Application of transistor techniques to relays and protection for power systems

Hamilton, F.L.; Legg, M.; Patrickson, J.B.

doi:10.1049/piee.1967.0042

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…We press the push button type LUN 3211 determined for starting on ground. Therefore, contacts (1,2), (3,4) will be closed.Hence, positive voltage (+) appears at contacts (3,4),(5,6) and also at terminals 1 and 2 of socket A. Then, voltage stabilizer (feeding all schmitt circuits and ECL by stabilized voltage 12V),will be supplied by input 28V.…”

Section: Engine Vtbs On Groundmentioning

confidence: 99%

“…In order to start the engine during flight we proceed as follows. Push button LUN 3211 determined for starting during flight is pressed, where contacts (1,2), (3,4), and (5,6) are closed. Then terminals 1 and 2 of socket is connected to voltage 28V.…”

Section: Engine Vtbs During Flightmentioning

confidence: 99%

“…Stabilizer is now energized to give 12V output . Due to the fact that engine speed is lass than n2 and its temperature is less than tl, output of ECL will be OV, hence winding Xr is energized keeping the closing of contacts (1,2), (3,4), and (5,6). Ignition coils will be off as the winding Xr is de-energized.…”

Section: Engine Vtbs During Flightmentioning

confidence: 99%

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Jet Engine Starting With Variable Time Base

Nasser

1985

International Conference on Aerospace Sciences and Aviation Tec

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Nowadays, jet engine starting systems on majority of aircrafts are working with constant time base, the fact that ignores the conditions of the started engine and feeding sources. We mean by constant time base starting of engine'that,a certain time mechanism, which operates independently, controls the process of starting cycle intervals. It means that at certain prescribed intervals of times, this mechanism pushes the starter motor to operate, then raises its speed, then lets aggregates (fuel pumps, ignition system,...) to take part in the process, ... and so on. Starting by this way is unsuitable from points of view of engine efficiency, reliability, and even the longer starting time. The using of solid state starting devices, allows to make a variable time base according to real parameters of started jet engine, and so to optimise the whole starting process. Main parameters of engine are its speed and temperature of gases in front of turbine plades (T3*). This work deals ' convential starting panels with constant time base, their advantages and disadvantages, and gives a praliminary solid state circuit that fulfills the variable time base starting process of an aircraft jet engine. The later configuration is very convenient from points of view of efficiency, reliability, weight and size, radio interference, and starting period. Besides, such concept may be found suitable with respect to starter motor efficiency. The designed circuit was applied practically to starter motor CT-2-48B in laboratory, and proved its applicability for such use. This circuit was designed to be suitable for use on ground and also during flight.

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Section: Engine Vtbs On Groundmentioning

confidence: 99%

Section: Engine Vtbs During Flightmentioning

confidence: 99%

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Jet Engine Starting With Variable Time Base

Nasser

1985

International Conference on Aerospace Sciences and Aviation Tec

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New approach to distance relays with quadrilateral polar characteristic for e.h.v.-line protection

Kumar

1970

Proc. Inst. Electr. Eng. UK

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Graphical methods, design considerations, practical circuits and test results of multi-input sine comparators†

Kumar

Parthasarathy

1968

International Journal of Electronics

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This pupor presents the graphical analysis and design considerations of multi-input sino comparators whoso mathematical nnnlysis has already been presented in an earlier paper by tho authors (Anil Kumar and Parthasarathy 1967). Particular emphasis is placed on the design of a circuit, using semiconductor components, which provides a quadrilateral polar oharactceist.ic on the impedance plane. Novelties of design include a reactance reach, increased tolerance to fault resistance as tho fault point moves towards the rolny location, directional feature and independent control of each line segment oonstituting tho quadrilateral, so that the fault area and tho relay characteristic could be closely matched. Test results show the negligible transient overreach and a constant operating time which is It cycles or less, and irrespective of fault location. Tho flexibility of design enables it to be used as a threezone stepped time-distance relay or in conjunction with pilot schemes. List ofprincipal symbols VI, L 0 = System fault voltage, referred to voltage transformer secondaries.ILL -

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Application of transistor techniques to relays and protection for power systems

Cited by 5 publications

References 3 publications

Jet Engine Starting With Variable Time Base

Jet Engine Starting With Variable Time Base

New approach to distance relays with quadrilateral polar characteristic for e.h.v.-line protection

Graphical methods, design considerations, practical circuits and test results of multi-input sine comparators†

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