IEC 61442-2005 pdf – Test methods for accessories for power cables with rated voltages from 6 kV (U m = 7,2 kV) up to 30 kV (U m = 36 kV)

IEC 61442-2005 pdf – Test methods for accessories for power cables with rated voltages from 6 kV (U m = 7,2 kV) up to 30 kV (U m = 36 kV).
1 Scope This International Standard specifies the test methods to be used for type testing accessories for power cables with rated voltage from 3,6/6 (7,2) kV up to 18/30 (36) kV. Test methods are specified for accessories for extruded and paper insulated cables according to IEC 60502-2 and IEC 60055-1 respectively. 2 Normative references 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 document (including amendments) applies. IEC 60055-1: Paper-insulated metal-sheathed cables for rated voltages up to 18/30 kV (with copper or aluminium conductors and excluding gas-pressure and oil-filled cables) – Part 1: Tests on cables and their accessories IEC 60060-1:1989, High-voltage test techniques – Part 1: General definitions and test requirements IEC 60230:1966, Impulse tests on cables and their accessories IEC 60270:2000, High-voltage test techniques – Partial discharge measurements IEC 60502-2:2005, Power cables with extruded insulation and their accessories for rated voltages from 1 kV (U m = 1,2 kV) up to 30 kV (U m = 36 kV) – Part 2: Cables for rated voltages from 6 kV (U m = 7,2 kV) up to 30 kV (U m = 36 kV) IEC 60811-1-2:1985, Common test methods for insulating and sheathing materials of electric and optical cables – Part 1: Methods for general application – Section Two: Thermal ageing methods IEC 60885-3:1988, Electrical test methods for electric cables – Part 3: Test methods for partial discharge measurements on lengths of extruded power cables IEC 60986:2000, Short-circuit temperature limits of electric cables with rated voltages from 6 kV (U m = 7,2 kV) up to 30 kV (U m = 36 kV) IEC 61238-1:2003, Compression and mechanical connectors for power cables for rated voltages up to 30 kV (U m = 36 kV) – Part 1: Test methods and requirements
3 Test installations and conditions 3.1 The test methods described in this standard are intended to be used for type tests. 3.2 Test arrangements and the number of test samples are given in the relevant standard. 3.3 The test conditions are specified in Clauses 4 to 20 of this standard. When they are not, they shall be as specified in the relevant standards. 3.4 Unless otherwise stated, the testing parameters and the requirements are given in the relevant standard. 3.5 For transition joints (either extruded insulation to extruded insulation or extruded insulation to paper insulation), the testing parameters (voltage and conductor temperature) are those for the lower rated cable. 3.6 The tests shall be started not less than 24 h after the installation of the accessories on the cable test loops, unless otherwise specified by the manufacturer. The time interval shall be recorded in the test report. 3.7 Cable screens, and armour if any, shall be bonded and earthed at one end only to prevent circulating currents. 3.8 All parts of an accessory which are normally earthed shall be connected to the cable screen. Any supporting metalwork shall also be earthed. 3.9 Ambient temperature shall be (20 ± 15) °C. 3.10 Tap water shall be used for all tests in water. 4 AC voltage tests 4.1 Dry test for all accessories 4.1.1 Installation The set(s) of accessories shall be erected with all associated metalwork and fittings. The accessories shall be clean and dry before applying the test voltage. 4.1.2 Method Unless otherwise specified, the test shall be made at ambient temperature, and the procedure for voltage application shall be as specified in Section 5 of IEC 60060-1.
4.2.2 Method Unless otherwise specified, the wet test method is as described in 9.1 of IEC 60060-1, and shall be carried out at ambient temperature. 4.3 Test in water for stop ends 4.3.1 Installation The stop ends shall be installed in a water tank of such dimensions as to have a height of water of 1,00 02 , 0 0 + m over their top surface, unless otherwise specified. The water shall be at ambient temperature. 4.3.2 Method Unless otherwise specified, the procedure for voltage application shall be as specified in IEC 60060-1. 5 DC voltage tests 5.1 Installation The set(s) of accessories shall be erected with all associated metalwork and fittings. The accessories shall be clean and dry before applying the test voltage. 5.2 Method A voltage of negative polarity shall be applied to the cable conductor. The test shall be made at ambient temperature and the procedure for voltage application shall be as specified in Section 4 of IEC 60060-1. 6 Impulse voltage tests 6.1 Installation For preparation of the test installation, involving metal enclosures and terminal boxes, reference shall be made to the relevant standard. In the case of three-core accessories (such as three single-core terminations in an enclosure), one phase shall be tested at a time, with the other two phases earthed.