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

Meter reading, verification, and billing are critical operations for power companies, and their efficiency directly impacts the company's sustainable development. In recent years, with the widespread adoption of intelligent technologies, smart meters have been promoted and applied in power companies, driving transformation in meter reading and billing operations. The integrated application of smart meters and meter reading, verification, and billing information systems has become a key developme

Dielectrics and insulators are distinguished primarily by their applications. One of the main differences is that a dielectric can store electrical energy by becoming polarized in an electric field, whereas an insulator resists the flow of electrons to prevent current conduction. Other key differences between them are outlined in the comparison chart below.Definition of DielectricA dielectric material is a type of insulator that contains few or no free electrons. When subjected to an electric fi

Oil Leakage at Welded JointsOil leakage at welded joints primarily stems from poor welding quality, such as incomplete or detached welds, and defects like pinholes and gas pores. Although oil-immersed transformers are initially coated with solder and paint during manufacturing, potentially masking these issues temporarily, the defects tend to surface during operation. Additionally, electromagnetic vibration can cause weld cracks, leading to oil leakage.To resolve such leaks, the first critical s

Transformers experience various types of losses during operation, primarily categorized into two main types: copper losses and iron losses.Copper LossesCopper losses, also known as I²R losses, are caused by the electrical resistance of the transformer windings—typically made of copper. As current flows through the windings, energy is dissipated in the form of heat. These losses are proportional to the square of the load current (I²R), meaning they increase significant

Transformer testing, inspection, and maintenance are essential tasks to ensure normal operation and extend the service life of transformers. Below are some recommended steps: Visual Inspection: Regularly inspect the transformer's exterior, including the enclosure, cooling system, and oil tank. Ensure the enclosure is intact, free from corrosion, damage, or leakage. Insulation Resistance Testing: Use an insulation resistance tester to check the transformer's insulation system. Verify that the ins

Photovoltaic (PV) Grid-Connection CabinetA photovoltaic (PV) grid-connection cabinet, also known as a PV grid-connection box or PV AC interface cabinet, is an electrical device used in solar photovoltaic power generation systems. It is primarily responsible for converting the direct current (DC) electricity generated by a PV system into alternating current (AC) and connecting it to the utility grid.Main Components of a PV Grid-Connection Cabinet: DC Input Terminals: Receive DC power generated by

One of the main differences between a short circuit and an overload is that a short circuit occurs due to a fault between conductors (line-to-line) or between a conductor and earth (line-to-ground), whereas an overload refers to a situation where equipment draws more current than its rated capacity from the power supply.Other key differences between the two are explained in the comparison chart below.The term "overload" typically refers to a condition in a circuit or connected device. A circuit

I. DC Resistance Test of Transformer Primary and Secondary Windings:The DC resistance of transformer primary and secondary windings can be measured using the four-wire (Kelvin) method, which is based on principles related to accurate resistance measurement.In the four-wire method, two test leads are connected to both ends of the winding under test, while the other two leads are connected to adjacent winding terminals. An AC power source is then applied to the two leads connected to the adjacent

Power transformer fault detection and repair typically require operation by experienced and qualified technical personnel. Below are some common steps for power transformer fault detection and maintenance:I. Check the transformer’s input and output voltage, current, temperature, and other parameters to ensure they are within normal ranges. Carefully read the transformer’s instruction manual to understand its rated voltage and current, temperature limits, and other special req

I. Key Points for Daily MaintenanceVisual InspectionVisual inspection is the first step during routine patrols. Carefully examine the transformer’s enclosure for any damage or deformation. Enclosure damage not only compromises the transformer’s protective performance but may also expose internal electrical components, increasing safety risks. Additionally, check for dust accumulation, oil stains, or other contaminants on the transformer’s surface. Excessive dust can