busbar trunk

8/3/2019 Busbar Trunk

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Busbar Trunking System


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L&T - Building ElectricalsLarsen & Toubro Limited - India's leading technology-driven engineering and constructionorganization - offers India's widest range of low-tension switchgear. Each product in the switchgear rangecarries the L&T insignia of reliability and accuracy, and is backed by prompt after-sales service. For youroffices, commercial & residential requirements choose from L&Ts complete range of building electricals.

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Air Circuit Breaker

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Building Automation Products Tebis - Home Automation

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Login - Access control

Powerman - Energy Monitoring System

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Energy & MeteringCapacitors

Energy Meters

Final Distribution Products

Busbar Trunking SystemWires

Modular Devices (MCB, ELCB, ELMCB, DB)

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IT/ITES

Hospitals

Assembly lines in factories Airports

Industries

Hotels

Apartments

Areas of Application

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L&T - Megaduct Busbar Trunking System

Busbar trunking system (BBT), performs the function of transporting current form one point to the other. Traditionally cables were used for this function.

BBT goes beyond what cables do. BBT can tap off powerto switchgear for further distribution using tap of boxes.In comparison to cables, BBT can thus serve asdistribution panels at different stages (at floors of abuilding). BBT thus continues as a single systems toreplace cables as well as distribution boards at floor levelfor building (commercial or industrial).

L&T introduces world-class sandwich Busbar TrunkingSystem (BBT) under the brand L&T-Megaduct to itsvalued Indian customers. The BBT is totally enclosed,non-ventilated design busbar and is fully insulated usinghalogen free fire retardant insulation.L&T-MegaductBBT system offer a superior alternative to cables andother bus trunking options through this compact andscalable range of system thus providing an enhancedsolution to power transmission and distribution inbuildings as well as industry.


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3

Busbar trunking system is of two types:

1) Sandwich

2) Air Insulated

Sandwich Busbar trunking system is preferred widely due to its advantages over Air insulated busbars aswell as cables, some of which are mentioned below.

Benefits of Sandwich Construction :

Compactness : Sandwich construction render to the BBT system more compact than airinsulated bus bar system, thus making them a preferred choice in plant roomand building applications.

Energy efficiency : Compactness of sandwich construction results in higher efficiency due to lowervoltage drop and impedance. This ensures all connected equipment run cooler.

Flexible : Additions of floor to a building or any expansion to an existing system isextremely simple with sandwich BBT. They are scalable & elegant.

Safe & Sure : Higher mechanical strength over long runs, better electrical conductivity and

lower mV drop which ensures high reliability. Ability to withstand high shortcircuit currents make them doubly safe.

Fire retardant : Sandwich construction do not have air gap due to which natural progression of fire is inhibited. Insulation being flame retardant provides better resistance tospread of fire.

Economical : Inherently flexible design ensures easy installation and maintenance thusresulting in lower installation and maintenance costs.

Types of Busbar Trunking System


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L&T Megaduct busbar trunking system is of sandwich construction, totally enclosed, well insulateddesign. It is used ( as feeder busbar ) for interconnection between transformer/generator to powerdistribution centers and as plug-in ( busbar risers ) in building power systems. Cast resin busduct arealso available for outdoor application. These busducts are suitable for operation in a 600/1000V system.

42

5

3

1

4

6

Flange End

Straight Busduct

Single Bolt Bridge Joint

Elbow

Tap-off UnitTerminal End Cover

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3

4

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The diagram below familiarises you with L&T-Megaduct busbar trunking system:

L&T - Megaduct Busbar Trunking System


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5

Components of Busbar Trunking System

Flange End is the incoming unit of a busbar trunkingsystem. The power is fed at the flange End to energisethe busbar trunking system. Flange End is providedwith sufficient space for direct cable connections by nutsand bolts. (details can be given on request)

1

2

Feeder type: Straight busbar trunking unit with notap off facility

Flange End

Straight Busduct

These straight bus duct run along the length of connection and the body of the bus trunking system. Types of straight busduct are:

Flange End Box can be provided on request with flangeend for accommodating protective devices like

ACB/MCCB.

Plug in type: Straight busbar trunking unit having tapoff points on one or many faces


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System Voltage :

600V and up to maximum 1000V / 3P / 50 Hz or 60 Hzconstructed in various configurations of 3 phase 3 wireor 3 phase 4 wire with or without 50% integral housingground and separate earth bar. The earth bar (50% or100%) can be installed. To counter excessive harmoniceffects, 200% neutral can also be provided on request.

Current Ratings :

Wide range of current rating from 100A to 6300A forCopper Conductor and upto 5000A for AluminiumConductors.

Insulation : 0 All Busbars have Class H-180 C standard epoxy coating

as insulation material which provides 100% waterproofing and high mechanical strength. Alternately we

0also provide multilayer Class F-155 C insulation. Thesebusducts are designed & tested in accordance with IEC60-439-2 and BS 5486

Benefits of using epoxy coating as insulation :Withstands glitch and spikes in electrical system sothat system is stable & runs reliably

Provides rooms for expansion/contraction duringpeak and off-peak hours to avoid tracking in surfaceof insulation

Capable of withstanding heat shock thus minimisingchances of failure due to spark or excess heat

High mechanical strength so that insulation damageby accidental impact is reduced

High thermal conductivity to provide uniformdistribution of heat, hence system runs cooler

Water and chemical resistant which makes it suitablefor use in corrosive and humid environment

Conductor Neutral

200%

Ingress Protection Indoor Outdoor

Al Cu IP42 IP55 IP66 IP67 100%

Feeder Type

Plug-in Type

Epoxy Insulation

Horizontal / Vertical BusBars :

All L&T Megaduct copper busbars are of highconductivity (IACS 99.98%) copper bar with high purity(>99.95%), or aluminum bars with conductivity >61%.

All copper busbars are tin or silver plated and fullyinsulated.

The busbars are tropicalised to withstand higher0 0temperature rise of 50 C- 55 C.

Standard lengths of 3M / 2M / 1M up to 0.45M. Otherlengths will be made available as required.

Housing :

L&T Megaduct Busbar Trunking have a rugged housingprofile and provide the most efficient way to dissipateheat through conduction and natural convection. Allhousings are constructed from 1.6mm electro-

galvanized steel sheet coated with oven baked polyesterpowder paint or epoxy coated powder which alsoprovides maximum mechanical strength againstelectromagnetic stresses.


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The straight bus ducts are expected to carry their fullrated current for required lengths and in order toovercome extreme rugged conditions at site, the newL&T Megaduct joint has been designed precisely andmanufactured using the highest quality of materials to

minimize all possible problems and enhance systemperformance.

Benefits of Single Bolt Bridge Joint:

Incorporates a 5mm thermal expansion andmovement at every joint

Allows 15mm of lateral adjustment (total 30mm) tocorrect site measurement inaccuracies

Ability to tilt at an angle of 5 (total 10 > alongsingle axis)

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6

4

3

2

1

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5Disc Spring

Joint Backing Plate

Joint End Insulator (DMC)

Joint Copper Bar 4.5mm

Joint Phase Insulator (DMC)

Nylon Locknut

Fiber Tube

Joint Bolt (Single/Double Headed)

Single Bolt Bridge Joints

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Longer overlapping length (>40 mm) to increasecontact area

Single bolt bridge joint system

Bolts and nuts can be stainless steel, galvanized or

chromed black High Tensile SteelEntire System is designed and tested for protection of IP42 / IP55 / IP 66 / IP 67

Easy to remove / install joints without removing themain busduct

Water / Chemical Resistant DMC / SMC / BMC insulationPlates

Optional shear off twin headed bolts to required torqueof 70Nm


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Busbar Trunking elbows are angle units which enablethe Busbar Trunking system to change directions.

Various types of elbows can be provided as percustomers requirement. Like,

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Tap-Off Units are required to tap power from the straight circuit breakers (MCCB) or SDFs of various currentbus ducts. Typically, Tap-Off units are used in plug in ratings. Generally, 2 tap-off units per side are installed.type busbar trunking systems ( vertical risers ). TOUs Provision of up to five tap-off units per length of 3Mare installed at specified intervals for tapping power from busduct can be given depending upon the size of MCCBs.a bus trunking system. TOU is provided with non-fused

Elbow

Tap-Off Units (TOU)

Flatwise Elbow (Horizontal Elbow)

Edgewise Elbow (Vertical Elbow)

Edgewise offset ( Double Elbow)

Combination Elbow (Combines Vertical & Horizontal)


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Features of Tap-Off Units:

All Tap-Off units can be interlocked to prevent removalwhen outgoing device is in ON position

When the tap-off unit cover is OPEN, it is interlockedsuch that MCCB cannot be turned ON

Tap-Off units are suitable for all types of MCCBs ie.3 pole / 4 pole of ratings from 16A to 1600A

Tap-Off units can also be used with MCBs and FuseSwitch BreakerMetering facility can be provided on request

Bolt-on type plug-in units is available for MCCBratings >600A

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Component for sealing the last bus bar trunking unit inthe system. Typically, one such end cover would be

required for termination of one run of the system.

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Required for spacing Busbar Trunking Systemhorizontally and vertically.

Horizontal hanger supports are required for Horizontalinstallations and Vertical rigid/ spring supports forvertical installations.

Terminal End Cover Supports

Plug in outlet Self interlocking clamp

Guide port

Guide clamp


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10

Aluminium Conductor

Copper Conductor

ConcentratedRated

Current

Bus BarDimensions

(w x h)in mm

No.of

Stacks

1 0.8 0.6 0.4 0.2 0

Impedancemicro-ohm

per metre at95 degree celcius

R X Z

Wt.(kg/m)

3P4W1/2E

(AMP)

Technical Data

Cross-Section Area

2(mm )

100

200

300400

630

800

1000

1250

1600

2000

2500

3200

4000

5000

ConcentratedRated

Current

(AMP)

100

200300

400

630

800

1000

1250

1600

2000

2500

3200

40005000

6300

150 x 74

150 x 74

150 x 74150 x 74

150 x 84

150 x 109

150 x 134

150 x 159

150 x 184

150 x 234

150 x 318

150 x 368

150 x 552

150 x 702

Bus BarDimensions

(w x h)in mm

150 x 54

150 x 59150 x 74

150 x 59

150 x 74

150 x 84

150 x 109

150 x 134

150 x 159

150 x 184

150 x 234

150 x 318

150 x 477150 x 552

150 x 702

1

1

11

1

1

1

1

1

1

2

2

3

3

No.of

Stacks

1

11

1

1

1

1

1

1

1

1

2

33

3

120

120

240240

300

450

600

750

900

1200

1500

1800

2700

3600

Cross-Section Area

2(mm )

60

75120

150

240

300

450

600

750

900

1200

1500

22502700

3600

14

14

1515

18

19

22

25

28

37

49

55

82

97

Wt.(kg/m)

3P4W1/2E

15

1718

20

24

27

33

40

48

55

70

95

142164

207

365.7

365.7

268.5268.5

151.7

98.4

65.63

47.33

35.75

29.87

23.04

18.86

11.92

7.85

R

210.61

201.8175.37

157.57

96.62

69.64

50.75

37.89

30.24

25.15

18.95

15.12

10.188.38

7.25

117.51

117.51

82.1282.12

75.42

20.16

15.68

11.26

9.76

7.97

6.75

5.02

2.32

1.24

Impedancemicro-ohm

per metre at95 degree celcius

X

107.11

105.3199.91

93.31

85.48

25.4

19.38

14.84

11.86

9.80

7.57

6.05

4.153.43

2.87

384.12

384.12

280.73280.73

169.4

100.44

67.48

48.65

37.06

30.92

24.01

19.52

12.14

7.95

Z

236.28

227.63201.83

184.83

129.01

74.13

54.32

40.59

32.48

27.00

20.41

16.29

10.909.05

7.80

63.34

126.68

185.99185.99

157.63

136.35

113.67

102.47

108.36

103.47

99.77

98

82.58

67.98

1

36.48

69.0991.12

109.29

100.41

96.50

87.90

82.03

91.66

87.12

82.06

78.57

78.5772.57

75.34

62.88

125.76

182.93182.93

173.13

125.84

107.23

96.61

104.44

99.34

97.35

94.05

75.71

52.91

0.8

40.31

77.81104.05

127.45

133.63

98.31

90.46

84.91

94.90

90.07

85.31

81.72

82.2675.88

78.17

54.28

108.56

157.11157.11

157.28

104.16

89.93

80.99

88.68

84.17

83.24

79.67

62.41

52.91

0.6

36.73

71.1396.21

118.96

131.31

86.05

79.60

74.92

83.76

79.43

75.46

72.29

73.0267.31

69.07

43.99

87.98

134.89126.54

134.89

80.14

70.36

63.33

70.46

66.69

66.69

63.11

47.77

41.08

0.4

31.59

61.0484.03

104.87

121.58

70.86

65.92

62.26

69.61

65.96

62.87

60.24

61.0756.25

57.47

32.61

65.22

92.9492.94

108.32

54.64

49.34

44.38

50.66

47.75

48.59

45.96

32.27

28.45

0.2

25.47

49.7269.09

87.24

107.12

53.78

50.47

47.89

53.55

50.69

48.53

46.52

47.4143.62

44.29

20.35

40.7

58.8958.89

78.38

27.93

27.16

24.38

29.58

27.61

29.23

26.08

16.07

15.16

0

18.55

36.4851.92

66.73

88.83

35.20

33.57

32.13

35.95

33.95

32.78

31.44

32.3529.71

29.8

Line to Line Voltage Drop in mV/m atRated Current & Various

Power factors

Line to Line Voltage Drop in mV/m atRated Current & Various

Power factors


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Vertical Feeder Busbar

Horizontal Feeder Busbar

Flat-Wise Elbow

Double Elbow

Horizontal Plug-in Busbar

Edge-Wise Elbow

T-Section

Flange End1

2

3

4

5

6

7

8

9

10

11

12

13

14

Reducer T-Section

Vertical Plug-in Busbar

Tap-off Unit

End Cover

End-Feed Cable Box

Horizontal Hanger

Vertical Spring Support

Cables

15

16

S w i c h Ba r d

to

6

5

4

3

2

1

8

7

10

11

12

13

914

16

15

Typical Busbar Trunking Layout


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BS 5486 Part 2, 1990

IEC 60439-2, 2000

Conform to the relevant codes andrequirements of:

UL 857 / ANSI

IEE / IEEENEMA BU 1

JIS 8364

IEC 529

SEISMIC Protection Certification

All busducts are factory tested to 2.5 kV / 5.0 kV for60 seconds.

CPRI

Certifications & Approvals

L&T Megaduct Busbar Trunking Systemsare tested as a composite system (includingtap off units) and certified by ASTA & CPRIto comply with:

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Notes


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Notes


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