Sequence of High-Voltage Distribution Cabinets
High-voltage distribution systems typically follow the sequence: Incoming Cabinet → Metering Cabinet → Feeder Cabinet, with optional PT and Tie Cabinets for monitoring and interconnection.
1. Incoming Cabinet
The incoming cabinet is the first point of entry for high-voltage electricity from the power grid or upstream substation. Its primary role is to carry the total load and provide a disconnection point for maintenance or fault conditions. It usually contains a Vacuum Circuit Breaker (VCB) for high-voltage systems, current transformers (CTs) for measurement, surge arresters for overvoltage protection, and an integrated protection relay to monitor overcurrent, zero-sequence, and other signals, issuing trip commands when necessary .
2. Metering Cabinet
The metering cabinet is positioned after the incoming cabinet and before the feeder cabinet. Its main function is to accurately measure electrical energy consumption. It houses voltage transformers (PTs) and current transformers (CTs) with high accuracy (typically 0.2S or 0.5S) and avoids any switching components to prevent interference with measurements. This ensures all outgoing current is recorded correctly for billing and monitoring purposes .
3. Feeder Cabinet
The feeder cabinet, also called the outgoing cabinet, connects directly to user equipment such as motors, lighting, or production lines. It distributes power safely to various loads and may include protective devices to isolate faults in individual feeders .
4. PT Cabinet (Optional)
A PT (Potential Transformer) cabinet acts as a voltage “translator,” converting high-voltage signals into lower, measurable voltages for protection devices and meters. It ensures accurate voltage monitoring and enables protection relays to respond to anomalies like overvoltage or phase imbalance .
5. Tie Cabinet (Optional)
The tie cabinet functions as an interconnection point between two independent distribution systems. It allows power to flow between systems during outages or overloads, ensuring continuity and reliability. The tie cabinet can automatically switch to support the affected system, minimizing downtime .
Summary of Sequence
The typical sequence in a high-voltage distribution system is: Incoming Cabinet → Metering Cabinet → Feeder Cabinet, with PT and Tie Cabinets integrated as needed for monitoring and interconnection. Each cabinet plays a critical role in protection, measurement, and reliable power distribution, ensuring safety and operational efficiency in industrial, commercial, or residential power systems .
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