What is the current public version?
v0.1.0-beta.6 for Windows 10/11 x64. GitHub Releases is the package source of truth.
Current release
Release and authority
What is the canonical current-status document?
CURRENT_STATUS.md. Historical P* files are retained as milestone records and may describe older behavior.
Does ARVREL control field equipment?
No. Relay outputs, OLTC actions, and process controls are virtual only. There is no physical trip, operational GOOSE, OLTC motor, switching, or primary-equipment authority.
Does ARVREL support MMS control?
Yes, as a laboratory model for the virtual AVR/OLTC process. Browse/read, reports, and modeled SBO/SBOw controls exist, but accepted commands terminate inside the simulator.
Closed-loop feeder testing
TESTSET timing questions
What owns the measured trip time?
The accepted wired TESTSET BI1 edge. Internal relay TripLatched may request BO1 but is never read directly as the TESTSET result or trip auto-stop authority.
What happens if BO1→BI1 is disconnected?
The relay may still trip internally, but the TESTSET must report no external trip time and must not trip-auto-stop. This is a deliberate regression invariant.
What is TESTSET BI2?
BI2 is the wired generic ANY PICKUP input. It does not necessarily represent the pickup of the element that ultimately trips.
Why can BI2 be earlier than 50P pickup?
Another enabled element—such as an earth/time-overcurrent function—may pick up first and drive generic BO2. Operated-element P→T is correlated separately.
What is the beta.6 timing resolution?
The TESTSET metrology clock is integer microseconds with 1 µs resolution. BI samples at 10 kHz / 100 µs. Relay acquisition/protection advances at 4 kHz / 250 µs.
Is a 10 kHz BI sampler a claim of CMC equivalence?
No. The CMC-style profile is a behavioral modeling choice informed by relay-test-set concepts. ARVREL is not calibrated commercial test equipment and does not claim manufacturer equivalence.
What does the relay front end receive?
Instantaneous signed terminal samples, then modeled clipping, 16-bit-equivalent quantization, 1.5 ms input/filter delay, and a causal one-cycle rolling DFT. Source-side phasors are not substituted for relay ADC input in the closed-loop path.
Why does a 60 ms 50P delay show 60.000 ms P→T?
Definite timing starts at the first observed pickup frame. When 60 ms is exactly representable on the 250 µs relay grid, the operated-element record is exactly 60.000 ms.
Auto-stop, capture, and reset
Post-trip questions
Why do setpoints remain visible after auto-stop?
Configured setpoints are retained for repeatability. The actual output state is explicitly OUTPUT OFF · FROZEN CAPTURE.
Is the frozen waveform timestamp identical to BI1 trip time?
Not necessarily. The capture can belong to a later causal relay-processing frame. Evidence schema 9 records the relationship instead of conflating the two instants.
How many times should I press RESET?
Once. Beta.6 uses one deterministic reset transaction that drains stale causal acquisition, clears relay state once, releases contacts/BI inputs, and shows READY TO RE-ARM only after the full postcondition.
Does RESET erase completed timing evidence?
No. Completed TESTSET timing and frozen trip/event evidence are intentionally preserved.
Does relay RESET stop or restart the source?
No. Source and relay are separate equipment authorities. If the source remains energized, protection may legitimately reassert after reset.
What if reset cannot settle?
The transaction is bounded by a modeled 100 ms settle timeout and should expose diagnostic state. Repeated clicking should not be used to hide the underlying condition.
Transformer Differential
87T / REF questions
Can I test Transformer Differential without live SV?
Yes. Run the deterministic 10-scenario self-test and synchronized internal HV/LV/neutral secondary injection first.
What is the expected self-test result?
PASS · 10/10 · transformer-public-beta-v1.
Does the internal transformer injector use a second 87T algorithm?
No. It drives the existing transformer protection runtime so the UI does not duplicate 87T/REF logic.
Can phase residual substitute for neutral CT in REF?
No. Independent neutral/NGR current evidence is explicit. Calculated phase residual is not silently promoted to a neutral-CT input for REF authority.
When are two SV streams required?
For the external paired-SV live/replay transformer path. Internal two-sided injection is a separate no-external-stream workflow.
What transformer security is modeled?
H2/H5 security plus context-gated external-fault/CT-saturation behavior within the documented generic model.
IEC 61850 and live capture
Process-bus questions
Is Npcap required?
Only for live Sampled Values capture. Internal workflows and PCAP/PCAPNG replay do not require Npcap.
What does trust gating evaluate?
Complete windows, decode health, mapping/scaling provenance, freshness, smpCnt continuity, quality, SCL identity, svID, dataset, confRev, and source context.
Can degraded data remain visible?
Yes. Diagnostic visibility is separate from AllowsMeasurement, AllowsPickup, and AllowsTrip.
Can I use live capture on an operational process bus?
Not without explicit authorization and an approved test method. The public guidance is to use an isolated laboratory network.
Fidelity and certification
What ARVREL does not claim
Is it a calibrated relay test set?
No. Timing and source behavior are deterministic software models without traceable calibration or instrument uncertainty claims.
Is it a clone of a specific relay?
No. The default relay profile is generic. Exact anti-alias filters, ADC topology, burdens, channel skew, electrical BI thresholds, proprietary fast paths, and manufacturer uncertainty are not claimed.
Is it IEC 61850 certified?
No formal conformance certification is claimed.
Is it IEC 60255 type-tested?
No. Deterministic regression tests validate software behavior only.
Responsible use
Use synthetic or authorized evidence and preserve the boundary.
Do not publish proprietary captures, SCL files, credentials, IP plans, protected infrastructure information, or employer-confidential material. Do not use ARVREL as the sole basis for operational protection settings, commissioning acceptance, or switching decisions.