{"id":10651,"date":"2026-08-29T23:43:23","date_gmt":"2026-08-29T15:43:23","guid":{"rendered":"https:\/\/q8bbzjnpm5.wpdns.site\/?p=10651"},"modified":"2026-08-29T23:43:23","modified_gmt":"2026-08-29T15:43:23","slug":"how-to-choose-transformers-for-moist-tunnels-focus-on-these-3-points","status":"publish","type":"post","link":"https:\/\/subian-electric.com\/ar\/news\/how-to-choose-transformers-for-moist-tunnels-focus-on-these-3-points\/","title":{"rendered":"\u0643\u064a\u0641\u064a\u0629 \u0627\u062e\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u062d\u0648\u0644\u0627\u062a \u0644\u0644\u0623\u0646\u0641\u0627\u0642 \u0627\u0644\u0631\u0637\u0628\u0629\u061f \u0627\u0644\u062a\u0631\u0643\u064a\u0632 \u0639\u0644\u0649 \u0647\u0630\u0647 \u0627\u0644\u0646\u0642\u0627\u0637 \u0627\u0644\u062b\u0644\u0627\u062b"},"content":{"rendered":"<p>\u0625\u0630\u0627 \u0632\u0631\u062a \u063a\u0631\u0641\u0629 \u0627\u0644\u0645\u0641\u0627\u062a\u064a\u062d \u0628\u064a\u0646 \u0637\u0631\u0641\u064a \u0646\u0641\u0642 \u0637\u0631\u064a\u0642 \u062d\u0636\u0631\u064a \u0641\u064a \u0645\u0646\u062a\u0635\u0641 \u0645\u0648\u0633\u0645 \u0627\u0644\u0635\u064a\u0641 \u0648\u0631\u0623\u064a\u062a \u062d\u0627\u0644\u062a\u0647\u0627\u060c \u0633\u062a\u062d\u0635\u0644 \u0639\u0644\u0649 \u0627\u0644\u0625\u062c\u0627\u0628\u0629. \u0627\u0644\u0645\u062d\u0648\u0644 \u0628\u0642\u062f\u0631\u0629 800kVA\u060c \u0627\u0644\u0630\u064a \u0647\u0648 \u0627\u0644\u0645\u0635\u062f\u0631 \u0627\u0644\u0631\u0626\u064a\u0633\u064a \u0644\u0644\u0637\u0627\u0642\u0629 \u0644\u0646\u0638\u0627\u0645 \u0627\u0644\u062a\u0647\u0648\u064a\u0629 \u0648\u0627\u0644\u0625\u0636\u0627\u0621\u0629 \u0641\u064a \u0627\u0644\u0646\u0641\u0642\u060c \u064a\u0642\u0639 \u062f\u0627\u062e\u0644 \u063a\u0631\u0641\u0629 \u0628\u0645\u0633\u062a\u0648\u0649 \u0631\u0637\u0648\u0628\u0629 \u064a\u062a\u062c\u0627\u0648\u0632 85% \u0644\u0639\u062f\u0629 \u0623\u0634\u0647\u0631. \u0643\u0644 \u0644\u064a\u0644\u0629\u060c \u062a\u062a\u0634\u0643\u0644 \u0627\u0644\u062a\u0643\u062b\u0641\u0627\u062a \u0639\u0644\u0649 \u0633\u0637\u062d \u0627\u0644\u062e\u0632\u0627\u0646. \u062a\u0638\u0647\u0631 \u062c\u062f\u0631\u0627\u0646 \u0627\u0644\u063a\u0631\u0641\u0629 \u0628\u0642\u0639\u064b\u0627 \u0646\u0627\u062a\u062c\u0629 \u0639\u0646 \u062a\u0631\u0633\u0628\u0627\u062a \u0627\u0644\u0645\u0644\u062d \u0628\u0633\u0628\u0628 \u0645\u0648\u0627\u062f \u0625\u0632\u0627\u0644\u0629 \u0627\u0644\u062c\u0644\u064a\u062f \u0627\u0644\u062a\u064a \u062a\u0645 \u062a\u0641\u0631\u064a\u063a\u0647\u0627 \u0645\u0646 \u0627\u0644\u0637\u0631\u064a\u0642. \u062a\u0633\u062c\u0644 \u062a\u0627\u0631\u064a\u062e \u0627\u0644\u0635\u064a\u0627\u0646\u0629 \u062b\u0644\u0627\u062b \u062d\u0627\u0644\u0627\u062a \u0644\u0641\u0635\u0644 \u0627\u0644\u0645\u0631\u062d\u0644\u0627\u062a \u0647\u0630\u0627 \u0627\u0644\u0639\u0627\u0645 \u0628\u0633\u0628\u0628 \u0627\u0644\u0645\u0634\u0627\u0643\u0644 \u0627\u0644\u062a\u064a \u062a\u0633\u0628\u0628 \u062a\u0643\u0648\u064a\u0646 \u062f\u0648\u0627\u0626\u0631 \u0642\u0635\u064a\u0631\u0629 \u0639\u0644\u0649 \u0627\u0644\u0642\u0636\u0628\u0627\u0646 \u0627\u0644\u0643\u0647\u0631\u0628\u0627\u0626\u064a\u0629 \u0630\u0627\u062a \u0627\u0644\u062c\u0647\u062f \u0627\u0644\u0645\u0646\u062e\u0641\u0636 \u0628\u0633\u0628\u0628 \u0627\u0644\u0631\u0637\u0648\u0628\u0629. \u062a\u0638\u0647\u0631 \u0627\u062e\u062a\u0628\u0627\u0631 \u0627\u0644\u0632\u064a\u062a \u0623\u0646\u0647 \u064a\u062d\u062a\u0648\u064a \u0639\u0644\u0649 42 \u062c\u0632\u0621 \u0641\u064a \u0627\u0644\u0645\u0644\u064a\u0648\u0646 \u0645\u0646 \u0627\u0644\u0645\u0627\u0621\u060c \u0648\u0647\u0648 \u0645\u0627 \u064a\u062a\u062c\u0627\u0648\u0632 \u0627\u0644\u0645\u0639\u062f\u0644 \u0627\u0644\u0645\u0633\u0645\u0648\u062d \u0628\u0647 \u0627\u0644\u0628\u0627\u0644\u063a 30 \u062c\u0632\u0621 \u0641\u064a \u0627\u0644\u0645\u0644\u064a\u0648\u0646 \u0648\u064a\u0633\u0628\u0628 \u062a\u062f\u0647\u0648\u0631 \u0627\u0644\u0639\u0632\u0644 \u0627\u0644\u0645\u0635\u0646\u0648\u0639 \u0645\u0646 \u0627\u0644\u0648\u0631\u0642.<\/p>\n<p>\u0627\u0644\u0623\u0646\u0641\u0627\u0642 \u0647\u064a \u0645\u0646 \u0623\u0635\u0639\u0628 \u0627\u0644\u0623\u0645\u0627\u0643\u0646 \u0644\u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0627\u0644\u0645\u062d\u0648\u0644\u0627\u062a \u0628\u0633\u0628\u0628 \u0627\u0644\u0631\u0637\u0648\u0628\u0629 \u0627\u0644\u0645\u0648\u062c\u0648\u062f\u0629 \u0641\u064a\u0647\u0627. \u062a\u0642\u062f\u0645 \u0644\u0643 \u0647\u0630\u0647 \u0627\u0644\u0645\u0642\u0627\u0644\u0629 3 \u0642\u0636\u0627\u064a\u0627 \u0645\u0647\u0645\u0629 \u064a\u062c\u0628 \u0623\u0646 \u062a\u0636\u0639\u0647\u0627 \u0641\u064a \u0627\u0639\u062a\u0628\u0627\u0631\u0643 \u0623\u062b\u0646\u0627\u0621 \u0627\u062e\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u062d\u0648\u0644\u0627\u062a \u0644\u0644\u0623\u0646\u0641\u0627\u0642: \u062d\u0645\u0627\u064a\u0629 \u0627\u0644\u0639\u0632\u0644 \u0648\u0627\u0644\u0625\u063a\u0644\u0627\u0642\u060c \u0627\u062e\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u0648\u0627\u062f \u0648\u062d\u0645\u0627\u064a\u0629 \u0627\u0644\u062a\u0622\u0643\u0644\u060c \u0648\u0627\u0644\u062a\u0647\u0648\u064a\u0629 \u0648\u0627\u0644\u062a\u062d\u0643\u0645 \u0641\u064a \u0627\u0644\u062a\u0643\u062b\u0641.<\/p>\n<blockquote><p>\u0627\u0644\u0625\u062c\u0627\u0628\u0629 \u0627\u0644\u0645\u062e\u062a\u0635\u0631\u0629 \u0645\u0630\u0643\u0648\u0631\u0629 \u0647\u0646\u0627: \u0623\u062b\u0646\u0627\u0621 \u0627\u062e\u062a\u064a\u0627\u0631 \u0645\u062d\u0648\u0644 \u0644\u0644\u0623\u0646\u0641\u0627\u0642 \u0627\u0644\u0631\u0637\u0628\u0629\u060c \u064a\u062c\u0628 \u0623\u062e\u0630 \u062b\u0644\u0627\u062b\u0629 \u0623\u0634\u064a\u0627\u0621 \u0641\u064a \u0627\u0644\u0627\u0639\u062a\u0628\u0627\u0631: (1) \u0627\u0644\u062d\u0645\u0627\u064a\u0629 \u0628\u0648\u0627\u0633\u0637\u0629 \u0627\u0644\u0625\u063a\u0644\u0627\u0642 \u0648\u0627\u0644\u0639\u0632\u0644 - \u0628\u0627\u0644\u0646\u0633\u0628\u0629 \u0644\u0623\u0646\u0648\u0627\u0639 \u0627\u0644\u0645\u062d\u0648\u0644\u0627\u062a \u0627\u0644\u062c\u0627\u0641\u0629\u060c \u064a\u062c\u0628 \u062a\u062d\u062f\u064a\u062f \u0623\u063a\u0644\u0641\u0629 \u0645\u0635\u0646\u0641\u0629 IP54 \u0648IP55. \u0641\u064a \u062d\u0627\u0644\u0629 \u0627\u0644\u0645\u062d\u0648\u0644\u0627\u062a \u0627\u0644\u0645\u063a\u0645\u0648\u0631\u0629 \u0628\u0627\u0644\u0632\u064a\u062a\u060c \u064a\u062c\u0628 \u062a\u062d\u062f\u064a\u062f \u062e\u0632\u0627\u0646\u0627\u062a \u0645\u062d\u0643\u0645\u0629 \u0627\u0644\u0635\u0646\u0639 \u0645\u0635\u0646\u0648\u0639\u0629 \u0645\u0646 \u0645\u0648\u0627\u062f \u0645\u0642\u0627\u0648\u0645\u0629 \u0644\u0644\u062a\u0622\u0643\u0644\u061b (2) \u0627\u0644\u0645\u0648\u0627\u062f \u0627\u0644\u0645\u0642\u0627\u0648\u0645\u0629 \u0644\u0644\u062a\u0622\u0643\u0644 - \u0623\u063a\u0644\u0641\u0629 \u0645\u0635\u0646\u0648\u0639\u0629 \u0645\u0646 \u0627\u0644\u0641\u0648\u0644\u0627\u0630 \u0627\u0644\u0645\u0642\u0627\u0648\u0645 \u0644\u0644\u0635\u062f\u0623 \u0623\u0648 \u0645\u0648\u0627\u062f \u0645\u0637\u0644\u064a\u0629 \u0628\u0627\u0644\u0645\u0633\u062d\u0648\u0642 \u0627\u0644\u062b\u0642\u064a\u0644\u0629\u060c \u062a\u0634\u0637\u064a\u0628\u0627\u062a \u0645\u0635\u0646\u0641\u0629 \u0644\u0641\u0626\u0629 \u0627\u0644\u062a\u0622\u0643\u0644 C3\/C4 \u0648\u0641\u0642\u064b\u0627 \u0644\u0645\u0639\u064a\u0627\u0631 ISO 12944\u060c \u0639\u0648\u0627\u0632\u0644 \u0627\u0633\u062a\u0648\u0627\u0626\u064a\u0629 \u0628\u0645\u0633\u062a\u0648\u064a\u0627\u062a \u0631\u0637\u0648\u0628\u0629 \u0639\u0627\u0644\u064a\u0629\u061b (3) \u0627\u0644\u062a\u0647\u0648\u064a\u0629 \u0648\u0645\u0646\u0639 \u0627\u0644\u062a\u0643\u062b\u0641 - \u062a\u0628\u0627\u062f\u0644 \u0627\u0644\u0647\u0648\u0627\u0621 \u0627\u0644\u0645\u0646\u0638\u0645\u060c \u0633\u062e\u0627\u0646\u0627\u062a \u0645\u0636\u0627\u062f\u0629 \u0644\u0644\u062a\u0643\u062b\u0641\u061b \u0648\u062d\u062f\u0627\u062a \u0627\u0644\u062a\u062d\u0643\u0645 \u0641\u064a \u0627\u0644\u0631\u0637\u0648\u0628\u0629.<\/p><\/blockquote>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10653\" src=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/How-To-Choose-Transformers-For-Moist-Tunnels-Focus-On-These-3-Points.webp\" alt=\"How To Choose Transformers For Moist Tunnels Focus On These 3 Points\" width=\"1448\" height=\"1086\" \/><\/p>\n<hr \/>\n<h2 id=\"why\">\u0644\u0645\u0627\u0630\u0627 \u062a\u062f\u0645\u0631 \u0627\u0644\u0623\u0646\u0641\u0627\u0642 \u0627\u0644\u0631\u0637\u0628\u0629 \u0627\u0644\u0645\u062d\u0648\u0644\u0627\u062a<\/h2>\n<p>\u0641\u0634\u0644 \u0627\u0644\u0645\u062d\u0648\u0644 \u0641\u064a \u0627\u0644\u0628\u064a\u0626\u0627\u062a \u0627\u0644\u0631\u0637\u0628\u0629 \u0644\u064a\u0633 \u0639\u0627\u062f\u0629 \u062d\u0627\u062f\u062b\u064b\u0627 \u0643\u0647\u0631\u0628\u0627\u0626\u064a\u064b\u0627 \u0641\u0648\u0631\u064a\u064b\u0627 - \u0628\u0644 \u0647\u0648 \u0639\u0645\u0644\u064a\u0629 \u0643\u064a\u0645\u064a\u0627\u0626\u064a\u0629 \u0648\u0641\u064a\u0632\u064a\u0627\u0626\u064a\u0629 \u062a\u062f\u0631\u064a\u062c\u064a\u0629. \u0625\u0644\u064a\u0643 \u0627\u0644\u0623\u0633\u0628\u0627\u0628 \u0627\u0644\u0631\u0626\u064a\u0633\u064a\u0629:<\/p>\n<ul>\n<li>\u0627\u0644\u0631\u0637\u0648\u0628\u0629 \u0641\u064a \u0627\u0644\u0639\u0632\u0644: \u0641\u064a \u0627\u0644\u0645\u062d\u0648\u0644\u0627\u062a \u0627\u0644\u0645\u063a\u0645\u0648\u0631\u0629 \u0628\u0627\u0644\u0632\u064a\u062a\u060c \u062a\u062f\u062e\u0644 \u0627\u0644\u0631\u0637\u0648\u0628\u0629 \u0645\u0646 \u062e\u0644\u0627\u0644 \u0623\u062c\u0647\u0632\u0629 \u0627\u0644\u062a\u0646\u0641\u0633\u060c \u0648\u0627\u0644\u062d\u0634\u0648\u0627\u062a \u0648\u0627\u0644\u062a\u0643\u062b\u0641. \u0645\u0633\u062a\u0648\u064a\u0627\u062a \u0627\u0644\u0631\u0637\u0648\u0628\u0629 \u0627\u0644\u062a\u064a \u062a\u062a\u062c\u0627\u0648\u0632 30 \u062c\u0632\u0621 \u0641\u064a \u0627\u0644\u0645\u0644\u064a\u0648\u0646 \u0641\u064a \u0632\u064a\u062a \u0627\u0644\u0645\u062d\u0648\u0644 \u062a\u0633\u0631\u0639 \u0645\u0646 \u0634\u064a\u062e\u0648\u062e\u0629 \u0627\u0644\u0639\u0632\u0644 \u0627\u0644\u0648\u0631\u0642\u064a\u060c \u0645\u0645\u0627 \u064a\u0642\u0644\u0644 \u0645\u0646 \u0627\u0644\u0639\u0645\u0631 \u0625\u0644\u0649 \u0627\u0644\u0646\u0635\u0641 \u0645\u0639 \u0643\u0644 \u0631\u0637\u0648\u0628\u0629 \u0645\u0631\u062a\u064a\u0646 \u0623\u0639\u0644\u0649 \u0645\u0646 \u0627\u0644\u0637\u0628\u064a\u0639\u064a. \u0639\u0646\u062f 50-60 \u062c\u0632\u0621 \u0641\u064a \u0627\u0644\u0645\u0644\u064a\u0648\u0646\u060c \u0642\u062f \u062a\u062d\u062f\u062b \u0641\u0642\u0627\u0639\u0627\u062a \u0623\u062b\u0646\u0627\u0621 \u0627\u0644\u062d\u0645\u0644 \u0627\u0644\u0632\u0627\u0626\u062f \u0648\u062a\u0624\u062f\u064a \u0625\u0644\u0649 \u0641\u0634\u0644 \u0639\u0627\u0632\u0644.<\/li>\n<li>\u062a\u062a\u0628\u0639 \u0627\u0644\u0633\u0637\u062d \u0648\u0627\u0644\u0632\u062d\u0641: \u0639\u0644\u0649 \u0644\u0641\u0627\u062a \u0648\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0646\u0648\u0639 \u0627\u0644\u062c\u0627\u0641\u060c \u062a\u062e\u0644\u0642 \u0627\u0644\u0631\u0637\u0648\u0628\u0629 \u0645\u0639 \u0627\u0644\u063a\u0628\u0627\u0631 \u0623\u0648 \u0627\u0644\u0645\u0644\u062d \u0642\u0646\u0648\u0627\u062a \u0645\u0648\u0635\u0644\u0629 \u0639\u0644\u0649 \u0627\u0644\u0633\u0637\u062d \u062a\u0624\u062f\u064a \u0625\u0644\u0649 \u062a\u0641\u0631\u064a\u063a \u062c\u0632\u0626\u064a \u0648\u0648\u0645\u064a\u0636.<\/li>\n<li>\u062a\u0622\u0643\u0644 \u0627\u0644\u062e\u0632\u0627\u0646\u060c \u0648\u0627\u0644\u062a\u062c\u0647\u064a\u0632\u0627\u062a \u0648\u0627\u0644\u0627\u062a\u0635\u0627\u0644\u0627\u062a: \u064a\u0647\u0627\u062c\u0645 \u0627\u0644\u0645\u0643\u062b\u0641 \u0627\u0644\u0645\u062d\u062a\u0648\u064a \u0639\u0644\u0649 \u0627\u0644\u0645\u0644\u062d \u0627\u0644\u062e\u0632\u0627\u0646\u0627\u062a\u060c \u0648\u0634\u0641\u0631\u0627\u062a \u0627\u0644\u0645\u0628\u0631\u062f\u060c \u0648\u062a\u062c\u0647\u064a\u0632\u0627\u062a \u0627\u0644\u0643\u0627\u0628\u0644\u0627\u062a \u0648\u0627\u0644\u0627\u062a\u0635\u0627\u0644\u0627\u062a \u0627\u0644\u0645\u062b\u0628\u062a\u0629\u060c \u0645\u0645\u0627 \u064a\u0632\u064a\u062f \u0645\u0646 \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u0627\u062a\u0635\u0627\u0644 \u0648\u0623\u062e\u064a\u0631\u064b\u0627 \u064a\u062a\u0633\u0628\u0628 \u0641\u064a \u0646\u0642\u0627\u0637 \u0633\u0627\u062e\u0646\u0629.<\/li>\n<li>\u062a\u0643\u062b\u0641 \u063a\u0631\u0641 \u0627\u0644\u062a\u062d\u0643\u0645 \u0648\u0627\u0644\u062c\u0647\u062f \u0627\u0644\u0645\u0646\u062e\u0641\u0636: \u062a\u0624\u062f\u064a \u062a\u0642\u0644\u0628\u0627\u062a \u062f\u0631\u062c\u0627\u062a \u0627\u0644\u062d\u0631\u0627\u0631\u0629 \u0625\u0644\u0649 \u062a\u0643\u062b\u0641 \u0627\u0644\u0645\u0627\u0621 \u0639\u0644\u0649 \u0627\u0644\u0642\u0636\u0628\u0627\u0646 \u0627\u0644\u0643\u0647\u0631\u0628\u0627\u0626\u064a\u0629 \u0648\u0627\u0644\u0648\u062d\u062f\u0627\u062a \u0627\u0644\u0625\u0644\u0643\u062a\u0631\u0648\u0646\u064a\u0629\u060c \u0648\u064a\u0645\u0643\u0646 \u0623\u0646 \u062a\u0624\u062f\u064a \u062d\u0627\u062f\u062b\u0629 \u062a\u0643\u062b\u0641 \u0648\u0627\u062d\u062f\u0629 \u0625\u0644\u0649 \u062d\u062f\u0648\u062b \u062a\u0641\u0631\u064a\u063a \u0628\u064a\u0646 \u0627\u0644\u0637\u0648\u0631\u064a\u0646.<\/li>\n<\/ul>\n<p>\u0648\u062a\u0624\u0643\u062f \u0627\u0644\u0625\u062d\u0635\u0627\u0626\u064a\u0627\u062a \u0627\u0644\u0641\u064a\u0632\u064a\u0627\u0621: \u062a\u0638\u0647\u0631 \u0627\u0644\u0645\u062d\u0648\u0644\u0627\u062a \u0641\u064a \u0627\u0644\u0645\u0648\u0627\u0642\u0639 \u0627\u0644\u0633\u0627\u062d\u0644\u064a\u0629 \u0648\u0623\u0646\u0641\u0627\u0642 \u0627\u0644\u0637\u0631\u0642 \u0645\u0639\u062f\u0644 \u0641\u0634\u0644 \u0623\u0643\u0628\u0631 \u0628\u0645\u0642\u062f\u0627\u0631 2-3 \u0645\u0631\u0627\u062a \u0645\u0642\u0627\u0631\u0646\u0629\u064b \u0628\u0627\u0644\u0648\u062d\u062f\u0627\u062a \u0641\u064a \u0627\u0644\u0645\u0646\u0627\u0637\u0642 \u0627\u0644\u062f\u0627\u062e\u0644\u064a\u0629 \u0627\u0644\u062c\u0627\u0641\u0629\u060c \u062d\u064a\u062b \u064a\u0639\u062a\u0628\u0631 \u062a\u062f\u0647\u0648\u0631 \u0627\u0644\u0639\u0632\u0644 \u0627\u0644\u0646\u0627\u062a\u062c \u0639\u0646 \u0627\u0644\u0631\u0637\u0648\u0628\u0629 \u0627\u0644\u0633\u0628\u0628 \u0627\u0644\u0631\u0626\u064a\u0633\u064a \u0644\u0644\u0641\u0634\u0644 \u0627\u0644\u0630\u064a \u062a\u0645 \u0627\u0644\u0639\u062b\u0648\u0631 \u0639\u0644\u064a\u0647 \u0641\u064a \u0627\u0644\u062a\u062d\u0642\u064a\u0642\u0627\u062a \u0627\u0644\u062c\u0646\u0627\u0626\u064a\u0629. \u0627\u0644\u062d\u0644 \u0644\u064a\u0633 \u0627\u0644\u0635\u064a\u0627\u0646\u0629 - \u0628\u0644 \u0647\u0648 \u0627\u0644\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0635\u062d\u064a\u062d\u0629 \u0623\u062b\u0646\u0627\u0621 \u0627\u0644\u0634\u0631\u0627\u0621.<\/p>\n<h2 id=\"point1\">\u0627\u0644\u0646\u0642\u0637\u0629 1: \u062d\u0645\u0627\u064a\u0629 \u0627\u0644\u0639\u0644\u0628\u0629 \u0648\u0627\u0644\u0639\u0632\u0644<\/h2>\n<p>\u0627\u0644\u0633\u0624\u0627\u0644 \u0627\u0644\u0631\u0626\u064a\u0633\u064a \u0647\u0648 \u0643\u064a\u0641\u064a\u0629 \u0645\u0646\u0639 \u0627\u0644\u0631\u0637\u0648\u0628\u0629 \u0645\u0646 \u0627\u0644\u062a\u0623\u062b\u064a\u0631 \u0639\u0644\u0649 \u0627\u0644\u0639\u0632\u0644. \u0645\u0646 \u062d\u064a\u062b \u0644\u063a\u0629 \u0627\u0644\u0645\u0648\u0627\u0635\u0641\u0627\u062a\u060c \u0645\u0646 \u0627\u0644\u0645\u0647\u0645 \u0623\u0646 \u0646\u0643\u0648\u0646 \u062f\u0642\u064a\u0642\u064a\u0646:<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0627\u0644\u0639\u0646\u0635\u0631<\/th>\n<th>\u0627\u0644\u0645\u0639\u064a\u0627\u0631 \/ \u0627\u0644\u0645\u062a\u0637\u0644\u0628\u0627\u062a<\/th>\n<th>\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u062f\u0631\u062c\u0629 \u0627\u0644\u0646\u0641\u0642<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0639\u0644\u0628\u0629 \u0645\u0646 \u0627\u0644\u0646\u0648\u0639 \u0627\u0644\u062c\u0627\u0641<\/td>\n<td>\u062a\u0635\u0646\u064a\u0641 IP \u0648\u0641\u0642\u064b\u0627 \u0644\u0640 IEC 60529<\/td>\n<td>IP54 \u0643\u062d\u062f \u0623\u062f\u0646\u0649\u061b IP55 \u062d\u064a\u062b \u064a\u0645\u0643\u0646 \u0623\u0646 \u064a\u062d\u062f\u062b \u0631\u0634 \u0627\u0644\u0645\u0627\u0621<\/td>\n<\/tr>\n<tr>\n<td>\u062e\u0632\u0627\u0646 \u0645\u063a\u0645\u0648\u0631 \u0628\u0627\u0644\u0632\u064a\u062a<\/td>\n<td>IEC 60529 + \u062a\u0635\u0645\u064a\u0645 \u0645\u062d\u0643\u0645<\/td>\n<td>\u062e\u0632\u0627\u0646 \u0645\u062d\u0643\u0645 \u0645\u0639 \u0646\u0638\u0627\u0645 \u062d\u0641\u0638 \u0627\u0644\u0632\u064a\u062a (\u063a\u0637\u0627\u0621 \u0646\u064a\u062a\u0631\u0648\u062c\u064a\u0646 \u0623\u0648 \u0646\u0648\u0639 \u0627\u0645\u062a\u0635\u0627\u0635 \u0627\u0644\u063a\u0627\u0632)<\/td>\n<\/tr>\n<tr>\n<td>\u0627\u0644\u0628\u0648\u0634\u0627\u062a \u0648\u0627\u0644\u062a\u0648\u0635\u064a\u0644\u0627\u062a<\/td>\n<td>IEC 60529 \/ \u0627\u0644\u0632\u062d\u0641 \u0648\u0641\u0642\u064b\u0627 \u0644\u0640 IEC 60076<\/td>\n<td>\u0645\u0633\u0627\u0641\u0627\u062a \u0632\u062d\u0641 \u0645\u0648\u0633\u0639\u0629\u060c \u0645\u0638\u0644\u0627\u062a \u0633\u064a\u0644\u064a\u0643\u0648\u0646 \u0623\u0648 \u0625\u064a\u0628\u0648\u0643\u0633\u064a\u060c \u0635\u0646\u0627\u062f\u064a\u0642 \u0643\u0627\u0628\u0644\u0627\u062a IP54<\/td>\n<\/tr>\n<tr>\n<td>\u063a\u0631\u0641 \u0627\u0644\u062a\u062d\u0643\u0645 \/ \u0627\u0644\u062c\u0647\u062f \u0627\u0644\u0645\u0646\u062e\u0641\u0636<\/td>\n<td>IEC 60529<\/td>\n<td>\u063a\u0631\u0641 IP55 \u0645\u0639 \u0623\u0628\u0648\u0627\u0628 \u0645\u062d\u0643\u0645\u0629 \u0627\u0644\u063a\u0644\u0642 \u0648\u0645\u0631\u0634\u062d\u0627\u062a \u062a\u0646\u0641\u0633<\/td>\n<\/tr>\n<tr>\n<td>\u0646\u0638\u0627\u0645 \u0627\u0644\u0639\u0632\u0644<\/td>\n<td>IEC 60076-11 (\u062c\u0627\u0641)\u060c IEC 60076-1 (\u0632\u064a\u062a)<\/td>\n<td>\u0639\u0632\u0644 \u0645\u062f\u0627\u0631\u064a\u060c \u062d\u062f\u0648\u062f \u0645\u062d\u062a\u0648\u0649 \u0627\u0644\u0631\u0637\u0648\u0628\u0629 \u0627\u0644\u0645\u0630\u0643\u0648\u0631\u0629 \u0641\u064a \u0648\u0631\u0642\u0629 \u0627\u0644\u0628\u064a\u0627\u0646\u0627\u062a<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u0627\u0644\u062e\u0637\u0623 \u0627\u0644\u0645\u0639\u062a\u0627\u062f \u0647\u0648 \u062a\u062d\u062f\u064a\u062f \u0639\u0644\u0628 IP23 \u0623\u0648 IP31 - \u0628\u064a\u0646\u0645\u0627 \u0642\u062f \u062a\u0643\u0648\u0646 \u0645\u0646\u0627\u0633\u0628\u0629 \u0644\u0644\u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0627\u0644\u0635\u0646\u0627\u0639\u064a \u0641\u064a \u0627\u0644\u062f\u0627\u062e\u0644\u060c \u0625\u0644\u0627 \u0623\u0646\u0647\u0627 \u0644\u0646 \u062a\u0639\u0645\u0644 \u0641\u064a \u0627\u0644\u062d\u0627\u0644\u0627\u062a \u0627\u0644\u0645\u0639\u0631\u0636\u0629 \u0644\u0638\u0631\u0648\u0641 \u0631\u0637\u0648\u0628\u0629 \u0645\u0633\u062a\u0645\u0631\u0629 \u0641\u064a \u0627\u0644\u0646\u0641\u0642. \u0643\u0644 \u0646\u0633\u0628\u0629 \u062a\u062d\u0633\u064a\u0646 \u0641\u064a IP \u062a\u0643\u0644\u0641 \u0639\u0627\u062f\u0629 \u062d\u0648\u0627\u0644\u064a 400-1,500 \u062f\u0648\u0644\u0627\u0631 \u0644\u0643\u0644 \u0648\u062d\u062f\u0629\u060c \u0648\u0645\u0639 \u0630\u0644\u0643 \u0641\u0625\u0646 \u0627\u0644\u062a\u0645\u064a\u064a\u0632 \u0628\u064a\u0646 IP31 \u0648IP55 \u0647\u0648 \u0627\u0644\u0630\u064a \u064a\u062d\u062f\u062f \u0645\u0627 \u0625\u0630\u0627 \u0643\u0627\u0646\u062a \u0627\u0644\u0645\u062d\u0648\u0644\u0627\u062a \u0641\u064a \u0627\u0644\u0646\u0641\u0642 \u0633\u062a\u062f\u0648\u0645 \u0644\u062e\u0645\u0633 \u0633\u0646\u0648\u0627\u062a.<\/p>\n<h2 id=\"point2\">\u0627\u0644\u0646\u0642\u0637\u0629 2: \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062a\u0622\u0643\u0644 \u0648\u0627\u0644\u0645\u0648\u0627\u062f<\/h2>\n<p>\u0627\u0644\u0646\u0642\u0637\u0629 \u0627\u0644\u0645\u0647\u0645\u0629 \u0627\u0644\u062b\u0627\u0646\u064a\u0629 \u0641\u064a \u0627\u062a\u062e\u0627\u0630 \u0627\u0644\u0642\u0631\u0627\u0631 \u0647\u064a \u0627\u062e\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u0648\u0627\u062f. \u0641\u064a \u0628\u064a\u0626\u0629 \u0627\u0644\u0646\u0641\u0642 \u0627\u0644\u0631\u0637\u0628\u0629\u060c \u062a\u0639\u062a\u0628\u0631 \u0627\u0644\u062a\u0634\u0637\u064a\u0628\u0627\u062a \u0627\u0644\u0633\u0637\u062d\u064a\u0629 \u0648\u062c\u0648\u062f\u0629 \u0627\u0644\u0645\u0639\u062f\u0646 \u0628\u0646\u0641\u0633 \u0627\u0644\u0642\u062f\u0631 \u0645\u0646 \u0627\u0644\u0623\u0647\u0645\u064a\u0629 \u0645\u062b\u0644 \u062a\u0635\u0645\u064a\u0645 \u0627\u0644\u0623\u0646\u0638\u0645\u0629 \u0627\u0644\u0643\u0647\u0631\u0628\u0627\u0626\u064a\u0629. \u0627\u0644\u0645\u0639\u064a\u0627\u0631 \u0627\u0644\u0645\u0639\u0645\u0648\u0644 \u0628\u0647 \u0647\u0648 ISO 12944 (\u0627\u0644\u062f\u0647\u0627\u0646\u0627\u062a \u0648\u0627\u0644\u0637\u0644\u0627\u0621\u0627\u062a \u0644\u0644\u0625\u0646\u0634\u0627\u0621\u0627\u062a \u0627\u0644\u0641\u0648\u0644\u0627\u0630\u064a\u0629) \u0627\u0644\u0630\u064a \u064a\u0642\u0633\u0645 \u0627\u0644\u062a\u0622\u0643\u0644 \u0627\u0644\u062c\u0648\u064a \u0625\u0644\u0649 \u0641\u0626\u0627\u062a \u0645\u0646 C1 (\u0627\u0644\u062f\u0627\u062e\u0644\u064a\u0629 \u0627\u0644\u0645\u0647\u0648\u0627\u0629) \u0625\u0644\u0649 C5-X (\u0642\u0648\u064a \u062c\u062f\u064b\u0627). \u062a\u064f\u0639\u062a\u0628\u0631 \u0627\u0644\u0623\u0646\u0641\u0627\u0642 \u0627\u0644\u062a\u064a \u062a\u062a\u0639\u0631\u0636 \u0644\u0631\u0634\u0627\u062a \u0645\u0646 \u0627\u0644\u0633\u064a\u0627\u0631\u0627\u062a \u0639\u0645\u0648\u0645\u064b\u0627 C3 \u0623\u0648 C4\u060c \u0628\u064a\u0646\u0645\u0627 \u064a\u0645\u0643\u0646 \u0623\u0646 \u062a\u0635\u0644 \u0627\u0644\u0623\u0646\u0641\u0627\u0642 \u0627\u0644\u063a\u0646\u064a\u0629 \u0628\u0627\u0644\u0645\u0644\u062d \u0625\u0644\u0649 \u0627\u0644\u0641\u0626\u0629 C5-I.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0627\u0644\u0645\u0643\u0648\u0646<\/th>\n<th>\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0645\u0639\u064a\u0627\u0631<\/th>\n<th>\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u062f\u0631\u062c\u0629 \u0627\u0644\u0646\u0641\u0642<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0637\u0644\u0627\u0621 \u0627\u0644\u062e\u0632\u0627\u0646 \u0648\u0627\u0644\u0639\u0644\u0628\u0629<\/td>\n<td>ISO 12944 C2\/C3\u060c \u0637\u0628\u0642\u0629 \u0648\u0627\u062d\u062f\u0629<\/td>\n<td>\u0646\u0638\u0627\u0645 \u0637\u0644\u0627\u0621 C4 \u0623\u0648 C5\u060c \u0628\u062d\u062f \u0623\u062f\u0646\u0649 120-240 \u0645\u064a\u0643\u0631\u0648\u0645\u062a\u0631 \u0633\u0645\u0643 \u0627\u0644\u0641\u064a\u0644\u0645 \u0627\u0644\u062c\u0627\u0641<\/td>\n<\/tr>\n<tr>\n<td>\u0645\u0627\u062f\u0629 \u063a\u0644\u0627\u0641 \u0627\u0644\u0639\u0644\u0628\u0629<\/td>\n<td>\u0641\u0648\u0644\u0627\u0630 \u0645\u062f\u0644\u0641\u0646 \u0639\u0644\u0649 \u0627\u0644\u0628\u0627\u0631\u062f\u060c \u0637\u0644\u0627\u0621<\/td>\n<td>\u0641\u0648\u0644\u0627\u0630 \u0645\u0642\u0627\u0648\u0645 \u0644\u0644\u0635\u062f\u0623 (304\/316) \u0623\u0648 \u0645\u062c\u0644\u0641\u0646 \u0628\u0627\u0644\u063a\u0645\u0633 \u0627\u0644\u0633\u0627\u062e\u0646 + \u0637\u0644\u0627\u0621 \u0645\u0633\u062d\u0648\u0642 \u062b\u0642\u064a\u0644<\/td>\n<\/tr>\n<tr>\n<td>\u0627\u0644\u0645\u0633\u0627\u0645\u064a\u0631 \u0648\u0627\u0644\u062a\u062c\u0647\u064a\u0632\u0627\u062a<\/td>\n<td>\u0641\u0648\u0644\u0627\u0630 \u0645\u0637\u0644\u064a \u0628\u0627\u0644\u0632\u0646\u0643<\/td>\n<td>\u0645\u0633\u0627\u0645\u064a\u0631 \u0641\u0648\u0644\u0627\u0630\u064a\u0629 \u0645\u0642\u0627\u0648\u0645\u0629 \u0644\u0644\u0635\u062f\u0623\u060c \u0623\u0648 \u062d\u0648\u0627\u0645\u0644 \u0643\u0627\u0628\u0644\u0627\u062a \u0646\u062d\u0627\u0633\u064a\u0629 \u0623\u0648 \u0641\u0648\u0644\u0627\u0630\u064a\u0629 \u0645\u0642\u0627\u0648\u0645\u0629 \u0644\u0644\u0635\u062f\u0623<\/td>\n<\/tr>\n<tr>\n<td>\u0627\u0644\u0645\u0634\u0639\u0627\u062a \/ \u0632\u0639\u0627\u0646\u0641 \u0627\u0644\u062a\u0628\u0631\u064a\u062f<\/td>\n<td>\u0641\u0648\u0644\u0627\u0630 \u0643\u0631\u0628\u0648\u0646\u064a \u0642\u064a\u0627\u0633\u064a<\/td>\n<td>\u0632\u0639\u0627\u0646\u0641 \u0645\u0637\u0644\u064a\u0629 \u0623\u0648 \u0647\u0627\u0645\u0634 \u062a\u0628\u0631\u064a\u062f \u0645\u062a\u0632\u0627\u064a\u062f \u0644\u062a\u0639\u0648\u064a\u0636 \u0641\u0642\u062f\u0627\u0646 \u0627\u0644\u0637\u0644\u0627\u0621<\/td>\n<\/tr>\n<tr>\n<td>\u0645\u0631\u0634\u062d\u0627\u062a \u062a\u0646\u0641\u0633 \u0647\u0644\u0627\u0645 \u0627\u0644\u0633\u064a\u0644\u064a\u0643\u0627<\/td>\n<td>\u0645\u0639\u064a\u0627\u0631<\/td>\n<td>\u0647\u0644\u0627\u0645 \u0633\u064a\u0644\u064a\u0643\u0627 \u0645\u0646 \u0627\u0644\u062f\u0631\u062c\u0629 \u0627\u0644\u0643\u064a\u0645\u064a\u0627\u0626\u064a\u0629 \u0645\u0639 \u0645\u0624\u0634\u0631 \u0644\u0648\u0646\u060c \u062d\u062c\u0645 \u0623\u0643\u0628\u0631<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The cost impact exists but is limited; moving from C2 to C4 coating typically results in added costs of anywhere from $600 to $2,500 per unit. Adding a stainless steel enclosure shell to a dry type unit that has a rating of 1,000 kVA leads to costs from $3,000 to $8,000. When dealing with critical tunnel infrastructure that cannot be removed from service for repainting, this cost is the cheapest form of insurance available.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10654\" src=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/Point-1-3.webp\" alt=\"Point 1-3\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2 id=\"point3\">Point 3: Ventilation and Condensation Control<\/h2>\n<p>The third criterion is environmental control in the transformer room or enclose. When the surrounding air condenses, no matter how effective is the IP55 enclosure, it will not save the transformer from damage. Possible solutions to this problem listed in order of their effectiveness are the following:<\/p>\n<ul>\n<li>Anti-condensation heaters: of 150\u2013300 W per compartment and regulated by thermostat, anti-condensation heaters enable surfaces to remain 3\u20135 \u00b0C above dew point. Price is between $200 and $600 per compartment.<\/li>\n<li>Controlled ventilation: in a humid tunnel, even natural ventilation system is not helpful; a fan system that is activated only when outdoor air is drier is required. It costs from $1,500 to $5,000.<\/li>\n<li>Dehumidification: in critical rooms, a small dehumidifier ensures that the level of humidity is less than 60%. In this case, it costs from $1,000 to $3,500.<\/li>\n<li>Heated breathers and sealed oil systems: this solution excludes the risk of a moisture ingress for oil-immersed equipment. Price is covered by the above-mention option.<\/li>\n<\/ul>\n<p>The engineering task is simple and straightforward: one should keep the level of humidity in the zone of equipment above 60% and surface temperatures above dew point. These measures should be included into the transformer specifications package and should not be treated as additional civil works, as the transformer manufacturer should be responsible for moisture prevention.<\/p>\n<h2 id=\"types\">Transformer Types for Tunnel Duty<\/h2>\n<p>Both major transformer families can be made tunnel-worthy, but the choice affects cost, footprint, and fire safety:<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0627\u0644\u0646\u0648\u0639<\/th>\n<th>Strengths in Tunnels<\/th>\n<th>Weaknesses<\/th>\n<th>Typical Price, 1,000 kVA (USD)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0646\u0648\u0639 \u062c\u0627\u0641 (\u0631\u0627\u062a\u0646\u062c \u0645\u0635\u0628\u0648\u0628)<\/td>\n<td>No oil leak risk, fire-safe, low maintenance, good moisture performance with proper enclosure<\/td>\n<td>Higher cost, sensitive to sustained high humidity without enclosure<\/td>\n<td>$18,000\u2013$32,000<\/td>\n<\/tr>\n<tr>\n<td>Sealed oil-immersed<\/td>\n<td>Lower cost, proven, sealed tank resists ingress<\/td>\n<td>Oil containment and fire considerations; tank corrosion risk if coating fails<\/td>\n<td>$12,000\u2013$22,000<\/td>\n<\/tr>\n<tr>\n<td>Stainless-steel dry-type<\/td>\n<td>Maximum corrosion resistance, best for salt tunnels<\/td>\n<td>Highest cost<\/td>\n<td>$25,000\u2013$40,000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>In the case of railway tunnel and highway tunnel, the dry transformer is usually the best option in fireproof rooms because in case of a fire in tunnel the transformer can pose a danger and there are not many possibilities for people to escape. In the case of utility duct and underground tunnels where fire risk is managed differently, the best choice will be oil-filled transformers.<\/p>\n<h2 id=\"compare\">Dry-Type vs. Oil-Immersed for Tunnels<\/h2>\n<p>The decision between the two families in a moist tunnel comes down to five factors, summarized below:<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0627\u0644\u0639\u0627\u0645\u0644<\/th>\n<th>Dry-Type (Cast Resin)<\/th>\n<th>Sealed Oil-Immersed<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Moisture handling<\/td>\n<td>Good with IP54+ enclosure; insulation moisture recoverable by drying<\/td>\n<td>Sealed tank resists ingress; oil moisture must be monitored<\/td>\n<\/tr>\n<tr>\n<td>\u0633\u0644\u0627\u0645\u0629 \u0645\u0646 \u0627\u0644\u062d\u0631\u0627\u0626\u0642<\/td>\n<td>Self-extinguishing, minimal smoke<\/td>\n<td>Oil fire risk; needs fire-rated room and containment<\/td>\n<\/tr>\n<tr>\n<td>\u0627\u0644\u0635\u064a\u0627\u0646\u0629<\/td>\n<td>Low; periodic cleaning and thermography<\/td>\n<td>Higher; oil sampling, DGA, breather service<\/td>\n<\/tr>\n<tr>\n<td>Cost (1,000 kVA)<\/td>\n<td>$18,000\u2013$32,000<\/td>\n<td>$12,000\u2013$22,000<\/td>\n<\/tr>\n<tr>\n<td>Typical tunnel use<\/td>\n<td>Road\/rail station and equipment rooms<\/td>\n<td>Utility ducts, remote vaults, mine sites<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>There is no ultimate victor. The selection relies on fire safety criteria and the ability for repair. What is important is that whatever system you choose, it satisfies all three criteria mentioned above: good enclosure protection, corrosion-resisting properties, and removal of any condensation that may occur.<\/p>\n<h2 id=\"specs\">Specification Checklist<\/h2>\n<ul>\n<li>Confirm the tunnel conditions: humidity levels, salt amounts, ventilation, and chemicals applied.<\/li>\n<li>Enclosures and compartments must comply with IP54 at least (it is recommended to comply with IP55 if water is sprayed in tunnel).<\/li>\n<li>ISO 12944 C4 (or C5 for salt tunnels) coating should be specified with dry-film thickness in the contract.<\/li>\n<li>Stainless steel or heavy coated shells should be used if severe corrosion occurs.<\/li>\n<li>Sealed oil preservation should be applied to oil-immersed equipment while dry construction should be utilized in fire-hazard areas.<\/li>\n<li>Anti-condensation heaters, humidity-controlled ventilation with dehumidifying units should be integrated into the project.<\/li>\n<li>Moisture content should also be listed on the data sheet.<\/li>\n<li>Add monitoring: oil moisture sensor, winding temperature sensor, and leak\/condensation sensor.<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10655\" src=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/Specification-Checklist1.webp\" alt=\"Specification Checklist1\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2 id=\"brands\">Top Brands &amp; Price Comparison<\/h2>\n<p>Manufacturers of tunnel-grade transformers include both international leaders and dedicated producers. The table provides prices for 1,000 kVA dry transformers of 10\/0.4 kV with an IP54+ tunnel grade case and C4 treatment; oil-type transformers will be approximately 35-45 percent cheaper.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0627\u0644\u0639\u0644\u0627\u0645\u0629 \u0627\u0644\u062a\u062c\u0627\u0631\u064a\u0629<\/th>\n<th>\u0627\u0644\u062f\u0648\u0644\u0629<\/th>\n<th>Tunnel-Relevant Strengths<\/th>\n<th>Indicative Price (USD)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0634\u0646\u0627\u064a\u062f\u0631 \u0625\u0644\u0643\u062a\u0631\u064a\u0643<\/td>\n<td>\u0641\u0631\u0646\u0633\u0627<\/td>\n<td>Strong dry-type and IP55 enclosure portfolio<\/td>\n<td>$22,000\u2013$34,000<\/td>\n<\/tr>\n<tr>\n<td>\u0633\u064a\u0645\u0646\u0632<\/td>\n<td>\u0623\u0644\u0645\u0627\u0646\u064a\u0627<\/td>\n<td>Tunnel infrastructure references, digital monitoring<\/td>\n<td>$23,000\u2013$36,000<\/td>\n<\/tr>\n<tr>\n<td>ABB<\/td>\n<td>\u0633\u0648\u064a\u0633\u0631\u0627<\/td>\n<td>Broad cast-resin and sealed-tank range<\/td>\n<td>$22,000\u2013$35,000<\/td>\n<\/tr>\n<tr>\n<td>\u0625\u064a\u062a\u0648\u0646<\/td>\n<td>\u0627\u0644\u0648\u0644\u0627\u064a\u0627\u062a \u0627\u0644\u0645\u062a\u062d\u062f\u0629 \u0627\u0644\u0623\u0645\u0631\u064a\u0643\u064a\u0629<\/td>\n<td>Industrial dry-type depth, custom enclosures<\/td>\n<td>$20,000\u2013$32,000<\/td>\n<\/tr>\n<tr>\n<td>\u0647\u064a\u062a\u0627\u0634\u064a \u0644\u0644\u0637\u0627\u0642\u0629<\/td>\n<td>Japan\/Switzerland<\/td>\n<td>Large infrastructure transformer expertise<\/td>\n<td>$24,000\u2013$38,000<\/td>\n<\/tr>\n<tr>\n<td>\u0634\u0631\u0643\u0629 \u062c\u064a\u0627\u0646\u063a\u0633\u0648 \u0633\u0648\u0628\u064a\u0646 \u0644\u0644\u0637\u0627\u0642\u0629 \u0627\u0644\u0643\u0647\u0631\u0628\u0627\u0626\u064a\u0629<\/td>\n<td>\u0627\u0644\u0635\u064a\u0646<\/td>\n<td>IEC 60076-compliant units with IP54\/55, C4 coating, stainless options<\/td>\n<td>$15,000\u2013$26,000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>International manufacturers offer exceptional construction practices and comprehensive documentation expertise which are key requirements for projects that have stringent certifications and insurance requirements. Jiangsu Subian Electric Power is an active participant in this field and manufactures IEC 60076-compliant dry-type and oil-immersed transformers that meet the company-specific specifications like IP55 enclosure, C4\/C5 coating, stainless steel options, anti-condensation heating systems, and moisture monitoring, with a price 45-60% lower than that of their European or American counterparts. When it comes to the evaluation of the options for the construction of multiple transformer rooms for ventilation, lighting, and drainage, Subian is presented as a worthy alternative to international companies due to its flexibility in producing customized products and great factory-test witnessing system.<\/p>\n<h2 id=\"faq\">\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0645\u062a\u0643\u0631\u0631\u0629<\/h2>\n<h3>What IP rating do I need for a transformer in a tunnel?<\/h3>\n<p>The minimum acceptable IP rating for a transformer is IP54, but IP55 is preferable if the transformer will be exposed to water due to cleaning, or water leakages. The meaning of an IP54 rating is that it is dust-tight and protects against splashes of water from any direction. In contrast, IP55 protects against water jets used for cleaning. Installing equipment that operates to a higher IP rating than IP23 costs at least $400\u2013$1,500 more.<\/p>\n<h3>How much does a tunnel-grade transformer cost compared to a standard one?<\/h3>\n<p>The cost of a standard 1000 kVA dry-type transformer can reach $13,000\u2013$18,000. The cost of a tunnel-grade transformer with an IP54\/55 enclosure, C4 coating, and condensation controls is $18,000\u2013$32,000, which means a premium of 15\u201330%. In addition, stainless steel shells add an extra $3,000\u2013$8,000. However, this is a small premium when the total costs are compared with the costs of its mid-life replacement for a critical tunnel infrastructure.<\/p>\n<h3>Is a dry-type or oil-immersed transformer better in a moist tunnel?<\/h3>\n<p>For road and rail tunnels where fire protection is sensitive, the dry-type transformer (cast resin) is the preferred choice, as it is self-extinguishing and poses no risk of spillage of oil. On the other hand, oil-immersed transformers are more cost-efficient for utility ducts, mine workings, and non-access vaults. Thus, it is important to understand that fire protection, maintenance access, and costs are the main determining issues in choosing a transformer type.<\/p>\n<h3>What moisture level in transformer oil is acceptable?<\/h3>\n<p>It is considered that moisture content in transformer oil during the delivery period should not exceed 15-20 ppm. In operation, the oil moisture content is acceptable if it does not exceed 30 ppm. If it ranges from 30 to 50 ppm, more monitoring is required. When the moisture level exceeds 50 ppm, there is a potential risk of formation air bubbles during the operation of the transformer.<\/p>\n<h3>Do anti-condensation heaters really prevent transformer failure?<\/h3>\n<p>Yes, and they are among the best measures of cost-efficiency mentioned in this article. These heaters operate using a thermostat and cost $200-$600.<\/p>\n<h2 id=\"references\">\u0627\u0644\u0645\u0631\u0627\u062c\u0639<\/h2>\n<ul>\n<li><a href=\"https:\/\/webstore.iec.ch\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60529 \u2014 Degrees of protection provided by enclosures (IP Code)<\/a> \u2014 the standard defining IP ratings for transformer enclosures and compartments.<\/li>\n<li><a href=\"https:\/\/iec.ch\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60076 series \u2014 Power transformers<\/a> \u2014 base design, testing, and insulation standards for all tunnel transformer specifications.<\/li>\n<li><a href=\"https:\/\/www.iso.org\/standard\/64556.html\" rel=\"nofollow noopener\" target=\"_blank\">ISO 12944 \u2014 Paints and varnishes: Corrosion protection of steel structures<\/a> \u2014 the corrosivity classification (C2\u2013C5) used for tunnel coating specifications.<\/li>\n<li><a href=\"https:\/\/ieeexplore.ieee.org\/document\/8898732\" rel=\"nofollow noopener\" target=\"_blank\">IEEE C57.106 \u2014 Guide for Acceptance and Maintenance of Insulating Mineral Oil<\/a> \u2014 authoritative guidance on oil moisture limits and interpretation.<\/li>\n<li><a href=\"https:\/\/webstore.iec.ch\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60076-11 \u2014 Dry-type power transformers<\/a> \u2014 moisture and enclosure requirements for cast-resin units in humid environments.<\/li>\n<li><a href=\"https:\/\/www.arema.org\" rel=\"nofollow noopener\" target=\"_blank\">AREMA Manual for Railway Engineering<\/a> \u2014 tunnel electrical and ventilation infrastructure guidance used in North American rail projects.<\/li>\n<li><a href=\"https:\/\/subian-electric.com\/ar\/\" rel=\"nofollow\">Jiangsu Subian Electric Power \u2014 official site<\/a> \u2014 manufacturer of IP54\/55, C4-coated tunnel-grade transformers for infrastructure projects.<\/li>\n<\/ul>\n<h2 id=\"conclusion\">\u0627\u0644\u062e\u0627\u062a\u0645\u0629<\/h2>\n<p>Moisture can damage a transformer, but you can reduce the chances of this problem happening by following some recommendations. Recommendation number one is to install the transformer inside a sealed enclosure (IP54 or higher) with waterproof installation. The second suggestion is to coat steel parts of the transformer with materials that can withstand corrosion and humidity (preferably, ISO 12944 C4\/classification degree coating will be appropriate). The third recommendation is to provide ventilation, heating systems, and humidity control (dehumidifiers).<\/p>\n<p>Key points:<\/p>\n<ul>\n<li>IP23\/IP31 enclosures are not good for operation in tunnels; IP54\/IP55 is a must.<\/li>\n<li>Ensure the use of C4 coating (C5 for salt-tunnels) to protect the transformer from corrosion according to ISO 12944.<\/li>\n<li>You still need to pay an additional 15\u201330% for a transformer rated for tunnel operation when buying it; this way you will be ensured that you will have a reliable device for 25 years instead of a malfunctioning one for only 5 years.<\/li>\n<li>Provide the transformer with heating and humidity control: this will help avoid the humidity-related problems while operating the transformer.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>If you visit the switch-room in between the two ends of an urban highway tunnel in the middle of the summer season and see its condition, you would get the answer. The 800kVA transformer, which is the main source of the power of ventilation and lighting system of the tunnel, is located inside a room [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":10653,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[77],"tags":[],"class_list":["post-10651","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/subian-electric.com\/ar\/wp-json\/wp\/v2\/posts\/10651","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/subian-electric.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/subian-electric.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/subian-electric.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/subian-electric.com\/ar\/wp-json\/wp\/v2\/comments?post=10651"}],"version-history":[{"count":2,"href":"https:\/\/subian-electric.com\/ar\/wp-json\/wp\/v2\/posts\/10651\/revisions"}],"predecessor-version":[{"id":10909,"href":"https:\/\/subian-electric.com\/ar\/wp-json\/wp\/v2\/posts\/10651\/revisions\/10909"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/subian-electric.com\/ar\/wp-json\/wp\/v2\/media\/10653"}],"wp:attachment":[{"href":"https:\/\/subian-electric.com\/ar\/wp-json\/wp\/v2\/media?parent=10651"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/subian-electric.com\/ar\/wp-json\/wp\/v2\/categories?post=10651"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/subian-electric.com\/ar\/wp-json\/wp\/v2\/tags?post=10651"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}