AS IEC 60437—2005 pdf – Radio interference test on high-voltage insulators

AS IEC 60437—2005 pdf – Radio interference test on high-voltage insulators.
1 Scope This International Standard specifies the procedure for a radio interference (RI) test carried out in a laboratory on clean and dry insulators at a frequency of 0,5 MHz or 1 MHz or, alternatively, at other frequencies between 0,5 MHz and 2 MHz. In service the RI characteristics of an insulator may be modified by the ambient conditions, particularly rainfall and other moisture, and by pollution. It is not considered feasible to specify reproducible test conditions to simulate a range of ambient conditions. Hence only tests on clean and dry insulators are specified in this standard. NOTE – The effects of insulator surface conditions, including pollution, are presented in Amendment 1 of CISPR 1 8-2. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. 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 edition of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. References to international standards that are struck through in this clause are replaced by references to Australian or Australian/New Zealand Standards that are listed immediately thereafter and identified by shading. Any Australian or Australian/New Zealand Standard that is identical to the International Standard it replaces is identified as such. IEC 60050(471 ):1 984, International Electrotechnical Vocabulary (IEV) – Chapter 471: Insulators AS 1 852.471 , International electrotechnical vocabulary—Insulators (identical to IEC 60050(471 ):1 984)
6 Measuring instruments 6.1 Standard CISPR measuring apparatus Unless otherwise agreed, the standard CISPR measuring apparatus, as specified in CISPR 1 6-1 , shall be used for all measurements of RI characteristics of insulators. 6.2 Other measuring apparatus By agreement between the purchaser and manufacturer measuring apparatus differing from the CISPR standard measuring apparatus may be used provided that conversion of the measurements to quasi peak values is possible. 7 Measuring circuit Laboratory measurements of radio noise shall be made by measuring the conducted quantities, either current or voltage. The relevant measuring circuits are specified in CISPR 1 8-2. The basic test circuit is shown in figure 4 of CISPR 1 8-2, and a practical form of standard test circuit in figure 5. Depending on the distance between the measuring set and the test circuit, the arrangements shown in figure 6 or figure 7 of CISPR 1 8-2 may be incorporated into the test circuit of figure 5. 8 Requirements for the test voltage RI measurements shall be made with a power-frequency voltage applied to the test object. The test voltage and its method of measurement shall comply with the requirements of IEC 60060-1 . The radio noise level produced by the connections between the transformer and test insulator shall be insignificant compared with the levels to be measured from the test object at the test voltage.
9 Atmospheric conditions The standard reference atmospheric conditions in accordance with IEC 60060-1 are not applicable to radio interference tests. Tests made in accordance with this standard shall be performed under atmospheric conditions complying with the following requirements: – temperature between 1 0°C and 35°C – pressure between 87 kPa and 1 07 kPa (870 mbar and 1 070 mbar) – relative humidity between 45% and 75%. NOTE 1 – The absolute humidity and the atmospheric pressure can influence the test results. NOTE 2 – By agreement between the purchaser and manufacturer, e.g. to simulate service conditions, tests may be carried out under other atmospheric conditions. Examples of these include: – temperature between 5°C and 40°C – relative humidity between 20% and 80%. Correction to standard atmospheric conditions shall not be applied to either the test voltage or the radio interference measurements. The atmospheric conditions shall be recorded.