HD 629.2 S2:2006

SLOVENSKI SIST HD 629.2 S2:2006
STANDARD
may 2006
Preskusne zahteve za pribor, ki se uporablja na elektroenergetskih kablih za
naznačene napetosti od 3,6/6(7,2) kV do vključno 20,8/36(42) kV – 2. del:
Kabli, izolirani z impregniranim papirjem
Test requirements on accessories for use on power cables of rated voltage from
3,6/6(7,2) kV up to 20,8/36(42) kV – Part 2: Cables with impregnated paper
insulation
ICS 29.035.10; 29.060.20 Referenčna številka
SIST HD 629.2 S2:2006(en)

© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

This Harmonization Document was approved by CENELEC on 2005-09-01. CENELEC members are bound to

comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of this

Up-to-date lists and bibliographical references concerning such national implementations may be obtained on

This Harmonization Document exists in three official versions (English, French, German).

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech

Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

This Harmonization Document was prepared by the Technical Committee CENELEC TC 20, Electric cables.

The text of the draft was submitted to the formal vote and was approved by CENELEC as HD 629.2 S2 on

This Harmonization Document supersedes HD 629.2 S1:1997 and its amendment A1:2001; it also includes

This Harmonization Document has been written as part of a series of standards to satisfy the Public

Procurement Directive, and is complementary to HD 621, which covers impregnated paper insulated power

This standard defines the requirements, which may be called up for joints, stop ends, separable connectors,

indoor and outdoor terminations when used with impregnated paper insulated power cables covered by

HD 621. The equivalent requirements for extruded power cables are given in HD 629.1 S2.

1 Scope...........................................................................................................................................................4

2 Normative references ..................................................................................................................................5

3 Definitions....................................................................................................................................................5

4 Components ................................................................................................................................................7

5 Test assemblies...........................................................................................................................................8

6 Range of compliance.................................................................................................................................10

7 Test sequences .........................................................................................................................................10

8 Test results ................................................................................................................................................11

Annex A (informative) Identification of test cable (paper insulated) .................................................................27

Annex B (informative) Identification of test cable (extruded insulation)............................................................28

Table 1 – Test cable cross-sections for separable connectors ..........................................................................9

Table 2 – Indoor terminations for impregnated paper insulated cables (including shrouded terminations) .....12

Table 3 – Outdoor terminations for impregnated paper insulated cables.........................................................13

Table 4 – Joints and transition joints for impregnated paper insulated cables .................................................14

Table 5 – Stop ends for impregnated paper insulated cables ..........................................................................15

Table 6 – Screened separable connectors for impregnated paper insulated cables........................................16

for impregnated paper insulated cables............................................................................................................18

Table 8 – Additional tests for non-circular conductor profile and/or insulation screen compliance ................19

Table 9 – Additional tests for smallest and largest cable cross section compliance ........................................20

Table 10 – Summary of test voltages .............................................................................................................21

Figure 1 – Test arrangements for terminations ................................................................................................22

Figure 2 – Test arrangements for joints............................................................................................................23

Figure 3 – Test arrangements for stop ends ....................................................................................................24

Figure 4 – Test arrangements for screened separable connectors..................................................................25

Figure 5 – Test arrangement for unscreened separable connectors ...............................................................26

This standard specifies performance requirements for type tests for cable accessories for use on

Formerly, approvals of such products have been achieved on the basis of national standards and

specifications and/or the demonstration of satisfactory service performance. The publication of this

CENELEC standard does not invalidate existing approvals. However, products approved to such earlier

standards or specifications shall not claim approval to this CENELEC standard unless specifically tested to it.

It is not necessary to repeat these tests, once successfully completed, unless changes are made in the

materials, design or manufacturing process, which might affect the performance characteristics.

Accessories for special applications such as submarine cables, ships cables or hazardous situations

(explosive environments, fire resistant cables or seismic conditions) are not included.

- straight joints, branch joints and stop ends and transition joints of all designs, suitable for use underground

- screened or unscreened plug-in type or bolted-type separable connectors capable of interfacing with

The rated voltages U /U (U ) of the accessories covered by this standard are 3,6/6(7,2) - 3,8/6,6(7,2) -

6/10(12) - 6,35/11(12) - 8,7/15(17,5) - 12/20(24) - 12,7/22(24) - 18/30(36) - 19/33(36) - 20,8/36(42) kV where:

U is the rated power-frequency voltage between conductor and earth or metallic screen, for which the cable

U is the rated power-frequency voltage between conductors for which the cable accessory may be used;

U is the maximum value of the 'highest system voltage' for which the cable accessory may be used.

The continuous current rating of a termination or joint for impregnated paper insulation power cables shall be

in accordance with the appropriate cable specified in HD 621 and shall be suitable for operation at the rated

current and under short circuit fault conditions at the temperatures stated therein.

The current rating of a separable connector is governed by the current rating of the mating bushing, (see

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

EN 50180 Bushings above 1 kV up to 36 kV and from 250 A to 3,15 kA for liquid filled

EN 50181 Plug-in type bushings above 1 kV up to 36 kV and from 250 A to 1,25 kA for

EN 61238-1 Compression and mechanical connectors for power cables for rated voltages up to

EN 61442 Test methods for accessories for power cables with rated voltages from 6 kV

HD 428.2.2 Three-phase oil-immersed distribution transformers 50 Hz, from 50 to 2 500 kVA with

highest voltage for equipment not exceeding 36 kV – Part 2: Distribution transformers

with cable boxes on the high-voltage and/or low-voltage side – Section 2: Cable boxes

type 1 for use on distribution transformers meeting the requirements of HD 428.2.1 S1

HD 620 Distribution cables with extruded insulation for rated voltages from 3,6/6 (7,2) kV to

IEC 60050-461 International Electrotechnical Vocabulary - Chapter 461: Electric cables

For the purposes of this document, the following terms and definitions apply together with those given in

device fitted to the end of a cable to ensure electrical connection with other parts of the system and to

termination intended for use where it is not exposed to either solar radiation or weathering

termination intended for use where it is exposed to either solar radiation or weathering or both

air- or compound-filled box fully enclosing a termination (IEV 461-10-03 modified)

indoor termination with additional insulation at the bushing connection and used in an air-filled terminal box

accessory suitable for use in air or underground which makes a connection between two or more insulated

accessory making a connection between two cables to form a continuous circuit (IEV 461-11-01)

straight or branch joint making a connection between cables having different types of extruded insulation

accessory providing a means of insulating the unconnected end of an energized cable

fully insulated termination permitting the connection and the disconnection of a cable to other equipment

irreversible degradation by formation of paths, which are conductive even under dry conditions, starting and

developing on the surface of an insulating material, and which may occur on surfaces in contact with air and

irreversible and non-conducting degradation of the surface of the insulator that occurs by loss of material, and

NOTE Shallow surface traces, commonly tree-shaped, may occur on terminations after partial flashover. These traces are acceptable

as long as they are non-conductive. When they are conductive they are classed as tracking.

metal enclosure in intimate contact with the outer screen of a separable connector and having at least the

same current carrying capacity to earth as the metallic screen of the cable with which the separable

Connectors used within the accessory shall comply with EN 61238-1 where applicable, or with another

It is not a pre-requirement for compliance with this performance standard but, if component material

The cables used for testing shall comply with HD 620 and/or HD 621 as applicable. It is recommended that

Connectors used within the accessories shall be identified by the specification with which they comply.

• for terminations, joints or stop ends; 120 mm² or 150 mm² or 185 mm² or 240 mm²,

• for separable connectors, as indicated in Table 1 for each rating, using either aluminum or copper

Accessories shall be assembled in the manner specified in the manufacturer's instructions, with the grade

and quantity of materials supplied. A joint designed for crossed cores shall be so assembled.

Terminations shall be tested using the arrangement and with the number of samples detailed in Figure 1.

A termination intended to be used in a metallic terminal box shall normally be tested in the specified terminal

For practical reasons, it is permissible to carry out the tests with the terminations enclosed in a test terminal

box fabricated from rigid metallic mesh or from insulating material lined with metal foil. The box shall allow

The test terminal box shall be of the same shape and dimensions (e.g. creepage lengths and clearances) as

the specified terminal box and be provided with conductor terminals and bushings of the type used in service.

When only one of the termination samples is required to be tested in the terminal box (see 6.5), the remote

Joints and stop ends shall normally be designed and tested to withstand a height of water of 1 m (10 kPa

For special applications and in situations subject to a high water table or prone to flooding, this height of

water may be insufficient to ensure the satisfactory performance of the moisture seals. In such cases, upon

agreement between manufacturer and user, the accessories shall be tested using an increased water height

Testing at one water height will achieve compliance for that pressure only. Testing at both 1 m and 20 m

water heights will achieve compliance for those water heights and all intermediate pressures.

Where a branch joint is being tested, only the main cable shall carry heating current.

Tests on separable connectors shall be performed with the separable connector installed on its mating bushing.

Unscreened separable connectors shall be tested at the minimum phase-to-phase and phase-to-earth

NOTE 1 The current value shall be sufficient to achieve the specified temperature of the

NOTE 2 The use of the cross-sections in Table 1 may lead to over-heating of the bushing

while achieving the required conductor temperature. Under these circumstances, it is

permissible to use a conductor one size smaller. If bushing failure occurs, the test will be

6.1 Compliance for one type of accessory for the range of cable conductor cross-sections from 95 mm² to

300 mm² shall be obtained by successfully completing all the appropriate tests of Tables 2 to 7 of this

Extension of this compliance for the same type of accessory on larger or smaller cable conductor cross-

sections may be obtained by satisfactory completion of the additional test sequence in Table 9, on the

6.2 For compliance of an accessory for cable conductor cross sections outside this range the conductor

cross-section to be tested shall be subject to agreement between the interested parties.

6.3 Compliance is independent of the cable conductor material; tests may be carried out with either

6.4 Compliance for accessories tested on cables with shaped conductors shall cover the same type of

If compliance has been obtained using circular conductors, extension to shaped conductors may be obtained

6.5 Compliance for accessories tested on cables with one type of insulation screen may be extended to

another type of insulation screen by satisfactory completion of the test sequence in Table 8.

6.6 Compliance obtained for a three-core accessory shall extend to a single-core accessory of the same

6.7 Compliance for a particular design of termination in a specified terminal box shall be obtained by the

satisfactory completion of the test sequence in Table 2. If compliance has already been obtained for a

termination design separate from the terminal box, it is necessary to carry out the test sequence with only one

Satisfactory completion of the appropriate tests of Table 2 for a termination for one design of terminal box

may allow the compliance to be extended to that termination in another terminal box design by comparison of

the detail drawings of the boxes. If there are differences in the design and/or dimensions, the impulse voltage

test at ambient temperature shall be repeated, by agreement between the manufacturer and the customer.

6.8 Compliance shall be restricted to the electrical design and type of cables (i.e. belted or radial field,

The test sequences for the various types of accessory are detailed in Tables 2 to 7, with additional tests in

This test is a three-phase test required for single-core cable accessories designed for initial peak current

larger than 80 kA and for three-core cable accessories designed for initial peak current larger than 63 kA.

Class 1 Three core accessories designed for initial peak currents above 63 kA up to and including 80 kA.

Class 2 Three core and single core accessories designed for initial peak currents above 80 kA up to and

Class 3 Three core and single core accessories designed for initial peak currents above 100 kA up to

The examination at the end of a test sequence is for information only but the results shall be recorded in the

Written reports on type tests proving compliance with this standard shall be made available to the customer.

The details of the test arrangements, the sequence of tests and details of the accessory tested including, for

example, cross-section of conductors, type of conductor connectors, minimum clearance between

The test reports shall be signed by a representative of the body carrying out the tests. This may be the

If any of the samples does not meet the requirements, it shall be dismantled and inspected to establish the

cause of failure. There is no requirement for details of such failures to be recorded in a test report.

If the failure is as detailed in 8.3.1, 8.3.2 or 8.3.3 the test sequence may be repeated as stated.

If there is no evidence of error or failure as detailed in 8.3.1, 8.3.2 or 8.3.3 the type of accessory is not

If an accessory fails to meet the requirements due to either installation or test procedure errors, the test shall

If a bushing failure occurs, the test shall be declared void without discrediting the accessory.

Tests may be repeated using new bushings, starting from the beginning of the test sequence.

If a cable fails beyond any part of the accessory, the test shall be declared void without discrediting the

Tests may be repeated using new accessories, starting from the beginning of the test sequence or,

alternatively, by repairing the cable and continuing the test sequence from the point of break.

4 Heating cycle voltage in air 9 x 126 cycles at 1,5 U no breakdown nor flashover

9 Impulse voltage at ambient 6 x x 10 impulses of each polarity, no breakdown nor

(1) This test is only required for accessories that are equipped with a connection to, or adaptor for, the metallic screen of the

(4) No breakdown nor flashover, no more than 3 trips, no substantial damage. It is considered that a substantial damage has

occurred when it is evident that the performance of the accessory has been severely reduced by:

and/or (ii) erosion to a depth of 2 mm or 50 %, whichever is the smaller, of the wall thickness of the insulating

(5) The accessories shall be examined and the following information included in the test report:

and/or (iii) corrosion and/or tracking and/or erosion which would, in time, lead to failure of the accessory;

NOTE Refer to Clause 8 of EN 61442 for details of the calibration of conductor heating current required to have been carried

Table 3 – Outdoor terminations for impregnated paper insulated cables (see Figure 1)