The gas protection is one of the main protections of oil-immersed power transformer, and its correct operation is very important to the operation of the transformer. This article, through the analysis of false action accident of the main transformer heavy gas protection, found the cause of false action of heavy gas protection, that was the hybrid junction of AC and DC power supply in the design, and put forward the countermeasures from the factor.%瓦斯保护是油浸式电力变压器的主保护之一，它的正确动作对变压器的运行至关重要。本文通过对一次变压器重瓦斯保护误动作事故的分析，找到了导致重瓦斯保护误动作的原因，是由于在设计时使得交直流电源混接而导致重瓦斯保护误跳闸，由此因素入手提出了对策措施。
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