DEHN + SÖHNE. DEHNconductor System No Problems with Proximities

Transcription

1 DEHN + SÖHNE DEHNconductor System No Problems with Proximities

2 DEHNconductor System - New Possibilities for controling Proximities. For preventing dangerous flashovers among parts of external lightning protection systems and internal conductive parts (electrical installation, conduits, etc.), keeping the separation distance s is an important requirement to be considered when planning and realising a lightning protection system. DEHNconductor System The separation distance has to be calculated according to the normative provisions by DIN V VDE V 0185 Part 3, Main Section 1, Subclause 5.3. Keeping the separation distance s is often a problem for new and existing installations. The innovative HVI conductor of the component range DEHNconductor System offers specifiers and constructors of lightning protection systems new possibilities to realise the keeping of the separation distance and to achieve a higher acceptance from the specifier and the owner of the building.

3 1 Connection HVI Conductor II with seperate Ring Conductor Structure an Function of HVI Conductor sepearte ring conductor distance holder e.g. Part No distance holder e.g. Part No a 0.5 m HVI -Conductor II connection with Without additional protective measures, high impulse voltages cause flashovers on surfaces of insulating materials. This effect is known as a creeping flashover. If the so-called creepage discharge inception voltage is exceeded, a surface sparkover is initiated that can range over a distance of some metres without problem. area protected against lightning strikes HVI Conductor II EB terminal Part No connection with For avoiding creepage discharges, the new HVI conductor is furnished with a special external coating that allows to direct high lightning impulse voltages to a reference potential. For this purpose, the special external coating is connected with the of the building (free of partial lightning currents) in the area of the unit. This can be performed at e.g. metal, earthed roof superstructures, situated in the protection area of the lightning protection system, at earthed parts of the building construction that is free of lightning currents or at the protective conductor of the low voltage system. Connecting the special coating with parts of the lightning protection system like the air termination or other down conductors, is not permissible. 2 Transistion roof conductor holder Part No adapter Part No conductor holder Part No conductor holder from HVI Conductor II to the non-isolated down conductor a 0.5 m non-isolated down conductor Avert high Lightning Impulse Voltages The coaxially structured HVI conductor with an outer diameter of 20 consists of a 19 2 copper wire, a thick, high-voltage resistant insulation and a special external weather-resistant coating. For avoiding low-energy flashovers due to capacitive displacement currents, HVI conductor can be connected additionally with the in the course of the wiring. These connections do not have to be capable of carrying lightning currents, as the capacitive displacement currents carry low energies and do not lead to hazardous sparkings. Comprehensive measurements have shown that HVI conductor can be assigned an equivalent separation distance of s = 0.75 m (in air) because of its high voltage resistance. The specification of this equivalent separation distance results in max. cable lengths depending on the protection level of the lightning protection system and the current division coefficient k c. Improving the current division over several down conductors (reduction of k c ), the max. cable lengths can be extended, if a protection level for the structure is provided.

4 HVI Conductor Product Range The prefabricated HVI conductor I (Fig. 1a) is furnished by the manufacturer with a connection element at the. On the earth side, an earth connection element is provided, which, however can be mounted onto the HVI conductor on site. This earth connection element is premounted on the earth side in delivery condition. Thus the length of HVI conductor I can be shortened on site. It is used for connecting the air termination of the external lightning protection directly with the earth termination system of the building via HVI conductor I. At the end of the an terminal is provided for connection with the. The prefabricated HVI conductor II with two head pieces (Fig. 1b) is furnished by the manufacturer with two adjusted s. Its length cannot be modified. The prefabricated HVI conductor III (Fig. 1c) is furnished by the manufacturer with a fixed unit, consisting of a and a fixed equipotential bonding element. Fig. 1a: HVI Conductor I Part No Fig. 1b: HVI Conductor II Part No element (fixed) HVI conductor with special coating element (fixed) earth connection element (removable) At the end of the conductor a unit itself can be created on site. The necessary components for the second unit (connection element with heatshrinkable sleeve and element) are included loosely in delivery. Thus, the length of HVI conductor III can be shortened at site. HVI conductors II and III are used, e.g. to connect several parts of the installation to be protected with the earth termination system of the building, not individually but together via a separate ring conductor. For sites with especially architectural requirements we recoend to install HVI conductor with an insulating pipe. Characteristic applications would be visually optimised antenna facilities. HVI conductor can be provided as three different types: 1. HVI conductor I with a fixed unit and detachable earth connection element according to Fig. 1a. 2. HVI conductor II with 2 fixed units according to Fig. 1b. 3. HVI conductor III with 1 fixed unit and 1 unit to be installed on site according to Fig 1c. Fig. 1c: HVI Conductor III Part No HVI conductor with special coating element (fixed) 1.40 m < x < 1.60 m element (loose) connection element COMPONENTS of the DEHNconductor System HVI conductor I High-voltage resistant isolated down conductor with for keeping the separation distance from conductive parts according to DIN V VDE V 0185 Part 3: Equivalent separation distance s = 0.75 m (in air). Consisting of: Core: Cu Insulation: PE Coating: PVC (b/w) semi-conductive, UV and weather-resistant, Diameter: 20 Head piece: StSt, Connection: D = 10 1 x element: StSt (V2A), for connection with Earth connection element: StSt (detachable), Connection D = 10. Min. order length: 4 m - Please indicate the conductor length required when placing your order. Cu variable length HVI conductor II High-voltage resistant isolated down conductor with two s for keeping the separation distance from conductive parts according to DIN V VDE V 0185 Part 3: Equivalent separation distance s = 0.75 m (in air). Consisting of: Core: Cu Insulation: PE Coating: PVC (b/w) semi-conductive, UV and weather-resistant, Diameter: 20 2 x Head piece: StSt, Connection: D = 10 2 x element: StSt (V2A), for connection with. Min. order length: 4 m - Please indicate the conductor length required when placing your order. Cu variable length HVI conductor III High-voltage resistant isolated down conductor with two s for keeping the separation distance from conductive parts according to DIN V VDE V 0185 Part 3: Equivalent separation distance s = 0.75 m (in air). Consisting of: Core: Cu Insulation: PE Coating: PVC (b/w) semi-conductive, UV and weather-resistant, Diameter: 20 Fixed end and a end to be created on site, Connection: D = 10, 2 x elements: StSt for connection with - Min. order length: 4 m - Please indicate the conductor length required when placing your order. Cu variable length Air Termination Tip with Lock Nut for screwing into the head of the insulating pipe and for connecting the HVI conductor. Al (D = 10 ) length Insulating Pipes for separate (isolated) construction of air termination systems with female thread M10, for e.g. air termination tip (Part No ) and for isolated fixing of the HVI conductor. GF-UP/Al length GF-UP/Al length GF-UP/Al length 6200 (separable) HVI conductor I in Insulating Pipe Installation in an insulating pipe. Type similar to HVI conductor I, but installed in an insulating pipe made of GF-UP/Al 50 x 4, Length: 3200, Air termination tip made of Al, Length: 1000, Type with special interior unit with EB connecting cable (Cu 6 2 ) and earth connection element. Min. order length: 6 m, Please indicate the length required when placing your order. Cu variable length HVI conductor II in Insulating Pipe Installation in an insulating pipe. Type similar to HVI conductor II, but installed in an insulating pipe made of GF-UP/Al 50 x 4, Length: 3200, Air termination tip made of Al, Length: 1000, Type with special interior unit with EB connecting cable (Cu 6 2 ) and second fixed unit. Min. order length: 6 m, Please indicate the length required when placing your order. Cu variable length HVI conductor III in Insulating Pipe Installation in an insulating pipe. Type similar to HVI conductor III, but installed in an insulating pipe made of GF-UP/Al 50 x 4, Length: 3200, Air termination tip made of Al, Length: 1000, Type with special interior unit with EB connecting cable (Cu 6 2 ) and second end to be created on site. Min. order length: 6 m, Please indicate the length required when placing your order. Cu variable length Fixing Clamp with Tensioning Strap for fixing the insulating pipes at construction elements, e.g. antenna masts. Clamping range of mast: D = 90 to Clamping range of insulating pipe: D = 50. StSt (V2A) D = Fixing Clamp with Tensioning Strap for fixing the insulating pipes at parts of the construction, e.g. antenna masts with sector antennas. Clamping range of mast: D = 90 to 300, Clamping range of insulating pipe: D = 50, additional distance unit: Length: 30 StSt (V2A) D = Angled Fixing Plate for fixing the insulating pipes at the construction to be protected or at walls. Clamping range of insulating pipe: D = 50 - Screw M10 StSt (V2A) - Fixing holes: 8 x 5.2 / 4 x 11 - Wall distance: 80. StSt (V2A) length Connecting Terminal Plate for connecting the HVI conductor with the air termination tip via two KS connectors, Part No Material Clamping range PU Part No. StSt (V2A) Rd Sealing Unit for connecting the HVI conductor with the air termination tip, e.g. with KS connector (Part No ), Square holes 11. StSt (V2A) hole distance KS Connector for connecting the HVI conductor or the air termination tip with the unit. Nut: M10 StSt (V2A). StSt (V2A) Rd = EB Terminal for connecting the special coating of the HVI conductor with the. Cross section area: Terminal: St/galZn. St/tZn D = Conductor Holder for installation of the HVI conductor at the mast with a tensioning strap. Clamp material: StSt (V2A) - Material of tensioning strap: StSt (V2A) Clamping range of mast: D = clamping screw M8 StSt (V2A). ZDC-St/tZn-StSt D = Conductor Holder for Tensioning Straps for installation of the HVI conductor at the insulating pipe (outside of the ). Clamp material: StSt (V2A) - Tensioning strap material: StSt (V2A) - Clamping range: D = StSt (V2A) D = Adapter for installation on flat roofs with roof conductor holder type FB (Part No ), snap-on unit. P D = Roof Conductor Holder Type FB for installing conductors on flat roofs. Stone: B45 - Weight 1 kg. plastic - concrete 100 x 100 x Roof Conductor Holder with angled brace for installing HVI conductors on gable roofs. RCH Brace length PU Part No. material St/tZn Roof Conductor Holder with straight brace for installing HVI conductors on gable roofs. RCH Brace length PU Part No. material St/tZn Roof Conductor Holder with cranked brace for installing HVI conductors on gable roofs. RCH Brace length PU Part No. material St/tZn Conductor Holder for wall mounting with female M8 thread (outside of the ). Complete unit with twin screw cleat and flange. Clamping range CH: D = 20. ZDC-St/tZn height Conductor Holder for wall mounting, plug-in dowels made of polyamide (can be installed within the ), UV-stabilised. Plug-in dawel: 6 x 35 - Hole diameter: 6. PA D = Distance Holder Distance rod made of GF-UP, L = 1000 with plug-in dowel made of polyamide (can be installed within the ). Clamping range CH: 20. GF-UP/PA D = Concrete Bases for distance holders, e.g. for elevating the unit or a separate ring conductor wedged support. Concrete (B55) D = 337 / 17 kg Flash washer for protection of the sheet roofings under the concrete base, e.g. Part No EVA D = Heat-Shrinkable Sleeve for visual matching of the HVI conductor at facades, white colour Material Size PU Part No. DERAY

5 Application of HVI Conductor at Cell Sites Cell sites are often installed on buildings of third parties. Normally, there is an agreement between the operator of the cell site and the owner of the structure, that the installation of the cell site does not lead to any additional risk for the structure. Regarding lightning protection this means especially that partial lightning currents must not enter the building at a lightning strike into the support construction. Partial lightning currents arising inside of the building threaten the electrical and electronic equipment. Fig. 1 illustrates a possible solution for an isolated air termination at an antenna support. The air termination rod has to be fixed at the antenna support construction with an insulating pipe of nonconductive material. The height of the air termination rod depends on the requirement that the support construction and eventually existing electrical installations of the cell site (basis transceiver station / BTS) have to be situated in the protection zone of the air termination rod. No partial lightning currents inside 1 antenna air termination rod AI L = 1000 Part No connection to the of the building KS connector Part No end range Protection angle according to VDE V 0185 Part 3, Table 3 head piece cable tie insulating pipe GFK/AI L = 3200 Part No connecting terminal plate Part No e.g. insulating clamp StSt ø 90 up to 300 Part No HVI Conductor I EB terminal Part No Air termination tip HVI Conductor Insulating pipe 2a HVI Conductor Insulating pipe Connection with equipotential bonding 2b Figs. 2a (insulating pipe in the area of the antenna) and 2b (connection with the at an antenna support construction) illustrate the installation performed on the roof of a building. e.g. to the earthed basis transceiver station (BTS) earth connection element earth termination system

6 Application of HVI Conductor for Protection of Roof Superstructures Metal and electrical roof superstructures overtop the roof level and are therefore exposed points for lightning strikes. Due to conduits and electrical conductors leading into the inside of a building, there is also a risk of vagabonding partial lightning currents. The entering of partial lightning currents into the building is prevented by keeping the required separation distance s over the complete building. This can be controlled easily, if the isolated air termination is connected via HVI conductor (Fig. 1). 1 connecting terminal plate Part No cable tie protection angle according to VDE V 0185 Part 3, Table 3 air termination rod L = 1000 Part No end range connection with of the building KS connector Part No By using HVI conductor, lightning currents can be easily conducted to the earth termination system without having to observe distances to metal and electrical parts. This means that additional measures for an isolated installation of air terminations and down conductors (distant installation according to separation distance s) are not required. metal earthed roof superstructure wall fixing Part No insulating pipe, GFK/AI Part No roof conductor holder Part No adapter Part No cable duct EB terminal Part No metal attic cover in the protective area of the isolated air termination Prevent the entering of partial lightning currents cable duct separation distance s conductor holder Part No HVI Conductor I earth connection element foundation earth electrode

7 DEHN + SÖHNE Technical Publications Ours detailed brochures covering individual products and product groups provide further technical information: Lightning Protection Main Catalogue Lightning Protection Surge Protection Safety Equipment DEHN + SÖHNE Hans-Dehn-Str. 1 Postfach Neumarkt Germany List of all DEHN Publications Please arrange for a visit of one of your Sales Engineers (by appointment) Tel Fax info@dehn.de Name Company Address Country Phone/Fax Please fill in and send to us! DS119/E/0404 COPYRIGHT 2004 DEHN + SÖHNE