The safest, most reliable Switchgear in the market today

Transcription

1 February 2008 MV Metal-Clad Switchgear The safest, most reliable Switchgear in the market today January 4, 2015 Slide 1

2 Arc-Resistant Standards Introduction Today s Topics What is Arc Flash and the risks it represents Arc-Resistant Switchgear Standards ABB Switchgear Offering Characteristics of SafeGear Arc-Resistant Switchgear Other Safety Features available in Switchgear today January 4, 2015 Slide 2

3 What is an Arc Flash? The result of a rapid release of energy due to an arcing fault between phases, neutral or a ground. An arc arises when at least part of the current passes through a dielectric, usually air Maximum peak power up to 40 MW Arc temperature up to five times the surface temperature of the sun (20,000 C) Light intensity more than 2000 times that of normal office light Volumetric expansion approximately 40, Temperature of the sun surface is about 5000 C. January 4, 2015 Slide 3

4 Arcing Incidents Do Happen Fault characteristics An arc arises when at least part of the current passes through a dielectric, usually air Maximum peak power up to 40 MW Arc temperature up to five times the surface temperature of the sun ( C) Light intensity more than 2000 times that of normal office light January 4, 2015 Slide 4

5 Arc Flash Danger Statistics Currently, OSHA lumps Arc Flash incidents in with electrical incidents. A recent survey showed that 5-10 people per day go to burn centers due to arc flash incidents that does not include those going to local and regional hospitals That is people a year in the US! With the high mortality rate of burn injuries, this can translate to hundreds of deaths a year IEEE did a study with a large utility and over the last 53 years, they have had 1 arc flash incident every 18 months. January 4, 2015 Slide 5

6 Arcing Incidents Do Happen Security Video of Arc flash incident Distributed by NFPA January 4, 2015 Slide 6

7 Arc-Resistant Switchgear Causes of internal arc faults Improper maintenance, mechanical, and interlock failures Failure to follow procedures Gradual component or insulation breakdown Foreign objects, rodents, snakes, etc. Effects of an internal arc fault Pressure increase in an enclosed compartment Function of arc voltage, current, number, and duration of arcs, volume Rapid onset (10-15 ms) results in explosive forces Thermal effects, hot gases Catastrophic to nearby personnel and equipment January 4, 2015 Slide 7

8 Evolution of Arc-Resistant Standards Interest in Europe uninsulated bus was common Annex AA to IEC 298 was approved in 1981 EEMAC G14-1 was published in 1987 in Canada Type A arc-resistant construction at the front only Type B arc-resistant construction at the front, back, and sides Type C arc-resistant construction at the front, back, and sides, and between compartments IEEE C includes Type 1 similar to EEMAC Type A above Type 2 similar to EEMAC Type B above Annex A addresses suffixes B and C Type 1C Type 1, but also with arc-resistance designs or features between adjacent compartments Type 2B Type 2 with LV instrument compartment door open relay and maintenance personnel survive Type 2C Type 2 with arc-resistance features between adjacent compartments switchgear survives with minimum damage Type 2BC The ultimate in protection combines types 2B and 2C January 4, 2015 Slide 8

9 Industry Recognized Arc-Resistant Standards OSHA 29 Code of Federal Regulations (CFR) Part 1910, Subpart S NFPA 70E-2004, Standard for Electrical Safety in the Workplace IEEE , Guide for Arc Flash Hazard Analysis IEEE C , IEEE Guide for Testing Medium-Voltage Metal-Enclosed Switchgear for Internal Arcing Faults January 4, 2015 Slide 9

10 Arc-Resistant Standards Current Requirements and How They Apply OSHA 29 Code of Federal Regulations (CFR) Part 1910, Subpart S Safe practices to prevent electrical shock or burns must be implemented Mandates that exposed workers must be qualified Requires provisions for the appropriate personnel protective equipment (PPE) NFPA 70E-2004, Standard for Electrical Safety in the Workplace Details steps to comply with the OSHA requirements Worker training Appropriate, safe tools Safety program Arc flash hazard calculations PPE Equipment warning labels January 4, 2015 Slide 10

11 THE NEW NFPA 70E 2009, TABLE (C) (9) Arc-Resistant SWITCHGEAR TYPE 1 OR 2 Hazard/Risk Category for Arc-Resistant Switchgear Insertion or removal of CBs from cubicles, doors open 4 CB operation with enclosure door closed 0 Insertion of removal of CBs from cubicles, doors closed 0 Insertion or removal of ground and test device with door closed 0 Insertion or removal (racking) of voltage transformers on or off the bus, door closed Work on control circuits with energized electrical conductors and circuit parts 120V, exposed 0 2 Applies to clearing times of <0.5 sec with a perspective fault current not to exceed the arcresistant rating of the equipment. January 4, 2015 Slide 11

12 Arc Flash Introduction - Mitigation Techniques Redirecting energy away from workers Reducing the arcing current (En ~Ia) Not effective method as test data is required for current limiting devices (fuses) Increasing the working distance (E~1/D) Using remore racking device, remote operating devices incident energy might be reduced Reducing the clearing time (E~t) Zone selective interlocking slow (100ms) + breaker operate time) can not be used for retrofit installations Bus bar protection expensive to install due to number of CT s Light Detection January 4, 2015 Slide 12

13 ANSI C Accessibility Types 1 Front only 1C 2 Front plus between compartments within a section or between adjacent vertical sections (except main bus compartment) Front, back, and sides 2B Isolation of the Low Voltage Compartment with the instrument door open 2C Front, back, and sides, plus between compartments within a section or between adjacent vertical sections (except main bus compartment) 2BC Offers compartment to compartment and low voltage isolation. Offers the very best solution for personnel protection and system reliability. January 4, 2015 Slide 13 SafeGear meets IEEE C Type 2, 2B, 2C and 2BC!

14 Arc Faults Conventional Switchgear SafeGear January 4, 2015 Slide 14

15 Pressure Buildup vent flap opens enclosure rupture conventional PSI SafeGear time (ms) Pressure measurements Successful SafeGear test January 4, 2015 Slide 15

16 Introduction to ABB ANSI Switchgear 5 to 15 kv metal clad switchgear Advance Traditional non-arc-resistant switchgear SafeGear Meets ANSI Standard C for arc-resistance Four versions Types 2, 2B, 2C and 2BC available Vacuum circuit breakers AMVAC Magnetically actuated mechanism ADVAC Spring operated mechanism January 4, 2015 Slide 16

17 Ratings Ratings Nominal Voltage BIL (kv) Continuous Current (A) Main Bus Forced Air Cooled* Short Circuit (ka) K Factor = January 4, 2015 Slide A rating available for Advance only.

18 ABB Metal-Clad Switchgear Features Galvanic construction Hem bending Modular design Bolted frame Instrument compartment Breaker compartment Bus and cable compartment Potential transformer compartment Arc-resistant switchgear SafeGear Power distribution center Plenum Circuit breaker technology ADVAC AMVAC magnetically actuated circuit breaker option January 4, 2015 Slide 18

19 Galvanic Construction Resistant to rust, corrosion and scratches No paint required Highly reflective (Side view with covers removed) January 4, 2015 Slide 19

20 Hem Bending No sharp edges for increased safety Improved rigidity Reduces arc propagation Forms a self-supporting structure Hem b ending creates a rigid structure and sturdy construction in metal-clad switchgear (reinforced, arc-resistant door construction shown). January 4, 2015 Slide 20

21 Modular Design Bolted construction enables faster replacement and modification in the field Allows for easy replacements, repairs, and specialized configurations Maintains the smallest, compact product January 4, 2015 Slide 21

22 Instrument Compartment Total isolation from medium voltage components No instruments on breaker door Galvanic interiors provide superior reflectivity inside compartments Available in four sizes 19, 38, 57, 95 Gasketed door Easy accessibility for operators Truck operated cell switches located in the low voltage compartment for easy access and to minimize exposure January 4, 2015 Slide 22

23 Breaker Compartment Dual safety shutter actuators Interlock prevents manual operation Mechanically forced by breaker movement Shutters grounded by cable Clear Lexan shutters available Position indicator Connected Test Disconnected January 4, 2015 Slide 23

24 Breaker Compartment Automatic secondary disconnect Provides improved safety for workers while operating the breakers when using SafeGear Single or double plug secondary contacts Grounding contact Interference block Prevents installing undersized breakers January 4, 2015 Slide 24

25 Bus & Cable Compartments Copper bus Epoxy coated bus insulation system No sleeve insulation Silver plating standard Tin plating available Porcelain or glass polyester standoff insulators Molded vinyl boots with re-useable hardware Catalog number embossed on each boot to make reordering easy No tape used January 4, 2015 Slide 25

26 PT Compartments One to three potential transformers (PTs) In SafeGear, less than 40kA duty is 19 inches high. 40kA and 50kA duty is 38 inches high Closed door racking in and out adds element of safety Drawout construction with extension rails makes the compartment easily accessible Lift truck not required to replace fuses Delrin snuffer contact technology January 4, 2015 Slide 26

27 CPT Compartments 15 kva, single-phase, truck mounted Larger size CPT s are fixed mounted in the rear compartment Fuse truck with fixed mounted CPT Closed door racking adds element of safety Drawout construction with extension rails makes the compartment easily accessible for fuse replacement. Compartment is 38 inches high Lift truck not required to replace fuses Delrin snuffer contact technology January 4, 2015 Slide 27

28 Arrangements January 4, 2015 Slide 28

29 SafeGear Arc-Resistant Switchgear Enhanced safety for personnel and equipment Flap/vent system to relieve pressure Patented collection chamber Gases are safely expelled out the roof through the plenum Built to EEMAC G type B and C construction and IEEE C Types 2, 2B, 2C and 2BC More than 25 years experience in arcresistant switchgear Design allows for flexibility in configurations and promotes superior safety performance Certified by an independent test lab January 4, 2015 Slide 29

30 SafeGear Demonstration January 4, 2015 Slide 30

31 Location of Flaps and Vents in SafeGear ONE-HIGH 1200A 1200A W/2 VT UNITS TWO-HIGH 1200A January 4, 2015 Slide A W/FUSED CPT 2000A W/1 VT UNIT ONE-HIGH 3000A

32 SafeGear Patented Internal Collection Chamber January 4, 2015 Slide 32

33 SafeGear Construction Breaker doors secured with heavy duty hinges and bolts Multi-point handle and latching available Double thickness of steel Gasketed construction Seals gases inside Lexan arc-resistant window largest in industry allows the operator to check position and status of circuit breaker without opening the cell door January 4, 2015 Slide 33

34 Plenum Benefits Channels gases out of PDC Provides room for flap operation Allows gases to expand Protects cable trays Maintains weather protection Allows lower building height Plenum PDC ceiling Two-high SafeGear PDC Aisle January 4, 2015 Slide 34

35 Plenum Design Sealed duct across top of switchgear, covering all vent flaps Sized and shaped to minimize turbulence and back-pressure Allows room for cable trays and conduit entry Channels gases safely out of building, through wall penetration and vent January 4, 2015 Slide 35

36 Plenum End Flap Flaps normally closed Opens with pressure in case of arc fault January 4, 2015 Slide 36

37 Circuit Breaker Closed door racking to all positions adds element of safety Three position breaker Positive stop in all positions Breaker positively latched in the compartment (Disconnect) Racking mechanism is integral to the breaker element Auxiliary switches are breaker-mounted and wired out through the secondary disconnect, eliminating the need for separately mounted mechanism operated cell switches Front access mechanism Centered racking mechanism for easy alignment Embedded pole design January 4, 2015 Slide 37

38 ADVAC Circuit Breaker Manual open and close push buttons Manual spring charge port Non-re-settable operations counter Spring charge status indicator Open/close indicator Cell locking tabs and handles Racking release lever Racking access port Racking padlock provision for lockout and safety procedures January 4, 2015 Slide 38

39 ADVAC Circuit Breaker Simple, front-accessible operating mechanism and control components Close & trip coils On-board auxiliary contacts eliminate the need for cellmounted MOC switches and related mechanical linkages 4a, 4b standard 9a, 8b optional Auxiliary switch operating shaft Main drive shaft Precision cam Charging motor Toroidal spring January 4, 2015 Slide 39

40 AMVAC Circuit Breaker Operating mechanism rated for 100,000 operations 10 times ANSI requirement Interrupter assemblies rated for 30,000 full load operations Virtually maintenance free (minor lubrication needed) Only seven moving parts 90% less parts Permanent magnet for holding force and latch Dual capacitors store energy Full operation for up to 90 seconds after loss of control power Interchangeable with ADVAC January 4, 2015 Slide 40

41 AMVAC Circuit Breaker 1. Upper Primary Terminal 2. Vacuum Interrupter 3. Epoxy Potting Compound 4. Lower Primary Terminal 5. Flexible Connector 6. Wipe Springs 7. Insulated Pushrod 8. Jackshaft 9. Stroke Adjustment 10. Position Sensors 11. Close Coil 12. Permanent Magnets 13. Armature 14. Open Coil 15. Manual Opening Actuator 16. Mechanism Enclosure January 4, 2015 Slide 41

42 AMVAC Circuit Breaker Manual opening mechanism Magnetic actuator Auxiliary contacts Electronic controller Electrical energy storage Sensor for switching position detection January 4, 2015 Slide 42

43 AMVAC vs. ADVAC AMVAC s simple design reduces moving elements and the need for spare parts January 4, 2015 Slide 43

44 Accessories Racking crank, manual close bar Test cabinet Test jumper Ground & test device Electric racking device Lift truck Ramp Shutter actuator truck Breaker release handle Wear test device Dummy circuit breakers Slow close device IR Viewing Ports January 4, 2015 Slide 44

45 Arc Flash Mitigation Relays REA 101 Arc Protection Relay Fast trip time (< 2.5 ms) Unique fiber optic sensor technology with self supervision Current supervision for secure and reliable arc detection Easy to configure via front mounted dip switches Suitable for existing LV / MV switchgear installations or new applications Minimize potential risk of injury or death while increasing reliability Includes standard 12 year warranty January 4, 2015 Slide 45

46 REA Application Example #1 Arc in the right bus compartment with the tie breaker open REA 101 REA 101 Right REA 101 detects light Right REA 101 detects overcurrent REA 101s send the current information to all connected units Right bus is disconnected REA 105 REA 105 REA 105 REA 105 January 4, 2015 Slide 46

47 IR viewing Ports SAFE: Successfully Arc-Flash tested in accordance with IEEE C RUDGGED: Certified by UL, SIRA and Lloyds of London for installation into both indoor and outdoor equipment FLEXIBLE: Broadband optic suitable for all IR cameras. SECURE: Unique mounting system allows for safe, single person installation & retro-fitting with No dangerous internal fasteners required. 1. Eliminate need to enter the switchgear while energized. 2. Frequent monitoring possible without impacting production. 3. Easy to use system requires little training January 4, 2015 Slide 47

48 Product description Indicator of voltage presence installed directly on bus bars, conductors etc. January 4, 2015 Slide 48 Advantages of VisiVolt Applicable to any unshielded medium voltage system from 3 kv to 36 kv For permanent installation information on voltage presence available all the time Outdoor and indoor application Good visibility under all lighting conditions Maintenance free; passive device no power supply needed Simple and robust construction resistant to overvoltages (does not use electronic elements) Very compact construction Easy to install Economical solution

49 In Summary Advance & SafeGear available at 5 and 15kV SafeGear arc-resistant switchgear Types 2, 2B, 2C and 2BC provide the highest level of personnel protection AMVAC breaker 100,000 mechanical operations mechanism 30,000 load break operations interrupter Virtually maintenance free REA Relays Protects you personnel and equipment with the most advanced arc flash mitigation relays on the market. January 4, 2015 Slide 49

50 January 4, 2015 Slide 50