sag mill in thyristor

GEARLESS MILL DRIVES IN MINING INDUSTRY.pdf | Mill ...

The groups are A GMD with a high power of up to 20 MW and more, as a connected in series to form the feed phases of the result of today's requirements for ball and SAG mills for the motor. The bridges consist of 6 power thyristors with a minerals industry, has of course a certain complexity.

SAG Mill - Official Feed The Beast Wiki

Sep 26, 2020· The SAG Mill is a machine added by Ender IO.It uses Micro Infinity (µI) to grind (or mill) items into their crushed variants, like Ores into Dusts.The SAG Mill has four output slots; recipes can have 1-4 different outputs, with different chances of obtaining those outputs. Uniquely, the SAG Mill can use Grinding Balls made from various materials to increase energy efficiency (resulting in ...

SAG mills (semi-autogenous grinding mills) - Metso

SAG milling extends itself to many applications due to the range of mill sizes available. They can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill and some or all of the work done by a ball mill. SAG mills are also an optimum solution for wet grinding since crushing and screening in these ...

The behavior of the cycloconverter fed gearless drive ...

motors (2 x 6.8 MW) for the two ball mills and a 12 MW gearless drive for the SAG mill with its filter circuits. A 14 MVA load and its compensation of 2 x 2 Mvar can represent the low-voltage loads. In this plant, short-circuit currents appeared in the gearless drive when the electrical power company disconnected the external supply.

Sag Mill Syncronis Motor high axial vibration non drive ...

The thyristors are usually only active during start, when they short out the diodes to provide a path for the starting current. Anyhow, I stand by my recommendation from 3 Nov 14 06:37: Inspect and measure everything in exciter and rotor. Including low-ohm check of windings. ... When the Sag Mill was in operation the clutch operation just did ...

Siemens modernises drive system for ore mills - Mining ...

The modernisation project includes two 8MW semi-autogenous grinding (SAG) mills and two 1.7MW ball mills with dual pinion drives. The new drive systems are replacing the existing synchronous motors and direct converters for the SAG mills and the drive systems of the ball mills, which were installed by a different manufacturer.

TMdrive -10SPR Product Application Guide

The oil-fi lled rheostats posed a fi re hazard, and parts and service for the old thyristor controls were hard to obtain. The ... This variable speed drive application is a dual-pinion SAG mill driven by two 5,000 kW wound rotor induction motors. Two TMdrive-10SPRs control motor speed by recovering rotor current

FACTS brings power stability to mining equipment

AG and SAG mills can be used as a one-stage grinder but are often used as the first stage in a two- or multiple-stage grinding process, where the second stage is carried out by the ball mill. ... An SVC consists of a combination of thyristor-switched capacitors (TSCs) and thyristor-switched reactors (TSRs) or thyristor-controlled reactors (TCRs ...

Difference Between Sag Mill vs Ball Mill - mech4study

Oct 12, 2017· SAG mill make use of steel balls included with some large and hard rocks for grinding. These mills utilize the balls in making the large fragments of materials broken into pieces. The ball charge of a SAG mill is about 9% to 20%.This process takes place inside the large rotating drum of SAG mill which is filled with balls partially.

How the Modern SER Drive boosts grinding performance - CSE ...

The CSE Uniserve Modern SER Drive is a compact, powerful, multi-functional and reliable addition to other SAG mill control technologies on the market today. Electrical features The CSE Uniserve Modern SER is designed, manufactured and tested to the ISO 61800 family of standards, meaning you can be sure it will operate in almost any site or ...

SAG Mill Control: It Shouldnt be that Hard

SAG mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill and/or manipulating the rotational speed of the mill. The best way to measure load is to mount the mill on load cells. ... the system will release the thyristor pulses and will power the mill slowly up to the previous speed when ...

mill motor wrap around

sag mill wrap around motor schilderinuwregio. ball mill wrap around motor ssgpowercoin. Grinding Mills Grinding mills supplied by have their origins renowned SAG and Ball Mills operating in some of Wrap around motors for increased power draw on. the large wrap around motor foe ball mill, twin drive sag mill bluegrassmdus (776 m) long, 26,016 HP (19,400 kw) Siemens wrap around

MOTOR TECHNOLOGY Saving energy - TMEIC

Mill drive example An example of slip power recovery is the wound rotor motor shown below, one of two for powering a new 10,000 kW SAG mill in Australia as shown in Figure 3. This installation includes: • Two 5000kW six-pole WRIMs with 11,000v stators • A combining gear box driving the mill • One 10,000kW liquid resistance starter (rheostat)

Grinding Mill - an overview | ScienceDirect Topics

SAG mills, particularly in American practice, have a large diameter-to-length ratio. Tumbling mills are 35–50% filled with grinding medium, since this gives optimum power draft. The selection of the (average) medium size is a compromise between being large enough to break the largest particles, and small enough to maximize the number of ...

Siemens modernizes drive system for ore mills in Chile ...

The modernization project includes two 8 MW SAG (semi-autogenous) mills and two 9.7 MW ball mills with dual pinion drives. The new drive systems are replacing the existing synchronous motors and direct converters for the SAG mills and the drive systems of the ball mills, which were installed by …

Mill drive selection for semiautogenous grinding mills

Early SAG mill designs using gear drives were limited in the amount of power that could be applied to the pin-ions, 3.7 MPa (5000 hp). The exception to this design was the Hibbing taconite operation. It used two4.47 MPa (6000 hp) motors to drive a 1I-m-diam x 4.5-m long (36-ft-diam x 15 ft) autogenous mill. However, recent SAG mill designs now ...

Harmonics related problems in practical design of isolated ...

In 2005 harmonic measurements and switching transients were carried out on a gold processing plant comprising two SAG mills. The results of the measurements are presented and linked to the power system analysis technique.

(PDF) Technical Evaluation and Practical Experience of ...

Voltage waveform at the rectifier input side of an 18 000-hp LCI SAG mill drive. (a) Line-to-line bus voltage waveform (11 270-V peak). (b) Average rms value of the associated frequency spectrum ...

D'Angelo International - Mining Technology | Mining News ...

Grinding: ball, rod, SAG and attrition mills and accessories. D'Angelo International is experienced with removal and shipping and provides grinding mills worldwide. We deliver mills on time, within budget and without delivery delays. D'Angelo provides liner systems, liner handlers, drives and mill …

Designed Images | Controlling power system parameters ...

It consists of thyristor controlled reactors (TCR) in parallel with thyristor switched capacitors (TSC). The reactive equipments of the compensator are connected to the transmission line, through a transformer to prevent the equipments having to withstand full system voltage. ... While large crushers, shredders, conveyors and SAG & BALL mills ...

wound rotor motor mill drives

Figure 4: typical SAG mill motor drive equipment. Since such drives Figure 3: one of two wound rotor motors for a 10,000kW SAG mill ICR SEPTEMBER 2009. are in volume production at this time, support should be available for years to come. Getting renewal parts for older thyristor …

Revolutionary Drive Controller for Gearless Mills

Ball and SAG mills are one of the most expensive pieces of equipment designed without redundancy, thus they can quickly ... usually half-suppressed thyristor converters used for years with DC drives. The basic unit is generally a three-phase bridge with which a ... As the loaded mill starts up, the control system evaluates

SIMINE Gearless mill drives

Whether you're talking about SAG or a ball mill, space is a delicate issue, especially in the concentrator. That's ... mill-motor interface is a multifaceted task, a procedure ... Its thyristors are designed to disconnect the short circuit.

Medium Voltage VSDs in mill drive applications

Two mills typically used are Ball Mills and SAG Mills which form part of the early stages of the recovery of various metals such as gold, platinum, uranium, copper and other ... control of Thyristor devices (Integrated Gate Commutated Thyristors (IGCTs) and Symmetrical Gate Commutated Thyristors …

Integrated drive technology from Siemens enhances ...

In future, two gearless mill drives and Sinamics cycloconverters will be used in the new production line with one SAG mill and one ball mill. Thus, one million tons of copper concentrate, 10 000 tons of molybdenum and four million ounces of silver oxide can be mined annually – even at an altitude of around 4600 m above mean sea level.

Grinding Sag Simulasi - BookZone

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New Product Offering | actiVAR TM - Thyristor Switched ...

Apr 01, 2014· New Product Offering | actiVAR TM - Thyristor Switched Harmonic Filter Banks. Share this article: Tuesday Apr. 1, 2014 Northeast Power Systems, Inc. (NEPSI) is excited to announce actiVAR ™, its newest medium-voltage product offering, which mitigates voltage sags, voltage flicker, and high inrush currents associated with starting and impact loading of large motors and dynamic loads.

Commissioning Variable Speed SAG Mill Gearless Drive

Table of ContentsGeneral Description of the DriveAssembling and ConstructionComponent CharacteristicsDrive Evaluation The electric operation and design features of the 11,000 H.P. variable speed SAG mill gearless drive is presented. The function of the frequency-converter, control system drive and lubrication systems are described. An analysis of the harmonic characteristic in the Supply ...

Gearless Mill Drive Protection Improvements and Its ...

Laguna Seca concentrator uses a SAG mill and three ball mills, all driven by gearless mill drive (GMD) systems. Table 1 gives ... thyristor supervision cards in the power part provide an optical . signal to the XV C513 receiver cards and through the XV C512 control card, they provide a …

The Seven Types of Power Problems - Schneider Electric

Sag / undervoltage 9 Swell / overvoltage 10 Waveform distortion 11 Voltage fluctuations 15 Frequency variations 15 Conclusion18 Resources19 Appendix20 Click on a section to jump to it Contents White Paper 18 Many of the mysteries of equipment failure, downtime, software and data corruption, are the result of a prob-lematic supply of power.

SAG Mill - Feed The Beast Wiki

The SAG Mill is a block added by the EnderIO mod. A machine similar to a Pulverizer or a Macerator.It is used to process resources to produce dust. It accepts energy in the form of Redstone Flux or Minecraft Joule, with an internal buffer of 100,000 RF and consumption of 20 RF per tick.The energy storage capacity and processing speed can be increased by adding one of 3 tier of Capacitor into ...

aplikasi cycloconverter rolling mill dries

Cycloconverter For Sag Mill 38 Feet. Cycloconverter for sag mill 38 feetkoroda.Fqm has opted for siemens gearless mill drives to be used in the two sag mills having a diameter of 40 feet and an output of 28 mw and the two ball mills with a diameter of 28 feet and an output of 22 mw.With these mill drive systems there is no wear in the drive train since all forces are.

Siemens Modernizes Drive Systems for Chilean Mills | E & MJ

Siemens has been commissioned to modernize the drive systems for four mills at the Collahuasi copper mine in northern Chile. The company will supply complete state-of-the-art drive systems comprising new motors and Flender couplings with torque limiting shear pin as well as new Sinamics SL150 cycloconverters with thyristor stacks.

Types of Steel Rolling Mills | Reversing Hot | Continuous Hot

The sag of the metal between two stands must be avoided. This sag may occur when there is a slight difference in the operating speed. The speed drop may occur due to sudden application of load, which normally happens when the metal comes into contact with the rolls. A closed loop control must assure quick restoration of the speed of the motor.