Development of a monitoring unit for an a.c. generator

Τίτλος

Development of a monitoring unit for an a.c. generator

Θέμα

Electric generators--Alternating current

Oscillators--Electric

Δημιουργός

Giovanni, Antonis

Πηγή

Higher Technical Institute

Το πλήρες κείμενο είναι διαθέσιμο από το Υπουργείο Ενέργειας, Εμπορίου Βιομηχανίας και Τουρισμού.

Εκδότης

Library of Cyprus University of Technology

Ημερομηνία

1997

Συνεισφέρων

Hadjioannou, S.

Δικαιώματα

Απαγορεύεται η δημοσίευση ή αναπαραγωγή, ηλεκτρονική ή άλλη χωρίς τη γραπτή συγκατάθεση του δημιουργού και κάτοχου των πνευματικών δικαιωμάτων.

Μορφή

pdf

Γλώσσα

en

Τύπος

text

Αναγνωριστικό

EED0529

Σύνοψη

The objectives of this diploma project, as proposed by the Higher Technical Institute, was to design, construct and test an electronic monitoring unit for an ac generator.
This unit consist of a digital frequency meter, a voltmeter and a battery charger.
All the parts was mounted on a suitable and safe board.
The main part of this monitoring unit is the frequency meter which is based on a digital counter. This implies that the generator output is converted into TTL compatible pulses. The generator which the unit will monitor is 240V,50Hz. So the meter will be used to measures frequencies of about 50Hz only. The frequency meter was design and adjusted to measure frequencies up to 999 HZ.
The frequency meter uses a 555 timer I.e. as an oscillator, and we can change the range of the meter by changing the frequency of the oscillator. It also uses 7490 I.e. as a decade divider and the same I.e. is used as a decade counter. 7473 is used as a flip-flop and as a positive transition triggered monostable the 74121 is used. 7495 is used as memory and 7447 as a decoder.
All the units is supplied from a 12V battery source. This battery is recharged when the generator starts.
A voltmeter is also available on the board in order to monitor the output voltage of the generator.
The block diagram of the monitoring unit tor me a.c. generator is shown in fiq.1.