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Tools for the protection engineer
The look-ups and calculations we do every day in substations and industrial plants, ready to use on a phone or a desktop. They are free and everything is calculated in your browser: no data is sent anywhere.
Protection
Settings, instrument transformers and protection functions.
ANSI / IEEE C37.2 device numbersDevice function numbers 1 to 94, common suffixes and their IEC 61850 logical node, with search.IEEE C37.2IEC 61850-7-4Open the toolInverse-time curvesCalculator and log-log plot of the IEC 60255-151 and IEEE C37.112 curves, with the coordination margin.IEC 60255-151IEEE C37.112Open the toolRelay coordinationUp to six relays, reclosers and fuses on a log-log plot, with the IEEE C57.109 damage curve, inrush and the coordination margin of each pair.IEC 60255-151IEEE C57.109Open the toolCT burdenLead resistance, relay burden and comparison with the rated burden of the current transformer.IEC 61869-2IEEE C57.13Open the toolCT saturationRequired versus available voltage (5P/10P, PX or C class), time to saturation and the saturated waveform.IEC 61869-2IEEE C37.110Open the toolVector group compensation (87T)TAP of each winding, phase compensation matrix, zero-sequence removal and the HV-to-LV clock diagram.Open the toolPrimary and secondary impedance (21)Primary to secondary ohms with the CT and VT ratios, line Z1, Z0 and k0, and zone reaches on the R-X plane.Open the tool
Analysis and communications
Fault records, sequence components and IEC 61850 networks.
COMTRADE viewerOpen .cfg/.dat or .cff fault records in your browser: waveforms, digital channels, cursor and RMS. The file is not uploaded.IEEE C37.111IEC 60255-24Open the toolCOMTRADE generatorCreate a COMTRADE fault record (.cfg/.dat or .cff) for your test set: fault, DC offset and breaker opening.IEEE C37.111Open the toolIEC 61850 SCL viewerOpen .scd, .cid or .icd files in your browser: IEDs, GOOSE and SV addresses, datasets, subscribers and checks. The file is not uploaded.IEC 61850-6IEC 61850-8-1Open the toolSymmetrical componentsPhase quantities to zero, positive and negative sequence and back (Fortescue), with phasor diagrams and what they mean for 46, 67Q and 51N.IEC 60909-0Open the toolGOOSE and SV addressesCheck IEC 61850 multicast MAC, APPID, VLAN and priority, find duplicates and export the table as CSV.IEC 61850-8-1IEC 61850-9-2Open the toolTechnical glossarySubstation, protection and communications terms, explained in one or two sentences.Open the tool
Equipment testing and diagnostics
Correction and interpretation of test results on transformers, motors and bushings.
DGA interpretationIEEE C57.104-2019 DGA status, Duval triangles 1, 4 and 5, IEC 60599 ratios and CO₂/CO of your transformer.IEEE C57.104-2019IEC 60599Open the toolInsulation temperature correctionInsulation resistance at 40 °C (IEEE 43) or 20 °C, PI, DAR and power factor of transformers and bushings, with the trend.IEEE 43-2013ANSI/NETAOpen the tool
Studies and industry
Short circuit, power quality, cables, batteries and grounding.
Short-circuit currentQuick estimate of the three-phase fault at the secondary of a transformer.IEC 60909-0Open the toolPer-unit base conversionBase current and impedance, conversion between %, pu and ohms, and change of base for transformers, generators and lines.Open the toolHarmonic distortion THD and TDDVoltage THD and current TDD against the IEEE 519-2022 limits, with the spectrum as a bar chart.IEEE 519-2022Open the toolCapacitor bankkvar to correct the power factor, steps of the automatic bank, capacitance and resonance with the transformer.Open the toolCable voltage dropΔV and % with R and X per km, copper or aluminium, mm² or AWG/kcmil, and the short-circuit check of the cable size.Open the toolBattery sizingAh, number of cells and charger of a DC battery bank from its duty cycle, per IEEE 485 and IEEE 1115.IEEE 485IEEE 1115Open the toolGrounding resistanceGround rods, horizontal conductor and grid (BS 7430, IEEE 80), and soil resistivity from Wenner measurements.IEEE 80BS 7430Open the toolProcess bus networkSV and GOOSE bandwidth, worst-case latency, PRP, HSR or RSTP redundancy and PTP time error of an IEC 61850 network.Open the toolInterlocking table and CILO equationsInterlocking matrix per device, IEC 61850 EnaOpn and EnaCls equations, GOOSE signals between bays and FAT/SAT test cases per configuration.Open the tool
These tools are for estimates and quick reference. Protection settings and electrical studies are done with the full system model and the equipment documentation.
Need the settings loaded into the relay?
We configure relays and recloser controls of the main brands remotely: protection, control and communications. Tell us the make and model and we confirm availability.