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

In power systems, high-voltage disconnectors in substations have suffered from aging infrastructure, severe corrosion, increasing defects, and insufficient current-carrying capacity of the main conductive circuit, significantly compromising power supply reliability. There is an urgent need to carry out technical retrofits on these long-in-service disconnectors. During such retrofits, to avoid interrupting customer power supply, the common practice is to place only the retrofit bay under maintena

High-voltage disconnectors are extremely widely used, and therefore people pay great attention to potential problems that may arise with them. Among various faults, corrosion of high-voltage disconnectors is a major concern. In light of this situation, this article analyzes the composition of high-voltage disconnectors, types of corrosion, and faults caused by corrosion. It also investigates the causes of disconnector corrosion and studies theoretical foundations and practical techniques for cor

High-voltage disconnectors, also known as isolator switches or knife switches, feature a simple working principle and convenient operation. As commonly used high-voltage switching equipment, they significantly impact the operational safety of substations, demanding stringent reliability in practical applications. The remote online defect-elimination system for high-voltage disconnector contacts offers advantages such as ease of operation, low operating costs, and high stability, making it well-s

Traditional switches have become increasingly inadequate for the operational demands of modern traction power supply systems. The emergence of high-voltage disconnectors has effectively filled this gap. High-voltage disconnector systems optimize the structure of conventional switches, broaden their applicability, and place greater emphasis on fine details, thereby enhancing the safety and reliability of power systems during actual operation. Therefore, it is essential to analyze and study the ap

According to relevant regulations, high-voltage disconnectors are permitted to perform the following operations: Switching (opening/closing) normally operating potential transformers (PTs) and surge arresters; Switching the neutral grounding disconnector of a main transformer under normal operating conditions; Switching small-current loops to balance circulating currents.A high-voltage disconnector is an electrical component without arc-quenching capability. Therefore, it may only be operated wh

In the context of high-speed operation of power systems, the opening and closing mechanism of high-voltage disconnectors in substations faces challenges such as complex operational procedures, large workloads, and low operational efficiency. With the advancement of image recognition technologies and sensor innovations, modern intelligent substations now demand higher technical standards for monitoring the open/close positions of high-voltage disconnectors during infrastructure development.The in

The operational status of high-voltage disconnectors directly impacts the safety and stability of power grids. Currently, the operation and maintenance (O&M) of high-voltage disconnectors face numerous challenges—traditional O&M methods are inefficient, slow to respond, and struggle to accurately predict faults. Against this backdrop, developing a remote monitoring and fault early-warning system for high-voltage disconnectors is of great significance.1. Overall Design of the Remote Monit

35kV Outdoor Wind-Resistant High-Voltage Disconnector— Suitable for wind farms, overhead line pole-mounted applications, and substation installations.Model series: GW5-40.5 outdoor high-voltage disconnector (hereinafter referred to as “disconnector”).This disconnector is designed for use in 50Hz, 35kV power systems to open or close circuits under no-load voltage conditions. The pollution-resistant variant meets the requirements of users in heavily polluted areas and effectively mitigates polluti

This failure mode has three primary origins: Electrical Causes: The switching of currents, such as loop currents, can lead to localized wear. At higher currents, an electric arc may burn at a specific spot, increasing the local resistance. As more switching operations occur, the contact surface wears down further, causing an increase in resistance. Mechanical Causes: Vibrations, often due to wind, are the main contributors to mechanical aging. These vibrations cause abrasion over time, leading t

High Voltage Air-Break Disconnectors and Earthing Switches: Function, Types, and Routine TestingFunction of High Voltage Air-Break DisconnectorsHigh voltage air-break disconnectors play a critical role in high voltage power systems by providing electrical and visible isolation between different parts of the system. This isolation is essential for both normal day-to-day operations and maintenance or repair activities. The two primary forms of isolation are: Isolation for Normal Operation:During n