Standard No.:	GB/T 6451-2015
English Name:	Specification and technical requirements for oil-immersd power transformers
Chinese Name:	油浸式电力变压器技术参数和要求
Chinese Classification:	K41    Transformer
Professional Classification:	GB    National Standard
Issued by:	AQSQA AND SAC
Issued on:	2015-09-11
Implemented on:	2016-4-1
Status:	valid
Superseding:	GB/T 6451-2008 Specification and technical requirments for oil-immersed power transformers
Language:	English
File Format:	PDF
Word Count:	27000 words
Price(USD):	810.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the performance parameters, technical requirements, inspection rules and methods, marking, lifting, packaging, transportation and storage of oil-immersed power transformers. This standard is applicable to three-phase oil-immersed power transformers with rated power of 30 kV·A and above, rated frequency of 50 Hz and voltage classes of 6 kV, 10 kV, 35 kV, 66 kV, 110 kV, 220 kV, 330 kV and 500 kV, and single-phase oil-immersed power transformers with voltage class of 500 kV. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB 1094.1 Power transformers—Part 1: General GB 1094.2 Power transformers—Part 2: Temperature rise GB 1094.3 Power transformers—Part 3: Insulation levels, dielectric tests and external clearances in air GB 1094.5 Power transformers—Part 5: Ability to withstand short circuit GB/T 1094.7 Power transformers—Part 7: Loading guide for oil-immersed power transformers GB/T 2900.95 Electrotechnical terminology—transformers, voltage regulators and reactors JB/T 10088 Sound level for 6 kV~500 kV power transformers 3 Terms and definitions For the purposes of this document, the terms and definitions given in YB/T 2900.95 apply. 4 Voltage class 6 kV, 10 KV 4.1 Performance parameters Rated power, voltage combination, tapping range, connection symbol, no-load loss, load loss, no-load current and short-circuit impedance shall meet those specified in Tables 1 to 3.

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Voltage class 6 kV, 10 KV 4.1 Performance parameters 4.2 Technical requirements 4.3 Inspection rules and methods 4.4 Marking, lifting, packaging, transportation and storage 5 Voltage class 35 kV 5.1 Performance parameters 5.2 Technical requirements 5.3 Inspection rules and methods 5.4 Marking, lifting, packaging, transportation and storage 6 Voltage class 66 kV 6.1 Performance parameters 6.2 Technical requirements 6.3 Inspection rules and methods 6.4 Marking, lifting, packaging, transportation and storage 7 Voltage class 110 kV 7.1 Performance parameters 7.2 Technical requirements 7.3 Inspection rules and methods 7.4 Marking, lifting, packaging, transportation and storage 8 Voltage class 220 kV 8.1 Performance parameters 8.2 Technical requirements 8.3 Inspection rules and methods 8.4 Marking, lifting, packaging, transportation and storage 9 Voltage class 330 kV 9.1 Performance parameters 9.2 Technical requirements 9.3 Inspection rules and methods 9.4 Marking, lifting, packaging, transportation and storage 10 Voltage class 500 kV 10.1 Performance parameters 10.2 Technical requirements 10.3 Inspection rules and methods 10.4 Marking, lifting, installation, transportation and storage Annex A (Normative) Test negotiated between user and manufacturer A.1 Long time no-load test A.2 Oil flow electrostatic test A.3 Partial discharge measurement when the oil pump is rotated Figure 1 Position of bracket at the tank bottom of 6 kV and 10 kV class (facing long axis direction) Figure 2 6 kV and 10 kV double-winding transformer with connection symbol of Dyn11, Yzn11 and Yyn0 Figure 3 6 kV and 10 kV double-winding transformer with connection symbol of Yd11 or Dy11 Figure 4 Position 1 of bracket at the tank bottom of 35 kV class (facing long axis direction) Figure 5 Position 2 of bracket at the tank bottom of 35 kV class (facing long axis direction) Figure 6 35 kV double-winding transformer with connection symbol of Dyn11 and Yyn0 Figure 7 35kV double-winding transformer with connection symbol of Yd11 Figure 8 35kV double-winding transformer with connection symbol of YNd11 Figure 9 Position 1 of bracket at the tank bottom of 66 kV class (facing long axis direction) Figure 10 Position 2 of bracket at the tank bottom of 66 kV class (facing long axis direction) Figure 11 66 kV double-winding transformer with connection symbol of YNd11 Figure 12 66 kV double-winding transformer with connection symbol of Yd11 Figure 13 Position 1 of bracket at the tank bottom of 110 kV class (facing long axis direction) Figure 14 Position 2 of bracket at the tank bottom of 110 kV class (facing long axis direction) Figure 15 110 kV double-winding transformer with connection symbol of YNd11 Figure 16 110 kV three-winding transformer with connection symbol of YNyn0d11 Figure 17 220 kV class double-winding transformer with low-voltage of 6.3 kV–21 kV and connection symbol of YNd11 Figure 18 220 kV class double-winding transformer with low-voltage of 36 kV–69 kV and connection symbol of YNd11 Figure 19 220 kV three-winding transformer with connection symbol of YNyn0d11 Figure 20 220 kV three-winding auto-transformer with connection symbol of YNa0d11 Figure 21 330 kV double-winding transformer with connection symbol of YNd11 Figure 22 330 kV three-winding auto-transformer with connection symbol of YNa0d11 Figure 23 330 kV three-winding transformer with connection symbol of YNyn0d11 Table 1 30 kV·A–2,500 kV·A three-phase double-winding de-energized voltage regulating distribution transformers of 6 kV and 10 kV classes Table 2 630 kV·A–6,300 kV·A three-phase double-winding de-energized voltage regulating power transformers of 6 kV and 10 kV classes Table 3 200 kV·A–2,500 kV·A three-phase double-winding on-load voltage regulating distribution transformers of 6 kV and 10 kV classes Table 4 50 kV·A–2,500 kV·A three-phase double-winding de-energized voltage regulating distribution transformers of 35 kV class Table 5 630 kV·A–31,500kV·A three-phase double-winding de-energized voltage regulating power transformers of 35 kV class Table 6 2,000 kV·A–31,500 kV·A three-phase double-winding on-load voltage regulating power transformers of 35 kV class Table 7 Vacuum degree and positive pressure values of 35 kV oil tank Table 8 630 kV·A–63,000 kV·A three-phase double-winding de-energized voltage regulating power transformers of 66 kV class Table 9 6,300 kV·A–63,000 kV·A three-phase double-winding on-load voltage regulating power transformers of 66 kV class Table 10 Vacuum degree and positive pressure values of 66 kV oil tank Table 11 6,300 kV·A–180,000 kV·A three-phase double-winding de-energized voltage regulating power transformers of 110 kV class Table 12 6,300 kV·A–63,000 kV·A three-phase three-winding de-energized voltage regulating power transformers of 110 kV class Table 13 6,300 kV·A–63,000 kV·A three-phase double-winding on-load voltage regulating power transformers of 110 kV class Table 14 6,300 kV·A–63,000 kV·A three-phase three-winding on-load voltage regulating power transformers of 110 kV class Table 15 6,300 kV·A–63,000 kV·A three-phase double-winding de-energized voltage regulating power transformers (35 kV for LV) of 110 kV class Table 16 31,500 kV·A–420,000 kV·A three-phase double-winding de-energized voltage regulating power transformers of 220 kV class Table 17 31,500 kV·A–300,000 kV·A three-phase three-winding de-energized voltage regulating power transformers of 220 kV class Table 18 31,500 kV·A–240,000 kV·A three-phase double-winding de-energized voltage regulating power transformers of 220 kV class (low voltage is 66kV class) Table 19 31,500 kV·A–240,000 kV·A three-phase three-winding de-energized voltage regulating auto power transformers of 220 kV class Table 20 31,500 kV·A–240,000 kV·A three-phase double-winding on-load voltage regulating power transformers of 220 kV class Table 21 31,500 kV·A–240,000 kV·A three-phase three-winding on-load voltage regulating power transformers of 220 kV class Table 22 31,500 kV·A–240,000 kV·A three-phase three-winding on-load voltage regulating auto power transformers of 220 kV class Table 23 90,000 kV·A–720,000 kV·A three-phase double-winding de-energized voltage regulating power transformers of 330 kV class Table 24 90,000kV·A–240,000 MV·A three-phase three-winding de-energized voltage regulating power transformers of 330 kV class Table 25 90,000 kV·A–360,000 kV·A three-phase three-winding de-energized voltage regulating auto power transformers of 330 kV class (serial winding voltage regulation) Table 26 90,000 kV·A–360,000 kV·A three-phase three-winding on-load voltage regulating auto power transformers of 330 kV class (serial winding end voltage regulation) Table 27 90000 kV·A–360,000 kV·A three-phase three-winding on-load voltage regulating auto power transformer of 330 kV class (voltage regulation I at medium-voltage line end) Table 28 90,000kV·A–360,000·kV A three-phase three-winding de-energized voltage regulating auto power transformer of 330 kV class (voltage regulation at medium-voltage line end) Table 29 90000 kV·A–360,000 kV·A three-phase three-winding on-load voltage regulating auto power transformer of 330 kV class (voltage regulation II at medium-voltage line end) Table 30 100 MV·A–484 MV·A single-phase double-winding de-energized voltage regulating power transformers of 500 kV class Table 31 120 MV·A–1,170 MV·A three-phase double-winding de-energized voltage regulating power transformers of 500 kV class Table 32 120 MV·A–400 MV·A single-phase three-winding de-energized voltage regulating auto power transformer of 500 kV class (voltage regulation at medium-voltage line end) Table 33 120 MV·A–400 MV·A single-phase three-winding on-load voltage regulating auto power transformer of 500 kV class (voltage regulation at medium-voltage line end)