Abstract: A large number of low-efficiency transformers are in use in power distribution network in China and replacing them needs a large amount of investment. The CDM project can effectively reduce the investment pressure and shorten the recovery time. In the case of the Jiangxi provincial 10 kV distribution network, which uses a new-type of energy-saving transformers to replace the S7-type high loss distribution transformers, the CDM project methodology AM0067 algorithm is used to calculate the greenhouse gas emission reduction, energy saving and investment recovery period by replacing the high-consumption S7 series transformers with the S11-M series, SH11-M series, S13-M series and SH15-M series power transformers respectively. A optimal scheme is selected, which uses the S13-M-series transformers to replace S7-type transformers, and compared with the S7-type transformer, the S13-M-series transformer can save an annual energy of 433 million kW·h. The recovery period of the CDM project is 13~15 years.

Key words: distribution network, energy-saving transformer, clean development mechanism (CDM), AM0067 mechodology