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In the medium-voltage power distribution system, the switchgear is the “control center” of the power supply link, and it is responsible for the control, protection and monitoring functions of the circuit. Among all kinds of switch cabinets, the drawout switchgear (also known as drawout switchgear) has been widely used due to its flexible maintenance and reliable operation. This article will systematically sort out the core knowledge of the ejector switch cabinet, and focus on the professional solutions of the leading power equipment enterprise Чуаньли.
A withdrawable switchgear is a type of switchgear in which the core functional components (such as circuit breakers, contactors, current transformers, etc.) are installed on a withdrawable car. Unlike fixed switch cabinets, these components can be smoothly pushed or pulled into or out of the cabinet along the guide rail, achieving independent operation and maintenance without affecting the operation of the entire power supply system.
The working principle of the removable switchgear is based on the flexible movement of the removable car and the reliable switching of the electric connection. It is mainly divided into three core states and the corresponding workflow:
Working position: The carrying function component is pushed into the cabinet and locked, and the main and auxiliary contacts are fully engaged to form a closed circuit. At this time, the switch cabinet normally conducts electricity and performs protective functions, such as the operation status of KYN28 series in industrial power distribution systems.
Test position: The hand car is returned to the position where the main contact is disconnected and the auxiliary contact is still connected, and the function test (such as relay protection commissioning) can be carried out without power in the main circuit to ensure maintenance safety.
Extract position: The hand car is completely pulled out of the cabinet, and the functional components are completely isolated from the electrical system of the cabinet. The components can be maintained, replaced, or repaired without stopping the entire power grid, greatly improving work efficiency.
Compared with fixed switch cabinets, drawout switch cabinets (including drawout switchgear) have significant advantages, which are fully reflected in Чуаньли products:
Easy maintenance: Components can be removed for maintenance without disconnecting the entire system, reducing downtime from several hours to several minutes and reducing production losses for enterprises.
Reliability of operation: Чуаньли switch cabinet adopts multi-level locking mechanism and silver-plated contacts, stable connection at working position, avoiding poor contact caused by vibration or external interference.
Flexibility: Modular switchgear can be quickly replaced to adapt to changes in load or functional requirements, extend the service life of the equipment, and reduce the cost of renovation.
High safety: The design of the test position and the mechanical interlocking function prevent misoperation (such as closing the circuit when the hand car is not in place), protecting the safety of maintenance personnel and equipment.
Space optimization: Compact structure integrates multiple functions in a single cabinet, saving the installation space of substations.
With flexible and reliable performance, the drawout switchgear is widely used in many fields, and the products of Чуаньли have been verified in a large number of practical projects:
Industrial enterprises: Distribution systems for manufacturing plants, steel mills, and petrochemical enterprises. These scenarios have high requirements for continuous production and need to minimize maintenance downtime. The KYN28-20 series is suitable for high-power industrial scenarios.
Commercial and public buildings: Used in shopping malls, hospitals, data centers to ensure reliable power supply for critical loads such as medical equipment and servers, and facilitate quick maintenance.
New energy system: Integrated into wind farms and photovoltaic power plants, controlling and protecting the grid connection circuit, the extractable components can adapt to the dynamic adjustment of new energy output.
Urban power distribution network: Used in medium-voltage substations and ring network cabinets, Чуаньли KYN28-1 2 series supports the efficient operation and maintenance of urban power grid.
The selection of suitable drawout switchgear should be based on practical needs and product characteristics, and reference should be made to the solution experience of Чуаньли:
Specify voltage and capacity: Match the rated voltage and current capacity of the switchgear with the grid parameters, and KYN28 series covers common medium voltage levels.
Evaluate maintenance requirements: For frequent inspection of components (such as data centers), choose models with smooth manual movement and quick locking.
Considering environmental conditions: High humidity and dusty environments (such as industrial workshops), choose products with a protection class of IP4X or higher – the environmental adaptability of the products of Чуаньли is excellent.
Verify the manufacturer’s strength: Choose manufacturers like Чуаньли with mature production technology and perfect after-sales service to ensure timely supply of spare parts and technical support.
Pay attention to safety certification: Ensure that the product complies with relevant standards such as IEC and GB, such as Чуаньли switch cabinets, which meet the national medium-voltage equipment safety specification.
Withdrawable switchgear, including drawout switchgear, has become the core equipment of modern medium-voltage power distribution system due to its advantages of convenient maintenance, reliable operation, and safe and efficient operation. Through years of technical accumulation, professional manufacturer Чуаньли continuously optimizes the performance of the extracted switch cabinet.
The KYN28-10 and KYN28-20 series integrate advanced technology and practical needs, providing reliable distribution solutions for various industries. Choosing the right type of panel распределительное устройство and cooperating with reliable manufacturers like Чуаньли is crucial for improving power supply stability and reducing operation and maintenance costs.
Q1: What is the difference between withdrawable and fixed switchgear?
A1: The detachable type has detachable carts, and the components can be maintained on-site without disconnecting the entire system; Fixed components are fixed in the cabinet, and maintenance requires a complete power outage.
Q2: How often should withdrawable switchgear be maintained?
A2: Every 6–12 months, Чуаньли products undergo routine inspections (contacts, locks, etc.); Major overhauls every 3–5 years, depending on the operating environment.
Q3: Can withdrawable switchgear be installed outdoors?
A3: Yes, it needs to be equipped with an outdoor cabinet. The customized model of Чуаньли has weather-resistant design, suitable for -30 ℃ to 50 ℃ and rainproof requirements.
Q4: What are the safety benefits of drawout switchgear?
A4: Mechanical interlocking to prevent misoperation; Avoid working with electricity in the test location; Extract the designed isolation components to ensure the safety of maintenance personnel.
Q5: How long does a withdrawable switchgear system typically last?
A5: The service life of Чуаньли switch cabinet is 15–20 years, and the hand car can be replaced to extend the effective use cycle of the system.
