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Assumption University Thailand EE4503 Electrical Systems Design Cable 1.

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Presentation on theme: "Assumption University Thailand EE4503 Electrical Systems Design Cable 1."— Presentation transcript:

1 Assumption University Thailand EE4503 Electrical Systems Design Cable 1

2 Assumption University Thailand Topics Introduction to Cables Cables for low voltage Cables for high voltage Cable selection 2

3 Assumption University Thailand Cables Functionality –Conduct electrical power from one point to other Components –Conductor –Insulator (optional) 3

4 Assumption University Thailand Cables - Conductor Physical –Solid –Strand: flexible, reduce skin effect Material –Copper –Aluminum 4

5 Assumption University Thailand Cables - Conductor http://www.cedengineering.com/upload/Electrical%20Conductors.pdf http://www.geindustrial.com/Newsletter/Aluminum_vs_Copper.pdf 5

6 Assumption University Thailand Cables - Insulator Prevent the physical contact: between two cables, cable-to-ground –Physical durable e.g. impact, heat –Chemical durable, e.g. erosion Commonly used –Polyvinyl Chloride (PVC) –Cross linked Polyethylene (XLPE) 6

7 Assumption University Thailand Cables - Insulator http://www.gridcables.com/power-cable.html 7

8 Assumption University Thailand Cables for High Voltage Withstand the high voltage: insulator (if any) need to be good. Long distance transmission: Cable cost & Installation cost (e.g. electricity pole) Two main types –Bare Wires (reduce cost) –Insulated Wires 8

9 Assumption University Thailand High Voltage Cables Bare Wires Made of Aluminum for lower cost Transmission system (not distribution system for safety): Reduce usage: animals, accident, etc. AAC: All Aluminum Cable AAAC: All Aluminum Alloy Cable ACSR: Aluminum Conductor Steel Reinforced 9

10 Assumption University Thailand High Voltage Cables Bare Wires AAC: Basic type, for shorter span AAAC: Improve the property of Aluminum by making it as an alloy stronger, larger span, corrosion resistance (e.g. sea) ACSR: Insert the steel in the core to have more tension. 10

11 Assumption University Thailand High Voltage Cables Insulated Wires For safety and prevent interruption PIC: Partial Insulated Cable SAC: Space Aerial Cable XLPE: Cross-linked Polyethylene http://www.huffingtonpost.co.uk/2012/03/26/northamptons hire-fire-crew-hot-air-balloonist_n_1378971.html 11

12 Assumption University Thailand High Voltage Cables Insulated Wires - PIC http://www.thaiyazaki-electricwire.co.th/products/pdf/edit_pdf/hvmvpc/33kv_oc.pdf 12

13 Assumption University Thailand High Voltage Cables Insulated Wires - SAC http://www.thaiyazaki-electricwire.co.th/products/pdf/edit_pdf/hvmvpc/35kv_cc.pdf 13

14 Assumption University Thailand High Voltage Cables Insulated Wires - XLPE http://www.thaiyazaki-electricwire.co.th/products/pdf/edit_pdf/hvmvpc/115kv_ce.pdf 14

15 Assumption University Thailand Cables for Low Voltage Below 750V Conductor: Aluminum or Copper Insulator: PVC or XLPE Number of Conductor: 1 or many Special Type to suite the need: Fire Retardent 15

16 Assumption University Thailand Cables for Low Voltage (see pdf) PVC –NAY (aluminum) –THW –VAF –VCT –NYY (double shealth) XLPE –CV MI Fire Safety Cable –Flame Retardant –Fire Resistant 16

17 Assumption University Thailand Cables for Low Voltage Fire Resistant Cable Flame Retardancy Flame Propagation Acid and Corrosive Gas Emission Smoke Emission Fire Resistance (Circuit Integrity) 17

18 Assumption University Thailand Cables for Low Voltage Fire Resistant Cable Fire Alarm System Building Automation System Emergency Lighting System Public Address System Standby Power System Computer Network System Closed Circuit TV System Elevators and Escalators System Fire Pumps and Pressurized Stairs Etc. 18

19 Assumption University Thailand Assignments Take pictures of the cable that you can see and classify the types of those cables. Take pictures of the name-plates 19

20 Assumption University Thailand Cable Selection Usage: Table 5-16 (EIT Standard 2001-51) for low voltage cable Rated Voltage: 300V or 750V Rated Current Multiple Conductors Voltage Drop 20

21 Assumption University Thailand Cable Selection – Rated Current Size of Conductor Type of Insulator Ambient Temperature Installation Conditions: –Calculation: BCC - Technical_data_Cable –Table: BCC - InstallationGuide, AS_NZS_3008.1.1_2009 21

22 Assumption University Thailand Cable Selection – Rated Current Installation Conditions (3.1) Handout: BCC - Installation Guide.pdf 22

23 Assumption University Thailand Cable Selection – Rated Current Installation Conditions (3.1t) Handout: BCC - Installation Guide.pdf 23

24 Assumption University Thailand Cable Selection – Rated Current Installation Conditions (3.2) Handout: BCC - Installation Guide.pdf 24

25 Assumption University Thailand Cable Selection – Rated Current Installation Conditions (3.2t) Handout: BCC - Installation Guide.pdf 25

26 Assumption University Thailand Cable Selection – Rated Current Installation Conditions (3.3) Handout: BCC - Installation Guide.pdf 26

27 Assumption University Thailand Cable Selection – Rated Current Installation Conditions (3.3t) Handout: BCC - Installation Guide.pdf 27

28 Assumption University Thailand Cable Selection – Rated Current Number of Cables in a Conduit Handout: BCC - Installation Guide.pdf 28

29 Assumption University Thailand Cable Selection – Multiple Conductors To increase the rated current Handout: BCC - Installation Guide.pdf 29

30 Assumption University Thailand Cable Selection – Multiple Conductors Only for cable from 50 sq.mm. and up Same type of cables Same length Same wiring method 30

31 Assumption University Thailand Cable Selection – Voltage Drop Voltage drop due to the impedance of the cable NEC –Main incoming to load: no more than 5% –Feeder: no more than 2% –Branch Circuit: no more than 3% 31

32 Assumption University Thailand Cable Selection – Voltage Drop 32 Z cable Z load 220 V (AC)

33 Assumption University Thailand Cable Selection – Voltage Drop 33

34 Assumption University Thailand Cable Selection – Voltage Drop Calculation 34

35 Assumption University Thailand Cable Selection – Voltage Drop Calculation http://www.east-med.schneider-electric.com/documents/electrical-distribution/en/shared/eig_guide2010/Doc-pour- visualisation_basse_def.pdf 35

36 Assumption University Thailand Cable Selection – Rated Current Calculation 36 http://www.east-med.schneider-electric.com/documents/electrical-distribution/en/shared/eig_guide2010/Doc-pour- visualisation_basse_def.pdf

37 Assumption University Thailand Equivalent Circuits Impedance: table for PVC cables 37 2.57.4000.155 44.6250.141 63.0830.131 101.8500.121 161.1560.113 250.7400.107 350.5290.103 500.3700.100 Electrical Systems Design: 700.2640.097 950.1950.096 1200.1540.094 1500.1230.092 1850.1000.091 2400.0770.090 3000.0620.089 4000.0510.088

38 Assumption University Thailand Cable Selection – Rated Current From Table 38 http://www.east-med.schneider-electric.com/documents/electrical-distribution/en/shared/eig_guide2010/Doc-pour- visualisation_basse_def.pdf

39 Assumption University Thailand Cable Selection – General Rules 20% to 25% factor. Using current or VA (not power). 39

40 Assumption University Thailand Cable Selection – Examples Water Heater 6kW –in Air or in Metal Conduit Microwave 2,300VA Industrial Heater 40kW, 400V 3phase –40 o C or 50 o C 40

41 Assumption University Thailand Cable Selection – Examples Motor 37kW, 400V, I n =72A –DOL & Star-Delta Motor 60kW, 400V, pf.=0.8 Room –receptacles 2.5kVA –lighting 500VA 41

42 Assumption University Thailand Handout BCC - Installation Guide HELUKABEL - Installation Operating Conditions AS_NZS_3008.1.1_2009 42

43 Assumption University Thailand Electrical Systems Design: Thai Electrical Code 2002: EIT Standard 2001-51 http://www.bangkokcable.com http://www.thaiyazaki-electricwire.co.th Electrical Installation Guide 2010: schneider-electric Reference 43


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