Iron and Steel Industry

This company is represented by Dr. Alberto Fragiacomo, graduated in Physics.

He deeply knows the theoretical criteria of an SVC system and gives a support

with measures to improve and optimize the system.

He has a significant experience in High voltage/Medium voltage/ PFC and SVC systems planning having experience of detailed engineering and tests/measurements, and commissioning regarding these kind of plants.

References & Work Experience:

Networks Analysis :

ØPower flows

ØShort circuit currents

ØHarmonic currents flow

ØPower systems & protections

ØTransient stability:

•Electromechanical

•Electromagnetic

ØElectric circuits transients analysis

ØElectric arc

Power transformers

ØPower generators

Example of load flow and short circuit current calculation resulting from our software

Design of:

ØCalculation and technical specifications starting from furnace basic data

ØStatic var compensators

ØPower compensation harmonic filters:

•Reactive power

•Capacitors bank

•Tuning reactors

•Damping resistor

•RC surge protections with arresters filters

for circuit breakers and medium voltage

ØSingle line diagram of SVC and drawing in steelmaking plants

ØSVC light/STATCOM with Voltage Source Capacitors power, if necessary for better disturbances compensation

Example of filters design performance calculation resulting from our software

Experience in design regarding:

ØOptimization of EAF/LF furnaces working with:

•SVC & SVC light Saturable reactor

•DC arc furnaces

•Synchronous machine for power generation

Measurements & Tests after SVC system installation

ØPower, energy

ØElectrical disturbances:

•Conducted and radiated

•Harmonics, flicker

•Voltage fluctuations

References & Work Experience:

SVC Calculation, Design, Test and Commissioning for Main Customers:

ØCONCAST

ØDANIELI & C.

ØFUCHS

ØSMS SIEMAG

ØTENOVA

ØTECHINT

ØVAI - Voest Alpine

ØABB

Design works in progress:

SIDERPOTENZA Italy SVC and measurements 105Mvar

DUFERCO Italy SVC and measurements 175Mvar

FERALPI Italy SVC 165Mvar

RUGUI Spain SVC 65Mvar

CHADORMALU Iran SVC 240Mvar or SVC-Light 115Mvar

RUGUI Spain SVC 50Mvar or STATCOM 18Mvar

SHADEGAN Iran SVC 190Mvar or SVC-Light 85Mvar

WEMES is a group of technicians who, uniting their experience and skills, provide technical and professional services to

develop both basic and detailed engineering design, in order to help your technical office in electrical, mechanical and civil engineering

works. WEMES working team has the potentiality and flexibility to offer a wide collaboration with your technical, commercial and purchase

departments in order to activate and manage a job complementary parts, that are:

1) Collaboration with project managers to estimate the engineering various parts, with the possibility of being present during technical meetings with final customer to give assistance and help

2) Assistance to designers and job responsible personnel in order to choose and define the best technical and economical solutions for machines or plant complementary parts

3) Assistance to the purchase offices by drawing up the documentation for inquiry request, checking and analysing the offer

4) Drawing up of all the engineering documentation for plant building

5) Co-operation during the assembly and erection, start up and testing of the plant

For the best time and energies management, our company’s praxis is to assign the works technical management to one of our

collaborators who acts as a connection with your personnel. He co-operate with your staff, choosing our most skilled and

appropriate personnel for every work that has to be carried out.

As a general and not restrictive rule, our structure is able to offer the above services with the following specializations:

ØElectric and automation installation works

HV-MV-LV apparatus and plant design

Basic and executive installation engineering

Use and maintenance manuals

Civil and tertiary plant engineering

Industrial/steel plant engineering

Assistance to erection and start-up on site

ØMechanical and piping works

Pneumatic, hydraulic and water engineering design

Carpentry and other structure design

Development of machine and plant piping with executive project

ØCivil works

Basic design

Feasibility studies

Plant layout

To carry-out the documentation, WEMES uses the most sophisticated technical means on the market, suitable to the

requirements/standardization of the Customer.

Activities and studies supplied for SVC systems and EAF furnaces engineering activities, for

a collaboration with suppliers:

ØStep down transformer

ØSeries reactor

ØVacuum circuit breaker

ØFurnace transformer

ØPFC: fixed harmonic filters, SVC

For the above mentioned activities we define:

ØApparatus technical specifications and dimensioning

ØTesting and commissioning in local suppliers’ factories

ØInstallation engineering with basic and detail design

ØSupervision to the installation works

ØTesting and commissioning after start up as listed in

“Systems check up on EAF and LF after SVC System installation” schedule

ØTechnical specifications for construction and enquiry

In order to Supply SVC Systems in Steelmaking plants, we supply technical specifications and detailed designs.

Check up of the Systems on EAF and LF Post SVC System installation

Check of furnace operation

ØInstallation of a measurement system for arc furnace analysing and operation reporting

ØCheck of typical heat performance in terms of heat profile, power input, current level, refractory balance, electrode consumption and further key factors for melting

Ø Setup of circle diagrams and operating tables

ØSubstation Supervision, Disturbances and Energy Control

Check of electrode regulation

ØCheck and calibration of current and voltage measurement

Ø• Check of closed-loop control for electrode regulation system

Ø• Hydraulic speed tests to analyse valve characteristic, accuracy, wear, mast roller performance.

Ø• Dip tests to establish high current system data

Ø• Discussion for improving hydraulic and control system

Check of electrical protection system

ØAnalysing VCB-breaker trips during opening (RC-Filter design with surge arresters)

ØRead-out and check relay settings for EAF-breaker and back-up breakers

ØAnalysing necessary protection level for transformer and switchgear, relay settings and coordination

Improvements operations

ØImplementation of modified Heat power profiles

ØTesting of new transformer/reactor taps and current levels (impedance set points) for different main melting phases

ØElectrical balancing of furnace operation in order to symmetrise and to lower refractory wear index

Examples of EAF/LF furnaces working optimization with SVC (Static Var Compensator).
Circle diagram for EAF working area

EAF with fixed filters EAF with SVC

Via Rossini 31/A, I-30171 Mestre-Venezia (VE), ITALY; Winter Local Time: GMT+1

Tel. : +39 041 8020015 ; Fax to email: +39 02 30132890

Mob.: +39 347 2618940 ; Email: wemes@wemes.it

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Update the: 31 ottobre 2011