Voltajyň düşmegi hasapçy
Uzynlyk, akymy we geçiriji ululykdan bir teliň içinde ýitiren woltajyny hasapla.
Netijeler ýazýan wagtyň täzelener.
Bu hasapçy hakda
Every conductor has some resistance, so a little voltage is always lost pushing current along a cable — that loss is the voltage drop. For a single-phase run the drop is Vdrop = 2 × ρ × L × I / A, where the factor 2 accounts for the current travelling out to the load and back along the return conductor; a three-phase run uses √3 instead of 2. Here ρ is the resistivity of the metal (copper ≈ 0.0175 Ω·mm²/m, aluminium ≈ 0.0282 Ω·mm²/m), L is the one-way length in metres, I the load current in amps and A the conductor cross-section in mm². This calculator also reports the resulting percentage drop, the voltage actually delivered at the load and the power wasted as heat in the cable (Ploss = Vdrop × I).
As a worked example, take 20 A flowing 50 m one-way through a 10 mm² copper cable on a 230 V single-phase supply: Vdrop = 2 × 0.0175 × 50 × 20 / 10 = 3.5 V, about 1.5%, so the load sees roughly 226.5 V and the cable wastes 3.5 × 20 = 70 W. Switch the conductor to aluminium and the same run drops about 5.6 V, because aluminium’s resistivity is around 60% higher. You can either type a custom cross-section or pick a standard AWG gauge from the advanced list, which overrides the area field with the gauge’s real mm² value.
Voltage drop matters because motors, lights and electronics misbehave when they are starved of voltage — dim lamps, sluggish motors and nuisance tripping all trace back to oversized drops on long runs. Electricians size cables so total drop stays within about 3% for branch circuits and 5% end-to-end; the result here flags whether your run meets the limit you set, and the fix for a failing run is a larger conductor, a shorter route or, occasionally, a higher supply voltage.
Köp soralýan soraglar
Voltajyň düşmegi nädip hasap edilýär?
Bir faza üçin, Vdrop = 2 × ρ × L × I / A. Faktor 2 çykýan we dolanan akymy üçin jogapkär; üç faza 2-niň ýerine √3 ulanýar.
Näme volt düşmesi kabul edilip bilner?
Bir umumy düzgüni, 3% aşak tutmak üçin 3% we 5% 5
Batyr ýa-da alumina - bu ähmiýetlimi?
Eý. Aluminaň bakırdan 60% ýokary rezistiwiteti bar, şonuň üçin bir alymunaň birmeňzeş ululykly bir çägi proporsionally has köp volty düşürýär.
Formul nämüçin iki gezek uzynlyky ulanýar?
Akymy ýükläp we dolap çykmak gerek, şonuň üçin bir fazy serişde iki konduktoryň düşmegini görýär - şundan 2 × uzunlyk faktory. Üç fazy serişdeler √3 (1.732 töweregi) ulanýar, üç fazy güýç balansy geometriýasyny görkezmek üçin.
Men nädip köp voltly düşmegi azaltaýyn?
Use a larger conductor (doubling the cross-section roughly halves the drop), shorten the run, split the load across parallel cables, or raise the supply voltage. Bigger copper is the usual fix because drop is inversely proportional to area.
Kabelde näçe güýç ýitýär?
Ýüklenen güýjüň öçürmesi akymyň düşmegi bilen deňdir, Ploss = Vdrop × I. 20 A-da 3.5 V düşmesi 70 W-y akyma gyzgynlyk hökmünde ýükretýär - energiýa üçin töleg edýäň, emma hiç wagt ulanmaýaň, şu sebäpden uzak ýokary akymyň işlemesi köp, az ýitgili kableleri haklaýar.
Men mm² meýdançanyň ýerine AWG ölçegleri ulanyp bilerinmi?
Eý. Öňki AWG sanawynda bir gaýury saýla we ol meýdança meýdanyny mm²-de o gaýuryň kesgitli kesimi bilen üste geçýär (meselem 10 AWG ≈ 5.26 mm²), şonuň üçin siz Günorta Amerikaly gurnaýjylar ulanan gaýury sistemasynda işlep bilersiňiz.
API — bu hasapçyny koddan ullan
Bu hasapçyny boş JSON ahtar noktasy hökmünde çagyr - açar gerek däl. Aşakdaky meýdança mykdarlaryny soragyň parametrleri ýa-da JSON hökmünde iber. Siziň goýmaýan hernäňiz şu sahypanyň öň bellenen öň bellenenini ulanýar; namydar parametr 400, hiç wagt sessiz sıfır däl. Eňlisçe senedleri oka →
Endpoint
GET https://calculator.free/api/v1/voltage-drop/curl
curl "https://calculator.free/api/v1/voltage-drop/?material=copper&length=50¤t=20&area=10&source=230"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/voltage-drop/?" + new URLSearchParams({
"material": "copper",
"length": "50",
"current": "20",
"area": "10",
"source": "230"
}));
const data = await r.json();
console.log(data.results);Netijeler diňe umumy ýardam üçin hasaplanypdyr, maliýe, saglyk ýa-da salgyt maslahaty üçin däl.