JPH06315226A - Overexcitation relay - Google Patents

Overexcitation relay

Info

Publication number
JPH06315226A
JPH06315226A JP12525593A JP12525593A JPH06315226A JP H06315226 A JPH06315226 A JP H06315226A JP 12525593 A JP12525593 A JP 12525593A JP 12525593 A JP12525593 A JP 12525593A JP H06315226 A JPH06315226 A JP H06315226A
Authority
JP
Japan
Prior art keywords
frequency
voltage
relay
overexcitation
generator
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
Application number
JP12525593A
Other languages
Japanese (ja)
Inventor
Kenji Ueda
健二 上田
Soichi Hamamoto
総一 濱本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP12525593A priority Critical patent/JPH06315226A/en
Publication of JPH06315226A publication Critical patent/JPH06315226A/en
Pending legal-status Critical Current

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  • Protection Of Transformers (AREA)
  • Protection Of Generators And Motors (AREA)

Abstract

PURPOSE:To allow accurate function of overexcitation relay for any values of voltage and frequency without requiring the rated voltage and rated frequency as the operation guarantee condition of the overexcitation relay. CONSTITUTION:The overexcitation relay comprises a voltage converter 13 for measuring the output voltage V from a generator 1, an r.p.m. measuring unit 14 for the generator 1, a unit conversion circuit 15 for converting the r.p.m. thus measured into a frequency F, a circuit 16 for calculating V/F value, and a detection protective circuit 12a. Since the voltage V and the frequency F of the generator 1 can be determined independently, the overexcitation relay can be operated positively even if the voltage V and the frequency F have not the rated values.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、発電機や変圧器など
の過励磁状態を検出して保護する過励磁継電器に関する
ものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overexcitation relay for detecting and protecting an overexcitation state of a generator or a transformer.

【0002】[0002]

【従来の技術】一般に、発電機,変圧器などの検出対象
機器の過励磁状態を検出して保護する過励磁継電器にお
いて、励磁状態は、電圧Vと周波数Fの比(V/F値)
を判定することにより測定される。図4は従来の過励磁
継電器を発電機に取り付けた状態を示す単線結線図であ
り、図4において、1は発電機、2は発電機電圧を測定
し易い電圧に降圧する計器用変圧器、3は過励磁継電器
である。
2. Description of the Related Art Generally, in an overexcitation relay for detecting and protecting an overexcitation state of a detection target device such as a generator or a transformer, the excitation state is a ratio of a voltage V to a frequency F (V / F value).
It is measured by determining. FIG. 4 is a single wire connection diagram showing a state in which a conventional overexcitation relay is attached to a generator. In FIG. 4, 1 is a generator, 2 is a transformer for an instrument that steps down the generator voltage to a voltage that is easy to measure, 3 is an overexcitation relay.

【0003】次に動作について説明する。図5は従来の
継電器の動作を示した動作原理図であり、図5におい
て、4は電圧用トランス、5はリアクタ(L)、6は電
圧変換用抵抗、7は電圧変換用抵抗6で得られる電圧V
Rを整流し平滑する整流平滑回路、8はその電圧VRを導
入してV/F値が所定の値に達したとき動作できるよう
にする判定回路、9は判定回路8の出力に時限Tを付加
する時限回路、10は接点信号を出すための駆動回路、
11はその接点信号により励磁され、しゃ断器等を動作
させるための電磁コイル、12は上記整流平滑回路7〜
電磁コイル11から成る検出保護回路、Vは検出対象機
器(発電機や変圧器)にかかる電圧Vである。
Next, the operation will be described. FIG. 5 is an operation principle diagram showing the operation of a conventional relay. In FIG. 5, 4 is a voltage transformer, 5 is a reactor (L), 6 is a voltage conversion resistor, and 7 is a voltage conversion resistor 6. Voltage V
A rectifying / smoothing circuit for rectifying and smoothing R , a determination circuit 8 for introducing the voltage V R to enable operation when the V / F value reaches a predetermined value, and a reference numeral 9 indicates a time T for the output of the determination circuit 8. And a driving circuit for outputting a contact signal,
Reference numeral 11 is an electromagnetic coil that is excited by the contact signal to operate a breaker or the like, and 12 is the rectifying / smoothing circuit 7 to
A detection protection circuit including the electromagnetic coil 11, V is a voltage V applied to a detection target device (a generator or a transformer).

【0004】以上のような回路において、測定電圧Vを
リアクタ5を介し電圧変換用抵抗6により変換して得ら
れる電圧VRを、上記の回路に送ることによって過励磁
継電器を動作させる。この原理によって励磁状態(V/
Hz)を示すV/F値が得られる論理は以下の通りであ
る。
In the circuit as described above, the overexcitation relay is operated by sending the voltage V R obtained by converting the measured voltage V through the reactor 5 by the voltage converting resistor 6 to the above circuit. Excitation state (V /
The logic for obtaining the V / F value indicating (Hz) is as follows.

【0005】リアクタ5に流れる電流は、 IL=(V/k)/(R+jωL) ここでkは電圧用トランス4により決まる比例定数であ
る。電圧変換用抵抗6の抵抗値をRとしωL>>Rと選
べば、 IL=(V/k)/jωL =(V/k)/j2πFL =(1/j2πkL)V/F =K1(V/F) ここで、ωは測定する電圧Vの持つ角周波数、F=ω/
2π、K1=1/j2πkLである。電圧変換用抵抗6
の両端の電圧VRは、 VR=R・IL =RK1(V/F) =K(V/F) となり、V/Fの値に比例したVRが得られることにな
る。ここで、K=RK1=R/j2πkLである。
The current flowing through the reactor 5 is I L = (V / k) / (R + jωL) where k is a proportional constant determined by the voltage transformer 4. If the resistance value of the voltage conversion resistor 6 is R and ωL >> R is selected, I L = (V / k) / jωL = (V / k) / j2πFL = (1 / j2πkL) V / F = K 1 ( V / F) where ω is the angular frequency of the voltage V to be measured, and F = ω /
2π, K 1 = 1 / j2πkL. Voltage conversion resistor 6
The voltage V R across both ends of V R is: V R = R · I L = RK 1 (V / F) = K (V / F), and V R proportional to the value of V / F is obtained. Here, K = RK 1 = R / j2πkL.

【0006】[0006]

【発明が解決しようとする課題】従来の過励磁継電器
は、前述の通りωL>>Rの時に精度よくV/F比が得
られ、ωLが小さい時,つまり周波数Fが低い時は精度
が悪くなる傾向があった。近年、揚水発電所,高炉ブロ
ワ,ガスタービンプラント等で発電機を低周波起動する
ケースが増加してきたため、従来の過励磁継電器では図
6のように低周波数域(定格周波数40%以下)でのF
−V特性が不明確であり、低電圧,低周波数におけるV
/F値検出に問題があった。
As described above, the conventional over-excitation relay can accurately obtain the V / F ratio when ωL >> R, and when ωL is small, that is, when the frequency F is low, the precision is poor. Tended to be. In recent years, as the number of cases of starting generators at low frequencies in pumped storage power plants, blast furnace blowers, gas turbine plants, etc. has increased, conventional over-excitation relays are used in the low frequency range (rated frequency 40% or less) as shown in Fig. 6. F
-V characteristics are unclear, V at low voltage and low frequency
There was a problem in the / F value detection.

【0007】この発明は上記のような課題を解決するた
めになされたものであり、動作の保証条件として定格値
を要求する必要をなくし、電圧および周波数がどの値を
とっても正確に動作する過励磁継電器を得ることを目的
とする。
The present invention has been made in order to solve the above problems and eliminates the need for requesting a rated value as a guaranteed condition for operation, and it is an overexcitation that operates correctly regardless of voltage and frequency. The purpose is to get a relay.

【0008】[0008]

【課題を解決するための手段】請求項1の発明に係る過
励磁継電器は、発電機や変圧器などの検出対象機器の電
圧を測定する電圧測定手段と、その周波数を測定する周
波数測定手段と、上記各測定手段で測定された電圧と周
波数の比(V/F値)を算出する電圧周波数比算出手段
を設けたものである。
An overexcitation relay according to the invention of claim 1 comprises a voltage measuring means for measuring the voltage of a device to be detected such as a generator or a transformer, and a frequency measuring means for measuring the frequency thereof. A voltage frequency ratio calculating means for calculating the voltage-frequency ratio (V / F value) measured by each of the measuring means is provided.

【0009】一方、請求項2の発明に係る過励磁継電器
は、リアクタとして異なる値に切替え可能なものを備え
るとともに、検出対象機器の周波数を測定する周波数測
定手段と、測定された周波数に応じて上記リアクタを切
替える切替手段と、この切替えに応じて励磁状態の判定
に係わる設定値を変換する設定値変換手段を設けたもの
である。
On the other hand, the over-excitation relay according to the invention of claim 2 is provided with a reactor capable of switching to different values, and has a frequency measuring means for measuring the frequency of the equipment to be detected, and the frequency depending on the measured frequency. A switching means for switching the reactor and a set value converting means for converting a set value relating to the determination of the excitation state according to the switching are provided.

【0010】また、請求項3に係る過励磁継電器は、上
記のものにおいて、発電機を検出対象機器とし、周波数
測定手段を、上記発電機の回転数を測定する回転数測定
装置と、測定された回転数を周波数に変換する単位変換
回路とから構成したものである。
The overexcitation relay according to a third aspect of the present invention is, in the above, a generator as a detection target device, a frequency measuring means, and a rotation speed measuring device for measuring the rotation speed of the generator. And a unit conversion circuit for converting the rotation speed into a frequency.

【0011】[0011]

【作用】請求項1の発明における過励磁継電器は、発電
機等の発生する電圧およびその周波数を独立に測定し
て、V/F値を算出し、所定のV/F値で動作するもの
である。
The overexcitation relay according to the invention of claim 1 independently measures the voltage generated by the generator and the frequency thereof, calculates the V / F value, and operates at a predetermined V / F value. is there.

【0012】一方、請求項2の発明における過励磁継電
器は、従来のものにおいて、リアクタの値を切替えられ
るようにするとともに、発電機等の発生周波数を測定し
て、この周波数の値に応じてリアクタの値を切替える。
On the other hand, the overexcitation relay according to the second aspect of the present invention is a conventional one, so that the value of the reactor can be switched, the frequency of generation of the generator or the like is measured, and the value is determined according to the value of this frequency. Switch the reactor value.

【0013】また、請求項3のものにおいては、測定値
が低い範囲においても精度よく動作するよう製作するこ
とが可能な回転数測定装置により、発電機の回転数(r
pm)を測定し、これを単位変換回路により周波数(H
z)に変換する。
Further, according to the third aspect of the invention, the rotation speed (r) of the generator is set by the rotation speed measuring device which can be manufactured so as to operate accurately even in the low measured value range.
pm) is measured, and the frequency (H
z).

【0014】[0014]

【実施例】【Example】

実施例1.以下、この発明の実施例1を図に基づいて説
明する。図1において、1は発電機、2は発電機電圧を
測定し易い電圧に降圧する計器用変圧器、8はV/F値
の判定回路、9は時限回路、10は駆動回路、11は電
磁コイルであり、以上は上記従来の技術と同一のものを
使用する。上記判定回路8〜電磁コイル11により検出
保護回路12aが構成されている。13は上記計器用変
圧器2の出力から発電機1の発生する電圧を測定する電
圧測定手段としての電圧変換器、14は発電機1の回転
数を測定する回転数測定装置、15は回転数測定装置1
4で得られる回転数を周波数に変換する単位変換回路、
16は発電機1の発生する電圧とその周波数の比を算出
する電圧周波数比算出手段としてのV/F値算出回路で
ある。なお、上記回転数測定装置14と単位変換回路1
5により周波数測定手段50が構成されている。また、
図5に示した従来例のリアクタ5,電圧変換用抵抗6及
び整流平滑回路7等は不要となる。
Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a generator, 2 is a voltage transformer for stepping down the generator voltage to a voltage that is easy to measure, 8 is a V / F value judgment circuit, 9 is a time circuit, 10 is a drive circuit, and 11 is an electromagnetic circuit. The coil is the same as the above-mentioned conventional technique. A detection protection circuit 12a is configured by the determination circuit 8 to the electromagnetic coil 11. 13 is a voltage converter as voltage measuring means for measuring the voltage generated by the generator 1 from the output of the voltage transformer 2; 14 is a rotation speed measuring device for measuring the rotation speed of the generator 1; and 15 is the rotation speed. Measuring device 1
Unit conversion circuit for converting the rotation speed obtained in 4 into frequency,
Reference numeral 16 is a V / F value calculation circuit as a voltage frequency ratio calculation means for calculating the ratio of the voltage generated by the generator 1 and its frequency. In addition, the rotation speed measuring device 14 and the unit conversion circuit 1
The frequency measuring means 50 is constituted by 5. Also,
The reactor 5, the voltage converting resistor 6 and the rectifying / smoothing circuit 7 of the conventional example shown in FIG. 5 are unnecessary.

【0015】次に動作について説明する。図1におい
て、発電機1の発生する電圧Vを計器用変圧器2を介し
て電圧変換器13で測定し、発電機1の回転数を回転数
測定装置14で測定する。さらに、回転数測定装置14
で得られる発電機1の回転数Nは単位変換回路15にお
いて周波数Fに変換される。変換の論理は以下の通りで
ある。 〔Hz〕=1/60・〔rpm〕 F=(1/60)・N 電圧変換器13と単位変換回路15により得られた電圧
Vと周波数FからV/F値をV/F値算出回路16によ
って算出し、判定回路8に導入する。上記回転数測定装
置14や電圧変換器13は測定値が低い範囲においても
精度よく動作するよう製作することが可能であるから、
低周波数(低電圧)域においても極めて正確なV/F値
が得られる。判定回路8ではV/F値が所定の値に達し
たとき動作できるようにし、時限回路9において判定回
路8の出力に時限Tを付加する。そして、駆動回路10
で接点信号を出し、電磁コイル11はその接点信号によ
り励磁され、しゃ断器等が制御される。なお、時限回路
9を設ける理由は次の通りである。V/F値が図6の動
作域にあると判定されたとき、時限を設けず、瞬時に継
電器を動作させることは、すなわち、検出対象機器自身
の正常状態への復帰能力を期待していないことになる。
しかし、実際には前記能力は備っており、時限を設ける
ことによって復帰可能か否かを判断するものである。
Next, the operation will be described. In FIG. 1, the voltage V generated by the generator 1 is measured by the voltage converter 13 via the transformer for instrument 2, and the rotation speed of the generator 1 is measured by the rotation speed measuring device 14. Furthermore, the rotation speed measuring device 14
The rotation speed N of the generator 1 obtained in step 1 is converted to the frequency F in the unit conversion circuit 15. The conversion logic is as follows. [Hz] = 1/60 · [rpm] F = (1/60) · N V / F value calculation circuit from the voltage V and the frequency F obtained by the voltage converter 13 and the unit conversion circuit 15 It is calculated by 16 and introduced into the judgment circuit 8. Since the rotation speed measuring device 14 and the voltage converter 13 can be manufactured so as to operate accurately even in a low measured value range,
An extremely accurate V / F value can be obtained even in a low frequency (low voltage) range. The decision circuit 8 is made operable when the V / F value reaches a predetermined value, and the time limit circuit 9 adds a time T to the output of the decision circuit 8. Then, the drive circuit 10
Outputs a contact signal, and the electromagnetic coil 11 is excited by the contact signal to control the breaker or the like. The reason for providing the time limit circuit 9 is as follows. When it is determined that the V / F value is in the operation range of FIG. 6, the relay is instantaneously operated without a time limit, that is, the ability of the detection target device itself to return to the normal state is not expected. It will be.
However, in reality, the above-mentioned ability is provided, and it is judged whether or not it is possible to recover by setting a time limit.

【0016】実施例2.上記実施例1では、電圧と回転
数(周波数)を独立に測定して検出要素を算出した。こ
こでは、図2に示すように、例えば図1に示した回転数
測定装置14と単位変換回路15とから構成した周波数
測定回路24によって周波数を測定し、判定回路21に
よってその周波数Fが図6に示した破線部分に近づいた
ことを判定する。その後、駆動回路22により電磁コイ
ル(Y)23を駆動させることによって、並列に接続さ
れたリアクタ17とリアクタ18のb接点19,a接点
20を動作させ、リアクタ(L1)17からリアクタ
(L2)18に切り替え、周波数Fの低い値(定格周波
数の40%以下)での過励磁継電器の精度向上を図る構
成としている。上記判定回路21,駆動回路22,電磁
コイル23及び接点19,20により切替手段51が構
成されている。
Example 2. In the above-mentioned Example 1, the voltage and the rotation speed (frequency) were measured independently to calculate the detection element. Here, as shown in FIG. 2, for example, the frequency is measured by the frequency measuring circuit 24 composed of the rotation speed measuring device 14 and the unit conversion circuit 15 shown in FIG. It is determined that the portion approaching the broken line shown in FIG. After that, by driving the electromagnetic coil (Y) 23 by the drive circuit 22, the b contact 19 and the a contact 20 of the reactor 17 and the reactor 18 connected in parallel are operated, and the reactor (L 1 ) 17 to the reactor (L 1 ) 2 ) Switch to 18 to improve the accuracy of the overexcitation relay at low values of frequency F (40% or less of the rated frequency). The determination circuit 21, the drive circuit 22, the electromagnetic coil 23 and the contacts 19 and 20 constitute a switching means 51.

【0017】従来の技術において、図5のリアクタ5に
流れる電流ILを求める際、ωL>>Rであることを条
件として用いた。しかし、ω=2πFであることから、
もし周波数Fが小さい値(定格周波数の40%以下)を
とる時、ωL>>Rという条件は成立しないため、IL
によって正確なV/F値が得られずに過励磁継電器の誤
差が大きくなると考えられる。
In the prior art, when obtaining the current I L flowing through the reactor 5 in FIG. 5, ωL >> R was used as a condition. However, since ω = 2πF,
If the frequency F takes a small value (40% or less of the rated frequency), the condition of ωL >> R does not hold, so I L
Therefore, it is considered that an accurate V / F value cannot be obtained and the error of the overexcitation relay increases.

【0018】この欠点を解消するために、この実施例2
では値の異なるリアクタを複数個取り付け、周波数Fに
応じてそれらを切り替え過励磁継電器の精度向上を図
る。定格周波数においてはb接点19が閉路しており、
a接点20は開路の状態としておく。このとき、ωL1
>>Rとなるようにリアクタ(L1)17の値を設定し
ておけば、上記従来の技術と同様にしてリアクタ電流I
Lが求められ、過励磁継電器が正常に動作する。一方、
もし周波数Fが図6の破線部分(定格周波数の40%以
下)に近づくと、判定回路21によってそれを検知し、
駆動回路22により電磁コイル(Y)23を励磁させ
る。この時、b接点19は開路、a接点20は閉路の状
態になり、リアクタとしてリアクタ(L2)18が用い
られる。さらに、周波数Fが定格周波数の40%以下で
あることを考慮して、リアクタ(L2)18がωL2>>
Rを満足するように設定しておけば、再びリアクタ電流
Lは上記従来の技術と同様にして求めることができ、
正確なV/F値が求められる。但し、リアクタ(L1
17からリアクタ(L2)18に切り替えることによっ
て生じるV/F値の変動(IL=(1/k)(V/jω
L))分を補正しなければならない。リアクタ電流IL
はリアクタ(L1)17からリアクタ(L2)18に切り
替わることで以下のように変動する。
In order to eliminate this drawback, this embodiment 2
Then, a plurality of reactors having different values are attached, and they are switched according to the frequency F to improve the accuracy of the overexcitation relay. At the rated frequency, the b contact 19 is closed,
The a-contact 20 is kept open. At this time, ωL 1
If the value of the reactor (L 1 ) 17 is set such that >> R, the reactor current I
L is required, and the overexcitation relay operates normally. on the other hand,
If the frequency F approaches the broken line portion of FIG. 6 (40% or less of the rated frequency), the decision circuit 21 detects it and
The drive circuit 22 excites the electromagnetic coil (Y) 23. At this time, the b-contact 19 is opened and the a-contact 20 is closed, and the reactor (L 2 ) 18 is used as the reactor. Further, considering that the frequency F is 40% or less of the rated frequency, the reactor (L 2 ) 18 has ωL 2 >>
If R is set so as to satisfy R, the reactor current I L can be obtained again in the same manner as the above-mentioned conventional technique.
An accurate V / F value is required. However, reactor (L 1 )
Fluctuation of V / F value caused by switching from 17 to reactor (L 2 ) 18 (I L = (1 / k) (V / jω
L)) minutes must be corrected. Reactor current I L
Changes from the reactor (L 1 ) 17 to the reactor (L 2 ) 18 as follows.

【0019】 IL1=(1/k)(V/jωL1) =(1/j2πkL1)V/F :ω=2πF =K2(V/F) :K2=1/j2πkL1L2=(1/k)(V/jωL2) =(1/k)(V/jωnL1) :n=L2/L1 =(1/k)(1/jωL1)(V/n) =(1/j2πkL1)(1/F)(V/n) =K2(1/n)(V/F) ゆえにIL1=nIL2 I L1 = (1 / k) (V / jωL 1 ) = (1 / j2πkL 1 ) V / F: ω = 2πF = K 2 (V / F): K 2 = 1 / j2πkL 1 I L2 = (1 / k) (V / jωL 2 ) = (1 / k) (V / jωnL 1 ): n = L 2 / L 1 = (1 / k) (1 / jωL 1 ) (V / n) = ( 1 / j2πkL 1 ) (1 / F) (V / n) = K 2 (1 / n) (V / F) Therefore I L1 = nI L2

【0020】従って、検出保護回路12bのV/F値判
定はリアクタ(L1)17を使用しているときに合わせ
て設定してあるので、リアクタ(L1)17からリアク
タ(L2)18へ切り替えた場合、IL2つまりVRが1/
n倍減る分,n倍だけの補正をしなければならない。そ
の補正を行うのが設定値変換回路25である。具体的に
は、図3に示すように、整流平滑回路7と判定回路8の
間に並列にb接点26とa接点27を設けるとともに、
a接点27と直列にn倍補正回路28を設け、上記b接
点26とa接点27を上記図2のb接点19及びa接点
20同様、駆動回路22により駆動される電磁コイル
(Y’)29によって切り替えるものである。上記n倍
補正回路28,電磁コイル29及び接点26,27によ
り設定値変換手段52が構成されている。
Therefore, the V / F value judgment of the detection protection circuit 12b is set in accordance with the use of the reactor (L 1 ) 17, so that the reactor (L 1 ) 17 to the reactor (L 2 ) 18 I L2, that is, V R is 1 /
Since it is reduced by n times, it is necessary to correct only n times. The set value conversion circuit 25 performs the correction. Specifically, as shown in FIG. 3, the b contact 26 and the a contact 27 are provided in parallel between the rectifying and smoothing circuit 7 and the determination circuit 8, and
An n-fold correction circuit 28 is provided in series with the a-contact 27, and the b-contact 26 and the a-contact 27 are electromagnetic coils (Y ') 29 driven by the drive circuit 22 like the b-contact 19 and the a-contact 20 of FIG. It is to switch by. The n-fold correction circuit 28, the electromagnetic coil 29, and the contacts 26, 27 constitute a set value conversion means 52.

【0021】以上のような構成によって、図6における
周波数Fの低い値での継電器動作のあいまいさを解消で
きる。なお、上記実施例2では、リアクタを複数個設け
て値を切り替えられるようにしたが、1個のリアクタで
値を可変にするようにしてもよい。
With the above configuration, the ambiguity of the relay operation at the low value of the frequency F in FIG. 6 can be eliminated. In the second embodiment, a plurality of reactors are provided so that the value can be switched, but the value may be variable in one reactor.

【0022】[0022]

【発明の効果】以上のように、請求項1の発明によれ
ば、過励磁状態の指標であるV/F値を求める場合、電
圧Vと周波数Fを独立に求め、それらよりV/F値を求
めるよう構成したので、低周波域においても精度の高い
ものが得られる効果がある。
As described above, according to the first aspect of the invention, when the V / F value which is the index of the overexcited state is obtained, the voltage V and the frequency F are independently obtained, and the V / F value is obtained from them. Since it is configured to obtain, there is an effect that a highly accurate one can be obtained even in a low frequency range.

【0023】また、請求項2の発明によれば、リアクタ
として異なる値に切り替え可能なものを用い、周波数F
の値に応じて切り替えて使用するように構成したので、
上記と同様に低周波域においても精度の高いものが得ら
れる効果がある。
Further, according to the invention of claim 2, a reactor which can be switched to different values is used, and the frequency F
I configured to switch and use according to the value of
Similar to the above, there is an effect that a highly accurate one can be obtained even in a low frequency range.

【0024】さらに、請求項3で、発電機の周波数測定
手段として用いられる回転数測定装置は、測定値が低い
範囲においても精度よく動作するよう製作することが可
能であるから、さらに精度の高いものが得られる効果が
ある。
Further, according to the third aspect of the invention, the rotation speed measuring device used as the frequency measuring means of the generator can be manufactured so as to operate accurately even in a low measured value range. There is an effect that can be obtained.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の実施例1を示すブロック図である。FIG. 1 is a block diagram showing a first embodiment of the present invention.

【図2】この発明の実施例2を示すブロック図である。FIG. 2 is a block diagram showing a second embodiment of the present invention.

【図3】実施例2の一部の具体的構成を示す図である。FIG. 3 is a diagram showing a specific configuration of part of the second embodiment.

【図4】従来の継電器を発電機に取り付けた状態を示し
た単線結線図である。
FIG. 4 is a single wire connection diagram showing a state in which a conventional relay is attached to a generator.

【図5】従来の継電器の動作原理図である。FIG. 5 is an operation principle diagram of a conventional relay.

【図6】従来の継電器のF−V特性図である。FIG. 6 is an FV characteristic diagram of a conventional relay.

【符号の説明】[Explanation of symbols]

1 発電機 3 過励磁継電器 5,17,18 リアクタ 7 整流平滑回路 8,21 判定回路 9 時限回路 10,22 駆動回路 13 電圧変換器 14 回転数測定装置 15 単位変換回路 16 V/F値算出回路(電圧周波数比算出手段) 24 周波数測定回路(周波数測定手段) 25 設定値変換回路 50 周波数測定手段 51 切替手段 52 設定値変換手段 1 Generator 3 Overexcitation relay 5,17,18 Reactor 7 Rectifying and smoothing circuit 8,21 Judgment circuit 9 Time limit circuit 10,22 Drive circuit 13 Voltage converter 14 Rotation speed measurement device 15 Unit conversion circuit 16 V / F value calculation circuit (Voltage / frequency ratio calculating means) 24 Frequency measuring circuit (frequency measuring means) 25 Setting value converting circuit 50 Frequency measuring means 51 Switching means 52 Setting value converting means

─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───

【手続補正書】[Procedure amendment]

【提出日】平成5年7月9日[Submission date] July 9, 1993

【手続補正1】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】図面の簡単な説明[Name of item to be corrected] Brief description of the drawing

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の実施例1を示すブロック図である。FIG. 1 is a block diagram showing a first embodiment of the present invention.

【図2】この発明の実施例2を示すブロック図である。FIG. 2 is a block diagram showing a second embodiment of the present invention.

【図3】実施例2の一部の具体的構成を示す図である。FIG. 3 is a diagram showing a specific configuration of part of the second embodiment.

【図4】従来の継電器を発電機に取り付けた状態を示し
た単線結線図である。
FIG. 4 is a single wire connection diagram showing a state in which a conventional relay is attached to a generator.

【図5】従来の継電器の動作原理図である。FIG. 5 is an operation principle diagram of a conventional relay.

【図6】従来の継電器のF−V特性図である。FIG. 6 is an FV characteristic diagram of a conventional relay.

【符号の説明】 1 発電機2,4 変圧器 3 過励磁継電器 5,17,18 リアクタ6 抵抗器 7 整流平滑回路 8,21 判定回路 9 時限回路 10,22 駆動回路11,23,29 電磁コイル 12,12b 検出保護回路 13 電圧変換器 14 回転数測定装置 15 単位変換回路 16 V/F値算出回路(電圧周波数比算出手段)19,20,26,27 接点 24 周波数測定回路(周波数測定手段) 25 設定値変換回路28 n倍補正回路 50 周波数測定手段 51 切替手段 52 設定値変換手段[Explanation of symbols] 1 generator 2, 4 transformer 3 overexcitation relay 5, 17, 18 reactor 6 resistor 7 rectifying and smoothing circuit 8, 21 determination circuit 9 time limit circuit 10, 22 drive circuit 11, 23, 29 electromagnetic coil 12, 12b Detection protection circuit 13 Voltage converter 14 Rotation speed measurement device 15 Unit conversion circuit 16 V / F value calculation circuit (voltage frequency ratio calculation means) 19, 20, 26, 27 Contact point 24 Frequency measurement circuit (frequency measurement means) 25 set value conversion circuit 28 n-fold correction circuit 50 frequency measurement means 51 switching means 52 set value conversion means

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 発電機,変圧器などの検出対象機器の過
励磁状態を検出して保護する過励磁継電器において、検
出対象機器の電圧を測定する電圧測定手段と、その周波
数を測定する周波数測定手段と、上記各測定手段で測定
された電圧と周波数の比を算出する電圧周波数比算出手
段と、算出された電圧周波数比に基づき過励磁状態を判
定する判定手段とを備えたことを特徴とする過励磁継電
器。
1. An overexcitation relay for detecting and protecting an overexcitation state of a detection target device such as a generator or a transformer, and a voltage measuring means for measuring the voltage of the detection target device and a frequency measurement for measuring the frequency thereof. Means, a voltage frequency ratio calculating means for calculating a voltage-frequency ratio measured by each of the measuring means, and a determining means for determining an overexcitation state based on the calculated voltage frequency ratio, Overexcitation relay.
【請求項2】 発電機,変圧器などの検出対象機器から
リアクタと電圧変換用抵抗を用いて得られる電圧に基づ
き、上記検出対象機器の電圧とその周波数の比で表わさ
れる励磁状態を判定することにより、過励磁状態を検出
して保護する過励磁継電器において、上記リアクタとし
て異なる値に切替え可能なものを備えるとともに、検出
対象機器の周波数を測定する周波数測定手段と、測定さ
れた周波数に応じて上記リアクタを切替える切替手段
と、この切替えに応じて上記判定に係わる設定値を変換
する設定値変換手段とを備えたことを特徴とする過励磁
継電器。
2. The excitation state represented by the ratio of the voltage of the detection target device and its frequency is determined based on the voltage obtained from the detection target device such as a generator or a transformer by using a reactor and a voltage conversion resistor. As a result, in the over-excitation relay that detects and protects the over-excitation state, the reactor is provided with one that can be switched to different values, and the frequency measurement means for measuring the frequency of the detection target device and the measured frequency An over-excitation relay, comprising: switching means for switching the reactor according to the switching, and setting value conversion means for converting a setting value related to the determination according to the switching.
【請求項3】 発電機を検出対象機器とし、周波数測定
手段を、上記発電機の回転数を測定する回転数測定装置
と、測定された回転数を周波数に変換する単位変換回路
とから構成したことを特徴とする請求項第1項又は第2
項記載の過励磁継電器。
3. A generator is a device to be detected, and the frequency measuring means is composed of a rotation speed measuring device for measuring the rotation speed of the generator and a unit conversion circuit for converting the measured rotation speed into a frequency. Claim 1 or 2 characterized by the above.
Over-excited relay described in paragraph.
JP12525593A 1993-04-28 1993-04-28 Overexcitation relay Pending JPH06315226A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12525593A JPH06315226A (en) 1993-04-28 1993-04-28 Overexcitation relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12525593A JPH06315226A (en) 1993-04-28 1993-04-28 Overexcitation relay

Publications (1)

Publication Number Publication Date
JPH06315226A true JPH06315226A (en) 1994-11-08

Family

ID=14905581

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12525593A Pending JPH06315226A (en) 1993-04-28 1993-04-28 Overexcitation relay

Country Status (1)

Country Link
JP (1) JPH06315226A (en)

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