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What is the difference between a dielectric and an insulator?
Using automation 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
08/30/2025
Fault Analysis and Treatment of Oil-Immersed Transformers
Using automation 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
08/29/2025
What losses occur during operation of the transformer? How to reduce losses?
Using automation 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 significantly with high
Rockwell
08/29/2025
Cable Fault Detection, Testing, Location and Repair
Using automation I. Methods for Cable Testing and Inspection:Insulation Resistance Test: Use an insulation resistance tester to measure the insulation resistance value of the cable. A high insulation resistance value indicates good insulation, while a low value may suggest insulation problems requiring further investigation.Voltage Withstand Test: Apply a high-voltage test using a high-voltage tester to verify whether the cable can withstand high voltage under its rated operating conditions. Under normal circums
08/29/2025
Cable Quality Inspection and Cable Detection & Testing
Using automation Power cable quality inspection and cable testing are conducted to ensure that the cable's quality and performance meet specified requirements, thereby guaranteeing the safe and stable operation of power systems. Below are some common contents of power cable quality inspection and cable testing:Visual Inspection: Check the cable surface for physical defects such as damage, deformation, or scratches to ensure the cable's exterior is intact.Dimensional Measurement: Measure dimensional parameters su
08/29/2025
Transformer Detection, Testing, Maintenance and Servicing
Using automation 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 insul
Vziman
08/29/2025
Detection, Testing and Comprehensive Monitoring of PV Grid-Connected Cabinets
Using automation 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
08/28/2025
Difference Between Short Circuit & Overload
Using automation 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
08/28/2025
Preventive Detection and Testing of Transformers
Using automation 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
Rockwell
08/28/2025
Fault Detection and Maintenance of Power Transformers
Using automation 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 requirements
08/28/2025
Maintenance, Servicing and Overhaul Key Points for Dry-Type Transformers in Electrical Equipment
Using automation 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 impair heat
Vziman
08/28/2025
Vulnerable Parts of Transformers and Their Replacement
Using automation The vulnerable components of a transformer and their replacement cycles must be determined comprehensively based on factors such as transformer type, operating environment, load conditions, and manufacturing processes.Common Vulnerable Components in Oil-Immersed TransformersOil-immersed transformers rely on insulating oil for heat dissipation and insulation. Their core components include the core, windings, insulation system, cooling system, and accessories. Vulnerable parts are primarily concen
08/28/2025
Methods for Reducing Arc Faults in Switchgear
Using automation An arc flash is one of the most destructive industrial incidents you might encounter. In an instant, your switchgear can be destroyed, downstream equipment severely damaged, operations shut down for days or weeks, and personnel seriously injured or killed.In certain facilities or applications, the potential risk of arc flash is very low; conventional (arc-flash unprotected) switchgear can be used with minimal risk. However, in most applications, it makes far more sense to rely on equipment incor
08/28/2025
Difference Between Transducer & Inverse Transducer
Using automation One of the primary differences between a transducer and an inverse transducer is that a transducer converts a non-electrical quantity into an electrical quantity, whereas an inverse transducer converts an electrical quantity into a non-electrical quantity. Other differences between the two are summarized in the comparison chart below.The control of physical quantities such as flow, rate, position, speed, temperature, and pressure depends on the accurate measurement of these quantities. In simple
08/28/2025
Let's Talk About Mining Transformers
Using automation Mine-Resistant Transformers, also known as Mining Transformers, are specialized electrical devices specifically designed for mining applications. These transformers are essential components in the mining industry, used to convert and distribute electrical power to various mining equipment and facilities. They are custom-engineered to meet the unique demands and challenges of mining environments.Key characteristics and features of mine-resistant transformers include:1. Durability: Mine-resistant
Vziman
08/28/2025
Application of Indoor Load Switches in Indoor Power Distribution Rooms
Using automation In indoor switchgear rooms, indoor load switches are key devices designed to meet the core requirements of "medium and low-voltage distribution, flexible control, and simplified protection." Their application centers on three primary scenarios: "circuit control, safety isolation, and fault coordination." The specific implementation methods and value are as follows:1.Power Control Unit for Terminal Loads: Load switches are commonly used in branch circuits of low-voltage distribution panels within
08/28/2025
What Tests Are Required for Indoor Load Switches?
Using automation The testing of indoor load switches should cover their entire lifecycle, focusing on four core aspects: "ensuring reliable insulation, normal mechanical operation, safe switching capability, and operational compatibility." The main testing categories include:1. Insulation Performance Testing: Use a megohmmeter to measure insulation resistance between phases, from phase to ground, and between moving and fixed contacts (≥0.5 MΩ for low voltage, ≥1000 MΩ for high voltage). High-vo
08/28/2025
What Should Be Noted During the Installation Process of Indoor Load Switches?
Using automation The installation quality of indoor load switches directly affects their operational safety and service life. It must be carried out focusing on four core principles: "safety protection, standardized wiring, mechanical compatibility, and insulation assurance." Specific precautions are as follows:1.Basic Preparation and Safety Protection Before Installation: Verify that the switch model and specifications (e.g., rated voltage, current) match the actual power distribution requirements to avoid "usi
08/27/2025
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