I. Routine maintenance and inspection(1) Appearance inspection of switch cabinet.The switch cabinet shell has no deformation or damage; the protective paint has no serious rust, damage or peeling; the cabinet is firmly installed and the appearance is clean and free of debris; the nameplate and logo

Single-phase distribution transformers are small in size and light in weight. They can penetrate into the load center to the maximum extent, shorten the radius of the low-voltage network and reduce losses. This type of transformer can be installed on a pole, which is easy to install and can reduce m

1 Basic principles and structure of on-load tap-changerAn on-load tap changer is an electrical device that can change the tap position under excitation. The basic principle of voltage regulation by on-load industrial electrical tap changers is to lead out several taps in the transformer winding and

Three-phase imbalance is an important indicator of power quality. Although there are many factors that affect the power system, normal imbalance is mostly due to asymmetry of three-phase components, line parameters or loads. Since the three-phase load factor is not certain, the three-phase voltage a