Page 7 - dehn-protects-the-railway-infrastructure

Protection of point heaters Selection guide: Protection of point heaters

Points ensure that the train keeps going in the right direc- makes it possible to plan, execute and monitor protective Application Type Part No.
tion. Electric point heaters are used to make sure that the measures. All aspects of external lightning protection,
points also function properly when there is snow and ice earthing and surge protection are considered holistically Protection of the power supply
so that railway traffic is not disrupted. At 10-20 kW, the and at a cost which is economically justifiable to ensure Mains 400/230 V, 50 Hz AC DEHNventil ® DV M TT 255 FM 951 315
heating output is comparable with that of a single-family that the relevant devices, facilities and systems are reliably Traction power 462 V, 16.7 Hz
Type 1+2+3
home. The stock rails, locking box, moveable frogs and protected.
point blades are all heated. A measuring sensor detects
all relevant environmental data like precipitation and tem- As a leading lightning and surge protection company, Protection of the heating circuit
perature. This information is collected and evaluated in a DEHN supports all those involved in the construction of Three-phase 400/230 V, 50 Hz AC DEHNguard ® DG M TT 275 FM 952 315
control cabinet. The point heating is only activated when point heaters. Reputable companies which build point Single-phase 230 V, 50 Hz AC DG M TT 2P 275 FM 952 115
the weather conditions require it. heater systems have long been placing their trust in Type 2
DEHN’s know-how and protection concepts.
The electricity supply comes either from the public mains Protection of data and information technology
or, preferably, from the traction power system (overhead Advantages of the DEHN protection solution: RS 232 BLITZDUCTOR ® XT BXT ML4 BD 12 920 342
contact line). When fed via the overhead contact line, the • Disturbance-free rail traffic thanks to high RS 485 BXT ML4 BD HF 5 920 371
I / O interfaces 24 V
BXT ML4 BE 24
920 324
corresponding high-voltage transformer cells also need to availability of point heater systems BXT ML4 BD 24 920 344
be fitted out: working according to the 5 safety rules re- • Lightning protection zone concept: lightning Base part for BLITZDUCTOR ® XT BXT BAS 920 300
quires, among other things, voltage detectors to check protection, earthing and surge protection all Ethernet / PoE DEHNpatch DPA M CLE RJ45B 48 929 121
that no voltage is present and EaS devices for earthing from one source DPA CLE IP66 929 221
and short-circuiting the system. • Safety equipment: voltage detectors and EaS
devices, incl. approval of the Deutsche Bahn Earthing
A well-functioning lightning protection zone concept to equip their high-voltage transformer cells, For earthing point heaters Earth rod StSt V4A TE 20 1500 AZ V4A 620 902
must be drawn up to prevent lightning, surges and electro- are available
magnetic interference from disabling the complex point • Worldwide service and support
heating system. The lightning protection zone concept

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