Trefas effektkalkylator \u2013 P, Q, S & cos \u03c6 | HINTEK Power Solutions AB<\/title>\n <meta name=\"description\" content=\"Gratis trefas-kalkylator fr\u00e5n HINTEK Power Solutions AB. R\u00e4kna P, Q, S och cos \u03c6 och se effekttriangeln visuellt.\">\n <meta name=\"author\" content=\"HINTEK Power Solutions AB\">\n <meta name=\"robots\" content=\"index,follow\">\n <link rel=\"canonical\" href=\"https:\/\/hintek.se\/index.php\/effektformel-3-fas\/\">\n <link rel=\"preconnect\" href=\"https:\/\/cdn.jsdelivr.net\" crossorigin>\n\n <meta property=\"og:type\" content=\"website\">\n <meta property=\"og:locale\" content=\"sv_SE\">\n <meta property=\"og:title\" content=\"Trefas effektkalkylator \u2013 P, Q, S & cos \u03c6\">\n <meta property=\"og:description\" content=\"Gratis trefas-kalkylator fr\u00e5n HINTEK Power Solutions AB. R\u00e4kna P, Q, S och cos \u03c6 och se effekttriangeln.\">\n <meta property=\"og:site_name\" content=\"HINTEK Power Solutions AB\">\n <meta property=\"og:url\" content=\"https:\/\/hintek.se\/index.php\/effektformel-3-fas\/\">\n <meta name=\"twitter:card\" content=\"summary\">\n \n <script>\n window.MathJax = {\n tex: { inlineMath: [['$', '$'], ['\\\$', '\\\$']] },\n chtml: { matchFontHeight: false }\n };\n <\/script>\n <script src=\"https:\/\/cdn.jsdelivr.net\/npm\/mathjax@3\/es5\/tex-mml-chtml.js\" defer><\/script>\n <style>\n #power-calculation-widget { font-family: Arial, sans-serif; margin: 20px; background:#ffffff; color:#333; }\n #power-calculation-widget h1, #power-calculation-widget h3 { text-align:center; margin-top:0; }\n #power-calculation-widget .container {\n max-width: 600px; margin: 0 auto; background:#ffffff; border-radius:8px;\n box-shadow:0 0 10px rgba(0,0,0,.1); padding:20px;\n }\n #power-calculation-widget label { display:block; margin:10px 0 5px; font-weight:bold; }\n #power-calculation-widget input, #power-calculation-widget select {\n width: calc(100% - 20px); padding:8px 10px; font-size:16px; margin-bottom:15px;\n border:1px solid #ccc; border-radius:4px; height:44px; box-sizing:border-box;\n }\n #power-calculation-widget .results {\n margin-top:20px; background:#ffffff; border:1px solid #c3e6cb; border-radius:4px;\n padding:10px; font-size:16px; line-height:1.6;\n }\n #formulaBox { position: relative; height: 110px; overflow: hidden; }\n #formulaBox .formula { position:absolute; left:0; right:0; top:50%; transform:translateY(-50%); text-align:center; }\n #formulaBox .mjx-chtml { line-height: 1; }\n #result { min-height: 72px; }\n #triangleSection { margin-top:20px; border:1px solid #c3e6cb; border-radius:4px; padding:10px; }\n #triangleSvg { width:100%; height:420px; }\n #triangleSvg svg { width:100%; height:100%; } #triangleInfo { margin-top:8px; font-size:14px; line-height:1.4; }\n #phiBelow { font-size:14px; }\n #triangleSvg text { font-size:12px !important; }\n <\/style>\n<script type=\"application\/ld+json\">\n {\n \"@context\": \"https:\/\/schema.org\",\n \"@type\": \"WebApplication\",\n \"name\": \"Trefas effektkalkylator\",\n \"applicationCategory\": \"Calculator\",\n \"operatingSystem\": \"Web\",\n \"inLanguage\": \"sv\",\n \"url\": \"https:\/\/hintek.se\/index.php\/effektformel-3-fas\/\",\n \"description\": \"Interaktiv trefas-kalkylator f\u00f6r P, Q, S och cos \u03c6 med effekttriangel.\",\n \"provider\": {\"@type\":\"Organization\",\"name\":\"HINTEK Power Solutions AB\"},\n \"offers\": {\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"SEK\"}\n }\n<\/script>\n<\/head>\n<body>\n<div id=\"power-calculation-widget\">\n <div class=\"container\">\n <h3>Effektformel \u2013 3-fas<\/h3>\n\n <div id=\"formulaBox\" class=\"results\">\n <div id=\"formulaP\" class=\"formula\">$$P = U \\cdot I \\cdot \\cos(\\varphi) \\cdot \\sqrt{3}$$<\/div>\n <div id=\"formulaI\" class=\"formula\" style=\"display:none;\">$$I = \\frac{P}{U \\cdot \\cos(\\varphi) \\cdot \\sqrt{3}}$$<\/div>\n <\/div>\n\n <form id=\"powerForm\" onsubmit=\"return false;\">\n <label for=\"solveFor\">Ber\u00e4kna:<\/label>\n <select id=\"solveFor\">\n <option value=\"P\">P (effekt)<\/option>\n <option value=\"I\">I (str\u00f6m)<\/option>\n <\/select>\n\n <label for=\"voltage\">Sp\u00e4nning (U) i Volt:<\/label>\n <input type=\"number\" id=\"voltage\" placeholder=\"Ex: 400\" step=\"any\" min=\"0\"\/>\n\n <label for=\"current\">Str\u00f6m (I) i Ampere:<\/label>\n <input type=\"number\" id=\"current\" placeholder=\"Ex: 10\" step=\"any\" min=\"0\"\/>\n\n <label for=\"cosPhi\">Effektfaktor (cos \u03c6):<\/label>\n <input type=\"number\" id=\"cosPhi\" placeholder=\"Ex: 0,85\" step=\"0.01\" min=\"0\" max=\"1\" \/>\n\n <label for=\"power\">Effekt (P) i Watt:<\/label>\n <input type=\"number\" id=\"power\" placeholder=\"Ex: 5000\" step=\"any\" min=\"0\" \/>\n <\/form>\n\n <div id=\"result\" class=\"results\" style=\"display:none;\"><\/div>\n\n <div id=\"triangleSection\" style=\"display:none;\">\n <strong>Effekttriangel<\/strong>\n <div id=\"triangleSvg\"><\/div>\n <div id=\"triangleInfo\"><\/div>\n <\/div>\n\n \n <div id=\"explanation\" class=\"results\" style=\"margin-top: 20px;\">\n <strong>F\u00f6rklaring av effekt och effektfaktor<\/strong>\n <p>Aktiv effekt (P) \u00e4r den verkliga effekten som omvandlas till nyttigt arbete eller v\u00e4rme i lasten. Den m\u00e4ts i watt (W) och anges ofta i kilowatt (kW).<\/p>\n <p>Skenbar effekt (S) \u00e4r den totala effekten i ett trefassystem och best\u00e5r av den aktiva plus den reaktiva effekten. Den m\u00e4ts i voltampere (VA) och anges ofta i kilovoltampere (kVA). F\u00f6r trefas g\u00e4ller <em>S = \u221a3\u00b7U\u00b7I<\/em>.<\/p>\n <p>Reaktiv effekt (Q) \u00e4r den del av effekten vars energi <em>pendlar<\/em> mellan k\u00e4llan (generatorn\/n\u00e4tet) och lasten \u2013 fram och tillbaka varje n\u00e4tperiod \u2013 p\u00e5 grund av energilagring i magnetiska och elektriska f\u00e4lt (induktiva\/kapacitiva komponenter). Den bidrar inte till nyttigt arbete i lasten men beh\u00f6vs t.ex. f\u00f6r magnetisering. Den m\u00e4ts i var och anges ofta i kilovar (kvar).<\/p>\n <p>Effektfaktor, eller cos \u03c6, \u00e4r f\u00f6rh\u00e5llandet mellan aktiv och skenbar effekt: <em>cos \u03c6 = P\/S<\/em>.<\/p>\n <\/div>\n\n <div id=\"footnote\" class=\"results\" style=\"margin-top:20px;font-size:12px;text-align:center;\"><\/div>\n <\/div>\n<\/div>\n\n<script>\n(() => {\n const $ = id => document.getElementById(id);\n const SQRT3 = Math.sqrt(3);\n const nf2 = new Intl.NumberFormat('sv-SE', { maximumFractionDigits: 2 });\n\n \/\/ DOM\n const solveForEl = $(\"solveFor\");\n const voltageEl = $(\"voltage\");\n const currentEl = $(\"current\");\n const cosPhiEl = $(\"cosPhi\");\n const powerEl = $(\"power\");\n const resultEl = $(\"result\");\n const formulaPEl = $(\"formulaP\");\n const formulaIEl = $(\"formulaI\");\n const triangleSectionEl = $(\"triangleSection\");\n const triangleSvgEl = $(\"triangleSvg\");\n const triangleInfoEl = $(\"triangleInfo\");\n const footnoteEl = $(\"footnote\");\n\n \/\/ MathJax typeset\n function ensureTypeset() {\n if (!window.MathJax || !MathJax.typesetPromise) return;\n const pending = [];\n if (!formulaPEl.dataset.typeset) pending.push(formulaPEl);\n if (!formulaIEl.dataset.typeset) pending.push(formulaIEl);\n if (pending.length) {\n MathJax.typesetPromise(pending).then(() => pending.forEach(el => el.dataset.typeset = \"1\"));\n }\n }\n\n function updateFormulaVisibility() {\n if (solveForEl.value === 'P') {\n formulaPEl.style.display = 'block';\n formulaIEl.style.display = 'none';\n powerEl.setAttribute('readonly', 'readonly');\n currentEl.removeAttribute('readonly');\n } else {\n formulaPEl.style.display = 'none';\n formulaIEl.style.display = 'block';\n powerEl.removeAttribute('readonly');\n currentEl.setAttribute('readonly', 'readonly');\n }\n }\n\n \/\/ Parse helpers\n function parseVal(el) {\n const raw = String(el.value || '').trim().replace(\/\\s+\/g, '').replace(\/,\/g, '.');\n if (!raw) return NaN;\n const v = parseFloat(raw);\n return Number.isFinite(v) ? v : NaN;\n }\n\n function formatVal(num) {\n if (!Number.isFinite(num)) return '';\n return num.toFixed(2).replace('.', ',');\n }\n\n let internalUpdate = false;\n function setFieldValue(el, num) {\n let val = '';\n if (Number.isFinite(num)) {\n if (el.type === 'number') {\n \/\/ number-input kr\u00e4ver punkt som decimal\n val = num.toFixed(2);\n } else {\n \/\/ text-input kan visa svensk komma\n val = num.toFixed(2).replace('.', ',');\n }\n }\n if (el && el.value !== val) {\n internalUpdate = true;\n el.value = val;\n internalUpdate = false;\n }\n }\n\n function showResult(html) {\n resultEl.innerHTML = html;\n resultEl.style.display = 'block';\n }\n function hideResult() {\n resultEl.style.display = 'none';\n resultEl.innerHTML = '';\n }\n\n function updateTriangle(U, I, cos, PIn) {\n let Pcalc = NaN;\n let S = NaN;\n\n if (solveForEl.value === 'P') {\n if (Number.isFinite(U) && Number.isFinite(I)) Pcalc = U * I * cos * SQRT3;\n } else {\n Pcalc = Number.isFinite(PIn) ? PIn : NaN;\n }\n\n if (Number.isFinite(U) && Number.isFinite(I)) {\n S = SQRT3 * U * I;\n } else if (Number.isFinite(Pcalc) && Number.isFinite(cos) && cos > 0) {\n S = Pcalc \/ cos;\n }\n\n if (!Number.isFinite(Pcalc) || !Number.isFinite(S) || S <= 0) {\n triangleSectionEl.style.display = 'none';\n triangleSvgEl.innerHTML = '';\n triangleInfoEl.innerHTML = '';\n return;\n }\n\n const Q = Math.sqrt(Math.max(0, S*S - Pcalc*Pcalc));\n\n const Pk = Pcalc\/1000, Qk = Q\/1000, Sk = S\/1000;\n const rawMax = Math.max(Pk, Qk, Sk);\n const maxVal = rawMax * 1.03;\n\n const width = triangleSvgEl.clientWidth || triangleSvgEl.offsetWidth || 400;\n const height = triangleSvgEl.clientHeight || triangleSvgEl.offsetHeight || 300;\n\n const margin = 12;\n \/\/ Nu n\u00e4r Q-etiketten ligger till h\u00f6ger beh\u00f6vs ingen extra v\u00e4nsterbuffert\n const leftMargin = margin, rightMargin = margin, topMargin = margin, bottomMargin = margin + 28; \/\/ extra utrymme f\u00f6r P-etiketten under axeln\n\n const availW = width - leftMargin - rightMargin;\n const availH = height - topMargin - bottomMargin;\n const scale = Math.min(availW, availH) \/ (maxVal === 0 ? 1 : maxVal);\n\n const originX = leftMargin + (availW - (maxVal * scale)) \/ 2;\n const originY = height - bottomMargin;\n\n const pxEnd = originX + Pk*scale;\n const pyEnd = originY;\n const qxEnd = pxEnd;\n const qyEnd = originY - Qk*scale;\n \/\/ Q-benet ska alltid n\u00e5 ner till P (x-axeln)\n const qBottomY = originY;\n\n const sEndX = originX + Pk*scale;\n const sEndY = originY - Qk*scale;\n\n const r = Sk * scale;\n\n \/\/ Axlar ska m\u00f6ta cirkeln (inte hela ritytans kant)\n const axisXEnd = originX + r;\n const axisYEnd = originY - r;\n\n let svg = `<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 ${width} ${height}\" preserveAspectRatio=\"xMidYMid meet\">`;\n\n svg += `<path d=\"M ${originX} ${originY - r} A ${r} ${r} 0 0 1 ${originX + r} ${originY}\" fill=\"none\" stroke=\"#ccc\" stroke-width=\"1\"\/>`;\n\n const gridLines = 4;\n for (let i=1;i<=gridLines;i++){\n const gx = originX + (maxVal*scale\/gridLines)*i;\n const gy = originY - (maxVal*scale\/gridLines)*i;\n svg += `<line x1=\"${gx}\" y1=\"${originY}\" x2=\"${gx}\" y2=\"${originY - maxVal*scale}\" stroke=\"#eee\" stroke-width=\"1\"\/>`;\n svg += `<line x1=\"${originX}\" y1=\"${gy}\" x2=\"${originX + maxVal*scale}\" y2=\"${gy}\" stroke=\"#eee\" stroke-width=\"1\"\/>`;\n }\n\n svg += `<defs><marker id=\"arrow\" markerWidth=\"7\" markerHeight=\"7\" refX=\"6\" refY=\"3.5\" orient=\"auto\"><path d=\"M0,0 L7,3.5 L0,7 z\" fill=\"#666\"><\/path><\/marker><\/defs>`;\n\n svg += `<line x1=\"${originX}\" y1=\"${originY}\" x2=\"${pxEnd}\" y2=\"${pyEnd}\" stroke=\"#007bff\" stroke-width=\"2\"\/>`;\n svg += `<line x1=\"${pxEnd}\" y1=\"${qBottomY}\" x2=\"${pxEnd}\" y2=\"${qyEnd}\" stroke=\"#ffa500\" stroke-width=\"2\"\/>`;\n svg += `<line x1=\"${originX}\" y1=\"${originY}\" x2=\"${sEndX}\" y2=\"${sEndY}\" stroke=\"#28a745\" stroke-width=\"2\"\/>`;\n\n svg += `<line x1=\"${originX}\" y1=\"${originY}\" x2=\"${axisXEnd}\" y2=\"${originY}\" stroke=\"#666\" stroke-width=\"1\" marker-end=\"url(#arrow)\"\/>`;\n svg += `<line x1=\"${originX}\" y1=\"${originY}\" x2=\"${originX}\" y2=\"${axisYEnd}\" stroke=\"#666\" stroke-width=\"1\" marker-end=\"url(#arrow)\"\/>`;\n\n \n const phiRadLabel = Math.acos(Math.min(Math.max(Pcalc \/ S, -1), 1));\n const phiDegLabel = phiRadLabel * 180 \/ Math.PI;\n const phiLabelX = Math.max(leftMargin + 4, originX - 8);\n const phiLabelY = originY - 1; \/\/ tidigare -6, flyttad ned 5 px\n svg += `<text x=\"${phiLabelX}\" y=\"${phiLabelY}\" font-size=\"12\" text-anchor=\"end\" dominant-baseline=\"baseline\" fill=\"#444\">\u03c6 \u2248 ${nf2.format(phiDegLabel)}\u00b0<\/text>`;\n\n \/\/ s\u00e5 den aldrig beh\u00f6ver flyttas \u00e5t v\u00e4nster n\u00e4r cos\u03c6 \u2192 1\n const maxX = originX + maxVal * scale;\n const qLabelX = Math.min(pxEnd + 25, maxX - 6);\n \/\/ men s\u00e4kerst\u00e4ll att den aldrig ligger p\u00e5 x-axeln\n let qLabelY = (originY + qyEnd) \/ 2;\n qLabelY = Math.min(qLabelY, originY - 12);\n\n svg += `<text x=\"${originX + (pxEnd - originX)\/2}\" y=\"${originY + 18}\" font-size=\"12\" text-anchor=\"middle\" dominant-baseline=\"hanging\" fill=\"#007bff\">P \u2248 ${nf2.format(Pk)} kW<\/text>`;\n svg += `<text x=\"${qLabelX}\" y=\"${qLabelY}\" font-size=\"12\" text-anchor=\"start\" dominant-baseline=\"middle\" fill=\"#ffa500\">Q \u2248 ${nf2.format(Qk)} kvar<\/text>`;\n\n const dxS = sEndX - originX;\n const dyS = sEndY - originY;\n\n const baseSX = originX + dxS * 0.5;\n const baseSY = originY + dyS * 0.5;\n\n const lenS = Math.hypot(dxS, dyS) || 1;\n let nX = dyS \/ lenS; \/\/ < 0 n\u00e4r S lutar upp\u00e5t \u2192 v\u00e4nster\n let nY = -dxS \/ lenS; \/\/ \u2264 0 \u2192 upp\u00e5t eller rakt \u00e5t v\u00e4nster\n if (nY > 0) { nX = -nX; nY = -nY; }\n\n let sOffset = 24 + r * 0.07 + (1 - Math.min(Math.max(cos, 0), 1)) * 24; \/\/ 24..~64 px\n sOffset = Math.max(18, Math.min(64, sOffset));\n\n let sLabelX = baseSX + nX * sOffset;\n let sLabelY = baseSY + nY * sOffset;\n\n const minXc = leftMargin + 2, maxXc = originX + maxVal*scale - 6;\n const minYc = originY - maxVal*scale + 6, maxYc = originY - 6;\n sLabelX = Math.max(minXc, Math.min(maxXc, sLabelX));\n sLabelY = Math.max(minYc, Math.min(maxYc, sLabelY));\n\n svg += `<text x=\"${sLabelX}\" y=\"${sLabelY}\" font-size=\"12\" text-anchor=\"middle\" dominant-baseline=\"middle\" fill=\"#28a745\">S \u2248 ${nf2.format(Sk)} kVA<\/text>`;\n\n svg += `<\/svg>`;\n triangleSvgEl.innerHTML = svg;\n\n const phiRad = Math.acos(Math.min(Math.max(Pcalc \/ S, -1), 1));\n const phiDeg = phiRad * 180\/Math.PI;\n const infoHTML =\n `\u03c6 = cos\u207b\u00b9(${nf2.format(Pcalc)} \/ ${nf2.format(S)}) \u2248 ${nf2.format(phiDeg)}\u00b0` +\n `<br>P = ${nf2.format(Pcalc)} W (${nf2.format(Pcalc\/1000)} kW)` +\n `<br>Q = ${nf2.format(Q)} var (${nf2.format(Q\/1000)} kvar)` +\n `<br>S = ${nf2.format(S)} VA (${nf2.format(S\/1000)} kVA)`;\n\n triangleInfoEl.innerHTML = '';\n\n let phiBelow = document.getElementById('phiBelow');\n if (!phiBelow) {\n phiBelow = document.createElement('div');\n phiBelow.id = 'phiBelow';\n phiBelow.style.marginTop = '6px';\n resultEl.appendChild(phiBelow);\n }\n phiBelow.innerHTML = infoHTML;\n\n triangleSectionEl.style.display = 'block';\n }\n\n function calculate() {\n if (internalUpdate) return;\n const mode = solveForEl.value;\n const U = parseVal(voltageEl);\n const I = parseVal(currentEl);\n const cosRaw = String(cosPhiEl.value || '').trim().replace(\/\\s+\/g, '').replace(\/,\/g, '.');\n const cosParsed = parseFloat(cosRaw);\n const cosIsTransitional = (cosRaw === '.' || cosRaw === '');\n const cosVal = Number.isFinite(cosParsed) ? cosParsed : (cosIsTransitional ? 0 : NaN);\n const Pval = parseVal(powerEl);\n\n if ((!Number.isFinite(cosParsed) && !cosIsTransitional) || cosVal < 0 || cosVal > 1) {\n hideResult();\n triangleSectionEl.style.display = 'none';\n const phiBelow = document.getElementById('phiBelow');\n if (phiBelow) phiBelow.innerHTML = '';\n return;\n }\n\n let value;\n if (mode === 'P') {\n if (!Number.isFinite(U) || !Number.isFinite(I)) {\n hideResult();\n triangleSectionEl.style.display = 'none';\n return;\n }\n value = U * I * cosVal * SQRT3;\n setFieldValue(powerEl, value);\n showResult(`Resultat:<br><strong>${nf2.format(value)} W<\/strong> (${nf2.format(value\/1000)} kW)<br><small>U=${nf2.format(U)} V, I=${nf2.format(I)} A<\/small>`);\n updateTriangle(U, I, cosVal, NaN);\n } else {\n if (!Number.isFinite(Pval) || !Number.isFinite(U) || U <= 0 ) {\n hideResult();\n triangleSectionEl.style.display = 'none';\n return;\n }\n if (!(cosVal > 0)) {\n showResult(`Resultat:<br><small>P=${nf2.format(Pval)} W, U=${nf2.format(U)} V<\/small>`);\n triangleSectionEl.style.display = 'none';\n const pb = document.getElementById('phiBelow'); if (pb) pb.innerHTML = '';\n return;\n }\n value = Pval \/ (U * cosVal * SQRT3);\n setFieldValue(currentEl, value);\n showResult(`Resultat:<br><strong>${nf2.format(value)} A<\/strong><br><small>P=${nf2.format(Pval)} W, U=${nf2.format(U)} V<\/small>`);\n updateTriangle(U, value, cosVal, Pval);\n }\n }\n\n [voltageEl, currentEl, cosPhiEl, powerEl].forEach(el => {\n el.addEventListener('input', () => {\n if (internalUpdate) return;\n if ((el === cosPhiEl || el === powerEl) && el.value.includes(',')) {\n internalUpdate = true; el.value = el.value.replace(\/,\/g,'.'); internalUpdate = false;\n }\n calculate();\n });\n el.addEventListener('blur', () => {\n if ((el.value||'').includes(',')) {\n internalUpdate = true; el.value = el.value.replace(\/,\/g,'.'); internalUpdate = false;\n }\n });\n });\n\n solveForEl.addEventListener('change', () => { updateFormulaVisibility(); ensureTypeset(); calculate(); });\n\n updateFormulaVisibility();\n ensureTypeset();\n calculate();\n if (window.requestAnimationFrame) requestAnimationFrame(calculate);\n if (window.ResizeObserver) { new ResizeObserver(() => calculate()).observe(triangleSvgEl); }\n window.addEventListener('resize', calculate);\n\n (function manageVersion() {\n const today = new Date().toISOString().split('T')[0];\n const key = 'ef3f_version';\n const base = '1.2.0';\n try {\n const stored = localStorage.getItem(key);\n let vStr = base;\n let storedDate = '';\n if (stored) {\n const partsStored = stored.split('::');\n if (partsStored[0]) vStr = partsStored[0];\n if (partsStored[1]) storedDate = partsStored[1];\n }\n \/\/ Bump patch om datumet \u00e4ndrats eller inget lagrat finns\n if (!stored || storedDate !== today) {\n const parts = vStr.split('.').map(x => parseInt(x, 10));\n parts[2] = (parts[2] || 0) + 1;\n vStr = `${parts.join('.')}`;\n localStorage.setItem(key, `${vStr}::${today}`);\n }\n footnoteEl.textContent = `Genererat med ChatGPT (GPT-5 Thinking) \u2022 v${vStr} \u2014 ${today} \u2022 formler verifierade`;\n } catch (e) {\n footnoteEl.textContent = `Genererat med ChatGPT (GPT-5 Thinking) \u2022 v${base}`;\n }\n })();\n})();\n<\/script>\n<\/body>\n<\/html>\n\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trefas effektkalkylator \u2013 P, Q, S & cos \u03c6 | HINTEK Power Solutions AB Effektformel \u2013 3-fas $$P = U […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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{"id":798,"date":"2024-11-27T18:20:08","date_gmt":"2024-11-27T18:20:08","guid":{"rendered":"https:\/\/hintek.se\/?page_id=798"},"modified":"2025-08-18T19:11:22","modified_gmt":"2025-08-18T19:11:22","slug":"effektformel-3-fas","status":"publish","type":"page","link":"https:\/\/hintek.se\/index.php\/effektformel-3-fas\/","title":{"rendered":"Effektformel \u2013 3-fas"},"content":{"rendered":"\n\n\n\n\n \n \n Trefas effektkalkylator \u2013 P, Q, S & cos \u03c6 | HINTEK Power Solutions AB<\/title>\n <meta name=\"description\" content=\"Gratis trefas-kalkylator fr\u00e5n HINTEK Power Solutions AB. R\u00e4kna P, Q, S och cos \u03c6 och se effekttriangeln visuellt.\">\n <meta name=\"author\" content=\"HINTEK Power Solutions AB\">\n <meta name=\"robots\" content=\"index,follow\">\n <link rel=\"canonical\" href=\"https:\/\/hintek.se\/index.php\/effektformel-3-fas\/\">\n <link rel=\"preconnect\" href=\"https:\/\/cdn.jsdelivr.net\" crossorigin>\n\n <meta property=\"og:type\" content=\"website\">\n <meta property=\"og:locale\" content=\"sv_SE\">\n <meta property=\"og:title\" content=\"Trefas effektkalkylator \u2013 P, Q, S & cos \u03c6\">\n <meta property=\"og:description\" content=\"Gratis trefas-kalkylator fr\u00e5n HINTEK Power Solutions AB. R\u00e4kna P, Q, S och cos \u03c6 och se effekttriangeln.\">\n <meta property=\"og:site_name\" content=\"HINTEK Power Solutions AB\">\n <meta property=\"og:url\" content=\"https:\/\/hintek.se\/index.php\/effektformel-3-fas\/\">\n <meta name=\"twitter:card\" content=\"summary\">\n \n <script>\n window.MathJax = {\n tex: { inlineMath: [['$', '$'], ['\\\$', '\\\$']] },\n chtml: { matchFontHeight: false }\n };\n <\/script>\n <script src=\"https:\/\/cdn.jsdelivr.net\/npm\/mathjax@3\/es5\/tex-mml-chtml.js\" defer><\/script>\n <style>\n #power-calculation-widget { font-family: Arial, sans-serif; margin: 20px; background:#ffffff; color:#333; }\n #power-calculation-widget h1, #power-calculation-widget h3 { text-align:center; margin-top:0; }\n #power-calculation-widget .container {\n max-width: 600px; margin: 0 auto; background:#ffffff; border-radius:8px;\n box-shadow:0 0 10px rgba(0,0,0,.1); padding:20px;\n }\n #power-calculation-widget label { display:block; margin:10px 0 5px; font-weight:bold; }\n #power-calculation-widget input, #power-calculation-widget select {\n width: calc(100% - 20px); padding:8px 10px; font-size:16px; margin-bottom:15px;\n border:1px solid #ccc; border-radius:4px; height:44px; box-sizing:border-box;\n }\n #power-calculation-widget .results {\n margin-top:20px; background:#ffffff; border:1px solid #c3e6cb; border-radius:4px;\n padding:10px; font-size:16px; line-height:1.6;\n }\n #formulaBox { position: relative; height: 110px; overflow: hidden; }\n #formulaBox .formula { position:absolute; left:0; right:0; top:50%; transform:translateY(-50%); text-align:center; }\n #formulaBox .mjx-chtml { line-height: 1; }\n #result { min-height: 72px; }\n #triangleSection { margin-top:20px; border:1px solid #c3e6cb; border-radius:4px; padding:10px; }\n #triangleSvg { width:100%; height:420px; }\n #triangleSvg svg { width:100%; height:100%; } #triangleInfo { margin-top:8px; font-size:14px; line-height:1.4; }\n #phiBelow { font-size:14px; }\n #triangleSvg text { font-size:12px !important; }\n <\/style>\n<script type=\"application\/ld+json\">\n {\n \"@context\": \"https:\/\/schema.org\",\n \"@type\": \"WebApplication\",\n \"name\": \"Trefas effektkalkylator\",\n \"applicationCategory\": \"Calculator\",\n \"operatingSystem\": \"Web\",\n \"inLanguage\": \"sv\",\n \"url\": \"https:\/\/hintek.se\/index.php\/effektformel-3-fas\/\",\n \"description\": \"Interaktiv trefas-kalkylator f\u00f6r P, Q, S och cos \u03c6 med effekttriangel.\",\n \"provider\": {\"@type\":\"Organization\",\"name\":\"HINTEK Power Solutions AB\"},\n \"offers\": {\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"SEK\"}\n }\n<\/script>\n<\/head>\n<body>\n<div id=\"power-calculation-widget\">\n <div class=\"container\">\n <h3>Effektformel \u2013 3-fas<\/h3>\n\n <div id=\"formulaBox\" class=\"results\">\n <div id=\"formulaP\" class=\"formula\">$$P = U \\cdot I \\cdot \\cos(\\varphi) \\cdot \\sqrt{3}$$<\/div>\n <div id=\"formulaI\" class=\"formula\" style=\"display:none;\">$$I = \\frac{P}{U \\cdot \\cos(\\varphi) \\cdot \\sqrt{3}}$$<\/div>\n <\/div>\n\n <form id=\"powerForm\" onsubmit=\"return false;\">\n <label for=\"solveFor\">Ber\u00e4kna:<\/label>\n <select id=\"solveFor\">\n <option value=\"P\">P (effekt)<\/option>\n <option value=\"I\">I (str\u00f6m)<\/option>\n <\/select>\n\n <label for=\"voltage\">Sp\u00e4nning (U) i Volt:<\/label>\n <input type=\"number\" id=\"voltage\" placeholder=\"Ex: 400\" step=\"any\" min=\"0\"\/>\n\n <label for=\"current\">Str\u00f6m (I) i Ampere:<\/label>\n <input type=\"number\" id=\"current\" placeholder=\"Ex: 10\" step=\"any\" min=\"0\"\/>\n\n <label for=\"cosPhi\">Effektfaktor (cos \u03c6):<\/label>\n <input type=\"number\" id=\"cosPhi\" placeholder=\"Ex: 0,85\" step=\"0.01\" min=\"0\" max=\"1\" \/>\n\n <label for=\"power\">Effekt (P) i Watt:<\/label>\n <input type=\"number\" id=\"power\" placeholder=\"Ex: 5000\" step=\"any\" min=\"0\" \/>\n <\/form>\n\n <div id=\"result\" class=\"results\" style=\"display:none;\"><\/div>\n\n <div id=\"triangleSection\" style=\"display:none;\">\n <strong>Effekttriangel<\/strong>\n <div id=\"triangleSvg\"><\/div>\n <div id=\"triangleInfo\"><\/div>\n <\/div>\n\n \n <div id=\"explanation\" class=\"results\" style=\"margin-top: 20px;\">\n <strong>F\u00f6rklaring av effekt och effektfaktor<\/strong>\n <p>Aktiv effekt (P) \u00e4r den verkliga effekten som omvandlas till nyttigt arbete eller v\u00e4rme i lasten. Den m\u00e4ts i watt (W) och anges ofta i kilowatt (kW).<\/p>\n <p>Skenbar effekt (S) \u00e4r den totala effekten i ett trefassystem och best\u00e5r av den aktiva plus den reaktiva effekten. Den m\u00e4ts i voltampere (VA) och anges ofta i kilovoltampere (kVA). F\u00f6r trefas g\u00e4ller <em>S = \u221a3\u00b7U\u00b7I<\/em>.<\/p>\n <p>Reaktiv effekt (Q) \u00e4r den del av effekten vars energi <em>pendlar<\/em> mellan k\u00e4llan (generatorn\/n\u00e4tet) och lasten \u2013 fram och tillbaka varje n\u00e4tperiod \u2013 p\u00e5 grund av energilagring i magnetiska och elektriska f\u00e4lt (induktiva\/kapacitiva komponenter). Den bidrar inte till nyttigt arbete i lasten men beh\u00f6vs t.ex. f\u00f6r magnetisering. Den m\u00e4ts i var och anges ofta i kilovar (kvar).<\/p>\n <p>Effektfaktor, eller cos \u03c6, \u00e4r f\u00f6rh\u00e5llandet mellan aktiv och skenbar effekt: <em>cos \u03c6 = P\/S<\/em>.<\/p>\n <\/div>\n\n <div id=\"footnote\" class=\"results\" style=\"margin-top:20px;font-size:12px;text-align:center;\"><\/div>\n <\/div>\n<\/div>\n\n<script>\n(() => {\n const $ = id => document.getElementById(id);\n const SQRT3 = Math.sqrt(3);\n const nf2 = new Intl.NumberFormat('sv-SE', { maximumFractionDigits: 2 });\n\n \/\/ DOM\n const solveForEl = $(\"solveFor\");\n const voltageEl = $(\"voltage\");\n const currentEl = $(\"current\");\n const cosPhiEl = $(\"cosPhi\");\n const powerEl = $(\"power\");\n const resultEl = $(\"result\");\n const formulaPEl = $(\"formulaP\");\n const formulaIEl = $(\"formulaI\");\n const triangleSectionEl = $(\"triangleSection\");\n const triangleSvgEl = $(\"triangleSvg\");\n const triangleInfoEl = $(\"triangleInfo\");\n const footnoteEl = $(\"footnote\");\n\n \/\/ MathJax typeset\n function ensureTypeset() {\n if (!window.MathJax || !MathJax.typesetPromise) return;\n const pending = [];\n if (!formulaPEl.dataset.typeset) pending.push(formulaPEl);\n if (!formulaIEl.dataset.typeset) pending.push(formulaIEl);\n if (pending.length) {\n MathJax.typesetPromise(pending).then(() => pending.forEach(el => el.dataset.typeset = \"1\"));\n }\n }\n\n function updateFormulaVisibility() {\n if (solveForEl.value === 'P') {\n formulaPEl.style.display = 'block';\n formulaIEl.style.display = 'none';\n powerEl.setAttribute('readonly', 'readonly');\n currentEl.removeAttribute('readonly');\n } else {\n formulaPEl.style.display = 'none';\n formulaIEl.style.display = 'block';\n powerEl.removeAttribute('readonly');\n currentEl.setAttribute('readonly', 'readonly');\n }\n }\n\n \/\/ Parse helpers\n function parseVal(el) {\n const raw = String(el.value || '').trim().replace(\/\\s+\/g, '').replace(\/,\/g, '.');\n if (!raw) return NaN;\n const v = parseFloat(raw);\n return Number.isFinite(v) ? v : NaN;\n }\n\n function formatVal(num) {\n if (!Number.isFinite(num)) return '';\n return num.toFixed(2).replace('.', ',');\n }\n\n let internalUpdate = false;\n function setFieldValue(el, num) {\n let val = '';\n if (Number.isFinite(num)) {\n if (el.type === 'number') {\n \/\/ number-input kr\u00e4ver punkt som decimal\n val = num.toFixed(2);\n } else {\n \/\/ text-input kan visa svensk komma\n val = num.toFixed(2).replace('.', ',');\n }\n }\n if (el && el.value !== val) {\n internalUpdate = true;\n el.value = val;\n internalUpdate = false;\n }\n }\n\n function showResult(html) {\n resultEl.innerHTML = html;\n resultEl.style.display = 'block';\n }\n function hideResult() {\n resultEl.style.display = 'none';\n resultEl.innerHTML = '';\n }\n\n function updateTriangle(U, I, cos, PIn) {\n let Pcalc = NaN;\n let S = NaN;\n\n if (solveForEl.value === 'P') {\n if (Number.isFinite(U) && Number.isFinite(I)) Pcalc = U * I * cos * SQRT3;\n } else {\n Pcalc = Number.isFinite(PIn) ? PIn : NaN;\n }\n\n if (Number.isFinite(U) && Number.isFinite(I)) {\n S = SQRT3 * U * I;\n } else if (Number.isFinite(Pcalc) && Number.isFinite(cos) && cos > 0) {\n S = Pcalc \/ cos;\n }\n\n if (!Number.isFinite(Pcalc) || !Number.isFinite(S) || S <= 0) {\n triangleSectionEl.style.display = 'none';\n triangleSvgEl.innerHTML = '';\n triangleInfoEl.innerHTML = '';\n return;\n }\n\n const Q = Math.sqrt(Math.max(0, S*S - Pcalc*Pcalc));\n\n const Pk = Pcalc\/1000, Qk = Q\/1000, Sk = S\/1000;\n const rawMax = Math.max(Pk, Qk, Sk);\n const maxVal = rawMax * 1.03;\n\n const width = triangleSvgEl.clientWidth || triangleSvgEl.offsetWidth || 400;\n const height = triangleSvgEl.clientHeight || triangleSvgEl.offsetHeight || 300;\n\n const margin = 12;\n \/\/ Nu n\u00e4r Q-etiketten ligger till h\u00f6ger beh\u00f6vs ingen extra v\u00e4nsterbuffert\n const leftMargin = margin, rightMargin = margin, topMargin = margin, bottomMargin = margin + 28; \/\/ extra utrymme f\u00f6r P-etiketten under axeln\n\n const availW = width - leftMargin - rightMargin;\n const availH = height - topMargin - bottomMargin;\n const scale = Math.min(availW, availH) \/ (maxVal === 0 ? 1 : maxVal);\n\n const originX = leftMargin + (availW - (maxVal * scale)) \/ 2;\n const originY = height - bottomMargin;\n\n const pxEnd = originX + Pk*scale;\n const pyEnd = originY;\n const qxEnd = pxEnd;\n const qyEnd = originY - Qk*scale;\n \/\/ Q-benet ska alltid n\u00e5 ner till P (x-axeln)\n const qBottomY = originY;\n\n const sEndX = originX + Pk*scale;\n const sEndY = originY - Qk*scale;\n\n const r = Sk * scale;\n\n \/\/ Axlar ska m\u00f6ta cirkeln (inte hela ritytans kant)\n const axisXEnd = originX + r;\n const axisYEnd = originY - r;\n\n let svg = `<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 ${width} ${height}\" preserveAspectRatio=\"xMidYMid meet\">`;\n\n svg += `<path d=\"M ${originX} ${originY - r} A ${r} ${r} 0 0 1 ${originX + r} ${originY}\" fill=\"none\" stroke=\"#ccc\" stroke-width=\"1\"\/>`;\n\n const gridLines = 4;\n for (let i=1;i<=gridLines;i++){\n const gx = originX + (maxVal*scale\/gridLines)*i;\n const gy = originY - (maxVal*scale\/gridLines)*i;\n svg += `<line x1=\"${gx}\" y1=\"${originY}\" x2=\"${gx}\" y2=\"${originY - maxVal*scale}\" stroke=\"#eee\" stroke-width=\"1\"\/>`;\n svg += `<line x1=\"${originX}\" y1=\"${gy}\" x2=\"${originX + maxVal*scale}\" y2=\"${gy}\" stroke=\"#eee\" stroke-width=\"1\"\/>`;\n }\n\n svg += `<defs><marker id=\"arrow\" markerWidth=\"7\" markerHeight=\"7\" refX=\"6\" refY=\"3.5\" orient=\"auto\"><path d=\"M0,0 L7,3.5 L0,7 z\" fill=\"#666\"><\/path><\/marker><\/defs>`;\n\n svg += `<line x1=\"${originX}\" y1=\"${originY}\" x2=\"${pxEnd}\" y2=\"${pyEnd}\" stroke=\"#007bff\" stroke-width=\"2\"\/>`;\n svg += `<line x1=\"${pxEnd}\" y1=\"${qBottomY}\" x2=\"${pxEnd}\" y2=\"${qyEnd}\" stroke=\"#ffa500\" stroke-width=\"2\"\/>`;\n svg += `<line x1=\"${originX}\" y1=\"${originY}\" x2=\"${sEndX}\" y2=\"${sEndY}\" stroke=\"#28a745\" stroke-width=\"2\"\/>`;\n\n svg += `<line x1=\"${originX}\" y1=\"${originY}\" x2=\"${axisXEnd}\" y2=\"${originY}\" stroke=\"#666\" stroke-width=\"1\" marker-end=\"url(#arrow)\"\/>`;\n svg += `<line x1=\"${originX}\" y1=\"${originY}\" x2=\"${originX}\" y2=\"${axisYEnd}\" stroke=\"#666\" stroke-width=\"1\" marker-end=\"url(#arrow)\"\/>`;\n\n \n const phiRadLabel = Math.acos(Math.min(Math.max(Pcalc \/ S, -1), 1));\n const phiDegLabel = phiRadLabel * 180 \/ Math.PI;\n const phiLabelX = Math.max(leftMargin + 4, originX - 8);\n const phiLabelY = originY - 1; \/\/ tidigare -6, flyttad ned 5 px\n svg += `<text x=\"${phiLabelX}\" y=\"${phiLabelY}\" font-size=\"12\" text-anchor=\"end\" dominant-baseline=\"baseline\" fill=\"#444\">\u03c6 \u2248 ${nf2.format(phiDegLabel)}\u00b0<\/text>`;\n\n \/\/ s\u00e5 den aldrig beh\u00f6ver flyttas \u00e5t v\u00e4nster n\u00e4r cos\u03c6 \u2192 1\n const maxX = originX + maxVal * scale;\n const qLabelX = Math.min(pxEnd + 25, maxX - 6);\n \/\/ men s\u00e4kerst\u00e4ll att den aldrig ligger p\u00e5 x-axeln\n let qLabelY = (originY + qyEnd) \/ 2;\n qLabelY = Math.min(qLabelY, originY - 12);\n\n svg += `<text x=\"${originX + (pxEnd - originX)\/2}\" y=\"${originY + 18}\" font-size=\"12\" text-anchor=\"middle\" dominant-baseline=\"hanging\" fill=\"#007bff\">P \u2248 ${nf2.format(Pk)} kW<\/text>`;\n svg += `<text x=\"${qLabelX}\" y=\"${qLabelY}\" font-size=\"12\" text-anchor=\"start\" dominant-baseline=\"middle\" fill=\"#ffa500\">Q \u2248 ${nf2.format(Qk)} kvar<\/text>`;\n\n const dxS = sEndX - originX;\n const dyS = sEndY - originY;\n\n const baseSX = originX + dxS * 0.5;\n const baseSY = originY + dyS * 0.5;\n\n const lenS = Math.hypot(dxS, dyS) || 1;\n let nX = dyS \/ lenS; \/\/ < 0 n\u00e4r S lutar upp\u00e5t \u2192 v\u00e4nster\n let nY = -dxS \/ lenS; \/\/ \u2264 0 \u2192 upp\u00e5t eller rakt \u00e5t v\u00e4nster\n if (nY > 0) { nX = -nX; nY = -nY; }\n\n let sOffset = 24 + r * 0.07 + (1 - Math.min(Math.max(cos, 0), 1)) * 24; \/\/ 24..~64 px\n sOffset = Math.max(18, Math.min(64, sOffset));\n\n let sLabelX = baseSX + nX * sOffset;\n let sLabelY = baseSY + nY * sOffset;\n\n const minXc = leftMargin + 2, maxXc = originX + maxVal*scale - 6;\n const minYc = originY - maxVal*scale + 6, maxYc = originY - 6;\n sLabelX = Math.max(minXc, Math.min(maxXc, sLabelX));\n sLabelY = Math.max(minYc, Math.min(maxYc, sLabelY));\n\n svg += `<text x=\"${sLabelX}\" y=\"${sLabelY}\" font-size=\"12\" text-anchor=\"middle\" dominant-baseline=\"middle\" fill=\"#28a745\">S \u2248 ${nf2.format(Sk)} kVA<\/text>`;\n\n svg += `<\/svg>`;\n triangleSvgEl.innerHTML = svg;\n\n const phiRad = Math.acos(Math.min(Math.max(Pcalc \/ S, -1), 1));\n const phiDeg = phiRad * 180\/Math.PI;\n const infoHTML =\n `\u03c6 = cos\u207b\u00b9(${nf2.format(Pcalc)} \/ ${nf2.format(S)}) \u2248 ${nf2.format(phiDeg)}\u00b0` +\n `<br>P = ${nf2.format(Pcalc)} W (${nf2.format(Pcalc\/1000)} kW)` +\n `<br>Q = ${nf2.format(Q)} var (${nf2.format(Q\/1000)} kvar)` +\n `<br>S = ${nf2.format(S)} VA (${nf2.format(S\/1000)} kVA)`;\n\n triangleInfoEl.innerHTML = '';\n\n let phiBelow = document.getElementById('phiBelow');\n if (!phiBelow) {\n phiBelow = document.createElement('div');\n phiBelow.id = 'phiBelow';\n phiBelow.style.marginTop = '6px';\n resultEl.appendChild(phiBelow);\n }\n phiBelow.innerHTML = infoHTML;\n\n triangleSectionEl.style.display = 'block';\n }\n\n function calculate() {\n if (internalUpdate) return;\n const mode = solveForEl.value;\n const U = parseVal(voltageEl);\n const I = parseVal(currentEl);\n const cosRaw = String(cosPhiEl.value || '').trim().replace(\/\\s+\/g, '').replace(\/,\/g, '.');\n const cosParsed = parseFloat(cosRaw);\n const cosIsTransitional = (cosRaw === '.' || cosRaw === '');\n const cosVal = Number.isFinite(cosParsed) ? cosParsed : (cosIsTransitional ? 0 : NaN);\n const Pval = parseVal(powerEl);\n\n if ((!Number.isFinite(cosParsed) && !cosIsTransitional) || cosVal < 0 || cosVal > 1) {\n hideResult();\n triangleSectionEl.style.display = 'none';\n const phiBelow = document.getElementById('phiBelow');\n if (phiBelow) phiBelow.innerHTML = '';\n return;\n }\n\n let value;\n if (mode === 'P') {\n if (!Number.isFinite(U) || !Number.isFinite(I)) {\n hideResult();\n triangleSectionEl.style.display = 'none';\n return;\n }\n value = U * I * cosVal * SQRT3;\n setFieldValue(powerEl, value);\n showResult(`Resultat:<br><strong>${nf2.format(value)} W<\/strong> (${nf2.format(value\/1000)} kW)<br><small>U=${nf2.format(U)} V, I=${nf2.format(I)} A<\/small>`);\n updateTriangle(U, I, cosVal, NaN);\n } else {\n if (!Number.isFinite(Pval) || !Number.isFinite(U) || U <= 0 ) {\n hideResult();\n triangleSectionEl.style.display = 'none';\n return;\n }\n if (!(cosVal > 0)) {\n showResult(`Resultat:<br><small>P=${nf2.format(Pval)} W, U=${nf2.format(U)} V<\/small>`);\n triangleSectionEl.style.display = 'none';\n const pb = document.getElementById('phiBelow'); if (pb) pb.innerHTML = '';\n return;\n }\n value = Pval \/ (U * cosVal * SQRT3);\n setFieldValue(currentEl, value);\n showResult(`Resultat:<br><strong>${nf2.format(value)} A<\/strong><br><small>P=${nf2.format(Pval)} W, U=${nf2.format(U)} V<\/small>`);\n updateTriangle(U, value, cosVal, Pval);\n }\n }\n\n [voltageEl, currentEl, cosPhiEl, powerEl].forEach(el => {\n el.addEventListener('input', () => {\n if (internalUpdate) return;\n if ((el === cosPhiEl || el === powerEl) && el.value.includes(',')) {\n internalUpdate = true; el.value = el.value.replace(\/,\/g,'.'); internalUpdate = false;\n }\n calculate();\n });\n el.addEventListener('blur', () => {\n if ((el.value||'').includes(',')) {\n internalUpdate = true; el.value = el.value.replace(\/,\/g,'.'); internalUpdate = false;\n }\n });\n });\n\n solveForEl.addEventListener('change', () => { updateFormulaVisibility(); ensureTypeset(); calculate(); });\n\n updateFormulaVisibility();\n ensureTypeset();\n calculate();\n if (window.requestAnimationFrame) requestAnimationFrame(calculate);\n if (window.ResizeObserver) { new ResizeObserver(() => calculate()).observe(triangleSvgEl); }\n window.addEventListener('resize', calculate);\n\n (function manageVersion() {\n const today = new Date().toISOString().split('T')[0];\n const key = 'ef3f_version';\n const base = '1.2.0';\n try {\n const stored = localStorage.getItem(key);\n let vStr = base;\n let storedDate = '';\n if (stored) {\n const partsStored = stored.split('::');\n if (partsStored[0]) vStr = partsStored[0];\n if (partsStored[1]) storedDate = partsStored[1];\n }\n \/\/ Bump patch om datumet \u00e4ndrats eller inget lagrat finns\n if (!stored || storedDate !== today) {\n const parts = vStr.split('.').map(x => parseInt(x, 10));\n parts[2] = (parts[2] || 0) + 1;\n vStr = `${parts.join('.')}`;\n localStorage.setItem(key, `${vStr}::${today}`);\n }\n footnoteEl.textContent = `Genererat med ChatGPT (GPT-5 Thinking) \u2022 v${vStr} \u2014 ${today} \u2022 formler verifierade`;\n } catch (e) {\n footnoteEl.textContent = `Genererat med ChatGPT (GPT-5 Thinking) \u2022 v${base}`;\n }\n })();\n})();\n<\/script>\n<\/body>\n<\/html>\n\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trefas effektkalkylator \u2013 P, Q, S & cos \u03c6 | HINTEK Power Solutions AB Effektformel \u2013 3-fas $$P = U […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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