JPS6475970A - Detecting device of current - Google Patents
Detecting device of currentInfo
- Publication number
- JPS6475970A JPS6475970A JP23346787A JP23346787A JPS6475970A JP S6475970 A JPS6475970 A JP S6475970A JP 23346787 A JP23346787 A JP 23346787A JP 23346787 A JP23346787 A JP 23346787A JP S6475970 A JPS6475970 A JP S6475970A
- Authority
- JP
- Japan
- Prior art keywords
- current
- voltage
- resistor
- generated
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
PURPOSE:To prevent the occurrence of false detection due to a lightning surge current, by providing a discriminating means to discriminate the amplitude of a voltage which is reverse in polarity to a voltage in the direction of charg ing a capacitor and is generated at both ends of a first resistor, so as to detect a primary current of a current transformer. CONSTITUTION:When a negative lightning surge current flows through a primary winding n1 of a current transformer 6, as a primary current I1 to be detected, only a voltage V1 of 0.7V clamped by a diode D1 is generated at both ends of a resistor R1, and therefore the breakdown of a circuit due to the lightning surge current can be prevented. Although a charge current flows to a capacitor C1 through a resistor R2, on the other side, it is little charged due to a high resistance value of the resistor R2, and a voltage at the opposite ends thereof is very low. Accordingly, the capacitor C1 does not give a discharge current strong enough to offset a counterelectromotive voltage generated in a secondary winding n2 of the current transformer 6, and consequently the counterelectromotive voltage is generated. However, a discriminator 9 is a device to detect a current of negative polarity, and therefore this counterelectromo tive voltage causes no problem does not need to be suppressed particularly.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23346787A JPH0758298B2 (en) | 1987-09-17 | 1987-09-17 | Current detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23346787A JPH0758298B2 (en) | 1987-09-17 | 1987-09-17 | Current detector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6475970A true JPS6475970A (en) | 1989-03-22 |
JPH0758298B2 JPH0758298B2 (en) | 1995-06-21 |
Family
ID=16955486
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23346787A Expired - Lifetime JPH0758298B2 (en) | 1987-09-17 | 1987-09-17 | Current detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0758298B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0510982A (en) * | 1991-06-28 | 1993-01-19 | Kubota Corp | Engine-driven welder |
JP2014119354A (en) * | 2012-12-17 | 2014-06-30 | Fujitsu Telecom Networks Ltd | Current detection circuit |
CN109444522A (en) * | 2018-12-27 | 2019-03-08 | 广州开能电气实业有限公司 | Lightning stroke detection trigger circuit |
CN110907680A (en) * | 2018-09-14 | 2020-03-24 | 台达电子工业股份有限公司 | Current detection device, method and system |
-
1987
- 1987-09-17 JP JP23346787A patent/JPH0758298B2/en not_active Expired - Lifetime
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0510982A (en) * | 1991-06-28 | 1993-01-19 | Kubota Corp | Engine-driven welder |
JP2014119354A (en) * | 2012-12-17 | 2014-06-30 | Fujitsu Telecom Networks Ltd | Current detection circuit |
CN110907680A (en) * | 2018-09-14 | 2020-03-24 | 台达电子工业股份有限公司 | Current detection device, method and system |
US11187728B2 (en) | 2018-09-14 | 2021-11-30 | Delta Electronics, Inc. | Current sensing device, method and system |
CN110907680B (en) * | 2018-09-14 | 2022-03-01 | 台达电子工业股份有限公司 | Current detection device, method and system |
CN109444522A (en) * | 2018-12-27 | 2019-03-08 | 广州开能电气实业有限公司 | Lightning stroke detection trigger circuit |
CN109444522B (en) * | 2018-12-27 | 2024-03-29 | 广州开能电气实业有限公司 | Lightning stroke detection trigger circuit |
Also Published As
Publication number | Publication date |
---|---|
JPH0758298B2 (en) | 1995-06-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment |
Year of fee payment: 13 Free format text: PAYMENT UNTIL: 20080621 |