Relay Testing
SEL Relay - CMC 256-Style Test Set
A deep relay-testing trainer for SEL feeder relay work using a CMC 256-style training set face, current outputs, binary timing input, test switch discipline, and troubleshooting review.
Save as-found settings and event records
Select the SEL-751 feeder relay profile, isolate the test switches, and mark the as-found settings/events saved.
Current Objective
Save as-found settings and event records
Select the SEL-751 feeder relay profile, isolate the test switches, and mark the as-found settings/events saved.
Why
Relay testing starts with evidence. If settings, SER, events, targets, and logic are not saved, the report cannot prove what changed.
Expected
SEL-751 selected, test switches isolated, as-found files saved.
Safety
Use test switches, trip blocks, station DC controls, and customer outage procedure. This simulator is training only.
Relay Profile
Test Switches
Relay Files
Binary Input
CMC 256-style training set
Relay Test Set
SAVE AS-FOUND SETTINGS AND EVENT RECORDS
IA IB IC IN | BI1 TIMER | 60.00 Hz | TRIP CONTACT
Current Outputs
Voltage Outputs
Binary Inputs / Timer
SEL relay under test
SEL-751 profile
PLAN
Group 1 | 60Hz | Targets/Event Review
Relay Test Flow
Connection Map
IA
Open
IB
Open
IC
Open
IN
Open
VA
Open
VB
Open
VC
Open
VN
Open
BI1
Open
Mistakes
No mistakes yet. Correct wiring, settings, timing input, and diagnosis all matter.
Relay Results
Run each step to generate relay pickup, timing, output, and evidence readings.
Profile History
No saved attempts yet.
Final Report
Relay Testing Notes
Secondary injection proves how the relay responds to known signals. It does not prove CT primary wiring unless that wiring is included in the scope.
Pickup means the element asserted. Timing means the element and output path operated through the expected logic and contact.
For SEL relays, save settings, SER/events, targets, and as-left files. Make sure temporary blocks, test switches, and outputs are restored.
All values here are placeholders. Compare real work to the coordination study, relay settings, manufacturer instructions, and approved procedures.