What to pay attention to when adjusting the arc suppression coil
Posted by: admin Release time: 2019-2-16
The tuning method of the arc suppression coil used in China's field is to manually adjust the taps of the arc suppression coil according to the established scheme, so that the degree of detuning, residual current and neutral point displacement voltage of the power grid are within the specified range. . This method needs to disconnect the arc suppression coil from the power grid, and manually adjust the taps of the arc suppression coil. For complex power grids, determining the tuning scheme is quite time-consuming. This adjustment method cannot track the changes of the system parameters automatically, which is extremely inconvenient for adjustment and operation.Because it cannot guarantee a reasonable degree of detuning, an overvoltage accident still occurs after the arc suppression coil is installed. The arc coil adjustment compensation degree compiles complicated operation operating procedures, which increases the burden on the operating personnel. The automatic tracking compensation arc suppression device is to change the inductance of the arc suppression coil according to the change of the grid capacitance current by the automatic device, so that the single-phase grounding capacitor current can be effectively compensated from the inductance current of the arc suppression coil. The working principle of the automatic device is based on the online real-time measurement of the voltage and current signals of the neutral point of the power grid, and based on the relationship between the grid detuning degree and the signal phase angle. The position of the pressure type arc suppression coil is automatically tracked and tuned, so that the system always runs within the set detuning range. In China, the theoretical analysis and application technology research of the arc suppression coil grounding method for distribution network have been carried out in China. According to the current development of controllable reactors, several sets of automatic tracking compensation arc suppression voltage limiting devices have been introduced accordingly.