HD 621 S1:1996/A1:2001

SLOVENSKI STANDARD
01-april-2002
Medium voltage impregnated paper insulated distribution cables
Medium voltage impregnated paper insulated distribution cables
Energieverteilungskabel mit getränkter Papierisolierung für Mittelspannung
Câbles de distribution moyenne tension isolés au papier imprégné
Ta slovenski standard je istoveten z: HD 621 S1:1996/A1:2001
ICS:
29.035.10 Papirni in kartonski izolacijski Paper and board insulating
materiali materials
29.060.20 Kabli Cables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

HARMONIZATION DOCUMENT HD 621 S1/A1
DOCUMENT D'HARMONISATION
HARMONISIERUNGSDOKUMENT July 2001
ICS 29.040.20; 29.060.20
English version
Medium voltage impregnated paper insulated distribution cables
Câbles de distribution moyenne tension Energieverteilungskabel mit getränkter
isolés au papier imprégné Papierisolierung für Mittelspannung
This amendment A1 modifies the Harmonization Document HD 621 S1:1996; it was approved by
CENELEC on 2000-12-01. CENELEC members are bound to comply with the CEN/CENELEC Internal
Regulations which stipulate the conditions for implementation of this amendment on a national level.
Up-to-date lists and bibliographical references concerning such national implementation may be obtained
on application to the Central Secretariat or to any CENELEC member.
This amendment exists in two official versions (English, French).
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. HD 621 S1:1996/A1:2001 E

Page 0-2
Foreword
This amendment to HD 621 S1:1996 has been prepared by WG9 of CENELEC TC 20 “Electric
Cables”. CENELEC TC 20 confirmed at its Stresa meeting (April 1999) that the amendment
should go to the Unique Acceptance Procedure.
A list of additions and amendments to the particular sections of Parts 3 to 4 is given in this
Part 0.
NOTE  During the preparation of this amendment, IEC 60502 (4th edition) has been replaced by
IEC 60502-1 and -2 and HD 405.1 has been superseded by EN 50265.
In general the updating of these references has not been included in this amendment unless a complete section has
been introduced or replaced. Users should refer to these new editions for the most up-to-date information.
The test of the draft was submitted to the Unique Acceptance Procedure and as approved by
CENELEC as amendment A1 to HD 621 S1:1996 on 2000-12-01.
The following dates were fixed:
− latest date by which the existence of the
amendment has to be announced at national level (doa) 2001-07-01

− latest date by which the amendment has to be
implemented at national level by publication of a
harmonized national standard or by endorsement (dop) 2002-01-01

− latest date by which the national standards
conflicting with the amendment have to be withdrawn (dow) 2004-01-01

Page 0-3
Contents
(HD 621 S1:1996 plus Amendment No. 1)
(1)
Part 1 General requirements
(1)
Part 2 Additional test methods
Part 3 Impregnated paper insulated cable-single core, also pre-assembled
3-A Single core draining or non-draining paper insulated cable - unarmoured;
with or without thermoplastic sheath (Type 3A)
3-B Single core cables with paper insulation, non-draining
(1)
3-C Impregnated paper insulated cables - single core cables
3-E Single core cables 12/20 kV and 18/30 kV
3-F Single core cables, also pre-assembled
(1)
3-G Cables with paper insulation - draining - unarmoured - PVC or PE sheathed
- single core
3-I Cables with PE sheath
3-J-1 Single core and SL type paper insulated cables with lead sheath (up to and
including 12,7/22 kV)
3-J-2 Single core and SL type paper insulated cables with lead sheath (19/33 kV)
Part 4 Impregnated paper insulated cables - three core
4-A Multicore draining or non-draining paper insulated cable - belted or screened
cores - one or three metallic sheaths - armoured or unarmoured -
thermoplastic sheath or not.
4-B Multicore cables with paper insulation, non draining
4-C Impregnated paper insulated cable - belted H and SL type cables.
4-D Belted multicore cables with polypropylene yarn serving, or PVC or
polyethylene sheath.
4-E Armoured three-core cables with lead sheaths 12/20 kV and 18/30 kV and
three-core cables 12/15 kV non-radial field
4-F Multicore cables (Belted cables; three screened cores - one lead sheath;
three metallic sheathed cores - one outer covering)
(1)
4-G-1 Impregnated paper insulated cable - three core draining paper insulated
cable - screened cores, one metallic sheath - armoured or unarmoured
serving, PE or PVC sheath
(1)
4-G-2 Impregnated paper insulated cable - three core draining paper insulated
cable - belted, one metallic sheath - armoured or unarmoured serving, PE or
PVC sheath
4-H-1 Three-core belted and screened cables, with lead sheath and steel tape
armour
4-H-2 Three-core SL steel armoured cables
4-I Cables with one lead sheath (Type 4I-1) and with three lead sheaths (Type
4I-2) and with sheaths of PE
4-J-1 Three core cables with lead sheath (19/33 kV)
4-J-2 Three core cables with lead sheath, up to and including 12,7/22 kV
4-J-3 Three core cables with aluminium sheath
4-K Armoured three core cables with lead sheaths and a rated voltage 23/40 kV

(1)
Amendment No. 1 introduces some changes to the text

Page 0-4
“Blank page”
Page 1-0
Part 1
Part 1 : General requirements
Replace pages 1-15 and 1-19 by the following:

Table 4A – Requirements of sheathing compounds PVC (continued)
1 2 3 202122
COMPOUND NO Test Method Unit DMV 44 DMV 45 DMV 46
TYPE PVC sheath PVC sheath PVC sheath
MAXIMUM OPERATING TEMPERATURE OF THE CONDUCTOR °C 90 70 70
Mechanical properties
- before ageing on sample
minimum tensile strength Mpa 12,5 12,5 12,5
minimum elongation at break % 125 125 125
- after ageing on sample
temperature 80 80 80
°C
duration T1 h 168 168 168
minimum tensile strength Mpa 12,5 12,5 12,5
maximum variation T1/T0 % ± 20 ± 20 ± 20
minimum elongation at break % 125 125 125
maximum variation T1/T0 % ± 20 ± 20 ± 20
- after ageing on complete cable (non contamination test)
temperature °C 80 80 60
duration T1 h
duration T2 h 168 168 168
minimum tensile strength Mpa 12,5 12,5
maximum variation T2/T0 % ± 20 ± 20 ± 25
maximum variation T2/T0 %
minimum elongation at break % 125 125
maximum variation T2/T0 % ± 20 ± 20 ± 25
maximum variation T2/T1
Physical and chemical properties
Shrinkage test
duration h
temperature °C
maximum shrinkage %
Note: 1Mpa = 1N/mm
Remark: The tolerance on temperature values is given in HD 605 subclause 1.5.2 but may be
varied if specified in the particular sections
Page 1-15
Part 1
Page 1-19
Part 1
Table 4B - Requirements of sheathing compounds: PE (continued)
1 2 3 10 111213
COMPOUND NO. TEST UNIT DMP 12 DMP 21 DMP 22 DMP 23
TYPE PE sheath PE sheath PE sheath PE sheath
METHOD
MAXIMUM OPERATING TEMPERATURE OF °C 90 90 90 90
THE CONDUCTOR
Mechanical properties
- before ageing on sample
minimum tensile strength MPa 10 10 12,5
minimum elongation at break % 300 300 350 300
- after ageing on sample
temperature °C 100 100 100 110
duration T1 h 240 240 48 336
minimum tensile strength MPa 10
maximum variation T1/T0 %
minimum elongation at break % 300 300 300
maximum variation T1/T0 % ± 25
- after ageing on complete cable
(non contamination test)
temperature °C 100 60
duration T1 h
duration T2 h 168 168
minimum tensile strength MPa
maximum variation T2/T0 %
maximum variation T2/T0 %
minimum elongation at break % 300 300
maximum variation T2/T0 %
maximum variation T2/T1 %
Note: 1MPa = 1N/mm²
Remark: The tolerance on temperature values is given in HD 605 subclause 1.5.2 but may be varied if specified in the particular sections

Page 2-0
Part 2
Part 2: Additional test methods
Replace pages 2-3 and 2-24 by the following:

Page 2-3
Part 2
Page
2.2 Tests on the paper insulation
2.2.1 Test for water soluble impurities in insulating paper . 12
2.2.2 Drainage test
2.2.2.1 Method 1 . 13
2.2.2.2 Method 2 . 14
2.2.3 Measurement of breaking load and elongation at
break of impregnated paper. 14
2.3 Tests on other cable components
2.3.1 Mass of zinc coating of galvanised steel wire or tape. 14
2.3.2 Corrosion test
2.3.2.1 Test on corrosion protection of aluminium sheath . 15
2.3.2.2 Corrosion test (for cables under aluminium . 17
sheath)
2.3.2.3 Test for bitumen coating of aluminium sheath . 17
2.3.2.4 Test for restriction of corrosion of aluminium . 18
sheath
2.3.3 Undersheath pressure test . 18
2.3.4 Water penetration test . 19
2.3.5 Non staining test. 19
2.3.6 Corrugated aluminium sheath removal test . 20
2.4 Bend test on the complete cable
2.4.1 Method 1 . 20
2.4.2 Method 2 . 22
2.4.3 Method 3 . 23
2.5 Measurement of ingress of water . 23
3. Electrical tests
3.1 Insulation voltage test
3.1.1 Voltage test on complete cable. 25
3.2 Power factor, tan δ
3.2.1 Method 1 . 26
3.2.2 Method 2 . 27
3.2.3 Method 3, Tan δ on cables of rated voltage U ≥ 4,8 kV. 27
o
3.3 Sheath voltage test
3.3.1 D.C. voltage test on oversheath . 28

Page 2-24
Part 2
The diameter of the test cylinder shall be:
− Single core armoured cables : 20 x D
− Single core unarmoured cables : 25 x D
− Three core armoured cables : 12 x D
− Three core unarmoured cables : 15 x D
Where D = outer diameter of the cable.
2.5 Measurement of ingress of water
After the bending test (see 2.4.3) a length of approximately 30 m of completed cable is heated
by passing a current through two conductors until the conductor reaches a temperature of
50 °C. One cable end is sealed by means of a lead cap soldered onto the lead sheath and the
other end is sawn off straight and left open.
The cable on the drum is immersed in a water bath, the open end is kept 80 cm below the
water surface. The temperature of water shall be (15 ± 5)°C.
After exposure to the water for 48 hours the ingress of water into the cable is measured. All
materials under the lead sheath are removed and immersed in oil at a temperature between
130 ° and 150 °C. The presence of water is shown by the sizzling of water in hot oil.

Page 3-C-0
Part 3 Section C
Section C: Impregnated paper insulated cables
Single-core cables
Replace pages 3-C-30 and 3-C-31 by the following:

Page 3-C-30
Part 3 Section C
6. Appendix (Tables) (continued)
Table 10 - Rated current carrying capacity, cables in earth, U /U = 18/30 kV
o
1 2 34 56 7 8 9
Insulating Impregnated paper
material
Permissible
60 °C
operating
temperature
Designation NKY NKLEY NAKY NAKLEY
Arrangement
Cross Copper conductor Aluminium conductor
sectional Rated current in A Rated current in A
area in mm
-- - - - - - -
35 156 168 155 165 121 130 120 129
50 185 200 184 195 144 155 143 153
70 229 247 227 238 178 192 177 188
95 276 297 272 281 215 232 212 224
120 316 339 309 317 246 266 243 254
150 354 382 345 351 276 299 271 283
185 400 431 385 384 313 340 305 317
240 463 499 440 427 363 395 351 357
300 522 555 486 461 410 444 392 391
400 591 619 539 499 470 502 442 432
500 666 684 590 535 536 564 494 471

Page 3-C-31
Part 3 S
...