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

A Brief Discussion on the Selection of Grounding Transformers in Boost StationsThe grounding transformer, commonly referred to as "grounding transformer," operates under the condition of being no-load during normal grid operation and overloaded during short-circuit faults. According to the difference in filling medium, common types can be divided into oil-immersed and dry-type; according to phase number, they can be classified into three-phase and single-phase grounding transformers. The groundi

1. Structure Forms and Classification of BushingsThe structure forms and classification of bushings are shown in the table below: Serial No. Classification Feature Category 1 Main insulation structure Capacitive Type Resin-impregnated paperOil-impregnated paper Non-capacitive Type Gas insulationLiquid insulationCasting resinComposite insulation 2 External Insulation Material PorcelainSilicone Rubber 3 Filling Material Between Capacitor Core and Exte

1.Neutral Point Establishment and System StabilityIn photovoltaic power stations, grounding transformers effectively establish a system neutral point. According to relevant power regulations, this neutral point ensures the system maintains certain stability during asymmetric faults, functioning like a "stabilizer" for the entire power system.2.Overvoltage Limitation CapabilityFor photovoltaic power stations, grounding transformers can effectively limit overvoltages. Generally, they can control o

H61 Distribution Transformer Selection includes the selection of transformer capacity, model type, and installation location.1.Selection of H61 Distribution Transformer CapacityThe capacity of H61 distribution transformers should be selected based on the current conditions and development trends of the area. If the capacity is too large, it results in the “large horse pulling a small cart” phenomenon—low transformer utilization and increased no-load losses. If the capacity is too small, the tran

Grounding transformers, commonly referred to as "grounding transformers" or simply "grounding units," operate under no-load conditions during normal grid operation and experience overload during short-circuit faults. Based on the filling medium, they are commonly categorized into oil-immersed and dry-type types; based on phase count, they can be either three-phase or single-phase grounding transformers.A grounding transformer artificially creates a neutral point for connecting a grounding resist

In the field of power equipment, three-phase voltage stabilizers play a crucial role in protecting electrical devices from damage caused by voltage fluctuations. Selecting the right three-phase voltage stabilizer is essential to ensure stable operation of equipment. So, how should one choose a three-phase voltage stabilizer? The following factors should be considered: Load RequirementsWhen selecting a three-phase voltage stabilizer, it is essential to clearly understand the total power demand of

In solid-state transformers (SSTs), the DC-link capacitor is an indispensable key component. Its primary functions are to provide stable voltage support for the DC link, absorb high-frequency ripple currents, and serve as an energy buffer. Its design principles and lifetime management directly impact the overall system efficiency and reliability. Aspect Core Considerations and Key Technologies Role and Necessity Stabilize DC link voltage, suppress voltage fluctuations, and provide

IEEE Std C37.20.9™ defines the design, testing, and installation requirements for metal-enclosed gas-insulated switchgear (MEGIS) using gas at pressures above ambient as the primary insulation medium for alternating current systems rated from 1 kV to 52 kV. This includes, but is not limited to, circuit breakers, switches, bushings, busbars, instrument transformers, cable terminations, meters, and control/protection relays. In these switchgear assemblies, vertical compartments—some or all of the

How to Select Low-Voltage Electrical Apparatus: Two Key Principles and Four Important ConsiderationsWhen selecting low-voltage electrical devices, two fundamental principles must be followed: safety and economy. Additionally, there are several critical factors to consider. Those unfamiliar with the process should refer to the guidelines below.I. Two Core Principles for Selecting Low-Voltage Electrical Apparatus Safety PrincipleThe selected low-voltage devices must operate accurately and reliably

The selection principles and precautions for fuse-switch disconnectors are crucial to ensuring the safe and stable operation of power systems.Selection Principles for Fuse-Switch Disconnectors Rated Voltage:The rated voltage of the fuse-switch disconnector shall be equal to or greater than the rated voltage of the electrical system to ensure the equipment operates normally without damage. Rated Current:The selection of rated current should be based on the load conditions of the electrical system