DIN 53483-3-1969 Testing of Insulating Materials Determination of Dielectric Properties Measuring Cells for Liquids for Frequencies up to 100 MHz《绝缘材料的检验 介电性能的测定 频率100MHz 以下液体用测量光电.pdf
《DIN 53483-3-1969 Testing of Insulating Materials Determination of Dielectric Properties Measuring Cells for Liquids for Frequencies up to 100 MHz《绝缘材料的检验 介电性能的测定 频率100MHz 以下液体用测量光电.pdf》由会员分享,可在线阅读,更多相关《DIN 53483-3-1969 Testing of Insulating Materials Determination of Dielectric Properties Measuring Cells for Liquids for Frequencies up to 100 MHz《绝缘材料的检验 介电性能的测定 频率100MHz 以下液体用测量光电.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、DEUTSCHE NORMEN July 1: UDC 621.315.615 : 62O-I : 621.317.335.3 : 621.317-374 I x Testing of Insulating Materials Determination of Dielectric Properties Measuring Cells for Liquids for Frequencies up to 100 MIIz UIIy I 53483 Sheet 3 Prfung von Isolierstoffen; Mezellen fr Flssigkeiten fr Frequenzen b
2、is 100 MIIz Bestimmung der dielektrischen Eigenschaften, For connection with IEC Publication 250-1966, see Explanations. This Standard has been com iled as a result of co-operation between the German Standards Association (DNA) and the gociety of German Electrical Engineers (VDE) represented on the
3、joint DNE Committee l,Dieleotric measurement“ and it agrees in subject matter with VDE Specification ME O303 Part 4, jointly with DIN 53483 Sheet I and Sheet 2. The following also belong to this Standard: DIN 53483 Sheet I DIN 53483 Sheet 2 Further Sheets are in course of preparation. Testing of ins
4、ulating materials, determination of dielectric properties; definition, general -; testing at standard frequencies of 50 HE, I KHI, 1 MFz Dimensions in mm Contents Page I. Requirements 1 2. Cleaning 2 3. Evaluation of the results - . . 2 I. Reouirements To guarantee satisfactorg measurements, measuri
5、ng cells for the determination of the relative permittivity and dielectric loss factor of liquid insulating materials and of fusible insulating compounds must satisfy the requirements set out below. The measuring cells must be easy to use and must be capable of being cleaned easily and quickly. The
6、measuring cells must be constructed in such a manner that they permit accurate temperature- holding, and the temperature of both electrodes must be capable of being measured. The measuring cells must be constructed of materials capable of withstanding the temperatures at which the measurements are m
7、ade without upsetting the location of the electrodes. The measuring cells and the electrode surfaces must consist of materials which neither undergo attack by the insulating material being tested, and by any impurities or ageing products to which it gives rise, nor experience any change due to the i
8、nsulating material being tested. Furthermore, the materials used must not have the proper I? o t e . gold, 21atinum or rhodium on the surfaces in contact with the liquid under test. Often, too, aluminium and duralumin have proved satisfactory. For insulating tho electrodes, quarts glasses or borosil
9、icate glasses are recommended. of absorbing the insulati material being tested. Suitable materials ara stainless ate%, also metals coated with elesroplated nickel, chromiumI The parts of the measuring cells which insulate the electrodes from each other shall not be capable of being wetted by the liq
10、uid under test. If necessary, suitable liquid outlets shall be provided. &e measuring cells and their electrical connections shall be designed in such a manner as to sllow effective electrical shielding. Phe measuring cell electrodes shall be separated from each other by adequately long creepage tif
11、ferences and shall not have any sharp edges within the volume involved in the test. leamring cells for use at frequencies above I MtIz shall preferably be designed to plug onto the :apacitance-measuring device direct, and shall have capacities f 50 pF in the filled condition. N o t e 1 : Measuring c
12、ells according to Fig. 2 are particularly suitable for high frequencies. N o t e it may be necessary to adopt a measuring cell of the smallest possible size. 2 i If only a small amount of the liquid to be tested is available for fillin8 the measUrin& Cell, Continued on pages 2 and 3 Explanations on
13、page 3 DIN 53483 B1.3 engl.Preirnr Ieinvorkouf der NormblBttw durch Beuth-Vertrieb GmbH, Berlin 30 und Kln Page 2 DIN 53483 Sheet 3 Eies,of-exectioo_oi-ea8r6-cell8 Figs. I to 3 show measuring cells which have proved satisfactory in practical use. Measuring cella as shown in figa. I and 3 are also su
14、itable for determining the volume resistance of the insulating liquid. For measurements on fusible insulating compounds, a measuring cell as shown in Fig. 3 can be used. Thia representa a variant of the circular disc electrode with guard ring. The specimen layer is made to slope downwards towards th
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