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Annex II.2.1 (I.3A)

Rated electricity currents and some technical parameters of XLPE and EPR kV,24 one phase and 3 phase cables

Technical parameters of XLPE 24kV 3 phase copper core cables

Cross	Resistance of core		Self	Capacita	Rated		Rated	Nominal	Test
section			induction	nce	current in		current in	short	voltage
section	DC	AC	induction	nce	current in		current in	short	voltage
area	DC	AC	coefficient	cable	earth	a	air	circuit
area	20oC	20oC	coefficient	cable	earth	a	air	circuit	(kV/5
cable	(Ω/km)	(Ω/km)	(mH/km)	(µF/km)	20oC (A)		30oC (A)	current at	minutes)
(mm2)								1s (kA)

3x35	0.524	0.668	0.373	0.110	120		113	5.04	30

3x50	0.387	0.493	0.358	0.117	170		163	7.30	30

**	0.641	0.822			134		127	4.65

3x70	0.268	0.342	0.340	0.128	210		201	10.08	30

**	0.443	0.568			164		157	6.51

3x95	0.193	0.246	0.325	0.138	250		242	13.68	30

**	0.320	0.410			195		189	8.83

3x120	0.153	0.195	0.315	0.146	284		278	17.28	30

**	0.253	0.324			222		217	11.16

3x150	0.124	0.158	0.305	0.155	321		317	21.60	30

**	0.206	0.264			251		247	13.95

3x185	0.099	0.126	0.297	0.163	358		356	26.64	30

**	0.164	0.210			282		281	17.21

3x240	0.075	0.096	0.285	0.176	411		415	34.56	30

**	0.125	0.160			325		327	22.32

3x300	0.060	0.077	0.279	0.184	462		472	43.20	30

**	0.010	0.128			368		376	27.90

(**) Aluminum core

294

Technical parameters of cable Cu/Al - XLPE - 24kV - 3 phase

	Cross		DC at 20oC (Ω/km)				Self		Capacita		Rated			Rated			Nominal			Test
	section						induction		nce		current			current			short			voltage
	area						coefficie		cable		in		earth	in	o	air at	circuit			(kV/5
	cable						nt				at		o	30	o	C (A)	current			(kV/5
	cable						nt		(µF/km)		at		20C	30		C (A)	current			minutes)
	(mm2)						(mH/km)		(µF/km)		(A)						at	1s		minutes)
																	(kA)

			DC		AC
			20oC		90oC
			(Ω/km)		(Ω/km)

		3x50	0.387		0.493		0.399		0.100		164				205			7.20		45

	**		0.641		0.822						130				151			4.65		45

		3x70	0.268		0.342		0.378		0.109		202				245		10.08			45

	**		0.443		0.568						158				180			6.51		45

		3x95	0.193		0.246		0.361		0.117		234				280		13.68			45

	**		0.320		0.410						182				217			8.83		45

		3x120	0.153		0.195		0.350		0.123		270				320		17.28			45

	**		0.253		0.324						208				247		11.16			45

		3x150	0.124		0.158		0.338		0.131		304				356		21.60			45

	**		0.206		0.264						234				281		13.95			45

		3x185	0.099		0.126		0.328		0.137		338				415		26.64			45

	**		0.164		0.210						265				327		17.21			45

		3x240	0.075		0.096		0.314		0.148		390				472		34.56			45

	**		0.125		0.160						307				376		22.32			45

(**) Aluminum core
				Technical parameters of cable Cu/Al - XLPE - 24kV - 3 phase
		Cross		DC at 20oC (Ω/km)				Self		Capacita		Rated			Rated			Nominal			Test
		section						induction		nce		current			current			short			voltage
		section		DC		atAC		induction		nce		current			current			short			voltage
		area	o	DC		atAC		coefficient		cable		in	air	at	in air		at	circuit
		area	o	20oC		90oC		coefficient		cable		in	air	at	in air		at	circuit			(kV/5
		cable		(Ω/km)		(Ω/km)		(mH/km)		(µF/km)		30oC (A)			30oC (A)			current			minutes)
		2		(Ω/km)		(Ω/km)				(µF/km)								at	1s		minutes)
		(mm )																(kA)
																		(kA)

		3x240		0.0754		0.098		0.287		0.176			411			415		33.80			30

		**		0.125		0.162		0.287		0.284			325			327		22.2			30

(**) Aluminum core

									295

Technical parameters of cable Cu/Al - XLPE - 24kV - 1 phase

Cross		DC at 20oC (Ω/km)						Self	Capacita	Rated		Rated	Nominal		Test
section		DC at 20oC (Ω/km)						induction	nce	current		current	short		voltage
section								induction	nce	current		current	short		voltage
area	o							coefficie	cable	in	earth	in air at	circuit		(kV/5
area	o	DC			AC			coefficie	cable	in	earth	in air at	circuit
cable								nt		at	20 oC	30oC (A)	current
cable								nt	(µF/km)	at	20 oC	30oC (A)	current		minutes)
		20	o	C	90	o	C	(mH/km)	(µF/km)	(A)			at	1s	minutes)
(mm2)		20		C	90		C
(mm2)		(Ω/km)			(Ω/km)
		(Ω/km)			(Ω/km)								(kA)
													(kA)

1x35		0.514			0.655			0.541	0.142		154	136	5.04		30

1x50		0.379			0.483			0.523	0.155		180	279	7.2		30

**		0.628			0.805						141	217	4.65

1x70		0.262			0.334			0.500	0.174		219	347	10.08		30

**		0.435			0.558						171	270	6.51

1x95		0.189			0.241			0.482	0.193		2	420	13.68		30

**		0.313			0.401						203	328	8.83

1x120		0.150			0.191			0.471	0.207		293	483	17.28		30

**		0.248			0.318						230	378	11.16

1x150		0.122			0.156			0.459	0.225		320	540	21.60		30

**		0.202			0.259						254	425	13.95

1x185		0.097			0.124			0.450	0.242		359	614	26.64		30

**		0.161			0.206						285	485	17.21

1x240		0.074			0.094			0.436	0.271		410	718	34.56		30

**		0.122			0.156						329	573	22.32

1x300		0.059			0.075			0.429	0.290		455	813	43.20		30

**		0.098			0.125						368	652	27.90

1x400		0.046			0.059			0.418	0.325		494	904	57.60		30

**		0.076			0.098						408	740	37.20

(**) Aluminum core

296

Technical parameters of cable Cu/Al - XLPE - 24kV - 3 phase

Cross		Core resistance		Self	Capacitanc	Rated		Rated			Nominal		Test
section		Core resistance		induction	e of cable	current		current			short		voltage
section				induction	e of cable	current		current			short		voltage
area	o			coefficien	(µF/km)	in	earth	in air at			circuit		(kV/5
area	o	DC	AC	coefficien		in	earth	in air at			circuit
		DC	AC	t			o		o		current
cable		20oC	90oC	t		at	20C	30		C (A)	current		minutes)
(mm2)		(Ω/km)	(Ω/km)	(mH/km)		(A)					at	1
											(kA)

3x35		0.521		0.424	0.12		164		173			5.0

**		0.868					127		139			3.3

3x50		0.387		0.406	0.13		194		206			7.2

**		0.641					148		161			4.7

3x70		0.268		0.388	0.14		236		257			10.1

**		0.443					179		199			6.6

3x95		0.193		0.364	0.16		283		313			13.6

**		0.320					214		242			8.9

3x120		0.153		0.346	0.18		322		360			17.2

**		0.253					246		280			11.3

3x150		0.124		0.333	0.19		362		410			21.5

**		0.206					246		318			14.1

3x185		0.099		0.323	0.21		409		469			26.5

**		0.164					308		365			17.4

3x240		0.075		0.313	0.23		474		553			34.3

**		0.125					358		425			22.6

3x300		0.060		0.301	0.25		533		629			42.9

**		0.100					398		481			28.2

3x400		0.047		0.291	0.28		597		717			57.2

**		0.078					446		553			37.6

(**) Aluminum core

297

Technical parameters of cable Cu/Al - XLPE - 24kV - 1 phase

Cross

DC at 20oC (Ω/km)

Self

Capacitan

Rated

Nominal

Test

section

induction

current

short

voltage

area

coefficient

cable

in earth

air

circuit

(kV/5

cable

20oC

90oC

(mH/km)

(µF/km)

at 20oC

30oC (A)

current

minutes)

(mm2)

(A)

(Ω/km)

(kA)

1x240

0.074

0.094

0.436

0.271

490

34.56

1x300

0.059

0.075

0.429

0.290

43.20

1x400

0.046

0.059

0.418

0.325

57.60

Technical parameters of cable Cu/Al - XLPE - 24kV - 3 phase

Cross

DC at 20oC (Ω/km)

Self

Capacitan

Rated

Nominal

Test

section

induction

current

short

voltage

area

coefficient

cable

in earth

air

circuit

(kV/5

cable

20oC

90oC

(mH/km)

at 20oC

30oC (A)

current

(µF/km)

minutes)

(mm2)

(Ω/km)

(A)

(kA)

3x240

0.0754

0.0980

0.320

0.287

718

107.8

3x300

0.059

0.075

0.429

0.290

813

43.20

3x400

0.046

0.059

0.418

0.325

904

57.60

Technical parameters of cable Cu/Al - XLPE - 24kV - 3 phase

Cross

Core resistance

Self

Capacitan

Rated

Nominal

Test

section

induction

current

short

voltage

area

coefficient

cable

in earth

in air at

circuit

(kV/5

cable

(mH/km)

C (A)

current

20oC

90oC

(µF/km)

at 20 C

minutes)

(mm2)

(A)

(Ω/km)

(kA)

3x240

0.0754

0.0777

0.301

0.288

425

718

109.0

298

Underground cable Cu-EPR - 24kV - 3x24

(Protected with gas bag)

Cross		Core resistance		Self	Capacitan	Rated	Rated	Nominal		Test
section		Core resistance		induction	ce	current	current	short		voltage
section				induction	ce	current	current	short		voltage
area	o	DC	AC	coefficient	cable	in earth	in air at	circuit		(kV/5
cable		20oC	90oC	(mH/km)		at 20oC	30oC (A)	current		(kV/5
cable		20oC	90oC	(mH/km)	(µF/km)	at 20oC	30oC (A)	current		minutes)
		(Ω/km)	(Ω/km)		(µF/km)	(A)		at	1	minutes)
2		(Ω/km)	(Ω/km)			(A)		at	1
(mm )								(kA)
								(kA)

3x240		0.0754	0.0981	0.306	0.325	569	718	108		30

Underground cable Cu-EPR - 24kV - 3 phase

(Protected with two steel layers)

Cross		Core resistance		Self	Capacitan	Rated	Rated	Nominal		Test
section				induction	ce	current	current	short		voltage
section		DC	AC	induction	ce	current	current	short		voltage
area	o	20oC	90oC	coefficient	cable	in earth	in air at	circuit		(kV/5
cable		(Ω/km)	(Ω/km)	(mH/km)	µ	at 20oC	30oC (A)	current		minutes)
2		(Ω/km)	(Ω/km)		( F/km)	(A)		at	1
(mm )								(kA)
								(kA)

3x35		0.524	0.67	0.377	0.136	180	190		5	30

**

3x50		0.387	0.49	0.362	0.149	210	225		7	30

**

3x70		0.268	0.34	0.344	0.169	260	280		10	30

**

3x95		0.193	0.25	0.328	0.190	310	330		13.5	30

**

3x120		0.153	0.20	0.318	0.206	350	380		17	30

**

3x150		0.124	0.16	0.310	0.220	390	430		21.5	30

**

3x185		0.0991	0.13	0.300	0.243	440	485		26.5	30

**

3x240		0.0754	0.10	0.289	0.270	505	560		34	30

**

3x300		0.0601	0.08	0.281	0.294	570	630		43	30

**
3x400		0.047		0.273	0.326					30

**

299

Technical parameters of cables - XLPE - 24kV - 3 phase

Cross		Core resistance			Self	Capacitan	Rated	Rated	Nominal		Test
section		Core resistance			induction	ce	current	current	short		voltage
section					induction	ce	current	current	short		voltage
area	o	DC	t	aAC	coefficient	cable	in earth	in air at	circuit		(kV/5
cable		20oC		90oC	(mH/km)		at 20oC	30oC (A)	current		(kV/5
cable		20oC		90oC	(mH/km)	(µF/km)	at 20oC	30oC (A)	current		minutes)
		(Ω/km)		(Ω/km)		(µF/km)	(A)		at	1	minutes)
(mm2)		(Ω/km)		(Ω/km)			(A)		at	1
(mm2)									(kA)
									(kA)

1x35		0.524			0.377	0.136	185				30

**							140

1x50		0.387			0.362	0.140	220				30

**		0.641					170

1x70		0.268			0.344	0.169	265				30

**		0.443					205

1x95		0.193			0.328	0.190	320				30

**		0.320					240

1x120		0.153			0.318	0.206	360				30

**		0.253					275

1x150		0.124			0.310	0.220	405				30

**		0.206					300

1x185		0.0991			0.300	0.243	460				30

**		0.164					340

1x240		0.0754			0.289	0.270	535				30

**		0.125					385

1x300		0.0601			0.281	0.294	605				30

**		0.01					430

1x400		0.047			0.273	0.326	690				30

**		0.0778					475

300

Technical parameters of cables - XLPE - 24kV - 3 phase

Cross		Core resistance						Self	Capacitan	Rated	Rated	Nominal		Test
section		Core resistance						induction	ce	current	current	short		voltage
section								induction	ce	current	current	short		voltage
area	o							coefficient	cable	in earth	in air at	circuit
area	o	DC			AC			coefficient	cable	in earth	in air at	circuit		(kV/5
cable		20	o	C	90	o	C	(mH/km)	(µF/km)	at 20oC	30oC (A)	current		minutes)
		20		C	90		C		(µF/km)	(A)		at	1	minutes)
(mm2)		(Ω/km)			(Ω/km)					(A)		at	1
												(kA)

1x35		0.524			0.655			0.49	0.16	179	197		5.18	30

1x50		0.387			0.483			0.466	0.17	212	235		7.36	30

**		0.641			0.805					164	182		4.89

1x70		0.268			0.334			0.447	0.2	259	293	10.26		30

**		0.443			0.558					201	227		6.81

1x95		0.193			0.241			0.424	0.22	309	354	13.88		30

**		0.320			0.401					239	275		9.19

1x120		0.153			0.191			0.407	0.24	349	408	17.49		30

**		0.253			0.318					273	317	11.58

1x150		0.124			0.156			0.399	0.25	390	461	21.81		30

**		0.206			0.259					304	359	14.43

1x185		0.0991			0.124			0.387	0.28	440	527	26.86		30

**		0.164			0.206					344	411	17.76

3x240		0.0754			0.0981			0.373	0.31	508	621	34.78		30

**		0.125			0.156					400	488	22.98

1x300		0.0601			0.075			0.359	0.33	571	708	43.41		30

**		0.100			0.125					450	557	28.67

1x400		0.047			0.059			0.353	0.37	602	811	57.79		30

**		0.0778			0.098					486	645	38.14

301

Technical parameters of cables - XLPE - 24kV - 3 phase

Cross		Core resistance						Self	Capacita	Rated		Rated			Nominal		Test
section		Core resistance						induction	nce	current		current			short		voltage
section								induction	nce	current		current			short		voltage
area	o	DC			AC			coefficient	cable	in	earth	in air at			circuit		(kV/5
cable		20	o	C	90	o	C	(mH/km)		at	o	30	o	C (A)	current		(kV/5
cable		20		C	90		C	(mH/km)	(µF/km)	at	20C	30		C (A)	current		minutes)
		(Ω/km)			(Ω/km)				(µF/km)	(A)					at	1	minutes)
(mm2)		(Ω/km)			(Ω/km)					(A)					at	1
															(kA)

3x35		0.524						0.377	0.136		171		173			5.18	30

3x50		0.387						0.362	0.149		202		206			7.36	30

**		0.641									154		161			4.49

3x70		0.268						0.344	0.169		246		257		10.26		30

**		0.443									191		199			6.81

3x95		0.193						0.328	0.190		295		313		13.88		30

**		0.320									228		242			9.19

3x120		0.153						0.318	0.206		335		360		17.49		30

**		0.253									260		280		11.58

3x150		0.124						0.310	0.220		376		410		21.81		30

**		0.206									292		318		14.43

3x185		0.0991						0.300	0.243		425		459		26.86		30

**		0.164									331		365		17.76

3x240		0.0754						0.289	0.270		492		553		34.78		30

**		0.125									385		425		22.98

3x300		0.0601						0.281	0.294		554		629		43.41		30

**		0.01									437		481		28.67

3x400		0.047						0.273	0.326		625		554		57.79		30

**		0.0778									495		437		38.14

302

Underground cables - XLPE - 14kV - 3 phase

Cross		Core resistance		Self	Capacitan	Rated	Rated	Nominal		Test
section		Core resistance		induction	ce	current	current	short		voltage
section				induction	ce	current	current	short		voltage
area	o	DC	AC	coefficient	cable	in earth	in air at	circuit		(kV/5
cable		20oC	90oC	(mH/km)		at 20oC	30oC (A)	current		(kV/5
cable		20oC	90oC	(mH/km)	(µF/km)	at 20oC	30oC (A)	current		minutes)
		(Ω/km)	(Ω/km)		(µF/km)	(A)		at	1	minutes)
(mm2)		(Ω/km)	(Ω/km)			(A)		at	1
								(kA)

3x35		0.524	0.668		0.157				5.0

3x50		0.387	0.494		0.172				7.2

3x70		0.268	0.342		0.195				10.0

3x95		0.193	0.247		0.216				13.6

3x120		0.153	0.196		0.236				17.2

3x150		0.124	0.159		0.255				21.5

3x185		0.099	0.127		0.276				26.5

3x240		0.075	0.098		0.308				34.3

3x300		0.060	0.079		0.342				42.9

3x400		0.047	0.063		0.38				57.2

B - Conversion coefficient of load current of XLPE cables 1. Cable directly buried in earth

Conversion coefficient of cable load carrying capacity according to earth temperature

Earth temperature (oC)	20	25		30			35	40

Conversion coefficient	1.08	1.04		1.00		0.96		0.91

Current conversion coefficient for cable by earth resistivity
Earth resistivity (oC cm/W)	70		100		150			250

Conversion coefficient	1.12		1.0		0.87			0.7

Current conversion coefficient of cable by its buried depth
Depth of cable placement	50	70	100		120		160		200

Conversion coefficient	1.02	1.0	0.98		0.97		0.95		0.94

303

Conversion coefficient for group of multi-core cables

	Shape

	Group number	1				2				3		4		5			6		8		10

	Conversion coefficient	1.0				0.86				0.76		0.71		0.67			0.64		0.60		0.57

	Conversion coefficient for group pf cables arranged on one plane
	Shape

	Group number			1				2		3		4			5			6		8		10

	Conversion coefficient			1.00				0.87		0.77		0.73			0.70			0.68		0.65		0.63

	Conversion coefficient for group one-core cables arranged in triangle
	Shape

	Group number		1				2			3		4			5			6		8		10

	Conversion coefficient		1.00				0.89			0.82		0.78			0.75			0.73		0.70		0.68

2. Cables placed in air
				Conversion coefficient by air temperature
	Air temperature (oC)				20				25		30		35			40			45		50
	Conversion coefficient				1.08				1.04		1.00		0.96			0.91			0.87		0.82

304

Conversion coefficients for one-phase cables arranged on one plane

Distance to wall ≥ 2cm			Number of circuits			Picture (trang 95)
Distance between cables is			1	2	3
equal to diameter d of cable			Conversions coefficient
Cables buried in earth			0.92	0.89	0.88
		Number of racks
Cables		1	0.92	0.89	0.88
placed	o	2	0.87	0.84	0.83	Picture (trang 95)
racks		3	0.84	0.82	0.81
		6	0.82	0.80	0.79
		Number of racks
Cables		1	1.00	0.97	0.96
placed	o	2	0.97	0.94	0.93	Picture (trang 95)
racks		3	0.96	0.93	0.92
		6	0.94	0.91	0.90
Arranged near to wall			0.94	0.91	0.89	Picture (trang 95)

Arranged near to wall			0.89	0.86	0.84	Picture (trang 95)
Arranged near to wall

Current conversion coefficient for one phase cables in 3-phase power system and arranged in triangle

Distance to wall ≥ 2cm		Number of circuits
Distance to wall ≥ 2cm
Distance between cables is		1	2	3	Picture (trang 96)
equal to 2d of cable		Conversion coefficient			Picture (trang 96)
equal to 2d of cable		Conversion coefficient

Cables buried in earth		0.95	0.90	0.88

	Number
	racks	0.90	0.90	0.88
Cables	1	0.85	0.85	0.83	Picture
place	2	0.83	0.83	0.81	Picture
racks	2	0.83	0.83	0.81
	3	0.81	0.81	0.79
	6

	Number
	racks	1.00	0.98	0.96
Cables	1	1.00	0.95	0.93	Picture
place	2	1.00	0.94	0.92	Picture
racks	2	1.00	0.94	0.92
	3	1.00	0.93	0.90
	6

Arrangement without conversion of current					Picture

305

Conversion coefficient for single core cables placed on one plane

Distance to wall ≥ 2cm						Number of circuits
Distance to wall ≥ 2cm
Distance	between			cables i							Picture trang 97
Distance	between			cables i		1	2	3	6	9	Picture trang 97
equal diameter d of cable						1	2	3	6	9

						Conversion coefficient
						Conversion coefficient

Cables buried in earth						0.95	0.90	0.88	0.85	0.84

		Number
Cables		racks
Cables
placed	o
racks						0.95	0.90	0.88	0.85	0.84	Picture
racks				1		0.95	0.90	0.88	0.85	0.84	Picture
(limited	air			1		0.90	0.85	0.83	0.81	0.80
(limited	air
ventilation)				2
ventilation)				2		0.88	0.83	0.81	0.79	0.78
				3		0.88	0.83	0.81	0.79	0.78
				3		0.86	0.81	0.79	0.77	0.76
				6		0.86	0.81	0.79	0.77	0.76
				6

		Number
		racks
Cables						1.00	0.98	0.96	0.93	0.92	Picture
Cables	o			1		1.00	0.98	0.96	0.93	0.92	Picture
placed	o			1		1.00	0.95	0.93	0.90	0.89
racks				2		1.00	0.95	0.93	0.90	0.89
				3		1.00	0.94	0.92	0.89	0.88
				3		1.00	0.93	0.90	0.87	0.86
				6		1.00	0.93	0.90	0.87	0.86
				6

Cables	placed		near		to	1.00	0.93	0.90	0.87	0.86	Picture
wall						1.00	0.93	0.90	0.87	0.86	Picture
wall

Arrangement			t	Distance
ensure				to	wal	Distance between cables > 2d					Picture
carrying	capacity			to	wal	Distance between cables > 2d					Picture
of cables				> 2 cm
of cables

306

Conversion coefficient for one-core aluminum cables arranged on one plane

				Number of circuits

Cables adjacent to wall				1		2	3	6	9		Picture trang 98

				Conversion coefficient
				Conversion coefficient

Cables placed in ground				0.90	0.84		0.80	0.75		0.73

		Number	of
		support
Cables		racks
placed
placed		1		0.95	0.84		0.80	0.75		0.73	Picture
racks		1
racks
(limited	ai	2		0.95	0.80		0.76	0.71		0.69
ventilation)				0.95	0.80		0.76	0.71		0.69
ventilation)		3		0.95	0.78		0.74	0.70		0.68
		3

		6		0.95	0.76		0.72	0.68		0.66
				0.95	0.76		0.72	0.68		0.66

		Number	of
		support
		racks
Cables
Cables		1		0.95	0.84		0.80	0.75		0.73	Picture
placed		1
placed
racks		2		0.95	0.80		0.76	0.71		0.69
				0.95	0.80		0.76	0.71		0.69
		3		0.95	0.78		0.74	0.70		0.68
				0.95	0.78		0.74	0.70		0.68
		6		0.95	0.76		0.72	0.68		0.66
				0.95	0.76		0.72	0.68		0.66

Cables placed on structure				0.95	0.78		0.73	0.68		0.66	Picture
or near to wall

307

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