| 1. | Verification regulation of digit industrial frequency meter model pp27
Pp27数字工频频率计试行检定规程 |
| 2. | Industrial frequency inductors
工频电感器 |
| 3. | Vulcanized rubber - test method for industrial frequency puncture voltage and dielectric strength
硫化橡胶工频击穿介电强度和耐电压的测定方法 |
| 4. | Vulcanized rubber - determination for industrial frequency dielectric constant and dielectric loss angular tangent
硫化橡胶工频介电常数和介质损耗角正切值的测定方法 |
| 5. | Since the industrial frequency transformer fulfills the boosting voltage part , most of the inverters have such drawbacks as larger size , more weight and bigger ac noise
目前，大多数户用光伏逆变电源产品存在着体积、重量、交流噪音大等不足之处，原因在于升压环节由工频变压器实现。 |
| 6. | Industrial frequency traction current may interference fsk signal . the electric parameters of track circuit must be measured periodically to make sure whether track circuits and signal equipment run normally and to avoid accident
定期检测轨道电路的电压、频率等参数，以判断轨道电路及其信号设备是否处于最佳工作状态，可以及时消除隐患，确保铁路安全行车。 |
| 7. | This controllable compound excitation is suitable for the small moveable power station driving by internal combustion engine , the land or marine generating sets for the industrial frequency power of moving force or lightening also can be used for power generator in other stage
该相复励发电机适用于由内燃机拖动组成移动电站、陆用发电机组、作为动力或照明的工频电源，亦可用于其它场合作为电源发电机。 |
| 8. | With the development of power electronics technology and devices in recent years , instead of using the industrial frequency transformer to boost voltage , dc / dc high frequency converter achieves the function . the system has higher power density and conversion efficiency , and the size , weight , ac noise of which has been greatly reduced
近年来，随着电力电子技术与器件的迅速发展，使用dc dc高频变换技术代替工频升压，系统具有较高的功率密度与转换效率，装置体积、重量与交流噪声大大减小。 |
| 9. | With the application of phase detector in industrial experiment on the spot , when the phase of working frequency power supply is consistent with the output phase of variable frequency power supply , plc sends out the instruction to switch off the output of transducer . the electromotor is connected with the industrial frequency voltage after it was disconnected from the out
在现场工业试验引入鉴频鉴相控制器，在工频电源和变频输出电源相位一致时， plc发出指令切断变频器输出，电机从变频器输出端断开后，马上接入工频电源，转换时间控制在几十毫秒之内。 |
