Pojęcia podstawowe w układach trójfazowych v2, Elektrotechnika


POLITECHNIKA LUBELSKA

w LUBLINIE

LABORATORIUM ELRKTROTECHNIKI

Nazwisko :

Trepiak

Styła

Szych

Wójcik

Imię :

Łukasz

Sebastian

Piotr

Marta

Semestr

II

Grupa

E.D 2.3

Rok akadem.

00/01

Temat ćwiczenia:

Pojęcia podstawowe w układach trójfazowych

Data wykonania

2001.04.26

Ocena

  1. Cel ćwiczenia:

Celem ćwiczenia jest zapoznanie się z charakterem i podstawowymi właściwościami układów trójfazowych.

  1. Przyrządy pomiarowe:

3. Łączenie źródeł napięć trójfazowych.

R S T 0

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A X B Y C Z

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a x b y c z

Transformator trójfazowy

a) Układy połączeń uzwojeń transformatora:

a) b) c) d) e)

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A B C A B C A B C A B C A B C

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X Y Z X Y Z X Y Z X Y Z X Y Z

x y z x y z x y z x y z x y z

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a b c a b c a b c a b c a b c

b) Tabela pomiarów:

ZACISKI

NAPIĘCIE [ V ]

a)

b)

c)

d)

e)

x - y

x - z

y - z

a - x

a - y

a - z

b - x

b - y

b - z

c - x

c - y

c - z

a - b

a - c

b - c

4. Wskaźnik kolejności faz z tarczą wirującą.

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a) b)

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A C B A C B

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R R

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S S

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T T

UWAGA: Poprawne oznaczenie kolejności faz ma miejsce wówczas gdy tarcza

wskaźnika obraca się zgodnie z kierunkiem strzałki znajdującej się na

wskaźniku ( rys. a ) .

5. Układy R,R,L i R,R,C jako wskaźniki kolejności faz .

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a) A B C b) A B C

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R1 światł. R1 światł.

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słabe jaskr.

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L R2 C R2

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światł. światł.

jaskrawe słabe

a) Tabela pomiarów:

UA

UB

UC

UAB

UBC

UCA

IA

IB

IC

UKŁAD

V

V

V

V

V

V

A

A

A

a)

b)

b) Opracowanie wyników pomiarów:

W układzie gwiazdowym trójprzewodowym z obciążeniem niesymetrycznym :

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IA + IB + IC = 0

Napięcie między punktami neutralnymi odbiornika i generatora:

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Admitancje:

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dla układu: a) b)

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Przesunięcie fazowe między prądem i napięciem:

dla układu: a) b)

Obliczenia:

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,

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W obliczeniach fazę napięcia EA wynosi 0.

6. Metoda watomierza.

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T

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R W

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Schemat układu pomiarowego

Prawidłowemu oznaczeniu kolejności faz towarzyszy: wychylenie watomierza

w prawo przy włączeniu cewki napięciowej miernika na napięcie UR ,

wychylenie wskazówki w prawo przy włączeniu cewki napięciowej na US ,

wychylenie watomierza w lewo przy włączeniu cewki napięciowej na

napięcie UT.

Podczas pomiarów obwód musi spełniać warunek:



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