BS 7912:2012+A1:2017
$198.66
Power cables with XLPE insulation and metal sheath, and their accessories, for rated voltages from 66 kV (Um = 72.5 kV) to 132 kV (Um = 145 kV)
| Published By | Publication Date | Number of Pages |
| BSI | 2017 | 64 |
This British Standard specifies tests and requirements for power cables with XLPE insulation and metal sheath and their accessories for rated voltages from 66 kV (U m = 72.5 kV) to 132 kV (U m = 145 kV) for fixed installations.
NOTE 1 Cable systems to this standard do not normally have high electrical stresses at the conductor or insulation screen. If the calculated nominal electrical stresses at the conductor screen will be higher than 8.0 kV/mm and/or at the insulation screen higher than 4.0 kV/mm, then attention is drawn to the need to conduct a prequalification test in accordance with IEC 60840:2011 , Clause 13.
This British Standard is applicable to single-core cables and three-core cables with separate cores and to their accessories for usual conditions of installation and operation. It is not applicable to special cables and their accessories, such as those designed for submarine cables, for which modification to the standard tests might be necessary or special test conditions might need to be devised.
NOTE 2 Annex A gives tests and requirements for cable bonding leads. Annex B gives tests and requirements for sheath voltage limiters (SVLs), while Annex C gives tests and requirements for link housings. Annex D gives an additional water blocking test for phase conductors.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | Foreword |
| 9 | 1 Scope 2 Normative references |
| 10 | 3 Terms and definitions |
| 11 | 4 Voltage designation and cable design features 4.1 Voltage designation |
| 12 | Table 1 — Test voltages |
| 13 | 4.2 Cable maximum temperatures Table 2 — Cable maximum temperatures 4.3 Semi-conducting screens 4.4 Metal cable sheathing materials and metal screen 4.5 Oversheath materials 4.6 Precautions against water penetration in cables |
| 14 | 5 Marking of cables 5.1 External marking 5.2 Identification of year and month of manufacture 5.3 Mark of an approval organization 6 Cable characteristics |
| 15 | 7 Accessory characteristics 8 Test conditions 8.1 Ambient temperature |
| 16 | 8.2 Frequency and waveform of power frequency test voltage 8.3 Waveform of impulse test voltage 9 Routine tests on cables and on the main insulation of prefabricated accessories 9.1 General 9.2 Partial discharge test |
| 17 | 9.3 Voltage test 9.4 Electrical test on oversheath of the cable 10 Sample tests 10.1 Cables Table 3 — Number of samples for sample tests |
| 18 | Table 4 — Test conditions and requirements for particular characteristics of cable insulating materials |
| 24 | 10.2 Accessories 11 Type tests — Summary 11.1 General |
| 25 | 11.2 Range of type approval for cables 11.3 Range of type approval for accessories |
| 26 | 11.4 Summary of type approval tests Table 5 — Type tests on cable components |
| 27 | 12 Electrical type tests on cables 12.1 Electrical tests on complete cable 12.2 Sequence of tests 12.3 Special provisions |
| 28 | 12.4 Check on insulation thickness of cable for electrical type tests 12.5 Bending test 12.6 Partial discharge test |
| 29 | 12.7 Tan δ measurement as a function of the voltage and capacitance measurement Table 6 — Tan δ in relation to voltage 12.8 Tan δ measurement at high temperature 12.9 Heating cycle voltage test |
| 30 | 12.10 Impulse voltage test 12.11 Power frequency voltage test Table 7 — Power frequency voltage test 12.12 Cable examination |
| 31 | 13 Type tests on cable components 13.1 Check of cable construction 13.2 Ageing tests on pieces of complete cable to check compatibility of materials |
| 32 | Table 8 — Tests and requirements for mechanical characteristics of XLPE insulating material before and after ageing Table 9 — Test requirements for particular characteristics of oversheathing for cables |
| 33 | 13.3 Tests for determining the mechanical properties of insulation and oversheathing before and after ageing 13.4 Pressure test at high temperature on oversheaths 13.5 Test on PVC oversheaths (ST1 and ST2) at low temperature |
| 34 | 13.6 Loss of mass test on PVC oversheaths of type ST2 13.7 Heat shock test for PVC oversheaths (ST1 and ST2) 13.8 Visual examination of semi-conducting screens 13.9 Hot set test for XLPE insulation |
| 35 | 13.10 Measurement of carbon black content of black PE oversheaths (ST3 and ST7) 13.11 Shrinkage test for cable insulation Figure 1 — Shrinkage test 13.12 Shrinkage test on polyethylene sheath 13.13 Test under fire conditions 14 Longitudinal water penetration type test on complete cables 14.1 Sampling |
| 36 | Figure 2 — Schematic diagram of apparatus of water penetration test 14.2 Procedure |
| 37 | 14.3 Requirement 14.4 Additional procedure for phase conductor 15 Mechanical and thermal type tests on complete cables 15.1 General 15.2 Impact test 15.3 Abrasion, penetration, bending and saline bath tests on anti-corrosion coverings for self-contained cables |
| 39 | Figure 3 — Toothed wheel: 15 teeth |
| 40 | Figure 4 — Possible arrangement of sample in saline bath 15.4 Corrosion penetration test for aluminium sheathed cables |
| 41 | 15.5 Internal thermal resistance of complete cable |
| 42 | 16 Type tests on accessories 16.1 General 16.2 Tests and requirements |
| 43 | 16.3 Partial discharge test 16.4 Load cycle voltage test 16.5 Impulse voltage test 16.6 Power frequency voltage test 16.7 Examination 16.8 Tests on buried joints |
| 44 | Table 10 — Lightning impulse voltage test levels |
| 45 | 16.9 Test for accessories with mechanical connections to sheath or screen wires |
| 46 | 16.10 SF6 switchgear cable connections 17 Type tests on ancillary equipment 18 Electrical tests after installation 18.1 Testing of insulation (cable and accessory) Table 11 — A.C. test voltages 18.2 Verification of specially bonded sheath systems |
| 47 | Table 12 — Maximum contact resistance values 18.3 Verification of positive phase and zero sequence impedance |
| 49 | 18.4 D.C. conductor resistance test 18.5 Voltage test on sheath insulation 18.6 Test on sheath voltage limiters |
| 50 | Table 13 — Voltage and current range for maintenance test on silicon carbide units |
| 51 | Annex A (normative) Tests and requirements for cable bonding leads |
| 52 | Table A.1 — Examples of the construction of single core bonding leads |
| 53 | Table A.2 — Examples of the construction of concentric bonding leads |
| 55 | Table A.3 — Test voltages for bonding leads Table A.4 — Conductor d.c. resistance |
| 56 | Annex B (normative) Tests and requirements for sheath voltage limiters (SVLs) |
| 58 | Annex C (normative) Tests and requirements for link housings |
| 61 | Annex D (normative) Additional water blocking test for phase conductor |
| 62 | Figure D.1 — Apparatus for water penetration test |
| 63 | Bibliography |
