bsen62271-202-20xxhigh-voltageswitchgearandcontrolgearhighvoltagelowvoltageprefabricatedsubs

bsen62271-202-20xxhigh-voltageswitchgearandcontrolgearhighvoltagelowvoltageprefabricatedsubs内容摘要：

........... . 41 Maintenance ........................................................................................................ 41 Dismantling, recycling and disposal at the endofservice life ................................ 41 11 Safety ..........................................................................................................................41 Electrical aspects ............................................................................................... . 42 Mechanical aspects ............................................................................................. 42 Thermal aspects ................................................................................................. . 42 Internal arc aspects............................................................................................. 42 Annex A (normative) Method for testing the prefabricated substation under conditions of arcing due to an internal fault .......................................................................................... 44 Annex B (normative) Test to verify the sound level of a prefabricated substation ................. 57 Annex C (normative) Mechanical impact test ..................................................................... 59 Annex D (informative) Rating of transformers in an enclosure ............................................ 61 Annex E (informative) Examples of earthing circuits........................................................... . 64 Annex F (informative) Characteristics of enclosure materials .............................................. 67 Annex ZA (normative) Normative references to international publications with their corresponding European publications................................................................................. . 70 Annex ZB (informative) Adeviations.............................................................................. .....72 Bibliography .................................................................................................................. ..... 69 Figure 1 – Measurement of transformer temperature rise in ambient air: ∆t1 (refer to ) ..................................................................................................................... . 42 Figure 2 – Measurement of transformer temperature rise in an enclosure: ∆t2 (refer to ) ..................................................................................................................... . 43 Figure 3 – Diagram of the temperaturerise test (refer to ) ............................................ 43 Figure – Mounting frame for vertical indicators ............................................................. . 51 Figure – Horizontal indicators ...................................................................................... . 51 – 5 – EN 62271202:2020 Figure – Arrangement of indicators ............................................................................... 52 Figure – Selection of tests on HV switchgear for class IACA ......................................... 53 Figure – Selection of tests on HV switchgear for class IACB ......................................... 54 Figure – Selection of tests on HV interconnections for class IACA ................................ 55 Figure – Selection of tests on HV interconnections for class IACB ................................ 56 Figure – Impact test apparatus..................................................................................... . 60 Figure – Liquidfilled transformer load factor in an enclosure ......................................... 61 Figure – Drytype transformer load factor in an enclosure .............................................. 62 Figure – Example of earthing circuits ............................................................................ 64 Figure – Example of earthing circuits ............................................................................ 65 Figure – Example within the framework serving as the main earthing conductor ............. 66 Table 1 – Synthetic material characteristics ......................................................................... 19 Table 2 – Locations, causes and examples of measures decreasing the probability of internal arcs ............................................................................................................ ........... 32 Table 3 – Examples of measures limiting the consequences of internal arcs......................... 33 Table 4 – Summary of technical requirements and ratings for prefabricated substations ....................................................................................................................... 34 EN 62271202:2020 – 6 – INTRODUCTION Prefabricated substations are defined as a typetested assembly prising an enclosure containing transformers, lowvoltage and highvoltage switchgear, connections and auxiliary equipment to supply lowvoltage energy from a highvoltage system or vice versa. These substations are in locations accessible to the public and should ensure protection to persons according to the specified service conditions. This means that, in addition to the specified characteristics, ratings and relevant test procedures, particular attention has been paid to the specification concerning the protection of persons, both operators and general public. Use of typetested ponents and suitable design and construction of the enclosure ensure this protection. The correct design and performance of the prefabricated substation are verified by means of relevant type tests described in this standard, including internal arc tests. – 7 – EN 62271202:2020 HIGHVOLTAGE SWITCHGEAR AND CONTROLGEAR。