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Gemiola [76]
3 years ago
5

If, when a relay is energized, you measure 0.05 VAC across a set of normally open contacts, the A. relay is operating properly B

. contacts must be burnt C. contacts must be pitted D. coil is open
Engineering
1 answer:
LiRa [457]3 years ago
3 0

Answer: A

Explanation:

It means the relay is working properly.

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A 150 MVA, 24 kV, 123% three-phase synchronous generator supplies a large network. The network voltage is 27 kV. The phase angle
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Answer:

the generator induced voltage is 60.59 kV

Explanation:

Given:

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Vline = 24 kV = 24000 V

X_{s} =1.23(\frac{V_{line}^{2}  }{s} )=1.23\frac{24000^{2} }{1500} =4723.2 ohms

the network voltage phase is

V_{phase} =\frac{V_{nline} }{\sqrt{3} } =\frac{27}{\sqrt{3} } =15.58kV

the power transmitted is equal to:

|E|=\frac{P*X_{s} }{3*|V_{phase}|sinO } ;if-O=60\\|E|=\frac{300*4.723}{3*15.58*sin60} =34.98kV

the line induced voltage is

|E_{line} |=\sqrt{3} *|E|=\sqrt{3} *34.98=60.59kV

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