8
INDOOR MEDIUM VOLTAGE SWITCHGEAR - UP TO 24kV A division of ACTOM Pty Ltd

ACTOM INDOOR MEDIUM VOLTAGE · PDF fileEastern Electricity Board 11kV circuit breaker are available higher ... ACTOM Indoor Medium Voltage Switchgear ... Internal arc testing of MV

  • Upload
    buimien

  • View
    258

  • Download
    2

Embed Size (px)

Citation preview

Page 1: ACTOM INDOOR MEDIUM VOLTAGE · PDF fileEastern Electricity Board 11kV circuit breaker are available higher ... ACTOM Indoor Medium Voltage Switchgear ... Internal arc testing of MV

www.actom.co.za

Tel: +27 (0)11 820-5111

2 Magnet Road

Knights

1413

P O Box 13024

Knights

1413

INDOOR MEDIUM VOLTAGE SWITCHGEAR - UP TO 24kV

Fax: +27 (0)11 820-5122

email: [email protected]

A division of ACTOM Pty Ltd

Page 2: ACTOM INDOOR MEDIUM VOLTAGE · PDF fileEastern Electricity Board 11kV circuit breaker are available higher ... ACTOM Indoor Medium Voltage Switchgear ... Internal arc testing of MV

SBV range of products

Prior to 1980, ACTOM’s indoor vacuum arc switching is the switchgear business centered lowest of all switching media.around J&P designed AG and Of the four switching media (air, Statter designed ACO ranges of bulk oil, SF6 and vacuum), vacuum oil circuit breaker equipment. has by far the best dielectric

recovery properties after short-A requirement for modern tech- circuit interruption. nology switchgear was identified in Vacuum arc switching produces the mid-1970s and in 1976, equip- no adverse environmental pro- ment based on the B-Vac fixed ucts, precluding harmful characpattern vacuum circuit breaker was teristics either towards people introduced. This equipment how- or materials.ever, was not well accepted on the Increased safety due to the local market and by 1978 had made absence of oil products in the

that will result from the unlikely no significant inroads into the equipment make-up.event of an internal arc fault – modern technology business. In thus affording inherent operator 1978 it was realised that a more safety. In the case of the dupli-cost-effective range of draw-out The relevant international and cate busbar compartment, pattern switchgear would have to be national type tests applicable to the venting of the lower busbar introduced. At that time no suitable ACTOM range of switchgear have compartment is effected at the designs in GEC distribution been carried out by accredited longitudinal end of the switchswitchgear were available and the testing authorities such as KEMA board.decision that would lead to the and the SABS. Copies of these tests

Vacuum interrupters are employed development of ACTOM’s SBV are available on request. It can be as a switching medium. The advan-range of switchgear was taken. stated that, among SouthAfrican tages of switching in vacuum are m a n u f a c t u r e r s o f i n d o o r considerable. switchgear, ACTOM Switchgear has They include:The SBV equipment was designed been a leader in implementing Small interrupter gaps (as low asto meet virtually all known cus- internal arc testing and actively

6 mm for 12 kV applications) tomer requirements. It includes promotes internal arc testing of result in low-energy mecha-single and double busbar units. switchgear. SBV switchgear has nisms, ensuring long mecha-Integral circuit (cable) earthing is been internally arc tested at 25 kA nism life.offered as an option. Busbar for 200 milliseconds, as per Eskom

Low-peak arc voltages result in earthing via the circuit breaker is requirements.very low arc energy – which in also an available option.SBV turn ensures a long electrical life equipment is designed for horizon-for the vacuum interrupter and a tal isolation and withdrawal, no-maintenance device. In 1965 offering inter alia, the following three outdoor, f ixed-type advantages: This version is available in single or vacuum circuit breakers, fitted Natural venting of the circuit duplicate busbar arrangements. with auto-reclose facilities, were breaker compartments is Circuit and busbar earthing via the installed on Great Britain’s permitted and, subsequently, circuit breaker are available Eastern Electricity Board 11kV higher continuously rated options. The operating mechanism networks to assess their perfor-currents. allows for hand charged spring or mance. Five arduous years of Pressure relief vents, fitted as a motor charged spring application. service were insufficient to standard to all equipment, are The mechanism design allows for evaluate the contact wear and accommodated at the top of the the following optional features: loss of vacuum integrity, as none circuit breaker panels. The second shunt trip facility could be detected.purpose of the relief vents is to under voltage (no-volt) trip The current chopping level ofopen and relieve over-pressure facility

Tests

SBV vacuum switchgear

TYPES OF SWITCHGEAR

Type SBV 3 & SBV 3E

•••

2

ACTOM Indoor Medium Voltage Switchgear

Freestanding SBV 5 capacitor feeders.

7

Notes

Page 3: ACTOM INDOOR MEDIUM VOLTAGE · PDF fileEastern Electricity Board 11kV circuit breaker are available higher ... ACTOM Indoor Medium Voltage Switchgear ... Internal arc testing of MV

36

Page 4: ACTOM INDOOR MEDIUM VOLTAGE · PDF fileEastern Electricity Board 11kV circuit breaker are available higher ... ACTOM Indoor Medium Voltage Switchgear ... Internal arc testing of MV

4 5

• •

Rating characteristicsRating characteristics••

••

••

••

Type SBV-CType SBV4 & SBV4E

••

Rating characteristicsRating characteristics••

••

Rating characteristics••

•••

Type SBV24Type SBV5 & SBV5E •

configuration. Circuit and busbar earthing via the circuit breaker are available options. The operating mechanism allows for hand charged spring or motor charged spring application. The mechanism design allows for the provision of the following features:

second shunt trip facility under voltage (no-volt) trip facility

direct acting (series) trip facility.

designed for utilisation in the low- Rated voltage: up to and profile SBV4 housings and is Rated voltage: up to and

including 24 kVinterchangeable with the SBV4 including 12 kV Rated normal current: up to and circuit breaker and vacuum Rated normal current: up to and

including 1 250 Acontactors. Circuit and busbar including 2 500 A Rated short circuit capability: up earthing via the circuit breaker are Rated short circuit capability:

to and including 25 kA for available options. The operating up to and including 40 kA for 3 seconds.mechanism is of the magnetic 3 seconds

BIL: 125 kVactuator type, using closing and BIL: 95 kVtripping coils with the plunger being held magnetically in the closed or

These are fused vacuum contactorsopen positions by permanent The SBV4 equipment is available in m o u n t e d o n w i t h d r a wa b l e magnets. The material used for the single busbar configuration only Carriages and are extensible on magnets is neodymium-iron-boron,and is of low-profile construction, SBV3 and SBV4 switchgear. A the field strength of which is almost permitting overall height reduction manually operated “cable” dis-twice that of samarium cobalt and of the switchgear. Circuit and charge switch is an available option. up to 280 times that of steel. The busbar earthing via the circuit Operating mechanisms are electri-circuit breaker has been type tested breaker are available options. The cally “held” or mechanically in excess of 100 000 no-load operating mechanism allows for latched options. Mechanical life of mechanical operations without hand charged spring or motor the vacuum contactors is in excess discernable component wear. The charged spring application. The of 3 x 106 operations; electrical combination of magnetic actuators mechanism design allows for theendurance in excess of 106 opera-with long-life vacuum interrupters provision of the following optionaltions. Fused contactors have an has resulted in circuit breaker life features:advantage over circuit breakers in that was previously not possible. second shunt trip facility that the fuses greatly limit the Further features include a low under voltage (no-volt) tripmagnitude and duration of short-component count, reliability and facilitycircuit currents. Where the equip-minimal maintenance. direct acting (series) trip facility ment is used in switching of motors, cables can be sized to carry load and starting currents only. Possible fault Rated voltage: up to and Rated voltage: up to and damage to motors can thus be including 12 kV including 12 kV restricted. Rated normal current: up to and Rated normal current: up to and

including 1 250 A including 2 000 A Rated short circuit capability: up Rated short circuit capability:

(of contactor unit only)to and including 25 kA for up to and including 31,5 kA for 3 Rated voltage: up to and 3 secondsseconds

including 12 kV BIL: 95 kV BIL: 95 kVRated normal current: up to and including 400 ARated short circuit capability: This version is for 22 kV indoor The SBV 5 circuit breaker was 4kAutilisation and is of single busbar

A major hazard of electrical medium the case of segregated phase they start burning, the assessment voltage installations is the danger of conductors, between one phase criterion may be regarded as having an internal arc fault. The most and earth. All the relevant compart- been met if proof is established that common causes of an internal arc ments must be individually tested the ignition was caused by glowing fault are tools left on the busbars to ensure the integrity of the com- particles rather that hot gases. after the initial installation or during plete switch panel, not just one Highspeed camera pictures should maintenance, and binding wire particular section. For the effects of be produced in evidence.used during commissioning tests, the explosion to be monitored 6 – Whether all the earthing connec-not having been removed prior to under actual conditions, two walls, tions are still effective.energising. An internal arc condi- a ceiling and the floor are required It is advisable to record the tests intion constitutes a potentially to be simulated. As operator safety a high-speed video of up to 1 000dangerous situation for the opera- is of prime importance, indicators frames per second in order to tor. are positioned both horizontally and analyse the physical phenomena.

vertically in metal racks 300 mm The ever increasing safety needs Internal arc testing requirements from the switchgear being tested. call for switchgear manufacturers to were initiated by the German The above indicators are positioned comply with international and PHELA organisation. A procedure front and sides, facing all the points national standards.for internal arc testing was then where gas is likely to be emitted, developed, resulting in Appendix and positioned in such a way that “A” of the IEC 60298 standard. hot gas escaping in slant directions

can be monitored. The design of the SBV range ofArc duration of 0,1 second is vacuum switchgear commenced inconsidered sufficient to prove the These indicators consist of metal 1978. Even at that early stage the operation of pressure relief devices. frames covered with black cretonne importance of internal arc fault Internal arc faults are normally cloth of 150 g/m². venting and safety was recognised.simulated by a thin copper wire of The design of the horizontal approximately 0,5 mm in diameter To successfully complete the withdrawable switchgear was stretched across two or more internal arc tests the equipment chosen so as to incorporate top p h a s e s i n s i d e t h e v a r i o u s needs to meet the criteria set out in venting. Following ACTOM’s switchgear compartments, and in IEC 60298 Appendix “A” as repeated success at KEMA in 1997 when the

below: SBV4 was successfully internal arc 1 – Whether correctly secured doors, fault tested for 20 kA at 12 kV for 0,1 covers, etc, do not open. second, more onerous tests were 2 – Whether parts (of the metal- carried out at the SABS high power enclosed switchgear and control laboratory. The tests provided for gear), which may cause a hazard, do side access in addition to front not fly off - including large parts or access and the internal arc was for those with sharp edges, e. g. 25 kA with a duration of 0,2 sec.inspection windows, pressure relief flaps, cover plates, etc, made of metal or plastic.3 – Whether arcing does not cause The introduction of IEC 62271-200holes to develop in the accessible and internal arc classification (IAC)external parts of the enclosure as a lead to ACTOM enhancing its result of burning or other effects. proven SBV range of circuit break-4 – Whether the indicators arranged ers (i.e. SBVE). The SBVE range is vertically do not ignite. Indicators presently classified as BFL-AR 25 kA that ignite as a result of paint or 0.2 sec in accordance with IEC stickers burning are excluded from 62271-200. Development and this assessment. testing with SBVE is ongoing, 5 – Whether the indicators arranged ensuring safer and more reliable horizontally do not ignite. Should products.

Internal arc fault testing in accordance with IEC 60298

Internal arc classification in accordance with IEC 62271-200

Internal arc testing of MV switchgear

Medium voltage switchboard undergoing preparations for acceptance testing.

SBV3 double busbar switchpanel afterinternal arc test.

Page 5: ACTOM INDOOR MEDIUM VOLTAGE · PDF fileEastern Electricity Board 11kV circuit breaker are available higher ... ACTOM Indoor Medium Voltage Switchgear ... Internal arc testing of MV

4 5

• •

Rating characteristicsRating characteristics••

••

••

••

Type SBV-CType SBV4 & SBV4E

••

Rating characteristicsRating characteristics••

••

Rating characteristics••

•••

Type SBV24Type SBV5 & SBV5E •

configuration. Circuit and busbar earthing via the circuit breaker are available options. The operating mechanism allows for hand charged spring or motor charged spring application. The mechanism design allows for the provision of the following features:

second shunt trip facility under voltage (no-volt) trip facility

direct acting (series) trip facility.

designed for utilisation in the low- Rated voltage: up to and profile SBV4 housings and is Rated voltage: up to and

including 24 kVinterchangeable with the SBV4 including 12 kV Rated normal current: up to and circuit breaker and vacuum Rated normal current: up to and

including 1 250 Acontactors. Circuit and busbar including 2 500 A Rated short circuit capability: up earthing via the circuit breaker are Rated short circuit capability:

to and including 25 kA for available options. The operating up to and including 40 kA for 3 seconds.mechanism is of the magnetic 3 seconds

BIL: 125 kVactuator type, using closing and BIL: 95 kVtripping coils with the plunger being held magnetically in the closed or

These are fused vacuum contactorsopen positions by permanent The SBV4 equipment is available in m o u n t e d o n w i t h d r a wa b l e magnets. The material used for the single busbar configuration only Carriages and are extensible on magnets is neodymium-iron-boron,and is of low-profile construction, SBV3 and SBV4 switchgear. A the field strength of which is almost permitting overall height reduction manually operated “cable” dis-twice that of samarium cobalt and of the switchgear. Circuit and charge switch is an available option. up to 280 times that of steel. The busbar earthing via the circuit Operating mechanisms are electri-circuit breaker has been type tested breaker are available options. The cally “held” or mechanically in excess of 100 000 no-load operating mechanism allows for latched options. Mechanical life of mechanical operations without hand charged spring or motor the vacuum contactors is in excess discernable component wear. The charged spring application. The of 3 x 106 operations; electrical combination of magnetic actuators mechanism design allows for theendurance in excess of 106 opera-with long-life vacuum interrupters provision of the following optionaltions. Fused contactors have an has resulted in circuit breaker life features:advantage over circuit breakers in that was previously not possible. second shunt trip facility that the fuses greatly limit the Further features include a low under voltage (no-volt) tripmagnitude and duration of short-component count, reliability and facilitycircuit currents. Where the equip-minimal maintenance. direct acting (series) trip facility ment is used in switching of motors, cables can be sized to carry load and starting currents only. Possible fault Rated voltage: up to and Rated voltage: up to and damage to motors can thus be including 12 kV including 12 kV restricted. Rated normal current: up to and Rated normal current: up to and

including 1 250 A including 2 000 A Rated short circuit capability: up Rated short circuit capability:

(of contactor unit only)to and including 25 kA for up to and including 31,5 kA for 3 Rated voltage: up to and 3 secondsseconds

including 12 kV BIL: 95 kV BIL: 95 kVRated normal current: up to and including 400 ARated short circuit capability: This version is for 22 kV indoor The SBV 5 circuit breaker was 4kAutilisation and is of single busbar

A major hazard of electrical medium the case of segregated phase they start burning, the assessment voltage installations is the danger of conductors, between one phase criterion may be regarded as having an internal arc fault. The most and earth. All the relevant compart- been met if proof is established that common causes of an internal arc ments must be individually tested the ignition was caused by glowing fault are tools left on the busbars to ensure the integrity of the com- particles rather that hot gases. after the initial installation or during plete switch panel, not just one Highspeed camera pictures should maintenance, and binding wire particular section. For the effects of be produced in evidence.used during commissioning tests, the explosion to be monitored 6 – Whether all the earthing connec-not having been removed prior to under actual conditions, two walls, tions are still effective.energising. An internal arc condi- a ceiling and the floor are required It is advisable to record the tests intion constitutes a potentially to be simulated. As operator safety a high-speed video of up to 1 000dangerous situation for the opera- is of prime importance, indicators frames per second in order to tor. are positioned both horizontally and analyse the physical phenomena.

vertically in metal racks 300 mm The ever increasing safety needs Internal arc testing requirements from the switchgear being tested. call for switchgear manufacturers to were initiated by the German The above indicators are positioned comply with international and PHELA organisation. A procedure front and sides, facing all the points national standards.for internal arc testing was then where gas is likely to be emitted, developed, resulting in Appendix and positioned in such a way that “A” of the IEC 60298 standard. hot gas escaping in slant directions

can be monitored. The design of the SBV range ofArc duration of 0,1 second is vacuum switchgear commenced inconsidered sufficient to prove the These indicators consist of metal 1978. Even at that early stage the operation of pressure relief devices. frames covered with black cretonne importance of internal arc fault Internal arc faults are normally cloth of 150 g/m². venting and safety was recognised.simulated by a thin copper wire of The design of the horizontal approximately 0,5 mm in diameter To successfully complete the withdrawable switchgear was stretched across two or more internal arc tests the equipment chosen so as to incorporate top p h a s e s i n s i d e t h e v a r i o u s needs to meet the criteria set out in venting. Following ACTOM’s switchgear compartments, and in IEC 60298 Appendix “A” as repeated success at KEMA in 1997 when the

below: SBV4 was successfully internal arc 1 – Whether correctly secured doors, fault tested for 20 kA at 12 kV for 0,1 covers, etc, do not open. second, more onerous tests were 2 – Whether parts (of the metal- carried out at the SABS high power enclosed switchgear and control laboratory. The tests provided for gear), which may cause a hazard, do side access in addition to front not fly off - including large parts or access and the internal arc was for those with sharp edges, e. g. 25 kA with a duration of 0,2 sec.inspection windows, pressure relief flaps, cover plates, etc, made of metal or plastic.3 – Whether arcing does not cause The introduction of IEC 62271-200holes to develop in the accessible and internal arc classification (IAC)external parts of the enclosure as a lead to ACTOM enhancing its result of burning or other effects. proven SBV range of circuit break-4 – Whether the indicators arranged ers (i.e. SBVE). The SBVE range is vertically do not ignite. Indicators presently classified as BFL-AR 25 kA that ignite as a result of paint or 0.2 sec in accordance with IEC stickers burning are excluded from 62271-200. Development and this assessment. testing with SBVE is ongoing, 5 – Whether the indicators arranged ensuring safer and more reliable horizontally do not ignite. Should products.

Internal arc fault testing in accordance with IEC 60298

Internal arc classification in accordance with IEC 62271-200

Internal arc testing of MV switchgear

Medium voltage switchboard undergoing preparations for acceptance testing.

SBV3 double busbar switchpanel afterinternal arc test.

Page 6: ACTOM INDOOR MEDIUM VOLTAGE · PDF fileEastern Electricity Board 11kV circuit breaker are available higher ... ACTOM Indoor Medium Voltage Switchgear ... Internal arc testing of MV

36

Page 7: ACTOM INDOOR MEDIUM VOLTAGE · PDF fileEastern Electricity Board 11kV circuit breaker are available higher ... ACTOM Indoor Medium Voltage Switchgear ... Internal arc testing of MV

SBV range of products

Prior to 1980, ACTOM’s indoor vacuum arc switching is the switchgear business centered lowest of all switching media.around J&P designed AG and Of the four switching media (air, Statter designed ACO ranges of bulk oil, SF6 and vacuum), vacuum oil circuit breaker equipment. has by far the best dielectric

recovery properties after short-A requirement for modern tech- circuit interruption. nology switchgear was identified in Vacuum arc switching produces the mid-1970s and in 1976, equip- no adverse environmental pro- ment based on the B-Vac fixed ucts, precluding harmful characpattern vacuum circuit breaker was teristics either towards people introduced. This equipment how- or materials.ever, was not well accepted on the Increased safety due to the local market and by 1978 had made absence of oil products in the

that will result from the unlikely no significant inroads into the equipment make-up.event of an internal arc fault – modern technology business. In thus affording inherent operator 1978 it was realised that a more safety. In the case of the dupli-cost-effective range of draw-out The relevant international and cate busbar compartment, pattern switchgear would have to be national type tests applicable to the venting of the lower busbar introduced. At that time no suitable ACTOM range of switchgear have compartment is effected at the designs in GEC distribution been carried out by accredited longitudinal end of the switchswitchgear were available and the testing authorities such as KEMA board.decision that would lead to the and the SABS. Copies of these tests

Vacuum interrupters are employed development of ACTOM’s SBV are available on request. It can be as a switching medium. The advan-range of switchgear was taken. stated that, among SouthAfrican tages of switching in vacuum are m a n u f a c t u r e r s o f i n d o o r considerable. switchgear, ACTOM Switchgear has They include:The SBV equipment was designed been a leader in implementing Small interrupter gaps (as low asto meet virtually all known cus- internal arc testing and actively

6 mm for 12 kV applications) tomer requirements. It includes promotes internal arc testing of result in low-energy mecha-single and double busbar units. switchgear. SBV switchgear has nisms, ensuring long mecha-Integral circuit (cable) earthing is been internally arc tested at 25 kA nism life.offered as an option. Busbar for 200 milliseconds, as per Eskom

Low-peak arc voltages result in earthing via the circuit breaker is requirements.very low arc energy – which in also an available option.SBV turn ensures a long electrical life equipment is designed for horizon-for the vacuum interrupter and a tal isolation and withdrawal, no-maintenance device. In 1965 offering inter alia, the following three outdoor, f ixed-type advantages: This version is available in single or vacuum circuit breakers, fitted Natural venting of the circuit duplicate busbar arrangements. with auto-reclose facilities, were breaker compartments is Circuit and busbar earthing via the installed on Great Britain’s permitted and, subsequently, circuit breaker are available Eastern Electricity Board 11kV higher continuously rated options. The operating mechanism networks to assess their perfor-currents. allows for hand charged spring or mance. Five arduous years of Pressure relief vents, fitted as a motor charged spring application. service were insufficient to standard to all equipment, are The mechanism design allows for evaluate the contact wear and accommodated at the top of the the following optional features: loss of vacuum integrity, as none circuit breaker panels. The second shunt trip facility could be detected.purpose of the relief vents is to under voltage (no-volt) trip The current chopping level ofopen and relieve over-pressure facility

Tests

SBV vacuum switchgear

TYPES OF SWITCHGEAR

Type SBV 3 & SBV 3E

•••

2

ACTOM Indoor Medium Voltage Switchgear

Freestanding SBV 5 capacitor feeders.

7

Notes

Page 8: ACTOM INDOOR MEDIUM VOLTAGE · PDF fileEastern Electricity Board 11kV circuit breaker are available higher ... ACTOM Indoor Medium Voltage Switchgear ... Internal arc testing of MV

www.actom.co.za

Tel: +27 (0)11 820-5111

2 Magnet Road

Knights

1413

P O Box 13024

Knights

1413

INDOOR MEDIUM VOLTAGE SWITCHGEAR - UP TO 24kV

Fax: +27 (0)11 820-5122

email: [email protected]

A division of ACTOM Pty Ltd