bsen50483-5-20xxtestrequirementsforlowvoltageaerialbundledcableaccessories—part5electricalage

bsen50483-5-20xxtestrequirementsforlowvoltageaerialbundledcableaccessories—part5electricalage内容摘要：

s For the purposes of this document, the terms and definitions given in IEC 60050461 and the following apply. adiabatic occurring with no addition or loss of heat from the system under consideration aerial bundled cable (ABC) aerial cable consisting of a group of insulated conductors which are twisted together including, or not, a non insulated conductor [IEV 4610802, modified] NOTE The terms bundled conductors, bundled cables, bundled cores, conductor bundles and bundle could be used as equivalent to the term aerial bundled cable (ABC). aerialinsulatedcable insulated cable designed to be suspended overhead and outdoors [IEV 4610801] branch connector metallic device for connecting a branch conductor to a main conductor at an intermediate point on the latter [IEV 4611705] branch conductor conductor connected to the main conductor by a connector conductor insulation insulation applied on a conductor [IEV 4610202, modified] conductor (of a cable) part of a cable which has the specific function of carrying current [IEV 4610101] connector metallic device to connect cable conductors together [IEV 4611703] core assembly prising conductor and its own insulation [IEV 4610404, modified] equalizer arrangement used in the test loop to ensure a point of equipotential in a stranded conductor [EN 612381:2020, ] BS EN 504835:2020 EN 504835:2020 – 6 – insulation (of a cable) insulating materials incorporated in a cable with the specific function of withstanding voltage [IEV 4610201] insulation piercing connector (IPC) connector in which electrical contact with the conductor is made by metallic protrusions which pierce the insulation of the ABC core [IEV 4611108, modified] median connector connector which during the first heat cycle records the third highest temperature of the six connectors in the test loop [EN 612381:2020, ] preinsulated (terminal) lug insulated metallic device for connecting an insulated cable conductor to other electrical equipment preinsulated through connector (sleeve) insulated metallic device for connecting two consecutive lengths of insulated conductors reference conductor length of conductor(s) without any joints, which is included in the test loop and which enables the reference temperature and reference resistance(s) to be determined reusable connector connector for connecting ABC to stripped cable or bare conductor where only the branch connection can be reused sheath uniform and continuous tubular covering of metallic or non metallic material, generally extruded [IEV 4610503] shear head head of a bolt, or a device fitted over the head of a bolt or a nut, which is designed to break at a specified torque type test test required to be made before supplying a type of material covered by this standard on a general mercial basis, in order to demonstrate satisfactory performance characteristics to meet the intended application NOTE These tests are of such a nature that, after they have been made, they need not be repeated unless changes are made to the accessory materials, design or type of manufacturing process which might change the performance characteristics. BS EN 504835:2020 EN 504835:2020 – 7 – 4 Symbols A, A1, A2 electrical crosssectional area of the conductors D conductor diameter DEq equalizer diameter d conductor length between connectors I direct current flowing through a connection during resistance measurement Irm s equivalent . shortcircuit current IN alternating current necessary to maintain the reference conductor at its equilibrium temperature la, lb, lj lengths of the conductor assembly associated with the measurement points after jointing le length of equalizer lr, lra , lrb length of the reference conductor between measurement points R1, R2 linear resistance of conductors of respectively crosssection A1 and A2 R20 , Rra, Rrb the calculated resistance between two equalizers and corrected to 20 176。 C TC thermocouple t1 heating period within heat cycle t2 cooling period within heat cycle t1 a time period to reach the required temperature on the reference cable t1 b time period of stable temperature on the median connector UA B potential difference between measurement points of reference conductor of crosssection A1 UCD potential difference between measurement points of the connector UEF potential difference between measurement points of reference conductor of crosssection A2 α temperature coefficient of resistance at 20 176。 C β mean scatter of the connector resistance factors ∆θj temperature difference between reference cable and connector δ initial scatter of the connector resistance factors BS EN 504835:2020 EN 504835:2020 – 8 – λ resistance factor ratio。 change in the resistance of the connector relative to its initial resistance θ temperature of a connector while measuring resistances θmax maximum temperature recorded on a connector over the total period of test θN highest rated temperature of insulating pound in normal operation θR temperature of the reference conductor determined in the first heat cycle θr temperature of the reference conductor while measuring resistances θref temperature of the reference conductor at the moment of measuring θm a x 5 Type test Principle Connectors shall be subjected to 1 000 cycles of heating and cooling. The cold resistance of the connectors shall be measured at specific steps to。