{"id":21771,"date":"2026-01-15T23:26:15","date_gmt":"2026-01-15T23:26:15","guid":{"rendered":"https:\/\/circuitenergy.ca\/staging\/8539\/?page_id=21771"},"modified":"2026-02-19T21:28:05","modified_gmt":"2026-02-19T21:28:05","slug":"total-harmonic-distortion-thd-and-total-demand-distortion-tdd","status":"publish","type":"page","link":"https:\/\/circuitenergy.ca\/staging\/8539\/total-harmonic-distortion-thd-and-total-demand-distortion-tdd\/","title":{"rendered":"Total Harmonic Distortion (THD) and Total Demand Distortion (TDD)"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"21771\" class=\"elementor elementor-21771\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-429d873 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"429d873\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-104a495\" data-id=\"104a495\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-f7e8134 elementor-invisible elementor-widget elementor-widget-image\" data-id=\"f7e8134\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" loading=\"lazy\" width=\"819\" height=\"1024\" src=\"https:\/\/circuitenergy.ca\/staging\/8539\/wp-content\/uploads\/2026\/01\/7-819x1024.webp\" class=\"attachment-large size-large wp-image-21773\" alt=\"\" srcset=\"https:\/\/circuitenergy.ca\/staging\/8539\/wp-content\/uploads\/2026\/01\/7-819x1024.webp 819w, https:\/\/circuitenergy.ca\/staging\/8539\/wp-content\/uploads\/2026\/01\/7-240x300.webp 240w, https:\/\/circuitenergy.ca\/staging\/8539\/wp-content\/uploads\/2026\/01\/7-768x960.webp 768w, https:\/\/circuitenergy.ca\/staging\/8539\/wp-content\/uploads\/2026\/01\/7-440x550.webp 440w, https:\/\/circuitenergy.ca\/staging\/8539\/wp-content\/uploads\/2026\/01\/7-1060x1325.webp 1060w, https:\/\/circuitenergy.ca\/staging\/8539\/wp-content\/uploads\/2026\/01\/7-550x688.webp 550w, https:\/\/circuitenergy.ca\/staging\/8539\/wp-content\/uploads\/2026\/01\/7-400x500.webp 400w, https:\/\/circuitenergy.ca\/staging\/8539\/wp-content\/uploads\/2026\/01\/7-864x1080.webp 864w, https:\/\/circuitenergy.ca\/staging\/8539\/wp-content\/uploads\/2026\/01\/7.webp 1080w\" sizes=\"auto, (max-width: 819px) 100vw, 819px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2d45979 elementor-widget elementor-widget-qi_addons_for_elementor_animated_text\" data-id=\"2d45979\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"qi_addons_for_elementor_animated_text.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"qodef-shortcode qodef-m qodef-qi-animated-text qodef--animated-by-letter qodef--alignment-left qodef-qi--has-appear qodef--appear-from-right\" >\n\t\t<h1 class=\"qodef-m-title\">\n\t\t<span class=\"qodef-e-word-holder\">What<\/span> <span class=\"qodef-e-word-holder\">is<\/span> <span class=\"qodef-e-word-holder\">inside<\/span>\t<\/h1>\n<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c6c027b elementor-widget elementor-widget-text-editor\" data-id=\"c6c027b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-path-to-node=\"1\"><span data-path-to-node=\"1,1\"><span class=\"citation-339\">This engineering document from <\/span><b data-path-to-node=\"1,1\" data-index-in-node=\"31\"><span class=\"citation-339\">Circuit Energy<\/span><\/b><span class=\"citation-339\"> breaks down the essential metrics for maintaining electrical reliability and meeting grid standards<\/span><\/span><span data-path-to-node=\"1,3\">. <\/span><span data-path-to-node=\"1,5\"><span class=\"citation-338\">It specifically focuses on current distortion to ensure the efficient operation of your facility\u2019s equipment<\/span><\/span><span data-path-to-node=\"1,7\">.<\/span><\/p><h3 data-path-to-node=\"2\">Why THD and TDD Matter<\/h3><ul><li data-path-to-node=\"3,0,1\"><span data-path-to-node=\"3,0,1,0\"><b data-path-to-node=\"3,0,1,0\" data-index-in-node=\"0\"><span class=\"citation-337\">Total Harmonic Distortion (THD):<\/span><\/b><span class=\"citation-337\"> Quantifies how much a current waveform deviates from its fundamental frequency<\/span><\/span><span data-path-to-node=\"3,0,1,2\">. <\/span><span data-path-to-node=\"3,0,1,4\"><span class=\"citation-336\">While it identifies potential risks to equipment life, high THD at low loads is often not a concern for the utility grid<\/span><\/span><span data-path-to-node=\"3,0,1,6\">.<\/span><\/li><li data-path-to-node=\"3,1,1\"><span data-path-to-node=\"3,1,1,0\"><b data-path-to-node=\"3,1,1,0\" data-index-in-node=\"0\"><span class=\"citation-335\">Total Demand Distortion (TDD):<\/span><\/b><span class=\"citation-335\"> Measures distortion relative to your <\/span><b data-path-to-node=\"3,1,1,0\" data-index-in-node=\"68\"><span class=\"citation-335\">maximum demand load current<\/span><\/b><\/span><span data-path-to-node=\"3,1,1,2\">. <\/span><span data-path-to-node=\"3,1,1,4\"><span class=\"citation-334\">This is the \u201ctrue\u201d measure of impact on the grid and is the primary metric used by utilities to ensure system-wide stability<\/span><\/span><span data-path-to-node=\"3,1,1,6\">.<\/span><\/li><li data-path-to-node=\"3,2,1\"><span data-path-to-node=\"3,2,1,0\"><b data-path-to-node=\"3,2,1,0\" data-index-in-node=\"0\"><span class=\"citation-333\">IEEE 519-2022 Compliance:<\/span><\/b><span class=\"citation-333\"> TDD limits are strictly regulated based on the ratio of short-circuit current to your facility\u2019s demand (<\/span><span class=\"math-inline\" data-math=\"I_{SC}\/I_{L}\" data-index-in-node=\"131\"><span class=\"katex\"><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord mathnormal\"><span class=\"citation-333\">I<\/span><\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mathnormal mtight\"><span class=\"citation-333\">SC<\/span><\/span><\/span><\/span><\/span><\/span><span class=\"vlist-s\"><span class=\"citation-333\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mord\"><span class=\"citation-333\">\/<\/span><\/span><span class=\"mord\"><span class=\"mord mathnormal\"><span class=\"citation-333\">I<\/span><\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\"><span class=\"mord mathnormal mtight\"><span class=\"citation-333\">L<\/span><\/span><\/span><\/span><\/span><\/span><span class=\"vlist-s\"><span class=\"citation-333\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"citation-333\">)<\/span><\/span><span data-path-to-node=\"3,2,1,2\">.<\/span><\/li><\/ul><h3 data-path-to-node=\"4\">The Cost of Ignoring Distortion<\/h3><ul><li data-path-to-node=\"5,0,1\"><span data-path-to-node=\"5,0,1,0\"><b data-path-to-node=\"5,0,1,0\" data-index-in-node=\"0\"><span class=\"citation-332\">Equipment Damage:<\/span><\/b><span class=\"citation-332\"> High distortion levels lead to the overheating of transformers, cables, and motors<\/span><\/span><span data-path-to-node=\"5,0,1,2\">.<\/span><\/li><li class=\"source-inline-chip-container ng-star-inserted\"><span data-path-to-node=\"5,1,1,0\"><b data-path-to-node=\"5,1,1,0\" data-index-in-node=\"0\"><span class=\"citation-331\">Operational Malfunction:<\/span><\/b><span class=\"citation-331\"> Harmonics can cause sensitive electronics to fail or interfere with critical communication systems<\/span><\/span><span data-path-to-node=\"5,1,1,2\">.<\/span><\/li><\/ul><p data-path-to-node=\"5,2,1\"><span data-path-to-node=\"5,2,1,0\"><b data-path-to-node=\"5,2,1,0\" data-index-in-node=\"0\"><span class=\"citation-330\">Utility Penalties:<\/span><\/b><span class=\"citation-330\"> Large customers with high demand are subject to stricter limits at the Point of Common Coupling (PCC) to prevent grid disruption<\/span><\/span><span data-path-to-node=\"5,2,1,2\">.<\/span><\/p><p>\u00a0<\/p><p data-path-to-node=\"6\"><b data-path-to-node=\"6\" data-index-in-node=\"0\">Is your facility operating within IEEE 519-2022 limits?<\/b> Download the full technical document to access the complete current distortion limit tables and see a step-by-step practical calculation example.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-9187d6c\" data-id=\"9187d6c\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-d499eb0 elementor-widget elementor-widget-html\" data-id=\"d499eb0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<script src=\"https:\/\/js.hsforms.net\/forms\/embed\/5149836.js\" defer><\/script>\n<div class=\"hs-form-frame\" data-region=\"na1\" data-form-id=\"7805f968-7030-4eea-946f-6a2710744649\" data-portal-id=\"5149836\"><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>What is inside This engineering document from Circuit Energy breaks down the essential metrics for maintaining electrical reliability and meeting grid standards. It specifically [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-custom.php","meta":{"_acf_changed":false,"nf_dc_page":"","footnotes":""},"class_list":["post-21771","page","type-page","status-publish","hentry"],"acf":{"choi\u0441e_menu_page":false,"full_width":false,"header_transparent":false,"header_white":false,"menu_align_page":"default","menu_style":""},"_links":{"self":[{"href":"https:\/\/circuitenergy.ca\/staging\/8539\/wp-json\/wp\/v2\/pages\/21771","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/circuitenergy.ca\/staging\/8539\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/circuitenergy.ca\/staging\/8539\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/circuitenergy.ca\/staging\/8539\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/circuitenergy.ca\/staging\/8539\/wp-json\/wp\/v2\/comments?post=21771"}],"version-history":[{"count":7,"href":"https:\/\/circuitenergy.ca\/staging\/8539\/wp-json\/wp\/v2\/pages\/21771\/revisions"}],"predecessor-version":[{"id":21929,"href":"https:\/\/circuitenergy.ca\/staging\/8539\/wp-json\/wp\/v2\/pages\/21771\/revisions\/21929"}],"wp:attachment":[{"href":"https:\/\/circuitenergy.ca\/staging\/8539\/wp-json\/wp\/v2\/media?parent=21771"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}