Negative Booster

Negative booster

A negative booster is employed to conform to the regulation that the potential difference between any two points of the rail return shall not exceed 7 V.

Two boosters, positive and negative, are used which are mechanically coupled together and driven by a DC motor. The positive booster is connected to the trolley wire (near the generating station) and the negative booster (separately excited) is connected to the track rail.

The 'positive booster' adds voltage to the line while the 'negative booster lowers the potential of the point it is connected to.

As we go along the trolley wire away from the generating station/sub-station, the potential drop increases, and the voltage of the trolley wire falls. Since the current returns via the track rail points away from the generating station acquire high potentials.

This potential is brought down by the negative boost provided by the negative booster. When the load is sufficiently far away from the generating station, the trolley wire is fed by the positive booster.

The current in the positive booster provides the excitation for the negative booster. The feeder current as it flows through the booster maintains the voltage of the trolley wire within 1imits.

The potential at the corresponding point on the tack is reduced by the negative booster since its voltage is regulated by the same feeder current. Thus the track is maintained nearly at earth potential.

The negative booster is separately excited. As we go along the trolley wire away from the sub-station, the potential drop increases and the voltage of the trolley wire falls.

Since the current returns via the track rail, the points away from the sub-station acquire higher potentials. This potential is brought down by the negative boost provided by the negative booster.

The trolley wire is fed by the positive booster PB when the load is sufficiently far away from the generating station. The current in the positive booster provides the excitation for the negative booster.

The voltage of the trolley wire is maintained within certain limits by the feeder current as it flows through the booster.

The potential at the corresponding point on the track is reduced by the negative booster since its voltage is regulated by the same feeder current. Thus, the track can be maintained at nearly earth potential.

RS Aggarwal Aptitude Book PDF Free Download

RS Aggarwal Aptitude Book PDF Free Download RS Agarwal Aptitude Book PDF Free Download: Quantitative Aptitude by R.S Aggarwal is a standout amongst the most inclining books among the hopefuls getting ready for Bank PO, PO, MBA, RBI, IBPS, CAT, SSC, IAS, PSC, Hotel Management, Railway Recruitment Exams, and other aggressive and placement tests. This book is suggested by different specialists in this field. This book covers relatively every theme which is being requested for the focused exams. On the off chance that you are looking to Download RS Aggarwal Quantitative Aptitude PDF's most recent version with the expectation of complimentary then you appear to be at the correct place. Download PDF RS Agarwal Aptitude Book PDF Free Download This book covers Problems on Surds and Indices, Simplification, Numbers and Ages, Pipes and Cisterns, Boats and Streams, Problems on Trains, Simple and Compound Interests, Time and Work, Permutations and Combination, Clocks, Odd Man Out, Heights

Limitations of Terzaghi Theory

Limitations of Terzaghi Theory The value of the coefficient of consolidation has been assumed to be constant. The distance d of the drainage path cannot be measured accurately in the field. The thickness of the deposit is generally variable, and an average value has to be estimated. There is sometimes difficulty 1n locating the drainage face, and sometimes thin previous seams that can act as good drainage faces are missed in the boring operations. The equation is based on the assumption that the consolidation is one-dimensional. In the field, the consolidation is generally 3-dimensional. The lateral drainage may have a significant effect on the time rate of consolidation. The initial consolidation and secondary consolidation have been neglected. Sometimes these form an important part of the total consolidation. In actual practice, the pressure distribution may be far from linear or uniform.

Types Of Current Collector

Current Collector A current collector is a device used to collect electrical current from a moving conductor, such as a train or a trolley. It is typically used in electric vehicles, such as trains and trams, to transfer power from an overhead power source to the vehicle's electric motor. The current collector consists of a sliding contact, which is often made of carbon or copper, that makes contact with an overhead power source, such as an overhead catenary wire or a third rail. The sliding contact is mounted on the vehicle and is typically in the form of a pantograph or a trolley pole. The pantograph is a device with a metal frame and a spring-loaded arm that presses against the overhead power source. It is raised and lowered by the operator of the vehicle, and as it moves along the overhead power source it maintains contact and collects the electrical current. The trolley pole is a vertical pole that is mounted on the roof of the vehicle and has a horizontal arm that extends out

Self Study World

Search This Blog