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Historiskt om hjälpkraftsystemets införande? (Elektrifiering/elektrisk drift)

av mormorsgruvan, Thursday, April 04, 2013, 12:27 (4262 dagar sedan) @ mormorsgruvan

Från början utfördes hjälpkraftledningen av två koppartrådar med 10 kvadratmillimeters area och spänningen 2x5000V (10.000 volt mittjordat)
Vid stationer och banvaktstugor nedtransformeras den till 2x110V (220V mittjodat).
Nu utföres hjälpkraftledningen av 3 aluminiumlinor (area troligvis 150 kvadratmillimeter). Anledningen till förstärkningen är införande av växelvärme.

Hela tråden:

 

Time: 266
SELECT COUNT(*) FROM mlf2_entries LEFT JOIN mlf2_akismet_rating ON mlf2_akismet_rating.eid = mlf2_entries.id LEFT JOIN mlf2_b8_rating ON mlf2_b8_rating.eid = mlf2_entries.id WHERE pid = 0 AND (mlf2_akismet_rating.spam = 0 AND mlf2_b8_rating.spam = 0) AND category IN (0, 4, 5, 6, 7, 8, 9, 25, 14, 23, 19, 22, 24, 10, 21, 11, 12, 13, 15, 16, 26, 18, 20, 27)

Time: 1172
SELECT COUNT(*) FROM mlf2_entries LEFT JOIN mlf2_akismet_rating ON mlf2_akismet_rating.eid = mlf2_entries.id LEFT JOIN mlf2_b8_rating ON mlf2_b8_rating.eid = mlf2_entries.id WHERE (mlf2_akismet_rating.spam = 1 OR mlf2_b8_rating.spam = 1)
Time: 1252
SELECT COUNT(*) FROM mlf2_entries LEFT JOIN mlf2_akismet_rating ON mlf2_akismet_rating.eid = mlf2_entries.id LEFT JOIN mlf2_b8_rating ON mlf2_b8_rating.eid = mlf2_entries.id WHERE category IN (0, 4, 5, 6, 7, 8, 9, 25, 14, 23, 19, 22, 24, 10, 21, 11, 12, 13, 15, 16, 26, 18, 20, 27) AND (mlf2_akismet_rating.spam = 0 AND mlf2_b8_rating.spam = 0)

Total time: 2731