Product Overview

The KYN61-40.5 prefabricated, armored, and withdrawable AC metal-clad switchgear (hereinafter referred to as "switchgear") is primarily characterized by its use of ZN85-40.5, VD4, and VB2 type fully insulated vacuum circuit breakers paired with spring-operated mechanisms. The cabinet body is constructed from aluminum-zinc coated steel panels, enhancing the precision of the coordination between the handcart and the cabinet. As a result, pushing in and pulling out the handcart is effortless and highly interchangeable. The design boasts an attractive appearance, offers comprehensive solutions, and ensures safe, reliable operation.

This product is designed for use in 35kV three-phase, 50Hz AC power systems, serving as equipment in power plants, substations, and distribution rooms of industrial and mining enterprises to receive and distribute electrical energy. It features integrated functions such as control, protection, and monitoring.

This product complies with the following standards: GB3906 "3-35kV AC Metal-Enclosed Switchgear," GB/T11022 "Common Technical Requirements for High-Voltage Switchgear and Control Equipment Standards," DL/T404 "Technical Specifications for Ordering AC High-Voltage Switchgear," and IEC298 "AC Metal-Enclosed Switchgear and Control Equipment Rated 1kV and Above up to 52kV."

Normal operating conditions

Ambient air temperature: -15°C to +40°C.

Altitude: 2,500 m and below.

Humidity conditions: The daily average must not exceed 95%, and the daily average water vapor pressure should remain below 2.2 kPa; meanwhile, the monthly average humidity should stay below 90%, with the monthly average water vapor pressure not surpassing 1.8 kPa.

Seismic intensity: Not exceeding magnitude 8.

A location free from obvious contaminants such as corrosive or flammable gases.

Note: If conditions exceed the above-mentioned normal usage guidelines, users may consult with our company.

Ordering Instructions (Please specify when placing your order)

1. Main circuit scheme number, purpose, single-line system diagram, arrangement drawing, and distribution room layout plan, etc.

2. Schematic diagram of the auxiliary circuit wiring and terminal arrangement diagram.

3. Model, specifications, and quantity of electrical components within the switchgear.

4. Requirements for control, measurement, and protection functions of switching equipment, as well as requirements for other interlocking and automatic devices.

5. If bus bridges are required to connect switchgear units or incoming feeder cabinets, please provide specific data such as the rated current-carrying capacity of the bus bridge, its span length, and the height from the ground.

6. When attachments or spare parts are needed, please specify the type and quantity required.

7. If switchgear is to be used under special environmental conditions, detailed specifications should be provided at the time of order.

Main technical specifications

1. Technical Specifications of KYN61-40.5 Stainless Steel Switchgear

2. Technical Specifications for ZN85-40.5 Circuit Breaker with Spring Operating Mechanism (Integrated Unit)

Structural features

This product consists of two main components: the cabinet body and the handcart assembly. The cabinet body is fabricated from bent steel plates, powder-coated, and then assembled using bolts. Functionally, it is divided into four distinct sections: the busbar chamber, relay and instrument room, handcart compartment, cable chamber, and busbar room—each section separated by grounded metal partitions. The cabinet enclosure boasts an IP4X protection rating, while the handcart compartment door, when open, provides an IP2X protection level.

This switchgear features a variety of main circuit configurations, including cable-in/cable-out, overhead line-in/line-out, busbar interconnection, isolation, voltage transformers, and surge arresters. The busbars are equipped with composite insulation, while phase-to-phase connections and busbar joints are fitted with molded insulating sleeves made from flame-retardant materials. Additionally, adjacent cabinets housing the main busbars are separated by busbar bushings, effectively preventing the spread of potential faults and providing auxiliary support for the main busbars. The cable compartment is also outfitted with grounding switches and overvoltage protection devices.

The contact box is equipped with metal shutters that automatically open as the handcart moves from the disconnected/test position to the working position, and close automatically when the handcart moves in the opposite direction, effectively isolating it from high voltage. Interlocks between the main switch, handcart, earthing switch, and cabinet door are all implemented via a robust mechanical locking mechanism, ensuring compliance with the "five-protection" safety requirements.

The circuit breaker trolley uses a lead screw-driven actuation mechanism equipped with an overrunning clutch. The lead screw and nut system ensures smooth operation, allowing the trolley to easily move between the test position and the working position. Thanks to the self-locking feature of the lead screw-nut assembly, the trolley can be securely locked in the working position, preventing unintended movement caused by electromagnetic forces and thereby avoiding potential accidents. Meanwhile, the overrunning clutch automatically disengages the operating shaft from the lead screw shaft when the trolley is moved back to the test position or forward to the working position, enabling the shaft to spin freely—thus safeguarding against misoperation that could damage the actuation mechanism. Other trolleys are fitted with a lever-based actuation system instead. Both the test and working positions are secured by positioning pins for added safety. The cabinet’s overall dimensions are: Width x Depth x Height (mm): 1400 x 2800 (3000) x 2600.

Technical specifications

Schematic Diagram of Switchgear Structure

A. Busbar Chamber; B. Drawer Unit Chamber; C. Cable Chamber; D. Relay and Instrument Chamber; 1. Lifting Ring; 2. Main Busbar; 3. Small Busbar Chamber Cover Ring; 4. Instrument Chamber Door; 5. Branch Busbar; 6. Busbar Bushing; 7. Contact Box; 8. Dummy Busbar Coil; 9. Nameplate; 10. Lighting Fixture; 11. Drawer Unit Chamber Door; 12. Current Transformer; 13. Hinge; 14. Insulator; 15. Zinc Oxide Surge Arrester; 16. Insulating Partition; 17. Earthing Switch; 18. Valve Assembly; 19. Vacuum Circuit Breaker Drawer; 20. Small Busbar Terminal Chamber

Main Circuit Diagram of the Switchgear Cabinet

Main circuit electrical components	A single proposal number	01	02	03	04	05
	Main Circuit Diagram
	Vacuum Circuit Breaker ZN85-40.5	1	1	1	1	1
	Current Transformer LDJ5-35		1-3	1-3	4-6
	Voltage Transformer JD29-35
	Surge Arrester HY5W22	Choose 0 or 3	Choose 0 or 3	Choose 0 or 3	Choose 0 or 3	Choose 0 or 3
	Grounding switch JN12-35	0 - Selection	0-1 Selection	0 - Selection	0 - Selection	0 - Selection
	Show with a dot	0 - Selection	0-1 Selection	0 - Selection	0 - Selection	0 - Selection
	Fuse XRNP-35
	Transformer SC9-35
	Uses	Overhead incoming (or outgoing) line	Overhead incoming (or outgoing) line	Overhead incoming (or outgoing) line	Overhead incoming (or outgoing) line	Cable incoming (or outgoing) line