JP2008295252A - Rotary rectifier fault detector and protection device of brushless synchronous machine - Google Patents

Rotary rectifier fault detector and protection device of brushless synchronous machine Download PDF

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JP2008295252A
JP2008295252A JP2007140033A JP2007140033A JP2008295252A JP 2008295252 A JP2008295252 A JP 2008295252A JP 2007140033 A JP2007140033 A JP 2007140033A JP 2007140033 A JP2007140033 A JP 2007140033A JP 2008295252 A JP2008295252 A JP 2008295252A
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rectifier
synchronous machine
brushless synchronous
rotation
failure mode
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Yasunobu Kono
泰信 河野
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Mitsubishi Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary rectifier fault detector of a brushless synchronous machine which detects a fault, without providing a detection coil, and without memorizing beforehand correlation of operation data at normal time. <P>SOLUTION: When the fault is generated in a rotary rectifier 3, such as opening and a short circuit of a diode 3a, a proportion of an AC component to a DC component in an exciter field current J increases. In the rotary rectifier fault detector 20, a difference C between a DC current value A and an AC effective value amount B is obtained, wherein the DC current value is obtained by passing the exciter field current J through a DC filter 22, while the AC effective value amount is obtained by multiplying an output of a root-mean-square operational circuit 23 by a gain K. When the difference C exceeds a prescribed value D, an abnormal signal S2 is generated from a timer 32. Moreover, as a harmonic component increases when the diode 3a is short-circuited, when an output E of a band pass filter 42 exceeds a prescribed value F, a second comparator 43 judges that a phase short circuit fault is generated to produce a signal S4, and a protective trip circuit 50 generates a generator stop signal S6 on an AND condition of the signals S2, S4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、ブラシレス同期機の回転整流器故障検出装置及び保護装置に関する。   The present invention relates to a rotation rectifier failure detection device and a protection device for a brushless synchronous machine.

従来のブラシレス同期機の回転整流器故障検出装置において、交流励磁機に検出コイルを設け、検出コイルに誘起される電圧の周波数成分を能動フィルタ回路により判別し、整流器の故障の有無を判別するものがある（例えば、特許文献１参照）。また、検出コイルを用いることなく、整流器故障検出装置に入力されたブラシレス同期発電機の界磁電流、発電機電圧、発電機電流から、発電機電力、発電機無効電力を演算し、これらの相関関係と予め記憶している正常時の相関関係とを比較して故障判定を行うものがある（例えば、特許文献２参照）。   In a conventional rotary rectifier failure detection device for a brushless synchronous machine, a detection coil is provided in an AC exciter, the frequency component of the voltage induced in the detection coil is determined by an active filter circuit, and the presence or absence of a rectifier failure is determined. Yes (see, for example, Patent Document 1). Also, without using a detection coil, the generator power and generator reactive power are calculated from the field current, generator voltage, and generator current of the brushless synchronous generator input to the rectifier failure detection device, and the correlation between them is calculated. There is one that makes a failure determination by comparing the relationship with a normal correlation stored in advance (see, for example, Patent Document 2).

特開平４−２８５４５７号公報（段落番号００１３及び図１）JP-A-4-285457 (paragraph number 0013 and FIG. 1) 特開平１１−３４６４９９号公報（段落番号００２０、００２１及び図１）Japanese Unexamined Patent Publication No. 11-346499 (paragraph numbers 0020 and 0021 and FIG. 1)

従来のブラシレス同期機の回転整流器故障検出装置は以上のように構成され、交流励磁機に検出コイルを設けブラシを介して信号を取り出す必要があるため、装置が複雑になり、またブラシの余分な保守を要するという問題点があった。また、このような検出コイルを用いないで複雑な装置を簡略化するために、発電機電力、無効電力、界磁電流等の計測値の相関関係の変化から回転整流器故障を判定する試みもなされてきたが、予め正常時の運転データの相関関係を判定基準として組込む必要があり、ブラシレス同期発電機毎に実機測定しなければならず実際に適用するためには手間がかかるという問題点があった。   The conventional rotary rectifier failure detection device for a brushless synchronous machine is configured as described above, and it is necessary to provide a detection coil in the AC exciter and to extract a signal through the brush. There was a problem of requiring maintenance. In addition, in order to simplify a complicated apparatus without using such a detection coil, an attempt is made to determine a rotary rectifier failure from a change in the correlation of measured values such as generator power, reactive power, and field current. However, there is a problem that it is necessary to incorporate the correlation of normal operation data as a criterion in advance, and it is necessary to measure the actual machine for each brushless synchronous generator, and it takes time and effort to actually apply it. It was.

この発明は上記のような問題点を解決するためになされたものであり、検出コイルを設けることなく、また予め正常時の運転データの相関関係を記憶しておくことなく、励磁機界磁電流に基づいて回転整流器の故障を検出できるブラシレス同期機の回転整流器故障検出装置及び故障時の保護を行うことのできる保護装置を得ることを目的とする。   The present invention has been made in order to solve the above-described problems. Exciter field currents are not provided without providing a detection coil and without previously storing the correlation of normal operation data. It is an object of the present invention to provide a rotary rectifier failure detection device for a brushless synchronous machine that can detect a failure of a rotary rectifier and a protection device that can protect against failure.

この発明に係るブラシレス同期機の回転整流器故障検出装置においては、ブラシレス同期機の回転界磁を励磁する回転整流器に交流電力を供給する交流励磁機の励磁機界磁電流の直流分と交流分とに基づいて回転整流器の異常を検出し異常検出信号を発する回転整流器異常検出装置を備えたものである。   In the rotation rectifier failure detection device for a brushless synchronous machine according to the present invention, the DC component and the AC component of the exciter field current of the AC exciter that supplies AC power to the rotary rectifier that excites the rotary field of the brushless synchronous machine. Is provided with a rotation rectifier abnormality detection device that detects an abnormality of the rotation rectifier and generates an abnormality detection signal.

そして、ブラシレス同期機の回転界磁を励磁する回転整流器に交流電力を供給する交流励磁機の励磁機界磁電流をデジタルサンプリングしたデジタルサンプリング値の周波数成分から回転整流器の故障モードが相短絡か相開放かを判定する故障モード判定装置を備えたものである。   Then, the failure mode of the rotary rectifier is phase short-circuited or phase-shifted from the frequency component of the digital sampling value obtained by digitally sampling the exciter field current of the AC exciter that supplies AC power to the rotary rectifier that excites the rotary field of the brushless synchronous machine. A failure mode determination device for determining whether to open is provided.

さらに、回転整流器異常検出装置と、故障モード判定装置とを備えたものである。   Furthermore, a rotation rectifier abnormality detection device and a failure mode determination device are provided.

また、この発明に係るブラシレス同期機の保護装置においては、ブラシレス同期機の回転整流器故障検出装置と、回転整流器異常検出装置から異常検出信号が発信されるとともに故障モード判定装置が回転整流器の故障モードが相短絡であると判定したときにブラシレス同期機を停止する停止指令を発信する停止指令信号発信装置とを備えたものである。   Further, in the brushless synchronous machine protection device according to the present invention, the rotation rectifier failure detection device of the brushless synchronous machine and the abnormality detection signal are transmitted from the rotation rectifier abnormality detection device and the failure mode determination device is the failure mode of the rotation rectifier. Is provided with a stop command signal transmission device for transmitting a stop command for stopping the brushless synchronous machine when it is determined that is a phase short circuit.

そして、この発明に係るブラシレス同期機の保護装置においては、ブラシレス同期機の回転界磁の励磁電流の喪失を検出する発電機界磁喪失継電器と、発電機界磁喪失継電器が動作したときデジタルサンプリング値の周波数成分から回転整流器の故障モードが相短絡か相開放かを判定する故障モード判定装置とを備えたものである。   In the protection device for the brushless synchronous machine according to the present invention, the generator field loss relay for detecting the loss of the excitation current of the rotating field of the brushless synchronous machine, and the digital sampling when the generator field loss relay operates. And a failure mode determination device that determines whether the failure mode of the rotary rectifier is a phase short circuit or a phase release from the frequency component of the value.

さらに、この発明に係るブラシレス同期機の保護装置においては、故障モード判定装置と、この故障モード判定装置が回転整流器の故障モードが相開放であると判定したときにブラシレス同期機の回転界磁の励磁電流を一定値に制御する界磁電流一定制御装置とを備えたものである。   Furthermore, in the protection device for a brushless synchronous machine according to the present invention, the failure mode determination device and the rotational field of the brushless synchronous machine when the failure mode determination device determines that the failure mode of the rotary rectifier is phase open. And a field current constant control device for controlling the excitation current to a constant value.

この発明に係るブラシレス同期機の回転整流器故障検出装置は、ブラシレス同期機の回転界磁を励磁する回転整流器に交流電力を供給する交流励磁機の励磁機界磁電流の直流分と交流分とに基づいて回転整流器の異常を検出し異常検出信号を発する回転整流器異常検出装置を備えたものであるので、検出コイルを設けることなく、また予め正常時の運転データを記憶しておくことなく、励磁機界磁電流に基づいて回転整流器の故障を検出できる。   According to the present invention, there is provided a rotation rectifier failure detection device for a brushless synchronous machine, wherein a DC component and an AC component of an exciter field current of an AC exciter that supplies AC power to a rotary rectifier that excites a rotating field of the brushless synchronous machine. Based on the rotation rectifier abnormality detection device that detects the abnormality of the rotary rectifier and generates an abnormality detection signal based on the excitation, without providing a detection coil and storing normal operation data in advance. A fault of the rotary rectifier can be detected based on the machine field current.

そして、ブラシレス同期機の回転界磁を励磁する回転整流器に交流電力を供給する交流励磁機の励磁機界磁電流をデジタルサンプリングしたデジタルサンプリング値の周波数成分から回転整流器の故障モードが相短絡か相開放かを判定する故障モード判定装置を備えたものであるので、デジタル処理により容易に故障モードを判定することができる。   Then, the failure mode of the rotary rectifier is phase short-circuited or phase-shifted from the frequency component of the digital sampling value obtained by digitally sampling the exciter field current of the AC exciter that supplies AC power to the rotary rectifier that excites the rotary field of the brushless synchronous machine. Since the apparatus is provided with a failure mode determination device that determines whether it is open or not, the failure mode can be easily determined by digital processing.

さらに、回転整流器異常検出装置と、故障モード判定装置との双方を備えたものであるので、回転整流器の故障及び短絡か開放かの故障モードを検出できる。   Further, since both the rotation rectifier abnormality detection device and the failure mode determination device are provided, it is possible to detect a failure of the rotation rectifier and a failure mode of short circuit or open.

また、この発明に係るブラシレス同期機の保護装置は、ブラシレス同期機の回転整流器故障検出装置と、回転整流器異常検出装置から異常検出信号が発信されるとともに故障モード判定装置が回転整流器の故障モードが相短絡であると判定したときにブラシレス同期機を停止する停止指令を発信する停止指令信号発信装置とを備えたものであるので、回転整流器の故障を検出してブラシレス同期機を確実に保護できる。   Further, the protection device for a brushless synchronous machine according to the present invention includes a rotation rectifier failure detection device for the brushless synchronous machine and an abnormality detection signal transmitted from the rotation rectifier abnormality detection device, and the failure mode determination device indicates a failure mode of the rotary rectifier. Since it is equipped with a stop command signal transmission device that transmits a stop command to stop the brushless synchronous machine when it is determined that the phase is short-circuited, the brushless synchronous machine can be reliably protected by detecting a failure of the rotary rectifier .

そして、ブラシレス同期機の回転界磁の励磁電流の喪失を検出する発電機界磁喪失継電器と、発電機界磁喪失継電器が動作したときデジタルサンプリング値の周波数成分から回転整流器の故障モードが相短絡か相開放かを判定する故障モード判定装置とを備えたものであるので、信頼性の高い外部の発電機界磁喪失継電器によりブラシレス同期機の保護を行うことが可能となるとともに、故障モードの判定が可能となる。   And when the generator field loss relay detects the loss of the excitation current of the rotating field of the brushless synchronous machine, and when the generator field loss relay operates, the failure mode of the rotary rectifier is a phase short circuit from the frequency component of the digital sampling value And a failure mode determination device that determines whether the phase is open or not, so that it is possible to protect the brushless synchronous machine with a reliable external generator field loss relay and Judgment is possible.

さらに、故障モード判定装置と、この故障モード判定装置が回転整流器の故障モードが相開放であると判定したときにブラシレス同期機の回転界磁の励磁電流を一定値に制御する界磁電流一定制御装置とを備えたものであるので、故障モードが相開放である場合はブラシレス同期機を必ずしも停止させる必要はなく、ブラシレス同期機の回転界磁の励磁電流を一定値に制御して過励磁を防止することができる。   Furthermore, a failure mode determination device and a field current constant control for controlling the excitation current of the rotating field of the brushless synchronous machine to a constant value when the failure mode determination device determines that the failure mode of the rotary rectifier is phase open. When the failure mode is phase open, it is not always necessary to stop the brushless synchronous machine, and the excitation current of the rotating field of the brushless synchronous machine is controlled to a constant value to perform overexcitation. Can be prevented.

実施の形態１．
図１は、この発明を実施するための実施の形態１であるブラシレス同期機の回転整流器故障検出装置及び保護装置の構成を示す構成図である。図１において、同期発電機１は発電機界磁巻線１ａを有する。交流励磁機４によりダイオード３ａを有する回転整流器３を介して発電機界磁巻線１ａに直流を供給し励磁する。交流励磁機４の励磁機界磁巻線４ａは、シャント抵抗５，６を介して励磁装置７に接続されている。また、励磁装置７は、励磁用変圧器８を介して同期発電機１に接続され、励磁用電力の供給を受ける。回転整流器異常検出装置２０は、絶縁アンプ２１、直流フィルタ２２、二乗平均演算回路２３、ゲイン設定器２４、減算器２６、第１の比較器２７、第１の基準値を設定する第１の設定器２８、故障検出信号リレー３１、タイマ３２を有する。 Embodiment 1 FIG.
FIG. 1 is a configuration diagram showing the configuration of a rotary rectifier failure detection device and a protection device for a brushless synchronous machine according to Embodiment 1 for carrying out the present invention. In FIG. 1, a synchronous generator 1 has a generator field winding 1a. An alternating current exciter 4 supplies a direct current to the generator field winding 1a via a rotary rectifier 3 having a diode 3a to excite it. The exciter field winding 4 a of the AC exciter 4 is connected to the exciter 7 through shunt resistors 5 and 6. The excitation device 7 is connected to the synchronous generator 1 via the excitation transformer 8 and receives supply of excitation power. The rotary rectifier abnormality detection device 20 includes an insulation amplifier 21, a DC filter 22, a root mean square arithmetic circuit 23, a gain setting unit 24, a subtractor 26, a first comparator 27, and a first setting for setting a first reference value. Device 28, failure detection signal relay 31, and timer 32.

故障モード判定装置４０は、励磁機界磁電流Ｊをデジタルサンプリングしてデジタルサンプリング値として記憶するデジタルサンプリング値記憶手段４１、バンドパスフィルタ（ＢＰＦ）４２、第２の比較器４３、第２の基準値を設定する第２の設定器４４、相短絡検出信号リレー４５を有する。停止指令信号発信装置としての保護トリップ回路５０は、ＡＮＤ回路５１とトリップ出力信号リレー５２を有する。なお、この発明におけるブラシレス同期機の保護装置は、回転整流器異常検出装置２０、故障モード判定装置４０、保護トリップ回路５０を備えている。   The failure mode determination device 40 includes a digital sampling value storage means 41 for digitally sampling the exciter field current J and storing it as a digital sampling value, a band pass filter (BPF) 42, a second comparator 43, and a second reference. It has the 2nd setting device 44 and the phase short circuit detection signal relay 45 which set a value. The protection trip circuit 50 as a stop command signal transmission device includes an AND circuit 51 and a trip output signal relay 52. The protection device for a brushless synchronous machine according to the present invention includes a rotary rectifier abnormality detection device 20, a failure mode determination device 40, and a protection trip circuit 50.

次に動作について説明する。同期発電機１は発電機界磁巻線１ａにより励磁されている。発電機界磁巻線１ａに流れる界磁電流の電源は交流励磁機４から供給され回転整流器３により直流に変換される。交流励磁機４は、その励磁機界磁巻線４ａに自動電圧調整装置７から供給される励磁機界磁電流Ｊにより励磁される。この励磁機界磁電流Ｊには交流励磁機４の周波数ｆに対し第６高調波（ｆ×６）が常時発生しており、励磁機界磁巻線４ａに当該第６高調波の交流電圧が誘起される。ここで、ダイオード３ａの開放や短絡など回転整流器３に故障が生じた場合、励磁機界磁巻線４ａを流れる励磁機界磁電流Ｊに重畳する交流電流が増加する。従って、励磁機界磁電流Ｊ中の直流成分に対する交流成分の割合が増加する。   Next, the operation will be described. The synchronous generator 1 is excited by a generator field winding 1a. The power supply for the field current flowing through the generator field winding 1 a is supplied from the AC exciter 4 and converted to DC by the rotary rectifier 3. The AC exciter 4 is excited by the exciter field current J supplied from the automatic voltage regulator 7 to the exciter field winding 4a. In this exciter field current J, a sixth harmonic (f × 6) is always generated with respect to the frequency f of the AC exciter 4, and the sixth harmonic AC voltage is applied to the exciter field winding 4a. Is induced. Here, when a failure occurs in the rotary rectifier 3 such as an open or short circuit of the diode 3a, an alternating current superimposed on the exciter field current J flowing through the exciter field winding 4a increases. Accordingly, the ratio of the AC component to the DC component in the exciter field current J increases.

そこで、回転整流器異常検出装置２０において、シャント抵抗５により測定された励磁機界磁電流Ｊを絶縁アンプ２１にて増幅して、直流フィルタ２２により平滑化して得られる直流電流値（Ｊｄｃ）Ａと、二乗平均演算回路２３からの出力（Ｊａｃ）にゲイン設定器２４により所定のゲインＫを乗じて得られた交流実効値分Ｂとを減算器２６に入力し、両者の差Ｃ（Ｃ＝Ａ−Ｂ）を得る。第１の比較器２７は、減算器２６から出力される差Ｃが、第１の設定器２８に設定された所定値Ｄよりも小さくなった場合に、故障検出信号リレー３１から異常検出信号Ｓ１を発信させる。誤動作を防止するために、タイマ３２は異常検出信号Ｓ１を受信して、所定の時限後に異常警報信号としての回転整流器故障検出信号Ｓ２を出力する。なお、回転整流器異常検出装置２０は全てアナログ回路にて実現されている。   Therefore, in the rotary rectifier abnormality detection device 20, the exciter field current J measured by the shunt resistor 5 is amplified by the insulation amplifier 21 and smoothed by the DC filter 22, and the direct current value (Jdc) A is obtained. The AC effective value B obtained by multiplying the output (Jac) from the mean square arithmetic circuit 23 by a predetermined gain K by the gain setting unit 24 is input to the subtractor 26, and the difference C (C = A) between them is input. -B) is obtained. When the difference C output from the subtracter 26 becomes smaller than the predetermined value D set in the first setter 28, the first comparator 27 receives the abnormality detection signal S1 from the failure detection signal relay 31. Make a call. In order to prevent malfunction, the timer 32 receives the abnormality detection signal S1 and outputs a rotation rectifier failure detection signal S2 as an abnormality alarm signal after a predetermined time period. The rotation rectifier abnormality detection device 20 is all realized by an analog circuit.

一方、回転整流器故障には前述の通り相短絡と相開放の２つの故障モードが存在するが、相短絡時には高調波成分が大きく増加する。そこで、シャント抵抗６にて検出された励磁機界磁電流Ｊをデジタルサンプリングして、デジタルサンプリング値記憶手段４１にてデジタルサンプリング値として記憶する。この記憶されたデジタルサンプリング値をバンドパスフィルタ４２により処理して所定の周波数成分であるその出力Ｅと、第２の設定器４４に設定された所定値である基準値Ｆと、を第２の比較器４３にて比較して、出力Ｅが設定値Ｆよりも大きくなった場合に、回転整流器３の相短絡故障と判定し、相短絡検出信号リレー４５を動作させ、相短絡検出信号Ｓ４を出力させる。   On the other hand, there are two failure modes, phase short-circuit and phase-open, as described above for rotary rectifier failure, but the harmonic components greatly increase when the phase is short-circuited. Therefore, the exciter field current J detected by the shunt resistor 6 is digitally sampled and stored in the digital sampling value storage means 41 as a digital sampling value. The stored digital sampling value is processed by the band-pass filter 42 and its output E, which is a predetermined frequency component, and a reference value F, which is a predetermined value set in the second setter 44, are converted into a second value. When the output E becomes larger than the set value F as compared with the comparator 43, it is determined that the phase rectifier 3 is in a phase short circuit failure, the phase short circuit detection signal relay 45 is operated, and the phase short circuit detection signal S4 is Output.

そして、ＡＮＤ回路５１にて相短絡検出信号Ｓ４と前述の回転整流器故障検出信号Ｓ２とのＡＮＤ条件を判定してＡＮＤ条件を満たせばトリップ出力信号リレー５２を励磁し、相短絡時のみ選択的に停止指令である発電機停止信号Ｓ６を出力し、図示しない停止制御装置を介して同期発電機１を停止させる。なお、回転整流器故障検出信号Ｓ２と相短絡検出信号Ｓ４とのＡＮＤ条件が満たされないときは、重故障ではないとして、発電機停止信号Ｓ６を発信しない。   Then, the AND circuit 51 determines the AND condition of the phase short circuit detection signal S4 and the aforementioned rotation rectifier failure detection signal S2, and if the AND condition is satisfied, the trip output signal relay 52 is excited, and selectively only when the phase is short circuited. A generator stop signal S6, which is a stop command, is output, and the synchronous generator 1 is stopped via a stop control device (not shown). Note that when the AND condition between the rotational rectifier failure detection signal S2 and the phase short circuit detection signal S4 is not satisfied, the generator stop signal S6 is not transmitted because it is not a serious failure.

これにより、検出コイルを設けることなく、また従来のように予め正常時の運転データの相関関係を記憶しておくことなく、励磁機界磁電流に基づいて簡易な構成で故障を検出できるブラシレス同期機の回転整流器故障検出装置及びブラシレス同期機の保護を行うことのできる保護装置を得ることができる。また、励磁機界磁電流Ｊについての、デジタルサンプリング値記憶手段４１、バンドパスフィルタ４２、第２の比較器４３、第２の設定器４４による一連のデジタル処理により、容易に回転整流器の故障モードを判定することができる。   This makes it possible to detect a fault with a simple configuration based on the exciter field current without providing a detection coil and without storing the correlation of normal operation data in advance as in the past. It is possible to obtain a protection device capable of protecting the rotation rectifier failure detection device of the machine and the brushless synchronous machine. Further, the failure mode of the rotary rectifier can be easily obtained by a series of digital processing of the exciter field current J by the digital sampling value storage means 41, the band pass filter 42, the second comparator 43, and the second setter 44. Can be determined.

実施の形態２．
図２は、この発明の実施の形態２であるブラシレス同期機の回転整流器故障検出装置及び保護装置の構成を示す構成図である。上記実施の形態１では、回転整流器故障検出の誤動作を防止するため図１のタイマ３２を設けていたが、図２の通りタイマを省略した回転整流器異常検出装置１２０を設けることも可能である。この場合、故障モード判定装置４０により回転整流器の故障モードを検出し、ＡＮＤ回路５１にて相短絡検出信号Ｓ４と前述の異常検出信号Ｓ１とのＡＮＤ条件を判定して発電機停止信号Ｓ６を発信するため、信頼性を損なうことなくタイマの時限の分だけ早く同期発電機１の停止を行うことができる。 Embodiment 2. FIG.
FIG. 2 is a block diagram showing the configuration of the rotation rectifier failure detection device and the protection device of the brushless synchronous machine according to Embodiment 2 of the present invention. In the first embodiment, the timer 32 of FIG. 1 is provided in order to prevent malfunction of rotation rectifier failure detection, but it is also possible to provide a rotation rectifier abnormality detection device 120 in which the timer is omitted as shown in FIG. In this case, the failure mode determination device 40 detects the failure mode of the rotary rectifier, the AND circuit 51 determines the AND condition between the phase short-circuit detection signal S4 and the above-described abnormality detection signal S1, and transmits the generator stop signal S6. Therefore, the synchronous generator 1 can be stopped earlier by the time limit of the timer without impairing the reliability.

実施の形態３．
図３は、この発明の実施の形態３であるブラシレス同期機の回転整流器故障検出装置及び保護装置の構成を示す構成図である。実施の形態１では図１の回転整流器異常検出装置２０はアナログ回路で構成されていたが、回転整流器故障検出を図３の通り全てデジタル処理にて行うこともできる。図３において、回転整流器異常検出及び故障モード判定装置６０は、次のように構成され、動作する。デジタルサンプリング値記憶手段４１に記憶された励磁機界磁電流Ｊのデジタルサンプリング値についてバンドパスフィルタ４２により所定の周波数成分の出力Ｅを取出し、第２の設定器４４の設定値Ｆと比較し、Ｅ＞Ｆのとき相短絡検出信号Ｓ４を発信するのは、図１の実施の形態１と同様である。 Embodiment 3 FIG.
FIG. 3 is a block diagram showing the configuration of the rotation rectifier failure detection device and the protection device for a brushless synchronous machine according to Embodiment 3 of the present invention. In the first embodiment, the rotational rectifier abnormality detection device 20 of FIG. 1 is configured by an analog circuit, but the rotational rectifier failure detection can also be performed by digital processing as shown in FIG. In FIG. 3, the rotation rectifier abnormality detection and failure mode determination device 60 is configured and operates as follows. With respect to the digital sampling value of the exciter field current J stored in the digital sampling value storage means 41, an output E of a predetermined frequency component is taken out by the band pass filter 42 and compared with the setting value F of the second setting device 44; The phase short circuit detection signal S4 is transmitted when E> F, as in the first embodiment of FIG.

一方、直流平滑フィルタ６１にて励磁機界磁電流Ｊのデジタルサンプリング値の移動平均値として直流成分Ｇを求め、交流実効値演算手段６２にて交流実効値Ｈを求める。比率演算手段６３にて、両者の比率Ｒ＝Ｈ／Ｇを求め、第３の比較手段６４は比率Ｒが第３の設定器６５に記憶された所定値である第３の基準値Ｍよりも大きいとき（Ｒ＞Ｍ）、回転整流器故障であるとして、比率信号リレー６６を介して比率検出信号Ｓ５を出力する。ＡＮＤ回路５１にて相短絡検出信号Ｓ４と比率検出信号Ｓ５とのＡＮＤ条件を判定して、相短絡発生信号発信手段５２から発電機停止信号Ｓ６が発信される。なお、相短絡検出信号Ｓ４と比率検出信号Ｓ５とのＡＮＤ条件が満たされないときは、重故障ではないとして、発電機停止信号Ｓ６を発信しない。   On the other hand, a DC component G is obtained as a moving average value of the digital sampling value of the exciter field current J by the DC smoothing filter 61, and an AC effective value H is obtained by the AC effective value calculation means 62. The ratio calculating means 63 obtains the ratio R = H / G of the two, and the third comparing means 64 is more than the third reference value M in which the ratio R is a predetermined value stored in the third setting device 65. When the ratio is large (R> M), the ratio detection signal S5 is output via the ratio signal relay 66 because the rotation rectifier is malfunctioning. The AND circuit 51 determines an AND condition between the phase short circuit detection signal S4 and the ratio detection signal S5, and a generator stop signal S6 is transmitted from the phase short circuit occurrence signal transmission means 52. When the AND condition of the phase short circuit detection signal S4 and the ratio detection signal S5 is not satisfied, the generator stop signal S6 is not transmitted because it is not a serious failure.

このように、デジタル演算による判定処理を実施することが可能となるため、アナログ回路では構成することが困難だった本来の検出方式である比率演算手段６３による故障判定が可能となる。これによりアナログ回路省略によるハードウェアの簡略化と故障判定の信頼性向上を図ることができる。   In this way, determination processing by digital calculation can be performed, so that failure determination by the ratio calculation means 63, which is an original detection method that has been difficult to configure with an analog circuit, is possible. As a result, the hardware can be simplified and the reliability of failure determination can be improved by omitting the analog circuit.

実施の形態４．
図４は、この発明の実施の形態４であるブラシレス同期機の回転整流器故障検出装置及び保護装置の構成を示す構成図である。回転整流器故障時には界磁電流が不足した状態となる。このとき、図４に示すように発電機界磁喪失継電器１６を設置している場合、これによるトリップ保護が可能なため、実施の形態３の図３におけるＡＮＤ回路５１及びトリップ出力信号リレー５２による同期発電機停止を省略することが可能である。ただし、このままでは故障モードの判定が困難となるため、回転整流器異常検出及び故障モード判定装置７０において、故障解析開始手段７１を設けて、発電機界磁喪失継電器１６が動作したときに故障解析開始指令Ｓ１０を出力し、デジタルサンプリング値記憶手段４１に取込んだ励磁機界磁電流Ｊのデジタルサンプリング値を解析する処理を行うようにしている。 Embodiment 4 FIG.
FIG. 4 is a block diagram showing the configuration of the rotation rectifier failure detection device and protection device for a brushless synchronous machine according to Embodiment 4 of the present invention. When the rotary rectifier fails, the field current becomes insufficient. At this time, when the generator field loss relay 16 is installed as shown in FIG. 4, the trip protection by this is possible, so the AND circuit 51 and the trip output signal relay 52 in FIG. It is possible to omit the synchronous generator stop. However, since it is difficult to determine the failure mode as it is, failure analysis start means 71 is provided in the rotation rectifier abnormality detection and failure mode determination device 70, and failure analysis starts when the generator field loss relay 16 operates. A command S10 is output, and processing for analyzing the digital sampling value of the exciter field current J taken into the digital sampling value storage means 41 is performed.

バンドパスフィルタ４２、直流平滑フィルタ６１、交流実効値演算手段６２、比率演算手段６３、第３の比較手段６４、比率信号リレー６６による一連の故障解析処理は図３に示した実施の形態３と同様であり、相短絡検出信号リレー４５及び比率信号リレー６６からそれぞれ相短絡検出信号Ｓ４、比率検出信号Ｓ５が出力されると、信号出力回路８０の相短絡発生信号発信手段８１から相短絡信号Ｓ９が発信される。これにより、回転整流器の故障モードは相短絡故障であることを知ることができる。   A series of failure analysis processing by the bandpass filter 42, the DC smoothing filter 61, the AC effective value calculation means 62, the ratio calculation means 63, the third comparison means 64, and the ratio signal relay 66 is the same as that of the third embodiment shown in FIG. Similarly, when the phase short circuit detection signal S4 and the ratio detection signal S5 are output from the phase short circuit detection signal relay 45 and the ratio signal relay 66, respectively, the phase short circuit signal S9 is output from the phase short circuit occurrence signal transmission means 81 of the signal output circuit 80. Is sent. Thereby, it can be known that the failure mode of the rotary rectifier is a phase short-circuit failure.

このように、発電機界磁喪失継電器１６が動作したときに故障解析処理を行うようにすることにより、回転整流器の故障が相短絡故障であることを事後に判定することが可能となる。従って、信頼性の高い外部の発電機界磁喪失継電器１６によりブラシレス同期機の保護を行うことが可能となるとともに、故障モードの判定が可能となる。   Thus, by performing the failure analysis process when the generator field loss relay 16 is operated, it is possible to determine afterwards that the failure of the rotary rectifier is a phase short-circuit failure. Therefore, it is possible to protect the brushless synchronous machine by the highly reliable external generator field loss relay 16 and to determine the failure mode.

実施の形態５．
図５は、この発明の実施の形態５であるブラシレス同期機の回転整流器故障検出装置及び保護装置の構成を示す構成図である。図５において、回転整流器異常検出及び故障モード判定装置９０は、実施の形態４の図４における故障解析開始手段７１を、図５のように周期的故障解析指令手段９１に置換え、所定の周期Ｔで回転整流器故障判定を繰り返すことで運転継続可能な相開放モードの回転整流器故障についても故障判定を行うことが可能としたものである。そして、相短絡時のみ選択的に信号出力回路８０の相短絡発生信号発信手段８１から相短絡信号Ｓ９が発信されるので、当該相短絡信号Ｓ９を認識した運転員が手動にて同期発電機１を停止させることができる。 Embodiment 5. FIG.
FIG. 5 is a block diagram showing the configuration of the rotation rectifier failure detection device and protection device for a brushless synchronous machine according to Embodiment 5 of the present invention. In FIG. 5, the rotation rectifier abnormality detection and failure mode determination device 90 replaces the failure analysis start means 71 in FIG. 4 of the fourth embodiment with the periodic failure analysis command means 91 as shown in FIG. Thus, it is possible to determine the failure of the rotational rectifier failure in the phase open mode that can continue operation by repeating the rotation rectifier failure determination. Since the phase short circuit signal S9 is selectively transmitted from the phase short circuit occurrence signal transmission means 81 of the signal output circuit 80 only when the phase short circuit occurs, the operator who has recognized the phase short circuit signal S9 manually operates the synchronous generator 1. Can be stopped.

実施の形態６．
図６は、この発明の実施の形態６であるブラシレス同期機の回転整流器故障検出装置及び保護装置の構成を示す構成図である。図６において、相短絡発生信号発信手段８１から相短絡信号Ｓ９が発信されると、界磁電流一定制御装置としての界磁一定モード移行手段８６が動作して界磁一定モードに移行する。その他の構成については、図５に示した実施の形態５と同様のものであるので、相当するものに同じ符号を付して説明を省略する。
励磁装置７を電圧一定モードで運転中に、相短絡信号Ｓ９が発信されたときに運転員がブラシレス同期機を停止する等の適切な処理を取れなかった場合、故障により低下するブラシレス同期機の界磁電流を補うための励磁装置の界磁電流増加により過励磁となる可能性があるが、この実施の形態のように相短絡信号Ｓ９が発信されると、界磁一定モードに移行させることで、過励磁を防止することが可能となる。 Embodiment 6 FIG.
FIG. 6 is a block diagram showing a configuration of a rotary rectifier failure detection device and a protection device for a brushless synchronous machine according to Embodiment 6 of the present invention. In FIG. 6, when the phase short circuit signal S9 is transmitted from the phase short circuit occurrence signal transmitting means 81, the field constant mode transition means 86 as the field current constant control device operates to shift to the field constant mode. Since other configurations are the same as those of the fifth embodiment shown in FIG. 5, the same reference numerals are given to the corresponding components and the description thereof is omitted.
While operating the exciter 7 in the constant voltage mode, if the operator cannot take appropriate processing such as stopping the brushless synchronous machine when the phase short circuit signal S9 is transmitted, There is a possibility of overexcitation due to an increase in the field current of the excitation device for compensating for the field current. When the phase short circuit signal S9 is transmitted as in this embodiment, the mode is changed to the constant field mode. Thus, overexcitation can be prevented.

この発明を実施するための実施の形態１であるブラシレス同期機の回転整流器故障検出装置及び保護装置の構成を示す構成図である。It is a block diagram which shows the structure of the rotation rectifier failure detection apparatus and protection apparatus of the brushless synchronous machine which is Embodiment 1 for implementing this invention. 実施の形態２であるブラシレス同期機の回転整流器故障検出装置及び保護装置の構成を示す構成図である。It is a block diagram which shows the structure of the rotation rectifier failure detection apparatus of a brushless synchronous machine which is Embodiment 2, and a protection apparatus. 実施の形態３であるブラシレス同期機の回転整流器故障検出装置及び保護装置の構成を示す構成図である。It is a block diagram which shows the structure of the rotation rectifier failure detection apparatus of a brushless synchronous machine which is Embodiment 3, and a protection apparatus. 実施の形態４であるブラシレス同期機の回転整流器故障検出装置及び保護装置の構成を示す構成図である。It is a block diagram which shows the structure of the rotation rectifier failure detection apparatus of a brushless synchronous machine which is Embodiment 4, and a protection apparatus. 実施の形態５であるブラシレス同期機の回転整流器故障検出装置及び保護装置の構成を示す構成図である。It is a block diagram which shows the structure of the rotation rectifier failure detection apparatus of a brushless synchronous machine which is Embodiment 5, and a protection apparatus. 実施の形態６であるブラシレス同期機の回転整流器故障検出装置及び保護装置の構成を示す構成図である。It is a block diagram which shows the structure of the rotation rectifier failure detection apparatus of a brushless synchronous machine which is Embodiment 6, and a protection apparatus.

符号の説明Explanation of symbols

１ 同期発電機、１ａ 発電機界磁巻線、３ 回転整流器、４ 交流励磁機、
５，６ シャント抵抗、２０，１２０ 回転整流器異常検出装置、２２ 直流フィルタ、
２３ 二乗平均演算回路、２６ 減算器、２７ 第１の比較器、２８ 第１の設定器、
３１ 故障検出信号リレー、３２ タイマ、４０ 故障モード判定装置、
４１ デジタルサンプリング値記憶手段、４２ バンドパスフィルタ、
４３ 第２の比較器、４４ 第２の設定器、４５ 相短絡検出信号リレー、
５０ 保護トリップ回路、５１ ＡＮＤ回路、５２ トリップ信号出力リレー、
６０ 回転整流器異常検出及び故障モード判定装置、６１ 直流平滑フィルタ、
６２ 交流実効値演算手段、６３ 比率演算手段、６４ 第３の比較手段、
６６ 比率信号リレー、７０ 回転整流器異常検出及び故障モード判定装置、
８０ 故障モード信号出力回路、９０ 回転整流器異常検出及び故障モード判定装置。 1 synchronous generator, 1a generator field winding, 3 rotary rectifier, 4 AC exciter,
5,6 shunt resistor, 20,120 rotary rectifier abnormality detection device, 22 DC filter,
23 root mean square arithmetic circuit, 26 subtractor, 27 first comparator, 28 first setter,
31 failure detection signal relay, 32 timer, 40 failure mode determination device,
41 digital sampling value storage means, 42 bandpass filter,
43 second comparator, 44 second setter, 45 phase short circuit detection signal relay,
50 protection trip circuit, 51 AND circuit, 52 trip signal output relay,
60 Rotary rectifier abnormality detection and failure mode determination device, 61 DC smoothing filter,
62 AC effective value calculation means, 63 ratio calculation means, 64 third comparison means,
66 ratio signal relay, 70 rotation rectifier abnormality detection and failure mode determination device,
80 failure mode signal output circuit, 90 rotation rectifier abnormality detection and failure mode determination device.

Claims (12)

ブラシレス同期機の回転界磁を励磁する回転整流器に交流電力を供給する交流励磁機の励磁機界磁電流の直流分と交流分とに基づいて上記回転整流器の異常を検出し異常検出信号を発する回転整流器異常検出装置を備えたブラシレス同期機の回転整流器故障検出装置。 Abnormality of the rotary rectifier is detected based on the DC component and AC component of the exciter field current of the AC exciter that supplies AC power to the rotary rectifier that excites the rotary field of the brushless synchronous machine, and an abnormality detection signal is issued. Rotation rectifier failure detection device for brushless synchronous machine provided with rotation rectifier abnormality detection device. 上記回転整流器異常検出装置は、上記励磁機界磁電流の直流分と交流分との差が所定値よりも小さくなったときに上記異常検出信号を発するものであることを特徴とする請求項１に記載のブラシレス同期機の回転整流器故障検出装置。 2. The rotation rectifier abnormality detection device generates the abnormality detection signal when a difference between a direct current component and an alternating current component of the exciter field current is smaller than a predetermined value. The rotation rectifier failure detection device for a brushless synchronous machine according to claim 1. 上記回転整流器異常検出装置は、上記励磁機界磁電流をデジタルサンプリングしたデジタルサンプリング値の直流分に対する交流分の割合が所定値よりも大きくなったときに上記異常検出信号を発するものであることを特徴とする請求項１に記載のブラシレス同期機の回転整流器故障検出装置。 The rotation rectifier abnormality detection device generates the abnormality detection signal when a ratio of an AC component to a DC component of a digital sampling value obtained by digitally sampling the exciter field current is larger than a predetermined value. The rotation rectifier failure detection device for a brushless synchronous machine according to claim 1, wherein: 上記回転整流器異常検出装置は、上記異常検出信号が所定時間継続したときに異常警報信号を発するものであることを特徴とする請求項１ないし３のいずれか１項に記載のブラシレス同期機の回転整流器故障検出装置。 The rotation of the brushless synchronous machine according to any one of claims 1 to 3, wherein the rotation rectifier abnormality detection device issues an abnormality alarm signal when the abnormality detection signal continues for a predetermined time. Rectifier fault detection device. ブラシレス同期機の回転界磁を励磁する回転整流器に交流電力を供給する交流励磁機の励磁機界磁電流をデジタルサンプリングしたデジタルサンプリング値の周波数成分から上記回転整流器の故障モードが相短絡か相開放かを判定する故障モード判定装置を備えたブラシレス同期機の回転整流器故障検出装置。 Supplying AC power to the rotating rectifier that excites the rotating field of the brushless synchronous machine. The failure mode of the rotating rectifier is phase short-circuited or phase-opened from the frequency component of the digital sampling value obtained by digitally sampling the exciter field current of the AC exciter. A rotation rectifier failure detection device for a brushless synchronous machine comprising a failure mode determination device for determining whether or not. 上記故障モード判定装置は、上記デジタルサンプリング値の所定の周波数成分が所定値よりも大きいとき上記回転整流器の故障モードが相短絡であると判定するものであることを特徴とする請求項５に記載のブラシレス同期機の回転整流器故障検出装置。 The said failure mode determination apparatus determines that the failure mode of the said rotary rectifier is a phase short circuit when the predetermined frequency component of the said digital sampling value is larger than a predetermined value. Rotation rectifier fault detection device for brushless synchronous machine. 上記故障モード判定装置は、動作開始指令を受けて上記デジタルサンプリング値の周波数成分から上記回転整流器の故障モードが相短絡か相開放かを判定するものであることを特徴とする請求項５に記載のブラシレス同期機の回転整流器故障検出装置。 The said failure mode determination apparatus determines whether the failure mode of the said rotation rectifier is a phase short circuit or a phase open | release from the frequency component of the said digital sampling value in response to an operation start command. Rotation rectifier fault detection device for brushless synchronous machine. 上記故障モード判定装置は、所定周期にて上記デジタルサンプリング値の周波数成分から上記回転整流器の故障モードが相短絡か相開放かを判定するものであることを特徴とする請求項５に記載のブラシレス同期機の回転整流器故障検出装置。 6. The brushless according to claim 5, wherein the failure mode determination device determines whether the failure mode of the rotary rectifier is a phase short circuit or a phase open from a frequency component of the digital sampling value at a predetermined period. Synchronous machine rotary rectifier fault detection device. 上記請求項１ないし４のいずか１項に記載の回転整流器異常検出装置と、上記請求項５ないし８のいずか１項に記載の故障モード判定装置とを備えたブラシレス同期機の回転整流器故障検出装置。 Rotation of a brushless synchronous machine provided with the rotation rectifier abnormality detection device according to any one of claims 1 to 4 and the failure mode determination device according to any one of claims 5 to 8. Rectifier fault detection device. 上記請求項９に記載のブラシレス同期機の回転整流器故障検出装置と、上記回転整流器異常検出装置から上記異常検出信号が発信されるとともに上記故障モード判定装置が上記回転整流器の故障モードが相短絡であると判定したときに上記ブラシレス同期機を停止する停止指令を発信する停止指令信号発信装置とを備えたブラシレス同期機の保護装置。 The rotation rectifier failure detection device of the brushless synchronous machine according to claim 9 and the abnormality detection signal are transmitted from the rotation rectifier abnormality detection device, and the failure mode determination device indicates that the failure mode of the rotation rectifier is a phase short circuit. A protection device for a brushless synchronous machine, comprising: a stop command signal transmitting device for transmitting a stop command for stopping the brushless synchronous machine when it is determined that there is a stop command signal. 上記ブラシレス同期機の回転界磁の励磁電流の喪失を検出する発電機界磁喪失継電器と、上記発電機界磁喪失継電器が動作したとき上記デジタルサンプリング値の周波数成分から上記回転整流器の故障モードが相短絡か相開放かを判定する上記請求項７に記載の故障モード判定装置とを備えたブラシレス同期機の保護装置。 A failure mode of the rotary rectifier is determined from a frequency component of the digital sampling value when the generator field loss relay detects the loss of the excitation current of the rotation field of the brushless synchronous machine and the generator field loss relay operates. A protection device for a brushless synchronous machine, comprising: the failure mode determination device according to claim 7 that determines whether the phase is short-circuited or phase-opened. 上記請求項５ないし８のいずか１項に記載の故障モード判定装置と、この故障モード判定装置が上記回転整流器の故障モードが相開放であると判定したときに上記ブラシレス同期機の回転界磁の励磁電流を一定値に制御する界磁電流一定制御装置とを備えたブラシレス同期機の保護装置。 The failure mode determination device according to any one of claims 5 to 8, and a rotation field of the brushless synchronous machine when the failure mode determination device determines that the failure mode of the rotary rectifier is phase open. A protection device for a brushless synchronous machine comprising a field current constant control device for controlling a magnetizing excitation current to a constant value.
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CN103308857A (en) * 2013-07-05 2013-09-18 株洲南方燃气轮机成套制造安装有限公司 Power generator rotating rectifier detecting device and method
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