GB/T 23755-2020 in English
VALIDThree-phase site-combined power transformer
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 5 business days
$301.00
《GB/T 23755-2020三相组合式电力变压器》由TC44（全国变压器标准化技术委员会）归口，主管部门为中国电器工业协会。
Introduction
Standard Evolution and Technological Breakthroughs
| Version | Core Improvements | Energy Efficiency Improvements | New Contents |
|---|---|---|---|
| 2009 Edition | Basic Specifications | — | 110-500kV Basic Parameters |
| 2020 Edition | Average Losses Reduced by 20% | No-load Current Reduced by 20% | 330kV Class Parameters/40-50MVA Capacity Expansion |
Core Parameters Comparative Analysis
Typical Product Performance Comparison
| Capacity Range (kVA) | Voltage Level (kV) | No-load Loss (kW) | Load Loss (kW) | Short-circuit Impedance (%) |
|---|---|---|---|---|
| 40,000-180,000 | 110 | 33-100 | 148-460 | 12-14 |
| 90,000-720,000 | 330 | 75-366 | 274-1347 | 14-16 |
| 360,000-860,000 | 500 | 200-430 | 882-1750 | 16±1 |
Special structural requirements
The three-phase combined transformer adopts a split-phase unit design. Each unit contains an independent magnetic circuit and oil tank.>interphase pipelines to achieve electrical connection. Key features include:
- Modular transportation: Maximum single piece transportation weight ≤400 tons (500kV level)
- Cooling system: Optional centralized or distributed cooling solutions
- Voltage regulation method: Three-phase synchronous voltage regulation system error ≤1.25%
Adaptability to plateau environment
| Altitude (m) | Air pressure (kPa) | Temperature rise correction factor | Insulation correction requirements |
|---|---|---|---|
| ≤1000 | 101.3 | 1.00 | — |
| 3000 | 70.1 | 1.15 | External insulation distance +12% |
| 5000 | 54.0 | 1.30 | Special bushing sealing design |
Implementation suggestions
Selection guide
- Preferably use the off-excitation voltage regulation structure (tap changer failure rate reduced by 60%)
- For 500kV level, it is recommended to use the YNd11 connection group
- When the capacity is ≥240MVA, a three-winding autocoupler structure is recommended
Installation points
- Foundation settlement control: differential settlement ≤3mm/10m
- Interphase pipeline sealing test: 0.25MPa/30min without leakage
- Transport impact monitoring: three-dimensional acceleration ≤3g
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