System Overview

This indoor armored AC metal-enclosed switchgear (IP20) provides complete secondary distribution for 10-12kV networks. Key features include vacuum circuit breakers with 16kA breaking capacity, dual-winding instrument transformers, and integrated protection relays.

Primary Specifications

Core Components

Vacuum Circuit Breaker

• Rated Voltage: 12kV

• Rated Current: 630A

• Breaking Capacity: 16kA

Voltage Transformer

• Type: Epoxy Cast / Full Insulation

• Rated Voltage: 10kV

• Ratio: 10kV/100V

• Accuracy: Class 0.5

Current Transformer

• Type: Epoxy Cast

• Rated Voltage: 10kV

• Ratio: 150A/5A/5A (dual secondary)

• Accuracy: Class 0.5

Isolation Switch

• Rated Voltage: 10kV

• Max Voltage: 12kV

• Thermal Stability (4s): 12.5kA

• Dynamic Stability: 31.5kA

• Circuit Resistance: <60 μΩ

Auxiliary Switch

• Rated Voltage: 12kV

• Rated Current: 630A

Protection & Control Features

• Multi-Stage Protection: Overcurrent + Overvoltage + Fast Trip (≤2 cycles)

• Dual Control Modes: Local manual operation + Remote SCADA control

• Measurement System: Integrated meters for V/I/PF monitoring

• Safety Interlocks: Mechanical locking between isolator and breaker

• Visual Indicators: LED status lights for circuit conditions

Design Advantages

Armored Construction

Zinc-plated steel compartmentalization contains arc faults per IEC 62271-200 Annex AA

Modular Components

Draw-out breaker design enables maintenance without de-energization

Dual Secondary Windings

Independent 5A outputs for protection relays and metering equipment

Typical Applications

Testing & Certification

• Dielectric test: 28kV AC for 1min (IEC 60060-1)

• Short-circuit test: 16kA/1s (IEC 62271-100)

• Temperature rise test: 65K max @ 630A (IEC 60298)

• Mechanical endurance: 10,000 operations