润色这段话通常考虑到系统或机组的同步并列要求以及3次谐波对电源的影响等因素。因此一般采用YN、d11常规接线取代全星形接线变压器。全星形接线变压器通常用于中性点不接地系统。但由于这种接线方式下3次谐波无通路会引起正弦波电压畸变并对通信设备产生干扰同时还会影响继电保护整定的准确度和灵敏度。而在中国全星形接线变压器多采用自耦变压器其电压变比为22011035、33022035、33011035、500

When considering the synchronization and parallel requirements of a system or unit, as well as the impact of third harmonic on the power supply, YN and d11 conventional wiring are generally used instead of full-star wiring transformers. Full-star wiring transformers are usually used in systems where the neutral point is not grounded. However, this wiring method does not provide a path for third harmonic, which can cause distortion of the sine wave voltage and interfere with communication equipment, while also affecting the accuracy and sensitivity of relay protection settings. In China, full-star wiring transformers are often self-coupled transformers with voltage ratios of 220/110/35, 330/220/35, 330/110/35, and 500/220/110kV. However, since 500kV, 330kV, 220kV, and 110kV are all neutral-point grounded systems, the use of a delta winding to divert the third harmonic is no longer necessary