JPH03160327A - Apparatus for measuring vibration - Google Patents

Apparatus for measuring vibration

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Publication number
JPH03160327A
JPH03160327A JP29976389A JP29976389A JPH03160327A JP H03160327 A JPH03160327 A JP H03160327A JP 29976389 A JP29976389 A JP 29976389A JP 29976389 A JP29976389 A JP 29976389A JP H03160327 A JPH03160327 A JP H03160327A
Authority
JP
Japan
Prior art keywords
vibration
output
disconnection
signal
transistor
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.)
Granted
Application number
JP29976389A
Other languages
Japanese (ja)
Other versions
JP2614335B2 (en
Inventor
Chiaki Okamura
千秋 岡村
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.)
Toshiba Corp
Original Assignee
Toshiba 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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP29976389A priority Critical patent/JP2614335B2/en
Publication of JPH03160327A publication Critical patent/JPH03160327A/en
Application granted granted Critical
Publication of JP2614335B2 publication Critical patent/JP2614335B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

PURPOSE:To prevent the generation of the turbine trip due to the erroneous detection at the return time of the disconnection of a vibration detector by connecting a vibration signal cut-off circuit to the output terminal of a disconnection detecting transistor. CONSTITUTION:When the coil 1A of a vibration detector 1 is disconnected, a disconnection detecting transistor (Tr) 7 is turned OFF and a high level signal is outputted to the P2 point of an output terminal to turn a cutting-off transistor (Tr) 8 ON and a vibration signal falls to a ground level to be not outputted to a P3 point. When disconnection is returned, the Tr 7 becomes an ON-state to output a disconnection return signal and a comparator 12 outputs a trigger pulse and an one-shot circuit 13 outputs a high level signal to operate a FET 14. The level of the P3 point falls to a ground level by the operation of the FET 14 and no vibration signal is outputted. By this constitution, the output of the vibration signal is delayed until an output sudden change due to the AC change component discharged from a condenser 9 at the return time of disconnection is converged and the generation of the trip caused by the output sudden change is prevented.

Description

【発明の詳細な説明】[Detailed description of the invention]

[発明の目的] (産業上の利用分野) 本発明は、振動測定装置に係わり、特にタービン発電機
等の振動を測定する装置の改良に関する。 (従来の技術) よく知られているように、タービン発電機はタービンを
高速で回転させ、タービンに接続された発電機を回転さ
せることにより発電を行っている。 タービンを高速回転(定格回転)まで上昇させるには、
先ず、タービンロータを低速回転させ、ならし運転をし
てロータの一時的な曲り(偏心量)を小さくする、いわ
ゆるターニングを行ってから徐々に回転を上昇させる。 また、タービンの回転数を定格回転数まで上げるには、
タービンに取付けられた振動検出器により、その振動を
監視しながら徐々に昇速する。 そして、振動監視には振動の大きさに対して警報点を設
け、一定以上の振動が発生しないように監視してタービ
ン発電機の安全な運転を実施している。 ところが、タービンに取付けられた前記振動検出器は、
常に微振動等、過酷な条件下で使用されているので、そ
の内部コイルが断線して振動検出が不能になることがあ
る。このため、振動測定装置には断線検出回路を設ける
のが一般的である。 第4図は、従来の振動測定装置の構成を示している。 振動検出器1は、タービンの所定か所に取付けられたビ
ックアップ式の振動センサであり、夕一ビンの回転速度
に比例した振動検出信号は振動サーキットボード2に入
力されている。 振動サーキットボード2に入力された振動検出信号は積
分器3により変位に比例した信号に変換され、ハイバス
フィルタ(HPF)4及び整流器5を介して振動信号と
して出力される。 一方、この従来例には、振動検出器1の断線検出をする
断線検出回路6が設けられている。 この断線検出回路6は、断線検出用トランジスタ7と、
断線検出がされたときに前記振動信号の出力をしゃ断す
る出力しゃ断用トランジスタ8から構成されている。 また、断線検出器1のコイル1Aには直列に抵抗器IB
が接続されており、この断線検出器1には、−v+[v
lの直流電圧が印加されている。 今、断線していない状態では、Pl点の直流電圧はーv
1に保持されており、−Vccより高い電圧となってい
るのでトランジスタ7はオン状態となり、その出力はー
Vccとなり(第5図(A)参照)、トランジスタ8は
動作しない。 ところが、振動検出器1のコイル1Aが断線すると、ト
ランジスタ7がオフとなり、P2点に“H”レベルの信
号が出力され、この信号によりトランジスタ8がオンと
なる。 このトランジスタ8の作動により、振動信号はグランド
レベルに落ち、P3点には振動信号が出力されない(第
5図(C))。 なお、振動検出器1に生じた直流電圧は、振動サーキッ
トボード2内のカップリングコンデンサってカットされ
るので、振動測定には影響はない。 (発明が解決しようとする課題) しかしながら、上記従来装置によれば、振動検出器1が
断線して復帰すると、振動検出器1に生じた前記直流電
圧が交流的な変化をしてカップリングコンデンサ9を通
じて出力が大きく変化する。 さらに、断線が復帰した後、振動サーキットボード2の
入力に変化がない場合には、カップリングコンデンサ9
に充電された電圧が放電する。この放電電圧は交流的な
変化分であり、振動信号が突変(第5図(C)参照)し
、警報点を越えた場合には、タービンをトリップさせる
といった問題点があった。 本発明は上記問題点に鑑みてなされたものであり、その
目的は、断線復帰時においても誤検出によるタービント
リップ等の発生を防止することのできる振動測定装置を
提供することにある。
[Object of the Invention] (Industrial Application Field) The present invention relates to a vibration measuring device, and particularly relates to an improvement of a device for measuring vibrations of a turbine generator or the like. (Prior Art) As is well known, a turbine generator generates electricity by rotating a turbine at high speed and rotating a generator connected to the turbine. To increase the turbine to high speed rotation (rated rotation),
First, the turbine rotor is rotated at a low speed, and after a break-in operation is performed to reduce temporary bending (eccentricity) of the rotor, so-called turning is performed, and then the rotation is gradually increased. In addition, to increase the rotation speed of the turbine to the rated speed,
A vibration detector attached to the turbine monitors the vibrations while gradually increasing the speed. For vibration monitoring, alarm points are set for the magnitude of vibration, and the turbine generator is operated safely by monitoring to prevent vibrations exceeding a certain level from occurring. However, the vibration detector attached to the turbine
Since they are used under harsh conditions such as constant slight vibrations, the internal coil may break and vibration detection becomes impossible. For this reason, a vibration measuring device is generally provided with a disconnection detection circuit. FIG. 4 shows the configuration of a conventional vibration measuring device. The vibration detector 1 is a big-up type vibration sensor attached to a predetermined location of the turbine, and a vibration detection signal proportional to the rotational speed of the filter is input to the vibration circuit board 2. A vibration detection signal input to the vibration circuit board 2 is converted by an integrator 3 into a signal proportional to displacement, and outputted as a vibration signal via a high-pass filter (HPF) 4 and a rectifier 5. On the other hand, this conventional example is provided with a disconnection detection circuit 6 for detecting disconnection of the vibration detector 1. This disconnection detection circuit 6 includes a disconnection detection transistor 7,
It is comprised of an output cutoff transistor 8 that cuts off the output of the vibration signal when a disconnection is detected. In addition, a resistor IB is connected in series to the coil 1A of the disconnection detector 1.
is connected to this disconnection detector 1, −v+[v
A DC voltage of 1 is applied. Now, in the state where there is no disconnection, the DC voltage at the Pl point is -v
Since the voltage is held at 1 and the voltage is higher than -Vcc, transistor 7 is turned on, its output becomes -Vcc (see FIG. 5(A)), and transistor 8 does not operate. However, when the coil 1A of the vibration detector 1 is disconnected, the transistor 7 is turned off and an "H" level signal is output to point P2, which turns on the transistor 8. Due to the operation of this transistor 8, the vibration signal falls to the ground level, and no vibration signal is output to point P3 (FIG. 5(C)). Note that since the DC voltage generated in the vibration detector 1 is cut off by the coupling capacitor in the vibration circuit board 2, it does not affect the vibration measurement. (Problem to be Solved by the Invention) However, according to the above conventional device, when the vibration detector 1 is disconnected and restored, the DC voltage generated in the vibration detector 1 changes like an AC, and the coupling capacitor 9, the output changes greatly. Furthermore, if there is no change in the input of the vibration circuit board 2 after the disconnection is restored, the coupling capacitor 9
The charged voltage is discharged. This discharge voltage is an alternating current variation, and if the vibration signal changes suddenly (see FIG. 5(C)) and exceeds a warning point, there is a problem that the turbine may be tripped. The present invention has been made in view of the above problems, and an object of the present invention is to provide a vibration measuring device that can prevent turbine trips and the like due to erroneous detection even when disconnection is restored.

【発明の構成】[Structure of the invention]

(課題を解決するための手段) 上記目的を達或するために本発明に係る振動測定装置は
、回転機減の回転軸等の振動量を検出する振動検出器と
、 この振動検出器の交流出力を積分して振動量相当の振動
信号を生成する積分器を有する振動検出部と、 前記振動検出器に抵抗器を介して直流バイアス電圧を印
加し、振動検出器の断線時には前記抵抗器に生ずる電圧
降下を検出して断線発生信号を出力する断線検出部と、 前記振動検出器の断線復帰時に前記積分器から出力され
る出力突変が収束するまで前記振動信号の出力をしゃ断
する振動信号しゃ断部と、を具備して成ることを特徴と
する。 (作用) 上記構成によれば、断線復帰時に生ずる出力突変が収束
するまでの間、振動信号の出力が強制的にしゃ断される
。 このため、上記出力突変が振動信号として出力されない
ので、誤検出によるタービントリップ等の発生が未然に
防止される。 (実施例) 第1図は本発明に係る振動測定装置の一実施例構成を示
している。なお、第4図に示した前記従来例と同一構成
部分には同一符号を付してその説明は省略する。 同図に示すように、本実施例は、断線検出用トランジス
タ7の出力端(P2点)に振動信号しゃ断回路11を接
続したものである。 この振動信号しゃ断回路11は、トランジスタ7から所
定レベル以上の断線復帰信号が出力されたときに、トリ
ガバルスを出力するコンバレータ12と、このコンバレ
ータ12からのトリガバルスを人力して予め設定された
時間tが経過するまで“H″レベル信号を出力するワン
ショット回路13と、このワンシラット回路13の“H
″レベル信号により、オン状態となるFET14とを備
えている。 次に本実施例の作用を第2図のタイムチャートを参照し
つつ説明する。 前述したように振動検出器1のコイルIAが断線してい
ない状態では、Pl点の直流電圧は−■に保持されてお
り、−Vccより高い電圧となっているのでトランジス
タ7はオン状態となり、その出力は−Vccとなり(第
2図(A)参照)、トランジスタ8は動作しない。 コイルIAが断線すると、トランジスタ7がオフとなり
、P2点に“H”レベルの信号が出力され、この信号に
よりトランジスタ8がオンとなる(第2図(B))。 このトランジスタ8の作動により、振動信号はグランド
レベルに落ち、P3点には振動信号が出力されない(第
2図(D))。 断線が復帰すると、P1点の電位も元に復帰するので、
第2図(A)に示すようにトランジスタ7は再びオン状
態となり、このトランジスタ7からは断線復帰信号が出
力される(第5図(B))。 この断線復帰信号がコンバレータ12に供給されるとコ
ンバレータ12からは直ちにトリガバルスが出力され、
ワンショット回路13を作動させる。 ワンショット回路13は、予め定められた時間t (−
CR)の間“H゜レベル信号を出力してFET14を作
動させる(第5図(C))。 このFET14の作動により、P3点のレベルはグラン
ドに落ち、振動信号の出力はされない。 なお、これと同時に、しゃ断用トランジスタ8もオフ状
態に復帰するがこの復帰動作よりもFET14がオン状
態となる時間の方が早いので、振動復帰信号出力からt
時間経過するまでは振動信号の出力はない(第5図(D
))。 このため、断線復帰時にコンデンサ9から放電される交
流変化分による出力突変が収束するまで振動信号の出力
が遅延され、出力突変に起因するタービントリップの発
生等を未然に防止できる。 なお、本実施例では、振動サーキットボード2に、振動
信号しゃ断回路11を組み込んだ構成としたが、第3図
に示すように振動信号しゃ断回路11のみを別体に構成
して、従来装置に信号線1[発明の奪#] 以上説明したように本発明に係る振動測定装置によれば
、振動検出器の断線復帰時による突変が収束するまで振
動信号出力をしゃ断しているので、出力突変に起因する
タービントリップ等の誤動作発生を未然に防止でき、装
置の信頼性が向上する。
(Means for Solving the Problems) In order to achieve the above object, a vibration measuring device according to the present invention includes a vibration detector that detects the amount of vibration of a rotating shaft of a rotating machine, and an alternating current of this vibration detector. a vibration detection section having an integrator that integrates the output to generate a vibration signal equivalent to the amount of vibration; and a DC bias voltage is applied to the vibration detector via a resistor, and when the vibration detector is disconnected, the voltage is applied to the resistor. a disconnection detection unit that detects a voltage drop that occurs and outputs a disconnection occurrence signal; and a vibration signal that cuts off the output of the vibration signal until the sudden output change output from the integrator is converged when the vibration detector recovers from the disconnection. It is characterized by comprising a blocking part. (Function) According to the above configuration, the output of the vibration signal is forcibly cut off until the sudden change in output that occurs when the disconnection is restored is resolved. Therefore, since the sudden change in output is not output as a vibration signal, occurrence of turbine trip or the like due to erroneous detection is prevented. (Embodiment) FIG. 1 shows the configuration of an embodiment of a vibration measuring device according to the present invention. Components that are the same as those of the conventional example shown in FIG. 4 are designated by the same reference numerals, and their explanations will be omitted. As shown in the figure, in this embodiment, a vibration signal cutoff circuit 11 is connected to the output terminal (point P2) of the disconnection detection transistor 7. This vibration signal cutoff circuit 11 includes a converter 12 that outputs a trigger pulse when a disconnection recovery signal of a predetermined level or higher is output from the transistor 7, and a trigger pulse from the converter 12 that is manually input for a preset time t. A one-shot circuit 13 that outputs an “H” level signal until the “H” level signal of this one-shot circuit 13
"FET 14 which is turned on by a level signal. Next, the operation of this embodiment will be explained with reference to the time chart of FIG. 2. As mentioned above, the coil IA of the vibration detector 1 is disconnected. When the DC voltage is not turned on, the DC voltage at the Pl point is held at -■, which is higher than -Vcc, so the transistor 7 is turned on and its output becomes -Vcc (Figure 2 (A)). ), transistor 8 does not operate. When coil IA is disconnected, transistor 7 is turned off, and an "H" level signal is output to point P2, which turns on transistor 8 (see Figure 2 (B)). ). Due to the operation of this transistor 8, the vibration signal falls to the ground level, and no vibration signal is output to the P3 point (Fig. 2 (D)). When the disconnection is restored, the potential at the P1 point also returns to its original level. ,
As shown in FIG. 2(A), the transistor 7 is turned on again, and a disconnection recovery signal is output from the transistor 7 (FIG. 5(B)). When this disconnection recovery signal is supplied to the converter 12, the trigger pulse is immediately output from the converter 12,
Activate the one-shot circuit 13. The one-shot circuit 13 operates for a predetermined time t (−
During CR), a "H° level signal is output and the FET 14 is operated (Fig. 5 (C)). Due to this operation of the FET 14, the level at the P3 point falls to the ground, and no vibration signal is output. At the same time, the cutoff transistor 8 also returns to the off state, but since the time for the FET 14 to turn on is faster than this return operation, the vibration return signal is output at t.
There is no vibration signal output until time elapses (Fig. 5 (D
)). Therefore, the output of the vibration signal is delayed until the sudden change in output due to the alternating current change discharged from the capacitor 9 at the time of recovery from the disconnection converges, and it is possible to prevent the occurrence of a turbine trip due to the sudden change in output. In this embodiment, the vibration signal cutoff circuit 11 is built into the vibration circuit board 2, but only the vibration signal cutoff circuit 11 is constructed separately as shown in FIG. Signal line 1 [Deprivation of the invention #] As explained above, according to the vibration measuring device according to the present invention, the vibration signal output is cut off until the sudden change due to the disconnection recovery of the vibration detector is converged. Malfunctions such as turbine trips caused by sudden changes can be prevented, and the reliability of the device is improved.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明に係る振動測定装置の一実施例を示す構
成図、第2図は同実施例の作用説明用のタイムチャート
、第3図は本発明の他の実施例を示す構成図、第4図は
従来の振動測定装置の一例を示す構成図、第5図は同従
来例の作用説明用のタイムチャートである。 1・・・振動検出器 2・・・振動サーキットボード 3・・・積分器 6・・・断線検出回路 7・・・断線検出用トランジスタ 8・・・出力しゃ断用トランジスタ 9・・・カップリングコンデンサ 11・・・振動信号しゃ断回路 12・・・コ ンパレータ 1 3・・・ワンショ ト回路 14・・・FET
Fig. 1 is a block diagram showing an embodiment of a vibration measuring device according to the present invention, Fig. 2 is a time chart for explaining the operation of the same embodiment, and Fig. 3 is a block diagram showing another embodiment of the present invention. , FIG. 4 is a configuration diagram showing an example of a conventional vibration measuring device, and FIG. 5 is a time chart for explaining the operation of the conventional example. 1... Vibration detector 2... Vibration circuit board 3... Integrator 6... Disconnection detection circuit 7... Disconnection detection transistor 8... Output cutoff transistor 9... Coupling capacitor 11... Vibration signal cutoff circuit 12... Comparator 1 3... One-shot circuit 14... FET

Claims (1)

【特許請求の範囲】 回転機械の回転軸等の振動量を検出する振動検出器と、 この振動検出器の交流出力を積分して振動量相当の振動
信号を生成する積分器を有する振動検出部と、 前記振動検出器に抵抗器を介して直流バイアス電圧を印
加し、振動検出器の断線時には前記抵抗器に生ずる電圧
降下を検出して断線発生信号を出力する断線検出部と、 前記振動検出器の断線復帰時に前記積分器から出力され
る出力突変が収束するまで前記振動信号の出力をしゃ断
する振動信号しゃ断部と、 を具備して成ることを特徴とする振動判定装置。
[Scope of Claims] A vibration detection unit that includes a vibration detector that detects the amount of vibration of a rotating shaft of a rotating machine, etc., and an integrator that integrates the AC output of the vibration detector to generate a vibration signal corresponding to the amount of vibration. and a disconnection detection unit that applies a DC bias voltage to the vibration detector via a resistor, detects a voltage drop that occurs in the resistor when the vibration detector is disconnected, and outputs a disconnection occurrence signal; and the vibration detection unit A vibration determination device comprising: a vibration signal cutoff section that cuts off the output of the vibration signal until a sudden change in output output from the integrator converges when a disconnection of the device is restored.
JP29976389A 1989-11-20 1989-11-20 Vibration measuring device Expired - Lifetime JP2614335B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29976389A JP2614335B2 (en) 1989-11-20 1989-11-20 Vibration measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29976389A JP2614335B2 (en) 1989-11-20 1989-11-20 Vibration measuring device

Publications (2)

Publication Number Publication Date
JPH03160327A true JPH03160327A (en) 1991-07-10
JP2614335B2 JP2614335B2 (en) 1997-05-28

Family

ID=17876677

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29976389A Expired - Lifetime JP2614335B2 (en) 1989-11-20 1989-11-20 Vibration measuring device

Country Status (1)

Country Link
JP (1) JP2614335B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04184125A (en) * 1990-11-16 1992-07-01 Mitsubishi Electric Corp Vibration measurement device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04184125A (en) * 1990-11-16 1992-07-01 Mitsubishi Electric Corp Vibration measurement device

Also Published As

Publication number Publication date
JP2614335B2 (en) 1997-05-28

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