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1 General information 1 / 17 SF 6 -gas Sulphur hexafluoride (molecule) Sulphur hexafluoride is a non-toxic, inert, insulating and quenching gas of high dielectric strength and thermal stability. colourless odourless 5 times heavier than air temperature resistant up to 500 C Insulating and cooling gas chemically inert non-toxic non-inflammable SF 6 is an important medium in the electrical industry where it is used as quenching and insulating gas for enclosed medium and high voltage switchgear. DILO D Babenhausen C

2 General information 2 / 17 Safety first! National and international committees established concepts for safe and environmentally friendly SF 6 -gas handling. The primary objects of these directives are: SF 6 -emissions should be avoided wherever possible. Complete recovery of SF 6 -gas down to min. 20mbar by using up-to-date maintenance devices. Maintenance is carried out by qualified personnel only. Monitoring: Operators and manufacturers give a report on their SF 6 consumption rate. The personnel working with SF 6 -gas is trained regularly. As from 4 th July 2009 only certified personnel is allowed to recover SF 6 -gas in the EU states in accordance with the EC 305/2008 directive. Manufacturers are obliged to take back equipment containing SF 6 -gas. Global warming potential (GWP) Examples: CO 2 (carbon dioxide) 1 Tetrafluorethane R-134a, HFC-134a CH 4 Methane 25 Fluorinated hydrocarbon FKW/HFKW up to Carbon monoxide N 2 O 298 Sulphur hexafluoride SF SF 6 has a high global warming potential DILO offers solutions to avoid SF 6 emissions! 6 C DILO D Babenhausen

3 General information 3 / 17 Directive on fluor gases Valid for fluorinating greenhouse gases - HFKW fluorocarbons HFC - FKW fluorocarbons PFC - SF 6 -gas sulphur hexafluoride (EC) 842/2006 Directive on fluor gases (EC) 305/2008 Minimum requirement for the certification of personnel (EC) 1493/2007 Definition of the form of report (EC) 1494/2007 Definition of labelling Aim: limitation and reduction of emission for fluorinating greenhouse gases As from 4 th July 2009 only certified personnel is allowed to recover SF 6 -gas. Area of application: EU (27 countries) Publication on 14 th June 2006 SF 6 is a major greenhouse gas with a global warming potential of more than 22,000 times higher than that of CO 2. Therefore, it is important to measure, monitor and capture SF 6, contributing significantly to environmental protection. - carbon dioxide (CO 2 ) - methane (CH 4 ) - carbon monoxide (N 2 O) also known as laughing gas - partially halogenated fluorohydrocarbons H-FKW/HFCs - perfluorinated hyrdocarbons FKW/PFCs - sulphur hexafluoride (SF 6 ) 170 members of states ratified the Kyoto protocol and committed to reduce emissions by 5.2% as from (compared with values of 1990). By using DILO SF 6 maintenance devices you meet the directives of national and international guidelines. (Recovery of SF 6 -gas down to 20mbar (2kpa) in accordance with IEC table 13, paragraph 4) DILO D Babenhausen C

4 General information 4 / 17 Use of SF 6 in medium and high voltage switchgear for more than 40 years. SF 6 maintenance devices, being equipped with compressors and operating entirely without oil and suction pumps for reclaiming SF 6 down to 1 mbar, are manufactured in accordance with the state-of-art technology. DILO measuring devices have been designed for verification of the SF 6 -gas quality for direct reuse of SF 6 in case the gas quality corresponds to the IEC60480 directive. New measuring devices are equipped with an integrated gas return system. DILO couplings are self-closing so that there is no loss of SF 6 -gas when connecting and reconnecting hoses on both ends. Since 2002, DILO measuring devices have been equipped with self-closing couplings. The measuring gas can be collected by means of the analyser discharge recovery system. 8 C DILO D Babenhausen

5 General information 5 / 17 Advantages of DILO SF 6 service carts All components used in SF 6 circulation such as compressors suction pumps vacuum compressors operate entirely without oil. Contamination of SF 6 -gas is not possible! Automatic drying and purification of SF 6 -gas during recovery and filling of SF 6 -gas Exchangeable filter cartridges The self-closing couplings guarantee safe SF 6 -gas handling, i.e.: No escape of SF 6 -gas No mixing with air The latest generation of our SF 6 maintenance devices provides comfortable operation via a 10 touch panel. Liquefaction of SF 6 -gas via pressure of the compressors. Storage in standard SF 6 bottles is possible. DILO D Babenhausen C

6 General information 6 / 17 Reuse of SF 6 -gas SF 6 -gas must be handled in a closed cycle to avoid SF 6 emissions. The diagram illustrated below explains a closed reuse concept by using DILO components. DILO measuring devices are designed to check the limit values for the reuse of SF 6 -gas according to the IEC directive for reuse gas. State of the art SF 6 -gas handling 1. Measuring the gas quality with a multi-function device (3 in 1) Decomposition products SF 6 volume percentage Dew point temperature The measuring gas is collected in an internal storage tank and is pumped back in the gas compartment after measurement. The measuring values can be stored in the device. 2. Recovery of contaminated gas, preparation and storage in liquid or gaseous form. 3. Registration of the recovered SF 6 -gas quantity (monitoring). 4. Measurement of the prepared gas (see item 1.). Collecting the measuring gas and pumping it back in the storage tank. 5. If the purified SF 6 -gas does not exceed the limit values of the IEC directive it is allowed to be reused. SF 6 -emissions should be avoided wherever possible! 10 C DILO D Babenhausen

7 General information 7 / 17 Basic functions of measuring devices Determination of SF 6 -gas condition Regular control of the gas quality is recommended in order to maintain the operational reliability of SF 6 -switchgear. Thus, gas contamination could be detected and eliminated in time before any failure of switchgear arises. The measured gas quality is an indicator for the following parameters: decomposition products (on SO 2 (sulphur dioxide) basis SF 6 -concentration in gas quantity (percentage) dew point temperature SF 6 -Multi Analyser - SF 6 concentration (%) - moisture concentration - SO 2 concentration (ppm V ) SF 6 Analyser 973 measurement of humidity and purity in gas insulated SF 6 switchgear Portable SO 2 measuring device Portable moisture measuring device Discharge gas collection unit SF 6 -volume percentage measuring device The purifying and reusing method is determined based on the measuring results. If the gas quality corresponds to the IEC regulation for reused SF 6 -gas it can be used without any additional treatment. (Follow the operating instructions of the switchgear manufacture.) DILO D Babenhausen C

8 General information 8 / 17 Basic functions of service carts Function: Recovery of SF 6 During the recovery of SF 6 -gas from circuit breakers the gas flows automatically through dry and particle filters where decomposition products, moisture and solid particles are retained effectively. For heavily contaminated gas ( 100 ppm SO 2 ), as well as for gas the quality of which is undefined it is absolutely necessary to install an additional pre-filter upstream from the gas handling device in order to protect the device from decomposition products. The time interval for exchanging the filter cartridges cannot be standardized as it depends on several factors. For this reason it is recommended to measure the gas quality. Gas handling device SF 6 circuit breaker Storage Recovery of SF 6 -gas: storage in gaseous or liquid form with oilfree suction pump down to 1 mbar (no SF 6 -gas emission) corresponds to the IEC directive (recovery of min. 2 kpa (20 mbar)) with oilfree vacuum compressor down to pa 50 mbar - residual gas emission 0.3 kg/m 3 vol. 12 C DILO D Babenhausen

9 General information 9 / 17 Function: Evacuation of air or nitrogen Prior to filling with SF 6 -gas the gas compartments must be evacuated to avoid mixing with air. For this, (oil-lubricated) vacuum pumps are used which only deliver into the atmosphere. They are only used for the evacuation of air. The evacuation of gas compartments before refilling with SF 6 -gas is only possible down to 1 mbar. Vacuum pumps with a higher final vacuum are available. Gas handling device SF 6 circuit breaker Storage exhausts into the atmosphere Evacuation of air to a final vacuum of < 1 mbar. DILO D Babenhausen C

10 General information 10 / 17 Function: Filling of SF 6 (to operating pressure) The purified SF 6 -gas can be filled back with overpressure or by means of the compressor in the gas compartment to the required operating pressure of the SF 6 -switchgear. The gas quality must correspond to the IEC directive for used SF 6 -gas (observe the instructions in the operating manual of the switchgear manufacturer). When filling back, the SF 6 -gas is led through the dry filter and particle filter once again. SF 6 -gas stored in liquid form is converted into gaseous form via the evaporator. Gas handling device Storage SF 6 circuit breaker 14 C DILO D Babenhausen

11 General information 11 / 17 Purification of SF 6 -gas for reuse Each gas handling device is equipped with dry and particle filters. The dry filter allows safe absorption of gaseous decomposition products and moisture. The filter cartridge is filled with AI 2 O 3 and molecular sieve and can easily be exchanged. The existing tubing does not have to be opened. The particle filter serves for filtering solid particles and decomposition products out of the SF 6 -gas. The filter cartridge is folded to a cylinder with star-shaped cross section. A retention rate of 100 % is obtained as from a particle size of 1.0 µm. More details are described in the operating instructions. IEC limit values for the reuse of SF 6 -gas Medium voltage: -23 C dew point Contamination Specification air and / or CF 4 3 vol.-% H 2 O 95 mg/kg (ppm W ) mineral oil 10 mg/kg (ppm W ) total amount of reactive, gaseous decomposition products 50 µl/l (ppm V ) (total) or 12 µl/l (ppm V ) for (SO 2 +SOF 2 ) or 25 µl/l (ppm V ) HF High voltage -36 C dew point Contamination Specification air and / or CF 4 3 vol.-% H 2 O 25 mg/kg (ppm W ) mineral oil 10 mg/kg (ppm W ) total amount of reactive, gaseous decomposition products 50 µl/l (ppm V ) (total) or 12 µl/l (ppm V ) for (SO 2 +SOF 2 ) or 25 µl/l (ppm V ) HF DILO D Babenhausen C

12 General information 12 / 17 Recovery times using SF 6 maintenance devices to a final pressure of 1 mbar with compressor and suction pump no SF 6 -gas emission 5 m long hose line DN 20 volume: litre Recovery pe 7 bar to pe 0 bar pressure in bar 4 3 L057R../B120R01 B052R B120R02 L170R.. /B2000R time in min. Recovery pa 1 bar to 1 mbar B052R11 pressure in mbar L170R../B2000R01 B120R02 L057R../B120R time in min. 16 C DILO D Babenhausen

13 General information 13 / 17 Recovery times using SF 6 maintenance devices to a final pressure of 50 mbar with compressor and vacuum compressor residual gas emission: g / litres vol. 5 m long hose line DN 20 volume: litres Recovery pe 7 bar to pe 0 bar pressure in mbar B120R21 / B057R01 / B052R02 B120R22 1 B058R time in min. Recovery pa 1 bar to 50 mbar pressure in mbar B058R B120R22 B120R21 / B057R01 / B052R time in min. DILO D Babenhausen C

14 General information 14 / 17 Recovery times using MINI SF 6 maintenance devices residual gas emission: g / litres vol. at 50 mbar 5 m long hose line DN 8 volume: 300 litres to a final pressure of 50 mbar with compressor and vacuum compressor The combination of B095R10 and B093R10 allows gas recovery down to 10 mbar. Recovery time from pe 6 bar to 0 bar pressure in bar 4 3 B093R10 + B095R10 B093R01 + B095R10 B093R01 + B095R01 B143R time in min. Recovery pa 1 bar to 10 mbar pressure in bar B093R10 + B095R10 B093R01 + B095R10 B093R01 + B095R01 B time in min. 18 C DILO D Babenhausen

15 General information 15 / 17 Evacuation volume Piccolo Economy / Compact Evacuating times in minutes delivery rate / final vacuum of vacuum pumps B120 / L057 / B058 / B057 B048R03 B046R03 Mega B2000 / L170 B046R20 16m 3 /h 40m 3 /h 25m 3 /h 40m 3 /h 63m 3 /h 100m 3 /h 200m³/h 40m 3 /h 65m 3 /h < 1 mbar < 1 mbar < mbar < 1 mbar < 1 mbar < 1 mbar < 1 mbar < 0,025 mbar 50 l l < 0,025 mbar 300 l l * 1000 l l Note for Mega series: The evacuating times of the Mega service carts could be reduced considerably by using a hose DN40. Parameters: Medium: Initial pressure: Final pressure: Hose: air pa 1 bar pa 1 mbar DN20 / NL5000 mm Determination of the evacuation time for other volumes: t E = determined filling time in minutes * t = time value from the table for 1000 litres in minutes V E = volume to be evacuated in liters t E = t x V E : 1000 l The above-mentioned evacuating times are standard values. DILO D Babenhausen C

16 General information 16 / 17 Best solutions for special requirements: SF 6 -network with main central station and different working stations Windows PC user interface Special SF 6 -gas handling plants with large and highly-efficient components DN 150 tubing Large pressure tanks for gaseous storage of SF 6 -gas Volume: 1000 to litres with gauge, safety valve, shut-off valve SF 6 -gas handling plants for SF 6 -filled accelerators with permanent monitoring of measuring gas 20 C DILO D Babenhausen

17 General information 17 / 17 Checklist for the selection of a service cart DILO has a wide range of SF 6 -service carts. Therefore, we are able to offer a suitable SF 6 -service cart for every special application. In order to assist us in selecting the most appropriate equipment we kindly ask you to answer the following questions: Answers How much SF 6 -gas is there in the biggest gas compartment? kg(s) What is the filling pressure (absolute) in the biggest gas compartment? What is the volume of the biggest gas compartment? litre(s) How many kgs of SF 6 -gas must be stored? kg(s) Do you intend to store the SF 6 -gas in gaseous or liquid form? Do you want to store the gas in tanks or in separate SF 6 -gas cylinders? Caution: When storing SF 6 in gaseous form in a 40l (volume) SF 6 -cylinder, you can store a maximum of approx. 6 kg of SF 6 -gas! Which connecting coupling do you have at your gas compartment? Please send us a drawing of the connecting coupling or of the gas connection on the circuit breaker. Max. distance between gas compartment and service cart? m(s) Do you wish to have a trailer-mounted service cart (only possible with TÜV-approval)? Do you wish to recover SF 6 -gas down to 50 mbar residual gas emission (absolute) or down to 1 mbar (absolute)? Please mark the required pressure with a cross. Is it necessary to observe certain times for the SF 6 -gas handling? If so, please indicate which times are required for the following operations for the biggest gas compartment: 50 mbar 1 mbar (does not correspond to the IEC , table 13, paragraph 4) a) Recovery of SF 6 min(s) b) Evacuation of air min(s) c) Filling with SF 6 min(s) Do you have certain requirements for the service carts? e. g. vinyl cover, lifting eyes, special pressure indication Other wishes e. g. measuring devices, pre-filter unit, working protection kit for decomposed SF 6 -gas, cylinder heater blanket? Please try to reply to these questions as detailed as possible. DILO D Babenhausen C

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