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七十年代初期由法国引进的6G型电力机车于1973年正式投入使用。经过五年的运用(走行50～60万公里),该型机车所用的TAO649C_1型牵引电动机(简称C_1电机)首先在电枢部分陆续发生接地故障。根据1977～1979三年的统计,出现接地及匝间短路的电枢计有119台,其中匝间短路28台。除了在运用中出现接地损坏的以外,还有在架修耐压试验时击穿的,三年合计50台。因此,三年来损坏的电枢有169台。如果再计及1977年以前零星损坏的和1980年头八个月接地损坏的。则电枢损坏的总数将近240台,占全部电枢台数(包括备品)的76％。
The 6G electric locomotive introduced by France in the early 1970s was officially put into use in 1973. After five years of operation (about 500,000 to 600,000 km), the TAO649C_1 traction motor (referred to as C_1 motor) used in the locomotive firstly grounded in the armature portion one after another. According to statistics from 1977 to 1979, there are 119 armatures with earthing and inter-turn short circuits, of which 28 are inter-turn short circuits. In addition to the occurrence of damage to the ground in the operation, there are breakdown in the repair pressure test, a total of 50 three years. As a result, 169 armatures have been damaged in three years. If you re-calculate the damaged ground before 1977 and the damaged ground in the first eight months of 1980. The total number of armature damage will be nearly 240, accounting for 76% of the total number of armatures (including spare parts).