３． A Steep Wave suppression Device

Maaki Kando

(Prof.E.Dr.)

Tokai University

Background ・ Object

【 High Information Society 】　　 ▽ Electronics

　▽ Networks

【 Damage from lightning 】 ▽How to protect apparatuses and devices

from over-voltage and/or surge

【 High Voltage Large Currents with air gap 】 ▽Small Size & Practical Use

View of electrode Systems

Developed SPD

図１

図２

Triggering

Main E

Input

Load

(CPG)

CPG: Cylindrical Pulse Generator

CPG

Triggering

Main E

INOUT

Fig.1

Fig.2

Experimental Configurations

図３　

d1

d2

円筒空芯パルス発生器 1200[pF]

6[kΩ ]

‐デｨジタルオシロスコ プCh1 Ch2

高圧プローブ

入力

500MHz 5Gs/s

Cylindrical pulse generator (CPG)

IN Put

HVProbe

Digital OS

Fig.3

Waveforms of Electrode System

Waveforms of a SPD

Ch1

Ch2

Ch1

Ch2

図４

図５

Examples of the waveforms of SPD

図６

図７ 図８

図９

図１０

図１１

UP side ： Main Electrode

　　　 Breakdown Voltage

Down side ：

Triggering Electrode

　　　 Breakdown Voltage

図１２

1kV/div

0.4μs/div

UP ： Main Electrode

Breakdown Voltage

Down ： Triggering Electrode

Breakdown Voltage

１

図１３

0.5kV/div

4μs/div

図１４

00.5

11.5

22.5

33.5

44.5

5

0 1 2 3 4 5 6

[kV]電極間印加電圧

[kV

]電

極間

絶縁

破壊

電圧

0

10

20

30

40

50

60

[]

抑制

率％

トリガー電極絶縁破壊電圧

主電極絶縁破壊電圧

絶縁破壊率

電極間印加電圧 対 絶縁破壊電圧・抑制率

Applied Voltage

Relationship between Breakdown Voltage and applied Voltage

Suppression rate[%]

Trigger

Main

[%]

Relationships between time lag and applied voltage

Fig ．１５

印加電圧対絶縁破壊時間遅れ

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

0 1 2 3 4 5 6

[ ]印加電圧 ｋＶ

[μ]

時間

遅れ

ｓ

Applied Voltage [kV]

Time Lag

Steep wave Suppression of AC power superimposed

an impulse wave

Imput waveform

After suppression

waveform

1 〔ｋＶ〕 /div 10 〔 ms 〕 /ｄｉｖ

入力電圧　3.86 〔 kV 〕

出力電圧　1.98 〔 kV 〕

Input With SPD

After Suppression

50 ％ !!1 〔ｋＶ〕 /div 2 〔 ms 〕 /ｄｉｖ

入力電圧　3.86 〔 kV 〕

出力電圧　1.98 〔 kV 〕

Suppression rate 50%

Water Proof抑制装置 抵抗 コンデンサ

図２１

図２２

図２３

図２４

Unit Resistance

Capacitor

CPG

異常電圧を抑制

雷サージ電圧が重畳 Explanation of Operation Ac+Lightning Surge

Suppressionof Surge

Conclusions

Surge ( impulse) was suppressed.Operation time was approx. 0.1-

1.6[μs]Small size of Surge Protection

Device was made ,which was based on experimental electrode systems.

Thank you very much