I. IntroductionSubstations serve as critical hubs in power systems, responsible for transmitting electrical energy from power plants to end users. Busbars, as a key component of substations, play an essential role in power distribution and transmission. However, busbar voltage loss incidents occur from time to time, posing a serious threat to the safe and stable operation of power systems. Therefore, ensuring zero busbar voltage loss in substations has become a crucial issue in power system oper

Common Faults of High-Voltage Circuit Breakers and Mechanism Pressure LossCommon faults of high-voltage circuit breakers themselves include: failure to close, failure to trip, false closing, false tripping, three-phase asynchronism (contacts not closing or opening simultaneously), damage to the operating mechanism or pressure drop, oil spraying or explosion due to insufficient interrupting capacity, and phase-selective circuit breakers failing to operate according to the commanded phase."Circuit

High-voltage disconnectors are widely used in China’s power systems due to their convenient operation and strong practicality. However, during long-term operation, serious faults such as insulator fracture and failure to open/close still occur, significantly impacting the normal operation of power systems [1]. Based on this, this paper analyzes common faults of high-voltage disconnectors during operation and proposes corresponding solutions based on actual working conditions to improve managemen

1.Description of the Fault PhenomenonThe disconnector fault in a 550 kV GIS equipment occurred at 13:25 on August 15, 2024, while the equipment was operating under full load with a load current of 2500 A. At the moment of failure, the associated protection devices acted promptly, tripping the corresponding circuit breaker and isolating the faulty line. System operating parameters changed significantly: the line current dropped abruptly from 2500 A to 0 A, and the bus voltage instantly decreased

1.Analysis of the Structure and Working Principle of GN30 DisconnectorThe GN30 disconnector is a high-voltage switching device primarily used in indoor power systems to open and close circuits under voltage but no-load conditions. It is suitable for power systems with a rated voltage of 12 kV and AC frequency of 50 Hz or lower. The GN30 disconnector can be used either in conjunction with high-voltage switchgear or as a standalone unit. Featuring a compact structure, simple operation, and high re

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

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

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

The 145 kV disconnector is a critical switching device in substation electrical systems. It is used in conjunction with high-voltage circuit breakers and plays an important role in power grid operation:First, it isolates the power source, separating equipment under maintenance from the power system to ensure personnel and equipment safety;Second, it enables switching operations to change the system operating mode;Third, it is used to interrupt small-current circuits and bypass (loop) currents.Re

1. Function of Transformer Temperature ControllersToday, power transformers are primarily categorized into two types: oil-immersed and dry-type transformers. Dry-type transformers are widely used in power plants, substations, airports, railways, intelligent buildings, and smart residential communities due to their numerous advantages—such as inherent safety, flame resistance, zero pollution, maintenance-free operation, low losses, minimal partial discharge, and long service life.A key advantage