Raytron Technical Review RESEARCH ARTICLE cca-transformer

CCA变压器绕组设计指南

CCA for Transformer Windings: Design Guidelines

RAYTRON技术团队¹ *

¹RAYTRON集团技术研究中心, 中国

^*通讯作者

收稿: 2025年12月接受: 2026年2月发布: 2026年3月

DOI: 10.1234/raytron.2026.WP-02-08

1. 引言

CCA可用于某些变压器应用。

2. 变压器要求

2.1 效率标准

2.2 温升限制

3. 损耗分析

3.1 铜损耗

P_cu = I²R = I²ρL/A

(1)

对于CCA-62%，电阻约高60%：P<sub>CCA</sub> ≈ 1.60 × P<sub>Cu</sub>

创建变压器损耗分布图

MEDIA TODO

Figure Fig. 1 变压器损耗分布图

4. 热考量

创建温升对比曲线

MEDIA TODO

Figure Fig. 2 温升对比曲线

5. 设计指南

6. 结论

CCA适用于小型、高频和音频变压器应用，需要仔细的热和效率分析。

常见问题

How does CCA affect transformer efficiency?

CCA-62% has approximately 60% higher resistance than copper, resulting in 60% higher copper losses. This typically reduces transformer efficiency by 1.2-1.5%, which may challenge compliance with DOE 2016 and EU Tier 2 efficiency standards.

What types of transformers can use CCA?

CCA is most suitable for small transformers, audio transformers, and high-frequency transformers where efficiency requirements are less stringent. Large power transformers (>10 kVA) and high-efficiency designs are generally not suitable for CCA.

What temperature limitations apply to CCA in transformers?

CCA is suitable for Class A (105°C) insulation with normal temperature rise. Class B (130°C) requires caution. Class F (155°C) and Class H (180°C) applications are generally not recommended due to thermal expansion differences between copper and aluminum.

Can CCA transformers meet DOE efficiency standards?

Meeting DOE 2016 efficiency standards (97-99%) with CCA is challenging. Careful design optimization, larger conductor sizing, and reduced current density may help, but often copper is required for compliance.

图表

创建变压器损耗分布图

Fig. 1 变压器损耗分布图

创建温升对比曲线

Fig. 2 温升对比曲线

表格

Table 1 CCA变压器适用性

应用	CCA适用性
小型变压器	可能
音频变压器	良好
高频变压器	良好
电力变压器(>10kVA)	有限
高效率变压器	不推荐

Table 2 效率标准

标准	最低效率	CCA影响
DOE 2016 (美国)	97-99%	挑战
EU Tier 2	95-98%	挑战
定制	变化	逐案评估

Table 3 温升限制

绝缘等级	最高温升	CCA考量
A (105°C)	55°C	OK
B (130°C)	80°C	谨慎
F (155°C)	105°C	有限
H (180°C)	125°C	不推荐

Table 4 效率影响

变压器	铜损耗	CCA-62%损耗	效率影响
1 kVA	25W	40W	-1.5%
10 kVA	200W	320W	-1.2%

参考文献

IEEE IEEE C57: Transformer Standards IEEE (2020)
DOE DOE 2016 Transformer Efficiency DOE (2016)

权威参考链接

ASTM International IEC (International Electrotechnical Commission) ISO (International Organization for Standardization) SAE International IEEE