Type testing of medium voltage switchgear in accordance with IEC standards may involve two scenarios: First, testing at domestic accredited testing stations in compliance with the IEC 62271 series standards, resulting in test reports that conform to IEC 62271. Second, testing at international STL (Short-Circuit Testing Liaison) testing stations according to IEC standards and STL guidelines.

A 400V PV Low-Voltage Grid-Connection Cabinet is a critical interface device that connects the photovoltaic (PV) power generation system to the low-voltage grid. It is a dedicated distribution panel integrating protection, monitoring, metering, and control functions. It is primarily composed of the following core components:

This article introduces the application of wireless temperature monitoring systems in high-voltage and low-voltage switchgear. The configuration of the wireless temperature monitoring system varies across different equipment. If you need a customized wireless temperature monitoring solution for your project, please visit our website for more information.

This article introduces the configuration scheme for a switchgear arc flash protection system. Busbar arc flash protection monitors the busbar compartment and trips the incoming breaker, while feeder arc flash protection monitors the circuit breaker compartment and cable compartment to trip the feeder breaker. A proper arc flash protection system configuration scheme can effectively protect personnel and equipment safety. For information on a reliable arc flash protection system configuration scheme, please visit our website.

Arc Flash Protection is a specialized safety system engineered to rapidly detect and mitigate destructive electrical arc flash faults. Unlike conventional overcurrent protection, it utilizes a combination of light and current sensors to identify an arc flash event within milliseconds. By triggering a circuit breaker to isolate the fault incredibly fast, Arc Flash Protection significantly reduces the explosive energy released, safeguarding personnel from severe injury and preventing extensive damage to electrical equipment like switchgear. This makes it an indispensable defense layer in industrial, commercial, and utility power systems.

Switchgear requires the use of many fastening standard parts such as bolts, nuts, washers, and rivets. It is essential to select appropriate standard parts based on different applications to ensure functional requirements are met while enhancing product safety and cost-effectiveness.

Accelerated protection mechanisms in protection relays ensure quick response to faults, minimizing damage and enhancing system stability by understanding its role, function, and principle.

  Incoming Line Configuration: Marine switchgear systems are powered by multiple diesel generators operating in parallel. Each incoming line must be equipped with voltage transformers for accurate voltage measurement on the supply side.

   The typical service life of medium-voltage switchgear is approximately 20 years. After prolonged operation, various issues may arise, such as insulation aging, increased temperature rise, circuit breaker mechanism jamming, and loss of vacuum, all of which pose significant risks to continued operation. Replacing entire units requires substantial financial investment and time, whereas retrofitting offers a rapid solution to address safety hazards, revitalize the equipment, and ensure continued safe operation.

 Even for the same voltage level, different standards may require verification of both power frequency withstand voltage and lightning impulse withstand voltage. For instance, some regions like Southeast Asia and Australia require 11/12 kV switchgear with a power frequency withstand voltage of 28 kV but a lightning impulse withstand voltage of 95 kV. Standard domestic 12 kV switchgear cannot meet this requirement; enhanced insulation type, high-altitude type products, or using a higher-rated switchgear (e.g., 24 kV) to substitute for a lower one ("using a higher rating to cover a lower one") may be necessary.