IEC 61936-1 pdf download

IEC 61936-1 pdf download.Power installations exceeding 1 kV a.c. – Part 1: Common rules
1 Scope
This part of IEC 61 936 provides common rules for the design and the erection of electrical power installations in systems with nominal voltages above 1 kV a.c. and nominal frequency up to and including 60 Hz, so as to provide safety and proper functioning for the use intended. For the purpose of interpreting this standard, an electrical power installation is considered to be one of the following: a) Substation, including substation for railway power supply b) Electrical installations on mast, pole and tower Switchgear and/or transformers located outside a closed electrical operating area c) One (or more) power station(s) located on a single site The installation includes generators and transformers with all associated switchgear and all electrical auxiliary systems. Connections between generating stations located on different sites are excluded. d) The electrical system of a factory, industrial plant or other industrial, agricultural, commercial or public premises The electrical power installation includes, among others, the following equipment: – rotating electrical machines; – switchgear; – transformers and reactors; – converters; – cables; – wiring systems; – batteries; – capacitors; – earthing systems; – buildings and fences which are part of a closed electrical operating area; – associated protection, control and auxiliary systems; – large air core reactor. NOTE In general, a standard for an item of equipment takes precedence over this standard. This standard does not apply to the design and erection of any of the following: – overhead and underground lines between separate installations; – electric railways; – mining equipment and installations; – fluorescent lamp installations; – installations on ships and off-shore installations; – electrostatic equipment (e.g. electrostatic precipitators, spray-painting units);– test sites; – medical equipment, e.g. medical X-ray equipment. This standard does not apply to the design of factory-built, type-tested switchgear for which separate IEC standards exist. This standard does not apply to the requirements for carrying out live working on electrical installations. If not otherwise required in this standard, for low-voltage electrical installations the standard series IEC 60364 applies.
3 Terms and definitions
For the purposes of this document, the following definitions apply. 3.1 General definitions 3.1 .1 electrical equipment item used for such purposes as generation, conversion, transmission, distribution or utilization of electric energy, such as electric machines, transformers, switchgear and controlgear, measuring instruments, protective devices, wiring systems, current-using equipment [IEC 60050-826:2004, 826-1 6-01 ] 3.1 .2 nominal value value of a quantity used to designate and identify a component, device, equipment or system [IEC 60050-1 51 :2001 , 1 51 -1 6-09] 3.1 .3 nominal voltage of a system suitable approximate value of voltage used to designate or identify a system [IEC 60050-601 :1 985, 601 -01 -21 ] 3.1 .4 rated value value of a quantity used for specification purposes, established for a specified set of operating conditions of a component, device, equipment, or system [IEC 60050-1 51 :2001 , 1 51 -1 6-08] 3.1 .5 highest voltage for installation highest r.m.s value of phase-to-phase voltage for which the installation is designed in respect of its insulation 3.1 .6 tested connection zone zone in the vicinity of equipment terminals which has passed a dielectric type test with the appropriate withstand value(s), the applicable conductors being connected to the terminals in a manner specified by the manufacturer of the equipment 3.1 .7 isolating distance clearance between open contacts meeting the safety requirements specified for disconnectors [IEC 60050-441 :1 984, 441 -1 7-35] 3.1 .8 isolation switching off or disconnection of an installation, a part of an installation or an equipment from all non-earthed conductors by creating isolating gaps or distances 3.1 .9 live part conductor or conductive part intended to be energized in normal operation, including a neutral conductor, but by convention not a PEN conductor or PEM conductor or PEL conductor [IEC 60050-1 95:1 998, 1 95-02-1 9] NOTE 1 This concept does not necessarily imply a risk of electric shock. NOTE 2 For definitions of PEM and PEL see IEC 60050-1 95:1 998, 1 95-02-1 3 and IEC 60050-1 95:1 998, 1 95-02- 1 4. 3.1 .1 0 feeder electric line originating at a main substation and supplying one or more secondary substations, or one or more branch lines, or any combination of these two types of installations [IEC 60050-601 :1 985, 601 -02-08, modified] 3.1 .1 1 ferro-resonance resonance of the capacitance of an apparatus with the inductance of the saturable magnetic circuit of an adjacent apparatus [IEC 60050-604:1 987, 604-01 -1 4]