Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

The self-cleaning mechanism of transformer oil is typically achieved through the following methods: Oil Purifier FiltrationOil purifiers are common purification devices in transformers, filled with adsorbents such as silica gel or activated alumina. During transformer operation, convection caused by oil temperature changes drives the oil to flow downward through the purifier. Moisture, acidic substances, and oxidation byproducts in the oil are absorbed by the adsorbent, thereby maintaining oil c

Grounding the secondary neutral of a control transformer is a complex topic involving multiple aspects such as electrical safety, system design, and maintenance.Reasons for Grounding the Secondary Neutral of a Control Transformer Safety considerations: Grounding provides a safe path for current to flow to earth in the event of a fault—such as insulation failure or overload—instead of passing through the human body or other conductive paths, thereby reducing the risk of electric shock. System sta

How to Implement Transformer Neutral Grounding Gap Protection Measures?In a certain power grid, when a single-phase ground fault occurs on a power supply line, both the transformer neutral grounding gap protection and the power supply line protection operate simultaneously, causing an outage of an otherwise healthy transformer. The main reason is that during a system single-phase ground fault, the zero-sequence overvoltage causes the transformer neutral grounding gap to break down. The resulting

1.Innovative Winding Structures for 10 kV-Class High-Voltage High-Frequency Transformers1.1 Zoned and Partially Potted Ventilated Structure Two U-shaped ferrite cores are mated to form a magnetic core unit, or further assembled into series/series-parallel core modules. Primary and secondary bobbins are mounted on the left and right straight legs of the core, respectively, with the core mating plane serving as the boundary layer. Windings of the same type are grouped on the same side. Litz wire i

How to Increase Transformer Capacity? What Needs to Be Replaced for Transformer Capacity Upgrade?Transformer capacity upgrade refers to improving the capacity of a transformer without replacing the entire unit, through certain methods. In applications requiring high current or high power output, transformer capacity upgrades are often necessary to meet demand. This article introduces methods for transformer capacity upgrade and the components that need to be replaced.A transformer is a critical

Causes of Transformer Differential Current and Hazards of Transformer Bias CurrentTransformer differential current is caused by factors such as incomplete symmetry of the magnetic circuit or insulation damage. Differential current occurs when the primary and secondary sides of the transformer are grounded or when the load is unbalanced.Firstly, transformer differential current leads to energy waste. Differential current causes additional power loss in the transformer, increasing the load on the

The windings and core of a transformer are the primary components responsible for transmitting and transforming electromagnetic energy. Ensuring their reliable operation is a major concern. Statistical data shows that core-related issues account for the third-highest cause of transformer failures. Manufacturers have paid increasing attention to core defects and have implemented technical improvements regarding reliable core grounding, core ground monitoring, and ensuring single-point grounding.

The main hazard points in transformer operation are: Switching overvoltages that may occur during the energizing or de-energizing of no-load transformers, endangering transformer insulation; No-load voltage rise in transformers, which may damage transformer insulation.1. Preventive Measures Against Switching Overvoltages During No-Load Transformer SwitchingGrounding the transformer neutral point is primarily aimed at preventing switching overvoltages. In 110 kV and higher large-current grounding

What is a Grounding Transformer?A grounding transformer, abbreviated as "grounding transformer," can be classified into oil-immersed and dry-type according to the filling medium; and into three-phase and single-phase grounding transformers according to the number of phases.Difference Between Grounding Transformers and Conventional TransformersThe purpose of a grounding transformer is to create an artificial neutral point for connecting an arc suppression coil or resistor when the system is conne

In power systems, transformers, as core equipment, are critical to the safe operation of the entire grid. However, due to various reasons, transformers are often exposed to multiple threats. In such cases, the importance of grounding resistor cabinets becomes evident, as they provide indispensable protection for transformers.Firstly, grounding resistor cabinets can effectively protect transformers from lightning strikes. The instantaneous high voltage caused by lightning can severely damage tran