Design and Analysis of Power Supply Networks

The increase in the capacity of cleaning and construction vehicles for highcapacity and energy-intensive mines calls for an increase in the supply voltage of cleaning and tunneling combines, as well as transport systems: from a voltage of 660 V switched to 1140 V, and now to 3300 V. This allows improving technical and economic indicators for clearing and access areas, as well as improving the reliability of local Power Supply Systems (PSS). However, this trend prevents the supply of underground electric networks with a voltage of 6 kV, in connection with which the problem arises of increasing the voltage of supply networks. To date, it has become possible to apply the 10 kV voltage to the operation, which is most acceptable for the use of electrical equipment for electrical networks and protection devices. Leading educational, research and design organizations were engaged in research on this issue. An analysis of the results of the research showed that switching to 10 kV voltage is justified and timely. At the same time, 35 kV voltage is not removed from the agenda, which is technically feasible and economically justified, but there are problems with the safety of its operation in underground workings, which requires appropriate refinement. This level of voltage will improve the quality of electricity.Conclusions: 1. Application of 35 kV voltage in the underground power supply system of coal and ore mines is advisable at a depth of more than 1000 m with a maximum load of at least 1000 kVA at the level of the stem cables.2. Application of 35 kV voltage in underground electrical networks will allow to significantly improve the quality indicators of voltage, reliability, and economy of the system due to the current unloading of the most important element of SES, such as stem cables.3. Analysis of the main parameters and characteristics of electrical mine electrical equipment gives reason to believe that it allows implementing a trend of 35 kV deep input to deep horizons of mines (mines) and placement of 35/6 kV substations on working horizons.

Download Full-text

Robust Logistics

2030 ◽

10.1093/oso/9780195377170.003.0024 ◽

2010 ◽

Author(s):

Rutger van Santen ◽

Djan Khoe ◽

Bram Vermeer

Keyword(s):

Supply Chain ◽

Power Supply ◽

The Other ◽

Central Issue ◽

The Internet ◽

Supply Network ◽

Supply Networks ◽

Trade Off ◽

Industrial Companies ◽

The Web

Our lives seem to revolve around schedules. If we don’t honor them with second-to-second precision, we miss our trains and our workplace rosters fall apart. We’re reliant on one another, and we constantly have to coordinate our schedules with those of others. Planning is crucial to our industry, too. If you unexpectedly run out of nuts and bolts, you can’t make any more cars, and the entire production process grinds to a halt. No manufacturer can afford that, so industrial companies employ large teams of specialists whose job is to ensure there are never any shortages of key parts. A worldwide logistic network has become our industry’s lifeblood. The central issue facing logistics is that of reliability. How do you keep your supply network intact? And how do you limit the consequences if it fails? These are questions that go far beyond the supply of nuts and bolts for new cars. Reliable logistics touches equally on the web of interactions that determine food production and the optimization of the Internet. It also extends to power supply, telecommunications, and workforce. Reliable networks make our society tick. But they face uncertainties of various kinds. That lends a broader significance to insights gained from industrial logistics, which offer us tools we can use to optimize networks and account for uncertainties in other areas as well. The reliability of a supply network is intimately bound up with the inventories you need to maintain. Businesses hold millions of dollars’ worth of supplies in their warehouses to make absolutely certain they never cease production due to a failure in the supply chain. So the key question is how large a stock do you need to hold of each component? Smart planning to hold down inventory levels in your warehouse generates immediate savings. On the other hand, you need enough stock to ensure continuity should anything go wrong. Optimizing storage is a common problem in supply networks. There is always a trade-off between the reliability of the network and the need for it to be profitable in an economic sense.

Download Full-text