Return-Path: Delivered-To: shishir@banglamarkgroup.com Received: from server2.www.flokoin.com by server2.www.flokoin.com with LMTP id uMjBLyczbmkVyQYAB2Lfrw (envelope-from ) for ; Mon, 19 Jan 2026 13:35:35 +0000 Return-path: Envelope-to: shishir@banglamarkgroup.com Delivery-date: Mon, 19 Jan 2026 13:35:35 +0000 Received: from o1678952x239.outbound-mail.sendgrid.net ([167.89.52.239]:15948) by server2.www.flokoin.com with esmtps (TLS1.3) tls TLS_AES_128_GCM_SHA256 (Exim 4.99.1) (envelope-from ) id 1vhpPq-00000001rWA-2msu for shishir@banglamarkgroup.com; Mon, 19 Jan 2026 13:35:35 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=newzenler.com; h=list-unsubscribe:list-unsubscribe-post:list-id:from:subject: content-transfer-encoding:date:mime-version:reply-to:to:content-type:cc:content-type:date:from: subject:to; s=s1; bh=1K4Y88AkNA9q49NfOFBp47V+S5LUs6a+/coJlC6Zmjc=; b=Z9U6YOIgA1nKccgASlzuqd3gyn+Ik9Z+a1XbX1BxlR3SriKDG93v1uWWMiim8VpWzdCJ ewx0JxAhhpHvtnxRMuUYG+Z3vKUNHdz7EBBxo1l1K2ht53DBh+0ZGuEl6bANFrL49ZEMwD qml/0QTmT8uqmPPEaHciTLr8CL5v6q29BLMRbg27WOxq8Q1OWsjmlAOKvEiTtakOTgPxqd Is8Q4Q4fB+k8tqg1ApvvRw54rOuaRN4v6nnajVXjNjmy60O4MDWs3lnNOWNSksOhewF1mG /FD90NZr07tKFhTd0YDXm5J39leChqff36F9KBhwnE2Hf2/ulGTJqnvRnazz+OpA== Received: by recvd-56b4d87796-kp2xv with SMTP id recvd-56b4d87796-kp2xv-1-696E32FC-31 2026-01-19 13:34:52.740909008 +0000 UTC m=+2819003.594339523 Received: from ip-10-116-6-16.ec2.internal (unknown) by geopod-ismtpd-1 (SG) with ESMTP id H5pe6s_RT4-yB914VTjhfA for ; Mon, 19 Jan 2026 13:34:52.725 +0000 (UTC) List-Unsubscribe: =?us-ascii?Q?=3Chttps=3A=2F=2Fwww=2Epowerprojectstraining=2Ecom=2Fmail=2Funsubscribe=2FeyJhbG?= =?us-ascii?Q?ciOiJIUzI1NiIsInR5cCI6IkpXVCJ9=2EeyJ1c2Vy?= =?us-ascii?Q?X2lkIjoiMTMxMDcuNjdkNGZiNTNiMWQ3YyIsImV?= =?us-ascii?Q?tYWlsX3NlbmRfaWQiOiI2OTU3ODVjOTcxMmQ0Nm?= =?us-ascii?Q?JhMTMwNDJkNjIiLCJjYXRlZ29yeSI6MSwiY2F0Z?= =?us-ascii?Q?WdvcnlfaWQiOiIiLCJzY2hvb2xfdXJsIjoiaHR0?= =?us-ascii?Q?cHM6Ly93d3cucG93ZXJwcm9qZWN0c3RyYWluaW5?= =?us-ascii?Q?nLmNvbSIsInNjaG9vbF9pZCI6MTMxMDcsImlhdC?= =?us-ascii?Q?I6MTc2ODgyOTY5Mn0=2EySEZU3qF7U7ZMbI94dSp9?= =?us-ascii?Q?WtM1YYchfz2j6tHoOd=5FqI4=3E=2C?= List-Unsubscribe-Post: List-Unsubscribe=One-Click List-ID: the 'https://www.powerprojectstraining.com' via Email Broadcasting From: Selvakumar Subject: Case Study #6: Power System Safety in Industrial Network with VFDs and Large Motors Message-ID: <02af627f-357d-7146-1344-42ab3f5e540c@powerprojectsindia.com> Content-Transfer-Encoding: quoted-printable Date: Mon, 19 Jan 2026 13:34:52 +0000 (UTC) MIME-Version: 1.0 Reply-To: selvakumar@powerprojectsindia.com X-SG-EID: =?us-ascii?Q?u001=2EcKjL+JRDAQ6syzs3DUgW7jzKWwJ7mAeyrSA21MGpnu6x6pVoBTwfoYzm0?= =?us-ascii?Q?79yZnSzo58o8hou7BLMnruxQNe0zgx0gP=2FSEJST?= =?us-ascii?Q?JUOK2TCEv+06+=2FT0wKM6FiYq30sefVP4aZivexc?= =?us-ascii?Q?n=2FrREJUtYS0j2OhTuK0VwM6+ljup0vgynJT8MWw?= =?us-ascii?Q?7mEYDdZ6OZyrlvcakYwziHEO7XQWQzuPoxQMqAS?= =?us-ascii?Q?2ijfNedeIMntoxoQL2=2FJOKbIfUKeFidLJdqC+LF?= =?us-ascii?Q?LplPIAppUgbUi964UWxvRmeGlw=3D=3D?= To: shishir@banglamarkgroup.com X-Entity-ID: u001.sv/2PJNoaDOr/V28MEjImg== Content-Type: text/html; charset=utf-8 X-Spam-Status: No, score=0.1 X-Spam-Score: 1 X-Spam-Bar: / X-Ham-Report: Spam detection software, running on the system "server2.www.flokoin.com", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see root\@localhost for details. Content preview: Text Visit Website Content analysis details: (0.1 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 URIBL_BLOCKED ADMINISTRATOR NOTICE: The query to URIBL was blocked. See http://wiki.apache.org/spamassassin/DnsBlocklists#dnsbl-block for more information. [URI: zrlnk.com] [URI: amazonaws.com] [URI: fonts.googleapis.com] [URI: u20558582.ct.sendgrid.net] [URI: newzenler.com] 0.0 RCVD_IN_VALIDITY_CERTIFIED_BLOCKED RBL: ADMINISTRATOR NOTICE: The query to Validity was blocked. See https://knowledge.validity.com/hc/en-us/articles/20961730681243 for more information. [167.89.52.239 listed in sa-trusted.bondedsender.org] 0.0 RCVD_IN_VALIDITY_RPBL_BLOCKED RBL: ADMINISTRATOR NOTICE: The query to Validity was blocked. See https://knowledge.validity.com/hc/en-us/articles/20961730681243 for more information. [167.89.52.239 listed in bl.score.senderscore.com] 0.0 RCVD_IN_VALIDITY_SAFE_BLOCKED RBL: ADMINISTRATOR NOTICE: The query to Validity was blocked. See https://knowledge.validity.com/hc/en-us/articles/20961730681243 for more information. [167.89.52.239 listed in sa-accredit.habeas.com] -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.0 RCVD_IN_MSPIKE_H2 RBL: Average reputation (+2) [167.89.52.239 listed in wl.mailspike.net] 0.0 HEADER_FROM_DIFFERENT_DOMAINS From and EnvelopeFrom 2nd level mail domains are different 0.1 MIME_HTML_ONLY BODY: Message only has text/html MIME parts 0.0 HTML_MESSAGE BODY: HTML included in message X-Spam-Flag: NO Text
=
<= span style=3D"display: inline-block; font-size: 0px; line-height: 0; vertic= al-align: top;" class=3D"">

Visit Website

=
How Do You Ensure Power System Safety in an= Industrial Network with VFDs and Large Motors?

Here=E2=80=99s how we helped a large indus= trial facility safeguard its 6.6=E2=80=AFkV and 0.415=E2=80=AFkV power netw= ork, ensuring safe motor starting, harmonic compliance, and reliable protec= tion coordination in a system loaded with VFDs, transformers, and dynamic s= witching conditions. 

In mode= rn plants, power networks are no longer static. Multiple configurations, VF= D-driven loads, and large motors demand more than default safety margins. T= his project was a classic example of how assumptions can miss critical gaps= in protection, performance, and compliance. 

 

Challenge=E2=80=99s they faced:

The facility faced oper= ational risks across three electrical configurations: 
=F0=9F=94=B8= 6.6=E2=80=AFkV switchgear was underrated for actual fault levels 
= =F0=9F=94=B8Concerns over voltage dips during large motor starting =
=F0=9F=94=B8Harmonic di= stortion due to VFDs could impact compliance 
=F0=9F=94=B8Protectio= n coordination across MV and LV levels had not been validated <= /p>
 
 
 

Solution

We conducted a detailed= power system study using ETAP 22.5, covering: 
=E2=9C=85= Load Flow Analysis =E2=80=93 Simulated three switching scenarios and ve= rified performance across critical buses 
=E2=9C=85Short Circuit= Study =E2=80=93 Identified mismatch between fault current and 6.6=E2= =80=AFkV breaker capacity 
=E2=9C=85Motor Starting Simulation =E2=80=93 Confirmed that moto= r starting voltages remained above 96%, ensuring no instability
=E2=9C= =85Protection Coordination =E2=80=93 Developed and fine-tuned relay = settings with TCC curves 
=E2=9C=85Harmonic Analysis =E2=80= =93 Verified that THD and individual harmonics were within IEEE 519-2022 li= mits, even under VFD load 

= <= /table>
 
 
 

As a Result

 

=E2=9C=85Switchgear upgrade recommendations based = on verified fault levels
=E2=9C=85No motor starting concerns, valid= ated through dynamic voltage studies
=E2=9C=85Protection schemes co= nfirmed for fast, selective fault isolation
=E2=9C=85Harmonic perfo= rmance well within limits=E2=80=94no filter installation required

 

This project is a reminder that safety doesn=E2=80=99t lie in installed= hardware=E2=80=94but in what that hardware has been designed and tested to= handle. That=E2=80=99s what makes system studies not just necessary, but b= usiness-critical.

 
 
 

If you need s= upport on Power System Studies Consulting using Softwares like ETAP, DIgSIL= ENT PowerFactory, PSSE, CDEGS and PSCAD. 

  <= a href=3D"https://u20558582.ct.sendgrid.net/ls/click?upn=3Du001.kDQ00p1ALQC= DNDtnkt-2F95FyyhApqPJxmtYV6ZIuzsfMBJI0SE33906-2FY6j2FDmtHNhEJI1s4wf-2BH4sxN= Ty855ITtQu3kk-2BVZEJNL4a33xQByNyHQrVeJQeUvlsuI2wQiBkWZf-2BMo1ERkjLOmUIKzhzO= g27RrsllzKdOQcfCfgUsBYc0FUVl-2BJ5N82G2SthezJ7js0daKuhGe0tqqt-2Bi2P83P2kQlYO= yWilK59Kobi8Jh-2BdTlTFDQ9kdeAA6QIzeKWwkVgkDYv8382WazrNSAD2yQ0C9Vy5IPVR-2Bu1= xJoNRkUpbnl8pz63t21ZPeDM2GZ9JiT_Bm32iNVwLSBqepT5pYInCKyohIjbrMrMpbDKmbdWerN= lGJejWVsYllqCPaQGXGqsjfKduHvsf21XZCyIUENLiQdmEQmkDdBoBlQawPOUgsF6nAZ52mIGg0= pzkg-2BpFlqowjiRYwaGZ9sb6gHrPgp6MQXh16aqFwjxKOcZ1b7nh-2FspS27yHZ9JTm1iJYPYM= ESxfPy70zhROLfgzyuMAK1-2BAQ-3D-3D">3D"=  3D"YouTube"

Mailing Address : PowerProjects, 4/499, Vinobha Nagar, Koduvai, = Tirupur 638660, Tirupur, Tamilnadu, India, 638660

Unsubscribe

= 3D""=