Three point LC oscillator circuit

When a transformer is operating under no-load conditions, it often produces louder noise than under full load. The primary reason is that, with no load on the secondary winding, the primary voltage tends to be slightly higher than nominal. For example, while the rated voltage is typically 10 kV, the actual no-load voltage may reach around 10.5 kV.This elevated voltage increases the magnetic flux density (B) in the core. According to the formula:B = 45 × Et / S(where Et is the designed volts-per-

When installing an arc suppression coil, it is important to identify the conditions under which the coil should be taken out of service. The arc suppression coil should be disconnected under the following circumstances: When a transformer is being de-energized, the neutral-point disconnector must be opened first before performing any switching operations on the transformer. The energizing sequence is the reverse: the neutral-point disconnector should be closed only after the transformer is energ

Failures in power transformers are commonly caused by severe overload operation, short circuits due to winding insulation degradation, aging of transformer oil, excessive contact resistance at connections or tap changers, failure of high- or low-voltage fuses to operate during external short circuits, core damage, internal arcing in oil, and lightning strikes.Since transformers are filled with insulating oil, fires can have severe consequences—ranging from oil spraying and ignition to, in extrem

Transformer Longitudinal Differential Protection: Common Issues and SolutionsTransformer longitudinal differential protection is the most complex among all component differential protections. Misoperations occasionally occur during operation. According to 1997 statistics from the North China Power Grid for transformers rated 220 kV and above, there were 18 incorrect operations in total, of which 5 were due to longitudinal differential protection—accounting for approximately one-third. Causes of