{"id":242425,"date":"2024-10-19T15:53:29","date_gmt":"2024-10-19T15:53:29","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-79122012a12017\/"},"modified":"2024-10-25T10:46:10","modified_gmt":"2024-10-25T10:46:10","slug":"bs-79122012a12017","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-79122012a12017\/","title":{"rendered":"BS 7912:2012+A1:2017"},"content":{"rendered":"

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<\/i> m<\/sub> = 72.5 kV) to 132 kV (U<\/i> m<\/sub> = 145 kV) for fixed installations.<\/p>\n

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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<\/b>.<\/p>\n<\/blockquote>\n

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.<\/p>\n

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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.<\/p>\n<\/blockquote>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
6<\/td>\nForeword <\/td>\n<\/tr>\n
9<\/td>\n1 Scope
2 Normative references <\/td>\n<\/tr>\n
10<\/td>\n3 Terms and definitions <\/td>\n<\/tr>\n
11<\/td>\n4 Voltage designation and cable design features
4.1 Voltage designation <\/td>\n<\/tr>\n
12<\/td>\nTable 1 \u2014 Test voltages <\/td>\n<\/tr>\n
13<\/td>\n4.2 Cable maximum temperatures
Table 2 \u2014 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 <\/td>\n<\/tr>\n
14<\/td>\n5 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 <\/td>\n<\/tr>\n
15<\/td>\n7 Accessory characteristics
8 Test conditions
8.1 Ambient temperature <\/td>\n<\/tr>\n
16<\/td>\n8.2 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 <\/td>\n<\/tr>\n
17<\/td>\n9.3 Voltage test
9.4 Electrical test on oversheath of the cable
10 Sample tests
10.1 Cables
Table 3 \u2014 Number of samples for sample tests <\/td>\n<\/tr>\n
18<\/td>\nTable 4 \u2014 Test conditions and requirements for particular characteristics of cable insulating materials <\/td>\n<\/tr>\n
24<\/td>\n10.2 Accessories
11 Type tests \u2014 Summary
11.1 General <\/td>\n<\/tr>\n
25<\/td>\n11.2 Range of type approval for cables
11.3 Range of type approval for accessories <\/td>\n<\/tr>\n
26<\/td>\n11.4 Summary of type approval tests
Table 5 \u2014 Type tests on cable components <\/td>\n<\/tr>\n
27<\/td>\n12 Electrical type tests on cables
12.1 Electrical tests on complete cable
12.2 Sequence of tests
12.3 Special provisions <\/td>\n<\/tr>\n
28<\/td>\n12.4 Check on insulation thickness of cable for electrical type tests
12.5 Bending test
12.6 Partial discharge test <\/td>\n<\/tr>\n
29<\/td>\n12.7 Tan \u03b4 measurement as a function of the voltage and capacitance measurement
Table 6 \u2014 Tan \u03b4 in relation to voltage
12.8 Tan \u03b4 measurement at high temperature
12.9 Heating cycle voltage test <\/td>\n<\/tr>\n
30<\/td>\n12.10 Impulse voltage test
12.11 Power frequency voltage test
Table 7 \u2014 Power frequency voltage test
12.12 Cable examination <\/td>\n<\/tr>\n
31<\/td>\n13 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 <\/td>\n<\/tr>\n
32<\/td>\nTable 8 \u2014 Tests and requirements for mechanical characteristics of XLPE insulating material before and after ageing
Table 9 \u2014 Test requirements for particular characteristics of oversheathing for cables <\/td>\n<\/tr>\n
33<\/td>\n13.3 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 <\/td>\n<\/tr>\n
34<\/td>\n13.6 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 <\/td>\n<\/tr>\n
35<\/td>\n13.10 Measurement of carbon black content of black PE oversheaths (ST3 and ST7)
13.11 Shrinkage test for cable insulation
Figure 1 \u2014 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 <\/td>\n<\/tr>\n
36<\/td>\nFigure 2 \u2014 Schematic diagram of apparatus of water penetration test
14.2 Procedure <\/td>\n<\/tr>\n
37<\/td>\n14.3 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 <\/td>\n<\/tr>\n
39<\/td>\nFigure 3 \u2014 Toothed wheel: 15 teeth <\/td>\n<\/tr>\n
40<\/td>\nFigure 4 \u2014 Possible arrangement of sample in saline bath
15.4 Corrosion penetration test for aluminium sheathed cables <\/td>\n<\/tr>\n
41<\/td>\n15.5 Internal thermal resistance of complete cable <\/td>\n<\/tr>\n
42<\/td>\n16 Type tests on accessories
16.1 General
16.2 Tests and requirements <\/td>\n<\/tr>\n
43<\/td>\n16.3 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 <\/td>\n<\/tr>\n
44<\/td>\nTable 10 \u2014 Lightning impulse voltage test levels <\/td>\n<\/tr>\n
45<\/td>\n16.9 Test for accessories with mechanical connections to sheath or screen wires <\/td>\n<\/tr>\n
46<\/td>\n16.10 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 \u2014 A.C. test voltages
18.2 Verification of specially bonded sheath systems <\/td>\n<\/tr>\n
47<\/td>\nTable 12 \u2014 Maximum contact resistance values
18.3 Verification of positive phase and zero sequence impedance <\/td>\n<\/tr>\n
49<\/td>\n18.4 D.C. conductor resistance test
18.5 Voltage test on sheath insulation
18.6 Test on sheath voltage limiters <\/td>\n<\/tr>\n
50<\/td>\nTable 13 \u2014 Voltage and current range for maintenance test on silicon carbide units <\/td>\n<\/tr>\n
51<\/td>\nAnnex A (normative)\u2002 Tests and requirements for cable bonding leads <\/td>\n<\/tr>\n
52<\/td>\nTable A.1 \u2014 Examples of the construction of single core bonding leads <\/td>\n<\/tr>\n
53<\/td>\nTable A.2 \u2014 Examples of the construction of concentric bonding leads <\/td>\n<\/tr>\n
55<\/td>\nTable A.3 \u2014 Test voltages for bonding leads
Table A.4 \u2014 Conductor d.c. resistance <\/td>\n<\/tr>\n
56<\/td>\nAnnex B (normative)\u2002 Tests and requirements for sheath voltage limiters (SVLs) <\/td>\n<\/tr>\n
58<\/td>\nAnnex C (normative)\u2002 Tests and requirements for link housings <\/td>\n<\/tr>\n
61<\/td>\nAnnex D (normative)\u2002 Additional water blocking test for phase conductor <\/td>\n<\/tr>\n
62<\/td>\nFigure D.1 \u2014 Apparatus for water penetration test <\/td>\n<\/tr>\n
63<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Power cables with XLPE insulation and metal sheath, and their accessories, for rated voltages from 66 kV (Um<\/sub> = 72.5 kV) to 132 kV (Um<\/sub> = 145 kV)<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2017<\/td>\n64<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":242429,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[493,2641],"product_tag":[],"class_list":{"0":"post-242425","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-29-060-20","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/242425","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/242429"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=242425"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=242425"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=242425"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}