{"id":2359,"date":"2026-08-11T09:00:00","date_gmt":"2026-08-11T01:00:00","guid":{"rendered":"https:\/\/cnbygele.com\/blog\/thd-vs-tdd-measurement-plant-engineers\/"},"modified":"2026-08-11T09:00:00","modified_gmt":"2026-08-11T01:00:00","slug":"thd-vs-tdd-measurement-plant-engineers","status":"publish","type":"post","link":"https:\/\/cnbygele.com\/ru\/blog\/thd-vs-tdd-measurement-plant-engineers\/","title":{"rendered":"\u041a\u0413\u0418 \u043f\u0440\u043e\u0442\u0438\u0432 \u041a\u0422\u0418: \u0433\u0434\u0435 \u0438\u043d\u0436\u0435\u043d\u0435\u0440\u0430\u043c \u043f\u0440\u0435\u0434\u043f\u0440\u0438\u044f\u0442\u0438\u0439 \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u044c \u0438\u0437\u043c\u0435\u0440\u0435\u043d\u0438\u044f"},"content":{"rendered":"<div class=\"b2b-article\">\n<p style=\"margin:0 0 16px;line-height:1.7\">THD and TDD become useful engineering records only when the electrical location, current reference, and operating state are retained with the value. A local VFD input, a process feeder, and a common coupling boundary are not interchangeable measurement points, even when a meter displays the same type of percentage.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">\u041d\u0430\u0447\u043d\u0438\u0442\u0435 \u0441 <a href=\"https:\/\/cnbygele.com\/ru\/power-quality-system-guides\/\">\u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u0430 \u043f\u043e \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u043c \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0430 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u044d\u043d\u0435\u0440\u0433\u0438\u0438<\/a> for broader planning context. This article explains how to keep a THD\/TDD comparison reviewable; it does not establish a plant limit, equipment size, or project result.<\/p>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" src=\"https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/04\/12.BY83.webp\" alt=\"CNBYG panel device for documenting a THD and TDD measurement review\" \/><\/figure>\n<nav class=\"b2b-toc\" style=\"background:#f5f8fa;padding:16px 20px;border-radius:8px;margin:0 0 24px\">\n<h2 id=\"contents\" style=\"margin:42px 0 14px;scroll-margin-top:96px\">\u0421\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435<\/h2>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\"><a href=\"#part-1-start-with-the-decision-boundary\">Part 1. Start with the decision boundary<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-2-keep-the-denominator-with-the-number\">Part 2. Keep the denominator with the number<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-3-place-meters-for-the-question-being-asked\">Part 3. Place meters for the question being asked<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-4-log-states-that-make-readings-comparable\">Part 4. Log states that make readings comparable<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-5-separate-index-review-from-equipment-selection\">Part 5. Separate index review from equipment selection<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-6-send-a-reviewable-measurement-package\">Part 6. Send a reviewable measurement package<\/a><\/li>\n<\/ul>\n<\/nav>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"direct-answer\">\u041f\u0440\u044f\u043c\u043e\u0439 \u043e\u0442\u0432\u0435\u0442<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Compare THD and TDD only after naming the decision boundary and retaining the reference current used for the calculation. The number gains meaning from where it was measured, what was running, and which reference basis belongs to the report.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-1-start-with-the-decision-boundary\">Part 1. Start with the decision boundary<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Before collecting values, write down the engineering question. A team may be characterizing one drive, comparing a production feeder, or preparing data for a supply-side assessment. Each question calls for a different electrical location and a different set of coincident loads.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Put the meter point, voltage reference, and CT orientation on the one-line diagram. Retain the CT ratio, capture interval, time base, and the responsible reviewer. A later reader should be able to identify whether the exported record represents a local input or a shared feeder.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>\u0412\u0430\u0436\u043d\u043e:<\/strong> Do not treat a local measurement as proof of a wider boundary. The assessment location, operating condition, and acceptance method must be agreed together (<a href=\"https:\/\/standards.ieee.org\/ieee\/519\/5892\/\" rel=\"nofollow noopener\" target=\"_blank\">\u041e\u0431\u0437\u043e\u0440 IEEE 519<\/a>).<\/p>\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Decision to support<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Suitable record boundary<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Record that must travel with it<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Diagnose one drive group<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Defined drive input or local feeder<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Drive identity, operating state, CT and voltage reference<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Compare a process area<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Process distribution feeder<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Running loads and feeder one-line position<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Prepare a system discussion<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Defined supply-side or common boundary<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Project boundary, time window, and review owner<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-2-keep-the-denominator-with-the-number\">Part 2. Keep the denominator with the number<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">THD and TDD are not labels to detach from the report. The comparison should state the current reference basis used by the meter or calculation and preserve the associated configuration. Without that context, a percentage can look more or less severe simply because the production state changed.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">For practical review, retain a short definition note beside every export. Do not copy a value from a screen into a quotation request without its denominator, location, time interval, and load state. Those omissions make it difficult to decide whether two records are comparable.<\/p>\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Review question<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Information to retain<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">\u041f\u043e\u0447\u0435\u043c\u0443 \u044d\u0442\u043e \u0432\u0430\u0436\u043d\u043e<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">What index is shown?<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Meter label and current-reference setting<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Avoids comparing differently based values as though they are identical.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Which interval produced it?<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Start time, duration, and aggregation<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">A transient and a representative operating interval are not the same record.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">What was energized?<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Process, VFD, capacitor, and other-load state<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">The feeder composition may have changed.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">What is the decision?<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Monitoring, troubleshooting, or RFQ purpose<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Keeps a percentage from becoming an unsupported equipment instruction.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"margin:0 0 16px;line-height:1.7\">The existing guide to <a href=\"https:\/\/cnbygele.com\/ru\/blog\/power-factor-versus-harmonic-distortion-selection\/\">power-factor and harmonic-distortion decisions<\/a> is useful when the project team is deciding which electrical objective is actually under review.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-3-place-meters-for-the-question-being-asked\">Part 3. Place meters for the question being asked<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Meter placement is not a paperwork detail. The placement defines the loads included in the current record and the voltage source used for the comparison. A drive terminal can help answer a local troubleshooting question, while a feeder record can include several drive groups and other coincident loads.<\/p>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" src=\"https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/04\/13.BY83.webp\" alt=\"CNBYG panel device rear connection view for a documented measurement boundary\" \/><\/figure>\n<p style=\"margin:0 0 16px;line-height:1.7\">Draw a simple boundary diagram before the record begins. Mark the incoming source, outgoing circuits, CT locations, voltage taps, and any bypass or parallel path that can change the included load. If the plant has multiple operating modes, make a separate entry for each mode instead of averaging unlike conditions into one anonymous value.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">\u0417\u0435\u043c\u043b\u044f <a href=\"https:\/\/www.nema.org\/standards\/view\/motors-and-generators\" rel=\"nofollow noopener\" target=\"_blank\">NEMA MG 1 overview<\/a> provides motor-system context, but it does not define the correct plant measurement boundary or select mitigation equipment for a specific installation.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-4-log-states-that-make-readings-comparable\">Part 4. Log states that make readings comparable<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">An electrical trend without an operating log is hard to interpret. Name the process state, production line, bypass condition, starts and stops, and major coincident loads. A comparable data set is usually smaller and better labeled than a large folder of undated screenshots.<\/p>\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Operating-state item<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Log beside the electrical trend<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">\u041e\u0431\u0437\u043e\u0440 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Production state<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Product run, speed range, and shift<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Identifies whether records describe similar work.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Nonlinear loads<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Active drive groups, rectifiers, and UPS loads<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Shows which sources may be included.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Switching changes<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Capacitor, bypass, transfer, or maintenance state<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Explains changes that may not be steady-state behavior.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Supply condition<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Known source or feeder configuration change<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Helps keep supply-side events separate from a local theory.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"margin:0 0 16px;line-height:1.7\">For an RFQ-ready baseline, use <a href=\"https:\/\/cnbygele.com\/ru\/blog\/power-quality-metering-before-apf-svg-rfq\/\">metering before an RFQ<\/a> as a companion checklist. It is a planning aid, not a compliance certificate.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-5-separate-index-review-from-equipment-selection\">Part 5. Separate index review from equipment selection<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Treat the index review as a scope-definition step rather than a device instruction. Before discussing an AHF\/APF option, define the harmonic-current objective, connection point, CT arrangement, representative load record, protection coordination, installation limits, and acceptance method.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">\u0417\u0435\u043c\u043b\u044f <a href=\"https:\/\/cnbygele.com\/ru\/product\/ahf-active-harmonic-filter-harmonic-control\/\">\u0410\u043a\u0442\u0438\u0432\u043d\u044b\u0439 \u0444\u0438\u043b\u044c\u0442\u0440 \u0433\u0430\u0440\u043c\u043e\u043d\u0438\u043a AHF<\/a> page is a product-line starting point for a defined harmonic-current scope. It is not a promise that a particular percentage, plant limit, or operational outcome will be achieved.<\/p>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" src=\"https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/04\/11.JKW5C.webp\" alt=\"CNBYG controller used as product context after a defined measurement review\" \/><\/figure>\n<p style=\"margin:0 0 16px;line-height:1.7\">This fit boundary is important. A voltage event, a reactive-power-only objective, a protection concern, or a record without a defined electrical boundary may require a different investigation. The <a href=\"https:\/\/cnbygele.com\/ru\/blog\/ieee-519-harmonic-limits-apf-sizing\/\">IEEE 519 assessment context<\/a> should be reviewed with project-specific responsibilities rather than used as a generic device-size shortcut.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-6-send-a-reviewable-measurement-package\">Part 6. Send a reviewable measurement package<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">A clear inquiry lets a supplier or engineering team understand what the numbers represent. Send a compact record set rather than only a single percentage from a screen.<\/p>\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">\u041f\u043e\u043a\u0443\u043f\u0430\u0442\u0435\u043b\u044c \u0434\u043e\u043b\u0436\u0435\u043d \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u0438\u0442\u044c<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">\u041f\u043e\u0447\u0435\u043c\u0443 \u044d\u0442\u043e \u0432\u0430\u0436\u043d\u043e<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">\u041e\u0434\u043d\u043e\u043b\u0438\u043d\u0435\u0439\u043d\u0430\u044f \u0441\u0445\u0435\u043c\u0430 \u0438 \u043d\u043e\u043c\u0438\u043d\u0430\u043b\u044c\u043d\u044b\u0435 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b \u0441\u0438\u0441\u0442\u0435\u043c\u044b<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">\u0423\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u0442 \u044d\u043b\u0435\u043a\u0442\u0440\u0438\u0447\u0435\u0441\u043a\u0443\u044e \u0433\u0440\u0430\u043d\u0438\u0446\u0443 \u0438 \u043a\u043e\u043d\u0442\u0435\u043a\u0441\u0442 \u043f\u0438\u0442\u0430\u043d\u0438\u044f.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Meter, CT, and voltage-reference positions<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Lets reviewers locate the actual measurement point.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">THD\/TDD exports with stated current reference<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Preserves the calculation basis.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Operating-state log and load inventory<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Connects trends to the loads that were running.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Existing mitigation and protection details<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Identifies integration constraints.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Space, cooling, cable, communication, and acceptance requirements<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Tests whether a defined solution scope is feasible.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"margin:0 0 16px;line-height:1.7\">CNBYG can discuss product-line fit when the harmonic-current objective and plant boundary are defined. Use <a href=\"https:\/\/cnbygele.com\/ru\/contact-us\/\">the measurement package<\/a> to begin that discussion; a general article cannot replace a plant study or guarantee an electrical result.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"frequently-asked-questions\">\u0427\u0430\u0441\u0442\u043e \u0437\u0430\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0435 \u0432\u043e\u043f\u0440\u043e\u0441\u044b<\/h2>\n<h3 style=\"margin:28px 0 12px\">Is THD the same as TDD?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">No. Both labels need the reported current reference, measurement location, and operating condition beside the value. Do not compare percentages from different bases as though they describe the same record.<\/p>\n<h3 style=\"margin:28px 0 12px\">Where should plant current distortion be measured?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Measure at the electrical location that matches the decision being made, and show that location on the one-line diagram. A drive input and a common feeder are different boundaries.<\/p>\n<h3 style=\"margin:28px 0 12px\">Can a VFD input reading represent a plant feeder?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Not automatically. A VFD input record describes that local location, while a feeder can include several connected loads and supply arrangements.<\/p>\n<h3 style=\"margin:28px 0 12px\">Why record the operating state?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">The load mix may change by shift, product, speed, switching state, or maintenance condition. The operating log makes two electrical records comparable.<\/p>\n<h3 style=\"margin:28px 0 12px\">Does IEEE 519 select a device size?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">No. It supplies harmonic-control context, while a project still needs its own boundary, measured evidence, integration scope, and acceptance criteria.<\/p>\n<h3 style=\"margin:28px 0 12px\">What belongs in a measurement-led RFQ?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Send the one-line diagram, nominal data, meter and CT positions, stated current reference, representative exports, operating log, load inventory, existing equipment, and installation constraints.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"references\">\u0421\u0441\u044b\u043b\u043a\u0438<\/h2>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/standards.ieee.org\/ieee\/519\/5892\/\" rel=\"nofollow noopener\" target=\"_blank\">IEEE 519 overview for harmonic-control assessment<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/www.nema.org\/standards\/view\/motors-and-generators\" rel=\"nofollow noopener\" target=\"_blank\">NEMA MG 1 publication for motor-system context<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/www.energy.gov\/cmei\/ito\/industrial-technologies-office\" rel=\"nofollow noopener\" target=\"_blank\">DOE Industrial Technologies Office resources<\/a><\/li>\n<\/ul>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>THD and TDD become useful engineering records only when the electrical location, current reference, and operating state are retained with the value. A local VFD input, a process feeder, and a common coupling boundary are not interchangeable measurement points, even when a meter displays the same type of percentage. Start with the power quality system [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1620,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-2359","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":7}},"acf":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/posts\/2359","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/comments?post=2359"}],"version-history":[{"count":0,"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/posts\/2359\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/media\/1620"}],"wp:attachment":[{"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/media?parent=2359"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/categories?post=2359"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/tags?post=2359"}],"curies":[{"name":"\u0432\u043f","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}