Electrical Engineering Guides

Solid-State Transformers

Why Solid-State Transformers (SST) Rely Heavily on SiC/GaN Wide-Bandgap Devices？

The Bottleneck of Traditional Silicon-Based Devices The core operating principle of a Solid-State Transformer (SST) is to elevate the traditional power-frequency (50/60 Hz) conversion to medium/high frequency (tens to hundreds of kHz), thereby drastically shrinking the magnetic core volume. Tradit

By RW Energy 08/27, 2026
Oil-immersed Transformer

Oil-Immersed Transformer Oil Filtration: Pressure Filtration VS Vacuum Filtration

Conclusion First: Pressure filtration is suitable for scenarios where "the oil is essentially qualified and only requires particle removal, circulation purification, or oil transfer." Vacuum filtration is suitable for scenarios where "the oil is contaminated with moisture, contains gases, has expe

By Rockwill 08/18, 2026
Transformer

How to reduce transformer noise from the tank perspective?

Transformer noise is primarily generated by core magnetostriction (no-load noise) and winding electrodynamic forces (load noise). These vibrations are transmitted through the insulating oil and solid structural connections to the tank, causing the tank walls to undergo forced vibration and radiate a

By Rockwill 08/15, 2026
Surge Arresters

How Electricity Travels to Your Home: The Invisible Heroes of the Power Grid

Hello. As a sp ecialist in p ower systems, I am pleased to translate the previous technical analysis into English for you. This "Journey of Electricity" from the power plant to your household is a sophisticated engineering feat governed by the laws of physics and rigorous safety standards. The Odys

By Rockwill 08/14, 2026
Transformer

Transformer Oil Replacement: Key Considerations

Replacing the oil in a power transformer is a critical maintenance task. Improper execution can lead to reduced insulation performance, trapped air bubbles, or internal contamination, which may result in serious safety incidents. The entire process must strictly comply with electrical equipment oper

By Vziman 08/14, 2026
Transformer

H61 Transformer: Why Is It Often Equipped with a Delta Lightning Arrester?

The H61 transformer, a pole-mounted distribution transformer originally designed to French EDF standards and widely used across Europe and French-speaking African countries, is often equipped with what is referred to as a "delta lightning arrester." This term does not describe the physical shape of

By Vziman 08/12, 2026
Transformer

Transformer Oil Dielectric Loss (tanδ) Rise: Causes and Reasons

An increase in the dielectric loss factor (tan ) of transformer oil (insulating oil) typically indicates a decline in its insulating performance. Elevated dielectric loss generates additional heat during transformer operation, which accelerates insulation aging and may even lead to insulation breakd

By Vziman 08/11, 2026
Transformer

Transformer windings: why transposed conductors?

The core reason is to eliminate circulating currents between parallel conductors, thereby reducing additional losses and lowering temperature rise. Root cause: Unequal leakage flux linkage In transformer windings, the leakage magnetic field is non-uniformly distributed in both radial and axial direc

By Rockwill 08/10, 2026
Transformer

In naturally oil‑circulated transformer coils, why use guide plates (oil flow deflectors) for cooling?

In naturally oil-circulated transformers (ONAN/ONAF, etc.), guide plates (also called oil baffles) are widely installed in the windings as a cooling structure primarily to address the issue of oil flow short-circuiting inside the transformer. They force the cooling oil to flow through the horizontal

By Vziman 08/10, 2026
Power Transformers

Power Transformers: Effects of Repeated No-Load Switching

When an unloaded transformer is energized, it generates an inrush current. Repeated switching operations cause cumulative damage across several dimensions. The Nature of Inrush Current At the moment of energization, the core flux jumps from zero and superimposed on residual magnetism can reach 2 2.5

By Vziman 08/08, 2026
H61 Distribution Transformers

H61 Distribution Transformers: Advantages of the Side-Outlet Low-Voltage Bushing Configuration

The side-outlet low-voltage bushing arrangement where the low-voltage terminals are positioned on the side of the transformer tank rather than on the top is a common design choice for S-series and H61 distribution transformers in China. Its primary advantages are as follows: 1. Ease of Installation

By Rockwill 08/07, 2026
Dry-Type Transformers

Dry-type epoxy resin transformers vs. oil-immersed: why the higher average temperature rise?

The higher average temperature rise in dry-type epoxy resin transformers stems from fundamental differences in the cooling media and heat dissipation methods they rely on compared to oil-immersed transformers. Simply put, air is far less efficient at carrying away heat than transformer oil. Specific

By Vziman 08/04, 2026

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

All

Why Solid-State Transformers (SST) Rely Heavily on SiC/GaN Wide-Bandgap Devices？

Oil-Immersed Transformer Oil Filtration: Pressure Filtration VS Vacuum Filtration

How to reduce transformer noise from the tank perspective?

How Electricity Travels to Your Home: The Invisible Heroes of the Power Grid

Transformer Oil Replacement: Key Considerations

H61 Transformer: Why Is It Often Equipped with a Delta Lightning Arrester?

Transformer Oil Dielectric Loss (tanδ) Rise: Causes and Reasons

Transformer windings: why transposed conductors?

In naturally oil‑circulated transformer coils, why use guide plates (oil flow deflectors) for cooling?

Power Transformers: Effects of Repeated No-Load Switching

H61 Distribution Transformers: Advantages of the Side-Outlet Low-Voltage Bushing Configuration

Dry-type epoxy resin transformers vs. oil-immersed: why the higher average temperature rise?

Recommended Topics