Split Core CT vs. Rogowski Coil: Which is Best for Your Smart Meter System?

1. OPEN CT: Precision Under Pressure

• Problem: Traditional split-core CTs struggle with core misalignment, vibration-induced errors, and voltage spikes.

• Powerway’s Solution:

• Magnetic Core Innovation: Minimized air gaps between split ferrite/silicon steel cores ensure ≤0.5% ratio error (IEC 60044-1 0.5S grade).

• Durability & Safety: Built-in over-voltage protection and rugged housing withstand industrial vibrations (IEC 61010-1 certified).

• Smart Meter Integration: Compact, one-touch design allows direct connection to meters (5A/1A/0.1A outputs) without cutting power lines.

• Applications:

• Smart grid substations (250A–2,400A monitoring)

• Industrial machinery (CNC machines, pumps)

2. OPEN RCT: Rogowski Coil Advantages for Dynamic Systems

• Problem: High currents, harmonic-rich loads, and tight spaces challenge traditional CTs.

• Powerway’s Solution:

• Air Core Technology: No saturation at 250A–6,000A; tracks rapid current changes (μs response time).

• Flexible Installation: Split-clip design fits around live conductors in cramped panels (e.g., EV charging stations, wind turbines).

• Accuracy & Shielding: Optimized winding reduces external magnetic interference (NRC Series achieves ≤1% error from conductor positioning).

• Applications:

• Renewable energy (solar/wind inverters)

• High-power EV fast chargers

• For stable, low-cost installations: OPEN CTs are ideal for fixed, low-to-medium current smart meters.

• For high-current, dynamic systems: OPEN RCTs deliver unmatched frequency response and flexibility.