⭕ Core-Balance Toroidal CTs (50:5 / 100:5 Ratio Encompassing 3-Phase + Neutral)

Zero-Sequence Core-Balance CT Calculator

Size window-type toroidal Zero-Sequence Current Transformers (Core-Balance CTs) for sensitive ground fault detection under IEEE C37.90: calculate secondary output current (passing all 3-phase conductors and neutral through a single core window to measure true zero-sequence leakage flux with zero nuisance tripping from phase inrush currents), and relay margins.

1. Project & Operating Inputs

Feeder Circuits Monitored with Core CTs (Circuit Count e.g. 28 Feeders)

Primary Fault Trip Sensitivity (Amps e.g. 5.0A Ground Fault Sensitivity)

Customer Bid Price for Supplied & Landed Core-Balance Relays ($ / Feeder)

Toroidal Core CT, Digital Ground Relay, Shielded Cable & Electrician ($ / Unit)

2. Financial Breakdown & Yield

ZERO-SEQUENCE TOROIDAL CTS

Turnkey Ground Fault Relay Profit

Electrical Protection Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost