Comparison of High-Voltage Switchgear Selection: How to Choose Between KYN28 Medium-Voltage Cabinet and XGN Fixed Cabinet

In 10kV distribution projects, KYN28 medium-voltage cabinets and XGN fixed cabinets are the two most common high-voltage switchgear types. Their structural principles are completely different, and improper selection may lead to frequent faults or even safety accidents. This article provides an in-depth comparison from three dimensions: structure, function, and scenarios.

I. Structural Principle Comparison

KYN28: Metal-enclosed Withdrawable

The core feature is that the vacuum circuit breaker is mounted on a medium-voltage truck, which can be entirely pulled out of the cabinet for maintenance or replacement without de-energizing and dismantling the cabinet. Maintenance time can be reduced to one-third of that of traditional fixed types. The four independent compartments of the cabinet are completely isolated by metal enclosures, effectively preventing arc fault propagation.

XGN: Box-type Fixed

The circuit breaker is permanently fixed inside the cabinet and cannot be withdrawn. Switching is achieved through disconnectors, with simple structure and lower cost. However, replacing the circuit breaker requires de-energization and disconnection of busbar connections, with greater difficulty and longer maintenance time.

II. Functional Characteristics Comparison

III. Selection Recommendations

Scenarios for Choosing KYN28

• Main switches in large substations (high reliability required)
• Frequently operated motor and capacitor bank circuits
• High short-circuit current scenarios (≥31.5kA)
• Distribution centers requiring intelligent monitoring and remote operation
• Important loads where outage for maintenance has significant impact

Scenarios for Choosing XGN

• Small and medium-sized projects with limited budget
• Ring network power supply nodes, terminal distribution
• Environments with stable line conditions and infrequent maintenance needs
• Configurations in small substations and compact substations
• Occasions with stable loads and simple protection requirements

IV. Summary

KYN28 excels in safety, convenient maintenance, and flexible expansion, suitable for important loads and large projects; XGN wins by simple structure and low cost, suitable for small and medium projects and ring network applications. The key to selection is to clarify the project's safety level requirements, maintenance conditions, and budget constraints, rather than simply pursuing the higher-end model.