JPS6355288B2 - - Google Patents
Info
- Publication number
- JPS6355288B2 JPS6355288B2 JP56205760A JP20576081A JPS6355288B2 JP S6355288 B2 JPS6355288 B2 JP S6355288B2 JP 56205760 A JP56205760 A JP 56205760A JP 20576081 A JP20576081 A JP 20576081A JP S6355288 B2 JPS6355288 B2 JP S6355288B2
- Authority
- JP
- Japan
- Prior art keywords
- output
- current
- overcurrent
- capacitor
- current detection
- 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.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 32
- 239000003990 capacitor Substances 0.000 claims description 19
- 230000005669 field effect Effects 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000009429 electrical wiring Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は過電流警報装置に関するものであ
り、特に過電流値に応じた遅延時間で警報を発生
させ且つ過電流の消失と同時に警報の発生を停止
されるようにした過電流警報装置に関するもので
ある。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an overcurrent alarm device, and particularly to an overcurrent alarm device that generates an alarm with a delay time depending on the overcurrent value and simultaneously generates the alarm when the overcurrent disappears. The present invention relates to an overcurrent alarm device that is configured to shut down the current.
［従来の技術］
第１図は従来の過電流警報装置を示すブロツク
線図である。第１図において、電流センサ１は例
えば変流器であり、電路２を流れる電流値を検出
するものである。過電流引外し装置３は電流セン
サ１の出力が所定値を越えると、電路２に接続さ
れた回路しや断器４と引外すものである。電流検
出装置５は電流センサ１の出力が所定値を越える
と電流センサ１の出力に比例した出力を生じるも
のである。コンデン６は電流検出装置５に接続さ
れ電流検出装置５の出力電流によつて充電される
もので、電路２を流れる電流値が大きい程速く充
電されるものである。比較装置７はコンデンサ６
の充電電圧と設定電圧とを比較し、コンデンサ６
の充電電圧が設定電圧より高くなると出力を生じ
るものである。警報装置８は比較装置７の出力に
より付勢され警報の発生もしくは表示をするもの
である。[Prior Art] FIG. 1 is a block diagram showing a conventional overcurrent alarm device. In FIG. 1, a current sensor 1 is, for example, a current transformer, and detects the value of a current flowing through an electric line 2. As shown in FIG. The overcurrent trip device 3 trips the circuit connected to the electric line 2 and the circuit breaker 4 when the output of the current sensor 1 exceeds a predetermined value. The current detection device 5 generates an output proportional to the output of the current sensor 1 when the output of the current sensor 1 exceeds a predetermined value. The capacitor 6 is connected to the current detection device 5 and charged by the output current of the current detection device 5, and the larger the value of the current flowing through the electric line 2, the faster the capacitor 6 is charged. Comparison device 7 is capacitor 6
Compare the charging voltage of capacitor 6 with the set voltage.
When the charging voltage becomes higher than the set voltage, an output is generated. The alarm device 8 is energized by the output of the comparator 7 and generates or displays an alarm.
次にこの動作を説明する。今、電路２に過電流
が流れるとこの過電流を電流センサ１が検出し、
電流検出装置５は電流センサ１の出力が所定値以
上であると電流センサ１の出力に比例した出力を
生じ、コンデンサ６を充電する。従つて、過電流
値が高い程コンデンサ６の充電速度は速く、比較
装置７は過電流値が高い程、短い遅延時間で出力
を生じ、警報装置８を付勢する。一方、過電流引
外し装置３は電流センサ１の出力が所定値以上に
なると回路しや断器４を引外し、電路２に流れる
電流をしや断する。このため電流センサ１は出力
を生じず、警報装置８は消勢される。 Next, this operation will be explained. Now, when an overcurrent flows through the electric line 2, the current sensor 1 detects this overcurrent,
The current detection device 5 generates an output proportional to the output of the current sensor 1 and charges the capacitor 6 when the output of the current sensor 1 is equal to or higher than a predetermined value. Therefore, the higher the overcurrent value is, the faster the charging speed of the capacitor 6 is, and the higher the overcurrent value is, the faster the comparator 7 produces an output with a shorter delay time and energizes the alarm device 8. On the other hand, when the output of the current sensor 1 exceeds a predetermined value, the overcurrent tripping device 3 trips the circuit breaker 4 and interrupts the current flowing through the electric line 2. Therefore, the current sensor 1 produces no output and the alarm device 8 is deenergized.
［発明が解決しようとする問題点］
しかしながら従来の装置は上記のように構成さ
れているため、回路しや断器４が引外され電流セ
ンサ１が出力を生じなくなつても、コンデンサ６
の充電電圧が比較装置７で比較される設定電圧以
下に下がるのに時間を要し、ただちに警報装置８
を消勢できない欠点があつた。また、電路２を流
れる電流値が瞬間的に大きくなり、回路しや断器
４が引外される前に平常状態に戻つても、警報装
置８を直ちに消勢できない欠点があつた。[Problems to be Solved by the Invention] However, since the conventional device is configured as described above, even if the circuit breaker 4 is tripped and the current sensor 1 no longer produces an output, the capacitor 6
It takes time for the charging voltage of
There was a drawback that it could not be quenched. Further, even if the current value flowing through the electric line 2 momentarily increases and the circuit returns to a normal state before the circuit breaker 4 is tripped, the alarm device 8 cannot be immediately deactivated.
この発明は上記のような従来のものの欠点を除
去するためになされたものである。 This invention was made in order to eliminate the drawbacks of the conventional ones as described above.
［問題点を解決するための手段］
この発明に係る過電流警報装置は、電路を流れ
る電流を検出する電流センサ、前記電流センサの
出力が所定値以上であるとき、前記出力に比例し
た出力を生じる電流検出装置、前記電流検出装置
の出力により充電されるコンデンサ、前記電流検
出装置の出力電圧がある間これに応動して出力を
出す検出判定回路、前記検出判定回路の出力発生
期間中には設定値を低くまた前記検出判定回路の
無出力期間中には設定値を高く切替えて設定する
基準値設定装置、前記コンデンサの充電電圧と前
記基準値設定装置の設定値とを比較し、前記充電
電圧が前記設定値より高ければ出力を生ずる比較
装置、前記比較装置の出力によつて動作する警報
装置を備えている。[Means for Solving the Problems] An overcurrent alarm device according to the present invention includes a current sensor that detects a current flowing through an electric circuit, and when the output of the current sensor is equal to or higher than a predetermined value, an output proportional to the output is provided. a current detection device that is generated, a capacitor that is charged by the output of the current detection device, a detection judgment circuit that outputs an output in response to the output voltage of the current detection device, and a detection judgment circuit that outputs an output in response to the output voltage of the current detection device; a reference value setting device that switches the set value to a low value and switches the set value to a high value during the non-output period of the detection/judgment circuit; compares the charging voltage of the capacitor with the set value of the reference value setting device; The device includes a comparator that produces an output if the voltage is higher than the set value, and an alarm device that is activated by the output of the comparator.
［作用］
この発明の過電流警報装置は、電流が所定値以
上になると、電流値に比例した電流検出装置の出
力により電流値に反比例した速度でコンデンサを
充電し、この充電電圧が、電流検出装置の出力に
より動作する検出判定回路の出力で低く切換設定
された基準値設定装置の設定値より相対的に高く
なると、警報装置を付勢する。[Function] When the current exceeds a predetermined value, the overcurrent alarm device of the present invention charges the capacitor at a speed inversely proportional to the current value by the output of the current detection device that is proportional to the current value, and this charging voltage is used to detect the current. When the output of the detection/judgment circuit operated by the output of the device becomes relatively higher than the set value of the reference value setting device, which has been switched to a lower value, the alarm device is energized.
［実施例］
以下この発明の一実施例を図について説明す
る。[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.
第２図はこの発明に係る過電流警報装置の一実
施例を示す電気結線図である。図中第１図と同一
部分には同一符号を付している。第２図におい
て、比較装置７は電界効果トランジスタ７０１で
構成され、そのゲートはコンデンサ６に接続され
てコンデンサ６の充電電圧が印加され、そのドレ
インは警報装置８に接続され、そのソースは基準
値設定装置９に接続されている。基準値設定装置
９は比較装置７がコンデンサ６の充電電圧を比較
する基準値を設定するもので電界効果トランジス
タ７０１のソースとアース間に接続されたツエナ
ーダイオード９０１と抵抗９０２との直列回路
と、抵抗９０２に並列接続されたトランジスタ９
０３と、電流検出装置５の出力発生期間中、付勢
されてトランジスタ９０３を導通させる出力を生
じる検出判定回路９０４とから構成されている。
定電圧装置１０は警報装置８に定電圧を印加する
と共に、抵抗１１を介してツエナーダイオード９
０１と抵抗９０２との直列回路に定電圧を印加し
ている。 FIG. 2 is an electrical wiring diagram showing an embodiment of the overcurrent alarm device according to the present invention. In the figure, the same parts as in FIG. 1 are given the same reference numerals. In FIG. 2, the comparator 7 consists of a field effect transistor 701, the gate of which is connected to the capacitor 6 to which the charging voltage of the capacitor 6 is applied, the drain of which is connected to the alarm device 8, and the source of which is connected to the reference value. It is connected to the setting device 9. The reference value setting device 9 sets a reference value with which the comparator 7 compares the charging voltage of the capacitor 6, and includes a series circuit of a Zener diode 901 and a resistor 902 connected between the source of a field effect transistor 701 and the ground; Transistor 9 connected in parallel to resistor 902
03, and a detection/judgment circuit 904 that is energized and produces an output that makes the transistor 903 conductive during the output generation period of the current detection device 5.
The constant voltage device 10 applies a constant voltage to the alarm device 8 and also applies a constant voltage to the Zener diode 9 via a resistor 11.
A constant voltage is applied to a series circuit of 01 and resistor 902.
次にこの動作を説明する。今、電路２に過電流
が流れると、電流センサ１を介して電流検出装置
５が過電流を検出してコンデンサ６を充電する。 Next, this operation will be explained. Now, when an overcurrent flows through the electric line 2, the current detection device 5 detects the overcurrent via the current sensor 1 and charges the capacitor 6.
この時、検出判定回路９０４は、電流検出装置
５の出力により付勢されてトランジスタ９０３を
導通させ、電界効果トランジスタ７０１のソース
にツエナードイオード９０１のみで定まる第１の
設定電圧を印加する。コンデンサ６の充電電圧が
この第１の設定電圧に近づくと、電界効果トラン
ジスタ７０１は導通して警報装置８を付勢し、警
報の発生もしくは表示をする。 At this time, the detection/judgment circuit 904 is energized by the output of the current detection device 5 to make the transistor 903 conductive, and applies a first set voltage determined only by the Zenard diode 901 to the source of the field effect transistor 701 . When the charging voltage of the capacitor 6 approaches this first set voltage, the field effect transistor 701 becomes conductive and energizes the alarm device 8 to generate or display an alarm.
一方、過電流引外し装置３は電流センサ１の出
力が所定値以上になると回路しや断器４を引外し
電路２に流れる電流をしや断する。このため電流
検出装置５は無出力となり、検出判定回路９０４
は消勢されてトランジスタ９０３を不導通にす
る。 On the other hand, when the output of the current sensor 1 exceeds a predetermined value, the overcurrent tripping device 3 trips the circuit breaker 4 and interrupts the current flowing through the electrical circuit 2. Therefore, the current detection device 5 has no output, and the detection judgment circuit 904
is deenergized, rendering transistor 903 non-conductive.
トランジスタ９０３が不導通になると、電界効
果トランジスタ７０１のソースにはツエナードイ
オード９０１と抵抗９０２との直列回路が接続さ
れ、ツエナーダイオード９０１で定まる第１の設
定電圧に抵抗９０２の電圧降下が加わつた第２の
設定電圧を印加する。このためコンデンサ６の充
電電圧は即座に第２の設定電圧より低くなり、電
界効果トランジスタ７０１は不導通となつて警報
装置８を消勢する。また、電路２を流れる電流値
が瞬間的に大きくなり、回路しや断器４が引外さ
れる前に平常状態に戻つた場合にも、警報装置８
を直ちに消勢することができる。 When the transistor 903 becomes non-conductive, a series circuit of the Zener diode 901 and the resistor 902 is connected to the source of the field effect transistor 701, and the voltage drop across the resistor 902 is added to the first set voltage determined by the Zener diode 901. Applying a second set voltage. Therefore, the charging voltage of the capacitor 6 immediately becomes lower than the second set voltage, and the field effect transistor 701 becomes non-conductive, deactivating the alarm device 8. In addition, even if the current value flowing through the electric line 2 momentarily increases and returns to a normal state before the circuit or disconnector 4 is tripped, the alarm device 8
can be immediately deactivated.
なお上記実施例では過電流引外し装置３及び電
流検出装置５に夫々別個に所定値を設定するよう
にしたが、何れか一方に設けて両者で共用するよ
うにしてもよい。 In the above embodiment, the predetermined values are set separately for the overcurrent trip device 3 and the current detection device 5, but the predetermined values may be set for either one and shared by both.
［発明の効果］
以上のようにこの発明によれば、電流検出装置
の出力期間中には、基準値設定装置の設定値を低
くし、無出力期間中には、設定値を高く切替える
ため、過電流が解除されると直ちに警報装置を消
勢することができ、過電流情報が細かに得られる
効果を有する。[Effects of the Invention] As described above, according to the present invention, the set value of the reference value setting device is set low during the output period of the current detection device, and the set value is switched to a high value during the non-output period. As soon as the overcurrent is released, the alarm device can be deactivated, which has the effect of obtaining detailed overcurrent information.
第１図は従来の過電流警報装置を示すブロツク
線図、第２図はこの発明に係る過電流警報装置の
一実施例を示す電気結線図である。
図において、各図中同一部分は同一符号を付し
ており、１は電流センサ、２は電路、３は過電流
引外し装置、４は回路しや断器、５は電流検出装
置、６はコンデンサ、７は比較装置、７０１は電
界効果トランジスタ、８は警報装置、９は基準値
設定装置、９０１はツエナーダイオード、９０２
は抵抗、９０３はトランジスタ、９０４は検出判
定回路、１０は定電圧装置、１１は抵抗である。
FIG. 1 is a block diagram showing a conventional overcurrent warning device, and FIG. 2 is an electrical wiring diagram showing an embodiment of the overcurrent warning device according to the present invention. In the figures, the same parts in each figure are given the same symbols, 1 is the current sensor, 2 is the electric circuit, 3 is the overcurrent tripping device, 4 is the circuit breaker, 5 is the current detection device, and 6 is the current detection device. A capacitor, 7 a comparator, 701 a field effect transistor, 8 an alarm device, 9 a reference value setting device, 901 a Zener diode, 902
is a resistor, 903 is a transistor, 904 is a detection/judgment circuit, 10 is a constant voltage device, and 11 is a resistor.
Claims (1)
記電流センサの出力が所定値以上であるとき、前
記出力に比例した出力を生じる電流検出装置、 前記電流検出装置の出力により充電されるコン
デンサ、 前記電流検出装置の出力電圧がある間これに応
動して出力を出す検出判定回路、 前記検出判定回路の出力発生期間中には設定値
を低くまた前記検出判定回路の無出力期間中には
設定値を高く切替えて設定する基準値設定装置、 前記コンデンサの充電電圧と前記基準値設定装
置の設定値とを比較し、前記充電電圧が前記設定
値より高ければ出力を生ずる比較装置、 前記比較装置の出力によつて動作する警報装置
を備えたことを特徴とする過電流警報装置。 ２ 基準値設定装置は、ツエナーダイオードと抵
抗との直列回路、 前記抵抗に並列接続され、電流検出装置の出力
発生期間中付勢されて導通する半導体素子、 からなる特許請求の範囲第１項記載の過電流警報
装置。 ３ 比較装置は、コンデンサの充電電圧がゲート
に印加され、基準値設定装置がソースに接続さ
れ、警報装置がドレインに接続された電界効果ト
ランジスタで構成された特許請求の範囲第１項ま
たは第２項記載の過電流警報装置。[Scope of Claims] 1. A current sensor that detects a current flowing through an electric circuit, a current detection device that generates an output proportional to the output when the output of the current sensor is equal to or higher than a predetermined value, and charging by the output of the current detection device. a detection judgment circuit that outputs an output in response to the output voltage of the current detection device while there is an output voltage; a set value is set low during the output generation period of the detection judgment circuit, and a set value is set low during the non-output period of the detection judgment circuit. It includes a reference value setting device that switches and sets a higher set value, and a comparison device that compares the charging voltage of the capacitor with the set value of the reference value setting device and generates an output if the charging voltage is higher than the set value. . An overcurrent alarm device comprising: an alarm device activated by the output of the comparison device. 2. The reference value setting device comprises: a series circuit of a Zener diode and a resistor; and a semiconductor element connected in parallel to the resistor and energized to conduct during the output generation period of the current detection device. Overcurrent warning device. 3. Claim 1 or 2, wherein the comparator is constituted by a field effect transistor to which the charging voltage of the capacitor is applied to the gate, the reference value setting device is connected to the source, and the alarm device is connected to the drain. Overcurrent warning device as described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20576081A JPS58107018A (en) | 1981-12-18 | 1981-12-18 | Overcurrent warning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20576081A JPS58107018A (en) | 1981-12-18 | 1981-12-18 | Overcurrent warning device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58107018A JPS58107018A (en) | 1983-06-25 |
| JPS6355288B2 true JPS6355288B2 (en) | 1988-11-01 |
Family
ID=16512206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20576081A Granted JPS58107018A (en) | 1981-12-18 | 1981-12-18 | Overcurrent warning device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58107018A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5481062A (en) * | 1977-12-12 | 1979-06-28 | Hitachi Ltd | Relay |
-
1981
- 1981-12-18 JP JP20576081A patent/JPS58107018A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5481062A (en) * | 1977-12-12 | 1979-06-28 | Hitachi Ltd | Relay |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58107018A (en) | 1983-06-25 |
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