Accurate metering and protection are important in high-voltage electrical systems for both efficiency and safety reasons.
The following are the fundamental elements and their functions.
Potential Transformer (PT)
Reduces high voltage to a manageable level for metering & protection circuits.
Current Transformer (CT)
The Current Transformer (CT) minimizes high current levels proportionally for accurate measurement and protection, assuring safety and reliability.
HT Meter
HT Meter measures energy usage for billing & monitoring load demand.
VCB (Vacuum Circuit Breaker) Panel
Switches, protects, and isolates faults to prevent system damage.
Lightning Arresters & Earthing
Protect equipment from overvoltage surges & provide a reliable grounding system for added safety.
Electrical Flow Chart
Power Flow Connection
11kV Line → VCB Panel → CT&PT → HT Meter → Load/Transformer
Points to Remember
CT/PT Accuracy Class
Choose 0.2S (or) 0.5 for accurate metering and protection.
Metering & Contract Demand
To prevent penalties, ensure metering setup fits with contract demand.
Periodic Testing & Calibration
Periodic testing and calibration improve measurement accuracy & system reliability.
Proper installation and maintenance of these components improves system efficiency, safety, & reliability.