Calculations that come up on site, in the browser.
Small, focused calculators for the arithmetic that gets done on the back of a work pack — free, no sign-up, and no data leaves your browser. Every tool states the method it uses, the assumptions behind it and where it stops being valid, because a calculator that doesn't show its working is not one you should make a decision with.
A reading taken on a cold morning is not comparable with a rated filling pressure quoted at 20 °C until it has been corrected.
Corrects sealed-enclosure gas pressure between any two temperatures, in either direction. Absolute or gauge input with adjustable atmospheric pressure, in bar, MPa, kPa or psi, with a live plot and a printable table across the −40 to +60 °C range. Valid for dry air, nitrogen, oxygen and carbon dioxide up to about 10 bar absolute; not for SF6 at service density.
Pressure–temperature correction at circuit breaker filling density using a real-gas relation, together with the saturation curve — so a filling pressure can be checked against the lowest ambient temperature it will tolerate before liquefaction begins. Being built against manufacturer density curves.
Partial pressures and filling sequence for SF6/N2 and SF6/CF4 mixtures at a target ratio and total pressure, with the resulting liquefaction temperature for the mixture.
More tools are being added. If there is a calculation you find yourself doing on paper in the field, tell us — that is where this list comes from.
HVPACE is the trading name of Power Asset Condition Engineering Limited, a New Zealand-based supplier of test and diagnostic instruments and selected specialty equipment — such as cable sheath voltage limiters and other low-volume, mission-critical components — for high-voltage power systems. Backed by hands-on engineering expertise, including field-tested condition assessment techniques and AI-based signal analysis, we support customers with diagnostic guidance, methodology development and fault investigation.
These tools are free to use and free to share. They are provided for reference and cross-checking, and do not replace equipment manufacturers' data, nameplate values or operating instructions.
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