🛡️ IEEE C37.96 (87M Self-Balancing Flux Summation CTs, Fast Phase Fault Clearing)

Motor Differential Relay (87M) Calculator

Coordinate high-speed unit differential protection (ANSI 87M) for critical medium-voltage motors (>1,500 HP) using self-balancing core-balance flux-summation current transformers under IEEE C37.96: calculate sensitivity settings (clearing internal stator phase-to-phase and phase-to-ground faults in <1.5 cycles without tripping on external through-faults), and protection engineering profits.

1. Project & Operating Inputs

Large Critical Motors Protected (Motor Count e.g. 6 Multi-Megawatt Motors)

Available Bus Fault Current (kA e.g. 31.5 kA Symmetrical S/C)

Customer Bid Price for 87M Scheme Design & Commissioning ($ / Motor)

Window-Type 50:5 / 100:5 Flux Summation CTs, SEL-710 Relay, NETA Tech ($)

2. Financial Breakdown & Yield

IEEE C37.96 87M DIFFERENTIAL

Turnkey 87M Differential Scheme Profit

Substation Protection Engineering Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost