Encyclopedia

1. Overview of Surge Arrester Handover Test Technology1.1 Necessity of Handover TestThe handover test is a crucial step in ensuring the performance and safe operation of surge arresters within power systems. For power systems with voltage levels at 220 kV and below, surge arresters play a core role in protecting electrical equipment from damage caused by overvoltages and lightning strikes. However, during the process from the arrester leaving the factory to its actual operation after installatio

In daily operations, various equipment defects are inevitably encountered. Whether maintenance personnel, operation and maintenance staff, or specialized management personnel, all must understand the defect classification system and adopt appropriate measures according to different situations.According to Q/GDW 11024-2013 "Operation and Management Guide for Relay Protection and Safety Automatic Devices in Smart Substations," equipment defects are classified into three levels based on severity an

Grounding transformer is a special type of transformer primarily used for grounding protection in power systems. The design and winding connection methods of this transformer are crucial to ensuring the safe operation of power systems.1.Function of Grounding TransformerThe main function of a grounding transformer is to provide grounding protection in power systems. When a ground fault occurs in the system, the grounding transformer helps limit the fault current, thereby protecting equipment and

1. IntroductionA transformer operates based on the principle of electromagnetic induction. The main components of a transformer are the windings and the core. During operation, the windings serve as the path for electric current, while the core serves as the path for magnetic flux. When electrical energy is input to the primary winding, the alternating current creates an alternating magnetic field in the core (i.e., electrical energy is converted into magnetic field energy). Due to magnetic link

1. What is Secondary Equipment Grounding?Secondary equipment grounding refers to connecting the secondary equipment (such as relay protection and computer monitoring systems) in power plants and substations to the earth via dedicated conductors. Simply put, it establishes an equipotential bonding network, which is then connected to the station’s main grounding grid at multiple points.2. Why Does Secondary Equipment Require Grounding?Normal power-frequency currents and voltages during primary equ

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