Free without login
Open and inspect the record
- Open matching CFG + DAT files
- Review analog relay waveforms
- Inspect digital event transitions
- Zoom, pan and use A/B cursors
- Review Frequency / df-dt
- Check measured values in Read Out
Free online COMTRADE viewer
Open COMTRADE CFG and DAT files online
Upload matching files to review waveforms, digital events, frequency and A/B timing.
Relay evidence overview
Review Waveforms, Event Timing and Protection Evidence in One Workspace
Upload matching CFG and DAT files to review relay waveforms, current and voltage channels, pickup/trip/breaker transitions, cursor timing, frequency behaviour and disturbance-recorder evidence directly in your browser.
CFG + DATRelay waveformsDigital eventsFrequency / df-dtA/B cursor timingNo desktop software
Example viewRelay fault evidence
CFG/DAT
PICKUPStart asserted
TRIPTrip output
52ABreaker open
1 Fault inception2 Trip output3 Breaker transition
Choose how you use ZeroRiskk
Start free, then unlock deeper relay analysis when needed
Open a record without an account, create a free account for saved records and advanced views, and pay only when you specifically request an AI fault-analysis report.
Free registered account
Unlock advanced analysis
- Save and reopen records
- Phasor and Computed views
- Fault Location support
- Distance / R-X trajectory
- Differential evidence review
- Engineering Report builder
Paid only when requested
AI Fault Analysis & Report
- Evidence-led fault interpretation
- Protection-engineer-style report
- Selected snapshots in context
- Optional relay settings and SOE
- Reviewable final PDF
- Separate payment per report
Evidence-first review
From disturbance record to clear relay-event understanding
ZeroRiskk keeps the review path practical: open the files, inspect the measured evidence, use advanced views only where inputs are available, and prepare a report when needed.
- 01
Upload CFG/DAT
Choose the matching configuration and waveform files in the upload section above.
- 02
Inspect waveforms
Review current, voltage and digital relay channels in a synchronized viewer.
- 03
Measure timing
Use the event table and A/B cursors for pickup, trip and breaker timing evidence.
- 04
Use advanced views
Sign in for Phasor, Computed, Fault Location, Distance/R-X and Differential evidence views.
- 05
Prepare the report
Create an Engineering Report or order AI fault analysis only when required.
Protection-engineering tools
Built around real disturbance-record review tasks
The interface focuses on relay evidence rather than generic charting, helping engineers move from waveform inspection to protection judgment.
Relay waveforms
Inspect current and voltage channels with synchronized time axes, zoom, pan and cursor measurements.
Digital events
Review pickup, trip, breaker and auxiliary transitions with measured event timing.
Frequency / df-dt
Examine frequency behaviour and rate-of-change evidence from suitable recorded channels.
Phasor & computed
Use signed-in views for vectors, sequence quantities, power and derived evidence.
Fault Location & R-X
Review apparent impedance, trajectory and location support when the required settings are available.
Differential evidence
Check operate/restraint evidence when suitable differential channels are available.
Engineering Report
Assemble selected evidence in an editable engineering report builder.
AI Fault Report
Order paid AI-assisted fault analysis separately after reviewing the available evidence.
Advanced views after sign-in
See the deeper relay-analysis views available with a free account
Preview the additional views used for phasors, impedance, fault location and power evidence after sign-in.
Vector magnitudes and angles
Phasor View
Preview current and voltage vectors with angle and magnitude evidence in the advanced Phasor view available after sign-in.
Apparent impedance trajectory
Distance / R-X
See how impedance trajectory and relay zones can be reviewed in the advanced Distance / R-X view after sign-in.
Estimated distance along the line
Fault Location
When the required settings are available, signed-in users can review estimated fault distance along the protected line.
Computed active, reactive and apparent power
Power Triangle
The Power Triangle connects measured voltage and current quantities with active, reactive and apparent power evidence.
Frequently asked questions
Online COMTRADE viewer FAQ
Practical answers about opening disturbance records, free tools, registration and reporting.
What is a COMTRADE file?
COMTRADE is a standard format used by protection relays, disturbance recorders and power-system monitoring devices to store sampled analog signals, digital states and event timing. A record commonly uses a CFG configuration file together with a DAT waveform file.
Can I open CFG and DAT files online?
Yes. Choose the matching CFG and DAT files in the upload section above and select Analyze Waveform. ZeroRiskk supports common COMTRADE 1991, 1999 and 2013 records, including ASCII, BINARY, BINARY32, FLOAT32 and FLOAT64 data.
Is the ZeroRiskk COMTRADE viewer free?
Visitors can use the free online viewer for waveform review, analog and digital channels, cursor timing, Frequency / df-dt and Read Out. A free registered account unlocks saved records and advanced protection-analysis views.
Do I need to install desktop software?
No. The visitor viewer runs in a modern web browser, so a protection engineer can begin reviewing a disturbance record without installing a desktop COMTRADE application.
Can I review relay trip waveforms and digital events?
Yes. The viewer displays analog current and voltage channels together with digital pickup, trip, breaker and auxiliary-state transitions when those channels are available in the uploaded record.
Which tools require a free registered account?
A free account lets you save and reopen records, use Phasor, Computed, Fault Location, Distance / R-X and Differential evidence views, and prepare engineering reports from selected evidence.
Is AI fault analysis free?
No. AI Fault Analysis & Report is a separate paid report option for registered users. The free viewer and the free registered engineering tools remain available separately.
Can I prepare an engineering report from the disturbance evidence?
Yes. Registered users can assemble selected waveform, timing and protection evidence in the Engineering Report builder. The separate paid AI report is used only when AI-assisted fault interpretation is requested.
Start with the free viewer
Open a COMTRADE disturbance record now
Use the upload section above for immediate waveform review, or create a free account to save records and unlock advanced protection-analysis views.