surge protection is essential to maximise system availability and protect people in the vicinity.

The advantages for you of using a DEHN solution to protect GSM-R systems:

▪ Personal protection
• Maximum system availability
• Protection of devices and components
▪ Optimum support of all those involved in the process chain

Product portfolio for protecting GSM-R transmitting and receiving systems

To protect the power supply Remote Radio Head 48 V DC:
DEHNsecure M 2P 60 FM
To protect telecommunications lines:
BLITZDUCTOR® XT ML4 B 180
To protect the GSM-R 7/16 connector:
DEHNgate LG 7 16 MFA
To protect radio link PoE:
DEHNpatch CLE IP66
Components for earthing mast sites:
Earthing and equipotential bonding

1 - DEHNsecure M 2P 60 FM

To protect the power supply Remote Radio Head 48 V DC.

2 - BLITZDUCTOR^® XT ML4 B 180

To protect telecommunications lines.

3 - DEHNgate LG 7 16 MFA

To protect the GSM-R 7/16 connector.

4 - DEHNpatch CLE IP66

To protect radio link PoE.

Protection of level crossing safety systems

Operate level crossing safety systems so that they are safe and highly available

Level crossings are neuralgic points whose protection requires maximum reliability. Level crossings systems ensure that intersections where a railway line
crosses a road or path at the same level are safe. They must function reliably, even in a storm.

DEHN has developed a special protection concept in collaboration with manufacturers of level crossing safety systems and the DB Netz AG.

Your benefits from a DEHN solution for the protection of level crossing safety systems:

• Personal protection due to maximum safety
▪ Laboratory-tested protection solutions, approved by the Federal Railway Authority (Eisenbahn-Bundesamt)
▪ Maximum system availability due to optimum device and component protection
▪ Remote signalling of arresters to be replaced

Product portfolio for the protection of level crossing safety systems

To protect the power supply 400/230 V, 50 + 16.7 Hz:
DEHNventil M TT 2P 255 FM
To protect the DC voltage level supplied via charging rectifiers:
BLITZDUCTOR XT
Condition monitoring of up to 10 arresters (BLITZDUCTOR):
DEHNrecord MCM XT
Components for earthing level crossing safety systems:
SDS voltage limiting device and mast adapter

1 - DEHNventil M TT 2P 255 FM

To protect the power supply 400/230 V, 50 + 16.7 Hz.

2 - BLITZDUCTOR^® XT

To protect the DC voltage level supplied via charging rectifiers.

3 - DEHNrecord MCM XT

Condition monitoring system LifeCheck®: for up to 10 arresters (BLITZDUCTOR).

4 - SDS voltage limiting device and mast adapter

Components for earthing level crossing safety systems.

Protection of point heaters

Disturbance-free rail traffic - even in ice and snow

Electric point heaters are used to make sure that points also function properly when there is snow and ice.

Lightning strikes, surges and electromagnetic interference put the complex point heating system at risk. A special lightning protection concept forms the basis for comprehensive protection.

The benefits for you of a DEHN solution to protect point heaters:

All aspects of external lightning protection, earthing and surge protection are considered holistically and at a cost which is economically justifiable
Cost-intensive disturbances and downtime - as a result of lightning and surges - are reduced
The lightning protection zone concept is drawn up individually for your system and considers special conditions and requirements on site

Product portfolio for protection of point heaters

To protect the power supply 400/230 V, 50 + 16.7 Hz:
DEHNventil® M TT 2P 255 FM
To protect the heating circuits:
DEHNguard® M TT 2P 275 FM
To protect the data and information technology (RS 232, RS 485, I/O interfaces 24 V):
BLITZDUCTOR® XT
To protect the data and information technology (Ethernet / PoE):
DEHNpatch M CLE RJ45B 48
Components for earthing point heaters:
Earthing and equipotential bonding

1 - DEHNventil^® M TT 2P 255 FM

To protect the power supply 400/230 V, 50 + 16.7 Hz.

2 - DEHNguard^® M TT 2P 275 FM

To protect the heating circuits.

3 - BLITZDUCTOR^® XT

To protect the data and information technology (RS 232, RS 485, I/O interfaces 24 V).

4 - DEHNpatch M CLE RJ45B 48

To protect the data and information technology (Ethernet / PoE).

Protection of direct current railway systems

Safely on the way – even during storms

The constant growth of urban centres worldwide necessitates further expansion of local public transport. Direct current urban and underground railway systems are becoming more important and being extended.

In thunderstorms, platforms, stops and stations provide shelter for commuters and other travellers. Earthing shelters is particularly important. If a lightning flash finds its way to earth in this area, there may be increased step voltage with fatal consequences. Similarly, in the event of certain faults like, e.g., when an overhead contact line breaks, impermissibly high touch voltage may occur and put people at risk.

The benefits for you of a DEHN solution to protect direct current railway systems:

Special earthing components to protect against life-threatening step and touch voltage
Voltage-limiting device (VLD-F) SDS - to prevent the occurrence of dangerous overvoltages between the insulated tracks of electric railways and the earthed system parts
Personal protection is the top priority: Precise protection concepts which make platforms, shelters and stations a safe place for commuters and other travellers to be, even in thunderstorms

Product portfolio for protecting direct current railway systems

To protect the power supply 600 V DC – 3000 V DC DEHNventil M TT 255 FM:
DEHNtrack
To protect the mains power supply 400/230 V, 50 Hz AC and traction power 462 V, 16,7 Hz:
DEHNventil® M TT 255 FM
To protect I/O interfaces 24 V:
BLITZDUCTOR® XT
To protect against tough voltage:
Voltage limiting device SDS and mast adapter
To protect against step voltage:
Grid mat GMA 250 2000x1000x4 V4A

1 - DEHNtrack

To protect the power supply 600 V DC – 3000 V DC DEHNventil M TT 255 FM.

2 - DEHNventil^® M TT 255 FM

To protect the mains power supply 400/230 V, 50 Hz AC and traction power 462 V, 16,7 Hz.

3 - BLITZDUCTOR^® XT

To protect I/O interfaces 24 V.

4 - SDS voltage limiting device and mast adapter

To protect against tough voltage.

5 - Grid mat GMA 250 2000x1000x4 V4A

To protect against step voltage.

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Safety equipment and live working

DEHN’s safety equipment portfolio comprises safety devices and personal protective equipment for working according to the five safety rules in the area of electrified tracks and associated railway buildings.

Always the right soluton for your safety devices

on overhead contact wires
in substations
in indoor installations
for direct current railway systems
for DC or AC applications
for frequencies of 50 or 16.7 Hz

Whether voltage detectors, telescopic earthing sticks for the traction system earthing, or earthing and short-circuiting devices: all the products have been tried and tested and, for the most part, approved by the Deutsche Bahn with material and drawing numbers.

More about products and services in the area of safety equipment and live working: