9- Suggest that you are an electrical power engineer with the Iraqi National Grid (ING ), you need to protect a power transformer of 132 KV / 11 KV against overvoltage, if the electrical discharge breakdown field strength = 90 MV / m and the distance between the electrodes 1 Cm, and the BIL = 630 KV, the rate of rise of waveform of overvoltage = 900 KV/S. Find the allowable worst location of the Surge .Diverter a- The allowable worst location of the Surge Diverter at : 33.5 m. b-) All these answers are wrong. C- The allowable worst location of the Surge Diverter at: 28.33 m. d- The allowable worst location of the Surge Diverter at : 30 m. %3D %3D
9- Suggest that you are an electrical power engineer with the Iraqi National Grid (ING ), you need to protect a power transformer of 132 KV / 11 KV against overvoltage, if the electrical discharge breakdown field strength = 90 MV / m and the distance between the electrodes 1 Cm, and the BIL = 630 KV, the rate of rise of waveform of overvoltage = 900 KV/S. Find the allowable worst location of the Surge .Diverter a- The allowable worst location of the Surge Diverter at : 33.5 m. b-) All these answers are wrong. C- The allowable worst location of the Surge Diverter at: 28.33 m. d- The allowable worst location of the Surge Diverter at : 30 m. %3D %3D
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Author:Robert L. Boylestad
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![9- Suggest that you are an electrical power engineer with the Iraqi National Grid (ING ),
you need to protect a power transformer of 132 KV / 11 KV against overvoltage, if
the electrical discharge breakdown field strength = 90 Mv /m and the distance
between the electrodes 1 Cm , and the BIL = 630 KV, the rate of rise of waveform of
overvoltage = 900 KV/S. Find the allowable worst location of the Surge .Diverter
a- The allowable worst location of the Surge Diverter at : 33.5 m.
b-) All these answers are wrong.
C- The allowable worst location of the Surge Diverter at : 28.33 m.
d- The allowable worst location of the Surge Diverter at: 30 m. >
10- Suppose that there are two types of H.V.T.Ls operating at the same voltage and
carrying the same current, but one of them with a smooth shape while the other
with standard shape. ? Which of them, you will choose.
a- Choosing the standard one.
b- Choosing the one with hollow construction shape.
C- All these answers are wrong.
d- Choosing the smooth one.
11- From the general electrostatic theories , the field strength at: breakdown is given by
a Eb = V/do = 0.6 [Y/(Eo Er)] 0.05.
b- Eb V/do = 0.6 [Y/(€o/Er)] 0.5.
C- Eb = V/ do = 0.6 [ Y/(€o Er) 30.5.
Eb V/ do =a.6[Y/(60 Er)10.5.
12- The peak inverse voltage across any diode under no load condition in DC - HV Half -
Bridge : rectifier is
a- 1 Vo.
b- 0.8 Vo.
C2V0.
d- 1.8 V.
13- The main factor in studying High voltage engineering techniques is:
a- Voltage.
b- Current .
C- Electric Field.
d- Frequency.
14- Power loss due to corona is :
a- Inversely proportional to frequency.
b- Proportional to frequency.
Frequency does not effect. .
d- All these answers are wrong.
C-
15- As the ambient temperature increase the disruptive critical voltage of corona is:
a Decreased.
b- Increased.
C- No effect .
d- All these answers are wrong.
16- Using HV underground cable improve voltage profile and power factor in any loaded
inductive electrical grid because
a- due to its reactive power effect.
b- Due to resistive effect.
C- Due to its capacitive power effect.
d- All of the above answers are wrong.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd3c3d3e2-6a34-4e54-ab21-1e64347cc0d8%2F14490718-0eaa-4e81-9783-38219ab4477b%2F9yfynm8_processed.jpeg&w=3840&q=75)
Transcribed Image Text:9- Suggest that you are an electrical power engineer with the Iraqi National Grid (ING ),
you need to protect a power transformer of 132 KV / 11 KV against overvoltage, if
the electrical discharge breakdown field strength = 90 Mv /m and the distance
between the electrodes 1 Cm , and the BIL = 630 KV, the rate of rise of waveform of
overvoltage = 900 KV/S. Find the allowable worst location of the Surge .Diverter
a- The allowable worst location of the Surge Diverter at : 33.5 m.
b-) All these answers are wrong.
C- The allowable worst location of the Surge Diverter at : 28.33 m.
d- The allowable worst location of the Surge Diverter at: 30 m. >
10- Suppose that there are two types of H.V.T.Ls operating at the same voltage and
carrying the same current, but one of them with a smooth shape while the other
with standard shape. ? Which of them, you will choose.
a- Choosing the standard one.
b- Choosing the one with hollow construction shape.
C- All these answers are wrong.
d- Choosing the smooth one.
11- From the general electrostatic theories , the field strength at: breakdown is given by
a Eb = V/do = 0.6 [Y/(Eo Er)] 0.05.
b- Eb V/do = 0.6 [Y/(€o/Er)] 0.5.
C- Eb = V/ do = 0.6 [ Y/(€o Er) 30.5.
Eb V/ do =a.6[Y/(60 Er)10.5.
12- The peak inverse voltage across any diode under no load condition in DC - HV Half -
Bridge : rectifier is
a- 1 Vo.
b- 0.8 Vo.
C2V0.
d- 1.8 V.
13- The main factor in studying High voltage engineering techniques is:
a- Voltage.
b- Current .
C- Electric Field.
d- Frequency.
14- Power loss due to corona is :
a- Inversely proportional to frequency.
b- Proportional to frequency.
Frequency does not effect. .
d- All these answers are wrong.
C-
15- As the ambient temperature increase the disruptive critical voltage of corona is:
a Decreased.
b- Increased.
C- No effect .
d- All these answers are wrong.
16- Using HV underground cable improve voltage profile and power factor in any loaded
inductive electrical grid because
a- due to its reactive power effect.
b- Due to resistive effect.
C- Due to its capacitive power effect.
d- All of the above answers are wrong.
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