Scarica con impulso di tensione avente tensione di picco 725 kV, tempo alla scarica 19,8 µs

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Oscillogrammi dal registratore di transitori Dr Strauss Impulso su polo di sezionatore Um 145 kV, Up 650 kV Tenuta dell’isolamento

0 20.0µs 40.0µs 60.0µs 80.0µs 100µs 120µs

0 TB1=100.00MS/s TB1=100.00MS/s

0kV 70kV 210kV 351kV 491kV 631kV 701kV

CH1

No.: 33605 CH1 Eval.: LI Up= 701.0kV Up2= -0.27%

beta2= - T1= 0.96µs T2= 61.9µs

0 2.00µs 4.00µs 6.00µs 8.00µs

0 -2.00µs

TB1=100.00MS/s TB1=100.00MS/s

LI: - FW(100.0%)

0kV 70kV 210kV 351kV 491kV 631kV 701kV

CH1

No.: 33605 CH1 No. 33605 Eval.: LI Up= 701kV Up2= -0.27%

T1= 0.96µs T2= 61.9µs

(2)

Scarica con impulso di tensione avente tensione di picco 725 kV, tempo alla scarica 19,8 µs

0 20.0µs 40.0µs 60.0µs 80.0µs 100µs 120µs

0 TB1=100.00MS/s TB1=100.00MS/s

LI: - CFW(100.0%)

0kV 73kV 218kV 363kV 508kV 653kV 726kV

CH1

No.: 33615 CH1 No. 33615 Eval.: LI Up= 725.6kV Up2= -9.13%

T1= 0.98µs Tc= 19.8µs

0 2.00µs 4.00µs 6.00µs 8.00µs

0 -2.00µs

TB1=100.00MS/s TB1=100.00MS/s

0kV 73kV 218kV 363kV 508kV 653kV 726kV

CH1

T1= 0.98µs Tc= 19.8µs

(3)

Scarica con impulso di tensione avente tensione di picco 760 kV, tempo alla scarica 13,6 µs

0 20.0µs 40.0µs 60.0µs 80.0µs 100µs 120µs

0 TB1=100.00MS/s TB1=100.00MS/s

LI: - CFW(100.0%)

0kV 76kV 228kV 380kV 532kV 684kV 760kV

CH1

No.: 33604 CH1 No. 33604 Eval.: LI Up= 759.9kV Up2= -10.18%

T1= 0.97µs Tc= 13.6µs

0 2.00µs 4.00µs 6.00µs 8.00µs

0 -2.00µs

TB1=100.00MS/s TB1=100.00MS/s

0kV 76kV 228kV 380kV 532kV 684kV 760kV

CH1

T1= 0.97µs Tc= 13.6µs

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LIGHTNING IMPULSE VOLTAGE WITHSTAND TEST

CIRCUIT DIAGRAM

G : Impulse generator PASSONI & VILLA - Type C 5841 – 12 stages – 0.21 mF - 200 kV O : Object under test

D : Capacitive damped Voltage Divider – Passoni & Villa – S.N. 12776 – Low voltage arm S.N. 12776/B

R : Digital recorder - STRAUSS TRAS 10-100 - S.N. 462 C

1

= 17.5 nF

C

2

= 1.5 nF R

1

= 300 W R

2

= 4200 W R

3

= == W

Ambient conditions

Temperature : 18.5 °C

Atmospheric pressure : 101.6 kPa Relative humidity : 36.7 % Absolute humidity : 5.8 g/m

³

Correction Factors K

+,

K

-

: 0.955, 1.008

Standard reference atmosphere

Temperature : 20.0 °C (293 K)

Atmospheric pressure : 101.3 kPa

Absolute humidity : 11.0 g/m

³

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IMPULSE VOLTAGE WITHSTAND TEST RESULTS TABLE

Config.

N. Arrangement of the object under test

Applied Voltage (kV

p

) (2)

N. Impulses

Remarks

1 Disconnector closed

A,a energized

F earthed

+ 650 - 650

15 15 Withstand

2 Disconnector open

A energized

a, F earthed

+ 650 - 650

15 15

3 Disconnector open

a energized

A, F earthed

+ 650 - 650

15 15

4 Disconnector open

A energized

a earthed F floating

+ 750 - 750

15 15

5 Disconnector open

a energized

A earthed F floating

+ 750 - 750

15

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