By using spherical electrodes with the diameter D=50cm, the following breakdown voltages are measured at 18°C air temperature and 770mmHg pressure. a) If gap is equal to 7.4cm, calculate the breakdown voltage at normal conditions (20°C, 760mmHg). b) Calculate the real breakdown voltage for 1% relative measurement error (T=18°C, P=770mmHg).    c) Calculate the capacitance of the electrode system with the diameter D=50cm and the gap a=7.4cm. What is the value of the resistance (R) which leads minimum 1% relative error (H) during the measurement of breakdown voltage?   Çapı D=50cm olan küresel elektrotlar kullanarak 18°C sıcaklıkta ve 770mmHg hava basıncında tabloda verilen delinme gerilimleri ölçülmüştür. a) Elektrot açıklığı 7.4cm ise normal şartlar altında (20°C, 760mmHg) delinme gerilimini hesaplayınız. b) Gerçek delinme gerilimini %1 bağıl hata için hesaplayınız (T=18°C, P=770mmHg). c) D=50cm çap ve a=7.4cm elektrot açıklığına sahip elektrot sistemi için kapasite değerini hesaplayınız. Delinme gerilimi ölçümü sırasında en düşük %1 bağıl hataya (H) neden olan direnç değeri nedir (R) nedir?

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By using spherical electrodes with the diameter D=50cm, the following breakdown voltages are measured at 18°C air temperature and 770mmHg pressure.

a) If gap is equal to 7.4cm, calculate the breakdown voltage at normal conditions (20°C, 760mmHg).

b) Calculate the real breakdown voltage for 1% relative measurement error (T=18°C, P=770mmHg).   

c) Calculate the capacitance of the electrode system with the diameter D=50cm and the gap a=7.4cm. What is the value of the resistance (R) which leads minimum 1% relative error (H) during the measurement of breakdown voltage?

 

Çapı D=50cm olan küresel elektrotlar kullanarak 18°C sıcaklıkta ve 770mmHg hava basıncında tabloda verilen delinme gerilimleri ölçülmüştür.

a) Elektrot açıklığı 7.4cm ise normal şartlar altında (20°C, 760mmHg) delinme gerilimini hesaplayınız.

b) Gerçek delinme gerilimini %1 bağıl hata için hesaplayınız (T=18°C, P=770mmHg).

c) D=50cm çap ve a=7.4cm elektrot açıklığına sahip elektrot sistemi için kapasite değerini hesaplayınız. Delinme gerilimi ölçümü sırasında en düşük %1 bağıl hataya (H) neden olan direnç değeri nedir (R) nedir?

 

H(2-H)
(f=50HZ, &=1, ɛ0=8.85pf/m, C=2rre(1+r/a), R =
%3D
wC(1-H)
R
Uc
U
a
a (cm) 6,5 7
U (kV) 180 | 190 | 214
8
Transcribed Image Text:H(2-H) (f=50HZ, &=1, ɛ0=8.85pf/m, C=2rre(1+r/a), R = %3D wC(1-H) R Uc U a a (cm) 6,5 7 U (kV) 180 | 190 | 214 8
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