Junray Electrical KYN61-40.5 AC Metal-Enclosed Switchgear is an armored withdrawable switchgear specifically designed for 35kV power distribution systems. Rated at 40.5kV, it features a power frequency withstand voltage of 95kV and a lightning impulse withstand voltage of 185kV, delivering exceptional insulation margins that far exceed those of standard 12kV or 24kV switchgear. Rated current ranges from 630A to 4000A, with a short-time withstand current of up to 31.5kA/4s. The cabinet employs a five-compartment fully partitioned design (busbar, circuit breaker, cable, instrument, and pressure relief compartments), equipped with a withdrawable truck mechanism and comprehensive electrical and mechanical "Five-Prevention" interlocking. Suitable for 35kV substations, waste-to-energy power plants, mega industrial parks, mega data centers, and large-scale infrastructure projects.
KYN61-40.5 AC Metal-Enclosed Switchgear 40.5kV High Voltage Rating: Adapted for 35kV Power Grids. With a rated voltage reaching 40.5kV, this equipment is perfectly tailored for domestic 35kV power grids. Compared to standard 24kV central-cabinet switchgear, it is capable of withstanding higher voltages, thereby fully meeting the power distribution requirements of 35kV networks.
Larger Cabinet, Enhanced Insulation Protection: The enlarged cabinet structure—combined with insulation safeguards specifically designed for 35kV systems—enables the equipment to safely handle high 35kV voltages. The increased insulation clearance effectively prevents high-voltage breakdown, ensuring the stable and reliable operation of the high-voltage system.
IP5X Ultra-High Protection: The enclosure boasts an IP5X protection rating—superior to that of standard 24kV central-cabinet switchgear. This rating ensures effective resistance against dust and moisture ingress, allowing the equipment to operate stably and reliably even in environments characterized by high humidity or heavy dust, thereby safeguarding the internal high-voltage components.
"Five-Prevention" Interlocking: Ultimate Safety. Featuring a dedicated "Five-Prevention" interlocking system, this equipment completely eliminates the risk of operational errors. It prevents the accidental opening or closing of circuit breakers; prohibits the operation of disconnectors under load; prevents the application of ground wires to live circuits; prohibits the closing of circuit breakers while ground wires are connected; and prevents accidental entry into live compartments. This ultimate level of safety protection ensures the operational safety of 35kV high-voltage systems.
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Rated Voltage |
AC40.5KV |
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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 |
IP4X Structure |
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Center-Mounted Draw-out Structure Installation Method |
Floor-standing |
1. Dedicated 35kV Insulation: Features a higher grade of insulation protection, designed to accommodate high-voltage systems up to 40.5kV with increased insulation clearance.
2. IP4X Sealed Protection: Offers a superior level of ingress protection—dustproof and water-resistant—making it suitable for operation in harsh environmental conditions.
3. "Five-Prevention" Interlock Protection: Employs a dual mechanical and electrical interlocking system to prevent operational errors, ensuring maximum safety.
4. Floor-Standing Draw-out Structure: Features a withdrawable trolley design that allows for maintenance without the need for a power outage, offering convenience and efficiency.
5. Large-Specification High-Voltage Busbars: Utilizes thickened copper busbars specifically rated for 35kV applications, providing high current-carrying capacity, robust insulation, and stable performance during high-current operation.
35kV Substations: High-voltage outgoing and incoming feeder cabinets within 35kV grid substations.
Mega Industrial Parks: High-voltage power distribution for industrial parks connected to a 35kV grid.
Mega Data Centers: 35kV high-voltage power distribution for mega-scale data centers.
Large-scale Infrastructure Projects: 35kV high-voltage power distribution for major infrastructure developments.
High-Voltage Industrial Facilities: Mega-scale industrial plants requiring 35kV power distribution.
The KYN61-40.5 switchgear is produced strictly in accordance with the national standards. Each KYN61-40.5 AC Metal-Enclosed Switchgear has undergone structural testing, withstand voltage test, interlock test, and protection test to ensure stable and safe operation. Customization of units and functions is supported. You can customize the exclusive cabinet according to your 35kV power distribution plan, and it will perfectly fit your 35kV power distribution project. The process is mature and durable.
This project involves the construction of a new 35kV substation for a municipal solid waste incineration power plant. Classified as a Tier-1 load power supply project, it is responsible for the harmless treatment of urban solid waste and grid-connected power generation using waste heat. The project is equipped with two 35kV main transformers. The plant utilizes a 35kV high-voltage distribution system to power critical, heavy-duty equipment—such as boilers, steam turbine generators, induced draft fans, and feedwater pumps—and facilitates the transmission of surplus power to the grid.
Due to the high voltage level (35kV), high short-circuit currents, and significant surge loads during equipment startup and shutdown, the system demands exceptionally high standards for insulation, breaking capacity, and safety protection. The high-voltage distribution room exclusively employs KYN61-40.5 indoor metal-clad, withdrawable high-voltage switchgear. These units serve as the core distribution equipment for incoming and outgoing lines, potential transformers (PT), bus-tie connections, grid interconnection, and main transformer protection.
Voltage Level Incompatibility: Standard 10kV/20kV switchgear lacks the necessary voltage withstand rating to meet 35kV system requirements for insulation and overvoltage tolerance; thus, their use is strictly prohibited.
High System Short-Circuit Current: Grid-connected power plants experience high short-circuit surge currents. Standard switchgear cabinets lack sufficient breaking capacity, posing risks of explosion or dielectric breakdown.
Harsh and Complex Operating Conditions: Power plant equipment operates continuously (24/7) with significant load fluctuations and frequent startup/shutdown cycles, placing extreme demands on both mechanical and electrical durability.
Strict Power Reliability Requirements: As a facility vital to public welfare, the incineration plant cannot tolerate unscheduled outages or fault propagation; it requires rapid maintenance and fault isolation capabilities.
High Safety Standards for O&M: The 35kV high-voltage system entails significant risks, necessitating comprehensive "Five-Prevention" interlocking mechanisms, independent pressure relief systems, and fully compartmentalized protective structures.
In accordance with 35kV substation design standards and the plant's heavy-duty operating conditions, the facility is uniformly equipped with KYN61-40.5 metal-clad, withdrawable switchgear. The configuration includes 35kV vacuum circuit breakers, intelligent integrated protection devices, independent pressure relief channels, and forced ventilation/dehumidification systems, ensuring compliance with the rigorous operational standards required for grid-connected power generation.
Key Equipment Specifications
Model: KYN61-40.5 Indoor Armored Withdrawable AC Metal-Enclosed Switchgear
Rated Voltage: 40.5 kV (suitable for 35 kV distribution systems)
Rated Insulation Level: Power frequency withstand voltage 95 kV; lightning impulse withstand voltage 185 kV; exceptional insulation margin
Rated Current: 1250 A – 1600 A
Rated Short-time Withstand Current: 31.5 kA/4s
Cabinet Structure: Five-compartment independent fully partitioned design (busbar, circuit breaker, cable, instrument, and pressure relief compartments)
Operating Mechanism: Withdrawable circuit breaker truck; features four positions: Service, Test, Isolated, and Withdrawn
Safety Features: Comprehensive electrical and mechanical "Five-Prevention" interlocking; independent top-mounted pressure relief channel; live-line indication; forced interlocking
Protection Class: IP4X (dust-proof and condensation-resistant); suitable for long-term continuous operation in power plants
Superior Insulation for 35 kV Systems: 40.5 kV high-withstand-voltage design effectively resists grid switching overvoltages and lightning surges, eliminating flashover, tracking, and dielectric breakdown faults.
High Short-circuit Breaking Capacity: 31.5 kA breaking capacity fully meets the demands of grid-connected short-circuit impact conditions, ensuring rapid and precise fault clearing.
Full Partitioning to Prevent Fault Propagation: Independent isolation of functional compartments ensures a fault in a single cabinet does not affect the entire busbar section, safeguarding the main system.
Withdrawable Design for Rapid Maintenance: Withdrawable circuit breaker truck with spare unit availability allows for quick replacement in the event of a fault, significantly reducing downtime for maintenance.
Intelligent O&M for Grid Integration: Equipped with microprocessor-based protection, remote monitoring/control, and fault recording capabilities to meet grid acceptance and remote dispatch requirements.
Zero-Fault Operation of High-Voltage System: Stable insulation performance post-commissioning with no flashover, breakdown, or abnormal temperature rise; perfectly suited for 35 kV high-voltage, high-current operating conditions. Precise and reliable protection: The protection device avoids both nuisance tripping and failure to trip in the face of load fluctuations or transient surges; it ensures rapid fault clearing, thereby safeguarding equipment and generating units.
Fault risks fully controlled: Features independent compartmentalization and pressure-relief structures, completely eliminating major safety incidents such as arc propagation or cabinet rupture.
Significantly improved O&M efficiency: The withdrawable (truck-type) design facilitates convenient maintenance without requiring a total substation shutdown, ensuring continuous power generation and stable grid connection.
Successfully passed grid acceptance: Equipment parameters, insulation levels, and protection configurations fully comply with acceptance standards for 35kV grid-connected substations.
The KYN61-40.5 is a premium high-voltage switchgear model designed specifically for the 35kV voltage class. It is widely used in waste-to-energy plants, photovoltaic power stations, main step-down substations for large industrial facilities, 35kV-side applications for 110kV substations, and key municipal energy projects. Compared to 12kV and 24kV models, it offers core advantages such as higher voltage withstand ratings, greater breaking capacity, ample insulation margins, comprehensive safety protection, and suitability for high-voltage grid-connection conditions; it stands as the mainstream standard switchgear model for 35kV indoor power distribution systems in China.
Address
No. 318, Weidian Road, Economic Development Zone, Yueqing City, Zhejiang Province, China
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