Technical Specifications

Core Functional Components

Current Transformer (CT)

Precision measurement and over-current protection

Voltage Transformer (VT)

Step-down voltage for metering and relays

AC Contactor

Remote-controlled circuit switching

Ground Switch

Safety discharge during maintenance

Protection Relays

Current/voltage/intermediate relay system

Control Interface

Buttons and indicator lamps for local operation

Primary Functions

• Circuit Isolation - Visible disconnection for maintenance safety

• Remote Operation - AC220V controlled switching capability

• Over-Voltage Protection - Voltage relay trip functionality

• Over-Current Protection - Current relay coordination

• Measurement & Indication - Real-time status monitoring

Design Features

1. EMI-Shielded Enclosure - Prevents electromagnetic interference

2. Compartmentalized Layout - Separate sections for HV/LV components

3. Safety Interlocks - Prevents ground switch operation when energized

4. Test Points - Accessible terminals for relay calibration

5. Viewing Windows - Visual position indicators without exposure

Industrial Applications

• Factory substation primary distribution

• Wind farm collector substations

• High-voltage motor control centers

• Industrial plant step-down transformers

• Mine power distribution systems

Compliance & Safety Standards

• IEC 62271-200: AC metal-enclosed switchgear

• IEC 60255: Measuring relays protection standards

• IEC 60044: Instrument transformer requirements

• ANSI/IEEE C37.20.2: Medium-voltage switchgear

• Partial discharge level: < 10pC at 1.1Ur

Installation Requirements

• Minimum clearance: 800mm front, 300mm sides/rear

• Concrete foundation with seismic anchoring

• Ambient temperature: -15°C to +40°C

• Relative humidity: < 95% (non-condensing)

• Altitude: < 1000m ASL (derating above)