Planning of Lightning Protection Systems. DEHNsupport Toolbox Software.

Transcription

1 Planning of Lightning Protection Systems DEHNsupport Toolbox Software

2 2 Complicated calculations are history. Today it s easier...

3 ...with DEHNsupport Toolbox Software When planning lightning protection systems, various parameters must be taken into account, such as the building dimensions, electrical equipment, risk classes or financial aspects. The DEHNsupport Toolbox software makes this complex topic simple as never before since it performs all calculations. The DEHNsupport Toolbox software consists of the following four parts: DEHN Risk Tool page 4 Risk management including a procedure for assessing the risk is an integral part of the IEC lightning protection standard. DEHN Risk Tool makes risk management easier and ensures standard-compliant risk assessment in just a few steps. Update V3 The V3 update of the DEHNsupport Toolbox software includes a risk analysis according to edition 2 of the IEC standard and national adaptations. DEHN Distance Tool page 10 The separation distance defines the minimum distance of the lightning protection system from electrically conductive materials. If this separation distance is kept, dangerous sparking and uncontrolled flashover are prevented. DEHN Distance Tool allows to calculate the separation distance and to visualise the building as a 3D model. DEHN Air-Termination Tool page 12 DEHN Air-Termination Tool allows to calculate the length of air-termination rods depending on the class of LPS (Lightning Protection System). DEHN Earthing Tool page 13 DEHN Earthing Tool allows to calculate the length of earth electrodes as per IEC for every type of earth electrode and soil resistivity. Benefits of the DEHNsupport Toolbox software: user-friendly interface structured customer and project management detailed documentation of results based on the international IEC standard meets specific requirements of 13 national standards 13 different languages user support via and phone product training available good value for money 3

4 Step 1 Step 2 Update V3 Step 3 DEHN Risk Tool: Customer and project management Simple management of all customer data The DEHNsupport Toolbox software is based on a customer data and project management where all calculations are structured and permanently saved. These calculations can be retrieved and changed at a later date. Moreover, further customer or project data can be entered which are also included in the result report. Ground flash density data The ground flash density, which is selected in the customer and project management data, is an important value for performing a risk analysis according to IEC Country-specific adaptions The DEHNsupport Toolbox software includes ground flash density data and the associated maps for Austria Belgium Czech Republic Croatia France Germany Great Britain Hungary Italy Macedonia Poland Russia Slovakia 4

5 Human life Service to the public Cultural heritage Economic value Photo: Lightning Protection Paul Hahl, Frankfurt Risk analysis according to IEC Risk management and assessment of the building A risk analysis is performed to assess the potential risk for a building. Based on this analysis, measures can be taken to reduce the risk. The aim is to select economically sound protection measures which are perfectly adapted to the building s properties and type of use. A risk analysis does not only allow to determine the class of LPS, but also to develop a complete protection concept including the necessary LEMP protection measures. The aim of a risk analysis is to reduce the existing risk to a tolerable risk R T. Therefore, the tolerable risk R T is defined when selecting the risks. These tolerable risks are specified in the standard, however, responsible authorities having jurisdiction may define them in another way. Risks to be considered At the beginning of a risk analysis, the type of building use is required to determine the risks to be considered for the object requiring protection. When performing a risk analysis, four different risks are distinguished: Risk R 1 : Risk of loss of human life Risk R 2 : Risk of loss of services to the public Risk R 3 : Risk of loss of cultural heritage Risk R 4 : Risk of loss of economic value One or more risks can be relevant. The planner has to decide which risks to select. Risk R 1 : Risk of loss of human life Risk R 2 : Risk of loss of services to the public Risk R 3 : Risk of loss of cultural heritage Risk R 4 : Risk of loss of economic value LPS = Lightning Protection System LEMP = Lightning Electromagnetic Pulse 5

6 R Z R W Flashes... S 4... near a line R A... to a line... to a structure R V Risk R X R B S 3 S 1 R U... near a structure S 2 R C R M DEHN Risk Tool: Assessment and reduction of risks Risk composition When performing a risk analysis, not only the risks R 1 to R 4 are considered. Even more important is the composition of the total risk since each risk consists of individual risk components. Subdivision of the risk components according to the sources of damage The sources of damage form the basis for the subdivision of the risk components. The IEC standard describes different types of lightning effects as sources of damage. When performing a risk analysis, the following components are considered as sources of damage: Source of damage S 1 : Flashes to a structure R A = Step and touch voltage inside and outside a structure R B = Fire R C = Overvoltage / LEMP Source of damage S 2 : Flashes near a structure R M = Overvoltage / LEMP Source of damage S 3 : Flashes to a line R U = Touch voltage inside a structure R V = Fire R W = Overvoltage Source of damage S 4 : Flashes near a line R Z = Overvoltage LEMP = Lightning Electromagnetic Pulse 6

7 Environmental Urban environment: C e = 0.01 factor Urban environment (buildings < 20.0 m) : C e = 0.1 C e Suburban environment (e.g. in the outskirts): C e = 0.5 Rural environment (e.g. small village) : C e =1 Each risk component consists of different factors: R X = N X x P X x L X These factors are defined as follows: N X = P X = L X = Number of dangerous events per annum Probability of damage to a structure Consequent loss Frequency of dangerous events N X A variety of parameters are required to calculate the frequency of dangerous events N X, for example: Lightning ground flash density N G Collection area A D Location factor C D Environmental factor C E Probability of damage P X The probability P X describes the building and installation properties of a structure. These properties can reduce or increase the risk. Particularly the risk of fire, which defines the specific fire load of a structure, plays an important role when performing a risk analysis. Loss L X In addition to the frequency of dangerous events and the probabilities of damage, possible loss must also be calculated. Losses are differentiated according to the risks considered in the risk analysis and thus according to the risk components. The following losses can be determined: L 1 Loss of human life: Touch and step voltage Fire Overvoltage / LEMP L 2 Loss of services to the public: Fire Overvoltage / LEMP L 3 Loss of cultural heritage: Fire L 4 Loss of economic value: Touch and step voltage Fire Overvoltage / LEMP LEMP = Lightning Electromagnetic Pulse 7

8 DEHN Risk Tool: Focus on cost-effectiveness Correct interpretation of the result Each risk to be considered is displayed in a different colour. Blue stands for the tolerable risk, red or green for the risk calculated for the structure to be protected. RT R1 Without measures With measures % RT R1 61 % 2,52E-03 1E-5 6,14E-06 1E-5 Determination of the potential risks The risk components describe the potential risks for a structure. Therefore, the risk components must be considered in detail when performing a risk analysis. The aim of a risk analysis is to reduce the main risks by taking reasonable measures. Selection of measures in the DEHN Risk Tool Measures can be defined with the help of a selection matrix. These measures are displayed according to the risk components selected. Cost-effectiveness of protection measures Building owners are often faced with the question which damage can occur as a result of lightning effects and how high costs for protection measures should be with regard to the value of the building. Therefore, economic aspects are an important decision criterion. The risk analysis as per IEC integrated in the DEHN Risk Tool software provides a selection aid. Determination of the main risks Each risk component can be reduced or increased by different parameters. 8

9 Country-specific normative adaptations The standard IEC was the basis for EN of CENELEC. National conditions were taken into consideration when adopting the EN as national standards by the CENELEC members. Documentation and printout Country-specific standard designations and the associated national calculation values can be selected and displayed in the DEHN Risk Tool software. The results of the risk analysis can be printed as a summary or detailed report in the relevant language. The DEHNsupport Toolbox software is specified for the following countries: Austria Belgium Czech Republic Croatia France Germany Great Britain Hungary Italy Macedonia Poland Russia Slovakia CENELEC: European Committee for Electrotechnical Standardisation, 9

10 DEHN Distance Tool: Separation distances Basic Version: Conventional calculation as per IEC To prevent damage caused by lightning strikes, specific protection measures must be taken. Knowledge in the field of lightning research allowed to constantly further develop the method of calculating the separation distance. The current IEC standard points out that roof-mounted structures be located in the protected zone using air-termination rods or elevated air-termination systems (elevated ring conductor or spanned cables). To this end, the calculated separation distance s must be kept. The following general equation is used to calculate s: Distance Edition: Calculation according to nodal analysis In the Basic Version of the DEHN Distance Tool software, the separation distance is calculated with the help of an Excel table. The Basic Version can be upgraded to the Distance Version which allows to calculate the separation distance by means of nodal analysis. Nodal analysis is a method for network analysis used in electrical engineering. A constant earthing resistance is assumed for the calculation (type B earth electrode). Nodal analysis provides more exact results than a conventional calculation according to the IEC standard. s = k i k c k m l (m) where k i depends on the selected class of LPS k m depends on the electrical insulation material k c depends on the (partial) lightning current flowing through the air-termination systems and down conductors l is the length along the air-termination system or down conductor from the point where the separation distance is to be determined to the nearest equipotential bonding point or the earth-termination system. air-termination system Lightning Protection System according to IEC down-conductor system earth-termination system separation distances lightning equipotential bonding The length l can be disregarded in structures with continuous metal roofs acting as natural down conductor. 10

11 Visualisation as a 3D building model Automatic calculation of the separation distance and visualisation as a 3D building model To facilitate the user s work and to save time, building types can be selected from a picture gallery. After selecting and activating a building type, the dimensions of the building can be defined. The separation distances are calculated and visualised as a 3D building model after selecting the class of LPS. Free layout of complex buildings To meet the requirements of complex buildings, DEHN Distance Tool allows to adapt a building complex to customer needs. Different annexes and roof-mounted structures can be integrated in this building. Editing a LPS Mesh sizes often cannot be kept and air-termination systems have to be adapted to local conditions. The following changes can be made in the DEHN Distance Tool: inserting ring conductors adding down conductors inserting internal down conductors inserting air-termination rods inserting or deleting air-termination conductors and down conductors shifting air-termination conductors and down conductors shifting or raising the zero potential level inserting measuring points inserting points of strike inserting texts and notes LPS = Lightning Protection System 11

12 DEHN Air-Termination Tool: Length of air-termination rods Determining the length of air-termination rods Air-termination rods allow to integrate large areas in the protected zone of LPZ 0 B. DEHN Air-Termination Tool allows to determine the length of air-termination rods easily. In some cases, graphics, which must be created depending on the class of LPS, are required for this purpose. To facilitate work for qualified personnel, calculations for different kinds of graphics are integrated in the software. Calculation options: 1. Protective angle method 2. Rolling sphere method for one, two or four air-termination rods 3. Rolling sphere method for four air-termination rods on pitched roof surfaces To ensure a technically correct external lightning protection system, the protected zones must be properly dimensioned according to the height of the air-termination rod. LPS = Lightning Protection System 12

13 DEHN Earthing Tool: Length of earth electrodes Calculation of the length of earth electrodes The DEHN Earthing Tool allows to calculate the length of earth electrodes as per IEC In this context, the different types of earth electrodes are important: Foundation earth electrode, ring earth electrode or earth rod. The soil resistivity is also an important factor for determining the required length of the earth electrodes. 13

14 Seminars and support Increased know-how: DEHNsupport Toolbox seminar In one to two-day seminars, you will become acquainted with the fundamentals of risk management as per IEC Besides theoretical knowledge, each seminar also includes different practical exercises using the DEHNsupport Toolbox. In addition, you will learn how to calculate the separation distance, the length of air-termination rods and the length of earth electrodes. A computer with the relevant DEHNsupport Toolbox software version is available to each participant. This allows to directly apply the newly acquired skills in practice. Our support is there for you! We are happy to assist you in case of application problems. Phone: Monday to Friday from 8.00 a.m. to 4.00 p.m., CET. Our support team provides assistance in case of technical problems. Phone: Monday to Friday from 8.00 a.m. to 4.00 p.m., CET. Send us your questions by to dehnsupport@dehn.de The individual steps of a risk analysis are described in the brief instructions. DEHNsupport Toolbox brief instructions 14

15 Ordering information Different versions of the DEHNsupport software are available: DEHNsupport Basic Version software Including risk analysis, calculation of the length of the earth electrodes, calculation of the length of the air-termination rods and conventional calculation of the separation distance. Price: EUR 180 (excl. VAT) DEHNsupport Distance Edition software Including risk analysis, calculation of the length of the earth electrodes, calculation of the length of the air-termination rods and calculation of the separation distance according to nodal analysis. Price: EUR 275 (excl. VAT) Upgrade from Basic Version to Distance Edition An upgrade for calculating the separation distance according to nodal analysis is available for the Basic Version. Price: EUR 95 (excl. VAT) Multi-user system The price of multi-user systems for more than two workplaces depends on the number of users. Updates We will inform you about our free updates as soon as they are available. Ordering information The DEHNsupport software can be directly ordered from DEHN. The product includes two single-user licences and can be installed on the server. Please also observe the instructions in the Help menu item of the software. System requirements: Operating system: Microsoft Windows XP, Vista, 7, 8 or 8 Pro Minimum hardware requirements: Intel /AMD processor or compatible processor 500 MB free hard disc space 1500 MHz, 1 GB RAM (Windows XP ) 2000 MHz, 2 GB RAM (Windows Vista ) 2000 MHz, 2 GB RAM (Windows 7 /8 ) Monitor resolution of 1024 x 768 pixels 32 MB VGA graphics card 100 MBit/s network connection for multi-user systems Software: Microsoft Excel Test the DEHNsupport Toolbox and download the demo version from our homepage. DEHNsupport Toolbox 15

16 Surge Protection Lightning Protection Safety Equipment DEHN protects. DEHN + SÖHNE GmbH + Co.KG. Hans-Dehn-Str. 1 Postfach Neumarkt Germany Tel Fax info@dehn.de DEHNsupport Toolbox DEHN, DEHN logo are protected by German Trademark and/or are registered trademarks in other countries. We accept no liability for technical modifications, misprints and errors. Illustrations are not binding. DS709/E/1013 Copyright 2013 DEHN + SÖHNE Titel: Lightning Photo by Michael Bath,