{"id":2113,"date":"2026-07-11T09:00:00","date_gmt":"2026-07-11T01:00:00","guid":{"rendered":"https:\/\/cnbygele.com\/blog\/preventing-capacitor-harmonic-resonance-in-industrial-systems\/"},"modified":"2026-07-11T21:23:19","modified_gmt":"2026-07-11T13:23:19","slug":"preventing-capacitor-harmonic-resonance-in-industrial-systems","status":"publish","type":"post","link":"https:\/\/cnbygele.com\/fr\/blog\/preventing-capacitor-harmonic-resonance-in-industrial-systems\/","title":{"rendered":"Pr\u00e9vention de la r\u00e9sonance harmonique des condensateurs dans les syst\u00e8mes industriels"},"content":{"rendered":"<div class=\"cnbyg-article\" style=\"max-width:820px;margin:0 auto;\">\n<p style=\"margin:0 0 16px;line-height:1.7;\"><strong>Capacitor harmonic resonance<\/strong> occurs when capacitor steps form a tuned or near-tuned branch with system inductance, amplifying harmonic current instead of improving power factor. This guide focuses on practical evaluation steps for U.S. industrial and commercial buyers\u2014measurement, documentation, and lifecycle support\u2014not generic marketing claims. Where equipment selection is involved, cross-check public specifications on cnbygele.com and confirm project-specific limits with your utility or consulting engineer. Section checklists can be reused as RFQ attachments and commissioning handover outlines.<\/p>\n<nav style=\"background:#f7f9fb;border:1px solid #e3e8ee;border-radius:8px;padding:14px 18px;margin:0 0 24px;\">\n<p style=\"margin:0 0 16px;line-height:1.7;\"><strong>On this page<\/strong><\/p>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7;\">\n<li style=\"margin:0 0 16px;line-height:1.7;\"><a href=\"#part-1-how-resonance-develops\">Part 1. How Resonance Develops<\/a><\/li>\n<li style=\"margin:0 0 16px;line-height:1.7;\"><a href=\"#part-2-detuning-and-bank-design\">Part 2. Detuning and Bank Design<\/a><\/li>\n<li style=\"margin:0 0 16px;line-height:1.7;\"><a href=\"#part-3-operating-and-maintenance-discipline\">Part 3. Operating and Maintenance Discipline<\/a><\/li>\n<li style=\"margin:0 0 16px;line-height:1.7;\"><a href=\"#part-4-documentation-and-handover-checklist\">Part 4. Documentation and Handover Checklist<\/a><\/li>\n<li style=\"margin:0 0 16px;line-height:1.7;\"><a href=\"#part-5-commissioning-monitoring-and-long-term-op\">Part 5. Commissioning, Monitoring, and Long-Term Operations<\/a><\/li>\n<\/ul>\n<\/nav>\n<figure style=\"margin:26px 0;text-align:center;\"><img loading=\"lazy\" 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\/07\/preventing-capacitor-harmonic-resonance-in-industrial-systems-cover.webp\" alt=\"Capacitor harmonic resonance prevention concept illustration\" width=\"640\" height=\"360\"\/><\/figure>\n<h2 id=\"part-1-how-resonance-develops\" style=\"margin:42px 0 14px;font-size:1.35em;line-height:1.3;\">Part 1. How Resonance Develops<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Each capacitor step with line and transformer inductance creates a parallel resonant frequency.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">When that frequency sits near dominant VFD or rectifier orders, current amplification can overheat capacitors and fuses.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Nonlinear loads draw current in pulses, creating harmonic currents that propagate through the distribution system.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">IEEE 519 is widely referenced in the U.S. for harmonic limits at the point of common coupling\u2014confirm applicability with your utility contract.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\"><a href=\"https:\/\/cnbygele.com\/product\/ahf-active-harmonic-filter-harmonic-control-2\/\">active harmonic filters<\/a> inject opposing harmonic current to cancel distortion at the source or feeder level.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Capture nameplate data, single-line drawings, and utility interconnection rules in the RFQ package to reduce back-and-forth during technical review.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">If your site mixes linear motors and nonlinear electronics, treat harmonic and reactive targets as linked requirements rather than separate purchases.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Define acceptance criteria before shipment\u2014power factor, step response, or THD at agreed load points\u2014so commissioning disputes are less likely.<\/p>\n<div class=\"tip-box\" style=\"border-left:4px solid #2e7d32;background:#f3faf4;padding:12px 16px;margin:0 0 18px;line-height:1.7;\"><strong>Tip:<\/strong> Log harmonic spectrum before adding new capacitor steps\u2014not only power factor.<\/div>\n<h2 id=\"part-2-detuning-and-bank-design\" style=\"margin:42px 0 14px;font-size:1.35em;line-height:1.3;\">Part 2. Detuning and Bank Design<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Series <a href=\"https:\/\/cnbygele.com\/product\/cksg-series-low-voltage-series-reactors\/\">filter reactors<\/a> with p=7% or p=14% shift resonance below typical 5th\/3rd dominance.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Pair detuned branches with <a href=\"https:\/\/cnbygele.com\/product\/by75-series-reactive-power-compensation-controller\/\">compensation controllers<\/a> that block switching when THD is high if supported.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Passive tuned filters provide harmonic mitigation for specific orders but require careful resonance analysis with existing capacitors.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Detuning <a href=\"https:\/\/cnbygele.com\/product\/cksg-series-low-voltage-series-reactors\/\">series reactors<\/a> with capacitor banks shifts resonance away from dominant harmonic orders in some designs.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Neutral conductors in systems with triplen harmonics may carry higher current\u2014verify conductor sizing during design.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Capture nameplate data, single-line drawings, and utility interconnection rules in the RFQ package to reduce back-and-forth during technical review.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">If your site mixes linear motors and nonlinear electronics, treat harmonic and reactive targets as linked requirements rather than separate purchases.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Define acceptance criteria before shipment\u2014power factor, step response, or THD at agreed load points\u2014so commissioning disputes are less likely.<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:0 0 20px;\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">Risk signal<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">Design response<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">Verify at commissioning<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">5th harmonic dominant<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">p\u22487% detuning<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Thermal scan on reactors<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">3rd harmonic significant<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">p\u224814% detuning<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Capacitor voltage rise<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Frequent cap failures<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Harmonic study + detune<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Fuse and cell inspection<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Strict THD contract<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">APF or hybrid<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">PCC THD\/TDD readings<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure style=\"margin:26px 0;text-align:center;\"><img loading=\"lazy\" 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\/07\/preventing-capacitor-harmonic-resonance-in-industrial-systems-body.webp\" alt=\"capacitor harmonic resonance \u2014 CNBYG product in industrial power facility (illustrative)\" width=\"640\" height=\"360\"\/><\/figure>\n<h2 id=\"part-3-operating-and-maintenance-discipline\" style=\"margin:42px 0 14px;font-size:1.35em;line-height:1.3;\">Part 3. Operating and Maintenance Discipline<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Avoid ad-hoc capacitor steps without updating the single-line and protection review.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">When resonance symptoms return after load changes, re-measure before adding <a href=\"https:\/\/cnbygele.com\/product\/bsmjparallel-series-self-healing-low-voltage-parallel-capacitors\/\">capacitor modules<\/a>.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Harmonic studies should list major nonlinear loads, operating duty cycles, and future expansion plans.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Maintenance includes filter fuse checks, thermal inspection, and verification that filter settings still match load changes.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Contact <a href=\"https:\/\/cnbygele.com\/contact-us\/\">CNBYG<\/a> for application review when THD targets are contractual or utility-driven.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Capture nameplate data, single-line drawings, and utility interconnection rules in the RFQ package to reduce back-and-forth during technical review.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">If your site mixes linear motors and nonlinear electronics, treat harmonic and reactive targets as linked requirements rather than separate purchases.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Define acceptance criteria before shipment\u2014power factor, step response, or THD at agreed load points\u2014so commissioning disputes are less likely.<\/p>\n<div class=\"tip-box\" style=\"border-left:4px solid #2e7d32;background:#f3faf4;padding:12px 16px;margin:0 0 18px;line-height:1.7;\"><strong>Tip:<\/strong> Keep as-built single-line diagrams updated after any feeder changes.<\/div>\n<div class=\"warning-box\" style=\"border-left:4px solid #f9a825;background:#fffbf0;padding:12px 16px;margin:0 0 18px;line-height:1.7;\"><strong>Important:<\/strong> Energizing plain capacitor steps into a harmonic-rich feeder without detuning can accelerate failures within weeks.<\/div>\n<h2 id=\"part-4-documentation-and-handover-checklist\" style=\"margin:42px 0 14px;font-size:1.35em;line-height:1.3;\">Part 4. Documentation and Handover Checklist<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Industrial acceptance should not rely on energization alone\u2014documentation proves ratings, safety, and maintainability for the next maintenance cycle.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Use the tables below as a starting RFQ checklist; your utility or EPC contract may require additional items.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">For product-specific datasheets, cross-check <a href=\"https:\/\/cnbygele.com\/product\/cksg-series-low-voltage-series-reactors\/\">related CNBYG product pages<\/a> and request any missing type test excerpts.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Align factory acceptance tests with items your insurer or utility interconnection agreement may require.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">When comparing quotations, normalize currency, Incoterms, and included commissioning services before ranking suppliers.<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:0 0 20px;\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">Document \/ item<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">Purpose<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">When to request<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Factory type test report<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Verify rated voltage, kvar, and temperature rise<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Before purchase order<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Single-line diagram template<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Panel layout and protection coordination<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Design phase<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Communication register map<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">BMS\/SCADA integration<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Before FAT\/SAT<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Spare parts list (5+ year)<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Lifecycle planning<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Contract negotiation<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Commissioning checklist<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Acceptance testing<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Before energization<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table style=\"width:100%;border-collapse:collapse;margin:0 0 20px;\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">Load type<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">Typical THD concern<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">Mitigation note<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Variable frequency drives<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">5th\/7th\/11th harmonics<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">APF or tuned passive filters per study<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">UPS \/ rectifier front-ends<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Broadband distortion<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Verify neutral loading in 3-phase systems<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">LED \/ SMPS clusters<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">High-frequency content<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Check aggregate current at PCC<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Legacy motor loads<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Lower harmonic share<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Reactive compensation may be primary need<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"tip-box\" style=\"border-left:4px solid #2e7d32;background:#f3faf4;padding:12px 16px;margin:0 0 18px;line-height:1.7;\"><strong>Tip:<\/strong> Store factory test reports with the panel serial number for future warranty claims.<\/div>\n<div class=\"tip-box\" style=\"border-left:4px solid #2e7d32;background:#f3faf4;padding:12px 16px;margin:0 0 18px;line-height:1.7;\"><strong>Tip:<\/strong> Confirm imperial and metric dimensions if shipping to mixed-design sites.<\/div>\n<h2 id=\"part-5-commissioning-monitoring-and-long-term-op\" style=\"margin:42px 0 14px;font-size:1.35em;line-height:1.3;\">Part 5. Commissioning, Monitoring, and Long-Term Operations<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Commissioning should verify that reactive and harmonic targets are met at the point of common coupling, not only at the compensation cabinet terminals.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Functional tests typically include step response, power factor at defined load points, and harmonic readings compared to contract or IEEE 519 guidance where applicable.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Monitoring after energization helps catch hunting, unexpected resonance, or capacitor cell failures before they affect production uptime.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Train maintenance staff on lockout\/tagout, discharge timing for capacitors, and which alarms require immediate shutdown versus scheduled service.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Schedule a post-warranty review to reassess load changes\u2014production line upgrades often change compensation needs within three to five years.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Utility account managers can clarify whether PF adjustments affect demand charges only, energy charges, or both\u2014align KPIs before writing acceptance tests.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Keep a spare-parts criticality list (fuses, contactors, fan assemblies, control boards) based on lead time and production impact, not catalog defaults alone.<\/p>\n<div class=\"tip-box\" style=\"border-left:4px solid #2e7d32;background:#f3faf4;padding:12px 16px;margin:0 0 18px;line-height:1.7;\"><strong>Tip:<\/strong> Log baseline power quality measurements after commissioning for future troubleshooting comparisons.<\/div>\n<h2 style=\"margin:42px 0 14px;font-size:1.35em;line-height:1.3;\">Recommended CNBYG Products<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7;\">For project support, explore related product line, <a href=\"https:\/\/cnbygele.com\/blog\/power-quality-system-explained-components-benefits-and-applications\/\">power quality planning articles<\/a>, <a href=\"https:\/\/cnbygele.com\/oem-odm\/\">OEM\/ODM programs<\/a>, <a href=\"https:\/\/cnbygele.com\/about-us\/\">about CNBYG<\/a> on cnbygele.com.<\/p>\n<figure style=\"margin:26px 0;text-align:center;\"><img loading=\"lazy\" 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\/07\/preventing-capacitor-harmonic-resonance-in-industrial-systems-product.webp\" alt=\"CNBYG reactor product recommendation (illustrative scene)\" width=\"640\" height=\"360\"\/><\/figure>\n<p style=\"margin:0 0 16px;line-height:1.7;\"><strong>Ready to discuss your project?<\/strong> Contact <a href=\"https:\/\/cnbygele.com\/contact-us\/\">CNBYG engineering contact<\/a> with your voltage class, load list, and target power factor or THD goals.<\/p>\n<h2 style=\"margin:42px 0 14px;font-size:1.35em;line-height:1.3;\">FAQ<\/h2>\n<h3 style=\"margin:28px 0 10px;font-size:1.15em;line-height:1.35;\">What causes capacitor harmonic resonance?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Capacitor steps with system inductance create a parallel resonant circuit. When its frequency is near a dominant harmonic, the branch draws amplified harmonic current.<\/p>\n<h3 style=\"margin:28px 0 10px;font-size:1.15em;line-height:1.35;\">How do detuned reactors prevent resonance?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Series reactors increase branch inductance and shift the resonant frequency below typical dominant harmonics so the bank remains inductive at those orders.<\/p>\n<h3 style=\"margin:28px 0 10px;font-size:1.15em;line-height:1.35;\">What detuning factor should I use?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7;\">p\u22487% is common for 5th-dominant systems; p\u224814% when 3rd harmonic is significant\u2014confirm with a harmonic study and system frequency.<\/p>\n<h3 style=\"margin:28px 0 10px;font-size:1.15em;line-height:1.35;\">What are signs of resonance in a capacitor bank?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Repeated fuse operations, capacitor case bulging, reactor overheating, or rising THD after adding steps without study.<\/p>\n<h3 style=\"margin:28px 0 10px;font-size:1.15em;line-height:1.35;\">Should I add capacitors if my plant has many VFDs?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Only after a harmonic study; plain capacitors may worsen distortion unless properly detuned or paired with active mitigation.<\/p>\n<h3 style=\"margin:28px 0 10px;font-size:1.15em;line-height:1.35;\">How does IEEE 519 relate to capacitor bank design?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7;\">It defines harmonic limits at the PCC; resonance can push voltage and current harmonics above limits even when real power factor looks acceptable.<\/p>\n<h2 style=\"margin:42px 0 14px;font-size:1.35em;line-height:1.3;\">References<\/h2>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7;\">\n<li><a href=\"https:\/\/circutor.com\/en\/articles\/can-any-capacitor-bank-with-filters-be-used-for-power-factor-correction-in-networks-affected-by-harmonics\/\" rel=\"nofollow noopener\" target=\"_blank\">CIRCUTOR \u2014 Detuned filters in harmonic networks<\/a><\/li>\n<li><a href=\"https:\/\/mccpanels.com\/knowledge\/capacitor-bank-sizing\" rel=\"nofollow noopener\" target=\"_blank\">MCC Panels \u2014 Capacitor bank sizing &#038; detuning<\/a><\/li>\n<li><a href=\"https:\/\/standards.ieee.org\/ieee\/519\/5488\/\" rel=\"nofollow noopener\" target=\"_blank\">IEEE Std 519 \u2014 Harmonic control<\/a><\/li>\n<li><a href=\"https:\/\/www.sourcebyspec.com\/encyclopedia\/reactive-power-compensation.html\" rel=\"nofollow noopener\" target=\"_blank\">SpecForge \u2014 Reactive power compensation<\/a><\/li>\n<\/ul>\n<\/div>\n<p><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What causes capacitor harmonic resonance?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Capacitor steps with system inductance create a parallel resonant circuit. 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