happy holi-dhuleti -...
TRANSCRIPT
MARCH 2018
Automation
Training Calendar
Techno-Talk
Piyush Patel (Managing Director)
Customer’s Voice
Swami Vivekanand was traveling in a train, in a first class compartment. There were two British officers, traveling in the same compartment. Looking at his simple saffron clothes and thinking that he is a Sanyasi and does not know English, they started commenting. "These Sanyasies are parasites on our society, they do nothing and are simply a burden on us!" Swamiji kept his cool. After some time the train stopped. The station master, another British person, came to the train and
spotted Swamiji. They happened to know each other. "Oh, how are you Swamiji? Do you want anything?", asked the station-master looking respectfully at Swamiji. "Just a glass of water", replied Swamiji. The train started again. The two britishers were little embarrassed. "You know English", said one of them to Swamiji."Yes!" replied Swamiji ."That means you understood whatever we were saying about you. You had nothing to say?". Swamiji looked at them and said "It is not for the first time, that I met with fools!. Fools try to judge a person by his clothes and draw their own baseless conclusions!" Ashamed of themselves, the two Britishers apologized Swamiji and touched his feet.
High oltage V DCT HVDCransmission ( )
and armonics H
Digital excitation and control system
DECS-150
Aging Furnace Application
STALL NO : 8 HALL NO : H8B18 -Amtech Family
¨ Happy Holi-Dhuleti¨ Happy Cheti Chand¨ Happy Ram Navmi¨ Happy Mahavir Jayanti¨ Happy Good Friday
The test of a good coach is that when they leave, others
will carry on successfully
Shree Kumaran Alloys
TRAINING CALENDAR
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TECHNO-TALK
TITLE : HIGH VOLTAGE DC TRANSMISSION (HVDC) AND HARMONICS
Introduction :
High Voltage DC Transmission involves stepping up and rectification of the voltage to be transmitted, to convert it into high voltage DC and transmit it to a long distance of the order of hundreds of miles. At the receiving end the high voltage DC is inverted and stepped down to make it suitable for power distribution at the receiving end. This type of transmission has advantages of economy and efficiency at the same time it has side effects of harmonic generation. This paper gives the details of these advantages and also gives the methods of harmonic mitigation.
Historical back ground of HVDC transmission:
1950 : 116 km transmission line was commissioned between Moscow to Kasira at 200 V. k
1954 : The first commercial HVDC line was built with 98 m Submarine cable with ground return between island k
of Gotland and Swedish Mainland.
1972 : The Nelson River HVDC transmission line of 550 miles delivered electric power of 2500 MW, from Kettle
generating station to Winnipeg.
1990 : In India 1000 MW Rihand to Dadri HVDC line was commissioned.
1997 : The first application of DC distribution system in Sweden of HVDC is known as "HVDC light".
2000 : 600 V DC 785 transmission line in Brazil. k km
Advantages of High Voltage DC transmission:
1) HVDC is more efficient. This is because it is a DC transmission at high voltage which reduces the current and
hence the I²R losses.
2) Transmitter and receiver can operate at different frequencies this is advantageous in some countries like
J apan where part of the country works at 50 Hz and remaining works at 60 Hz.
3) Power flow can be in both the directions.
4) DC interconnection does not increase the maximum fault current in either AC systems.
5) Delivery of power is almost at unity power factor.
6) The power flow through HVDC transmission line can be regulated against line and load regulations.
Dis-advantages of HVDC transmission:
1) HVDC transmission generates harmonics when at transmission end AC power is rectified. At the receiving
the output of inverter needs to be filtered to get pure sine wave.
Effects of Harmonics:
1) Each transmission line has many natural resonant frequencies determined by its length, geometry and
termination. The input impedance of the transmission line can be closed to zero and resistive during series
resonance or infinitely large during parallel resonance at natural resonance frequencies. If a series
resonance frequency is close to any of the dominant harmonics generated by converter at transmission end
severe telephone interference is expected.
2) Current harmonics injected by converter on transmission side lead to voltage distortion.
3) Harmonics increase copper, iron and eddy current losses in transformers, motors and generators.
4) Power factor improvement capacitors are stressed due to high frequency voltage harmonics.
5) The fuses, switchgear and relays lead to premature failure/tripping causing shut downs of plants.
6) Harmonics also reduce effective power factor.
Mitigation of harmonics:
1) 3-phase converter gives total current distortion of nearly 62%. However, 12 pulse converter gives 8% total
harmonic distortion of current and 18 pulse converter result in further reduction in total harmonic distortion of
current by reducing it to less than 2%.
2) Passive harmonic filter and Active harmonic filter which are connected in shunt with the harmonics source
can reduce the current harmonics and can bring it within limits specified by IEEE 519:1992 standard.
Conclusion :
, If harmonics are taken care of HVDC transmission is the ideal power transmission over long distance.
DOC. NO. CS-263TITLE: ENERGY SAVING IN ID FAN
Payback period Approximately 8-10 Months
Industry : SteelApplication : anID FMotor rating : AC Induction Motor, 3 Phase - kW : 810 olt V : 3300 RPM : 741 Hz : 50 mp A : 188Previous system : Motor was running on DOL starter. Problem observed : 1) High maintenance cost. 2) Energy losses due to flow control by damper.Present system : 870 kW Axpert-Hivert Series Medium Voltage Drive used. kW (Consumption) Damper PositionPrevious system (Without drive) : 589 kW 80 % OpenPresent system (With drive ) : 341 kW 100 % OpenSystem block diagram :
Merits of new system : 1. Easy & Smooth Operation. 2. Energy Saving due to flow control by VFD.Economical analysis :
8Energy consumption without VFD - P1 = 589 kW 8Energy consumption with VFD - P2 = 341 kW 8Energy saving per day ((P1-P2) 24) = 5952 Units. x 8Saving per day @ Rs. 3/- Unit = Rs 17856/- . 8Saving per year (Approx. 300 Days) = Rs 53,56,800/- .
AXPERT-HIVERT MV DRIVE 810 kW, 3-PHASE INDUCTION MOTOR
3-PHASE,
3300 V,
AC SUPPLY
870 kWID FAN
AMTECH POWER VISION
5
Title: Digital excitation and control system DECS-150
Additional Features and Functions:
Ÿ Automatic voltage matching to the bus voltage when being paralleled
Ÿ Bumpless transfer between active and inactive modes of operation
Ÿ Integrated Power System Stabilizer (optional) • Allow for up to three (3) preposition settings
Limiter functions:
• Over excitation Limiting • Under excitation Limiting• Stator Current Limiting • Under frequency.
Protection :
• Loss of sensing • Generator over voltage • Generator under voltage • Generator over frequency
• Generator under frequency • Exciter eld over voltage • Exciter diode open detection • Exciter diode short detection • User
programmable protection • Syn-check Protection • Generator frequency Less than 10 Hertz • Congurable Protection
PC software:
Set up via PC using BESTCOM Plus Software and integrated PLC for Customizable logic
Password protection
Communication:
USB type B port (front or rear panel optional) Ethernet: RJ45 jack (rear panel) 10BASE- T/100BASE-TX (copper)
Diagnostics and event recording
Ÿ R • Oscillograph • Sequence of events record up to 1000 time.eal time monitoring
Physical requirements
• HMI Eleven (11) LED indicators will be located on the front of the unit and will indicate the following conditions :
• Manual Mode Active • Var/PF Active • Loss of Generator Sensing • OEL Active • UEL Active • Generator Over voltage • Over
excitation Shutdown • Under frequency Active • Exciter Field Current Limit • PSS Active* • Customer Alarm
FEATURES
General
A microprocessor based, high performance, digital excitation system ( ) will be DECS-150supplied to provide the required excitation to the exciter eld of a synchronous generator. The digital excitation system will provide controls, limiters, and protection for the generator as outlined below. The will use BESTCOM Plus® PC software to DECS-150monitor, control, and program the controlled parameters of the excitation system.
Inputs and Outputs:
Ÿ 63 V DC and 125 V DC @10 A DC pulse width modulated (PWM) Output
Ÿ Single or three phase voltage sensing with nominal inputs of 120 V AC, 240 V AC, 480 V AC, and 600 V AC.
Ÿ Single or three phase current sensing with nominal inputs of 1 A AC or 5 A AC.
Ÿ Eight (8) fully programmable digital inputs.
Ÿ Three (3) output contacts, two (2) of which will be fully programmable, capable of making, breaking, and carrying 7 A.
Ÿ Single or three phase power input accepting an input of 100 V AC to 277 V AC at 50 Hz to 500 Hz from generator line, PMG, or auxiliary winding.
Control Features:
Ÿ Automatic voltage regulator Mode with at least ±0.25% from no load to full load
Ÿ Integrated manual eld current regulator Mode.
Ÿ Integrated var/power factor controller Mode.
Ÿ PID Adjustments • Auto tuning • Parallel Operation • Reactive Droop Operation
Ÿ Line Drop Compensation.
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PRODUCT OVERVIEW
Aging Furnace Application:
Improved aluminum alloy products are fabricated from an improved alloy broadly containing 0.4 to 1.2% silicon, 0.5 to 1.3% magnesium, 0.6 to 1.1% copper and 0.1 to 1% manganese. The alloy is treated at very high temperatures, approaching the solidus or initial melting temperature, to provide the improved performance. Thereafter, the alloy is shaped as by rolling, extruding, forging and other known aluminum wrought product-producing operations.
In the solution heat treated, quenched and artificially aged temper products so produced exhibit very high strength in comparison with 6XXX aluminum alloys, together with very high toughness and impact and dent resistance along with substantial corrosion resistance properties. In addition, the artificial aging response of the improved products enables use of high temperature, low cost aging treatments without risk of overshooting or undershooting the required or desired properties.
Functional Specifications of Aging Furnace:
This equipment is mainly used for the final hardening treatment to finished products, which is applicable to various aluminum sections. It can be divided into single-door, double-door, skip manual and maneuvering types in terms of its structure, and fuel oil, fuel gas as well as electric heating types in terms of heating mode, it is mainly used to the aging procedures for aluminum sections at the maximum temperature of 260 . Moreover, it is also for applications of °Cdrying and sintering procedures at the same temperature.
There main function of Aging Furnace is heating the aluminium sections.
Heating elements are provided which use the electrical power to heat the material . The temperature control is done through controller and ON/OFF control.
Challenge :
8 °CThe temperature control range is to be 1
Solution :
8 - Axpert Opti Power – AC Power controller is supplied for the heaters of 200 kW , 415 V
rating for the retrofitting previous analog type heater controller.
8 The temperature feedback is through thermocouple and used as internal PID control
of power controller.
8 Set point of temperature is set through 4-20 mA signal and controller is put in auto mode.
8 The panel protections are IP54 type to handle the dusty environment.
Benefits :
8 Firing angle control of power ensured smooth voltage variation to resistive coils.
8 °CTemperature control well within the range of 1-2 .
8 Problems of power contactor are eliminated.
8 Zero cross over (integral cycle control) methods ensure the reduction in harmonics.
8 All energy parameters are available on HMI of power controller, hence no separate
e m ter required for voltage / current / power / power factor / run hour etc..
SIR SCR IN-LINE CONTROL
CUSTOMER’S VOICE
Gandhinagar
Atlanta
GandhinagarAhmedabad
Mumbai
Surat
MuzaffarnagarDelhi(Gurgaon)
Vadodara
Indore
Jamnagar
Udaipur
Kolkata
Nagpur
Pune
Hyderabad
Vapi Raipur
Bhopal
Jamshedpur
JaipurLucknow
Vizag
Bangalore
Chennai
Belgaum
PondicherryTrichy
AurangabadNasik
Chandigarh
Veraval
M. D. Kamath
Biren Sutariya
Regional Offices
Contact Person Phone No. (O) Mobile No. E-mail
022-28846083Vrajesh Yadav 0981990050109108051977
09879208779
Mumbai
Bangalore
Chennai
Delhi
T. S. Sridhar 09840618533 09940229955.
Umesh Bhatia 09589344318Indore / Raipur [email protected]
H.O. and Service Center
Contact Person Phone No. (O) Mobile No. E-mail
Shailesh Patel 09879208780H.O. Gandhinagar [email protected]
Rajesh Moradiya 09909973780Amtech Service CenterGandhinagar
G. Sateesh Kumar 09573900222Hyderabad [email protected]
Kaushik C. 09932820680Kolkata [email protected]
09879208779
09589344318
09573900222
09932820680
09108051977