We perform transient and steady-state calculations for electrical installations of all voltage classes — short-circuit currents, relay protection, motor starting, arc flash and much more — modelled in ETAP and delivered as stamped, audit-ready reports.
Discuss your tasksAs Zimbabwe's captive-power directive turns every major plant into a micro-grid, ZETDC and lenders increasingly demand a single, verified electrical model behind every decision. We build that model once in ETAP and run the full suite of studies on it — so the load-flow, the short-circuit levels, the protection settings and the arc-flash labels all reconcile to one source of truth.
Tap any calculation below to see what it answers, the standard it follows, and exactly what you get. Mix and match — request as many as you need.
Voltage profiles, equipment loading and system losses across every bus.
Know exactly where your network is sagging before you commission anything.
A load-flow study calculates the voltage at every bus, the loading on every transformer and cable, and the real and reactive losses across the system, under the load scenarios that matter to you (peak, normal, minimum). It is the foundation every other study builds on.
Fault levels at every point — so switchgear is rated, not over-rated.
Specify breakers to the actual fault duty — and prove it on paper.
Short-circuit calculation per IEC 60909 determines the prospective fault current at every point in the network for three-phase, line-to-ground and other fault types. It sets the interrupting and withstand ratings your switchgear must meet, and feeds directly into protection and arc-flash work.
Time-current curves and relay settings that isolate faults without nuisance trips.
When a fault happens, the nearest device should clear it — not the main incomer.
Protection coordination produces the time-current characteristic (TCC) curves and relay settings that ensure selectivity: the device closest to a fault operates first, keeping the rest of the plant energised. We model this in the ETAP Star module and deliver settings ready to commission.
Incident-energy levels, PPE categories and approach boundaries at every panel.
Your electricians have a legal right to know the energy they're working in front of.
Arc-flash analysis per IEEE Std 1584 calculates the incident energy released in a fault at each piece of equipment, which dictates the personal protective equipment (PPE) category and the safe approach boundaries. The output is a set of warning labels and a study that stands up to a safety audit.
Voltage dip and acceleration checks for large MV and LV motors.
A mill that won't start on a weak feed is a production line that doesn't run.
Motor-starting studies model the voltage dip and acceleration time when large motors — SAG and ball mills, crushers, pumps, compressors — are energised, confirming they will start under your supply conditions and won't drag the bus voltage below what neighbouring equipment can tolerate.
Harmonic-distortion analysis and filter sizing per IEC 61000-4-30 / IEEE 519.
Drives, furnaces and rectifiers inject harmonics that quietly cook your transformers.
Power-quality and harmonic studies measure and model the distortion your non-linear loads push back into the supply, check it against the limits in IEEE Std 519, and size the mitigation — active filters, line reactors, K-rated transformers — needed to bring it within bounds.
OCP + OPF optimisation that lifts power factor and cuts losses.
The same kilowatts delivered with fewer losses is money straight back to the bottom line.
Using ETAP's Optimal Capacitor Placement (OCP) and Optimal Power Flow (OPF), we determine where to add reactive compensation and how to set transformer taps to raise power factor, flatten the voltage profile and reduce system losses. In our reference modelling this approach delivered a measured 9.7% loss reduction.
Generator stability and frequency-response checks for captive plants.
When the grid drops and your generators take the load, will they hold?
Transient and dynamic stability studies model how generators and the network respond to disturbances — faults, sudden load changes, loss of the utility supply — checking that machines stay in synchronism and frequency recovers within limits. Essential for any site islanding onto its own generation.
System reliability indices and redundancy assessment.
Quantify how often — and how long — each critical load could go dark.
Reliability analysis evaluates the probability and duration of supply interruption to critical loads, given your network topology and equipment failure rates. It justifies (or challenges) redundancy investment with numbers a board and a lender can weigh.
Station battery and UPS autonomy calculations.
The protection and control that has to work when everything else fails runs on DC.
DC-system studies size the station battery and charger, and verify UPS autonomy, so protection relays, control systems and critical loads ride through an outage for the required duration. We calculate the duty cycle, battery capacity and voltage-drop on the DC distribution.
CT sizing and knee-point verification for reliable protection.
A current transformer that saturates in a fault blinds the relay that depends on it.
CT saturation studies verify that your current transformers will reproduce fault current faithfully — without saturating — so the protection relays they feed operate correctly. We check knee-point voltage, burden and accuracy class against the protection scheme's requirements.
Step- and touch-potential analysis and grounding-grid design.
In a ground fault, a badly-earthed yard can put a lethal voltage under someone's feet.
Grounding studies per IEEE Std 80 design the earthing grid and verify step- and touch-potentials stay within safe limits during a ground fault, accounting for local soil resistivity — important on the karst and variable terrain found across Zimbabwean industrial sites.
We don't build a fresh spreadsheet for each calculation. We build your network once in the ETAP power-systems platform — buses, transformers, cables, machines, protection — verify it against site data, then run the full suite of studies on that single model. Results reconcile, because they share one source of truth.
Reports are issued in English, in your template or ours, and can be exported in ETAP, PDF, DWG and other formats.
A clear four-stage process, agreed before any work starts, so you know exactly what you're getting and when.
We discuss the technical specification and project details so the scope is clear and agreed before the contract is signed.
We collect and verify the input data — equipment parameters from nameplates, drawings or site measurement — at the project's stage of readiness.
For each study we agree the list of network configurations, operating modes and conditions to be calculated, and run them.
We prepare and issue the report (English, your template or ours) and can hand over the model with its equipment library in ETAP, PDF, DWG and more.
This calculation suite is built on the founder's Master's dissertation (with distinction): a 118-page, ETAP-based study of an industrial power system. Three case studies form its backbone — and they map directly onto the services above.
A 13-bus network modelled across peak, normal and minimum load scenarios — surfacing a bus under-voltage at 87.07% and a transformer loaded to 289.9%.
Capacitor banks and transformer tap optimisation (OCP + OPF) applied to the same model to lift power factor and cut system losses.
Differential and overcurrent relays coordinated with full time-current characteristic plots in the ETAP Star module.
Every study is written so anyone — your team, a regulator, or a bank's engineer — can follow the reasoning and check the result. No black boxes.
Send a single-line diagram and a recent ZETDC bill, and we'll come back with a scoped proposal — which calculations you need, what they'll show, and what they'll cost.