Mains distribution busway

Department of Power supply of industrial enterprises

Course work

On discipline: Electric power supply

On theme: Calculation of electrical loads and making workshop networks schemes

Done by: st. of group EE-13 Sydykova N.N

№ of record book: 134140

Checked: Soltanayev A.M

«____» ___________________ 20___y.

Almaty, 2016

Contents

Task for coursework
	Table 1 – Initial data for option 40
	Table 2 - Initial data of the workshop
	The calculation of the initial data of workshop
	The calculation of electrical loads of workshop.
	Calculation of lighting load of the workshop
	Table 4 - The calculation of loads on the workshop
	Table 5 - Technical data of electroreceivers
	The calculation of the technical data for power consumers and the choice of protective devices
	The choice of circuit breaker, cable and type of busways
	Table 7 - Calculation of protective devices to ER
	Table 8 – Calculation protective devices to DB, DBW, LL, DMBW
	Calculation of short circuit currents
	Calculation of resistance on the circuit area
	Calculation of short circuit on the circuit areas
CONCLUSION

Task for coursework

For one of the workshops of the industrial enterprise is required to perform the following measures:

1 Mark out the supplying nodes of the electrical receivers ER (power boards, distribution busways).

2 Determine the power loads at supply nodes, lighting load and design load of whole workshop with method of utilization factor and maximum coefficient.

3 Select a scheme of supply and distribution network of workshop.

4 Select a number and capacity of transformers, place of location for workshop substation.

5 Determine a section and type of wires, cables and busbars in workshop network.

6 Choose electrical equipment and calculate currents of fuse-links and tripping setting of circuit breaker.

7 Draw a plan of electrical power network of the workshop.

8 Draw a scheme of power supply and distribution network of workshop with the indication of section of wires, cables, and parameters of shutdown and protective equipment and electrical receivers.

9 Specify parameters of the network, protection devices, the neutral wire from complete transformer substation (CTS) to the most remote powerful electric motor, design and peak currents in the designed single line scheme of supply and distribution networks up to 1 kV of the workshop.

10 Determine the three, two and single-phase short-circuit currents in the designated point K1, K2 and K3. Assume conditionally the short-circuit power at the high side of workshop transformer in the range 100¸150 MVA. Calculate twice the single-phase short circuit: at the transformer scheme D/U_о - 11 and the scheme U/U_о - 12.

Table 1 – Initial data for option 40

№ by plan	№ of task
Name of equipment	Installed power of electroreceivers (kW)
1,2	Vertical milling
3,4,21,22,25	Chamber electric furnace
5,23,24	Bell-type electric furnace
6,7	Mortising
10,11,18	Hull-grinding
9,12,13,33	Screw-cutting
14,27	Circular shears
8,16,17	Circular grinding
19,20	Crank Press
	Induction furnace (kVA)
28,29	Shaping-machine
34,38	Radial-Drilling
31,32	Automatic lathes
15,30	Crane with DR-40 %
35,36,37	Horizontal milling
	Plasma heating machine
	Butt-welding machine with DR-25 % (kVA)
	Electric fan

Figure 1 – Plan of thermal workshop

Table 2 - Initial data of the workshop

№	Name of supply nodes	Installed capacity, kW	Mode	Factors
К_и	cosφ	tgφ
1,2	Vertical milling		medium start	0,16	0,6	1,33
3,4,21,22,25	Chamber electric furnace		-	0,6	0,95	0,32
5,23,24	Bell-type electric furnace		-	0,6	0,95	0,32
6,7	Mortising		medium start	0,12	0,5	1,73
10,11,	Hull-grinding		easy start	0,12	0,5	1,16
9,12,13,33	Screw-cutting		medium start	0,16	0,6	1,33
14,27	Circular shears		medium start	0,16	0,6	1,33
8,16,17	Circular grinding		hard start	0,25	0,65	1,16
19,20	Crank Press		medium start	0,16	0,6	1,33
	Induction furnace (kVA)	35,75 (55)	-	0,25	0,65	1,16
28,29	Shaping-machine		hard start	0,25	0,65	1,16
34,38	Radial-Drilling		easy start	0,12	0,5	1,73
31,32	Automatic lathes		easy start	0,12	0,5	1,73
15,30	Crane with DR-40 %	13,91 (22)	medium start	0,25	0,5	1,73
35,36,37	Horizontal milling		medium start	0,16	0,6	1,33
	Plasma heating machine		hard start	0,25	0,65	1,16
	Butt-welding machine with DR-25 % (kVA)	17,5 (50)	medium start	0,25	0,7	1,02
	Electric fan		hard start	0,6	0,8	0,75

The calculation of the initial data of workshop

15, 30) Crane with DR-40 % :

26) Induction furnace (kVA) :

40) Butt-welding machine with DR-25% :

The calculation of electrical loads of workshop

39) Plasma heating machine:

Distribution board:

32) Automatic lathes

36) Horizontal milling

40) Butt-welding machine with DR-25 %

Total distribution board:

The exact value of m is not required, is sufficient to determine m>3 or m ≤3.

At m ≤ 3 effective number of electrical receivers is assumed equal to their actual number n: n_e = n;

At m> 3 and group factor k_u > 0.2 effective number of electrical receivers is defined by

from [table 3] maximum coefficient

At ,

Table 3 – Selecting of maximum coefficient using n_e and k_u

n_e	Use factor k_u
0,1	0,15	0,2	0,3	0,4	0,5	0,6	0,7 and more
	8,00	5,33		2,67		1,6	1,33	1,14
	5,01	3,44	2,69	1,9	1,52	1,24	1,11
	2,94	2,17	1,8	1,42	1,23	1,14	1,08
	2,28	1,73	1,46	1,19	1,06	1,04		0,97
	1,31	1,12	1,02		0,98	0,96	0,94	0,93
6-8	1,2		0,96	0,95	0,94	0,93	0,92	0,91
9-10	1,1	0,97	0,91	0,9	0,9	0,9	0,9	0,9
10-25	0,8	0,8	0,8	0,85	0,85	0,85	0,9	0,9
25-50	0,75	0,75	0,75	0,75	0,75	0,8	0,85	0,85
More than 50	0,65	0,65	0,65	0,7	0,7	0,75	0,8	0,8

Calculation of lighting load of the workshop

– area of production workshop;

where k_d.light.=0,85 – demand factor for active power of lighting load, , – reactive power factor.

According to the calculations we select the transformer dry and protected (protective cover) type ТСЗ-630

– load factor, which should be in the range of 0.6 - 0.85.

Table 4 – The calculation of loads on the workshop

№	Name of supply nodes and ER groups	n	Installed capacity, kW	К_и	cosφ	tgφ	Average powers	n_э	К_м	n∙Рн2	I_long	Maximum design load	I_d, А


One ER	∑Р	Р_sh, kW	Q_sh, kVar	Р_м, kW	Q_м, kVar	S_м, kVA
	Plasma heating machine				0,25	0,65	1,16	22,50	26,10	1,00	4,00	8100,00	210,37	22,50	28,71	36,48	55,42
Distribution boards
	Automatic lathes				0,12	0,50	1,73	0,96	1,66			64,00	24,31
	Horizontal milling				0,16	0,60	1,33	3,04	4,04			361,00	48,11
	Butt-welding machine with DR-25 % (kVA)		17,5	17,5	0,25	0,70	1,02	4,38	4,46			306,25	37,98
	Electric fan				0,60	0,80	0,75	18,00	13,50			900,00	56,98
	Hull-grinding				0,12	0,50	1,16	0,72	0,84			36,00	18,23
Total distribution boards		=30/6>3	80,5	0,34			27,10	50,60	5,37	1,00	1667,25	185,61	27,10	55,66	61,91	94,06
Distribution busway 1
3,4	Chamber electric furnace				0,60	0,95	0,32	42,00	13,44			2450,00	55,98
	Bell-type electric furnace				0,60	0,95	0,32	24,00	7,68			1600,00	63,97
6,7	Mortising				0,12	0,50	1,73	3,84	6,64			512,00	48,62
9,12,13,33	Screw-cutting				0,16	0,60	1,33	8,32	11,07			676,00	32,92
1,2	Vertical milling				0,16	0,60	1,33	5,76	7,66			648,00	45,58
	Circular shears				0,16	0,60	1,33	2,72	3,62			289,00	43,05
	Crane with DR-40 %		13,91	13,91	0,25	0,65	1,16	3,48	4,03			193,49	32,51
8,16,17	Circular grinding				0,25	0,65	1,16	18,00	20,88			1728,00	56,10
10,11	Hull-grinding				0,12	0,5	1,16	1,44	1,67			72,00	18,23
	Radial-Drilling				0,12	0,5	1,73	0,84	1,45			49,00	21,27
	Automatic lathes				0,12	0,5	1,73	0,96	1,66			64,00	24,31
35,37	Horizontal milling				0,16	0,6	1,33	6,08	8,09			722,00	48,11
Total distribution busway 1		=40/6>3	397,91	0,30			117,44	87,89	11,05	0,75		490,65	88,08	87,89	124,43	189,05

Table 4 continuation – The calculation of loads on the workshop

distribution busway 2
21,22,25	Chamber electric furnace				0,60	0,95	0,32	63,00	20,16		3675,00	55,98
19,20	Crank Press				0,16	0,6	1,33	4,80	6,38		450,00	37,98
28,29	Shaping-machine				0,25	0,65	1,16	10,50	12,18		882,00	49,09
	Crane with DR-40 %		13,91	13,91	0,25	0,5	1,73	3,48	6,02		193,49	42,27
23,24	Bell-type electric furnace				0,60	0,95	0,32	48,00	15,36		3200,00	63,97
	Induction furnace		35,75	35,75	0,25	0,65	1,16	8,94	10,37		1278,06	83,56
	Circular shears				0,16	0,6	1,33	2,72	3,62		289,00	43,05
	Radial-Drilling				0,12	0,5	1,73	0,84	1,45		49,00	21,27
Total distribution busway 2		=40/7>3	330,66	0,43			142,28	75,54	6,30	0,85		120,93	83,09	146,73	222,93
Lighting board							17,14	5,65				17,14	5,65	17,14	26,00
Total TSS		=90/6>3	899,07	0,34			309,31	240,13	17,13	0,75		231,98	240,13	333,88	507,28

Table 5 - Technical data of electroreceivers

№	Name of supply nodes and ER groups	Р_r	I_r	К_cor	I_start	Mode	α	I_start /α	Type of protection



	Plasma heating machine		210,37		631,11	Hard start	1,6	394,44	circuit breaker
Distribution boards
	Automatic lathes		24,31		145,86	Easy start	2,5	58,34	fuse
	Horizontal milling		48,11		192,45	Medium start		96,23	fuse
	Butt-welding machine with DR-25 % (kVA)	17,5	37,98		113,95	Medium start		71,22	fuse
	Electric fan		56,98		170,93	Hard start	1,6	106,83	fuse
	Hull-grinding		18,23		109,39	Easy start	2,5	43,76	Fuse
Distribution busway 1
3,4	Chamber electric furnace		55,98		55,98	-	1,6	34,98	circuit breaker
	Bell-type electric furnace		63,97		63,97	-	2,5	25,59	circuit breaker
6,7	Mortising		48,62		194,48	Medium start		97,24	Fuse
9,12,13,33	Screw-cutting		32,92		131,68	Medium start		65,84	Fuse
1,2	Vertical milling		45,58		182,32	Medium start		91,16	Fuse
	Circular shears		43,05		172,19	Medium start		86,10	Fuse
	Crane with DR-40 %	13,91	32,51		130,06	Medium start		65,03	Fuse
8,16,17	Circular grinding		56,10		168,30	Hard start	1,6	105,19	circuit breaker
10,11	Hull-grinding		18,23		109,39	Easy start	2,5	43,76	Fuse
	Radial-Drilling		21,27		127,62	Easy start	2,5	51,05	Fuse
	Automatic lathes		24,31		145,86	Easy start	2,5	58,34	Fuse
35,37	Horizontal milling		48,11		192,45	Medium start		96,23	Fuse
distribution busway 2
21,22,25	Chamber electric furnace		55,98		55,98	-	1,6	34,98	circuit breaker
19,20	Crank Press		37,98		151,93	Medium start		75,97	Fuse
28,29	Shaping-machine		49,09		147,26	Hard start	1,6	92,04	Fuse
	Crane with DR-40 %	13,91	42,27		169,07	Medium start		84,54	Fuse
23,24	Bell-type electric furnace		63,97		63,97	-	2,5	25,59	circuit breaker
	Induction furnace	35,75	83,56		250,69	Hard start	1,6	156,68	circuit breaker
	Circular shears		43,05		172,19	Medium start		86,10	Fuse
	Radial-Drilling		21,27		127,62	Easy start	2,5	51,05	Fuse

The calculation of the technical data for power consumers and the choice of protective devices

Selecting of circuit breakers for ER №39 is made according on the following conditions:

Selection of the fuses for ER №32 is made according on the following conditions:


	4

Selecting the wire to the electrical receiver №32 and cable to the load nodes is made according to the following conditions:

Where – protection current of fuse,

– protection factor,

– correcting coefficient on the conditions of installation of wiring and cables

Table 6 - table of correcting factor

The distance between cables in the light	Correcting coefficient at the number of cables

		0,9	0,85	0,8	0,78	0,75
		0,92	0,87	0,84	0,82	0,81
		0,93	0,9	0,87	0,86	0,85

the choice of circuit breaker, cable and type of busbars

Distribution board:

Selecting of circuit breaker ВА 51-31-1 for distribution board is made according on the following conditions

For given power node we should select distribution board ПР8501-002-21УЗ

For given power node we select cable ААБГ 3х25

Distribution busway 1

Selecting of circuit breaker ВА 51-35 for distribution busway is made according on the following conditions

For given power node we should select distribution busway КОА0155-II-STD

For given power node we select cable ААБГ 3х70

Distribution busway 2

Selecting of circuit breaker ВА 51-35 for distribution busway is made according on the following conditions

For given power node we should select distribution busway КОА0155-II-STD

For given power node we select cable ААБГ 3х95

Lighting load:

Selecting of circuit breaker ВА 51-35 for lighting load is made according on the following conditions

For given power node we should select distribution busway ПР8501-002-21УЗ

For given power node we select cable ААБГ 3х2,5

Mains distribution busway

Selecting of circuit breaker ВА 51-39 for mainsdistribution busway is made according on the following conditions

For given power node we should select main busway MR 160-800

Table 7 – Calculation of protective devices to ER

№	Design current, А	Circuit breaker	Fuse	Type of protection device	К_prot	Wires's current load	К_cor	I_pem.busway	Mark and conductor cross-section
I_long	I_start	I_r.c.b., А	Tripping current, А	Installation of instant trigger, А	Fuse current, А	I_r.fuse, А	(К_prot∙I_prot)/К_cor	I_start/ К_cor
I_d_._tip	I_r.tip	I_{trigger tip}	I_r.tip	I_d.fuse-link	I_r.fuse-link
	210,37	631,11		210,37		788,89				ВА51-35	0,22	55,00	210,37		ААБГ-3х120
Distribution board
	24,31	145,86						58,34		НПН2	0,33	26,65	31,17	0,78	АППВ-4х10
	48,11	192,45						96,23		ПН2	0,33	42,31	61,68	0,78	АППВ-4х25
	37,98	113,95						71,22		ПН2	0,33	42,31	48,70	0,78	АППВ-4х16
	56,98	170,93						106,83		ПН2	0,33	52,88	73,05	0,78	АППВ-4х35
	18,23	109,39						43,76		НПН2	0,33	26,65	23,37	0,78	АППВ-4х4
Distribution busway 1
3,4	55,98	167,93		55,98		209,91				ВА-51-31-1	0,22	18,48	74,63	0,75	АППВ-4х35
	63,97	383,83		63,97		479,79				ВА-51-31-1	0,22	29,33	85,30	0,75	АППВ-4х50
6,7	48,62	194,48						97,24		ПН2	0,33	44,00	64,83	0,75	АППВ-4х25
9,12,13,33	32,92	131,68						65,84		ПН2	0,33	35,20	43,89	0,75	АППВ-4х16
1,2	45,58	182,32						91,16		ПН2	0,33	44,00	60,77	0,75	АППВ-4х25
	43,05	172,19						86,10		ПН2	0,33	44,00	57,40	0,75	АППВ-4х25
	32,51	130,06						65,03		ПН2	0,33	35,20	43,35	0,75	АППВ-4х16
8,16,17	56,10	168,30		56,10		210,37				ВА-51-31-1	0,22	18,48	74,80	0,75	АППВ-4х35
10,11	18,23	109,39						43,76		НПН2	0,33	27,72	24,31	0,75	АППВ-4х4
	21,27	127,62						51,05		НПН2	0,33	27,72	28,36	0,75	АППВ-4х6
	24,31	145,86						58,34		НПН2	0,33	27,72	32,41	0,75	АППВ-4х10
35,37	48,11	192,45						96,23		ПН2	0,33	44,00	64,15	0,75	АППВ-4х25
Distribution busway 2
21,22,25	55,98	167,93		55,98		209,91				ВА-51-31-1	0,22	17,33	69,97	0,8	АППВ-4х25
19,2	37,98	151,93						75,97		ПН2	0,33	41,25	47,48	0,8	АППВ-4х16
28,29	49,09	147,26						92,04		ПН2	0,33	41,25	61,36	0,8	АППВ-4х25
	42,27	169,07						84,54		ПН2	0,33	41,25	52,84	0,8	АППВ-4х25
23,24	63,97	383,83		63,97		479,79				ВА-51-31-1	0,22	22,00	79,97	0,8	АППВ-4х35
	83,56	250,69		83,56		313,36				ВА-51-31-1	0,22	27,50	104,45	0,8	АППВ-4х50
	43,05	172,19						86,10		ПН2	0,33	41,25	53,81	0,8	АППВ-4х25
	21,27	127,62						51,05		НПН2	0,33	25,99	26,59	0,8	АППВ-4х6

Table 7 – Calculation protective devices to DB, DBW, LL, DMBW

№	Design current, А	Circuit breaker	Type of protection device	К_prot	Current load of wires	К_cor	I_pem.busway.	Mark and conductor cross-section	I_long DB	Name
I_long	I_start	I_r.cb, А	Tripping current, А	Installation of instant trigger, А	(К_prot∙I_prot)/К_cor	I_start/ К_cor
I_d_._tip	I_r.tip	I_{trigger tip}	I_r.tip
DB	94,06	-		94,06		412,44		ВА51-31-1	0,22		94,06		ААБГ-3х25	ПР8501-002-21УЗ
DBW1	189,05	-		189,05		1547,49		ВА51-35	0,22		189,05		ААБГ-3х70	КОА0155-II-STD
DBW2	222,93	-		222,93		1225,03		ВА51-33	0,22		222,93		ААБГ-3х95	КОА0155-II-STD
LL		-			31,5	26,00	94,5	ВА51-31-1	0,22	6,93			ААБГ-3х2,5	ПР8501-002-21УЗ
Total TSS	507,28	-		507,28		2475,98		ВА51-39	0,22	138,6	507,28	-	-	MR 160-800