How to protect alivestock agricultural building

against the effects of lightning?

Your needsThis milk producing installation with fifty some heads includes a "stable", with astock of hay, a milk processing room fitted out with semi-automatic milkingmachines, a pasturisation and refrigeration unit for conservation of thebacteriological qualities and taste of milk.The aim of devices for the protection against lightning is to limit the risks linkedto fire and to protect equipment in order to guarantee product conformity withhealth and veterinary standards.This operation also includes a house that is fitted out with computermanagement equipment.

Environmentc This livestock farm:v is located in the mountains and has a high lightning density; moreover it issurrounded by very tall trees that attract lightning,v is supplied by a low voltage three-phase + neutral overhead line,v has a TN-S earthing system.c The local lightning density is high (Ng ≥ 1.6)c The equipment to be protected is expensive (≥ 500,000 Frs), and has:v a high impulse withstand voltage (Uchoc ≥ 4 kV) for devices of the motor,pump, compressor and lighting type,v a reduced impulse withstand votlage (Uchoc ≤ 1.5 kV) for computerequipment such as PC and printerc Protection of the power network against atmospheric voltage surges isensured using modular surge arresters of the PRD typec The telephone installation includes a telephone fax and a minitel in connectionwith the local co-op and thus requires protection against lightning of the PRCseries type.

pasteurisation unit

refrigeration

hay barn packing

cowshed

dining room

kitchentoilets

livingroom

bedroom 1 bedroom 2

emergency exitemergency exit

cowshed

stock

air-lock

milking room

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LightningProtectionSolutions

06/01M9FA13/A.en

Service offer Institut Schneider de FormationThe ISF is available to you for customer training inCergy-Pontoise, Grenoble, in your region or withinyour company:c "Basic Modules" product sessionsc "Surge arrester installation" sessionsc Technical seminar days: "Lightning Protection"

Schneider ServicesSchneider Electric offers professionals in the field ofelectricity and their customers, a whole range ofservices that accompagny all the product andsystem offers:c Preliminary lightning risk studies(as in the Order dated 28 January 1993)c MV and LV installation assessmentc Preventive and corrective maintenancec Technical and troubleshooting assistance

Partnerships To determine lightning strike density Ng (or keraunic level Nk) of your installation, contact the nationalmeteorology departments.

For information concerning the protection ofyour electrical installations against lighting,please contact your local Schneider agency:

Sales contact

As standards and equipment evolve from time to time, alwaysask for confirmation of the information given in this publication.Published by: MKT DABT, S2EDesign and layout by: HeadLines (38)

Merlin GerinF-38050 Grenoble cedex 9tel. +33 (0)4 76 57 60 60telex: merge 320 842 F

Schneider Electric This document was printedon ecological paper

Product fileRef.: M9DT07 orRef.: M9DT78 CD-Romwith HTML contents

Promotional documentRef.: M9DP29 PRD / PF / PE (NF)Ref.: M9DP41 PRD / PF / PE (IEC)Ref.: M9DP42 PRD / ST (IEC)

Calculation chartRef.: M9DP39 PRD / PF / PE (NF)Ref.: M9DP40 PRD / PF / PE (IEC)

Choice softwareRef.: M9AO52 PRD / PF / PE (NF)Ref.: M9AO53 PRD / PF / PE (IEC)Ref.: M9AO54 PRD / ST (IEC)

multimedia - Pre-AORef.: M9AO55 PRD / PF / PE (IEC)Ref.: M9AO56 PRD / ST (IEC)

Internationalc IEC 61024-1-1 (1993) and guide 1-2 (May 1998):protection of structures against lightning.c IEC 60364-4-443 and 5-534(03/1999 and 11/1997): electrical installation ofbuildings.c IEC 61312-1 (1995): protection againstelectromagnetic lightning surges.

Surge arrestercommunicationtools

LV Modular Surge Arresterstechnical guideRef.: M9GT02 PRD / PF / PE (IEC)Ref.: M9GT03 PRD / ST (IEC)

Technical collectionLightning and the protection ofinstallationsRef.: MD1 FBR1F

Cahier technique no. CT 179"Voltage surges and surge arrestersin LV, co-ordination of isolation in LV"

Poster and press releaseSee Product file Cat. no.: M9DT07

Installationstandards

Francec NF C 15 100 of April 1995, section 443 and 534:"The installation of surge arresters is recommendedfor overhead LV supplies".c Surge Arrester Installation Guide UTE C15-443 ofJuly 1996.

Conformes aux nouvelles normes CEI 61643-11

class 2 test et NFC 61-740/95, ils garantissent

une protection efficace et durable

des équipements électriques.

Les gammes PRD, PF, PE, PRC et PRI

vous offrent un large choix de protection selon

le niveau d’exposition du site aux surtensions

atmosphériques et selon le type de récepteurs

à protéger.

Parafoudres modulairesMerlin Gerin

Simples et efficacescontre la foudre,

ils font l’unanimité.

MERLIN GERIN

multi 9ID si

23315

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230Va

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MERLIN GERIN

multi 9C60NC25400Va

6000

24204

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10kA IEC 947.2

1 3

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PF65/PF65r PRD65/PRD65r

Secondary protection LVPF8 PRD8

MERLIN GERIN

multi 9PF8

15695

InImaxUp(LN/ )Up(L/N)Uc

2kA (8/20)8kA (8/20)

1,5kV1kV

250/440V

MERLIN GERIN

C65r-275Imax:65kA(8/20)In:20kA(8/20)Up:1,5kVUc:275V

multi 9PRD

if redreplace

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14 11 12

1655

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MERLIN GERIN

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MERLIN GERIN

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MERLIN GERIN

multi 9PF65r

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100kA (4/10)2kV

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MV/LV transformer

C6050 A

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C6020 A

PRD8 kA

C6020 A

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MSBagriculturalbuilding

house stable productionunit

Solutions Schneider and electricblock diagramc Since the operation entails several buildings, it isimportant to foresee the interconnection of theearthing systems in order to obtain goodequipotential bonding and to guarantee theeffeciency of surge arrester protection devicesc The main distribution cabinet (MSB) which isinstalled in the agricultural building's workshop hasan incoming surge arrester with an Imax = 65 kA.Other secondary surge arresters are installed insub-division enclosures in the home, stable and milkproduction units.

Role of surge arrester protectionc Run off the lightning current to the ground,guaranteeing a level of protection Up that iscompatible with the electric equipment to beprotectedc Limit the rise in the earth's voltage and theinduced magnetic field.

Wiring recommendationsc Make sure that frames and earths areequipotentially bonded in each building and thatthey are interconnectedc Reduce loop surfaces of supply cables.

Installation recommendationsc Install an incoming surge arrester with anImax = 65 kAc A disconnection circuit-breaker associated witheach surge arrester is to be foreseenc An RCCB of the "si" type should be foreseen fornuisance trippingc Install a surge arrester of the PRC series type onthe telephone line.

Communication networks protectionPRC series

16593

1 3 51 3 5

Imax :10kA (8/20)In :5kA (8/20)Up :300VUn :200V

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multi 9PRC

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ID "si" super-immunisedresidual currentcircuit-breaker

C60/C120disconnection circuit-breaker

heating

lighting

sockets

refrigerater

wahsingmachine

hot water

oven computerequipment

lighting

sockets

extra feeder

pasturisation

lighting refrigeration

milking

compressor

workshop socket lighting