Sulfur Hexafluoride (SF6)

Gas Handling

Description

bull Sulfur hexafluoride (SF6) in its pure state is inert nontoxic odorless nonflammable and colorless

bull It has excellent arc quenching properties and exhibits exceptional thermal stability

bull SF6 has exceptionally good insulating properties and at atmospheric pressure has 25 times the dielectric strength of air

bull SF6 gas at 2896 kPa (42 psig) has the same dielectric strength as transformer oil

bull Sulfur hexafluoride remains a gas without liquefying down to -344degC (-30degF) at the gas pressure normally used in the puffer type breaker

bull The density of SF6 is about five times that of air (molecular weight equal to 146)

bull Heat transfer by free convection is 16 times that of air at atmospheric pressure and 25 times the value of air at 2068 kPa (30 psig)

bull Arcing which will occur during the normal operation of the circuit breaker does not materially affect the insulating properties of the gas

bull The solid arc decomposition products observed as a fine gray powder have equally good dielectric properties however the powder will absorb moisture and become conducting if exposed to high humidity

bull Under normal conditions the arced by-products are not sufficient to require any restriction in operation However if the compartment is opened for any long period of time for maintenance the powder should be removed with a vacuum cleaner

Precautions Handling Arced SF6bull A chemical breakdown of sulfur hexafluoride

(SF6) occurs when it is exposed to a very high temperature or electrical arc as in the circuit breaker

bull The decomposition products gas and fine powder may be toxic strong irritants and attack the respiratory system

10486201048620104862010486201048620CAUTIONbull Arced SF6 gas is accompanied by a strong and irritating odor indicating

toxic decomposition products bull The arc products may be injurious and exposure to them should be avoidedbull The arc powders are reactive with moisture and if inhaled could cause

irritation in the nose throat and lungs Contact with body perspiration could cause skin irritation

bull A strong irritating odor is sufficient warning of the presence of the decomposition products This would normally be present only after several major fault interruptions or an unusual arcing condition within the gas enclosure If this condition occurs the area should be thoroughly ventilated

bull If work is necessary within this environment prior to the area being adequately ventilated a self-contained breathing mask should be used

bull Gas which has been subjected to heavy arcing and containing considerable decomposition products can be cleaned and reused

bull The gas should be circulated through molecular sieve filters to remove the active products

bull Most gas service trailers are equipped with molecular sieve filters and with provisions for circulating and cleaning the gas

10486201048620104862010486201048620CAUTIONAll freshly activated absorbents should be cooled to ambient temperature before introducing SF6 to avoid exothermic reaction

Large accumulations of powder (solid decomposition products) resulting from abnormal arcing conditions can be neutralized by mixing the powder in a bucket containing a solution of water and bicarbonate of soda and safely disposed

Handling of Sulfur Hexafluoride10486201048620104862010486201048620WARNINGbull Pure SF6 gas without oxygen (20) will not support life Do

not enter any tank previously containing SF6 without thorough ventilation

bull SF6 gas is heavier than air and will accumulate in or be trapped in low ldquopocketsrdquo Precautions should be observed in nearby ldquotrenchesrdquo and ldquodepressionsrdquo where the SF6 gas can accumulate for short periods of time before dispersing into the atmosphere

bull Sulfur hexafluoride is furnished in standard industrial type cylinders color which are usually coded green at the top end and the balance silver for easy identification

bull The gas is stored in the cylinders at its vaporization pressure which at 24degC (75degF) is 2241 kPa (325 psig)

10486201048620104862010486201048620CAUTIONbull Any connection made to the cylinders must be suitable

for 4137 kPa (600 psig) bull A pressure regulator is required when connecting a

cylinder to a gas compartment fitting

bull The gas compartment may be filled with gas directly from the cylinders or from a gas service trailer

bull When transferring the gas from the cylinders the process can be accelerated by keeping the cylinders warm to increase the rate of vaporization of the liquid SF6 stored in the cylinders This can be done by setting the cylinder in a tank of warm water maintained at a maximum temperature of 517degC (125degF)

10486201048620104862010486201048620WARNINGbull Do not allow the temperature of the SF6 cylinders either in

processing as above or in storage to exceed 517degC (125degF)bull Excessive temperature can result in overpressure and

potential failure of the cylinder

Greenhouse Gasbull SF6 gas has been identified by the Intergovernmental Panel on Climate

Change as a greenhouse gasldquo with the potential to contribute to global warming Therefore SF6 gas should not be deliberately released to the atmosphere

bull The gas handling and leak detection procedures described in this instruction book should be carefully followed to limit the amount of SF6 gas released over the life of the circuit breaker

bull Used SF6 gas even after internal arcing can be effectively filtered for recycling

bull Mitsubishi Electric Power Products circuit breakers are designed manufactured and factory tested to be free of leaks

bull If leaks develop while in service appropriate action to locate and eliminate the leaks should be taken

Material Safety Data SheetFor additional information concerning the composition and characteristics of sulfur hexafluoride gas review the product safety sheet supplied by the manufacturer of the SF6 gas

Pole Unitbull Each pole unit consists of a SF6 gas filled enclosure (Main Enclosure)

which contains the interrupter assembly supported by insulators at each end of the interrupter

bull Two porcelain bushing assemblies extend from the top of the main enclosure Conductors inside the bushings connect the interrupter assembly inside the metal main enclosures to the overhead line

bull The SF6 gas in the pole unit is common to the metal main enclosure and the porcelain bushings

bull An inspection cover is located at the end of the main enclosure to inspect and maintain the interrupters

bull An absorbent assembly is located on the inside of the inspection cover to maintain the dry atmosphere required inside the SF6 gas equipment

bull The rupture disc () is provided only when specifiedbull The SF6 gas is sealed in the main enclosure by O-

rings at each end of the enclosure O-rings in the slide seal assembly through which the operating rod passes and O-rings in the bushing assemblies

• Sulfur Hexafluoride (SF6) Gas Handling
• Slide 2
• Slide 3
• Slide 4
• Slide 5
• Slide 6
• Slide 7
• Slide 8
• Slide 9
• Slide 10
• Slide 11

Description

bull Sulfur hexafluoride (SF6) in its pure state is inert nontoxic odorless nonflammable and colorless

bull It has excellent arc quenching properties and exhibits exceptional thermal stability

bull SF6 has exceptionally good insulating properties and at atmospheric pressure has 25 times the dielectric strength of air

bull SF6 gas at 2896 kPa (42 psig) has the same dielectric strength as transformer oil

bull Sulfur hexafluoride remains a gas without liquefying down to -344degC (-30degF) at the gas pressure normally used in the puffer type breaker

bull The density of SF6 is about five times that of air (molecular weight equal to 146)

bull Heat transfer by free convection is 16 times that of air at atmospheric pressure and 25 times the value of air at 2068 kPa (30 psig)

bull Arcing which will occur during the normal operation of the circuit breaker does not materially affect the insulating properties of the gas

bull The solid arc decomposition products observed as a fine gray powder have equally good dielectric properties however the powder will absorb moisture and become conducting if exposed to high humidity

bull Under normal conditions the arced by-products are not sufficient to require any restriction in operation However if the compartment is opened for any long period of time for maintenance the powder should be removed with a vacuum cleaner

Precautions Handling Arced SF6bull A chemical breakdown of sulfur hexafluoride

(SF6) occurs when it is exposed to a very high temperature or electrical arc as in the circuit breaker

bull The decomposition products gas and fine powder may be toxic strong irritants and attack the respiratory system

10486201048620104862010486201048620CAUTIONbull Arced SF6 gas is accompanied by a strong and irritating odor indicating

toxic decomposition products bull The arc products may be injurious and exposure to them should be avoidedbull The arc powders are reactive with moisture and if inhaled could cause

irritation in the nose throat and lungs Contact with body perspiration could cause skin irritation

bull A strong irritating odor is sufficient warning of the presence of the decomposition products This would normally be present only after several major fault interruptions or an unusual arcing condition within the gas enclosure If this condition occurs the area should be thoroughly ventilated

bull If work is necessary within this environment prior to the area being adequately ventilated a self-contained breathing mask should be used

bull Gas which has been subjected to heavy arcing and containing considerable decomposition products can be cleaned and reused

bull The gas should be circulated through molecular sieve filters to remove the active products

bull Most gas service trailers are equipped with molecular sieve filters and with provisions for circulating and cleaning the gas

10486201048620104862010486201048620CAUTIONAll freshly activated absorbents should be cooled to ambient temperature before introducing SF6 to avoid exothermic reaction

Large accumulations of powder (solid decomposition products) resulting from abnormal arcing conditions can be neutralized by mixing the powder in a bucket containing a solution of water and bicarbonate of soda and safely disposed

Handling of Sulfur Hexafluoride10486201048620104862010486201048620WARNINGbull Pure SF6 gas without oxygen (20) will not support life Do

not enter any tank previously containing SF6 without thorough ventilation

bull SF6 gas is heavier than air and will accumulate in or be trapped in low ldquopocketsrdquo Precautions should be observed in nearby ldquotrenchesrdquo and ldquodepressionsrdquo where the SF6 gas can accumulate for short periods of time before dispersing into the atmosphere

bull Sulfur hexafluoride is furnished in standard industrial type cylinders color which are usually coded green at the top end and the balance silver for easy identification

bull The gas is stored in the cylinders at its vaporization pressure which at 24degC (75degF) is 2241 kPa (325 psig)

10486201048620104862010486201048620CAUTIONbull Any connection made to the cylinders must be suitable

for 4137 kPa (600 psig) bull A pressure regulator is required when connecting a

cylinder to a gas compartment fitting

bull The gas compartment may be filled with gas directly from the cylinders or from a gas service trailer

bull When transferring the gas from the cylinders the process can be accelerated by keeping the cylinders warm to increase the rate of vaporization of the liquid SF6 stored in the cylinders This can be done by setting the cylinder in a tank of warm water maintained at a maximum temperature of 517degC (125degF)

10486201048620104862010486201048620WARNINGbull Do not allow the temperature of the SF6 cylinders either in

processing as above or in storage to exceed 517degC (125degF)bull Excessive temperature can result in overpressure and

potential failure of the cylinder

Greenhouse Gasbull SF6 gas has been identified by the Intergovernmental Panel on Climate

Change as a greenhouse gasldquo with the potential to contribute to global warming Therefore SF6 gas should not be deliberately released to the atmosphere

bull The gas handling and leak detection procedures described in this instruction book should be carefully followed to limit the amount of SF6 gas released over the life of the circuit breaker

bull Used SF6 gas even after internal arcing can be effectively filtered for recycling

bull Mitsubishi Electric Power Products circuit breakers are designed manufactured and factory tested to be free of leaks

bull If leaks develop while in service appropriate action to locate and eliminate the leaks should be taken

Material Safety Data SheetFor additional information concerning the composition and characteristics of sulfur hexafluoride gas review the product safety sheet supplied by the manufacturer of the SF6 gas

Pole Unitbull Each pole unit consists of a SF6 gas filled enclosure (Main Enclosure)

which contains the interrupter assembly supported by insulators at each end of the interrupter

bull Two porcelain bushing assemblies extend from the top of the main enclosure Conductors inside the bushings connect the interrupter assembly inside the metal main enclosures to the overhead line

bull The SF6 gas in the pole unit is common to the metal main enclosure and the porcelain bushings

bull An inspection cover is located at the end of the main enclosure to inspect and maintain the interrupters

bull An absorbent assembly is located on the inside of the inspection cover to maintain the dry atmosphere required inside the SF6 gas equipment

bull The rupture disc () is provided only when specifiedbull The SF6 gas is sealed in the main enclosure by O-

rings at each end of the enclosure O-rings in the slide seal assembly through which the operating rod passes and O-rings in the bushing assemblies

• Sulfur Hexafluoride (SF6) Gas Handling
• Slide 2
• Slide 3
• Slide 4
• Slide 5
• Slide 6
• Slide 7
• Slide 8
• Slide 9
• Slide 10
• Slide 11

bull Arcing which will occur during the normal operation of the circuit breaker does not materially affect the insulating properties of the gas

bull The solid arc decomposition products observed as a fine gray powder have equally good dielectric properties however the powder will absorb moisture and become conducting if exposed to high humidity

bull Under normal conditions the arced by-products are not sufficient to require any restriction in operation However if the compartment is opened for any long period of time for maintenance the powder should be removed with a vacuum cleaner

Precautions Handling Arced SF6bull A chemical breakdown of sulfur hexafluoride

(SF6) occurs when it is exposed to a very high temperature or electrical arc as in the circuit breaker

bull The decomposition products gas and fine powder may be toxic strong irritants and attack the respiratory system

10486201048620104862010486201048620CAUTIONbull Arced SF6 gas is accompanied by a strong and irritating odor indicating

toxic decomposition products bull The arc products may be injurious and exposure to them should be avoidedbull The arc powders are reactive with moisture and if inhaled could cause

irritation in the nose throat and lungs Contact with body perspiration could cause skin irritation

bull A strong irritating odor is sufficient warning of the presence of the decomposition products This would normally be present only after several major fault interruptions or an unusual arcing condition within the gas enclosure If this condition occurs the area should be thoroughly ventilated

bull If work is necessary within this environment prior to the area being adequately ventilated a self-contained breathing mask should be used

bull Gas which has been subjected to heavy arcing and containing considerable decomposition products can be cleaned and reused

bull The gas should be circulated through molecular sieve filters to remove the active products

bull Most gas service trailers are equipped with molecular sieve filters and with provisions for circulating and cleaning the gas

10486201048620104862010486201048620CAUTIONAll freshly activated absorbents should be cooled to ambient temperature before introducing SF6 to avoid exothermic reaction

Large accumulations of powder (solid decomposition products) resulting from abnormal arcing conditions can be neutralized by mixing the powder in a bucket containing a solution of water and bicarbonate of soda and safely disposed

Handling of Sulfur Hexafluoride10486201048620104862010486201048620WARNINGbull Pure SF6 gas without oxygen (20) will not support life Do

not enter any tank previously containing SF6 without thorough ventilation

bull SF6 gas is heavier than air and will accumulate in or be trapped in low ldquopocketsrdquo Precautions should be observed in nearby ldquotrenchesrdquo and ldquodepressionsrdquo where the SF6 gas can accumulate for short periods of time before dispersing into the atmosphere

bull Sulfur hexafluoride is furnished in standard industrial type cylinders color which are usually coded green at the top end and the balance silver for easy identification

bull The gas is stored in the cylinders at its vaporization pressure which at 24degC (75degF) is 2241 kPa (325 psig)

10486201048620104862010486201048620CAUTIONbull Any connection made to the cylinders must be suitable

for 4137 kPa (600 psig) bull A pressure regulator is required when connecting a

cylinder to a gas compartment fitting

bull The gas compartment may be filled with gas directly from the cylinders or from a gas service trailer

bull When transferring the gas from the cylinders the process can be accelerated by keeping the cylinders warm to increase the rate of vaporization of the liquid SF6 stored in the cylinders This can be done by setting the cylinder in a tank of warm water maintained at a maximum temperature of 517degC (125degF)

10486201048620104862010486201048620WARNINGbull Do not allow the temperature of the SF6 cylinders either in

processing as above or in storage to exceed 517degC (125degF)bull Excessive temperature can result in overpressure and

potential failure of the cylinder

Greenhouse Gasbull SF6 gas has been identified by the Intergovernmental Panel on Climate

Change as a greenhouse gasldquo with the potential to contribute to global warming Therefore SF6 gas should not be deliberately released to the atmosphere

bull The gas handling and leak detection procedures described in this instruction book should be carefully followed to limit the amount of SF6 gas released over the life of the circuit breaker

bull Used SF6 gas even after internal arcing can be effectively filtered for recycling

bull Mitsubishi Electric Power Products circuit breakers are designed manufactured and factory tested to be free of leaks

bull If leaks develop while in service appropriate action to locate and eliminate the leaks should be taken

Material Safety Data SheetFor additional information concerning the composition and characteristics of sulfur hexafluoride gas review the product safety sheet supplied by the manufacturer of the SF6 gas

Pole Unitbull Each pole unit consists of a SF6 gas filled enclosure (Main Enclosure)

which contains the interrupter assembly supported by insulators at each end of the interrupter

bull Two porcelain bushing assemblies extend from the top of the main enclosure Conductors inside the bushings connect the interrupter assembly inside the metal main enclosures to the overhead line

bull The SF6 gas in the pole unit is common to the metal main enclosure and the porcelain bushings

bull An inspection cover is located at the end of the main enclosure to inspect and maintain the interrupters

bull An absorbent assembly is located on the inside of the inspection cover to maintain the dry atmosphere required inside the SF6 gas equipment

bull The rupture disc () is provided only when specifiedbull The SF6 gas is sealed in the main enclosure by O-

rings at each end of the enclosure O-rings in the slide seal assembly through which the operating rod passes and O-rings in the bushing assemblies

• Sulfur Hexafluoride (SF6) Gas Handling
• Slide 2
• Slide 3
• Slide 4
• Slide 5
• Slide 6
• Slide 7
• Slide 8
• Slide 9
• Slide 10
• Slide 11

Precautions Handling Arced SF6bull A chemical breakdown of sulfur hexafluoride

(SF6) occurs when it is exposed to a very high temperature or electrical arc as in the circuit breaker

bull The decomposition products gas and fine powder may be toxic strong irritants and attack the respiratory system

10486201048620104862010486201048620CAUTIONbull Arced SF6 gas is accompanied by a strong and irritating odor indicating

toxic decomposition products bull The arc products may be injurious and exposure to them should be avoidedbull The arc powders are reactive with moisture and if inhaled could cause

irritation in the nose throat and lungs Contact with body perspiration could cause skin irritation

bull A strong irritating odor is sufficient warning of the presence of the decomposition products This would normally be present only after several major fault interruptions or an unusual arcing condition within the gas enclosure If this condition occurs the area should be thoroughly ventilated

bull If work is necessary within this environment prior to the area being adequately ventilated a self-contained breathing mask should be used

bull Gas which has been subjected to heavy arcing and containing considerable decomposition products can be cleaned and reused

bull The gas should be circulated through molecular sieve filters to remove the active products

bull Most gas service trailers are equipped with molecular sieve filters and with provisions for circulating and cleaning the gas

10486201048620104862010486201048620CAUTIONAll freshly activated absorbents should be cooled to ambient temperature before introducing SF6 to avoid exothermic reaction

Large accumulations of powder (solid decomposition products) resulting from abnormal arcing conditions can be neutralized by mixing the powder in a bucket containing a solution of water and bicarbonate of soda and safely disposed

Handling of Sulfur Hexafluoride10486201048620104862010486201048620WARNINGbull Pure SF6 gas without oxygen (20) will not support life Do

not enter any tank previously containing SF6 without thorough ventilation

bull SF6 gas is heavier than air and will accumulate in or be trapped in low ldquopocketsrdquo Precautions should be observed in nearby ldquotrenchesrdquo and ldquodepressionsrdquo where the SF6 gas can accumulate for short periods of time before dispersing into the atmosphere

bull Sulfur hexafluoride is furnished in standard industrial type cylinders color which are usually coded green at the top end and the balance silver for easy identification

bull The gas is stored in the cylinders at its vaporization pressure which at 24degC (75degF) is 2241 kPa (325 psig)

10486201048620104862010486201048620CAUTIONbull Any connection made to the cylinders must be suitable

for 4137 kPa (600 psig) bull A pressure regulator is required when connecting a

cylinder to a gas compartment fitting

bull The gas compartment may be filled with gas directly from the cylinders or from a gas service trailer

bull When transferring the gas from the cylinders the process can be accelerated by keeping the cylinders warm to increase the rate of vaporization of the liquid SF6 stored in the cylinders This can be done by setting the cylinder in a tank of warm water maintained at a maximum temperature of 517degC (125degF)

10486201048620104862010486201048620WARNINGbull Do not allow the temperature of the SF6 cylinders either in

processing as above or in storage to exceed 517degC (125degF)bull Excessive temperature can result in overpressure and

potential failure of the cylinder

Greenhouse Gasbull SF6 gas has been identified by the Intergovernmental Panel on Climate

Change as a greenhouse gasldquo with the potential to contribute to global warming Therefore SF6 gas should not be deliberately released to the atmosphere

bull The gas handling and leak detection procedures described in this instruction book should be carefully followed to limit the amount of SF6 gas released over the life of the circuit breaker

bull Used SF6 gas even after internal arcing can be effectively filtered for recycling

bull Mitsubishi Electric Power Products circuit breakers are designed manufactured and factory tested to be free of leaks

bull If leaks develop while in service appropriate action to locate and eliminate the leaks should be taken

Material Safety Data SheetFor additional information concerning the composition and characteristics of sulfur hexafluoride gas review the product safety sheet supplied by the manufacturer of the SF6 gas

Pole Unitbull Each pole unit consists of a SF6 gas filled enclosure (Main Enclosure)

which contains the interrupter assembly supported by insulators at each end of the interrupter

bull Two porcelain bushing assemblies extend from the top of the main enclosure Conductors inside the bushings connect the interrupter assembly inside the metal main enclosures to the overhead line

bull The SF6 gas in the pole unit is common to the metal main enclosure and the porcelain bushings

bull An inspection cover is located at the end of the main enclosure to inspect and maintain the interrupters

bull An absorbent assembly is located on the inside of the inspection cover to maintain the dry atmosphere required inside the SF6 gas equipment

bull The rupture disc () is provided only when specifiedbull The SF6 gas is sealed in the main enclosure by O-

rings at each end of the enclosure O-rings in the slide seal assembly through which the operating rod passes and O-rings in the bushing assemblies

• Sulfur Hexafluoride (SF6) Gas Handling
• Slide 2
• Slide 3
• Slide 4
• Slide 5
• Slide 6
• Slide 7
• Slide 8
• Slide 9
• Slide 10
• Slide 11

bull A strong irritating odor is sufficient warning of the presence of the decomposition products This would normally be present only after several major fault interruptions or an unusual arcing condition within the gas enclosure If this condition occurs the area should be thoroughly ventilated

bull If work is necessary within this environment prior to the area being adequately ventilated a self-contained breathing mask should be used

bull Gas which has been subjected to heavy arcing and containing considerable decomposition products can be cleaned and reused

bull The gas should be circulated through molecular sieve filters to remove the active products

bull Most gas service trailers are equipped with molecular sieve filters and with provisions for circulating and cleaning the gas

10486201048620104862010486201048620CAUTIONAll freshly activated absorbents should be cooled to ambient temperature before introducing SF6 to avoid exothermic reaction

Large accumulations of powder (solid decomposition products) resulting from abnormal arcing conditions can be neutralized by mixing the powder in a bucket containing a solution of water and bicarbonate of soda and safely disposed

Handling of Sulfur Hexafluoride10486201048620104862010486201048620WARNINGbull Pure SF6 gas without oxygen (20) will not support life Do

not enter any tank previously containing SF6 without thorough ventilation

bull SF6 gas is heavier than air and will accumulate in or be trapped in low ldquopocketsrdquo Precautions should be observed in nearby ldquotrenchesrdquo and ldquodepressionsrdquo where the SF6 gas can accumulate for short periods of time before dispersing into the atmosphere

bull Sulfur hexafluoride is furnished in standard industrial type cylinders color which are usually coded green at the top end and the balance silver for easy identification

bull The gas is stored in the cylinders at its vaporization pressure which at 24degC (75degF) is 2241 kPa (325 psig)

10486201048620104862010486201048620CAUTIONbull Any connection made to the cylinders must be suitable

for 4137 kPa (600 psig) bull A pressure regulator is required when connecting a

cylinder to a gas compartment fitting

bull The gas compartment may be filled with gas directly from the cylinders or from a gas service trailer

bull When transferring the gas from the cylinders the process can be accelerated by keeping the cylinders warm to increase the rate of vaporization of the liquid SF6 stored in the cylinders This can be done by setting the cylinder in a tank of warm water maintained at a maximum temperature of 517degC (125degF)

10486201048620104862010486201048620WARNINGbull Do not allow the temperature of the SF6 cylinders either in

processing as above or in storage to exceed 517degC (125degF)bull Excessive temperature can result in overpressure and

potential failure of the cylinder

Greenhouse Gasbull SF6 gas has been identified by the Intergovernmental Panel on Climate

Change as a greenhouse gasldquo with the potential to contribute to global warming Therefore SF6 gas should not be deliberately released to the atmosphere

bull The gas handling and leak detection procedures described in this instruction book should be carefully followed to limit the amount of SF6 gas released over the life of the circuit breaker

bull Used SF6 gas even after internal arcing can be effectively filtered for recycling

bull Mitsubishi Electric Power Products circuit breakers are designed manufactured and factory tested to be free of leaks

bull If leaks develop while in service appropriate action to locate and eliminate the leaks should be taken

Material Safety Data SheetFor additional information concerning the composition and characteristics of sulfur hexafluoride gas review the product safety sheet supplied by the manufacturer of the SF6 gas

Pole Unitbull Each pole unit consists of a SF6 gas filled enclosure (Main Enclosure)

which contains the interrupter assembly supported by insulators at each end of the interrupter

bull Two porcelain bushing assemblies extend from the top of the main enclosure Conductors inside the bushings connect the interrupter assembly inside the metal main enclosures to the overhead line

bull The SF6 gas in the pole unit is common to the metal main enclosure and the porcelain bushings

bull An inspection cover is located at the end of the main enclosure to inspect and maintain the interrupters

bull An absorbent assembly is located on the inside of the inspection cover to maintain the dry atmosphere required inside the SF6 gas equipment

bull The rupture disc () is provided only when specifiedbull The SF6 gas is sealed in the main enclosure by O-

rings at each end of the enclosure O-rings in the slide seal assembly through which the operating rod passes and O-rings in the bushing assemblies

• Sulfur Hexafluoride (SF6) Gas Handling
• Slide 2
• Slide 3
• Slide 4
• Slide 5
• Slide 6
• Slide 7
• Slide 8
• Slide 9
• Slide 10
• Slide 11

10486201048620104862010486201048620CAUTIONAll freshly activated absorbents should be cooled to ambient temperature before introducing SF6 to avoid exothermic reaction

Large accumulations of powder (solid decomposition products) resulting from abnormal arcing conditions can be neutralized by mixing the powder in a bucket containing a solution of water and bicarbonate of soda and safely disposed

Handling of Sulfur Hexafluoride10486201048620104862010486201048620WARNINGbull Pure SF6 gas without oxygen (20) will not support life Do

not enter any tank previously containing SF6 without thorough ventilation

bull SF6 gas is heavier than air and will accumulate in or be trapped in low ldquopocketsrdquo Precautions should be observed in nearby ldquotrenchesrdquo and ldquodepressionsrdquo where the SF6 gas can accumulate for short periods of time before dispersing into the atmosphere

bull Sulfur hexafluoride is furnished in standard industrial type cylinders color which are usually coded green at the top end and the balance silver for easy identification

bull The gas is stored in the cylinders at its vaporization pressure which at 24degC (75degF) is 2241 kPa (325 psig)

10486201048620104862010486201048620CAUTIONbull Any connection made to the cylinders must be suitable

for 4137 kPa (600 psig) bull A pressure regulator is required when connecting a

cylinder to a gas compartment fitting

bull The gas compartment may be filled with gas directly from the cylinders or from a gas service trailer

bull When transferring the gas from the cylinders the process can be accelerated by keeping the cylinders warm to increase the rate of vaporization of the liquid SF6 stored in the cylinders This can be done by setting the cylinder in a tank of warm water maintained at a maximum temperature of 517degC (125degF)

10486201048620104862010486201048620WARNINGbull Do not allow the temperature of the SF6 cylinders either in

processing as above or in storage to exceed 517degC (125degF)bull Excessive temperature can result in overpressure and

potential failure of the cylinder

Greenhouse Gasbull SF6 gas has been identified by the Intergovernmental Panel on Climate

Change as a greenhouse gasldquo with the potential to contribute to global warming Therefore SF6 gas should not be deliberately released to the atmosphere

bull The gas handling and leak detection procedures described in this instruction book should be carefully followed to limit the amount of SF6 gas released over the life of the circuit breaker

bull Used SF6 gas even after internal arcing can be effectively filtered for recycling

bull Mitsubishi Electric Power Products circuit breakers are designed manufactured and factory tested to be free of leaks

bull If leaks develop while in service appropriate action to locate and eliminate the leaks should be taken

Material Safety Data SheetFor additional information concerning the composition and characteristics of sulfur hexafluoride gas review the product safety sheet supplied by the manufacturer of the SF6 gas

Pole Unitbull Each pole unit consists of a SF6 gas filled enclosure (Main Enclosure)

which contains the interrupter assembly supported by insulators at each end of the interrupter

bull Two porcelain bushing assemblies extend from the top of the main enclosure Conductors inside the bushings connect the interrupter assembly inside the metal main enclosures to the overhead line

bull The SF6 gas in the pole unit is common to the metal main enclosure and the porcelain bushings

bull An inspection cover is located at the end of the main enclosure to inspect and maintain the interrupters

bull An absorbent assembly is located on the inside of the inspection cover to maintain the dry atmosphere required inside the SF6 gas equipment

bull The rupture disc () is provided only when specifiedbull The SF6 gas is sealed in the main enclosure by O-

rings at each end of the enclosure O-rings in the slide seal assembly through which the operating rod passes and O-rings in the bushing assemblies

• Sulfur Hexafluoride (SF6) Gas Handling
• Slide 2
• Slide 3
• Slide 4
• Slide 5
• Slide 6
• Slide 7
• Slide 8
• Slide 9
• Slide 10
• Slide 11

Handling of Sulfur Hexafluoride10486201048620104862010486201048620WARNINGbull Pure SF6 gas without oxygen (20) will not support life Do

not enter any tank previously containing SF6 without thorough ventilation

bull SF6 gas is heavier than air and will accumulate in or be trapped in low ldquopocketsrdquo Precautions should be observed in nearby ldquotrenchesrdquo and ldquodepressionsrdquo where the SF6 gas can accumulate for short periods of time before dispersing into the atmosphere

bull Sulfur hexafluoride is furnished in standard industrial type cylinders color which are usually coded green at the top end and the balance silver for easy identification

bull The gas is stored in the cylinders at its vaporization pressure which at 24degC (75degF) is 2241 kPa (325 psig)

10486201048620104862010486201048620CAUTIONbull Any connection made to the cylinders must be suitable

for 4137 kPa (600 psig) bull A pressure regulator is required when connecting a

cylinder to a gas compartment fitting

bull The gas compartment may be filled with gas directly from the cylinders or from a gas service trailer

bull When transferring the gas from the cylinders the process can be accelerated by keeping the cylinders warm to increase the rate of vaporization of the liquid SF6 stored in the cylinders This can be done by setting the cylinder in a tank of warm water maintained at a maximum temperature of 517degC (125degF)

10486201048620104862010486201048620WARNINGbull Do not allow the temperature of the SF6 cylinders either in

processing as above or in storage to exceed 517degC (125degF)bull Excessive temperature can result in overpressure and

potential failure of the cylinder

Greenhouse Gasbull SF6 gas has been identified by the Intergovernmental Panel on Climate

Change as a greenhouse gasldquo with the potential to contribute to global warming Therefore SF6 gas should not be deliberately released to the atmosphere

bull The gas handling and leak detection procedures described in this instruction book should be carefully followed to limit the amount of SF6 gas released over the life of the circuit breaker

bull Used SF6 gas even after internal arcing can be effectively filtered for recycling

bull Mitsubishi Electric Power Products circuit breakers are designed manufactured and factory tested to be free of leaks

bull If leaks develop while in service appropriate action to locate and eliminate the leaks should be taken

Material Safety Data SheetFor additional information concerning the composition and characteristics of sulfur hexafluoride gas review the product safety sheet supplied by the manufacturer of the SF6 gas

Pole Unitbull Each pole unit consists of a SF6 gas filled enclosure (Main Enclosure)

which contains the interrupter assembly supported by insulators at each end of the interrupter

bull Two porcelain bushing assemblies extend from the top of the main enclosure Conductors inside the bushings connect the interrupter assembly inside the metal main enclosures to the overhead line

bull The SF6 gas in the pole unit is common to the metal main enclosure and the porcelain bushings

bull An inspection cover is located at the end of the main enclosure to inspect and maintain the interrupters

bull An absorbent assembly is located on the inside of the inspection cover to maintain the dry atmosphere required inside the SF6 gas equipment

bull The rupture disc () is provided only when specifiedbull The SF6 gas is sealed in the main enclosure by O-

rings at each end of the enclosure O-rings in the slide seal assembly through which the operating rod passes and O-rings in the bushing assemblies

• Sulfur Hexafluoride (SF6) Gas Handling
• Slide 2
• Slide 3
• Slide 4
• Slide 5
• Slide 6
• Slide 7
• Slide 8
• Slide 9
• Slide 10
• Slide 11

10486201048620104862010486201048620CAUTIONbull Any connection made to the cylinders must be suitable

for 4137 kPa (600 psig) bull A pressure regulator is required when connecting a

cylinder to a gas compartment fitting

bull The gas compartment may be filled with gas directly from the cylinders or from a gas service trailer

bull When transferring the gas from the cylinders the process can be accelerated by keeping the cylinders warm to increase the rate of vaporization of the liquid SF6 stored in the cylinders This can be done by setting the cylinder in a tank of warm water maintained at a maximum temperature of 517degC (125degF)

10486201048620104862010486201048620WARNINGbull Do not allow the temperature of the SF6 cylinders either in

processing as above or in storage to exceed 517degC (125degF)bull Excessive temperature can result in overpressure and

potential failure of the cylinder

Greenhouse Gasbull SF6 gas has been identified by the Intergovernmental Panel on Climate

Change as a greenhouse gasldquo with the potential to contribute to global warming Therefore SF6 gas should not be deliberately released to the atmosphere

bull The gas handling and leak detection procedures described in this instruction book should be carefully followed to limit the amount of SF6 gas released over the life of the circuit breaker

bull Used SF6 gas even after internal arcing can be effectively filtered for recycling

bull Mitsubishi Electric Power Products circuit breakers are designed manufactured and factory tested to be free of leaks

bull If leaks develop while in service appropriate action to locate and eliminate the leaks should be taken

Material Safety Data SheetFor additional information concerning the composition and characteristics of sulfur hexafluoride gas review the product safety sheet supplied by the manufacturer of the SF6 gas

Pole Unitbull Each pole unit consists of a SF6 gas filled enclosure (Main Enclosure)

which contains the interrupter assembly supported by insulators at each end of the interrupter

bull Two porcelain bushing assemblies extend from the top of the main enclosure Conductors inside the bushings connect the interrupter assembly inside the metal main enclosures to the overhead line

bull The SF6 gas in the pole unit is common to the metal main enclosure and the porcelain bushings

bull An inspection cover is located at the end of the main enclosure to inspect and maintain the interrupters

bull An absorbent assembly is located on the inside of the inspection cover to maintain the dry atmosphere required inside the SF6 gas equipment

bull The rupture disc () is provided only when specifiedbull The SF6 gas is sealed in the main enclosure by O-

rings at each end of the enclosure O-rings in the slide seal assembly through which the operating rod passes and O-rings in the bushing assemblies

• Sulfur Hexafluoride (SF6) Gas Handling
• Slide 2
• Slide 3
• Slide 4
• Slide 5
• Slide 6
• Slide 7
• Slide 8
• Slide 9
• Slide 10
• Slide 11

10486201048620104862010486201048620WARNINGbull Do not allow the temperature of the SF6 cylinders either in

processing as above or in storage to exceed 517degC (125degF)bull Excessive temperature can result in overpressure and

potential failure of the cylinder

Greenhouse Gasbull SF6 gas has been identified by the Intergovernmental Panel on Climate

Change as a greenhouse gasldquo with the potential to contribute to global warming Therefore SF6 gas should not be deliberately released to the atmosphere

bull The gas handling and leak detection procedures described in this instruction book should be carefully followed to limit the amount of SF6 gas released over the life of the circuit breaker

bull Used SF6 gas even after internal arcing can be effectively filtered for recycling

bull Mitsubishi Electric Power Products circuit breakers are designed manufactured and factory tested to be free of leaks

bull If leaks develop while in service appropriate action to locate and eliminate the leaks should be taken

Material Safety Data SheetFor additional information concerning the composition and characteristics of sulfur hexafluoride gas review the product safety sheet supplied by the manufacturer of the SF6 gas

Pole Unitbull Each pole unit consists of a SF6 gas filled enclosure (Main Enclosure)

which contains the interrupter assembly supported by insulators at each end of the interrupter

bull Two porcelain bushing assemblies extend from the top of the main enclosure Conductors inside the bushings connect the interrupter assembly inside the metal main enclosures to the overhead line

bull The SF6 gas in the pole unit is common to the metal main enclosure and the porcelain bushings

bull An inspection cover is located at the end of the main enclosure to inspect and maintain the interrupters

bull An absorbent assembly is located on the inside of the inspection cover to maintain the dry atmosphere required inside the SF6 gas equipment

bull The rupture disc () is provided only when specifiedbull The SF6 gas is sealed in the main enclosure by O-

rings at each end of the enclosure O-rings in the slide seal assembly through which the operating rod passes and O-rings in the bushing assemblies

• Sulfur Hexafluoride (SF6) Gas Handling
• Slide 2
• Slide 3
• Slide 4
• Slide 5
• Slide 6
• Slide 7
• Slide 8
• Slide 9
• Slide 10
• Slide 11

Material Safety Data SheetFor additional information concerning the composition and characteristics of sulfur hexafluoride gas review the product safety sheet supplied by the manufacturer of the SF6 gas

Pole Unitbull Each pole unit consists of a SF6 gas filled enclosure (Main Enclosure)

which contains the interrupter assembly supported by insulators at each end of the interrupter

bull Two porcelain bushing assemblies extend from the top of the main enclosure Conductors inside the bushings connect the interrupter assembly inside the metal main enclosures to the overhead line

bull The SF6 gas in the pole unit is common to the metal main enclosure and the porcelain bushings

bull An inspection cover is located at the end of the main enclosure to inspect and maintain the interrupters

bull An absorbent assembly is located on the inside of the inspection cover to maintain the dry atmosphere required inside the SF6 gas equipment

bull The rupture disc () is provided only when specifiedbull The SF6 gas is sealed in the main enclosure by O-

rings at each end of the enclosure O-rings in the slide seal assembly through which the operating rod passes and O-rings in the bushing assemblies

• Sulfur Hexafluoride (SF6) Gas Handling
• Slide 2
• Slide 3
• Slide 4
• Slide 5
• Slide 6
• Slide 7
• Slide 8
• Slide 9
• Slide 10
• Slide 11

bull The SF6 gas in the pole unit is common to the metal main enclosure and the porcelain bushings

bull An inspection cover is located at the end of the main enclosure to inspect and maintain the interrupters

bull An absorbent assembly is located on the inside of the inspection cover to maintain the dry atmosphere required inside the SF6 gas equipment

bull The rupture disc () is provided only when specifiedbull The SF6 gas is sealed in the main enclosure by O-

rings at each end of the enclosure O-rings in the slide seal assembly through which the operating rod passes and O-rings in the bushing assemblies

• Sulfur Hexafluoride (SF6) Gas Handling
• Slide 2
• Slide 3
• Slide 4
• Slide 5
• Slide 6
• Slide 7
• Slide 8
• Slide 9
• Slide 10
• Slide 11