NOTH: The volume rested vity of the insulation ie calculated from the measured insulation resistance by the following formula:
where 6 * volume resistivity, Dm
R - measured insulation resistance, fl
t = length of the sample, m
D ж outer diameter of the insulation, mm
d « Winer diameter of the Insulation, mm
For the sector-shaped cores the ratio D/d is calculated as the ratio of the measured perimeter over the insulation to the measured perimeter over the conductor.Table 2 - Construction of tin conductors of the aluminium cables
|
Phase conductor end neutral conductor as inner conductor, aluminium |
Smaller concentric neutral and protective conductor, copper |
|||
|
Nominal crosssection mm1 |
Number <rf wires in conductor min. |
Maximum conductor resistance at + 20fiC fi/km |
Nominal cross- section of conductor mm* |
Maximum conductor resistance at + 20*C tVkm |
|
16w |
1 |
1.91 |
- |
|
|
35 |
6 |
0.868 |
10 |
1.91 |
|
70 |
12 |
0.443 |
21 |
0.868 |
|
9S«* |
15 |
0.320 |
- |
- |
|
120 |
15 |
0.253 |
41 |
0,443 |
|
185 |
30 |
0.164 |
57 |
0.320 |
|
300 |
30 |
0.100 |
88 |
0.206 |
111 This value is present only in the 31/2 * 1/2 -core cables
ТіЫе 3 - Construction of the conductors of the copper cables
|
Phase conductor and neutral conductor as inner conductor, copper |
Concentric neutral and protective conductor, copper |
|||
|
Nominal crosssection of conductor mm* |
Number of wires in conductor mki |
Maximum conductor resistance at + 20°C Qjlcm |
Nominal cross- section of conductor mm' |
Maximum conductor resistance at *20eC QAtm |
|
1,5 |
1 |
12.1 |
1.5 |
12,1 |
|
2,5 |
1 |
7.41 |
2.5 |
7 41 |
|
6 |
1 |
3.08 |
6 |
3.08 |
|
10 |
1 |
183 |
10 |
1.83 |
|
300 |
34 |
0.0601 |
- |
* |
NOTE; Cross-sections, other than those given In tables 2 and 3, may be used.Раце 5-М 4
HD 604 St: 1994
Part 5 Stetton I
Tabh 4 - Thickneu of inflation
|
Nominal croti-аасікмі of conductor |
Nominal thicknott of mutation |
|
|
mm’ |
XLPE4n>ui*tion |
EPR~muUtioo |
|
|
mm |
mm |
|
1Л |
0.7 |
0.8 |
|
2.5 |
0,7 |
0 8 |
|
6 |
0.7 |
1*0 |
|
10 |
0.7 |
1.0 |
|
16 |
0.7 |
1,0 |
|
35 |
0.9 |
1.2 |
|
70 |
1.1 |
1.4 |
|
95 |
1.1 |
1.6 |
|
120 |
1.2 |
1,6 |
|
195 |
1.6 |
2.0 |
|
300 |
1.8 |
2.4 |
₽вд« Б*МБ HD 604 SI:1994 Part S Section I
Table 6 - ТЫсІспем of bner covering and outer sheath of the cable
|
Cable type |
Number end nendnel croee-aectton ef conductor» |
Approx knelt value d the thfcSneee af й*паг covering |
Nominal chirtneee of ouiM eheeih |
||
|
tapped |
extruded |
||||
|
mm* |
mm |
mm |
mm |
||
|
Aluminium conductor) |
|
|
|
|
|
|
AXMK-HF |
1x300 |
V |
* |
1.8 |
|
|
AXCMK-HF |
Зх 38Al+10Cu |
0.4 |
1.0 |
1-8 |
|
|
|
Зж 70ДІ + 21Си |
0.4 |
ho |
2 0 |
|
|
|
3x12QAI + 41Cu |
0.4 |
1.2 |
2.3 |
|
|
|
Зж1В5АІ + В7Си |
0.4 |
1.4 |
2 6 |
|
|
|
ЗжЗООАІ * 88Cu |
0.6 |
1.6 |
3.0 |
|
|
AXCMK-HF |
Эх 3BAI + 18AI + lOCu |
0Л |
1.0 |
1.8 |
|
|
|
Зи 70ДІ + Э6АІ + 21 Си |
0.4 |
1.2 |
2.0 |
|
|
|
3x12041 + 70AJ + 41O1 |
0Л |
U |
2-3 |
|
|
|
ЗяІВБАІ 4 8БАІ + 87Си |
ОЛ |
1.4 |
2.8 |
|
|
Cooper conductor» |
|
|
|
|
|
|
XMK HF |
1*300 |
A |
a |
1,8 |
|
|
XCMK4F |
Зж 1.6+ 1.6 |
* |
1.0 |
1,8 |
|
|
end |
Зя 1.6+ 2.Б |
• |
1.0 |
1.8 |
|
|
0CMK-HF |
Зж 8 + 6 |
A |
1.0 |
1.8 |
|
|
|
3x10 +10 |
e |
1.0 |
1.8 |
|
|
XCMK-HF |
4м 1.6+ 1.8 |
M |
1.0 |
ІЛ |
|
|
and |
4я 2.6 + 2.Б |
V |
1.0 |
1.8 |
|
|
BCMK4* |
4м б + « |
а |
ro |
1.8 |
|
|
|
4x10 +10 |
- |
1.0 |
1.8 |
|
APPENDIX A
CURRENT RATING INFORMATION
к Basic assumptions
The miikrwm permlsslbb conductor temperatures In continuous operation ага as follows:
EPAnnsuiated power cables in around + 70*C
EPHnnsulatad power cables in ak + 70°C
XLPE-insulated power cables in ргскжмі +65 °С
XLPE^nsulated power cables in ar + 70°C
ki around installations the basic assumptions are:
temperature of ground + 15*C
depth of laying 0,7m
thermal resistivity of soil 0.7 К m/W
In air installations the ambient is ♦ 25®C
Table A1
(aJ AhminhjfTi conductors
Bask permissible current ratings of two or more core 1kV power cables regardless of the insulation material. <See basic assumptions above J Maximum conductor temperature + 7O*C. Current values in amperes.
|
Cross-section of Akumiruum conductor mm* |
Permissible current rating . A |
|||
|
In aif Method of installation |
in ground |
|||
|
A |
В |
|||
|
16 |
46 |
64 |
78 |
|
|
35 |
75 |
105 |
125 |
|
|
70 |
115 |
155 |
185 |
|
|
95 |
135 |
190 |
220 |
|
|
120 |
155 |
220 |
255 |
|
|
185 |
205 |
285 |
330 |
|
|
300 |
2 BO |
380 |
430 |
|
Table Al (concluded)
(bl Соооаг conductor»
|
Cross-section of Copper conductor mm1 |
Permissfcb current rating, A |
|||
|
In air Method of installation |
In ground |
|||
|
A |
В |
|||
|
1.5 |
14 |
14 |
26 |
|
|
2.5 |
20 |
20 |
35 |
|
|
6 |
33 |
33 |
57 |
|
|
10 |
45 |
62 |
77 |
|
|
300 |
360 |
490 |
550 |
|
The methods of installation have boon classified for cables not exceeding 1 kV and insulated conductors as follows:
Method A of installation: Cable has been instated so that the heat transfer coefficient between the cable surface and the outer surface of the wall or the material cowering the cable is К ■ 11 to SO W/®C m The method A of installation is considered to be:
inlaid insulations generaly
installation in lowered ceilings, installation troughs, gutters, mouldings etc
installations that dearly do not belong to the method В of installation,
Method В of installation: Cable has been installed on the surface so that the heat transfer coefficient between the cable surface and the outer surface of the wall or the material covering the cable is К > 50°С m*. The method В of installation is considered to be among others:
installation on surface (also In tubas) with its short passages
cables on racks with its short passages
inlaid insulation in stone constructions {concrete, tiles, etc ] - installation in shafts or cable ducts.
Table A2
Continuous permissible current ratings for three single-core power cablet with aluminium conductor in three phase use In air ini tai let bn Conductor temperature maximum + 70ftC. Current values in amperes.
|
Cross-section of Aluminium conductor |
Permissible current rating when installed |
|
|
mm* |
Flat A |
Trefoil A |
|
300 |
525 |
460 |
Table A3
Continuous permissible Current ratbge for three singie*core power cables with copper conductor In three phase им in air Installation. Conductor temperature maximum + 70*C. Current values in amperes.
|
Cross-section of copper conductor |
Permissible current rating when installed |
|
|
mm* |
Ret A |
Trefoil A |
|
300 |
665 |
580 |
Flat Installation: Cables paraMl, distance between cables equal to one cable diameter
Trefoil installation: Cables in trefoil touching each other.
2.
M¥£Th<FI7
laciou
When the instillation conditions differ from the basic conditions given in Sub-dsuse L the correction factors given in the following tables shall bo used.
2-1 Correction factors in ground metallations
Table A4
Correction lectors tor groups of cables laid directly bi ground
|
Mutual spacing between cables or groups oi caMee, mm |
Number oi mrticore cables or group* d smgtexore cables beside each other |
||||||
|
2 |
3 |
4 |
6 |
« |
В |
10 |
|
|
0 [touching] |
0.79 |
069 |
0.63 |
0.63 |
0.65 |
0.50 |
0 46 |
|
70 |
0 86 |
0*75 |
0-68 |
0.64 |
0-60 |
0.56 |
0ЛЭ |
|
260 |
0Л7 |
0.79 |
0.75 |
0.72 |
0.69 |
0.86 |
0Л4 |
The values apply to mutticore cables and to groups of three single-core cables (in trefoil or flat formation) without or wHh spacing between the cables or the cable groups and with the cables or the cable groups horizontally placed.
