They are chosen in such a way that the insulation design will be determined mainly by the ability of the external insulation to withstand the switching impulse test voltages; c in a few extreme cases, provision should be made for a higher value of lightning impulse withstand voltage. We accept all major credit cards American Express, Mastercard and Visa , PayPal and bank transfers as form of payment. This higher value shall be chosen from the series of standard values given in 5. The requirements for human safety are not covered by this standard. It has the status of a horizontal standard in accordance with IEC Guide This association is for insulation co-ordination purposes only.
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This higher value shall be chosen from the series of standard values given in 5. The following test report forms are related: The test conversion factors are determined from existing results to provide a conservative iec 60071-1 for the rated withstand voltages.
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Related publications IEC This association is for insulation co-ordination purposes only. The main changes from the previous edition are as follows: It specifies the procedure for the selection of iec 60071-1 rated withstand voltages for the phase-to-earth, phase-to-phase and longitudinal insulation of the equipment and the installations of these systems.
When more than one set of standard rated withstand voltages is associated with the same highest voltage for equipment, guidance is provided iec 60071-1 the selection of the most suitable set. They are chosen by taking into account the ratio of lightning impulse protective level to switching impulse protective level likely to be achieved with surge arresters, and by adding appropriate margins; b for equipment not protected by surge arresters or not effectively protectedonly the higher iec 60071-1 of lightning impulse withstand voltages shall be used.
Preview Abstract IEC These higher values are based on the typical ratio of the lightning and switching impulse withstand voltages of the external insulation of apparatus e.
IEC 60071 1
In order to meet these general requirements, the required withstand voltages should be converted to those voltage shapes for which standard rated withstand voltages are specified using test conversion factors. Iec 60071-1 IECApplication Guide, all rules for insulation co ordination given in this standard are justified in detail, in particular the association of the standard rated withstand voltages with the highest voltage for equipment.
Although the principles of this standard also apply to transmission line insulation, the values of their withstand voltages may be different from the standard rated withstand voltages. Our prices are in Swiss francs CHF. The selection of a particular 600771-1 insulation level should be based on the insulation co- ordination procedure in accordance with the insulation co-ordination procedure described in IEC third edition and should take irc account iec 60071-1 insulation characteristics of the particular equipment being considered.
This standard recommends that the selected withstand voltages should iec 60071-1 associated with the highest iec 60071-1 for equipment. It has the status of a horizontal standard in accordance with IEC Guide The requirements for human safety are iec 60071-1 covered by this standard. The apparatus committees are responsible for specifying the rated withstand voltages and the test procedures suitable for the relevant equipment taking into iec 60071-1 the recommendations of this standard.
Enviado por Rafael flag Denunciar. IEC leaves it to the relevant apparatus committee to prescribe a long-duration power-frequency test intended to demonstrate the response of the equipment with respect to ageing of internal insulation or to external pollution see also IEC They are chosen in such a way that the insulation design will be determined mainly by the ability of the external insulation to withstand the switching impulse test voltages; ie in a few extreme cases, provision should be made for a higher value of lightning impulse withstand voltage.
In range I, the standard rated short-duration power-frequency or the standard rated lightning impulse withstand voltage should cover the ifc switching impulse withstand voltages phase-to-earth and phase-to-phase as well as the required longitudinal withstand voltage.
It also gives the lists of the standard withstand voltages from which the rated withstand voltages should be selected. We accept all major credit cards American Express, Mastercard and VisaPayPal and iec 60071-1 transfers as form of payment. Do you need a multi-user copy? In range II, the standard rated switching impulse withstand voltage should cover the required short-duration power-frequency withstand voltage if no value is required by the relevant apparatus committee.