KYN61-40.5 33kV Indoor VCB Switchgear Panel

Huajidian is a specialized electrical equipment manufacturer dedicated to the R&D, manufacturing, and customized solution design of complete sets of high- and low-voltage switchgear. The entire KYN61-40.5 33kV Indoor VCB Switchgear Panel series undergoes a comprehensive, vertically integrated production process—from independent design and sheet metal fabrication to high-voltage assembly—all within our own standardized manufacturing facilities. As a product from a professional electrical equipment manufacturer, this switchgear has been successfully deployed and commissioned in numerous engineering projects across China—including power grids, industrial and mining facilities, and data centers—where its operational stability has been validated through real-world application. Furthermore, we offer customized configuration and sizing services to clients worldwide.

The KYN61-40.5 (33kV Indoor VCB) Armored Withdrawable Metal-Enclosed Switchgear can be paired with the KYN28A-12 auxiliary cabinet (specifically the AH6 or AT3 cabinet models designed for transformer outgoing circuits). Serving as a core component within 12kV/33kV, 50Hz AC medium-voltage distribution systems, it primarily receives power from the transformer side and safely distributes the stepped-down electricity to downstream loads. Its functions include real-time monitoring of electrical parameters, protection against line overloads and short circuits, and circuit breaker switching control. Featuring an air-insulated, fully metal-armored enclosed structure, this product offers exceptional safety margins and operational reliability, making it an indispensable piece of critical equipment for modern substations and industrial power distribution systems.

Product Basic Parameters Table

Core Technical Specifications

1. Rated Voltage: 12kV (Compatible with standard 10kV power grids; equipment insulation is designed for 40.5kV, meeting the requirements for 33kV operating conditions).

2. Rated Current: 630A (Applicable to both the main busbar and the accompanying circuit breaker).

3. Rated Frequency: 50Hz.

4. Withstand Voltage Ratings: Power frequency 1-minute withstand voltage: 42kV (to ground / phase-to-phase); Lightning impulse withstand voltage: 75kV (to ground / phase-to-phase).

5. Short-Circuit Breaking Capacity: Circuit breakers can be selected according to specific requirements, with a breaking capacity range of 20kA to 31.5kA.

6. Protection Class (IP Rating): Entire cabinet: IP4X; Circuit breaker compartment (with door open): IP2X.

7. Applicable Standards: GB 3906, IEC 62271-200, and other specifications for medium- and high-voltage switchgear.

Cabinet Structural Design

1. Upper Instrument & Relay Compartment: Houses a built-in multi-functional power meter, live-line display device, and operation indicator lights, enabling real-time online monitoring of electrical parameters such as voltage and current.

2. Middle Circuit Breaker Compartment (Core Operating Area): Equipped with a 630A withdrawable vacuum circuit breaker, mechanical interlock operating handle, and status indicators. The withdrawable unit can be completely extracted, allowing for front-access maintenance without the need to shut down the entire cabinet, thereby significantly reducing power outage maintenance time.

3. Lower Cable Compartment: Features ample internal space to facilitate the routing and wiring of outgoing cables, as well as subsequent inspection and maintenance.

Product Advantages

The KYN61-40.5 33kV Indoor VCB Switchgear Panel is equipped with a complete "Five-Prevention" mechanical interlocking system. This system effectively eliminates potential hazards associated with operational errors—such as accidental opening or closing of the circuit breaker, closing the grounding switch while the circuit is live, or opening the cabinet door while the circuit is live—thereby preventing human-induced safety accidents. The product has successfully passed the grid-connection acceptance standards for the domestic power industry.

Product Application Scenarios

1. 10kV distribution rooms within domestic urban power grid substations and municipal renovation projects;

2. Main power distribution stations within the plant complexes of large-scale mining operations and heavy metallurgical industries;

3. Locations requiring high-reliability, uninterrupted power supply—such as high-rise commercial buildings, Grade-A tertiary hospitals, and IDC data centers.

Real-World Engineering Case Study

In 2024, serving as the official project supplier, Huajidian undertook the renovation of a 33kV mining substation in Northern China. The project involved the procurement of 18 units of KYN61-40.5 33kV Indoor VCB Switchgear Panels, utilized to upgrade the power distribution circuits for two AT3 transformers within the mining complex.

1. Project Background

The existing aging, fixed-type 35kV switchgear suffered from insulation degradation and posed significant risks of arc faults. Consequently, the owner selected Huajidian’s armored withdrawable switchgear to replace the obsolete equipment and to elevate the safety standards of the mining area's power distribution system.

2. Implementation Results

The equipment has operated continuously under full load for 12 months with zero unexpected failures. The withdrawable trolley structure reduced the duration of routine maintenance tasks from the original 8 hours down to just 2.5 hours. Furthermore, the "Five-Prevention" interlocking system successfully averted three potential risks of operational error during annual equipment inspections. Following the successful commissioning of Phase I, the client placed a follow-up order for power distribution equipment for the plant's Phase II expansion, thereby providing real-world validation of the product's performance under heavy-load operating conditions.

FAQ

Q1: For specialized industrial projects, can Huajidian adjust the short-circuit breaking parameters of the KYN61-40.5 switchgear?

A1: Yes. Based on the specific short-circuit parameters of the project site's power grid, we can install vacuum circuit breakers of varying specifications to customize the breaking capacity within the 20kA to 31.5kA range. All customized parameters strictly adhere to both Chinese National Standards and IEC standards, and the complete switchgear unit undergoes rigorous testing prior to factory shipment.

Q2: What are the core differences between the KYN61-40.5 (33kV) and the standard KYN28A-12 (10kV) switchgear models? 

A2: The KYN61-40.5 is designed to meet 33kV/40.5kV insulation standards; it features thickened internal partitions and a reinforced arc-resistant structure, making it primarily suitable for transformer incoming and outgoing lines in 33kV-class substations. The KYN28A-12 is designed for standard 10kV power distribution lines. Both cabinet models can be integrated and installed side-by-side within the same substation—much like the AH6 integrated solution—to form a complete switchgear assembly.

Q3: Does Huajidian provide installation guidance and after-sales technical support following the shipment of the KYN61-40.5 33kV Indoor VCB Switchgear Panels?

A3: We provide a complimentary review of project technical parameters prior to production. For standard orders, we offer remote technical guidance for installation. For large-scale engineering projects, we can arrange for engineers to visit the project site for on-site commissioning, subject to negotiation based on the project's location.

Guidelines for Procurement Partners

Global buyers are welcome to schedule an on-site visit to our factory. You may consult with the Huajidian sales team regarding personalized customization requirements—such as cabinet dimensions and component configurations—to create a bespoke transformer outgoing switchgear solution that fully complies with your local power grid standards.