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

Installation precautions for Type K thermocouples are critical to ensuring measurement accuracy and extending service life. Below is an introduction to the installation guidelines for Type K thermocouples, compiled from highly authoritative sources:1.Selection and Inspection Select the appropriate thermocouple type: Choose the right thermocouple based on the temperature range, medium properties, and required accuracy of the measurement environment. Type K thermocouples are suitable for temperatu

Causes of Fire and Explosion in Oil Circuit Breakers When the oil level in an oil circuit breaker is too low, the oil layer covering the contacts becomes too thin. Under the effect of the electric arc, the oil decomposes and releases flammable gases. These gases accumulate in the space beneath the top cover, mixing with air to form an explosive mixture, which can ignite or explode under high temperature. If the oil level inside the tank is too high, the released gases have limited space to expan

Error Tolerance of Total Harmonic Distortion (THD): A Comprehensive Analysis Based on Application Scenarios, Equipment Accuracy, and Industry StandardsThe acceptable error range for Total Harmonic Distortion (THD) must be evaluated based on specific application contexts, measurement equipment accuracy, and applicable industry standards. Below is a detailed analysis of key performance indicators in power systems, industrial equipment, and general measurement applications.1. Harmonic Error Standar

Solid insulation assistance combined with dry air insulation is a development direction for 24 kV ring main units. By balancing insulation performance and compactness, the use of solid auxiliary insulation allows passing insulation tests without significantly increasing phase-to-phase or phase-to-ground dimensions. Encapsulation of the pole can address the insulation of the vacuum interrupter and its connected conductors.For the 24 kV outgoing busbar, with the phase spacing maintained at 110 mm,

Ring main units (RMUs) are used in secondary power distribution, directly connecting to end-users such as residential communities, construction sites, commercial buildings, highways, etc.In a residential substation, the RMU introduces 12 kV medium voltage, which is then stepped down to 380 V low voltage through transformers. The low-voltage switchgear distributes electrical energy to various user units. For a 1250 kVA distribution transformer in a residential community, the medium-voltage ring m

In the field of electrical engineering, the stability and reliability of power systems are of paramount importance. With the advancement of power electronics technology, the widespread use of nonlinear loads has led to an increasingly serious problem of harmonic distortion in power systems.Definition of THDTotal Harmonic Distortion (THD) is defined as the ratio of the root mean square (RMS) value of all harmonic components to the RMS value of the fundamental component in a periodic signal. It is

When Actual Grid THD Exceeds Limits (e.g., Voltage THDv > 5%, Current THDi > 10%), It Causes Organic Damage to Equipment Across the Entire Power Chain — Transmission → Distribution → Generation → Control → Consumption. The Core Mechanisms Are Additional Losses, Resonant Overcurrent, Torque Fluctuations, and Sampling Distortion. Damage Mechanisms and Manifestations Vary Significantly by Equipment Type, as Detailed Below:1. Transmission Equipment: Overheating, Aging, and Drastically Reduced

Discharge Load for Energy Absorption: A Key Technology for Power System ControlDischarge load for energy absorption is a power system operation and control technology primarily used to address surplus electrical energy caused by load fluctuations, power source faults, or other disturbances in the grid. Its implementation involves the following key steps:1. Detection and ForecastingFirst, real-time monitoring of the power system is conducted to collect operational data, including load levels and

The Critical Role of Monitoring Accuracy in Power Quality Online DevicesThe measurement accuracy of online power quality monitoring devices is the core of the power system’s “perception capability,” directly determining the safety, economy, stability, and reliability of power supply to users. Inadequate accuracy leads to misjudgment, incorrect control, and flawed decision-making—potentially causing equipment damage, economic losses, or even grid failures. Conversely, high accuracy enables precis

Electric Power Dispatching in Modern Power SystemsThe power system is a critical infrastructure of modern society, providing essential electrical energy for industrial, commercial, and residential use. As the core of power system operation and management, electric power dispatching aims to meet electricity demand while ensuring grid stability and economic efficiency.1. Basic Principles of Electric Power DispatchingThe fundamental principle of power dispatching is to balance supply and demand by