⚡ ANSI 50 Instantaneous & ANSI 51 Time-Overcurrent Protection Coordination (TCC)

SEL Microprocessor Protection Relay Calculator

Model protective relay settings and Time-Current Characteristic (TCC) coordination curves under IEEE C37.112: calculate ANSI 50 (instantaneous overcurrent), ANSI 51 (inverse time-overcurrent with pickup tap and Time Dial Settings TDS), ANSI 51N (ground fault), coordination time intervals (CTI 0.20-0.30s), and protection engineering profits.

1. Project & Operating Inputs

Substation Protection Relays Commissioned (Relay Count e.g. 14 Relays)

Switchgear Voltage Class (kV e.g. 13.8 kV Medium Voltage)

Customer Bid Price for Relay Programming, Testing & PE Stamp ($ / Relay)

SEL Relay Hardware, Doble Secondary Injection Test Set, Senior Relay Tech ($)

2. Financial Breakdown & Yield

IEEE C37.112 RELAY COORDINATION

Turnkey Relay Setting & Coordination Profit

Protection Engineering Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost