high power Electrical Mining Machines

Abstract

This paper introduces a new use of a proven technologies to provide dynamic,voltage regulation in underground mine electrical distribution systems.This technology acts to"stiffen"the electrical energy feeding continuous miners and gegold leaching reactor manufacturersnerally raise and increase the voltage regulation in the continuous mining machines which may possibly be located over extended cable distances from the mine incoming electrical substation.

This is extremely useful for big underground continuous mining operations designed to use high power electrical mining machines fed more than extremely lengthy cable lengths(measured in 10s of km,from mine shaft to mine operating face).This new technologies offers rapidly acting dynamic voltage regulation(voltage help)although beginning continuous borers and extensible conveyor belts.Furthermore,when the mine is affected with less distribution voltage because of lengthy cable lengths,this new technology will raise the overall voltage at the mining machine,which may elevated mining machine production and cause longer motor life.

The technologies is depending on voltage source converters operating as static VAR compensators specially packaged for your harsh underground mine environment.Even though static VAR compensator technologies continues to be effectively used in utility and huge industrial applications for a lot of years(like open pit mining and arc furnaces),it has not(until now)been utilized for underground mining.

The paper will present the issue of poor voltage regulation in underground mines on weak electrical utility networks.It'll then talk about several of the alternatives which have been used to resolve this voltage problem.It'll then introduce the new technology used to resolve the issue and critique the troubles associated with making use of this technologies within the harsh underground atmosphere.Finally,the paper will show preliminary efficiency outcomes from a genuine installation inside a huge underground continuous mining operation in Canada.

Higher Production Capacity

The torque developed by mining machine motors varies with all the square of the applied voltage.If the voltage fed towards the mining machine motor is decreased by 5%,the torque developed in the motor shaft is lowered 10%.If the voltage fed towards the mining machine motor is lowered by 12%,the torque at the motor shaft is lowered 23%.Because orebodies mined by electrical mining machines have a particular comparatively constant power dependence on each and every ton of ore extracted,the decrease in shaft torque has a direct effect on mining machine production.A four rotor continuous mining machine with 4 500HP head motors experiencing a 12%reduction in voltage will simply have 1540HP available in the motor shafts.If the voltage regulation program is installed with a point close for the load, the voltage fed towards the mining machine may be regulated to 100%nominal voltage,thereby rising the shaft torque to style ratings.This enables complete production from your mining machines.

Application of Underground voltage regulation systems

An engineering study should be practiced prior to the application of a voltage regulation method.An engineering study would include a load flow study, harmonic study,and a quantity of method simulations and system response research to help within the correct style and use of a voltage regulation program.These studies are necessary to ensure a solid engineering style in the voltage regulation program but as well to establish the consequences the voltage regulation system may have around the mine electrical method during standard and abnormal circumstances.

Once the electrical capacity too as control method style of the voltage regulation program may be determined,it is then necessary to style the overall method taking into account the mine operating environment,operating practices too as maintenance practices.

A current improvement within the mining sector may be really helpful for mine operators who operate high power electrical mining equipment in their mine production process.This development is the Voltage Regulation Method developed particularly for that durable mine atmosphere to supply high-speed,dynamic voltage regulation for the mine electrical distribution systems.This paper discusses this new technologies and offers some background concerning voltage drops experienced more than long mine feeder cables.