GB/T 23755-2020Three-phase site-combined power transformer (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 23755-2009 "Three-phase combined power transformer", compared with GB/T 23755-2009, the main technology The changes are as follows.

---For 110kV and 220kV three-phase combined power transformers, the capacity of 40000kVA and 50000kVA has been increased. Quantity specifications and performance parameters (see 6.1.1 and 6.1.2);

---Added 330kV class three-phase combined power transformer related capacity specifications and performance parameters (see 6.1.3);

---The performance parameters of 110kV, 220kV and 500kV three-phase combined power transformers have been modified, no-load loss And load loss decreased by about 20% and 5% respectively, and the no-load current decreased by about 20% respectively (see 6.1, 2009 Version 6.1);

---Modified the parameter values of voltage and short-circuit impedance in some performance parameter tables (see Table 2~Table 13 and Table 17, 2009 Version Table 2~Table 13 and Table 17);

---The technical requirements have been revised uniformly (see Chapter 7 and Chapter 8, Chapter 7 of the 2009 edition).

1 Scope

This standard stipulates that the rated capacity is 40000kVA and above, the nominal voltage of the system is 110kV~500kV, and the rated frequency is 50Hz three-phase combined power transformer terms and definitions, use conditions, product models, basic parameters, structural requirements, technical requirements, name Licenses, allowable deviations, inspection rules and methods, signs, lifting, packaging, transportation, installation and storage.

This standard applies to oil-immersed three-phase combined power transformers used in substations or power plants with restricted transportation conditions or layout sites. Depressor.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document.

GB/T 1094.1 Power Transformer Part 1: General Rules

GB/T 1094.2 Power Transformer Part 2: Temperature Rise of Liquid-immersed Transformer

GB/T 1094.3 Power Transformer Part 3: Insulation Level, Insulation Test and External Insulation Air Gap

GB/T 1094.5 Power Transformer Part 5: Ability to withstand short circuit

GB/T 1094.7 Power Transformer Part 7: Load Guidelines for Oil-immersed Power Transformers

GB/T 1094.10 Power Transformer Part 10: Sound Level Measurement

GB/T 2900.95 Electrotechnical terminology transformer, voltage regulator and reactor

GB/T 6451 Oil-immersed power transformer technical parameters and requirements

JB/T 501 Power Transformer Test Guide

JB/T 3837 Modeling method for transformer products

JB/T 10088 6kV~1000kV power transformer sound level

3 Terms and definitions

The following terms and definitions defined in GB/T 1094.1 and GB/T 2900.95 apply to this document.