The KYN28-24 AC Metal-Enclosed Switchgear is a specially developed armored withdrawable metal-enclosed switchgear by Junray Electrical for the 20kV power grid. It overcomes the limitation of traditional 12kV medium-mounted cabinets that cannot be adapted to the 20kV voltage system. With a rated voltage of 24kV as the core parameter, it builds a professional and reliable indoor three-phase AC 50Hz power distribution solution. The equipment adopts a medium-mounted handcart structure, and the cabinet body is precisely processed from aluminized zinc steel plates. The overall structure is divided into four independent compartments: busbar chamber, circuit breaker chamber, cable chamber, and instrument chamber. Each area is physically isolated, ensuring the stability of high-voltage operation from the structural perspective. As a dedicated power distribution equipment for the 20kV power grid, its design and manufacturing fully comply with the strict standards of high-voltage power distribution scenarios. From insulation configuration, protection performance to safety interlocks, all are customized according to the requirements of the 20kV system, making it the standard power distribution equipment for 20kV substations and large industrial projects.
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Rated Voltage |
AC 24KV |
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Rated Frequency |
50Hz |
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Rated Current |
630A~4000A |
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Rated Short-time Withstand Current |
31.5kA/40kA/50KA |
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Protection Class |
IP5X Structure |
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Center-Mounted Draw-out Structure Installation Method |
Floor-standing |
The equipment has a rated voltage of AC 24kV, which can stably handle the high-voltage transmission demand of a 20kV power grid. Compared to the conventional 12kV middle-mounted cabinet, the voltage level has been doubled, completely solving the core problem that ordinary equipment cannot adapt to the 20kV power grid, and meeting the requirements for power distribution and control in high-voltage scenarios. Combined with the 24kV dedicated insulation components and thickened copper busbars, the insulation performance and current-carrying capacity are upgraded simultaneously, ensuring the long-term safe operation of the high-voltage circuit.
The cabinet of KYN28-24 AC Metal-Enclosed Switchgear has a protection level of IP5X, which is superior to the IP4X standard commonly adopted by 12kV middle-mounted cabinets. It can fully block dust intrusion and resist environmental moisture erosion. The fully sealed cabinet structure combined with dedicated sealing components can still protect the internal high-voltage components from external interference in high-humidity, dusty industrial environments, outdoor substations, etc., maintaining stable insulation and conductivity performance, and extending the equipment's service life.
The rated short-time withstand current covers three levels: 31.5kA, 40kA, and 50kA. It can withstand the highest 50kA short-circuit current impact, far exceeding the tolerance standards of ordinary 12kV equipment. When a power grid has a short-circuit fault, it can quickly bear the instantaneous large current, avoiding cabinet deformation, insulation breakdown, and other problems, ensuring the integrity of the equipment during power grid faults, and providing reliable support for power system protection.
It is equipped with mechanical and electrical dual interlocks to achieve five preventive functions: preventing the pulling of the handcart with load, preventing incorrect tripping and closing of the circuit breaker, preventing the closing of the grounding switch with power, preventing entering the live compartments with power, and preventing closing the circuit breaker when the grounding switch is closed. This eliminates the risk of incorrect operation from the root and ensures the safety of maintenance personnel. The middle-mounted handcart can be independently withdrawn, and single-circuit maintenance does not require the entire system to be shut down, enabling non-stop maintenance and suitable for scenarios with extremely high requirements for power continuity.
As the core incoming and outgoing lines and metering equipment of a 20kV power grid substation, it undertakes the tasks of receiving, distributing and controlling high-voltage electrical energy, meeting the stable power distribution requirements of the high-voltage side of the substation.
Suitable for the 20kV main power distribution system of large industrial parks, providing high-voltage power support for multiple factories and workshops within the park, ensuring continuous power supply and safe control for industrial production.
Power distribution for super-large data centers
The KYN28-24 AC Metal-Enclosed Switchgear can be applied to the 20kV high-voltage power distribution of super-large IDC data centers， meeting the uninterrupted power supply requirements of data centers， and providing reliable high-voltage power for core loads such as server clusters and cooling systems.
Serving 20kV power distribution projects for large infrastructure projects such as airports， high-speed rail hubs， and large venues， it is suitable for the high-voltage power demands during the construction and operation phases of the projects, ensuring the stable operation of the power system.
Providing 20kV-level power distribution solutions for factories with high-voltage requirements such as steel， chemical， and electronic manufacturing， meeting the power supply and protection requirements for large production equipment and high-voltage motors.
Junray Electrical is a professional Factory and Supplier of KYN28-24 AC Metal-Enclosed Switchgear in China. We have been deeply engaged in the research and manufacturing of high-voltage power distribution equipment for many years and possess a complete product research, production, and quality inspection system. The KYN28-24 product follows international and domestic standards such as IEC298 and GB3906 throughout its design and production process. Core components are selected from high-quality brands in the industry. Each device undergoes strict tests such as withstand voltage, insulation, and interlock before leaving the factory to ensure performance compliance. We have a professional technical team that can provide customized solutions based on the actual needs of the customer's 20kV power grid. At the same time, we offer a full-cycle service covering installation and commissioning, operation and maintenance training, and after-sales repair.
1. Can KYN28-24 directly replace the 12kV medium-mounted switchgear?
The rated voltage of KYN28-24 is 24kV, specifically designed for a 20kV power grid. Its insulation parameters and cabinet structure are all suitable for high voltage levels. The 12kV medium-mounted switchgear is only applicable to power grids of 12kV or below. The voltage levels do not match and they cannot be used interchangeably.
2. What specific environmental conditions can the KYN28-24 AC Metal-Enclosed Switchgear with IP5X protection level withstand?
The IP5X protection can completely prevent dust from entering, and also resist low-pressure water jets from all directions. It is suitable for high-humidity, dusty industrial workshops, outdoor substations, underground distribution rooms, etc., and no additional protective facilities are required.
3. What are the advantages of the in-between type handcart structure for maintenance?
The handcart can be withdrawn independently. In case of a single circuit failure, only the corresponding handcart needs to be withdrawn for maintenance, while the other circuits continue to operate. This enables maintenance without power outage, significantly reducing the downtime and is suitable for scenarios such as hospitals, data centers, and rail transit where power outages are not allowed.
4. What is the rated current range that this product can accommodate?
The rated current of the equipment covers 630A to 4000A. You can choose the corresponding current specification according to the customer's load requirements, meeting the different current demands ranging from small power distribution to large industrial projects.
This project involves the construction of a new 20kV high-voltage power distribution system for a large-scale industrial production base specializing in new materials. The facility houses heavy-duty production lines featuring large-scale crushing, grinding, and drying equipment driven by variable-frequency drives (VFDs), creating high-load and shock-load operating conditions. The regional grid utilizes a 20kV distribution standard (distinct from the conventional 10kV); equipment originally planned for the 12kV class lacked sufficient voltage withstand capability and insulation margins, failing to meet requirements for system overvoltage protection and safe operation.
To accommodate the 20kV voltage level, enhance system insulation, and withstand industrial dust and overvoltage conditions, the project utilizes KYN28-24 metal-clad, withdrawable high-voltage switchgear throughout the substation. These units serve as the core equipment for main incoming lines, bus-tie connections, power feeders, and transformer protection, ensuring continuous heavy-duty production across the facility.
Voltage Level Mismatch: The regional grid operates at 20kV; standard KYN28-12 cabinets lack the necessary voltage withstand rating, posing risks of dielectric breakdown and flashover, and are therefore strictly unsuitable.
Frequent Industrial Overvoltage: Frequent starting/stopping of large motors and switching of VFDs generate high operational overvoltages, demanding exceptional insulation margins.
Harsh Site Environment: High dust levels in production workshops and significant diurnal temperature fluctuations make standard cabinets prone to dust accumulation, surface tracking, and accelerated insulation aging.
High Reliability Requirements: Production lines operate continuously (24/7) without allowing for widespread power outages; a withdrawable design is essential for rapid maintenance and component replacement.
High Precision in Relay Protection: Heavy-duty equipment imposes strict requirements on short-circuit protection, overload protection, and the sensitivity of instantaneous trip operations.
In accordance with 20kV grid standards and heavy-duty industrial operating conditions, the high-voltage distribution room is uniformly equipped with KYN28-24 metal-clad, withdrawable switchgear. The units feature vacuum circuit breakers, intelligent microprocessor-based protection relays, electric operating mechanisms, and independent pressure-relief channels, meeting stringent requirements for insulation, voltage withstand capability, and safety. Key Equipment Specifications
Model: KYN28-24 Armored Removable AC Metal-Enclosed Switchgear
Rated Voltage: 24kV (compatible with 20kV distribution systems)
Rated Insulation Level: Power frequency withstand voltage 65kV; lightning impulse withstand voltage 125kV; insulation margin significantly higher than 12kV switchgear
Rated Current: 1250A/1600A
Short-time Withstand Current: 25kA/4s
Cabinet Structure: Metal-clad, fully enclosed, with four independently separated compartments (busbar, circuit breaker, cable, and instrument compartments)
Operation Mode: Removable truck-type; features three positions: Service, Test, and Isolated
Safety Features: Dual mechanical and electrical interlocking; "Five-Prevention" interlock system to prevent operational errors; independent pressure relief channels
Protection Rating: IP4X (dust-proof and foreign-object-proof); suitable for harsh industrial environments
High Insulation for 20kV Grids: The 24kV high withstand voltage rating resolves issues regarding overvoltage and insufficient insulation in 20kV systems, effectively preventing flashover and breakdown accidents.
Safe, Independently Separated Structure: Functional compartments are fully isolated; a fault in a single circuit will not propagate to the busbar or adjacent cabinets, keeping the fault scope controllable.
Rapid Truck Replacement: The circuit breaker truck can be withdrawn and replaced with a spare; emergency repairs do not require prolonged power outages, ensuring continuous production line operation.
Comprehensive "Five-Prevention" Interlocking: Effectively prevents critical electrical accidents such as incorrect opening/closing, closing with the grounding switch engaged, or opening the door while live, ensuring high safety during operation and maintenance.
Suitable for Dusty Industrial Conditions: Fully enclosed cabinet structure effectively resists dust and condensation while preventing insulation aging, ensuring stable long-term operation.
Stable and Reliable Insulation: The 24kV high withstand voltage design is perfectly suited for the plant's 20kV grid and industrial switching overvoltages; no flashovers, breakdowns, or insulation failures have occurred since commissioning.
Strong Fault Isolation Capability: The independent compartment structure completely prevents fault propagation; protection operations are precise, with no instances of unwanted tripping or failure to trip. Significantly improved maintenance efficiency: Features a withdrawable truck-type design allowing for rapid replacement with a spare unit, reducing maintenance downtime by over 80%.
Extended equipment lifespan: Dust-proof, moisture-resistant, and aging-resistant construction ensures suitability for harsh industrial environments and results in an extremely low failure rate.
Supports continuous heavy-duty production: Reliably handles the loads of high-impact, heavy-duty variable-frequency drive (VFD) equipment across the facility, ensuring an uninterrupted 24-hour power supply for production.
The KYN28-24 high-voltage switchgear is a premium model specifically designed for 20kV power distribution systems, heavy-duty industrial sites, and high-overvoltage operating conditions. Compared to standard 12kV switchgear, it offers superior insulation margins, higher voltage withstand ratings, robust overvoltage resilience, comprehensive safety interlocking, and ease of maintenance. It effectively resolves critical issues associated with 20kV industrial projects—such as voltage level mismatches, insufficient insulation, and high failure rates—making it the preferred standard choice for 20kV distribution systems in sectors including new materials, chemicals, mining, and large-scale industrial parks.
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No. 318, Weidian Road, Economic Development Zone, Yueqing City, Zhejiang Province, China
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