Electricity + Control August 2017

Electricity

Control

AUGUST 2017

<<Author>>

Dipl.-Ing. Ralf

Hausmann is in Product

Marketing, Surge

Protection Trabtech at

Phoenix Contact.

tonyr@phoenixcontact.co.za www.phoenixcontact.com/webcode/0144

Lightning and surge

protection is essen-

tial in large water and

wastewater treatment

systems.

Many manufacturers

offer MCR surge protec-

tive devices.

This company has

launched the world’s

narrowest (3,5 mm

wide) surge protection

for MCR.

Take Note!

abbreviations

ELECTRICAL PROTECTION + SAFETY

Use also in explosion-protected areas

A lightning and surge protection concept is es-

sential because of the higher risk in potentially ex-

plosive structural systems, often with far-reaching

consequences for persons and the environment.

In general, observation of lightning protection

standard DIN EN 62305 [1], applicable for nearly

all structural systems, is sufficient. Part 2 of the

standard describes risk management for structural

systems, which takes into account the effects of

lightning strikes. The standard relates to all struc-

tural systems − even systems with explosion risk

in accordance with DIN EN 60079-0 [2]. The ‘in-

trinsic safety Ex-I’ type of protection is useful as

a secondary protection measure in this environ-

ment. This type of protection limits voltages and

currents so that a potentially explosive mixture of

ignition energy and temperature is not reached.

DIN EN 60079-11 [3] is the specific standard for

these intrinsically safe circuits − here too, refer-

ence is made to the necessity of lightning and

surge protection.

For all systems that require high availability, a

failure lasting for even a short time is unaccept-

able. That is why the requirements for surge pro-

tection are also more stringent for such systems.

The surge protection of the Termitrab complete

TTC-Ex product range was designed for such

systems. The Ex-i certification of the TTC-Ex com-

ponents permits the use in field distributors for

Ex-zones 1 or 2. Additional approvals attest to the

suitability in accordance with Fisco (fieldbus intrin-

sically safe concept).

Conclusion

In water and wastewater treatment, there is an in-

creased failure risk in large systems due to surge

voltages, often with far-reaching consequences for

persons and the environment. A comprehensive

and well-planned lightning and surge protection

concept is therefore crucial. Using surge protec-

tion with telecommunicating status indication en-

sures quick detection in the control room. Due to

the compact design − with only 3,5 mm width for

the narrowest components − the space needed

for MCR surge protection can be reduced signifi-

cantly. Used in explosion-protected areas it is trou-

ble-free with the available approvals. Thanks to the

comprehensive product range, there is a suitable

solution for every application in water and waste-

water technology.

References

[1] DIN EN 62305-2. 2013. Protection against

lightning − Part 2: Risk management.

[2] DIN EN 60079-0. 2013. Explosive atmospheres

− Part 0: Equipment − General Requirements.

[3] DIN EN 60079-11. 2012. Explosive atmos-

pheres − Part 11: Equipment protection by in-

trinsic safety ‘I’.

[4] DIN EN 61643-21. 2013. Surge protective de-

vices for low voltage − Part 21: Surge protec-

tive devices connected to telecommunications

and signaling networks − Performance require-

ments and testing method.

MCR

– Measurement, Control

and Regulation

EMC

– ElectroMagnetic

Compatibility

–

Information Technology

PLC

– Programmable Logic

Controller

SMS

– Short Message Service

SPD

– Surge Protective

Device