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Actions Shares. Embeds 0 No embeds. No notes for slide. IEC 1. Missing page numbers correspond to the French- language pages. Publication numbering As from 1 January all IEC publications are issued with a designation in the series. Consolidated editions The IEC is now publishing consolidated versions of its publications. For example, edition numbers 1. Information relating to this publication, including its validity, is available in the IEC Catalogue of publications see below in addition to new editions, amendments and corrigenda.
On-line information is also available on recently issued publications, withdrawn and replaced publications, as well as corrigenda. Please contact the Customer Service Centre see below for further information.
The object of the IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields.
Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization for Standardization ISO in accordance with conditions determined by agreement between the two organizations. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter.
The IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC has been prepared by subcommittee 17A: High-voltage switchgear and controlgear, and subcommittee 17C: High-voltage enclosed switchgear and controlgear, of IEC technical committee Switchgear and controlgear.
It bears the edition number 2. A vertical line in the margin shows where the base publication has been modified by amendment 1, amendment 2 and the corrigenda. Annexes A, B and C form an integral part of this standard. Annexes D to H are for information only. The following differences exist in some countries: 6. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below.
They are listed in annex G. If the actual service conditions differ from these normal service conditions, high-voltage switchgear and controlgear and associated operating devices and auxiliary equipment shall be designed to comply with any special service conditions required by the user, or appropriate arrangements shall be made see 2.
NOTE 1 Appropriate action should also be taken to ensure proper operation under such conditions of other components, such as relays. For these conditions, condensation may occasionally occur. NOTE 1 Condensation can be expected where sudden temperature changes occur in periods of high humidity. NOTE 2 To withstand the effects of high humidity and condensation, such as breakdown of insulation or corrosion of metallic parts, switchgear designed for such conditions and tested accordingly should be used.
NOTE 3 Condensation may be prevented by special design of the building or housing, by suitable ventilation and heating of the station or by the use of dehumidifying equipment. NOTE 4 The maximum induced voltage values may be exceeded at interfaces to instrument transformers. Refer to instrument transformer standards for adequate performances of these devices. Rapid temperature changes should be taken into account.
NOTE 1 Under certain conditions of solar radiation appropriate measures, e. NOTE 5 The maximum induced voltage values may be exceeded at interfaces to instrument transformers. NOTE 1 For internal insulation, the dielectric characteristics are identical at any altitude and no special precautions need to be taken.
For external and internal insulation, see IEC NOTE 2 For low-voltage auxiliary and control equipment, no special precautions need to be taken if the altitude is lower than 2 m. For higher altitude, see IEC In certain regions with frequent occurrence of warm humid winds, sudden changes of temperature may occur resulting in condensation even indoors.
Some of them are recalled hereunder for easier use. The definitions given below are also applicable. They are classified in accordance with IEC The definitions of IEC are not repeated but reference is made to their specific sub-clause number. NOTE 2 "Failure" is an event, as distinguished from "fault", which is a state. NOTE 3 This concept as defined does not apply to items consisting of software only. They are related to different cases of application.
The reference given above is to be applied in the present case. If this is not the case, a test specimen is one pole of the complete switchgear and controlgear. Where permitted in the relevant IEC standard, a test specimen may be a representative sub- assembly It is not normally removed after the equipment is put in service 3. It is also capable of carrying currents under normal circuit conditions and carrying currents for a specified time under abnormal conditions such as those of short-circuit.
A subassembly is normally placed in a separate enclosure, and shall have its own interface An interchangeable subassembly has an accessible interface 3. In the case of mechanical auxiliary contacts, this sensing element can be simply the fixed contact, directly connected to the secondary terminal. In the case where the function is achieved electronically, the sensing element can be a static transducer optical, magnetic, etc. This pressure is often designated as interlocking pressure 3.
NOTE Several gas-filled compartments may be permanently interconnected to form a common gas-system gas- tight assembly. NOTE 2 A volume may consist of several permanently connected gas-filled compartments. NOTE 2 Sealed pressure systems are completely assembled and tested in the factory. It is expressed in percentage per year or per day 3.
This value is applicable to controlled pressure systems 3. Standard values of rated voltages are given below: NOTE For editorial reasons, mainly due to the characteristics of the transient recovery voltages, the subdivision in voltage ranges differs from that in IEC In these tables, the withstand voltage applies at the standardized reference atmosphere temperature, pressure and humidity specified in IEC For special service conditions, see 2.
The rated withstand voltage values for lightning impulse voltage Up , switching impulse voltage Us when applicable , and power-frequency voltage Ud shall be selected without crossing the horizontal marked lines. The rated insulation level is specified by the rated lightning impulse withstand voltage phase to earth. For most of the rated voltages, several rated insulation levels exist to allow for application of different performance criteria or overvoltage patterns.
The choice should be made considering the degree of exposure to fast-front and slow-front overvoltages, the type of neutral earthing of the system and the type of overvoltage limiting devices see IEC The "common values" as used in tables 1a and 1b apply to phase-to-earth, between phases and across the open switching device, if not otherwise specified in this standard.
The withstand voltage values "across the isolating distance" are valid only for the switching devices where the clearance between open contacts is designed to meet the safety requirements specified for disconnectors. For further information about insulation levels, see annex D. See 9.
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