general information - eurosystem information c3187.pdf · dilo d-87727 babenhausen c 3187-00 5 sf...

General information

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DILO D-87727 Babenhausen C 3187-00 5

SF6-gas – Sulphur hexafluoride (molecule) Sulphur hexafluoride is a non-toxic, inert, insulating and quenching gas of high dielectric strength and thermal stability.

SF6 is an important medium in the electrical industry where it is used as quenching and insulating gas for enclosed medium and high voltage switchgear.

• colourless • odourless • 5 times heavier than air • temperature resistant up to 500°C • Insulating and cooling gas • chemically inert • non-toxic • non-inflammable

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6 C 3187-00 DILO D-87727 Babenhausen

Safety first! National and international committees established concepts for safe and environmentally friendly SF6-gas handling. The primary objects of these directives are:

• SF6-emissions should be avoided wherever possible. • Complete recovery of SF6-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 SF6 consumption rate. • The personnel working with SF6-gas is trained regularly. As from 4th July 2009 only

certified personnel is allowed to recover SF6-gas in the EU states in accordance with the EC 305/2008 directive.

• Manufacturers are obliged to take back equipment containing SF6-gas.

Global warming potential (GWP) Examples:

CO2 (carbon dioxide) 1 Tetrafluorethane R-134a, HFC-134a 1 430CH4 Methane 25 Fluorinated hydrocarbon FKW/HFKW up to 14 400Carbon monoxide N2O 298 Sulphur hexafluoride SF6 22 200 SF6 has a high global warming potential – DILO offers solutions to avoid SF6 emissions!

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Directive on fluor gases

By using DILO SF6 maintenance devices you meet the directives of national and international guidelines. (Recovery of SF6-gas down to ≤ 20mbar (2kpa) in accordance with IEC 62271-303 table 13, paragraph 4)

(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

Valid for fluorinating greenhouse gases - HFKW – fluorocarbons HFC - FKW – fluorocarbons PFC - SF6-gas sulphur hexafluoride Aim: limitation and reduction of emission for fluorinating greenhouse gases As from 4th July 2009 only certified personnel is allowed to recover SF6-gas. Area of application: EU (27 countries) Publication on 14th June 2006

SF6 is a major greenhouse gas with a global warming potential of more than 22,000 times higher than that of CO2. Therefore, it is important to measure, monitor and capture SF6, contributing significantly to environmental protection. - carbon dioxide (CO2) - methane (CH4) - carbon monoxide (N2O) also known as laughing gas - partially halogenated fluorohydrocarbons H-FKW/HFCs - perfluorinated hyrdocarbons FKW/PFCs - sulphur hexafluoride (SF6) 170 members of states ratified the Kyoto protocol and committed to reduce emissions by 5.2% as from 2008 – 2012 (compared with values of 1990).

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Use of SF6 in medium and high voltage switchgear for more than 40 years.

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.

SF6 maintenance devices, being equipped with compressorsand operating entirely without oil and suction pumps forreclaiming SF6 down to 1 mbar, are manufactured in accordance with the state-of-art technology.

DILO measuring devices have been designed for verification of the SF6-gas quality for direct reuse of SF6 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 SF6-gas when connecting and reconnecting hoses on both ends.

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Advantages of DILO SF6 service carts

All components used in SF6 circulation such as

• compressors • suction pumps • vacuum compressors

operate entirely without oil. Contamination of SF6-gas is not possible!

• Automatic drying and purification of SF6-gas during recovery and filling of SF6-gas • Exchangeable filter cartridges

The self-closing couplings guarantee safe SF6-gas handling, i.e.:

• No escape of SF6-gas • No mixing with air

The latest generation of our SF6 maintenance devices provides comfortable operation via a 10“ touch panel.

Liquefaction of SF6-gas via pressure of the compressors. Storage in standard SF6 bottles is possible.

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Reuse of SF6-gas SF6-gas must be handled in a closed cycle to avoid SF6 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 SF6-gas according to the IEC 60480 directive for “reuse gas“. “State of the art“ SF6-gas handling

1. Measuring the gas quality with a multi-function device (3 in 1) • Decomposition products • SF6 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 SF6-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 SF6-gas does not exceed the limit values of the IEC 60480 directive it is allowed to be reused.

SF6-emissions should be avoided – wherever possible!

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Basic functions of measuring devices Determination of SF6-gas condition Regular control of the gas quality is recommended in order to maintain the operational reliability of SF6-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 SO2 (sulphur dioxide) basis • SF6-concentration in gas quantity (percentage) • dew point temperature

The purifying and reusing method is determined based on the measuring results. If the gas quality corresponds to the IEC 60480 regulation for reused SF6-gas it can be used without any additional treatment. (Follow the operating instructions of the switchgear manufacture.)

Portable moisture measuring device

SF6 Analyser 973 measurement of humidity and purity in gas insulated SF6 switchgear

Portable SO2 measuring device

SF6-Multi Analyser - SF6 concentration (%) - moisture concentration - SO2 concentration (ppmV)

Discharge gas collection unit

SF6-volume percentage measuring device

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Basic functions of service carts Function: Recovery of SF6 During the recovery of SF6-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 SO2), 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.

Recovery of SF6-gas:

• storage in gaseous or liquid form • with oilfree suction pump down to 1 mbar (no SF6-gas emission) corresponds to the IEC 62271-303 directive (recovery of min. 2 kpa (20 mbar)) • with oilfree vacuum compressor down to pa 50 mbar - residual gas emission 0.3 kg/m3

vol.

Gas handling device

SF6 circuit breaker Storage

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Function: Evacuation of air or nitrogen Prior to filling with SF6-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 SF6-gas is only possible down to 1 mbar. Vacuum pumps with a higher final vacuum are available.

Evacuation of air to a final vacuum of < 1 mbar.

Gas handling device


exhausts into the atmosphere

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Function: Filling of SF6 (to operating pressure) The purified SF6-gas can be filled back with overpressure or by means of the compressor in the gas compartment to the required operating pressure of the SF6-switchgear. The gas quality must correspond to the IEC 60480 directive for used SF6-gas (observe the instructions in the operating manual of the switchgear manufacturer). When filling back, the SF6-gas is led through the dry filter and particle filter once again. SF6-gas stored in liquid form is converted into gaseous form via the evaporator.

Gas handling device


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Purification of SF6-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 AI2O3 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 SF6-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 60480 limit values for the reuse of SF6-gas Medium voltage: -23 °C dew point Contamination Specification air and / or CF4 3 vol.-%

H2O 95 mg/kg (ppmW)

mineral oil 10 mg/kg (ppmW)

total amount of reactive, gaseous decomposition products

50 µl/l (ppmV) (total) or 12 µl/l (ppmV) for (SO2+SOF2) or 25 µl/l (ppmV) HF

High voltage -36°C dew point Contamination Specification air and / or CF4 3 vol.-%

H2O 25 mg/kg (ppmW)

mineral oil 10 mg/kg (ppmW)

total amount of reactive, gaseous decomposition products

50 µl/l (ppmV) (total) or 12 µl/l (ppmV) for (SO2+SOF2) or 25 µl/l (ppmV) HF

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Recovery times using SF6 maintenance devices

• to a final pressure of 1 mbar – with compressor and suction pump • no SF6-gas emission • 5 m long hose line DN 20 • volume: 1.000 litre

Recovery pe 7 bar to pe 0 bar

0

1

2

3

4

5

6

7

0 10 20 30 40 50 60 70 80

time in min.

pres

sure

in b

ar

L170R.. /B2000R01

B120R02

B052R11L057R../B120R01

Recovery pa 1 bar to 1 mbar

1

10

100

1000

0 10 20 30 40 50 60 70 80 90

time in min.

pres

sure

in m

bar

5

20

50

2

L170R../B2000R01

B120R02L057R../B120R01

B052R11

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Recovery times using SF6 maintenance devices

• to a final pressure of 50 mbar – with compressor and vacuum compressor

residual gas emission: 0.304 g / litres vol. • 5 m long hose line DN 20 • volume: 1.000 litres

Recovery pe 7 bar to pe 0 bar

0

1

2

3

4

5

6

7

0 10 20 30 40 50 60 70

time in min.

pres

sure

in m

bar

B058R01

B120R21 / B057R01 / B052R02

B120R22


0

100

200

300

400

500

600

700

800

900

1000

0 20 40 60 80 100 120

time in min.

pres

sure

in m

bar

B058R01

B120R21 / B057R01 / B052R02

B120R22

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Recovery times using MINI SF6 maintenance devices

residual gas emission: 0.304 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

0

1

2

3

4

5

6

7

0 20 40 60 80 100 120

time in min.

pres

sure

in b

ar

B093R10 + B095R10B093R01 + B095R10B093R01 + B095R01B143R..


1

10

100

1000

0 20 40 60 80 100 120 140 160 180

time in min.

pres

sure

in b

ar B093R10 + B095R10B093R01 + B095R10B093R01 + B095R01B14320

50

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Evacuating times in minutes

delivery rate / final vacuum of vacuum pumps

Piccolo Economy / Compact

Mega

B120 / L057 / B058 / B057

B2000 / L170

B048R03 B046R03 B046R20

16m3/h 40m3/h 25m3/h 40m3/h 63m3/h 100m3/h 200m³/h 40m3/h 65m3/hEvacuation volume < 1 mbar < 1 mbar <

0.025 mbar

< 1 mbar

< 1 mbar

< 1 mbar

< 1 mbar < 0,025 mbar

< 0,025 mbar

50 l 4 2 1.5 1.5 1.5 1.3 1.1 1.5 1

100 l 8 4 3 3 3 2.5 2.2 2.5 2

300 l 24 12 10 9 8.5 7.5 6.6 7 5.5

500 l 40 20 16 15 14 12 11 11 9

* 1000 l 80 40 32 30 28 24 22 22 18

2000 l 160 80 64 60 56 48 44 44 36

Note for Mega series: The evacuating times of the Mega service carts could be reduced considerably by using a hose DN40.

Parameters: Medium: air Initial pressure: pa 1 bar Final pressure: pa 1 mbar Hose: DN20 / NL5000 mm Determination of the evacuation time for other volumes: tE = determined filling time in minutes * t = time value from the table for 1000 litres in minutes VE = volume to be evacuated in liters The above-mentioned evacuating times are standard values.

tE = t x VE : 1000 l

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Best solutions for special requirements:

SF6-network with main central station and different working stations Windows PC user interface

Special SF6-gas handling plants with large and highly-efficient components DN 150 tubing

Large pressure tanks for gaseous storage of SF6-gas Volume: 1000 to 10.000 litres with gauge, safety valve, shut-off valve

SF6-gas handling plants for SF6-filled accelerators with permanent monitoring of measuring gas

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Checklist for the selection of a service cart DILO has a wide range of SF6-service carts. Therefore, we are able to offer a suitable SF6-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 SF6-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 SF6-gas must be stored? kg(s)

• Do you intend to store the SF6-gas in gaseous or liquid form? Do you want to store the gas in tanks or in separate SF6-gas cylinders? Caution: When storing SF6 in gaseous form in a 40l (volume) SF6-cylinder, you can store a maximum of approx. 6 kg of SF6-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 SF6-gas down to 50 mbar residual gas emission (absolute) or down to 1 mbar (absolute)? Please mark the required pressure with a cross.

50 mbar 1 mbar

(does not correspond to the IEC 62271-303, table 13, paragraph 4)

• Is it necessary to observe certain times for the SF6-gas handling? If so, please indicate which times are required for the following operations for the biggest gas compartment:

a) Recovery of SF6 min(s) b) Evacuation of air min(s) c) Filling with SF6 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 SF6-gas, cylinder heater blanket?

Please try to reply to these questions as detailed as possible.

general information - eurosystem information c3187.pdf · dilo d-87727 babenhausen c 3187-00 5 sf...

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