Ground conditions

Ground condition investigations Locating cracks in concrete... 

Grounding conditions Whether an isolated neutral system, an effectively grounded system or a non-effectively grounded neutral system ... 

Higher overvoltages than considered, during an actual fault, say, because of unfavourable grounding conditions. 

Ground fault Section 20.1. It is essential to know the grounding conditions to deterniine the OV factor as below ... 

This is an important indicator that shows the grounding condition of a system and helps to determine the most... 

When the system parameters Rq, Xq and are known, the value of GFF may be determined more accurately by the use of Figure 20.16, which has been established for different grounding conditions, i.c. for different values of Rq, X ) and X. ... 

A scheme for a ground fault protection will depend upon the type of system and its grounding conditions, i.e. whether the system is three-phase three-wire or three-phase four-wire. A three-wire system will require an artificial grounding while for a four-wire system the type of grounding must be known, i.e. whether it is effectively (solidly) grounded or non-effeclively (impedance) grounded. 

Triple harmonic quantities are unbalanced ( uantities and can exist only on a system, which has a grounded neutral. The configuration of the windings of the source generating the harmonics, the system to which it is connected, and its grounding conditions, thus play a significant role in transmitting the harmonics to the whole system as discussed below ... 

This recommendation is applicable for most conditions encountered in the use of this type mast. There will be exceptions where location clearance, ground conditions, or other unusual circumstances require special considerations. Figure 4-5 shows a recommended guying pattern that may be used under general conditions in the absence of an authorized API manufacturer s recommendations. Guy lines should be maintained in good condition, free from rust, corrosion, frays, and kinks. Old sand line is not recommended for guy lines. 

Foundations must consider ground conditions, location preparation, and supplemental footing as required to provide a stable base for mast erection and to support the mast during the most extreme loading encountered. A recommended location preparation to provide ground conditions for safe operations is shown in Figure 4-6. 

Dependent on ground conditions, loading requirements and settlement limits, industrial ground floors may be ground bearing, raft constmction or piled. The piled option should, if possible, be avoided, as the cost is comparatively very high. 

Civil engineering considerations such as ground conditions and drainage. 

The connection to earth can be made utilizing earth rods, earth plates, earth lattices or grids, or buried strip conductors. Selection depends on the locality and type of ground conditions at the site. The effectiveness of the earth connection is, in turn, dependent on the resistivity of the soil at the site, the type of soil and climatic conditions have a direct effect upon the resistance of the connection made. Typical values of resistivity — m) for different types of soil are ... 

The compressor plant should be located in a place with good ground conditions. In some cases, the compressor foundation may have to be isolated from that of the main building so that vibration is not transmitted from compressor to the building structure, and from heavy plant to the compressor. Where the vibrations are slight, resilient pads may be used to advantage. Receiver-mounted units should always be either freestanding or mounted on resilient pads. If in doubt, the suppliers should be consulted. 

Figure 5-4 Effect of ground conditions on vertical wind gradient. Adapted from D. Bruce Turner, Workbook of Atmospheric Dispersion Estimates, (Cincinnati US Department of Health, Education, and Welfare, 1970), p. 2.

In order to allow the resistance measurement, the current injection is obtained in the circuit represented in fig. 3, by applying a voltage Vo- This current, due to the virtual ground condition determined by the circuit configuration (very high input impedance), will cross the feedback resistor Rf and determine an output voltage. In this example M and Yj (j=l,2,3) are the quantities ... 

Intensive culture of bananas, as with many other crops, is beset with many problems. Even in isolated plantings, pests of one kind or another reduce the potential crop or even destroy it entirely. In the majority of cases pest control has been confined to large acreages in more intensified banana culture. Many factors have contributed to retarding the use of pest control, such as weather and ground conditions that prevent the use of portable equipment without expensive road systems, small plantations, lack of finances, indifference on the part of grower, and no local demand for quality fruit. 

Versatile remediates a variety of mixed wastes and operates under varying ground conditions and sediment types. 

To assess and quantify the impacts of past and future climatic variability and change on components of the cryosphere and their consequences, particularly for global energy and water budgets, frozen ground conditions, sea level change, and the maintenance of polar sea ice covers. 

The Wenner array should not be used unless the expected ground conditions are fairly simple. The Schlumberger array is less sensitive to lateral resistivity variations. 

Both dusters and granular applicators are speed sensitive, so maintain uniform speed. Do not travel too fast for ground conditions. Bouncing equipment will cause the application rate to vary. Stay out of any dust created by action of the equipment. 

At the meadow Station Johnston will read a velocity profile (British anemometers at 1, 2, and 3 meters 5 min. average) every ten minutes and will make a bivane record every ten minutes. Mills will read a temperature profile every ten minutes and make psychrometer observations every half hom (the first reading being before the shoot). Mills will keep a record of sky and ground conditions at ten minute intervals. 

The ground conditions Poor ground conditions may involve piling, undulating areas requiring excavation and/or filling, etc. 

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