The KYN28-24(Z) series armored removable AC metal-enclosed switchgear is a complete power distribution device suitable for 20kV three-phase AC 50/60Hz single bus and single bus section systems. It is widely used in power plants, small and medium-sized generator transmission, power distribution in industrial and mining enterprises, secondary substations, and the starting control of large high-voltage motors. The equipment integrates advanced control, protection, and monitoring functions to ensure system reliability and operational safety.
High Safety Interlock System
The switchgear is equipped with a comprehensive “five prevention” interlock mechanism, which effectively prevents operations that could lead to accidents. It stops the circuit breaker from being pushed or pulled under load, prevents incorrect opening or closing, ensures grounding safety, and avoids unauthorized access to live compartments. These safety features make it a high-performance and reliable power distribution device for modern electrical systems.
The design conforms to major international standards including GB3906, GB/T11022, IEC60298, and IEC 62271-202, ensuring compatibility and global applicability.
Operating Conditions
Ambient Temperature: -15℃ to +40℃
Altitude: ≤1000m
Relative Humidity: Daily ≤95%, Monthly ≤90%
Seismic Intensity: ≤8°
Installation Environment: Free from fire, explosion hazards, severe pollution, chemical corrosion, and strong vibration.
For applications beyond these parameters, please contact our technical team for customized solutions.
Product Advantages and Features
1. Compact 24kV Design
The structure of this switchgear is similar to that of mid-set 12kV switchgear but optimized for 20kV systems. It does not require composite insulation or interphase separators, delivering excellent insulation performance while maintaining a compact footprint.
2. Safe Structure and Flexible Installation
The switchgear consists of two main components: the cabinet and the withdrawable part (handcart). The cabinet is divided into four separate compartments, with an enclosure protection degree of IP4X (and IP2X when doors are open). It supports overhead and cable incoming/outgoing lines and can be configured into different power distribution schemes. Front installation, debugging, and maintenance are supported, allowing for back-to-back or wall-mounted layouts that save space and enhance flexibility.
3. Excellent Lightning Impulse Resistance
The KYN28-24(Z) switchgear offers high resistance to lightning impulse voltage, ensuring stable operation under transient overvoltage conditions and enhancing equipment lifespan in demanding environments.
4. Interchangeable Handcarts and Easy Operation
The handcart frame is made of precision-processed thin steel plates, ensuring robust structure and accurate alignment. Mechanical interlocks are safe, reliable, and flexible. Handcarts are classified into circuit breaker, voltage transformer, and isolation types—all interchangeable within the same specifications. Each handcart has defined disconnect, test, and working positions with secure locking and positioning systems. A screw mechanism ensures smooth insertion and withdrawal, making operation simple and efficient. For maintenance or inspection, a special transfer handcart can be used for convenient removal and replacement.
The KYN28-24(Z) armored removable AC switchgear provides an integrated solution combining compact design, high safety standards, reliable performance, and flexible operation. It is the ideal choice for modern power distribution systems in power plants, substations, industrial enterprises, and infrastructure projects.
Type description
Performance parameters
| Name | Unit | Value |
| Matched circuit breaker | ||
| Rated voltage | kV | 24kV |
| 1min powerfrequency withstandvoltage | kV | (50)65 |
| Rated impulse withstand voltage(peak | kV | 125 |
| Rated freguency | Hz | 50(60) |
| Ratedcurrent | A | 630/1250/1600/2000/2500/3150 |
| Rated current ofbranchbusbar | A | 630/1250/1600/2000/2500 |
| Rated short-time withstandcurrent | kA | 16/20/25/31.3 |
| Rated peak withstand current | kA | 40/50/63/80 |
| Rated shortcircuitduration | S | 4 |
| Protectionlevel | The enclosure isIP4xanditisIP2X whenthecompartmentdoorand circuit breaker chamber doorareopened | |
| Weight | kg | 800/1000 Rated currentabove1600A |
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