Unable to Recharge the prepaid meter

Solution: Connectivity Check: Confirm the meter is successfully communicating with the server. Serial Number Verification (SmartComm): Access the SmartComm Customer Master and ensure the serial number recorded matches the physical serial number of the connected meter. Duplicate Configuration Check: Verify that no two meters are incorrectly configured with the exact same serial number in the system.

Email Configuration SMTP Details Outlook

Solution: SMTP Host/Server Name: For Outlook.com: smtp-mail.outlook.com For Office 365/Microsoft 365: smtp.office365.com SMTP Port:587 (recommended) Encryption Method: STARTTLS Authentication: Your email account needs to be authenticated, so enable login or use the ""My outgoing server (SMTP) requires authentication"" option in your email client. Username: Your full Outlook email address (e.g., yourname@outlook.com or yourname@domain.com) Password: Blank

Email Configuration App Password creation for Gmail account

Reason - Gmail will work only with a secure encrypted app password Solution: Go to your Google Account settings. Navigate to the Security tab. If you don't have it enabled, turn on Two-Step Verification. Find and click on App passwords. Select an app name (like ""SMTP"" or ""Mail Client"") and click Generate. Copy the generated 16-character password and use it in your mail client's password field instead of your main Gmail password.

Email Configuration SMTP Details Gmail

Solution: Gmail SMTP Settings SMTP Server: smtp.gmail.com Port: 587: (requires STARTTLS/TLS) 465: (requires SSL) Authentication: Required Username: Your full Gmail address (e.g., user@gmail.com) Password: An App Password generated from your Google Account security settings Security/Connection: TLS or SSL, depending on the port chosen

Transfer existing sensor to a different gateway

Reason - Loss of old data stored under device id created Solution: To prevent data loss, edit the sensor and use the "Move to Gateway" option to transfer the sensor to a different gateway.

Asset list is not available in the filter

Reason - The asset is not assigned to the organization Solution: Check the asset selection settings in organization settings

Reason - Sensor/gateway limit exceeded Solution: Check license information for sensor/gateway limit

Cannot change the ip address of gateway

Reason - The ip address should is not available Solution: 1. if company network is being used check the accesibility to access 2. check if set ip is with in subnet range 3. Check if Primary and Secondary DNS is correct as per network settings 4. Set the Default Gateway IP to match the router's IP or the company network's default gateway IP.

3rd part meter not communication

Reason - 1. Memory map configuration wrong 2. (10 power -4 )Conversion factor is not available in third party memory map configuration 3. Data on modscan and software is matching but not matching with meter display readings Solution: 1. Verify data via Modscan, check wiring, confirm the meter parameter's datatype/function code in the memory map, and ensure the gateway supports that parameter datatype. 2. Can be added from conversion factor available in Master settings

Could not download certificate

Reason - All mandatory fields are not saved in organisation info settings Solution: All details should be given in mandatory field of organisation settings

Triplen harmonic mitigation

Updated: Sep 08, 2026 | 6 min read

Technical Articles

Published: Jul 14, 2026 by Abhinav L Purkar

Technical Articles

01 What is Star Delta Starter?

02 How Does a Star Delta Starter Work?

03 Types of Star Delta Starter

04 Application of Star Delta Starter

05 How to Connect Star Delta Starter?

06 Benefits of Busbar Trunking System

07 Advantages and Disadvantages of Star Delta Starter

08 Disadvantages of Star Delta Starter

09 Where Star Delta Starter is Used?

11 FAQs About Star Delta Starter Guide

12 What Is VFD in Electrical Systems?

13 How Does a VFD Work?

14 VFD Working Principle Explained Simply

15 Why VFD Drives Are Widely Used Today

16 Types of VFD Commonly Used

17 VFD Components and Their Roles

18 Advantages of Variable Frequency Drive

19 Variable Frequency Drive Installation Considerations

20 VFD Drives and Motor Protection

21 VFD Maintenance Checklist Basics

22 Why VFD Maintenance Is Often Overlooked

23 Final Perspective

24 FAQs About Understanding Variable Frequency Drives

25 What is MCC Panel in Electrical?

26 What is PCC Panel in Electrical?

27 MCC Panel Working

28 PCC Panel Working

29 MCC Panel Components

30 PCC Panel Components

31 Types of MCC Panel

32 Types of PCC Panel

37 How our SmartComm EMS

39 What is an Overcurrent Relay 

40 Types of Overcurrent Relays

41 Overcurrent Relay Working Principle

42 Applications of an Overcurrent Relay

43 How to Set an Overcurrent Relay

44 FAQs Overcurrent Relay 

45 Who should do this and Why

46 Thermal management and Online Temperature monitoring - Steps overview

47 Step #1: Identifying the critical joints in a LV Panel

48 Step #2: Local Online Temperature Monitoring via HMI

49 Step #3: Action Plan for Anomaly detection

52 Sources of triplen harmonics

53 Triplen harmonic mitigation using passive elements

57 Power quality study

58 Level 1 solution – High V-THD reactors

59 Level 2 solution - Active harmonic filter

62 What is RCD in Electrical

63 Types of Residual Current Device

64 How Does an RCD Work

65 Applications of an RCD

Click on any topic to jump to that section

Triplen harmonics have frequencies with the multiple of 3, like 3rd harmonic (150 Hz), 9th harmonic (450 Hz), 15th harmonic (750 Hz) and so on. These harmonics have some peculiar characteristics, hence very difficult to handle and mitigate. This article explains about the basics, sources, effects and mitigation techniques of triplen harmonics.

Sources of triplen harmonics

Triplen harmonics are usually generated by single phase non-linear loads that share common neutral. Some of them are,

SPMS in computers, televisions, etc.,
CFL lamps
Electronic dimmers and so on

These types of loads are common in IT parks, office, hospital and other commercial buildings. Following are the typical current harmonic spectrum of SMPS and CFL lamps, where the third harmonic is predominantly high.

All the triplen harmonics are zero sequence in nature and they are exactly in-phase in all the three phases. Whereas the fundamental component (50 Hz) has positive phase sequence and the phases are displaced by 120° between the three phases.

Neutral current is the vector sum of all the three phases (120° phase displaced) and the sum is zero, if the loads are balanced in all the three phases. But the presence of triplen harmonics will result in the flow of neutral current, even if the loads are balanced. This phenomenon explained below:

The accumulated neutral current, because of the additive triplen current, can go up to 200% of the phase current.

Ill effects of triplen harmonics:

Neutral over-loading results in hot neutral or neutral burning. So unnecessary increase in the size of neutral would be required.
Distribution transformer over heating
Busbars and cable overheating due to skin effect
Eddy current losses (as eddy current is proportional to square of the frequency)
Reduced life of electrical equipments like transformers, power capacitors, switchgear, etc.

Triplen harmonic mitigation using passive elements

1. Detuned passive filter

Most commonly used passive filter for triplen harmonics is 14% detuned filter. This filter has the tuning frequency of 133 Hz, which is below the 3rd harmonic (150 Hz). This filter is very effective in averting the harmonic amplification caused because of 3rd harmonics & above and thereby protecting power capacitors and other equipments. But detuned filter will not eliminate the harmonics completely.

2. Zig-zag transformers (inter connected star connection)

Ideally zig-zag transformers (or chokes) are used for generating neutral point in three phase three wire systems. The generated neutral point in the transformer helps in trapping the zero sequence currents (triplen harmonics and earth fault current). The zig-zag winding connection is shown in the below figure:

The zigzag transformer contains six coils on three cores/limbs. Each limb carries two windings, similar to primary and secondary. The first coil on each core is connected contrarily to the second coil on the previous/next core. The second coils are then all tied together to form the neutral and the phases are connected to the primary coils.

If three currents, equal in magnitude but 120° out of phase with each other, are applied to the three terminals, the ampere-turns in the windings cannot cancel and the transformer restricts the current flow to the negligible level of magnetizing current. Therefore, the zigzag winding provides an easy path for in- phase currents (triplen harmonics) but does not allow the flow of currents that are 120°out of phase with each other.

The zig-zag transformers are relatively smaller in size and can be installed close to the group of single phase loads that generate triplen harmonics. These transformers are more effective during balanced load condition. Thus the harmonics are trapped at the source and neutral overloading can be avoided.

These two are cost-effective & safe solutions for triplen harmonics mitigation. However, detuned filter or zig-zag transformers do not eliminate the harmonics completely. In order to achieve that, active harmonic filters with three-phase four-wire configuration should be used.

About the Author

Abhinav L Purkar,

Manager Product Management & Marketing (PMM)

Abhinav Purkar is a Product Management, Marketing, and Application Engineering professional with over 10 years of experience in the Power Quality domain. He has extensive expertise in power quality analysis, harmonic mitigation, reactive power compensation, energy efficiency, and electrical system optimization, helping customers improve system reliability and operational performance. With proven experience in product lifecycle management, market development, portfolio growth, and go-to-market strategy, Abhinav has successfully driven initiatives that enhance customer value and strengthen market presence. His strong technical foundation, combined with strategic business acumen, enables him to bridge the gap between customer requirements and innovative product offerings.