FULL COMMISSIONING AND PRELIMINARY DIAGNOSTICS BEFORE APPLYING MEDIUM VOLTAGE
01 / 12 / 2020 7659 Views
  • Products
  • Services

As we mentioned earlier (read the article on the 14 advantages of Triol AT27 here)100% of the VFD elements can be tested with low voltage, which, in case of installation errors or other malfunctions, will not lead to a VFD failure.

The AT27 VFD series provides the possibility of mandatory full diagnostics and complete commissioning without load and medium voltage supply.

This solution favorably distinguishes AT27 from other VFDs of this voltage class.

Manufacturers of medium voltage VFDs aim at realizing the full diagnostic capabilities of equipment before connecting to the main. However, only Triol AT27 provides the ability to diagnose and test the operation of the product completely without applying medium voltage. Medium voltage supply can bear the risks involved with possible installation and commissioning failures.

With Triol AT27 this problem is solved in such a way that the installer can perform 100% of the commissioning and complete equipment diagnostics without medium voltage supply. Such a technical solution in the basic configuration of AT27 makes the VFD a 100% predictable element of the system when commissioning complex objects.

HOW THIS IS IMPLEMENTED

Obviously, you cannot perform the full scope of commissioning and complete diagnostics without medium voltage supply. A product or system is considered to be fault-free and ready for use if all components are in good operating order. Triol Corporation has solved the problem of testing Triol AT27 before supplying the mains voltage by artificially creating a medium voltage on all AT27 power components that require testing. In this case, the medium voltage is obtained from a source of auxiliaries of limited power. For this we use power supplies with parameters:

  • 3 phases 380 V, 7 - 35 kVA
  • 3 phases 480 V, 7 - 35 kVA (optional).

The power value of the auxiliary power supply depends on the rated power of the Triol AT27 and is determined by the manufacturer.

The thyristor regulator generates a medium voltage, which operates on the low-voltage winding of the power transformer.

In response to the power transformer, galvanic separation of high-voltage and low-voltage mains is ensured, which allows the creation of a medium voltage on AT27 components without being connected to the mains. It also opens up the possibility of diagnosing such AT27 components as:

  • power multi-winding transformer;
  • power cells (rectifier and IGBT inverter);
  • medium voltage measuring circuits.

WHAT BENEFITS DOES THIS BRING TO THE USER?

The proposed solution allows the user at each start to:

  • make sure that all components and systems are in good operating order before supplying medium voltage from the mains;
  • make sure that all power cells and the inverter as a whole are operating at idle (without load); ,
  • avoid irreversible damage to the power windings of the transformer with the development of insulation breakdown in the areas of the damaged winding;
  • avoid irreversible damage to power cells during the propagation of emergency processes in them during the first start-up;
  • avoid a fire in the AT27 power unit in case of any malfunctions.

The limited power of the power source doesn’t allow the sustained progressing of failures, accompanied by arc discharges, melting of insulation and current-carrying power mains, and the occurrence of fires. This function makes diagnostics safe and the VFD quickly recoverable even in case of a local fault.

Full diagnostics of the Triol AT27 before the medium voltage is supplied allows the user to save the equipment from being put into operation, saving time and money in the event of failures during commissioning, either due to the fault of any equipment, or due to personnel making mistakes during installation and commissioning.

HOW IS IT DONE?

The main component responsible for the safe diagnosis of the medium voltage components of the AT27 is the power cell pre-charge system. This system is built on the basis of a thyristor regulator powered by an auxiliary voltage source protected from emergency processes by a circuit breaker.

The pre-charge system can operate both in automatic and manual mode.

Functional diagram of the power cells pre-charge system.

This system is an original, patented solution of Triol Corporation (application 2020124674 dated 07.24.2020), the essence of which is as follows: In automatic mode

  • After the “Start” command is received, the KM1 contactor is switched on, supplying 0.4 kV power to the thyristor regulator, the output of which is connected to the auxiliary winding.
  • On the windings of the 0.7 kV power transformer, the voltage gradually increases, which charges the DC link capacitors installed in the power cells. The thyristor regulator current sensor unit controls the capacitor charging current.

The charging time of the capacitors depends on the power of the VFD and on the set charging current, which ranges from 5 to 40 A.

In the process of pre-charging, the AT27 control system constantly monitors the state of the power cells. After reaching an operating voltage of about 1000 V on the capacitors, the KM1 contactor is switched off and the Q1 switching device – a vacuum switch or a contactor that supplies voltage to the VFD – is turned on. Furthermore, the inverter of the VFD starts with the formation of the output voltage and frequency.

In manual mode To diagnose the operability of the power cells, we offer a manual mode to set the voltage value in the AT27 power cells ("Angle test"). In this case, the user can controllably increase the voltage in the DC link of the power cells by changing the value of the thyristor firing angle . At the same time, it is possible to evaluate the status of each power cell online as the voltage increases according to the information displayed by the controller UMKA. Such functionality of the Triol AT27 allows detection of a malfunction in a power cell at reduced voltage, without leading to the development of an emergency.

Another great quality of the pre-charge system that we talked about in this article is the ability to limit the starting current of the AT27. Thanks to the pre-charged capacitors of the power cells, at the moment of connecting to the main, the starting current through the mains winding of the power transformer and through the rectifiers of the AT27 power cells is limited. This useful property not only allows the life of the VFD’s power components to be extended, but also avoids false triggering of the relay or microprocessor protection of the switchgear, followed by its shutdown.

WHAT IS THE FUNDAMENTAL DIFFERENCE BETWEEN TRIOL’S TECHNICAL SOLUTION AND ITS COMPETITORS’?

Our philosophy of building reliable and safe solutions in the field of variable frequency drives involves solving the two problems of Safety and Reliability at the same time. We have implemented more than just an inrush current limiter, which is found in the following VFDs: ABB, TMEIC, Danfoss, WEG, Hiconics. We have implemented a pre-start diagnostics system for the power section of the VFD and an inrush current limiter at the same time! This is the crucial , fundamental difference of our technical solution in comparison with the technical solutions of other manufacturers! How the AT27 protects the motor, how motor protections are implemented, and what we think about the differential protection of powerful electric motors powered by VFD, we will tell in a future publication.

Our next publication will be devoted to how to implement optimal solutions for integrating the AT27 into the enterprise infrastructure in terms of connecting to the power supply sections of the switchgear and to the customer's load.

close
АТ24 all regions 15.06
Triol Corporation
Triol AT24 Series: intellectual universal unique ultra-adaptive low-voltage drive (IUUU LV Drive).

Meet lines of Industrial Low Voltage VFDs AT24 Triol that are ready for order in Q3 2023!

Triol AT24 line UC

Upgrade your industrial processes with the intelligent Triol AT24 line UC Variable Frequency Drive (VFD). Experience high overload capability, precise frequency control, and increased control accuracy with the support of three encoder types. Enhance your system performance and efficiency today!

Learn more
Triol AT24 line UH

Optimize your operations in harsh environments with the Triol AT24 line UH Variable Frequency Drive (VFD). With its high-protective enclosure and separate airflow cooling channel, it's built to withstand extreme conditions. Experience reliable performance from -40 ºC to +50 ºC (-40...+122 F) and install it outdoors with confidence. Upgrade your system today for enhanced durability and efficiency!

Learn more
Frequency Drive AT24 line LE by Triol

Ensure the safe and reliable operation of elevator equipment with the Variable Frequency Drive AT24 line LE by Triol. Designed for synchronous and asynchronous, gear and gearless elevator winches, it offers advanced functionality and unique algorithms for modern elevators. Benefit from automatic measurements, easy configuration via Wi-Fi adapter and Triol Wizard, and reliable power supply with UPS operation. Upgrade your elevator system with Triol AT24 VFD line LE for enhanced performance and control.

Learn more

About Applications of LV AT24 VFD in different industries

Videos

Increase the profitability of rolled steel production with the specialized Triol AT24 VFD functions.

Learn in this video how to increase the profitability of rolled steel production with the specialized Triol AT24 VFD functions.

Learn more
Algorithm AT24 for controlling Sucker Rod Pump

Supercharge your Sucker Rod Pump operations with the cutting-edge AT24 algorithm.

Learn more
Improving the control efficiency of shipboard electric motors by implementing Triol VFD

Triol Corporation's AT24 and AT27 VFDs are cutting-edge solutions designed specifically for marine applications.

Learn more

Contacts

Dmitry Khachaturov

Dmitry Khachaturov Junior

Key Account Manager

Europe

dmitry.khachaturov.j@triolcorp.com

Nikita Poturoev

Nikita Poturoev

Head of Sales Department

Europe

n.r.poturoev@triolcorp.com

Discover new horizons with Triol equipment! 

close
Польша 30.05.23
Triol

Triol - Poland is gaining momentum!

We invite you to visit our new facilities in Poland!


Triol extends a warm welcome to our esteemed partners and new customers.

Dmitry Khachaturov
quote

Dmitry Khachaturov 

Junior

dmitry.khachaturov.j@triolcorp.com

PRODUCTION PROGRESS 

Availability of manufacturing:

  • Variable Speed Drive AK06 - 150 machines per month

  • Low Voltage VFDrive АТ24
    UC/UH line
    - 300 machines per month. 
    RT line - 100 machines per month. 
    MP line - 10 machines per month. 
    SD line - 30 machines per month

  • Downhole Measuring System TM01 - 50 machines per month

  • Medium Voltage Variable Frequency Drive AT27 - 10 machines per month

Poland
Video

Revolutionizing Offshore Electrical Equipment: E-Cabinet!

Available to order already!

Revolutionizing Offshore Electrical Equipment: E-Cabinet!
Learn more

Linear Electric Submersible Pump - EP01

To be available for order in August 2023

EP-01
Video

Triol TM01 Downhole Measuring System

Available to order already!

Triol TM01 Downhole Measuring System
Video

AT24 Triol Variable Frequency Drive 

Available to order already!

AT24 Triol Variable Frequency Drive
Video
close
email Eu 09.05
Triol Corporation

microsoftteams-image-4

Ver el vídeo

Triol AT27 línea ED tiene las dimensiones más pequeñas entre los VDFs de su clase.

Noticias

Revolutionizing Offshore Electrical Equipment: The Story of E-Cabinet.

Revolucionando el Equipo Eléctrico en Alta Mar: La Historia de E-Cabinet.

Aprende más
Construction material makes a difference!

El material de construcción hace la diferencia! Los intercambiadores de calor Triol están fabricados en acero inoxidable.

Aprende más
Reduce the risk of equipment damage and improve the energy efficiency of your equipment with Triol patented solutions!

Reduzca el riesgo de daños en los equipos y mejore la eficiencia energética de sus equipos con las soluciones patentadas de Triol!

Aprende más

Vídeos

Znimok_ekrana_2023-07-05_o_14

Soluciones Triol para aplicaciones HVAC.


Aprende más
Znimok_ekrana_2023-07-05_o_14

Variador confiable de voltaje medio (DD) VDF AT27 para operación en ambientes cálidos y húmedos

Aprende más
E-cab1

¡En septiembre de 2022, Triol lanzó el nuevo catálogo de productos E-Cabinet!

Aprende más

Contactos

22
Magdalena Maria Jarocka
 
Gestor de grandes cuentas

LATAM

m.m.jarocka@triolcorp.com

¡Abra nuevos horizontes con los equipos Triol!

close
Польша 13.02.23
Triol

TRIOL IS BACK TO BUSINESS!

Come to visit our new facility in Poland. More than 10 loyal partners have already audited Triol's new plant. We are ready to meet your needs and process your orders!

Mladen Spiric

MLADEN SPIRIC

Business Development Manager

mladen.spiric@triolcorp.com

RELOCATION IN POLAND

  • The plant construction has already started in June 2022

  • The first machine was launched
in July 2022

  • First electronics unit were produced in August 2022

  • First shipment made in October 2022

Poland
Video
Workers

PRODUCTION DYNAMICS

Production
 dynamics
Video
Catalog

Email us to find out more about our product line

View catalogs
close
email Eu 09.05
Triol Corporation
Open the door to more projects with Triol's smallest footprint VFD!

 News

Revolutionizing Offshore Electrical Equipment: The Story of E-Cabinet.

Revolutionizing Offshore Electrical Equipment: The Story of E-Cabinet.

Learn more
Construction material makes a difference!

Construction material makes a difference!

Learn more
Reduce the risk of equipment damage and improve the energy efficiency of your equipment with Triol patented solutions!

Reduce the risk of equipment damage and improve the energy efficiency of your equipment with Triol patented solutions!

Learn more

Videos

AT27 VFD Triol perfect operates with all types of motor windings

AT27 VFD Triol perfect operates with all types of motor windings!

Learn more
Perfect transfer of the motors to the distorted mains. And transfer from the mains.

Perfect transfer of the motors to the distorted mains. And transfer from the mains.

Learn more
Ventilation reservation as a tool to improve reliability

Ventilation reservation as a tool to improve reliability

Learn more

Contacts

Vasiliy Kravtsov

Mladen Spiric

Business development manager

Asia Pacific

mladen.spiric@triolcorp.com

Work with Triol — sell knowledge!

close
email 13.03
Triol Corporation
Сomplete Triol solution for offshore platforms

Solutions 

Triol SKID – Save time while commissioning and increase the personnel’s safety and comfort!

Triol SKID – Save time while commissioning and increase the personnel’s safety and comfort!

Triol Skid - a versatile and compact solution designed to simplify the commissioning process and enhance safety and comfort for personnel working in industrial environments

Learn more
Triol E-Cabinet – A specialized compact unit for oil production on offshore platforms

Triol E-Cabinet – A specialized compact unit for oil production on offshore platforms

Triol E-Cabinet - is a specialized compact solution combining in minimal dimensions a step-down phase-shift transformer, a variable frequency drive, and an output step-up transformer.

Learn more
Marine frequency drive systems based on the Triol AT24 and Triol AT27

Marine frequency drive systems based on the Triol AT24 and Triol AT27

The Triol AT24 and AT27 VFDs for marine applications meets challenges such as compliance with standards and certificates, installation in limited space, stable operation in shipboard mains, and other conditions.

Learn more

News

Triol SKID – Save time while commissioning and increase the personnel’s safety and comfort!

New production facilities in Poland are equipped with modern painting equipment!

Learn more
Great alternative for the transition of oil production on the low-flow well fund with a unique EP01

Great alternative for the transition of oil production on the low-flow well fund with a unique EP01

Learn more
Increase HPS performance with VSD AK06

Increase HPS performance with VSD AK06

Learn more

Contacts

Surmin_3

Nikolay Surmin

Business development manager

USA

n.surmin@triolcorp.com

Apply Triol equipment — work with professionals!