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

Good news has come from a Chinese tank-type filter manufacturer: its independently developed 550 kV tank-type filter bank circuit breaker has successfully passed all type tests, marking the official completion of the product’s development.In recent years, with the continuous growth of electricity demand, power grids have placed increasingly higher performance demands on electrical equipment. Keeping pace with the times, the Chinese tank-type filter manufacturer has actively responded to the nati

1. Operating Principle of the DisconnectorThe operating mechanism of the disconnector is connected to the active pole of the disconnector via a connecting tube. When the main shaft of the mechanism rotates 90°, it drives the insulating pillar of the active pole to rotate 90°. The bevel gears inside the base drive the insulating pillar on the other side to rotate in the opposite direction, thereby achieving opening and closing operations. The active pole, through inter-pole linkage tubes, drives

Selection Guidelines for 36 kV Disconnect SwitchesWhen selecting the rated voltage, ensure that the disconnect switch’s rated voltage is equal to or higher than the nominal voltage of the power system at the installation point. For example, in a typical 36 kV power network, the disconnect switch must have a rated voltage of at least 36 kV.For rated current, selection should be based on the actual long-term load current. Generally, the switch’s rated current must be no less than the maximum conti

The relationship between the temperature-rise current of a 145 kV disconnector and copper conductor size lies in balancing current-carrying capacity and heat dissipation efficiency. The temperature-rise current refers to the maximum continuous current a conductor can carry without exceeding its specified temperature rise limit, and the copper conductor size directly influences this parameter.Understanding this relationship begins with the physical properties of the conductor material. Copper’s c

Many people have asked me: “What’s the difference between a recloser and a pole-mounted circuit breaker?” It’s hard to explain in one sentence, so I’ve written this article to clarify. In fact, reclosers and pole-mounted circuit breakers serve very similar purposes—they are both used for control, protection, and monitoring on outdoor overhead distribution lines. However, there are significant differences in the details. Let’s examine them one by one.1.Different MarketsThis may be the biggest dis

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

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