JP3407242B2 - Overvoltage protection relay - Google Patents
Overvoltage protection relayInfo
- Publication number
- JP3407242B2 JP3407242B2 JP21335496A JP21335496A JP3407242B2 JP 3407242 B2 JP3407242 B2 JP 3407242B2 JP 21335496 A JP21335496 A JP 21335496A JP 21335496 A JP21335496 A JP 21335496A JP 3407242 B2 JP3407242 B2 JP 3407242B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- voltage
- protection relay
- set value
- overvoltage protection
- 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
- Measurement Of Current Or Voltage (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
【発明の属する技術分野】本発明は、同期機等の過電圧
保護に使用する過電圧保護継電器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overvoltage protection relay used for overvoltage protection of synchronous machines and the like.
【従来の技術】同期機等の過電圧保護は、電圧が設定値
を超過したことを検出する過電圧保護継電器と、電圧が
設定値を越えていなくても周波数が定格周波数より低く
なると過励磁となるので、その過励磁を検出する過励磁
保護継電器とが採用されてきた。過電圧保護継電器は図
３に示されるように、ＰＴ入力１より電圧検出回路２で
検出した電圧は設定値３と比較器４にて比較され、設定
値３を越えている場合には過電圧信号５を出力する。一
方、過励磁保護継電器は磁束密度が電圧に比例し周波数
に反比例することにより、電圧と周波数の比率を監視し
ている。過励磁保護継電器は図４に示されるように、Ｐ
Ｔ入力１より周波数検出回路６で検出した周波数を電圧
補正回路７に入力して、電圧検出回路２で検出した電圧
を見かけ上、周波数が定格周波数より高い場合は低く、
低い場合は高くなるように補正する。そして、電圧補正
回路７の出力は設定値３と比較器４にて比較され、設定
値３を越えている場合には過励磁信号８を出力する。図
５に従来の過励磁保護継電器の特性を示す。定格周波数
ｆ0 の時設定値１００％で動作し、周波数が定格周波数
より５％下がると設定値の９５％で動作し、５％上がる
と設定値の１０５％で動作することをあらわしている。
なお、周波数が定格値の場合、過励磁保護継電器は前述
の過電圧保護継電器と同じ機能となる。2. Description of the Related Art Overvoltage protection for a synchronous machine or the like is an overvoltage protection relay that detects when the voltage exceeds a set value, and is overexcited when the frequency becomes lower than the rated frequency even if the voltage does not exceed the set value. Therefore, an overexcitation protection relay that detects the overexcitation has been adopted. In the overvoltage protection relay, as shown in FIG. 3, the voltage detected by the voltage detection circuit 2 from the PT input 1 is compared with the set value 3 by the comparator 4, and when the voltage exceeds the set value 3, the overvoltage signal 5 Is output. On the other hand, the overexcitation protection relay monitors the ratio of voltage to frequency because the magnetic flux density is proportional to voltage and inversely proportional to frequency. The over-excitation protection relay, as shown in FIG.
The frequency detected by the frequency detection circuit 6 is input from the T input 1 to the voltage correction circuit 7, and the voltage detected by the voltage detection circuit 2 is apparently low when the frequency is higher than the rated frequency.
If it is low, correct it so that it becomes high. Then, the output of the voltage correction circuit 7 is compared with the set value 3 by the comparator 4, and when it exceeds the set value 3, the overexcitation signal 8 is output. Fig. 5 shows the characteristics of a conventional overexcitation protection relay. When the rated frequency is f 0 , it operates at a set value of 100%, when the frequency is 5% lower than the rated frequency, it operates at 95% of the set value, and when it rises 5%, it operates at 105% of the set value.
When the frequency is at the rated value, the overexcitation protection relay has the same function as the above-mentioned overvoltage protection relay.
【発明が解決しようとする課題】このような過励磁保護
継電器は、周波数が定格よりも高い場合、電圧が定格よ
り高くなっていても周波数で補正されてしまい電圧が高
くなっていることを検出することが出来ない場合があ
る。そのため従来の同期機の過電圧保護には過電圧保護
継電器と過励磁保護継電器の２種類が使用されてきた。
本発明の課題は、１台の過電圧保護継電器で過電圧と過
励磁を共に検出できるようにすることにある。When the frequency is higher than the rating, such an overexcitation protection relay detects that the voltage is corrected because the frequency is corrected even if the voltage is higher than the rating. You may not be able to do it. Therefore, two types of conventional overvoltage protection for synchronous machines, an overvoltage protection relay and an overexcitation protection relay, have been used.
An object of the present invention is to make it possible to detect both overvoltage and overexcitation with a single overvoltage protection relay.
【課題を解決するための手段】過電圧保護継電器は電圧
値が設定値を超過することと、電圧値が設定値より低く
ても周波数が定格よりも低い場合その低い量に応じて電
圧値を補正してその値が設定値を超過することを検出で
きればよい。したがって、過励磁保護継電器において電
圧を周波数で補正する回路で、補正回路を有効にする周
波数範囲を定格周波数未満にすればよい。[Means for Solving the Problems] An overvoltage protection relay corrects a voltage value according to a voltage value exceeding a set value, and if the frequency value is lower than a rated value even if the voltage value is lower than the set value. It is only necessary to detect that the value exceeds the set value. Therefore, in the circuit for correcting the voltage with the frequency in the overexcitation protection relay, the frequency range in which the correction circuit is valid may be set to be less than the rated frequency.
【発明の実施の形態】図１に本発明の実施例を示す。図
４に示す従来回路と相違する点は、周波数検出回路６の
出力側に上限リミッタ回路９を設置して、補正に使用す
る周波数が定格周波数を越えないようにした点である。
あるいは、電圧補正回路７の中で、定格周波数と比較し
たあとで定格周波数より高いときは補正しないようにす
ることによっても達成できる。本発明による過励磁保護
継電器の特性を図２に示す。周波数が定格周波数より高
くなっても動作値は設定値１００％でかわらない。つま
り、周波数が定格周波数より高くなっても電圧値のみで
動作する。このようにして、周波数の電圧値補正効果を
定格周波数未満に限定することによって、補正電圧値が
設定値３を越えている場合、過励磁を含んだ過電圧信号
１０を出力する。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention. The difference from the conventional circuit shown in FIG. 4 is that an upper limiter circuit 9 is provided on the output side of the frequency detection circuit 6 so that the frequency used for correction does not exceed the rated frequency.
Alternatively, the voltage correction circuit 7 can achieve this by not performing correction when the frequency is higher than the rated frequency after being compared with the rated frequency. The characteristics of the overexcitation protection relay according to the present invention are shown in FIG. Even if the frequency becomes higher than the rated frequency, the operating value does not change at the set value of 100%. That is, even if the frequency becomes higher than the rated frequency, only the voltage value operates. In this way, by limiting the voltage value correction effect of the frequency to less than the rated frequency, when the correction voltage value exceeds the set value 3, the overvoltage signal 10 including overexcitation is output.
【発明の効果】本発明によれば、１台の過電圧保護継電
器で過電圧と過励磁を共に検出でき、経済効果を得るこ
とができる。According to the present invention, one overvoltage protection relay can detect both overvoltage and overexcitation, and an economic effect can be obtained.
【図１】この発明の実施例を示す構成図FIG. 1 is a configuration diagram showing an embodiment of the present invention.
【図２】本発明の特性を示す図FIG. 2 is a diagram showing characteristics of the present invention.
【図３】従来の過電圧保護継電器の例を示す構成図FIG. 3 is a configuration diagram showing an example of a conventional overvoltage protection relay.
【図４】従来の過励磁保護継電器の例を示す構成図FIG. 4 is a configuration diagram showing an example of a conventional overexcitation protection relay.
【図５】従来の特性を示す図FIG. 5 is a diagram showing conventional characteristics.
１…ＰＴ入力、２…電圧検出回路、３…設定値、４…比
較器、５…過電圧信号、６…周波数検出回路、７…電圧
補正回路、８…過励磁信号、９…上限リミッタ回路、１
０…過励磁を含んだ過電圧信号。1 ... PT input, 2 ... voltage detection circuit, 3 ... setting value, 4 ... comparator, 5 ... overvoltage signal, 6 ... frequency detection circuit, 7 ... voltage correction circuit, 8 ... overexcitation signal, 9 ... upper limiter circuit, 1
0 ... Overvoltage signal including overexcitation.
Claims (2)
する過電圧保護継電器において、入力電圧を検出する電
圧検出手段と、入力周波数を検出する周波数検出手段
と、前記電圧検出手段にて検出された入力電圧を入力と
し、前記周波数検出手段にて検出された周波数が定格周
波数未満の場合のみ、その周波数と定格周波数の偏差に
応じて入力電圧値を補正する電圧補正手段と、この電圧
補正手段の出力を設定値と比較し、設定値を超える場合
に過電圧信号を出力する比較手段とからなることを特徴
とする過電圧保護継電器1. An overvoltage protection relay for detecting that an input voltage value exceeds a set value, a voltage detecting means for detecting an input voltage, a frequency detecting means for detecting an input frequency, and a voltage detecting means for detecting the input voltage. And a voltage correction means for correcting the input voltage value according to the deviation between the frequency and the rated frequency only when the frequency detected by the frequency detection means is less than the rated frequency. Means for comparing the output of the means with a set value and outputting an overvoltage signal when the value exceeds the set value.
て、電圧補正手段は、定格周波数以上の前記周波数検出
手段の出力を制限する上限リミッタ回路を有しているこ
とを特徴とする過電圧保護継電器2. The overvoltage protection relay according to claim 1, wherein the voltage correction means has an upper limiter circuit for limiting the output of the frequency detection means at a rated frequency or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21335496A JP3407242B2 (en) | 1996-08-13 | 1996-08-13 | Overvoltage protection relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21335496A JP3407242B2 (en) | 1996-08-13 | 1996-08-13 | Overvoltage protection relay |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1062458A JPH1062458A (en) | 1998-03-06 |
| JP3407242B2 true JP3407242B2 (en) | 2003-05-19 |
Family
ID=16637787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21335496A Expired - Lifetime JP3407242B2 (en) | 1996-08-13 | 1996-08-13 | Overvoltage protection relay |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3407242B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5272678B2 (en) * | 2008-11-20 | 2013-08-28 | 三菱電機株式会社 | Overexcitation detection device |
| JP2017198467A (en) * | 2016-04-25 | 2017-11-02 | キヤノン株式会社 | Detection circuit, power supply device, and image formation device |
| KR102580637B1 (en) | 2016-08-11 | 2023-09-19 | 엘지이노텍 주식회사 | Apparatus for detecting circuit failure and electronic vehicle charging controller including thereof |
| JP7062355B2 (en) * | 2016-11-28 | 2022-05-06 | キヤノン株式会社 | Voltage detection device, power detection device and image forming device |
-
1996
- 1996-08-13 JP JP21335496A patent/JP3407242B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1062458A (en) | 1998-03-06 |
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