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

1. What is a Recloser?A recloser is an automated high-voltage electrical switch. Similar to a circuit breaker in household electrical systems, it interrupts power when a fault—such as a short circuit—occurs. However, unlike a household circuit breaker that requires manual reset, a recloser automatically monitors the line and determines whether the fault has cleared. If the fault is temporary, the recloser will automatically reclose and restore power.Reclosers are widely used throughout distribut

Brand Core Business Tavrida Electric Specializes in reclosers and other transmission & distribution equipment, with a strong focus on the R&D and manufacturing of high-voltage switching devices. Its Tavrida OSM recloser stands out in the industry, delivering reliable distribution solutions for power systems. NOJA Power Focuses on intelligent reclosers and related distribution equipment. The company’s advanced NOJA OSM recloser technology targets smart grid applica

In order to actively respond to the development requirements of the power industry, our company has intensified its investigation into grid construction faults in a certain area and provided operation and maintenance support for DC UHV transmission and transformation projects in high-altitude regions by installing and optimizing UHV transmission equipment design schemes. The total land area of the construction site is 2,541.22 m², with a net land area of 2,539.22 m². The geological strata at the

As a critical carrier for power transmission, ultra-high-voltage (UHV) transmission lines place exceptional emphasis on the safety and efficiency of live-line operations. Facing extremely high voltage levels and complex working environments, maintenance technologies for live-line operations on UHV transmission lines have long encountered a series of challenges. Therefore, it is crucial to continuously strengthen research on maintenance technologies for live-line operations on UHV transmission li

Recently, China’s switchgear manufacturer independently developed the world’s first ±408 kV DC transfer switch, which has successfully passed the full set of type tests. This marks the official successful development of the product and represents the first breakthrough in DC transfer switches applied on the 400 kV pole line side.The Jinshang–Hubei UHV project is currently the world’s highest-altitude ±800 kV ultra-high-voltage (UHV) DC transmission project. It adopts China’s independently develo

1.Blocking Principle of Ultra-High-Voltage Converter Valves1.1 Working Principle of Converter ValvesUltra-high-voltage (UHV) converter valves typically employ thyristor valves or insulated-gate bipolar transistor (IGBT) valves to convert alternating current (AC) to direct current (DC) and vice versa. Taking the thyristor valve as an example, it consists of multiple thyristors connected in series and parallel. By controlling the triggering (turn-on) and turn-off of thyristors, the valve regulates

In a certain region, after maintenance of ultra-high-voltage (UHV) transmission lines, the following issues were identified: existing drones lack sufficient performance to meet the current large-scale and extensive inspection and maintenance demands of UHV lines. In practical operations, drones exhibit inadequate endurance, limited image acquisition capability, and poor electromagnetic interference (EMI) resistance, which negatively impacts inspection effectiveness and prevents accurate identifi

Currently, traditional-type breathers are widely used in transformers. The moisture-absorbing capability of silica gel is still judged by operation and maintenance personnel through visual observation of the color change of silica gel beads. Subjective judgment by personnel plays a decisive role. Although it has been clearly stipulated that silica gel in transformer breathers should be replaced when more than two-thirds of it changes color, there is still no accurate quantitative method to deter

High-voltage vacuum circuit breakers are widely used across China’s power industry—in urban and rural power grid upgrades, chemical plants, metallurgy, railway electrification, mining, and other sectors—thanks to their excellent arc-quenching characteristics, suitability for frequent operations, and long maintenance-free intervals. They have received widespread acclaim from users.The primary advantage of vacuum circuit breakers lies in the vacuum interrupter; however, a long maintenance-free int

Recently, Chinese GIS manufacturers announced exciting news: the first ZF11C-252(L) mixed-gas double-break GIS product developed by a Chinese GIS manufacturer successfully passed its on-site power frequency withstand voltage test on the first attempt at a project site. This achievement marks another milestone for Chinese GIS manufacturers in advancing green and high-quality development of power grids.The ZF11C-252(L) mixed-gas double-break GIS that passed the test represents the culmination of t