Views: 0 Author: Rachel Publish Time: 2026-09-24 Origin: https://www.chsxdl.com
Stable and reliable medium‑voltage power distribution equipment is the core foundation of industrial production, power grid operation, new energy power generation and modern building power supply. As one of the most mainstream and mature indoor medium‑voltage switchgear in the global power industry, KYN28 switchgear (full name: KYN28 series armored removable AC metal‑enclosed switchgear) has always been the preferred solution for 3.6kV, 12kV and 24kV indoor power distribution systems. It is widely used in power plants, urban and rural substations, industrial and mining enterprises, petrochemical bases, commercial complexes and new energy power stations to complete power receiving, distribution, circuit control, fault protection and real‑time monitoring.
Different from traditional fixed switch cabinets, the KYN28 switch cabinet adopts an advanced withdrawable trolley structure. The internal vacuum circuit breaker is installed on a movable handcart, which can be pushed in and pulled out freely for isolation, test and maintenance. This innovative design greatly simplifies daily inspection and fault replacement work, avoids long‑term power outage caused by equipment maintenance, and significantly improves the operational efficiency and power supply continuity of the power system. In addition, the whole machine adopts metal fully enclosed armored structure, with strong anti‑interference ability, high safety coefficient and long service life, fully complying with IEC international electrical standards and GB national standards.
Our KYN28 series switchgear covers two mainstream specifications of KYN28‑12 (12kV) and KYN28‑24 (24kV). It supports single busbar and single busbar sectional power system operation, adapts to 50Hz/60Hz three‑phase AC power supply, and can meet the power distribution needs of conventional industrial projects, large‑scale engineering construction and high‑standard power grid upgrading projects. With compact structure, superior electrical performance and perfect safety interlock system, it has become the most cost‑effective indoor medium‑voltage switchgear in the global market.
KYN28 medium voltage switchgear is an indoor air‑insulated metal‑clad switchgear. It takes vacuum circuit breaker as the core control component, and realizes circuit switching, overload protection and short‑circuit protection through the cooperation of primary conductive components, secondary control components and mechanical interlock devices. The whole cabinet is scientifically divided into multiple independent sealed compartments, which fundamentally avoids mutual interference between functional areas and greatly reduces the risk of electric leakage, arc flash and short circuit faults.
The internal structure of KYN28 switch cabinet is divided into four core independent compartments, with clear functional division and high safety isolation performance:
This is the core working area of the switchgear, used to place the movable vacuum circuit breaker handcart. The handcart has three working states: test position, isolation position and working position. It can realize accurate docking and separation of the primary circuit and secondary control circuit. The compartment is equipped with pressure relief devices. Once internal arc fault occurs, the pressure can be released quickly to avoid cabinet deformation and personnel injury.
Located at the upper rear of the cabinet, it is used for installing main busbars and branch busbars, undertaking the power transmission and distribution work of the whole system. The busbar is made of high‑purity copper bar with silver‑plated anti‑oxidation treatment, which has low resistance and strong current‑carrying capacity. The closed isolation design effectively prevents external dust and foreign matters from entering, ensuring the stability of the main circuit.
Arranged at the lower part of the cabinet, it is used for connecting incoming and outgoing cables, installing current transformers, voltage transformers and grounding switches. The spacious internal space is convenient for cable wiring, later inspection and maintenance, and can adapt to multi‑loop cable layout requirements of different projects.
Located on the front upper side of the cabinet, it is used for installing protection relays, instrument meters, control switches and terminal rows. It realizes remote control, local operation, data monitoring and fault alarm functions of the switchgear, which is the intelligent control center of the whole equipment.
Safety is the biggest advantage of KYN28 series switchgear. The whole machine is equipped with a complete mechanical five‑prevention interlock device, which fundamentally eliminates human misoperation accidents in operation and maintenance. The five core interlock functions include: preventing mistaken closing and opening of circuit breaker, preventing load pushing and pulling of handcart, preventing live closing of grounding switch, preventing grounding switch closing and live line operation, and preventing accidental entry into live compartment. All interlock structures are mechanical forced locking, which is reliable and effective, and does not rely on manual operation awareness, fully meeting the safety operation specifications of medium and high voltage power systems.
Different from fixed switch cabinets that need power outage disassembly, KYN28 adopts a modular movable handcart structure. The vacuum circuit breaker handcart can be easily pushed into the working position or pulled out to the test and isolation position. In case of equipment failure or regular maintenance, only the handcart needs to be pulled out for inspection and replacement, without disassembling the whole cabinet. This design greatly shortens the maintenance time, reduces the power outage range, and improves the operation reliability of the power system. At the same time, the modular structure is convenient for later equipment upgrading and transformation, saving project renovation costs.
Equipped with high‑performance vacuum circuit breaker, the switchgear has strong arc extinguishing ability, fast breaking speed and high breaking capacity. It can effectively resist short‑circuit impact and overload current, and maintain stable operation under long‑term full‑load conditions. The internal insulating parts are made of high‑strength epoxy resin materials, with high dielectric strength, strong pollution resistance and creepage resistance, which can avoid flashover and leakage faults caused by indoor humidity and dust. The whole machine has passed strict power frequency withstand voltage and lightning impulse voltage tests, with stable performance and strong system adaptability.
KYN28 switch cabinet adopts optimized structural layout, with compact overall size and high space utilization rate. Compared with traditional old‑fashioned switch cabinets, it reduces the floor area on the premise of ensuring electrical safety distance, which can effectively save the construction space of power distribution room and reduce the overall engineering investment. The cabinet body is made of high‑quality cold‑rolled steel plate or aluminum‑zinc plated plate, with anti‑corrosion and anti‑rust treatment on the surface, firm structure and strong mechanical rigidity, not easy to deform and damage.
Each independent compartment of the switchgear is equipped with reliable isolation baffles and pressure relief channels. When internal short circuit and arc fault occur, the high‑temperature and high‑pressure gas generated by the electric arc can be quickly discharged through the top pressure relief device, which protects the cabinet body and on‑site equipment and personnel to the greatest extent. The fully closed metal structure can shield external electromagnetic interference, ensure the accurate operation of internal secondary instruments and protection devices, and improve the anti‑interference ability of the power system.
The front panel of the cabinet is equipped with intuitive display instruments, indicator lights and operation buttons, which is convenient for on‑site staff to observe the operating status of the equipment in real time. It supports local manual operation and remote intelligent control, and can be connected to the power system monitoring platform to realize real‑time data collection, fault alarm and remote scheduling. The handcart operation is smooth and labor‑saving, the locking and positioning are accurate, and the whole operation process is simple and efficient, reducing the operation difficulty of staff.
Our KYN28 series medium voltage switchgear covers full‑range specifications to meet different voltage level and project demands:
Model Series: KYN28‑12 (12kV), KYN28‑24 (24kV)
Rated Voltage: 3.6kV, 7.2kV, 12kV, 24kV
Rated Frequency: 50Hz / 60Hz
Rated Current: 630A, 1250A, 1600A, 2000A, 2500A, 3150A
Short‑Time Withstand Current: 20kA, 25kA, 31.5kA, 40kA
Insulation Mode: Air insulated (indoor use only)
Structure Type: Metal‑clad, withdrawable handcart type
Standard Compliance: IEC 62271, GB 3906 international and national standards
With high safety, stable performance and strong practicability, KYN28 indoor medium voltage switchgear is widely used in various medium and high voltage power distribution scenarios worldwide, and is the standard configuration of formal power engineering projects:
It is used for power receiving, power distribution and circuit protection in thermal power plants, wind power plants, photovoltaic central power stations and urban and rural power substations. It undertakes the core power scheduling work of the power system, ensuring stable power transmission and safe fault isolation of the power grid.
Suitable for medium‑voltage power distribution systems of factories, mines, metallurgy, chemical industry, building materials and other industrial enterprises. It can protect industrial transformers, high‑voltage motors and capacitor banks, and ensure the stable power supply of industrial production lines, avoiding production shutdown losses caused by power faults.
Widely used in high‑rise buildings, shopping malls, hospitals, schools, data centers and other large public buildings. It provides safe and reliable medium‑voltage power distribution guarantee for building power supply, fire protection power supply and intelligent power consumption systems.
Applied to power distribution projects of railways, highways, airports, urban rail transit and municipal power grid transformation. It adapts to high‑standard and high‑reliability power supply requirements of public infrastructure, realizing long‑term unattended stable operation.
Matched for large‑scale ground photovoltaic power stations, energy storage power stations and wind power supporting power distribution systems. It meets the frequent switching operation and intelligent scheduling requirements of new energy power generation systems, and adapts to the fluctuation characteristics of new energy power generation.
Q1: What is the difference between KYN28‑12 and KYN28‑24? The core difference lies in the rated working voltage. KYN28‑12 is suitable for 12kV and below medium voltage power systems, which is the most widely used conventional model; KYN28‑24 is upgraded for 24kV high‑grade medium voltage systems, with higher insulation level, larger safe creepage distance and stronger overvoltage resistance, suitable for high‑voltage distribution projects with higher power level requirements.
Q2: Can KYN28 switchgear be used outdoors? No. KYN28 series is an indoor air‑insulated switchgear, which is not waterproof, dustproof and weatherproof. It must be installed in a dry, ventilated and dust‑proof indoor power distribution room. For outdoor scenarios, outdoor high‑voltage box‑type switchgear or fully sealed outdoor isolator equipment is recommended.
Q3: What is the service life of KYN28 switch cabinet? Under standard indoor operating environment and regular maintenance, the overall service life of the equipment can reach 15‑20 years. The vacuum circuit breaker has a long mechanical life, with tens of thousands of stable opening and closing times, meeting the long‑term operation needs of power systems.
Q4: Do you support customized design? We support personalized customization of cabinet size, color, internal configuration, protection level and secondary control scheme. We can provide exclusive design solutions according to customer's on‑site power distribution room size, system parameters and project standard requirements.
Q5: What is your product warranty policy? We provide 3‑year full machine warranty and lifelong technical after‑sales service. During the warranty period, non‑human damaged parts can be replaced free of charge. We support global technical guidance, installation debugging guidance and remote fault diagnosis services.
In the medium voltage switchgear market, inferior products with thin cabinet materials, simple interlock structure and unqualified electrical performance often bring huge safety hidden dangers to engineering projects. We focus on the R&D and production of high‑standard KYN28 switchgear for many years, always adhering to power‑grade production standards, and strictly controlling every production process.
Strict Quality Control: All products are manufactured in accordance with IEC and GB international standards. Each batch of switchgear undergoes strict factory tests including insulation test, mechanical interlock test, short‑circuit withstand test and operation life test to ensure stable and qualified product performance.
Premium Material & Craftsmanship: The cabinet is made of high‑quality anti‑corrosion plate with firm overall structure; the internal conductive copper bar is thickened and silver‑plated for anti‑oxidation; the insulating parts are made of high‑purity raw materials with strong electrical resistance, effectively avoiding various electrical faults.
Complete Configuration & Strong Adaptability: We support full‑specification product matching, which can meet the needs of different voltage, current and system operation modes. Whether it is conventional industrial projects or high‑standard new energy and data center projects, we can provide matching switchgear solutions.
Factory Direct Sales & Cost‑Effective: Direct sales by manufacturer, no middlemen price difference. On the premise of ensuring high quality, we provide customers with competitive factory prices and support large‑scale project bulk procurement and customized services.
Professional After‑Sales System: We have a professional electrical technical team to provide one‑stop services including scheme design, product selection, factory production, on‑site installation guidance, debugging and after‑sales maintenance, ensuring zero worries for customers' project use.
As a mature, safe and reliable indoor medium voltage power distribution equipment, KYN28 series metal‑clad withdrawable switchgear has irreplaceable advantages in industrial power distribution, power grid operation and new energy projects. Its perfect five‑prevention interlock system, flexible withdrawable maintenance design, stable electrical performance and long service life make it the most mainstream medium voltage switchgear solution in the global market.
If you are looking for high‑quality, cost‑effective KYN28‑12/KYN28‑24 switchgear, or need customized medium voltage power distribution system solutions, please feel free to contact our team. We will provide professional product selection, parameter matching and exclusive project quotation services for you.
