JPH0534376A - Current detector - Google Patents
Current detectorInfo
- Publication number
- JPH0534376A JPH0534376A JP3189949A JP18994991A JPH0534376A JP H0534376 A JPH0534376 A JP H0534376A JP 3189949 A JP3189949 A JP 3189949A JP 18994991 A JP18994991 A JP 18994991A JP H0534376 A JPH0534376 A JP H0534376A
- Authority
- JP
- Japan
- Prior art keywords
- transformer
- voltage
- resistance
- temperature compensation
- compensation element
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、配線用遮断器に内蔵
される電流検出装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current detecting device built in a circuit breaker for wiring.
【０００２】[0002]
【従来の技術】従来、配線用遮断器において電路の電流
を検出する電流検出装置として、図４に示す変成器を用
いる方法が一般的である。この変成器は、強磁性体のコ
ア１０にＮ2 ターンの２次巻線１１を施し、巻線保護の
ため外枠ケース１２に入れたもので、貫通穴に１次側と
なる電路２を挿入している。この電路２の電流値の約１
／Ｎ2 の電流が変成器の２次側（２次巻線１１）に流れ
る。2. Description of the Related Art Conventionally, a method using a transformer shown in FIG. 4 has been generally used as a current detecting device for detecting a current in a circuit in a circuit breaker for wiring. In this transformer, a ferromagnetic core 10 is provided with a secondary winding 11 of N 2 turns, and the secondary winding 11 is put in an outer frame case 12 to protect the winding. An electric path 2 on the primary side is provided in a through hole. Inserting. Approximately 1 of the current value of this circuit 2
A current of / N 2 flows to the secondary side (secondary winding 11) of the transformer.
【０００３】この変成器を用いた従来の電流検出装置の
ブロック図を図５に示す。変成器１の２次巻線１１（図
４）の両端に抵抗４を接続し、その抵抗４の両端の電圧
を電圧検出装置５により検出し、その電圧値から信号処
理部１２により電路２に流れる電流を求めることができ
る。A block diagram of a conventional current detecting device using this transformer is shown in FIG. A resistor 4 is connected to both ends of a secondary winding 11 (FIG. 4) of the transformer 1, the voltage across the resistor 4 is detected by a voltage detection device 5, and the signal processing unit 12 outputs the voltage to the electric circuit 2 from the voltage value. The flowing current can be obtained.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら上記従来
の構成によれば、電路２に同じ電流が流れている場合で
も、配線用遮断器内の温度が上昇すると、変成器１の巻
線抵抗が温度上昇によって増加し、この巻線抵抗の増加
により抵抗４の両端の電圧が低下し、正確な電流値を検
出できないという欠点があった。また、配線用遮断器に
変成器を取り付けるときに、抵抗４を接続した２次巻線
１１からなる２次側配線が断線することがある。この２
次側配線が断線し、開放状態になると、高電圧を生じ危
険になるという欠点があった。However, according to the above-mentioned conventional structure, even if the same current is flowing in the electric circuit 2, if the temperature in the circuit breaker for wiring rises, the winding resistance of the transformer 1 will increase. There is a drawback that the current value increases as the winding resistance increases, and the voltage across the resistor 4 decreases due to the increase in the winding resistance, so that an accurate current value cannot be detected. Further, when the transformer is attached to the circuit breaker for wiring, the secondary side wiring including the secondary winding 11 to which the resistor 4 is connected may be broken. This 2
When the secondary wiring is disconnected and opened, a high voltage is generated, which is dangerous.
【０００５】この発明の目的は、周囲温度の変動にかか
わらず電路に流れる電流を正確に検出できるとともに、
配線用遮断器に変成器を内蔵する際に変成器の２次側配
線の断線を防止できる電流検出装置を提供することであ
る。An object of the present invention is to accurately detect a current flowing in an electric circuit regardless of fluctuations in ambient temperature, and
It is an object of the present invention to provide a current detection device capable of preventing disconnection of the secondary side wiring of a transformer when the transformer is built into the circuit breaker for wiring.
【０００６】[0006]
【課題を解決するための手段】この発明の電流検出装置
は、変成器の温度補償素子を電圧信号発生部の抵抗と直
列に挿入し、かつ、温度補償素子および抵抗を変成器の
外枠ケースの外側に配置するとともに、変成器の２次巻
線と抵抗および温度補償素子との接続部を外枠ケース内
に配置し、この外枠ケース内を樹脂封止したことを特徴
とする。In the current detecting device of the present invention, the temperature compensating element of the transformer is inserted in series with the resistor of the voltage signal generating section, and the temperature compensating element and the resistor are provided in the outer casing of the transformer. Of the transformer, and the connection between the secondary winding of the transformer and the resistance and temperature compensating element is arranged inside the outer frame case, and the inside of the outer frame case is sealed with resin.
【０００７】[0007]
【作用】この発明の構成によれば、変成器の温度補償素
子を電圧信号発生部の抵抗と直列に挿入し、かつ、温度
補償素子を変成器の外枠ケースの外側に配置することに
より、温度変化による２次巻線の抵抗値変化を補償する
ことができ、周囲温度の変動にかかわらず電路に流れる
電流を正確に検出できる。また、抵抗および温度補償素
子を変成器の外枠ケースの外側に配置するとともに、２
次巻線と抵抗および温度補償素子との接続部を外枠ケー
ス内に配置し、この外枠ケース内を樹脂封止することに
より、配線用遮断器に変成器を内蔵する際に変成器の２
次側配線の断線を防止することができる。According to the structure of the present invention, the temperature compensating element of the transformer is inserted in series with the resistance of the voltage signal generating section, and the temperature compensating element is arranged outside the outer frame case of the transformer. It is possible to compensate for the change in the resistance value of the secondary winding due to the temperature change, and it is possible to accurately detect the current flowing in the electric path regardless of the change in the ambient temperature. In addition, the resistance and temperature compensation elements are arranged outside the outer frame case of the transformer, and
The connection between the secondary winding and the resistance and temperature compensation element is placed inside the outer case, and the inside of the outer case is sealed with resin so that when the transformer is built into the circuit breaker for wiring, Two
It is possible to prevent disconnection of the secondary wiring.
【０００８】[0008]
〔第１の実施例〕この発明の第１の実施例を図面に基づ
いて説明する。図１(a) はこの発明の第１の実施例の電
流検出装置のブロック図、図１(b)は同電流検出装置
（信号処理部９を除く）の斜視図である。[First Embodiment] A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 (a) is a block diagram of a current detecting device according to a first embodiment of the present invention, and FIG. 1 (b) is a perspective view of the current detecting device (excluding a signal processing section 9).
【０００９】この電流検出装置は配線用遮断器に内蔵さ
れ、電圧信号発生部７と信号処理部９とを備えている。
図１(a) に示すように、電圧信号発生部７は、電路２に
介挿された変成器１と、変成器１の２次巻線の出力端に
直列接続した抵抗４および温度補償素子３と、抵抗４お
よび温度補償素子３の両端に配線１３を接続しその両端
の電圧を検出する電圧検出装置５とからなる。なお、温
度補償素子３は温度上昇に伴って抵抗値が増加する素子
であり、ＰＴＣサーミスタ，感温抵抗器等を用いてい
る。また、図１(b) に示すように、抵抗４および温度補
償素子３は変成器１の外枠ケース１２の外側に取り付け
られ、２次巻線との接続部は外枠ケース１２内に配置さ
れ、外枠ケース１２内には樹脂を流し込んである。This current detection device is built in a circuit breaker for wiring and has a voltage signal generator 7 and a signal processor 9.
As shown in FIG. 1 (a), the voltage signal generator 7 includes a transformer 1 inserted in an electric circuit 2, a resistor 4 and a temperature compensation element connected in series to the output terminal of the secondary winding of the transformer 1. 3 and a voltage detector 5 for connecting a wire 13 to both ends of the resistor 4 and the temperature compensating element 3 and detecting the voltage across the wire 13. The temperature compensating element 3 is an element whose resistance value increases as the temperature rises, and uses a PTC thermistor, a temperature sensitive resistor, or the like. Further, as shown in FIG. 1 (b), the resistor 4 and the temperature compensating element 3 are attached to the outside of the outer casing 12 of the transformer 1, and the connection portion with the secondary winding is arranged in the outer casing 12. The resin is poured into the outer frame case 12.
【００１０】また、信号処理部９は電圧検出装置５で検
出した電圧値（電圧信号）から電路２に流れる電流値を
求めるものである。以上のように構成された電流検出装
置では、周囲温度の上昇により変成器１の２次巻線の抵
抗値が増加するが、温度補償素子３を変成器１の外枠ケ
ース１２に取り付けているため、温度補償素子３も２次
巻線と同じ温度となり抵抗値が増加し、電圧検出装置５
で検出される抵抗４および温度補償素子３の両端の電圧
は補償されることになる。したがって、信号処理部９で
は、周囲温度の変動には影響されない正確な電流値が求
められる。Further, the signal processing section 9 obtains the value of the current flowing through the electric circuit 2 from the voltage value (voltage signal) detected by the voltage detecting device 5. In the current detection device configured as described above, the resistance value of the secondary winding of the transformer 1 increases due to an increase in ambient temperature, but the temperature compensation element 3 is attached to the outer frame case 12 of the transformer 1. Therefore, the temperature compensation element 3 also has the same temperature as the secondary winding and the resistance value increases, so that the voltage detection device 5
The voltage across the resistor 4 and the temperature compensating element 3 detected at is compensated. Therefore, the signal processing unit 9 can obtain an accurate current value that is not affected by the fluctuation of the ambient temperature.
【００１１】また、抵抗４および温度補償素子３を変成
器１の外枠ケース１２の外側に取り付け、２次巻線と抵
抗４および温度補償素子３との接続部を外枠ケース１２
内に配置し、この外枠ケース１２内を樹脂封止すること
により、配線用遮断器に変成器１を内蔵する際に変成器
１の２次側配線の断線を防止することができる。 〔第２の実施例〕この発明の第２の実施例を図面に基づ
いて説明する。Further, the resistor 4 and the temperature compensating element 3 are attached to the outside of the outer frame case 12 of the transformer 1, and the connecting portion between the secondary winding and the resistor 4 and the temperature compensating element 3 is attached to the outer frame case 12.
By arranging the transformer inside, and by sealing the inside of the outer frame case 12 with resin, it is possible to prevent disconnection of the secondary side wiring of the transformer 1 when the transformer 1 is built in the circuit breaker for wiring. [Second Embodiment] A second embodiment of the present invention will be described with reference to the drawings.
【００１２】図２(a) はこの発明の第２の実施例の電流
検出装置のブロック図、図２(b) は同電流検出装置（信
号処理部９を除く）の斜視図である。この電流検出装置
において、第１の実施例と異なる点は、電圧信号発生部
７に代えて、電圧信号発生部８を用いていることであ
る。この電圧信号発生部８は、第１の実施例で用いた温
度補償素子３に代えて温度補償素子６を用い、電圧検出
装置５により抵抗４の両端の電圧を検出するようにして
いる。なお、温度補償素子６は温度上昇に伴って抵抗値
が低下する素子であり、ＮＴＣサーミスタ等を用いてい
る。その他の構成は第１の実施例と同様である。FIG. 2 (a) is a block diagram of a current detecting device according to a second embodiment of the present invention, and FIG. 2 (b) is a perspective view of the current detecting device (excluding the signal processing section 9). This current detection device differs from the first embodiment in that a voltage signal generator 8 is used instead of the voltage signal generator 7. The voltage signal generator 8 uses a temperature compensating element 6 instead of the temperature compensating element 3 used in the first embodiment, and the voltage detecting device 5 detects the voltage across the resistor 4. The temperature compensating element 6 is an element whose resistance value decreases as the temperature rises, and uses an NTC thermistor or the like. The other structure is similar to that of the first embodiment.
【００１３】以上のように構成された電流検出装置で
は、周囲温度の上昇により変成器１の２次巻線の抵抗値
が増加する。しかし、外枠ケース１２に取り付けられた
温度補償素子６は、温度上昇により抵抗値が減少する。
このため、電圧検出装置５で検出される抵抗４の両端の
電圧は補償されることになる。したがって、信号処理部
９では、周囲温度の変動には影響されない正確な電流値
が求められる。In the current detecting device configured as described above, the resistance value of the secondary winding of the transformer 1 increases as the ambient temperature rises. However, the resistance value of the temperature compensating element 6 attached to the outer frame case 12 decreases as the temperature rises.
Therefore, the voltage across the resistor 4 detected by the voltage detection device 5 is compensated. Therefore, the signal processing unit 9 can obtain an accurate current value that is not affected by the fluctuation of the ambient temperature.
【００１４】また、第１の実施例と同様、配線用遮断器
に変成器１を内蔵する際に変成器１の２次側配線の断線
を防止することができる。なお、上記実施例の電流検出
装置を配線用遮断器に内蔵した断面図を図３に示してお
く。Further, as in the first embodiment, when the transformer 1 is built in the circuit breaker for wiring, the disconnection of the secondary wiring of the transformer 1 can be prevented. Note that FIG. 3 shows a cross-sectional view in which the current detecting device of the above embodiment is built in a circuit breaker for wiring.
【００１５】[0015]
【発明の効果】この発明の電流検出装置は、変成器の温
度補償素子を電圧信号発生部の抵抗と直列に挿入し、か
つ、温度補償素子を変成器の外枠ケースの外側に配置す
ることにより、温度変化による２次巻線の抵抗値変化を
補償することができ、周囲温度の変動にかかわらず電路
に流れる電流を正確に検出することができる。また、抵
抗および温度補償素子を変成器の外枠ケースの外側に配
置するとともに、２次巻線と抵抗および温度補償素子と
の接続部を外枠ケース内に配置し、この外枠ケース内を
樹脂封止することにより、配線用遮断器に変成器を内蔵
する際に変成器の２次側配線の断線を防止することがで
きる。According to the current detecting device of the present invention, the temperature compensating element of the transformer is inserted in series with the resistance of the voltage signal generating portion, and the temperature compensating element is arranged outside the outer casing of the transformer. Thus, it is possible to compensate for the change in the resistance value of the secondary winding due to the temperature change, and it is possible to accurately detect the current flowing in the electric path regardless of the change in the ambient temperature. Further, the resistance and temperature compensation elements are arranged outside the outer frame case of the transformer, and the connecting portion between the secondary winding and the resistance and temperature compensation element is arranged inside the outer frame case. The resin sealing can prevent disconnection of the secondary side wiring of the transformer when the transformer is built in the circuit breaker for wiring.
【図１】(a) はこの発明の第１の実施例の電流検出装置
のブロック図、(b) は同電流検出装置（信号処理部９を
除く）の斜視図である。FIG. 1A is a block diagram of a current detection device according to a first embodiment of the present invention, and FIG. 1B is a perspective view of the current detection device (excluding a signal processing unit 9).
【図２】(a) はこの発明の第２の実施例の電流検出装置
のブロック図、(b) は同電流検出装置（信号処理部９を
除く）の斜視図である。2A is a block diagram of a current detection device according to a second embodiment of the present invention, and FIG. 2B is a perspective view of the current detection device (excluding a signal processing unit 9).
【図３】この発明の第１，第２の実施例の電流検出装置
を配線用遮断器に内蔵した断面図である。FIG. 3 is a cross-sectional view in which the current detecting devices of the first and second embodiments of the present invention are built in a circuit breaker for wiring.
【図４】従来の電流検出装置の変成器を示す図である。FIG. 4 is a diagram showing a transformer of a conventional current detection device.
【図５】従来の電流検出装置のブロック図である。FIG. 5 is a block diagram of a conventional current detection device.
１ 変成器 ２ 電路 ３，６ 温度補償素子 ４ 抵抗 ７，８ 電圧信号発生部 ９ 信号処理部 １２ 外枠ケース 1 Transformer 2 Electric Circuit 3,6 Temperature Compensation Element 4 Resistance 7,8 Voltage Signal Generator 9 Signal Processor 12 Outer Case
Claims (1)
しこの変成器の２次巻線に抵抗を接続し前記電路を流れ
る電流に対応した電圧信号を発生する電圧信号発生部
と、この電圧信号発生部の電圧信号から前記電路に流れ
る電流を求める信号処理部とを備えた電流検出装置にお
いて、 前記変成器の温度補償素子を前記電圧信号発生部の前記
抵抗と直列に挿入し、かつ、前記温度補償素子および前
記抵抗を前記変成器の外枠ケースの外側に配置するとと
もに、前記変成器の２次巻線と前記抵抗および前記温度
補償素子との接続部を前記外枠ケース内に配置し、この
外枠ケース内を樹脂封止したことを特徴とする電流検出
装置。Claim: What is claimed is: 1. A voltage for generating a voltage signal corresponding to a current flowing in the electric path, wherein a transformer having an outer casing is inserted in the electric path and a resistor is connected to a secondary winding of the transformer. In a current detection device comprising a signal generation unit and a signal processing unit that obtains a current flowing in the electric path from a voltage signal of the voltage signal generation unit, a temperature compensation element of the transformer is connected to the resistance of the voltage signal generation unit. It is inserted in series and the temperature compensation element and the resistor are arranged outside the outer casing of the transformer, and a connection between the secondary winding of the transformer and the resistor and the temperature compensation element is provided. A current detecting device, wherein the current detecting device is arranged in the outer frame case, and the inside of the outer frame case is resin-sealed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3189949A JPH0534376A (en) | 1991-07-30 | 1991-07-30 | Current detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3189949A JPH0534376A (en) | 1991-07-30 | 1991-07-30 | Current detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0534376A true JPH0534376A (en) | 1993-02-09 |
Family
ID=16249896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3189949A Pending JPH0534376A (en) | 1991-07-30 | 1991-07-30 | Current detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0534376A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012202844A (en) * | 2011-03-25 | 2012-10-22 | Mitsubishi Electric Corp | Current detector |
| CN110361587A (en) * | 2019-08-07 | 2019-10-22 | 珠海格力电器股份有限公司 | A kind of over-current detection circuit with temperature-compensating |
-
1991
- 1991-07-30 JP JP3189949A patent/JPH0534376A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012202844A (en) * | 2011-03-25 | 2012-10-22 | Mitsubishi Electric Corp | Current detector |
| CN110361587A (en) * | 2019-08-07 | 2019-10-22 | 珠海格力电器股份有限公司 | A kind of over-current detection circuit with temperature-compensating |
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