JP3015484B2 - Harmonic detection alarm - Google Patents
Harmonic detection alarmInfo
- Publication number
- JP3015484B2 JP3015484B2 JP3050831A JP5083191A JP3015484B2 JP 3015484 B2 JP3015484 B2 JP 3015484B2 JP 3050831 A JP3050831 A JP 3050831A JP 5083191 A JP5083191 A JP 5083191A JP 3015484 B2 JP3015484 B2 JP 3015484B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- alarm
- signal
- circuit
- output
- 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 - Lifetime
Links
Landscapes
- Emergency Alarm Devices (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、受配電線等における
高調波電流や高調波電圧を検出し、高調波成分の含有率
や電圧歪率が設定値を超えると警報を発する警報装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm device which detects a harmonic current or a harmonic voltage in a power distribution line or the like and issues an alarm when the content of a harmonic component or a voltage distortion exceeds a set value.
【０００２】[0002]
【従来の技術】受配電線等において電流や電圧に高調波
成分が多く含まれていると、進相コンデンサの過負荷に
よる異常加熱、回転機の異常振動、電子機器の誤動作な
ど種々のトラブルが生ずる。このため、電源波形の高調
波成分が一定の大きさを超えないように監視すると共
に、超えた場合には適切な処置を実施する必要がある。
本出願人らは、このような目的に供するために取扱いが
容易な高調波測定計を先に提案している(例えば実開昭6
4-46764号公報参照)。これを用いれば、高調波を含んだ
合成波から高調波成分を取り出してその大きさを監視す
ることができ、また一定の大きさを超えた場合に自動的
に警報を発することが可能である。2. Description of the Related Art If a receiving line or the like contains a large amount of harmonic components in a current or a voltage, various troubles such as abnormal heating due to overload of a phase-advancing capacitor, abnormal vibration of a rotating machine, and malfunction of an electronic device occur. . For this reason, it is necessary to monitor the harmonic component of the power supply waveform so as not to exceed a certain value, and to take appropriate measures when the harmonic component exceeds the predetermined value.
The present applicants have previously proposed a harmonic measurement instrument that is easy to handle for such a purpose (for example,
4-46764). By using this, it is possible to take out the harmonic component from the synthesized wave including the harmonic and monitor its magnitude, and it is possible to automatically issue an alarm when the magnitude exceeds a certain magnitude. .
【０００３】[0003]
【発明が解決しようとする課題】上記のような警報装置
としては、監視されるべき高調波成分の大きさを設定電
圧(基準電圧)と比較し、高調波成分が基準電圧を超える
と警報を発するようにしたものが一般的である。しかし
ながら、このような装置の場合には高調波成分が少しで
も設定値を超えると直ちに警報が発せられる。このた
め、設定値が低過ぎると警報の頻度が高くなるし、逆に
設定値が高過ぎると必要な警報が発せられなくなるとい
う事態を生じやすく、警報点をどの点に設定するかの判
断が困難で実用面における問題点の一つとなっていた。
この発明はこのような問題に着目し、高調波成分の大き
さに応じて実質的な設定値を変動させるようにし、適切
に警報を発することのできる検出警報装置を提供するこ
とを目的としてなされたものである。As an alarm device as described above, the magnitude of a harmonic component to be monitored is compared with a set voltage (reference voltage), and an alarm is issued when the harmonic component exceeds the reference voltage. It is common to emit one. However, in such a device, an alarm is issued as soon as the harmonic component slightly exceeds the set value. For this reason, if the set value is too low, the frequency of alarms will increase.On the other hand, if the set value is too high, the necessary alarms will not be likely to be issued, and it is difficult to determine which alarm point to set. It was difficult and one of the practical problems.
The present invention pays attention to such a problem, and has an object to provide a detection / warning apparatus that can change a substantial set value according to the magnitude of a harmonic component and can appropriately generate a warning. It is a thing.
【０００４】[0004]
【課題を解決するための手段】上述の目的を達成するた
めに、この発明の高調波検出警報装置では、高調波を含
んだ合成波から高調波成分を取り出し、波形整形して上
記合成波に含まれる高調波成分に対応した大きさの信号
電圧を出力する信号電圧発生回路と、信号電圧の大きさ
があらかじめ設定された設定値を超えると経時的に上昇
または下降する基準電圧を出力する基準電圧発生回路
と、信号電圧に対応した大きさの被比較電圧を出力する
と共に、信号電圧が設定値を超えた場合には信号電圧と
設定値との差が大きいほど出力される上記被比較電圧を
下降または上昇させる被比較電圧発生回路と、上記基準
電圧と上記被比較電圧とを比較し、被比較電圧と基準電
圧のレベルが逆転すると警報信号を出力する比較回路
と、この比較回路の警報信号により警報を発する警報手
段、とを設けている。In order to achieve the above-mentioned object, a harmonic detection and alarm device according to the present invention takes out a harmonic component from a composite wave containing harmonics, shapes the waveform, and forms a waveform into the composite wave. A signal voltage generation circuit that outputs a signal voltage of a magnitude corresponding to the contained harmonic component, and a reference that outputs a reference voltage that rises or falls with time when the magnitude of the signal voltage exceeds a preset value A voltage generating circuit for outputting a voltage to be compared having a magnitude corresponding to the signal voltage, and, when the signal voltage exceeds a set value, outputting as the difference between the signal voltage and the set value is larger, A reference voltage generating circuit for lowering or increasing the reference voltage, a comparison circuit for comparing the reference voltage and the reference voltage, and outputting an alarm signal when the levels of the reference voltage and the reference voltage are reversed, and an alarm of the comparison circuit. Alarm means for issuing an alarm by a signal is provided and.
【０００５】[0005]
【作用】高調波成分の大きさに対応した信号電圧が設定
値を超えても、そのレベルが低い場合には被比較電圧が
高くなり、この電圧と基準電圧のレベルが逆転するまで
の時間が長くなって警報信号の出力が遅くなる。従っ
て、それまでに信号電圧が設定値以下に戻ると警報信号
は出力されない。一方、信号電圧のレベルが高い場合に
は被比較電圧が低くなり、基準電圧とのレベルが逆転す
るまでの時間が短くなって警報信号が早く出力される。
従って、信号電圧が設定値を超えた後、警報信号が出力
されないうちに設定値以下に戻ることのできる時間は信
号レベルが高いほど短くなり、設定値を超えると直ちに
警報信号が出力されるようになる。[Function] Even if the signal voltage corresponding to the magnitude of the harmonic component exceeds the set value, if the level is low, the voltage to be compared becomes high, and the time until this voltage and the level of the reference voltage reverse is reversed. It becomes longer and the output of the alarm signal becomes slower. Therefore, if the signal voltage returns to the set value or less by that time, no alarm signal is output. On the other hand, when the level of the signal voltage is high, the voltage to be compared becomes low, the time until the level is inverted with respect to the reference voltage becomes short, and the alarm signal is output quickly.
Therefore, after the signal voltage exceeds the set value, the time during which the signal can return to the set value or less before the alarm signal is output becomes shorter as the signal level becomes higher, and the alarm signal is output immediately when the signal level exceeds the set value. become.
【０００６】すなわち、信号電圧が設定値を超える程度
に応じて実質的な設定値が自動的に変動することにな
り、信号電圧が設定値をわずかに超えただけで直ちに警
報が発せられることはなく、また信号電圧が設定値を大
きく超えた場合には直ちに警報が発せられるので、高調
波成分の大きさに応じた適切な警報が発せられ、検出警
報装置の実用性が向上されるのである。In other words, the actual set value automatically fluctuates in accordance with the extent to which the signal voltage exceeds the set value, and an alarm is issued immediately when the signal voltage slightly exceeds the set value. If the signal voltage greatly exceeds the set value, an alarm is issued immediately, so that an appropriate alarm is issued according to the magnitude of the harmonic component, and the practicality of the detection alarm device is improved. .
【０００７】[0007]
【実施例】次に、図示の一実施例について説明する。図
１は装置全体のブロック図、図２は警報発生部の回路
図、図３はその動作説明図である。図１において、１は
合成波入力端子、２は信号電圧発生回路、３は基準電圧
発生回路、４は被比較電圧発生回路、５は比較回路、６
は警報手段である。Next, one embodiment shown in the drawings will be described. FIG. 1 is a block diagram of the entire apparatus, FIG. 2 is a circuit diagram of an alarm generator, and FIG. In FIG. 1, 1 is a composite wave input terminal, 2 is a signal voltage generation circuit, 3 is a reference voltage generation circuit, 4 is a voltage to be compared, 5 is a comparison circuit, 6
Is an alarm means.
【０００８】信号電圧発生回路２は、基本波抽出回路２
１、減算回路２２、波形整形回路２３等を備えたもので
あり、合成波入力端子１を監視対象の受配電線等に接続
し、これから入力される高調波を含んだ合成波からまず
基本波抽出回路２１で基本波を取り出す。そしてこの基
本波と合成波とを減算回路２２で減算処理して合成波に
含まれていた高調波成分のみを取り出し、これを波形整
形回路２３で波形整形して高調波成分の大きさに応じた
レベルの信号電圧Ｖ0を得るように構成されている。な
お、この信号電圧発生回路２は例えば前述の公開公報に
開示されているような回路構成が採用でき、取り出す高
調波成分としては全高調波を含んだ複合高調波成分と、
特定周波数の単一高調波成分のいずれかを任意に選択で
きるようにすることが望ましい。The signal voltage generation circuit 2 includes a fundamental wave extraction circuit 2
1, a subtraction circuit 22, a waveform shaping circuit 23, and the like. The composite wave input terminal 1 is connected to a receiving and distribution line or the like to be monitored, and a fundamental wave is first extracted from a composite wave including harmonics to be input. The fundamental wave is extracted by the circuit 21. Then, the fundamental wave and the composite wave are subtracted by the subtraction circuit 22 to extract only the harmonic components contained in the composite wave, and the waveform is shaped by the waveform shaping circuit 23 so as to be in accordance with the magnitude of the harmonic component. It is configured to obtain a signal voltage V 0 of a different level. The signal voltage generation circuit 2 can adopt a circuit configuration as disclosed in the above-mentioned publication, for example, and the extracted harmonic components include a composite harmonic component including all harmonics,
It is desirable to be able to arbitrarily select any of the single harmonic components of a specific frequency.
【０００９】次に、図２及び図３により警報発生部につ
いて説明する。図２において、７は可変抵抗Ｒ0及び抵
抗Ｒ1〜Ｒ7の直列回路で構成された動作レベル設定回路
である。基準電圧発生回路３は比較器３１、抵抗３２と
コンデンサ３３及びダイオードＤ1からなる積分回路を
備えている。比較器３１は動作レベル設定回路７の可変
抵抗Ｒ0の端子電圧が基準電圧として与えられ、また信
号電圧発生回路２から出力される信号電圧Ｖ0が与えら
れており、その出力電圧を積分して得られるコンデンサ
３３の端子電圧Ｖ1が比較回路５の基準電圧として用い
られるようになっている。Next, the alarm generator will be described with reference to FIGS. 2, 7 is an operational level setting circuit constituted by a series circuit of a variable resistor R 0 and the resistor R 1 to R 7. Reference voltage generating circuit 3 is provided with an integration circuit comprising a comparator 31, resistor 32 and capacitor 33 and the diode D 1. The comparator 31 receives the terminal voltage of the variable resistor R 0 of the operation level setting circuit 7 as a reference voltage, and receives the signal voltage V 0 output from the signal voltage generation circuit 2, and integrates the output voltage. The terminal voltage V 1 of the capacitor 33 obtained as described above is used as a reference voltage of the comparison circuit 5.
【００１０】被比較電圧発生回路４は比較器４１〜４
６、抵抗４７及び４８、抵抗Ｒ11〜Ｒ16を備えたもので
ある。各比較器４１〜４６はそれぞれ動作レベル設定回
路７の抵抗Ｒ1〜Ｒ6の端子電圧が基準電圧として与えら
れ、また信号電圧発生回路２から出力される信号電圧Ｖ
0が与えられており、その出力側は各抵抗Ｒ11〜Ｒ16を
介して抵抗４７及び４８の接続点に接続され、この接続
点の電圧Ｖ2が比較回路５の被比較電圧として用いられ
るようになっている。警報手段６は比較回路５から出力
される警報信号Ｖ3によって作動し、例えばブザーなど
で警報音を発し、あるいは適宜の警報表示を行うように
構成されている。The compared voltage generating circuit 4 includes comparators 41 to 4
6, resistors 47 and 48, those having a resistance R 11 to R 16. Each of the comparators 41 to 46 receives the terminal voltages of the resistors R 1 to R 6 of the operation level setting circuit 7 as a reference voltage, and outputs the signal voltage V output from the signal voltage generation circuit 2.
0 is provided, and its output side is connected to a connection point between the resistors 47 and 48 via the respective resistors R 11 to R 16 , and the voltage V 2 at this connection point is used as a voltage to be compared by the comparison circuit 5. It has become. Alarm means 6 is configured to operate by the warning signal V 3 outputted from the comparison circuit 5, such as an alarm sound buzzer, or an appropriate alarm display performed.
【００１１】この実施例は上述のような構成であり、次
のように動作する。信号電圧発生回路２の信号電圧Ｖ0
は、そのレベルが比較器３１及び比較器４１〜４６でそ
れぞれの基準電圧と比較される。動作レベル設定回路７
の可変抵抗Ｒ0は基本となる警報点を設定するものであ
り、信号電圧Ｖ0のレベルが可変抵抗Ｒ0の端子電圧以上
になると比較器３１の出力が「Ｈ」となり、コンデンサ３
３が抵抗３２とで決まる時定数で充電され、その端子電
圧Ｖ1が図３に示すように次第に高くなる。This embodiment is configured as described above, and operates as follows. The signal voltage V 0 of the signal voltage generation circuit 2
Is compared with the respective reference voltages in the comparator 31 and the comparators 41 to 46. Operation level setting circuit 7
The variable resistor R 0 sets a basic alarm point. When the level of the signal voltage V 0 becomes higher than the terminal voltage of the variable resistor R 0 , the output of the comparator 31 becomes “H” and the capacitor 3
3 is charged with a time constant determined by the resistor 32, the terminal voltage V 1 is made as gradually increases shown in FIG.
【００１２】ここで、信号電圧Ｖ0のレベルが比較器４
１の基準電圧、すなわち抵抗Ｒ1の端子電圧より低い場
合には比較器４１〜４６の出力はいずれも「Ｈ」となり、
被比較電圧発生回路４の出力電圧Ｖ2は抵抗４７及び４
８で決まる高い電圧となる。図３のＶ20はこの電圧を示
したものである。従って、電圧Ｖ20に端子電圧Ｖ1が達
するまでには時間ｔ0を要し、比較回路５は比較器３１
の出力が「Ｈ」となってから時間ｔ0後に出力が「Ｈ」とな
り、警報信号Ｖ3が出力されて警報手段６が作動する。Here, the level of the signal voltage V0 is
When the reference voltage is lower than the reference voltage of R1, ie, the terminal voltage of the resistor R1, the outputs of the comparators 41 to 46 all become "H",
The output voltage V2 of the compared voltage generation circuit 4 is
8 is high. V20 in FIG. 3 indicates this voltage. Therefore, it takes time t0 for the terminal voltage V1 to reach the voltage V20, and the comparison circuit 5
The output becomes "H" after a time t0 from the output of "H" becomes "H", the alarm signal V3 is output, and the alarm means 6 operates.
【００１３】また信号電圧Ｖ0のレベルが抵抗Ｒ1の端子
電圧より高く、抵抗Ｒ2の端子電圧より低い場合には、
比較器４１の出力が「Ｌ」となって抵抗Ｒ11が抵抗４８と
並列に接続された形となる。このため、被比較電圧発生
回路４の出力電圧Ｖ2は図３に示すようにＶ20より少し
低いＶ21となる。従って、この電圧Ｖ21に端子電圧Ｖ1
が達するまでの時間はｔ0より少し短いｔ1となり、比較
回路５の出力は時間ｔ1後に「Ｈ」となり、警報信号Ｖ3が
出力されて警報手段６が作動する。When the level of the signal voltage V 0 is higher than the terminal voltage of the resistor R 1 and lower than the terminal voltage of the resistor R 2 ,
The output of the comparator 41 becomes “L”, and the resistor R 11 is connected in parallel with the resistor 48. Therefore, the output voltage V 2 of the comparator voltage generating circuit 4 becomes slightly lower V 21 from V 20, as shown in FIG. Therefore, the terminal voltage V 1 is added to this voltage V 21.
Little short t 1 becomes more time t 0 until reached "H" output after the time t 1 of the comparator circuit 5, alarm means 6 warning signal V 3 is output to operate.
【００１４】更に信号電圧Ｖ0のレベルが高くなると、
それに応じて比較器４２〜４６の出力が順次「Ｌ」とな
り、抵抗Ｒ12〜Ｒ16のうち抵抗４８と並列に接続される
ものが増加するので、被比較電圧発生回路４の出力電圧
はＶ22、Ｖ23……と順次低くなる。このため、警報信号
Ｖ3が出力される時間もｔ2、ｔ3……と順次短くなり、
それだけ早く警報信号Ｖ3が出力されるようになる。一
方、警報信号Ｖ3が出力される前に信号電圧Ｖ0のレベル
が可変抵抗Ｒ0の端子電圧以下になると、比較器３１の
出力が「Ｌ」となってコンデンサ３３の端子電圧Ｖ1はそ
れ以上上昇せず、ダイオードＤ1を通じて放電されて待
機状態に戻るために警報信号Ｖ3は出力されない。そし
て、警報信号Ｖ3が出力されるまでの時間は上述のよう
に信号電圧Ｖ0のレベルが高いほど短くなる。When the level of the signal voltage V 0 further increases,
Accordingly, the outputs of the comparators 42 to 46 sequentially become “L”, and the number of the resistors R 12 to R 16 connected in parallel with the resistor 48 increases, so that the output voltage of the compared voltage generation circuit 4 becomes V 22 , V 23 ... For this reason, the time during which the alarm signal V 3 is output also becomes shorter in order of t 2 , t 3 ,.
Sooner alarm signal V 3 is to be outputted. On the other hand, if the level of the signal voltage V 0 falls below the terminal voltage of the variable resistor R 0 before the alarm signal V 3 is output, the output of the comparator 31 becomes “L” and the terminal voltage V 1 of the capacitor 33 becomes not rise any more, an alarm signal V 3 to be discharged back to the standby state through the diode D 1 is not output. The time until the alarm signal V 3 is output becomes shorter the higher the level of the signal voltage V 0, as described above.
【００１５】従って、信号電圧Ｖ0が可変抵抗Ｒ0の端子
電圧を超える程度に応じて実質的な警報点が自動的に変
動し、信号電圧Ｖ0が基本となる警報点をわずかに超え
ただけで直ちに警報が発せられることはなく、しかも過
大入力に対してはその量に応じて早く警報が発せられる
のである。なお、実施例の回路構成は一例であり、他の
回路構成によって基準電圧発生回路３や被比較電圧発生
回路４を得ることが可能である。また回路の構成によっ
ては、この実施例とは電圧変化の方向を逆にして、基準
電圧を下降させ、被比較電圧を上昇させるようにするこ
ともできる。Therefore, the substantial alarm point automatically fluctuates according to the extent to which the signal voltage V 0 exceeds the terminal voltage of the variable resistor R 0 , and the signal voltage V 0 slightly exceeds the basic alarm point. The alarm is not issued immediately by itself, and an alarm is issued earlier according to the amount of excessive input. The circuit configuration of the embodiment is an example, and the reference voltage generation circuit 3 and the compared voltage generation circuit 4 can be obtained by another circuit configuration. Further, depending on the configuration of the circuit, the direction of the voltage change may be reversed from that in this embodiment so that the reference voltage is lowered and the voltage to be compared is raised.
【００１６】[0016]
【発明の効果】上述の実施例から明らかなように、この
発明は、信号電圧発生回路で取り出された高調波成分の
大きさに応じて実質的な設定値が自動的に変動するよう
にしたものであり、高調波成分が警報点をわずかに超え
ただけで直ちに警報が発せられることはなく、しかも高
調波成分が警報点を大きく超えるとその量に応じて早く
警報が発せられる。従って、基本となる警報点の設定が
容易となり、また高調波成分の大きさに応じて適切に警
報が発せられるので、実用性の優れた高調波成分警報装
置を得ることができ、電源波形等の高調波成分の監視と
適切な処置の実施が容易となるのである。As is apparent from the above-described embodiment, the present invention automatically changes the substantial set value according to the magnitude of the harmonic component extracted by the signal voltage generation circuit. That is, an alarm is not issued immediately when the harmonic component slightly exceeds the alarm point, and when the harmonic component greatly exceeds the alarm point, an alarm is issued early according to the amount. Therefore, it is easy to set a basic alarm point, and an appropriate alarm is issued in accordance with the magnitude of the harmonic component, so that a harmonic component alarm device with excellent practicality can be obtained, and a power supply waveform and the like can be obtained. This makes it easier to monitor the harmonic components and take appropriate measures.
【図１】この発明の一実施例の装置全体のブロック図で
ある。FIG. 1 is a block diagram of an entire apparatus according to an embodiment of the present invention.
【図２】同実施例の警報発生部の回路図である。FIG. 2 is a circuit diagram of an alarm generator of the embodiment.
【図３】同実施例の動作説明図である。FIG. 3 is an operation explanatory diagram of the embodiment.
２ 信号電圧発生回路 ３ 基準電圧発生回路 ４ 被比較電圧発生回路 ５ 比較回路 ６ 警報手段 ７ 動作レベル設定回路 ３１,４１〜４６ 比較器 ３２,４７,４８ 抵抗 ３３ コンデンサ Ｒ0 可変抵抗 Ｒ1〜Ｒ7,Ｒ11〜Ｒ16 抵抗 Ｖ0 信号電圧 Ｖ3 警報信号Reference Signs List 2 signal voltage generation circuit 3 reference voltage generation circuit 4 reference voltage generation circuit 5 comparison circuit 6 alarm means 7 operation level setting circuit 31, 41 to 46 comparator 32, 47, 48 resistor 33 capacitor R 0 variable resistor R 1 to R 7, R 11 ~R 16 resistance V 0 signal voltage V 3 warning signal
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭50−107977（ＪＰ，Ａ) 特開 昭60−255012（ＪＰ，Ａ) 実開 平３−104874（ＪＰ，Ｕ) 実開 昭64−46764（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H02H 3/50 - 3/52 G01R 23/20 G08B 21/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-50-107977 (JP, A) JP-A-60-255012 (JP, A) Fully open Hira 3-104874 (JP, U) Really open 1965 46764 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) H02H 3/50-3/52 G01R 23/20 G08B 21/00
Claims (1)
取り出し、波形整形して上記合成波に含まれる高調波成
分に対応した大きさの信号電圧Ｖ0を出力する信号電圧
発生回路と、信号電圧Ｖ0の大きさがあらかじめ設定さ
れた設定値を超えると経時的に上昇または下降する基準
電圧Ｖ1を出力する基準電圧発生回路と、信号電圧Ｖ0に
対応した大きさの被比較電圧Ｖ2を出力すると共に、信
号電圧Ｖ0が設定値を超えた場合には信号電圧Ｖ0と設定
値との差が大きいほど出力される上記被比較電圧Ｖ2を
下降または上昇させる被比較電圧発生回路と、上記基準
電圧Ｖ1と上記被比較電圧Ｖ2とを比較し、被比較電圧Ｖ
2と基準電圧Ｖ1のレベルが逆転すると警報信号Ｖ3を出
力する比較回路と、この比較回路の警報信号Ｖ3により
警報を発する警報手段、とを備えたことを特徴とする高
調波検出警報装置。A signal voltage generation circuit for extracting a harmonic component from a composite wave including a harmonic, shaping the waveform, and outputting a signal voltage V0 having a magnitude corresponding to the harmonic component included in the composite wave; When the magnitude of the signal voltage V0 exceeds a preset value, a reference voltage generating circuit that outputs a reference voltage V1 that rises or falls over time and a compared voltage V2 that has a magnitude corresponding to the signal voltage V0 are output. A reference voltage generating circuit for lowering or increasing the compared voltage V2 which is output as the difference between the signal voltage V0 and the set value is larger when the signal voltage V0 exceeds the set value; V1 is compared with the compared voltage V2.
A harmonic detection and alarm device comprising: a comparison circuit that outputs an alarm signal V3 when the level of the reference voltage V1 and the reference voltage V1 are reversed; and an alarm unit that issues an alarm based on the alarm signal V3 of the comparison circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3050831A JP3015484B2 (en) | 1990-02-26 | 1991-02-23 | Harmonic detection alarm |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4696990 | 1990-02-26 | ||
| JP2-46969 | 1990-02-26 | ||
| JP3050831A JP3015484B2 (en) | 1990-02-26 | 1991-02-23 | Harmonic detection alarm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04217811A JPH04217811A (en) | 1992-08-07 |
| JP3015484B2 true JP3015484B2 (en) | 2000-03-06 |
Family
ID=26387141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3050831A Expired - Lifetime JP3015484B2 (en) | 1990-02-26 | 1991-02-23 | Harmonic detection alarm |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3015484B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102831749A (en) * | 2012-09-13 | 2012-12-19 | 苏州新唯恒自动化科技有限公司 | Fault alarm device of magnetic sensor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL1820034T3 (en) * | 2004-11-18 | 2010-03-31 | Powersense As | Compensation of simple fiberoptic faraday effect sensors |
-
1991
- 1991-02-23 JP JP3050831A patent/JP3015484B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102831749A (en) * | 2012-09-13 | 2012-12-19 | 苏州新唯恒自动化科技有限公司 | Fault alarm device of magnetic sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04217811A (en) | 1992-08-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4742103B2 (en) | Insulation resistance detector | |
| CA1162988A (en) | Power measurement transducer | |
| KR920020216A (en) | How to measure electrical energy usage | |
| US20040252525A1 (en) | Method and apparatus for disconnecting an electrical generator from the electricity supply | |
| DE689289T1 (en) | High voltage control for transfection | |
| US4168124A (en) | Method and device for measuring the solar energy received at a particular place | |
| JP3015484B2 (en) | Harmonic detection alarm | |
| CN108474809A (en) | Monitoring device for monitoring surge arrester and for establishing and the method for the relevant monitoring data of surge arrester | |
| US5155752A (en) | Output monitoring circuit for a radiation generator apparatus | |
| JPH02500160A (en) | I2t monitoring circuit | |
| CN116047175A (en) | Capacitance monitoring method, electronic device and computer readable storage medium | |
| CN111025187B (en) | Ground fault early warning method, device and equipment and storage medium | |
| CN109283445B (en) | Insulation detection method and controller of energy storage type rail vehicle charging system | |
| US7365953B2 (en) | Apparatus and method for emulating a component in a circuit | |
| US6512380B2 (en) | Contactor and trip circuit therefor | |
| CN102053234A (en) | On-line monitoring device detector of arrester | |
| JP3122544B2 (en) | Method and apparatus for detecting direction of generation of harmonics | |
| KR100364866B1 (en) | A Diagnostic System for Condenser Bank in Electric Power System | |
| CN111077360B (en) | Target resistance live line measurement method and device and related components | |
| JP3245397B2 (en) | Partial discharge measurement method | |
| JP2000350351A (en) | Digital protective controller | |
| JP3909337B2 (en) | Single operation detector for distributed power supply | |
| JPH07170651A (en) | Electronic circuit breaker for wiring protection | |
| CN115173562A (en) | Intelligent monitoring and protecting method and system for electric power instrument | |
| JP3476261B2 (en) | Battery-powered electronic devices |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19991116 |