This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.
This document replaces GB/T 10228-2009 Technical parameters and requirements for dry-type power transformers. In addition to structural adjustments and editorial, the following main technical changes have been made with respect GB/T 10228-2009:
—— The no-load loss of 6 kV / 10 kV de-energized voltage-regulating distribution transformers is reduced by about 20% on average, and the no-load current (rated capacity of 250 kVA and above) is reduced by about 20% on average (Table 1 herein; Table 1 of Edition 2015);
—— The no-load loss of 6 kV / 10 kV de-energized voltage-regulating power transformers is reduced by about 20% on average, and the no-load current is reduced by about 20% on average (Table 2 herein; Table 2 of Edition 2015);
—— The no-load loss of 6 kV / 10 kV on-load voltage-regulating distribution transformers is reduced by about 20% on average, and the no-load current is reduced by about 20% on average (Table 3 herein; Table 3 of Edition 2015);
—— The no-load loss of 20 kV de-energized voltage-regulating distribution transformers is reduced by about 10% on average, and the no-load current is reduced by about 10% on average (Table 4 herein; Table 4 of Edition 2015);
—— The no-load loss of 35 kV de-energized voltage-regulating distribution transformers is reduced by about 10% on average, and the no-load current is reduced by about 10% on average (Table 5 herein; Table 5 of Edition 2015);
—— The no-load loss of 35 kV de-energized voltage-regulating power transformers is reduced by about 10% on average, and the no-load current is reduced by about 10% on average (Table 6 herein; Table 6 of Edition 2015);.
—— The no-load loss of 35 kV on-load voltage-regulating power transformers is reduced by about 10% on average, and the no-load current is reduced by about 10% on average (Table 7 herein; Table 7 of Edition 2015);
—— Text "different insulation system temperatures" is changed to "different Thermal insulation grades", and the expression form is revised (Clause 4 herein; Clause 4 of Edition 2015);
—— The inspection rules and methods are modified (Clause 6 hereof; Clause 6 of Edition 2015).
This document was proposed by China Electrical Equipment Industry Association.
This document is under the jurisdiction of the National Technical Committee on Transformers of Standardization Administration of China (SAC/TC 44).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
Specification and technical requirements for dry-type power transformers
1 Scope
This Document specifies the performance parameters, technical requirements, inspection rules and methods, marking, lifting, packaging, transportation and storage of dry-type power transformers.
This Document is applicable to de-energized or on-load voltage-regulating three-phase dry-type power transformers with a rated power of 30 kVA and above, a rated frequency of 50 Hz, a voltage class of 6 kV, 10 kV, 20 kV or 35 kV, equipped with electrical steel core for indoor use.
This Document is applicable to gas-filled transformers.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the Edition cited applies. For undated references, the latest Edition (including any amendments) applies.
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 1094.1 Power transformers - Part 1: General
GB/T 1094.11 Power transformers - Part 11: Dry-type transformers
GB/T 1094.12 Power transformers - Part 12: Loading guide for dry-type power transformers
GB/T 2900.95 Electrotechnical terminology—transformers, voltage regulators and reactors
GB/T 5273 Dimensional standardization of terminals for high-voltage apparatus
GB/T 5465.2 Graphical symbols for use on electrical equipment - Part 2: Graphical symbols
JB/T 501 Test guide for power transformers
JB/T 10088 Sound level for 6kV~1000kV power transformers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 1094.1, GB/T 1094.11 and GBT 2900.95 and the following apply.
3.1
power transformer
transformer that transforms the AC voltage and current values of a power system into different voltages and currents of another power system to deliver electrical energy
3.2
distribution transformer
power transformation for distribution that regulates higher voltages to the last-level distribution voltages
4 Performance parameters
4.1 Rated power, voltage combination, tapping range, connection symbol, no-load loss, load loss, no-load current and short-circuit impedance of dry-type power transformers shall meet those specified in Tables 1 to 3.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Performance parameters
