BS 7923:2004
$142.49
Electric cables. Internal gas-pressure cables and accessories for alternating voltages up to and including 275 kV (Um = 300 kV). Requirements and test methods
| Published By | Publication Date | Number of Pages |
| BSI | 2004 | 30 |
This British Standard specifies tests and requirements for radial-field impregnated-paper-insulated cables and accessories in which, during normal operation, a gas pressure exceeding 1.2 MPa (12 bar) gauge is applied internally, i.e. with the gas in direct contact with the insulation.
It also specifies tests for cables and accessories intended for use in systems with a nominal voltage not exceeding 275 kV between phases.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD |
| 2 | Committees responsible for this British�Standard |
| 3 | Contents |
| 5 | 1 Scope 2 Normative references 3 Terms and definitions 3.1 rated voltage 3.2 rated voltage 3.3 maximum voltage 3.4 peak voltage 4 Voltage designation |
| 6 | 5 Characteristics |
| 7 | 6 Test categories, frequency and conditions 6.1 Categories of tests 6.2 Frequency of tests 6.3 Test conditions |
| 8 | 7 Routine tests on cables 7.1 General 7.2 Conductor resistance test 7.3 Capacitance test 7.4 Tan ¸ measurement test |
| 9 | Table 1 Tan 7.5 High-voltage test Table 2 High voltage test values 7.6 Test on oversheath 8 Sample tests on cables 8.1 Measurement of thickness |
| 10 | 8.2 Bending test Table 3 Diameter of the test cylinder |
| 11 | 8.3 Quality of insulation paper 9 Routine tests on accessories 9.1 General 9.2 Joint sleeves and porcelain assemblies |
| 12 | 9.3 Gas regulators 9.4 Safety valves 10 Sample tests on accessories 10.1 Procedure 10.2 Requirement 11 Type tests on cables and accessories 11.1 General 11.2 Electrical test sequence |
| 13 | 11.3 Cold tan�¸ measurement/voltage test 11.4 Three-cycle bend test |
| 14 | 11.5 Load cycle voltage test |
| 16 | 11.6 Thermal stability test 11.7 Switching impulse voltage test |
| 17 | Table 4 Waveshape Table 5 Voltage levels |
| 18 | 11.8 Lightning impulse voltage test table 6 Lightning impulse test voltage levels |
| 19 | 11.9 Dielectric security test 12 Non-electrical type tests on cables 12.1 General 12.2 Internal thermal resistance of complete cable 12.3 Test on pressure-retaining sheath |
| 20 | 12.4 Test on tail cable sheaths |
| 21 | 12.5 Oversheath tests |
| 22 | 13 Non-electrical type tests on accessories 13.1 General 13.2 Buried joints |
| 23 | Table 7 Impulse voltage level requirements 13.3 Outdoor terminations Table 8 Test voltages for salt fog test |
| 24 | 13.4 Gas-immersed terminations 14 Tests after installation 14.1 High voltage d.c. test Table 9 High voltage test levels |
| 25 | 14.2 Conductor d.c. resistance 14.3 Voltage test on oversheath and other sheath insulation 14.4 Sheath voltage limiters 14.5 Link contact resistance test 14.6 Positive and zero sequence impedances |
| 27 | 14.7 Pneumatic test |
