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With the rapid development of smart grids, industrial intelligence and new energy projects, traditional high-voltage distribution equipment with fixed structures struggles to meet modern flexible construction and upgrade demands. Adopting an assembled design и flexible combination, the advanced modular switchgear effectively solves the pain points of difficult expansion and cumbersome maintenance, becoming the mainstream choice for modern medium and high-voltage power distribution systems.
Modular high-voltage switchgear is a new generation of high-voltage distribution equipment that separates the entire cabinet into multiple independent, standardized, and interchangeable functional units in accordance with distribution logic and safety specifications. Each module corresponds to independent electrical functions such as input, output, transformer, metering, and protection control, completely breaking the limitations of traditional cabinet welding, structural fixation, and single-function.
Its core design concept is prefabricated design and flexible combination, abandoning the traditional integrated fixed structure, and supporting the free grouping and flexible arrangement of cabinet types such as input cabinet, output cabinet, PT cabinet, transformer cabinet, isolation cabinet, etc. The equipment has strong versatility, high expandability, and convenient modification, which perfectly adapts to the personalized construction and later expansion iteration needs of smart grid, industrial park, new energy power station and other projects, and solves the industry pain points of traditional high-voltage cabinet layout rigidity, high expansion cost, and difficult operation and maintenance.
The KYN28-24 modular high-voltage cabinet adopts the mainstream armored compartment structure in the industry. The entire cabinet is scientifically divided into four independent sealed compartments, namely, busbar room, circuit breaker room, cable room, and secondary control room. Each compartment is physically isolated by metal partitions, which can effectively block the spread of fault arcs and avoid interference between functional units, thereby improving the structural safety of equipment operation.
The equipment is equipped with VS1, VN2 series high-performance medium and high-voltage vacuum circuit breakers and solid-sealed vacuum switches, with excellent arc extinguishing performance and long mechanical life; The main busbar adopts a double insulation process of heat shrink insulation + epoxy coating, optimizes the electrode structure, and effectively reduces local discharge; The secondary circuit is equipped with high-precision control and protection elements, which can realize real-time monitoring, fault diagnosis and automatic protection. The overall cabinet has clear layers, compact structure, and high standardization, which lays a solid foundation for modular assembly and flexible combination.
| Modular Compartments | Core Configuration | Основные функции | Structural Advantages |
| Busbar Compartment | Epoxy-coated insulated busbars, heat-shrinkable insulated accessories | Centralized power reception, transmission, and energy diversion for the entire cabinet group | Fully insulated against leakage, low partial discharge |
| Circuit Breaker Compartment | VS1/VN2 vacuum circuit breakers, withdrawable trolley mechanism | Completes line opening and closing, fault isolation, and protection | Plug-in structure for convenient replacement and maintenance |
| Cable Compartment | Incoming and outgoing terminals, grounding switches, and current transformers | External cable connections, line grounding, and fault isolation | Ample wiring space, strong expandability |
| Secondary Control Compartment | Protective relays, monitoring elements, and control circuit devices | Signal acquisition, remote control, safety interlock protection | Independently sealed to resist interference, stable signal |
The core advantage of modular switchgear is standardized assembly design. All functional modules of KYN28-24 are produced according to the national standard and the IEC international standard, with high dimensional accuracy and strong interchangeability. Different from the traditional welding cabinet structure, which is fixed and cannot adapt to various working conditions, this series of equipment supports the free combination of various functional units according to the project power distribution scale, load level, and process requirements, and customizes the exclusive medium-voltage power distribution system scheme.
Relying on the characteristics of flexible combination, the load growth in the later stage of the project, the upgrading of the power grid, when the capacity is expanded, it is not necessary to replace the equipment as a whole. It is only necessary to add or replace a single functional module to complete the system upgrade, which greatly shortens the construction period, reduces the equipment investment and renovation cost, and significantly improves the flexibility, expandability and long-term use value of the distribution system.
The electrical parameters of the KYN28-24 modular high-voltage cabinet are comprehensive and excellent, fully meeting the operation specifications of the 24kV medium-voltage power grid. The rated current of the equipment covers the full specification of 630A-3150A, and is suitable for various load scenarios such as industrial power distribution, commercial power supply, and new energy grid connection. It can withstand 20kA, 31.5k A / 4s short-term short-circuit current; the peak withstand current can reach up to 80kA, with extremely strong short-circuit fault resistance.
In terms of insulation performance, the equipment has a withstand voltage of 125 kV between phases and 145 kV at the break point, with a maximum withstand voltage of 79 kV for lightning surges and transient overvoltage surges, which can effectively resist lightning surges and transient voltage surges in the power grid. The secondary control circuit can withstand 2000V AC voltage and has excellent anti-interference ability. The local discharge of the equipment is low, the electrical loss is small, the operation is stable under long-term full load and complex power grid conditions, without problems such as breakdown, flashover, and abnormal heat generation, and the reliability of the equipment is far beyond the industry standard.
| Core Electrical Performance Items | Industry Standard Parameters | Chuanli KYN28-24 Measured Performance | Performance Advantages |
| Номинальное напряжение | 24kV | 24kV All-condition Adaptability | Adaptable to 24kV Medium Voltage Power Grid Systems |
| Номинальный ток | 630A~3150A | Full Specification Coverage | Adaptable to Various Load Scenarios |
| 4s Short-Time Withstand Current | 20kA / 31.5kA | Stable Withstand, No Deformation or Damage | Strong Short-Circuit Impulse Resistance |
| Lightning Impulse Withstand Voltage | Phase-to-Phase 60kV / Break-Point 79kV | Compliant with Standards, No Flashover | Excellent Lightning Overvoltage Protection |
| 1min Power Frequency Withstand Voltage | Phase-to-Phase 125kV / Break-Point 145kV | No Breakdown, No Flashover | Sufficient Insulation Safety Redundancy |
| Уровень защиты | Indoor IP4X | IP4X Dustproof and Moisture-proof | High Indoor Operating Stability |
Safety protection is the core bottom line of the design of high-voltage cabinets. The KYN28-24 modular switchgear is equipped with a complete and perfect five-protection mechanical interlocking system, which prevents all high-risk errors in high-voltage operation from the hardware level: it is strictly forbidden to push and pull the hand car with a load. Do not allow the grounding switch to be closed when it is energized, do not allow the circuit breaker to be closed when the grounding switch is closed, do not allow energized grounding operations, and do not allow unauthorized access to energized sections. The multiple mechanical locking mechanisms have a rigorous logic and mandatory linkage, making it impossible for humans to violate the rules, and completely avoiding equipment failures and safety accidents caused by human error.
The cabinet adopts an armored all-closed metal structure, and the independent compartment isolation design can effectively block the arc, high-temperature gas and splashes produced by internal short circuit, protect the personal safety of operators, and prevent equipment burning and electrical fires. Combined with high-precision relay protection and intelligent monitoring devices, it realizes precise fault identification, rapid tripping, and real-time alarm, forming a double safety barrier of mechanical interlocking + electrical protection, and comprehensively improving the safety of the distribution system operation.
The traditional high-voltage cabinet is bulky, takes up a lot of space, and has high construction costs. The KYN28-24 modular integration optimizes the layout, and the cabinet size is divided into two specifications: 800×1,810×2,380mm and 1,000×1, 810×2.380mm. Compared with traditional equipment, it saves more than 30% of the space in the distribution room, significantly reduces the investment in civil infrastructure, and is suitable for urban narrow distribution rooms and compact layout scenarios.
The circuit breaker adopts a removable car structure, supporting plug-in and independent installation and maintenance. During daily inspection, equipment maintenance, and fault handling, the circuit breaker car can be operated separately without disassembling the entire cabinet. Single module inspection does not affect the normal power supply of other cabinets, and the power outage time is minimized, ensuring the continuity of power supply and greatly reducing the difficulty and cost of later operation and maintenance.
The KYN28-24 modular high-voltage cabinet is specially designed for complex indoor conditions and has excellent environmental adaptability. The operating temperature range of the equipment is -15 ℃ ~ + 40 ℃, which can be adapted to the seasonal temperature difference changes in most parts of China; It can run stably under the condition that the daily relative humidity is ≤95% and the monthly humidity is ≤90%, and it has good anti-moisture and anti-condensation ability;It is suitable for altitudes ≤1000 m and meets the standards of most urban and industrial power distribution scenarios.
The cabinet body adopts high-quality steel plate + electrostatic anti-corrosion spraying technology, which is dust-proof, anti-aging and corrosion-resistant. The internal insulating accessories are made of high weather-resistant materials, and the insulation performance will not degrade over a long period of operation. Under the premise of standardized installation and regular maintenance, the overall service life of the equipment can reach 20-30 years, the failure rate is extremely low, and it has high long-term operation stability and cost-effectiveness.
Compared with the traditional integrated high-voltage switchgear, the KYN28-24 modular switchgear of Чуаньли has the core advantages in all dimensions of design, construction, performance, and operation and maintenance: standardized assembly design realizes factory prefabrication production, small on-site assembly error, short construction cycle, and unified quality control; Modular units with flexible combinations can be customized as needed, eliminating redundant functions and resource waste; Excellent electrical tolerance ensures stable operation under power grid faults; A top-level security system is built with a full set of five-barrier interlocking and armored protection; Compact structure saves infrastructure construction costs, and plug-and-play modules greatly reduce operation and maintenance losses; Strong environmental adaptability can adapt to complex indoor conditions such as high humidity and dust in industrial environments, and is the high-cost-effective preferred equipment for high-voltage and medium-voltage distribution projects.
With its modular flexibility, high security, and high stability, the KYN28-24 high-voltage cabinet is widely used in various 24kV medium-voltage distribution core scenarios: urban and rural smart grid transformation and new construction projects, Industrial parks and large factories, industrial power distribution, photovoltaic and wind power new energy power stations, subway rail transit and municipal key infrastructure, data center and commercial complex power supply, residential district centralized power distribution, industrial and mining chemical indoor high voltage power distribution and other fields.、
Q1: What are the core advantages of modular high-voltage switchgear compared to traditional switchgear?
A1: It adopts a modular structure with flexible combination, strong versatility, easy expansion, smaller land occupation, simple operation and maintenance, higher safety level, longer service life, and can be adapted to the long-term iteration and upgrade of the project.
Q2: What voltage levels is the Chuanli KYN28-24 modular switchgear compatible with?
A2: Designed specifically for 24kV indoor medium-voltage distribution systems, it is fully compatible with all types of distribution conditions at this voltage level.
Q3: Does the KYN28-24 high-voltage switchgear have comprehensive safety protection functions?
A3: Yes, it is equipped with a complete set of five defense anti-mistake operation mechanical interlocking, armored anti-arc structure, and multi-layer electrical protection device, which realizes all-around safety protection.
Q4: Does the modular switchgear support future power system capacity expansion and upgrades?
A4: Support. Standardized modules can be added or replaced freely, without the need to replace the equipment as a whole, and the system can be expanded and upgraded at a low cost.
Q5: What are the operating environment requirements for the Chuanli KYN28-24 high-voltage switchgear?
A5: Suitable for indoor installation, operating temperature -15 ℃ ~ + 40 ℃, altitude ≤1000 m, average daily humidity of the environment ≤95%, no serious corrosion, flammable and explosive gas pollution on site.
Represented by the Chuanli KYN28-24 series, the high-performance modular switchgear features an innovative assembled design and flexible combination. It boasts stable electrical performance, full safety protection and strong environmental adaptability, perfectly adapting to smart grid, industrial and new energy project construction. It provides safe, efficient and upgradable equipment solutions for global high-voltage power distribution projects.
