1、.* .i 1 1 . 1% fr: - ._ ,i,$.?, d sac: *- -. . - . A.C. metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 72.5 kV . rET*q:y,w .E - According to the CENELEC Internal Regulations the CENELEC member National Committees are bound: to announce the existence o
2、f this Harmonization Document at national level by Or beforo 1989-9-15 - _. - to publish their new harmonized irationa1 standard by or before 1990-03-15 CO withdraw a11 conflicting national standards by or before 1990-03-15. : _. .= The CENELEC National Committees are the national electrotechnical c
3、ommittees of Austria, Belgium, Denmark, FinlaVd, France, Germany, Gree.:e, fceliind, Ireiand, - italy. uxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzarland and United Kingdom. - -4 A- .? - - i. - . .-fi a Copyright reserved to all CENELEC members - HD 187 - Page 2 FOREWORD This Harino
4、nization Cocument was prepared by CENELEC TC 17C and sup2rsedes HD 187 S3. -: - - The testfinger is stan- dardized in HD 365 S3 -:. (IEC Pblicaticn 5291,. i -1 ro TECHNICAL ANNEX PARTIAL DISCEARGE TESTS .-. -L ,.: 1. General . The measurement of partial discharges is a suitable means2of detecting ce
5、rtain defects in the equipment under test and is a useful complement to the dielectric tests. Experience shows that partial discharges may lead in particular arrangements to a progressive degradation in tge dielectric strength of the insulation, especially of solid insulation. On the other hand, it
6、is not yet possible to establish a reliable relationship between the results of partial discharge measurements an the life expectancy of the equipment owing to the complexity of the insulation systems y:- used in - . .- -_ metal-enclosed switchgear and controlgear. .- /. - - . 1. -. _. - - - _- 2. A
7、pplication The measurement of partial discharges is recommended forcgetal-enclosed switchgear and controlgear if organic insulation materiax are largely Used therein. .- Because of the design variations a general specification-zor the test object cannot be given. In general, the test object should c
8、onsi$t of assemblies or sub-assemblies with dielectric stresses which are identicl .- to those which -. ._- would occur in the complete assembly of the equipment. - . a. Notes 1. - 2. - i. - lest objects consisting of a complete assembly are to be -I preferred. In the case of integrated switchgear d
9、esign, -.$- especially uhere various live parts and connections are ecgedded in solid insulation, tests on a complete asseiblv are nec-SsarY. .-ype test to show, in correlation with the other dielectric tests, if and where there are weak points with respect to the dielectric stresses resulting fgtm
10、the design of If the test is made, it shall be carried out before and afgr the lightning impulse and power-frequency voltage tests. .e % z -* x:. the equipment. - $ -. - -.-. - .i ,- Routine test _ The measurement of partial discharges is recommended as a ?outine tekt to detect possible material and
11、 manufacturing defects. It may-be made with the switching devices in the closed position. In the case of-$isconnectors where deterioration of the insulation between the open contactf.) by partial discharges is conceivable, additional partial discharge meacuremeqts should be made with the disconnecto
12、r in the open position. .-. - 7. Maximum permissible partial discharge quantity The maximum permissible partial discharge quantity at 1.16andlor 1 I 1 V/ shall be agreed between the manufacturer and the user. -*=.- Yote. - limit values of the Partial discharge auantitv will not be, .- $DeCilied unti
13、l further substantiated inforaation is available, For the tiae being, these values are left to the resPonsibilitv$of the manufacturer or, in the case of acceptance tests, are subjeit to agreement between the manufacturer and th; user, -. The partial discharge quantity is expressed in coulombs (C), A
14、. 2- 1 . I 1 . 8 a HD 18r a4 Page 10 N= E= z= m D= t= neutral connection earth connection terminals for the connection of the three-phase voltage source impedances of the test circuit c. coupling capacitor measuring impedance partial discharge detector test object %-:. in general, it is due to the e
15、lectricity supply system and the-wiring rules - _. Clause Country Special. national condition Justification ! I 41.5 kV and 82.5 kV 4.1.1 There are in use also See Rated voltages , system voltages of , NBN C 64-701 of 72.5 kV and i 1 below I . = 3404583 0030784 b ISSUE 15 SEPTEMBER 1989 ENGLISH VERS
16、ION INFORHATIVE ANNEX TO ED 187 S4 A.C. HETAL-ENCLOSED SWITCHGEAR AND CONTROLGEAR FOR RATED VOLTAGES ABOVE 1 kV AND UP TO AND INCLUDING 72.5 kV 3 Appareillage sous enveloppe Hetallgekapselte Wechselstrom- mtalliques pour courant alternatif de tensions assignes suprieures 1 kV et infrieures ou gales
17、72,5 kV 72,5 kV Schaltanlagen fr Nennspannungen ber 1 kV bis einschlieglich This informative annex presents national deviations from the content of the Harmonization Document HD 187 S4 which could not be removed before the time of approval of the HD. The requirements of these deviations are applicab
18、le only in the countries concerned. Copyright reserved to all CENELEC members National deviations to ED 187 S4 - - 1. The following national deviations are designated A- or B-deviations, which -. - G.- i -. B-deviation: A national deviation due to particular technical requirements permitted to be ma
19、intained for a specified transitional period. - Clause 6.106 Devia tion Arcing due to internal . fault SWEDEN Internal arc tests are mandatorily included in the type tests specified in SEN 36 21 15 (accepted by BT at 27th meeting). Justification Hitherto common practice in Sweden, it should be avoided that a conflicting specification will be issued by another authority. NS will be adjusted as soon as - a more acceptable RD is - available.
