vd4
- VD4型;【医】【=22，23-dihydroergocalciferol】维生素D4，22，23-双氢麦角钙化醇
vd4-
Analysis and Fault Handling of Frequent Burn-out of Closing Coils for Type VD4 Vacuum Circuit Breaker
VD4型真空断路器合闸线圈烧毁的故障分析
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Improvement and Analysis of Burnt down Phenomenon of a Locking Solenoid Electromagnet for Type VD4 Vacuum Circuit Breaker
VD4型真空断路器合闸闭锁电磁铁烧毁现象分析及改进
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The results showed that VD4 had higher monomers conversion and monomers grafting rate than D4 in graft copolymerization reaction .
结果表明：VD4接枝改性天然胶乳的转化率和接枝率均比D4的要高；
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Nowadays , Large quantities of VD4 Vacuum Circuit Breakers have been installed in the Power Station , and satisfactory effects have gained .
VD4真空断路器已在电站获得了批量应用，取得了优异的使用效果。