JPH01117578U - - Google Patents
Info
- Publication number
- JPH01117578U JPH01117578U JP1383288U JP1383288U JPH01117578U JP H01117578 U JPH01117578 U JP H01117578U JP 1383288 U JP1383288 U JP 1383288U JP 1383288 U JP1383288 U JP 1383288U JP H01117578 U JPH01117578 U JP H01117578U
- Authority
- JP
- Japan
- Prior art keywords
- detection signal
- zener
- fault current
- zener diode
- power transmission
- 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
- 238000001514 detection method Methods 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims 3
- 230000003287 optical effect Effects 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 1
Landscapes
- Locating Faults (AREA)
Description
第１図より第４図は本考案の第１より第４の実
施例を示す回路図、第５図および第６図は提案さ
れている送電線の故障電流検出装置を示す回路図
、第７図は計測用信号と更正用信号を示す波形図
、第８図は変流器電流と発光ダイオードの動作電
流の関係を示す説明図。
符号の説明、１……架空地線、２……変流器、
３……負荷抵抗、４，５，２０……ツエナーダイ
オード、７，８，９，１０……整流用ダイオード
、１３……発光ダイオード、２１，２３，２４，
２５……抵抗、２２……ダイオード。
1 to 4 are circuit diagrams showing the first to fourth embodiments of the present invention, FIGS. 5 and 6 are circuit diagrams showing the proposed fault current detection device for power transmission lines, and FIG. The figure is a waveform diagram showing the measurement signal and the correction signal, and FIG. 8 is an explanatory diagram showing the relationship between the current transformer current and the operating current of the light emitting diode. Explanation of symbols, 1...Overhead ground wire, 2...Current transformer,
3... Load resistance, 4, 5, 20... Zener diode, 7, 8, 9, 10... Rectifier diode, 13... Light emitting diode, 21, 23, 24,
25...Resistor, 22...Diode.
Claims (1)
障電流に応じた検出信号を光信号発生手段に供給
して順方向の検出信号に基づいて計測用光信号を
発生し、逆方向の検出信号に基づいて更正用光信
号を発生する送電線の故障電流検出装置において
、 前記検出信号の所定のレベルに対応した第１の
ツエナー電圧を有する第１のツエナーダイオード
と、前記第１のツエナー電圧より小なる第２のツ
エナー電圧を有する第２のツエナーダイオードを
逆方向に直列に接続し、前記検出信号の発生部に
並列に配置されたレベル変換回路と、 前記検出信号が前記第１のツエナー電圧より大
なるとき前記故障電流のレベルに応じ、かつ、前
記検出信号が前記第１のツエナー電圧より小なる
ときの変化率よりも小なる変化率の変化信号を前
記第１のツエナー電圧に付加した検出信号を発生
する検出信号変化率変換回路とを有することを特
徴とする送電線の故障電流検出装置。 (2) 前記検出信号変化率変換回路が、第１のツ
エナーダイオードに直列に挿入された抵抗である
構成の請求項第１項記載の送電線の故障電流検出
装置。 (3) 前記第１のツエナーダイオードおよび前記
抵抗が、前記第１のツエナーダイオードと同じ向
きのダイオードを並列に有する構成の請求項第２
項記載の送電線の故障電流検出装置。 (4) 前記第１のツエナーダイオードおよび前記
抵抗が、２群並列に配置されている構成の請求項
第２項記載の送電線の故障電流検出装置。[Scope of Claim for Utility Model Registration] (1) Detection signals corresponding to forward and reverse fault currents flowing in the overhead ground wire are supplied to an optical signal generating means, and a measuring optical signal is generated based on the forward direction detection signal. and a correction optical signal based on a detection signal in a reverse direction, the first Zener diode having a first Zener voltage corresponding to a predetermined level of the detection signal. and a level conversion circuit in which a second Zener diode having a second Zener voltage smaller than the first Zener voltage is connected in series in the opposite direction and is arranged in parallel to the detection signal generating section; a change signal that corresponds to the level of the fault current when the detection signal is greater than the first Zener voltage and whose rate of change is smaller than the rate of change when the detection signal is smaller than the first Zener voltage; A fault current detection device for a power transmission line, comprising: a detection signal change rate conversion circuit that generates a detection signal added to the first Zener voltage. (2) The fault current detection device for a power transmission line according to claim 1, wherein the detection signal change rate conversion circuit is a resistor inserted in series with a first Zener diode. (3) Claim 2, wherein the first Zener diode and the resistor include a diode in parallel in the same direction as the first Zener diode.
Fault current detection device for power transmission lines as described in . (4) The fault current detection device for a power transmission line according to claim 2, wherein the first Zener diode and the resistor are arranged in two groups in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1383288U JPH0712938Y2 (en) | 1988-02-04 | 1988-02-04 | Transmission line fault current detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1383288U JPH0712938Y2 (en) | 1988-02-04 | 1988-02-04 | Transmission line fault current detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01117578U true JPH01117578U (en) | 1989-08-08 |
| JPH0712938Y2 JPH0712938Y2 (en) | 1995-03-29 |
Family
ID=31224485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1383288U Expired - Lifetime JPH0712938Y2 (en) | 1988-02-04 | 1988-02-04 | Transmission line fault current detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0712938Y2 (en) |
-
1988
- 1988-02-04 JP JP1383288U patent/JPH0712938Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0712938Y2 (en) | 1995-03-29 |
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