JP2013106488A - Power generator exciting device and power generator exciting method - Google Patents

Power generator exciting device and power generator exciting method Download PDF

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JP2013106488A
JP2013106488A JP2011250393A JP2011250393A JP2013106488A JP 2013106488 A JP2013106488 A JP 2013106488A JP 2011250393 A JP2011250393 A JP 2011250393A JP 2011250393 A JP2011250393 A JP 2011250393A JP 2013106488 A JP2013106488 A JP 2013106488A
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generator
field current
voltage
current
threshold value
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Keisuke Sasaki
敬介 佐々木
Kenichi Sudo
憲一 須藤
Shinichi Ishizaki
伸一 石崎
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Hitachi Ltd
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Abstract

PROBLEM TO BE SOLVED: To prevent main equipment of a power generator from being damaged and prevent a field winding from being burned.SOLUTION: A power generator exciting device according to the present invention includes: a field current comparator that compares field current If, which is a detection current of an instrument current transformer, with a preset threshold value If; a power generator voltage comparator that compares a power generator voltage Vg from an instrument voltage transformer with a preset threshold value Vg; and diagnosis means for, when a result of the comparison by the field current comparator indicates that the field current If is equal to or higher than the preset threshold value Ifand a result of the comparison by the power generator voltage comparator indicates that the power generator voltage Vg is equal to or lower than the preset threshold value Vg, diagnosing that there is an abnormality and instructing to block the field current of the power generator or switch from an operation by automatic voltage regulation means to an operation by field current constant control means.

Description

本発明は発電機励磁装置及び発電機励磁方法に係り、特に、電力系統に接続された発電機の出力を、発電機の界磁巻線を流れる界磁電流によって制御するものに好適な発電機励磁装置及び発電機励磁方法に関する。   The present invention relates to a generator excitation device and a generator excitation method, and more particularly to a generator suitable for controlling an output of a generator connected to a power system by a field current flowing in a field winding of the generator. The present invention relates to an excitation device and a generator excitation method.

電力系統に電力を供給するシステムとして、界磁巻線を有する発電機と、発電機の出力を制御する発電機励磁装置とを備え、発電機を遮断器、変圧器等を介して送電系統に接続したものが知られている。   As a system for supplying power to the power system, a generator having a field winding and a generator excitation device for controlling the output of the generator are provided. The generator is connected to the power transmission system via a circuit breaker, a transformer, etc. What is connected is known.

この種の発電機励磁装置においては、発電機の出力電圧を検出し、電圧設定値との差から界磁電流を調整し、発電機出力電圧をフィードバック制御する制御方式が採用されている。   In this type of generator excitation device, a control method is adopted in which the output voltage of the generator is detected, the field current is adjusted from the difference from the voltage setting value, and the generator output voltage is feedback-controlled.

このような制御方式を採用している従来の発電機励磁装置を適用した発電機の励磁装置の全体構成を図1に示す。   FIG. 1 shows an overall configuration of a generator exciter to which a conventional generator exciter adopting such a control system is applied.

該図において、発電機1は、送電系統に電力を送る電源として、主遮断器2を介して送電線3に接続されており、発電機1の出力(電力)は、主遮断器2を介して、主変圧器(図示せず)で送電電圧に昇圧された後、送電線3に送電されるようになっている。   In the figure, a generator 1 is connected to a power transmission line 3 via a main circuit breaker 2 as a power source for transmitting power to a power transmission system, and an output (electric power) of the generator 1 is connected via the main circuit breaker 2. Then, after being boosted to a transmission voltage by a main transformer (not shown), the power is transmitted to the transmission line 3.

発電機1には、界磁電流が流れる界磁巻線4が設けられており、界磁巻線4は、シャント抵抗5、界磁遮断器6、サイリスタ整流器7を介して励磁変圧器8に接続され、界磁遮断器6とサイリスタ整流器7の間には、初励磁電源14が、初励磁開閉器15を介して接続されている。励磁変圧器8は、発電機1の出力側に接続されており、発電機1の出力電圧を降圧し、降圧した電圧をサイリスタ整流器7に出力するようになっている。   The generator 1 is provided with a field winding 4 through which a field current flows. The field winding 4 is connected to an excitation transformer 8 via a shunt resistor 5, a field breaker 6, and a thyristor rectifier 7. An initial excitation power source 14 is connected between the field breaker 6 and the thyristor rectifier 7 via an initial excitation switch 15. The excitation transformer 8 is connected to the output side of the generator 1 and steps down the output voltage of the generator 1 and outputs the stepped down voltage to the thyristor rectifier 7.

サイリスタ整流器7は、スイッチング素子としてのサイリスタを複数個備え、発電機励磁装置9の一要素である自動電圧調整装置(以下、AVRという)10からのゲート信号に従って各サイリスタがスイッチング動作することにより、励磁変圧器8の出力電流を整流するようになっている。   The thyristor rectifier 7 includes a plurality of thyristors as switching elements, and each thyristor performs a switching operation according to a gate signal from an automatic voltage regulator (hereinafter referred to as AVR) 10 that is an element of the generator excitation device 9. The output current of the excitation transformer 8 is rectified.

この整流により得られた電流は、界磁電流として、界磁遮断器6を介して界磁巻線4に供給されるようになっている。   The current obtained by this rectification is supplied to the field winding 4 via the field breaker 6 as a field current.

発電機励磁装置9には、上述したAVR10と界磁電流を一定に制御する界磁電流一定制御装置(以下、AERという)を備えており、AVR10には、サイリスタ整流器7に供給される電流を検出する計器用変流器(以下、CTという)11の検出電流が入力されると共に、発電機1の出力電圧又は端子電圧を検出する計器用変圧器(以下、PTという)12からなる発電機電圧検出用PT回路13の検出電圧が入力される。そして、これら両者の入力値に基づき発電機1の界磁電流を制御するようになっている。   The generator excitation device 9 includes the above-described AVR 10 and a field current constant control device (hereinafter referred to as AER) that controls the field current to be constant. The AVR 10 receives the current supplied to the thyristor rectifier 7. A generator comprising an instrument transformer (hereinafter referred to as PT) 12 for detecting an output voltage or a terminal voltage of the generator 1 while receiving a detection current of an instrument current transformer (hereinafter referred to as CT) 11 to be detected. The detection voltage of the voltage detection PT circuit 13 is input. The field current of the generator 1 is controlled on the basis of both input values.

ところで、複数のPT12を持つ発電機電圧検出用PT回路13には、各PT12の発電機電圧検出値の不一致を検出する60PTという機能がある。この60PTは、一方のPT回路の異常で出力低下した場合に、正常PT出力と比較して異常を検知できるが、引出型PTの復旧漏れなどのように、複数PTが全て出力ゼロとなった場合には、異常を検知できない。   By the way, the generator voltage detection PT circuit 13 having a plurality of PTs 12 has a function of 60 PT for detecting a mismatch between the generator voltage detection values of the PTs 12. This 60PT can detect an abnormality compared to the normal PT output when the output drops due to an abnormality in one of the PT circuits, but all PTs have zero output, such as a recovery leak of the extraction type PT. In this case, no abnormality can be detected.

また、発電機無回転状態において、発電機出力電圧はゼロであるためPT出力もゼロとなり、他励電源方式において、発電機励磁装置は最大出力の界磁電流を流し続ける。また、発電機1が停止している状態では、発電機1の回転に伴う冷却風が発生しないため、発電機1の回転による冷却効果が得られないことにより、界磁巻線4が焼損する危険性がある。自励電源方式においては、初励磁電源14から供給される界磁電流しか流れず、また、一定時間後に発電機電圧が上昇していないことで初励磁渋滞異常として異常診断するため、界磁巻線4が焼損する危険性は低い。   Further, in the non-rotating state of the generator, the generator output voltage is zero and therefore the PT output is also zero. In the separately excited power system, the generator exciter continues to flow the maximum output field current. In addition, in the state where the generator 1 is stopped, the cooling wind accompanying the rotation of the generator 1 is not generated, so that the cooling effect due to the rotation of the generator 1 cannot be obtained, and the field winding 4 is burned out. There is a risk. In the self-excited power supply system, only the field current supplied from the initial excitation power supply 14 flows, and since the generator voltage does not increase after a certain time, an abnormality diagnosis is performed as an initial excitation congestion abnormality. The risk of burnout of the wire 4 is low.

尚、上述した発電機励磁装置として、特許文献1を挙げることができる。   In addition, patent document 1 can be mentioned as a generator excitation apparatus mentioned above.

特開2003−250297号公報JP 2003-250297 A

発電機電圧検出用PT回路13を取り外した状態で発電機1を起動すると、発電機励磁装置9に入力される発電機電圧検出値はゼロであるため、設定値まで発電機電圧を上昇させるために最大出力の界磁電流を流し続ける。これにより、無負荷状態で大きな界磁電流が流れるために発電機過電圧となり、固定子巻線の短絡や絶縁劣化、発電機出力に接続された変圧器等の絶縁破壊や飽和による過電流などが発生する恐れがある。   When the generator 1 is started up with the generator voltage detection PT circuit 13 removed, the generator voltage detection value input to the generator excitation device 9 is zero, so that the generator voltage is increased to the set value. The maximum output field current continues to flow. As a result, a large field current flows in a no-load state, resulting in a generator overvoltage, which causes short circuit of the stator winding, insulation deterioration, overcurrent due to insulation breakdown or saturation of a transformer connected to the generator output, etc. May occur.

また、発電機無回転状態でAVR10を起動すると、自励電源方式では、初励磁電源14により界磁巻線4に界磁電流が流れ、他励電源方式では、発電機電圧検出値がゼロであるため、発電機励磁装置9から最大出力の界磁電流が流れる。発電機1の回転による冷却効果が無い状態で界磁電流が流れるため、界磁巻線4が焼損する危険性がある。   In addition, when the AVR 10 is started in a state where the generator does not rotate, in the self-excited power supply method, a field current flows to the field winding 4 from the initial excitation power supply 14, and in the separately excited power supply method, the generator voltage detection value is zero. Therefore, the maximum field current flows from the generator excitation device 9. Since the field current flows in a state where there is no cooling effect due to the rotation of the generator 1, the field winding 4 may be burned out.

本発明は上述の点に鑑みなされたもので、その目的とするところは、発電機の主機器が損傷に至ることはないし、界磁巻線が焼損することのない発電機励磁装置及び発電機励磁方法を提供することにある。   SUMMARY OF THE INVENTION The present invention has been made in view of the above-described points, and an object of the present invention is to provide a generator exciter and a generator in which the main device of the generator is not damaged and the field winding does not burn out. It is to provide an excitation method.

本発明の発電機励磁装置は、上記目的を達成するために、主遮断器を介して系統に接続される発電機の出力電圧を検出する計器用変圧器の二次電圧が入力されると共に、前記発電機の界磁電流を検出する計器用変流器での検出電流が入力され、これら両者の入力値に基づき前記発電機の界磁電流を制御する自動電圧調整手段及び界磁電流を一定に制御する界磁電流一定制御手段を備えた発電機励磁装置において、前記発電機励磁装置は、前記計器用変流器の検出電流である界磁電流Ifと予め設定されたしきい値Ifを比較する界磁電流比較器と、前記計器用変圧器からの発電機電圧Vgと予め設定されたしきい値Vgを比較する発電機電圧比較器と、前記界磁電流比較器での界磁電流Ifが予め設定されたしきい値If以上で、かつ、前記発電機電圧比較器での発電機電圧Vgが予め設定されたしきい値Vg以下の条件で異常と診断して、前記発電機の界磁電流を遮断するか若しくは前記自動電圧調整手段から前記界磁電流一定制御手段への運転切替を指令する診断手段とを備えていることを特徴とする。 In order to achieve the above object, the generator excitation device of the present invention receives the secondary voltage of an instrument transformer that detects the output voltage of the generator connected to the system via the main circuit breaker, The current detected by an instrumental current transformer for detecting the field current of the generator is input, and automatic voltage adjusting means for controlling the field current of the generator based on both input values and the field current are constant. In the generator exciter having the field current constant control means for controlling the generator current, the generator exciter includes a field current If which is a detected current of the instrument current transformer and a preset threshold value If 1. a field current comparator for comparing a generator voltage comparator for comparing the generator voltage threshold Vg 1 which is Vg with a preset from the potential transformer, boundaries in the field current comparator in current if preset threshold if 1 or more, or , The generator voltage Vg of the generator voltage comparator is diagnosed as abnormal at a preset threshold Vg 1 the following conditions, or to cut off the field current of the generator or the automatic voltage regulator Diagnostic means for commanding operation switching to the field current constant control means.

また、本発明の発電機励磁方法は、上記目的を達成するために、主遮断器を介して系統に接続される発電機の出力電圧を検出する計器用変圧器の二次電圧が入力されると共に、前記発電機の界磁電流を検出する計器用変流器での検出電流が入力される自動電圧調整手段により、前記計器用変圧器の二次電圧及び前記計器用変流器での検出電流の入力値に基づき前記発電機の界磁電流を制御する発電機励磁方法において、前記計器用変流器の検出電流である界磁電流Ifと予め設定されたしきい値Ifを界磁電流比較器で比較すると共に、前記計器用変圧器からの発電機電圧Vgと予め設定されたしきい値Vgを発電機電圧比較器で比較し、前記界磁電流Ifが予め設定されたしきい値If以上で、かつ、前記発電機電圧Vgが予め設定されたしきい値Vg以下の条件で異常と診断して、前記発電機の界磁電流を遮断するか若しくは前記自動電圧調整手段から界磁電流を一定に制御する界磁電流一定制御手段へ運転を切替えることを特徴とする。 In order to achieve the above object, the generator excitation method of the present invention receives the secondary voltage of an instrument transformer that detects the output voltage of the generator connected to the system via the main circuit breaker. In addition, by the automatic voltage adjusting means to which the detection current in the instrument current transformer for detecting the field current of the generator is input, the secondary voltage of the instrument transformer and the detection in the instrument current transformer are detected. In a generator excitation method for controlling a field current of the generator based on an input value of a current, a field current If which is a detected current of the instrument current transformer and a preset threshold value If 1 are determined as a field. In addition to comparing with the current comparator, the generator voltage Vg from the instrument transformer and the preset threshold value Vg 1 are compared with the generator voltage comparator, and the field current If is preset. in threshold the If 1 or more, and, the generator voltage Vg is previously set To diagnose the abnormality in the threshold Vg 1 the following conditions, the field current constant control means for controlling the or or the automatic voltage regulating means blocking the field current of the generator field current constant It is characterized by switching operation.

本発明によれば、発電機の主機器が損傷に至ることはないし、界磁巻線が焼損することのない発電機励磁装置及び発電機励磁方法を得ることができる。   According to the present invention, it is possible to obtain a generator excitation device and a generator excitation method in which the main device of the generator is not damaged and the field winding is not burned out.

従来の発電機励磁装置を適用した発電機の励磁装置の全体構成を示し、自励電源方式の例である。1 shows an overall configuration of a generator excitation device to which a conventional generator excitation device is applied, and is an example of a self-excited power supply system. 本発明の発電機励磁装置の実施例1を適用した発電機の励磁装置の全体構成を示し、自励電源方式の例である。1 shows an overall configuration of a generator excitation device to which a generator excitation device according to Embodiment 1 of the present invention is applied, and is an example of a self-excited power supply system. 本発明の発電機励磁装置の実施例1の改良案を適用した発電機の励磁装置の全体構成を示し、自励電源方式の例である。1 shows an overall configuration of a generator excitation device to which an improvement of the first embodiment of the generator excitation device of the present invention is applied, and is an example of a self-excited power supply system. 本発明の発電機励磁装置の実施例1を適用した発電機の励磁装置の全体構成を示し、他励電源方式の例である。1 shows an overall configuration of a generator excitation device to which a first embodiment of a generator excitation device of the present invention is applied, and is an example of a separately excited power supply system. 本発明の発電機励磁装置の実施例2を適用した発電機の励磁装置の全体構成を示し、自励電源方式の例である。The whole structure of the generator excitation apparatus to which Example 2 of the generator excitation apparatus of the present invention is applied is shown, and is an example of a self-excited power supply system. 本発明の発電機励磁装置の実施例2を適用した発電機の励磁装置の全体構成を示し、他励電源方式の例である。The whole structure of the generator excitation apparatus to which Example 2 of the generator excitation apparatus of the present invention is applied is shown, and is an example of a separately excited power supply system.

以下、図示した実施例に基づいて本発明の発電機励磁装置を説明する。尚、符号は、従来と同一のものは同符号を使用し、その詳細説明は省略する。   Hereinafter, the generator excitation apparatus of the present invention will be described based on the illustrated embodiments. In addition, the code | symbol same as the past uses the same code | symbol, and abbreviate | omits the detailed description.

図2に、本発明の発電機励磁装置の実施例1を適用した発電機の励磁装置の全体構成を示し、自励電源方式のサイリスタ励磁装置における例であり、その概略構成は、図1と略同様である。   FIG. 2 shows an overall configuration of a generator excitation device to which the generator excitation device according to the first embodiment of the present invention is applied, and is an example of a self-excited power source type thyristor excitation device. It is substantially the same.

該図に示す本実施例では、発電機励磁装置9の一要素として、計器用変流器11の検出電流である界磁電流Ifと予め設定されたしきい値Ifを比較する界磁電流比較器16と、計器用変圧器12からの発電機電圧Vgと予め設定されたしきい値Vgを比較する発電機電圧比較器17と、界磁電流比較器16での界磁電流Ifが予め設定されたしきい値If以上で、かつ、発電機電圧比較器17での出力電圧Vgが予め設定されたしきい値Vg以下の条件で異常と診断して、発電機1の界磁電流を遮断するか、或いはAVRからAERへの運転切替を指令する診断手段18とを備えているものである。 In the present embodiment shown in the drawing, as an element of the generator exciter 9, the field current for comparing the detection threshold If 1 which is set in advance with the field current If a current of current transformer 11 The comparator 16, the generator voltage comparator 17 that compares the generator voltage Vg from the instrument transformer 12 and a preset threshold value Vg 1 , and the field current If in the field current comparator 16 are An abnormality is diagnosed under the condition that the threshold value If 1 is equal to or higher than the preset threshold value If 1 and the output voltage Vg at the generator voltage comparator 17 is equal to or lower than the preset threshold value Vg 1 , and the field of the generator 1 is And a diagnostic means 18 for interrupting the magnetic current or instructing the operation switching from the AVR to the AER.

このような本実施例の構成とすることにより、計器用変流器11の検出電流である界磁電流Ifと予め設定されたしきい値Ifを界磁電流比較器16で比較すると共に、計器用変圧器12からの出力電圧Vgと予め設定されたしきい値Vgを発電機電圧比較器17で比較し、界磁電流Ifが予め設定されたしきい値If以上で、かつ、出力電圧Vgが予め設定されたしきい値Vg以下の条件で異常と診断装置18で診断し、この診断装置18からの指令に基づいて発電機1の界磁電流を遮断して発電機の運転を停止するか、或いはAVR10からAERへ運転を切替えることで、発電機1の運転を継続することができる。 By adopting such a configuration of the present embodiment, the field current If which is a detected current of the instrument current transformer 11 is compared with a preset threshold value If 1 by the field current comparator 16, and The output voltage Vg from the instrument transformer 12 and the preset threshold value Vg 1 are compared by the generator voltage comparator 17, the field current If is equal to or greater than the preset threshold value If 1 , and An abnormality is diagnosed by the diagnosis device 18 under the condition that the output voltage Vg is equal to or less than a preset threshold value Vg 1 , and the field current of the generator 1 is cut off based on a command from the diagnosis device 18 to The operation of the generator 1 can be continued by stopping the operation or switching the operation from the AVR 10 to the AER.

これにより、発電機電圧検出用PT回路13が正常に構成されていない場合、或いは発電機1が無回転状態で励磁電流が流れた場合に異常と診断できる。   Thereby, it can be diagnosed as abnormal when the generator voltage detection PT circuit 13 is not normally configured, or when the generator 1 is not rotating and the excitation current flows.

また、CT11により測定された発電機1の界磁電流の代わりに、図3に示す改良案の如く、界磁巻線4の手前に設置されているシャント抵抗5により測定された発電機1の界磁電流をIfとして診断することで、初励磁電源14から界磁巻線4に流れる界磁電流も併せて監視することができる。   Further, instead of the field current of the generator 1 measured by the CT 11, as shown in the improvement plan shown in FIG. 3, the generator 1 measured by the shunt resistance 5 installed in front of the field winding 4 is used. By diagnosing the field current as If, the field current flowing from the initial excitation power source 14 to the field winding 4 can also be monitored.

診断装置18で異常として診断した場合は、界磁電流を遮断して発電機の運転停止、もしくはAVRからAERへの運転切替を実行し発電機1の運転を継続することで、異常の影響を除外することができる。   If the diagnosis device 18 diagnoses an abnormality, the field current is interrupted and the generator operation is stopped, or the operation is switched from AVR to AER and the operation of the generator 1 is continued. Can be excluded.

従って、本実施例では、発電機電圧検出用PT回路13で発生した異常により発電機1が過電圧となり発電機1等の主機損傷に至ること、又は発電機1の無回転状態で界磁電流が流れるという異常により、界磁巻線4が焼損することを、未然に防ぐことができる。   Therefore, in this embodiment, the generator 1 is overvoltaged due to an abnormality that has occurred in the generator voltage detection PT circuit 13, or the main machine such as the generator 1 is damaged, or the field current is generated when the generator 1 is not rotating. It is possible to prevent the field winding 4 from being burned out due to an abnormality of flowing.

また、本実施例では、AVRにおいて、従来から取り込んでいる界磁電流と発電機電圧検出用PT13の信号を利用するため、引出型PTの位置検出を行うリミットスイッチ等の検出器の追加設置が不要という利点がある。   Further, in this embodiment, in the AVR, since the field current and the signal of the generator voltage detection PT 13 which have been taken in conventionally are used, an additional detector such as a limit switch for detecting the position of the extraction type PT is installed. There is an advantage that it is unnecessary.

更に、従来の60PTでは、複数PTの同時異常により全てのPT出力がゼロとなった場合には、PT出力に差が無いため異常と診断できないのに対し、本実施例では、界磁電流が供給されている状態でPT出力がゼロの場合に異常と診断するため、60PTと組み合わせることで、単体PT異常と複数PT異常の両方に対処可能となる。   Furthermore, in the conventional 60PT, when all PT outputs become zero due to simultaneous abnormality of a plurality of PTs, there is no difference in PT output, and thus it cannot be diagnosed as abnormal. Since the abnormality is diagnosed when the PT output is zero in the supplied state, it is possible to cope with both the single PT abnormality and the plural PT abnormality by combining with 60 PT.

図4は、上述した実施例1の発電機励磁装置を他励電源方式のサイリスタ励磁装置に適用した例を示すものであり、系統から直接励磁変圧器8に励磁電流を導いているもので、初励磁電源14、初励磁開閉器15が無い点以外は、実施例1の構成と同一である。   FIG. 4 shows an example in which the generator exciter of Example 1 described above is applied to a thyristor exciter of another excitation power source type, in which an excitation current is led directly from the system to the excitation transformer 8, The configuration is the same as that of the first embodiment except that the initial excitation power source 14 and the initial excitation switch 15 are not provided.

このような他励電源方式を用いても、その効果は上述した実施例1と同様である。   Even if such a separately excited power source system is used, the effect is the same as that of the first embodiment.

図5に、本発明の発電機励磁装置の実施例2を示し、自励電源方式のブラシレス励磁装置における例であり、その概略構成は、図2と略同様である。   FIG. 5 shows a second embodiment of the generator exciter of the present invention, which is an example of a self-excited power source type brushless exciter, and its schematic configuration is substantially the same as FIG.

該図に示す実施例では、励磁装置19を用いて発電機1を起動するようにしている点が、実施例1とは異なるものである。   The embodiment shown in the figure is different from the first embodiment in that the generator 1 is activated using the excitation device 19.

図6は、上述した実施例2の発電機励磁装置を他励電源方式のブラシレス励磁装置に適用した例を示すものである。   FIG. 6 shows an example in which the generator exciter of Example 2 described above is applied to a brushless exciter of a separate excitation power source system.

このような図5及び図6に示した自励及び他励電源方式のブラシレス励磁装置に適用しても、実施例1と同様な効果を得ることができる。   Even when applied to the self-excited and separately-excited power source type brushless exciter shown in FIGS. 5 and 6, the same effects as those of the first embodiment can be obtained.

尚、上述した実施例1及び2では、異常と診断したら発電機の界磁電流を遮断するか、若しくはAVRからAERへ運転を切り替えることで、発電機を保護する例について説明したが、発電機を保護する方法としては、界磁遮断器6により遮断する他、サイリスタをゲートシフト、即ち、サイリスタ点孤位相角を最大に設定し、サイリスタからの界磁電流出力を最小限に絞ることでも可能である。   In the first and second embodiments described above, the example in which the generator is protected by shutting off the field current of the generator or switching the operation from the AVR to the AER when the abnormality is diagnosed has been described. In addition to blocking by the field breaker 6, the thyristor can be gate-shifted, that is, the thyristor point arc angle can be set to the maximum and the field current output from the thyristor can be minimized. It is.

1…発電機、2…主遮断器、3…送電線、4…界磁巻線、5…シャント抵抗、6…界磁遮断器、7…サイリスタ整流器、8…励磁変圧器、9…発電機励磁装置、10…自動電圧調整装置、11…計器用変流器、12…計器用変圧器、13…発電機電圧検出用PT回路、14…初励磁電源、15…初励磁開閉器、16…界磁電流比較器、17…発電機電圧比較器、18…診断装置、19…励磁装置。   DESCRIPTION OF SYMBOLS 1 ... Generator, 2 ... Main circuit breaker, 3 ... Transmission line, 4 ... Field winding, 5 ... Shunt resistance, 6 ... Field breaker, 7 ... Thyristor rectifier, 8 ... Excitation transformer, 9 ... Generator Excitation device, 10 ... automatic voltage regulator, 11 ... instrument current transformer, 12 ... instrument transformer, 13 ... generator voltage detection PT circuit, 14 ... initial excitation power source, 15 ... initial excitation switch, 16 ... Field current comparator, 17 ... generator voltage comparator, 18 ... diagnostic device, 19 ... excitation device.

Claims (9)

主遮断器を介して系統に接続される発電機の出力電圧を検出する計器用変圧器の二次電圧が入力されると共に、前記発電機の界磁電流を検出する計器用変流器での検出電流が入力され、これら両者の入力値に基づき前記発電機の界磁電流を制御する自動電圧調整手段及び界磁電流を一定に制御する界磁電流一定制御手段を備えた発電機励磁装置において、
前記発電機励磁装置は、前記計器用変流器の検出電流である界磁電流Ifと予め設定されたしきい値Ifを比較する界磁電流比較器と、前記計器用変圧器からの発電機電圧Vgと予め設定されたしきい値Vgを比較する発電機電圧比較器と、前記界磁電流比較器での界磁電流Ifが予め設定されたしきい値If以上で、かつ、前記発電機電圧比較器での発電機電圧Vgが予め設定されたしきい値Vg以下の条件で異常と診断して、前記発電機の界磁電流を遮断するか若しくは前記自動電圧調整手段から前記界磁電流一定制御手段への運転切替を指令する診断手段とを備えていることを特徴とする発電機励磁装置。
The secondary voltage of the instrument transformer that detects the output voltage of the generator connected to the system via the main circuit breaker is input, and at the instrument current transformer that detects the field current of the generator In a generator exciter comprising an automatic voltage adjusting means for controlling a field current of the generator based on input values of both detected currents and a field current constant control means for controlling the field current to be constant ,
The generator exciter includes a field current comparator that compares a field current If that is a detected current of the instrument current transformer and a preset threshold value If 1, and power generation from the instrument transformer. a generator voltage comparator for comparing the threshold value Vg 1 set in advance and the machine voltage Vg, in the field current If in the field current comparator preset threshold If 1 or more, The generator voltage Vg in the generator voltage comparator is diagnosed as abnormal under the condition of a preset threshold value Vg 1 or less, and the field current of the generator is cut off or from the automatic voltage adjusting means A generator exciter comprising: diagnostic means for commanding operation switching to the field current constant control means.
主遮断器を介して系統に接続される発電機の出力電圧を検出する計器用変圧器の二次電圧が入力されると共に、前記発電機手前に配置されたシャント抵抗からの検出電流が入力され、これら両者の入力値に基づき前記発電機の界磁電流を制御する自動電圧調整手段及び界磁電流を一定に制御する界磁電流一定制御手段を備えた発電機励磁装置において、
前記発電機励磁装置は、前記シャント抵抗からの検出電流である界磁電流Ifと予め設定されたしきい値Ifを比較する界磁電流比較器と、前記計器用変圧器からの出力電圧Vgと予め設定されたしきい値Vgを比較する発電機電圧比較器と、前記界磁電流比較器での界磁電流Ifが予め設定されたしきい値If以上で、かつ、前記発電機電圧比較器での出力電圧Vgが予め設定されたしきい値Vg以下の条件で異常と診断して、前記発電機の界磁電流を遮断するか若しくは界磁電流一定制御への切替えを指令する診断手段とを備えていることを特徴とする発電機励磁装置。
The secondary voltage of the instrument transformer that detects the output voltage of the generator connected to the system via the main circuit breaker is input, and the detection current from the shunt resistor arranged in front of the generator is input. In addition, in the generator excitation device provided with the automatic voltage adjusting means for controlling the field current of the generator based on the input values of both of these and the field current constant control means for controlling the field current to be constant,
The generator excitation device includes a field current comparator for comparing the threshold If 1 wherein preset as a detection current is field current If from the shunt resistor, the output voltage Vg from the voltage transformer When in advance and the generator voltage comparator for comparing the set threshold Vg 1, field current If in the field current comparator preset threshold If 1 or more, and the generator The output voltage Vg from the voltage comparator is diagnosed as abnormal under a condition that the preset threshold value Vg is 1 or less, and the field current of the generator is cut off or switching to constant field current control is commanded A generator excitation device, comprising:
請求項1又は2に記載の発電機励磁装置において、
前記発電機は、自励若しくは他励電源方式のサイリスタ励磁発電機であることを特徴とする発電機励磁装置。
The generator excitation device according to claim 1 or 2,
The generator is a self-excited or separately excited power source type thyristor excitation generator.
請求項1又は2に記載の発電機励磁装置において、
前記発電機は、自励若しくは他励電源方式のブラシレス励磁発電機であることを特徴とする発電機励磁装置。
The generator excitation device according to claim 1 or 2,
The generator is a self-excited or separately excited power source type brushless excitation generator.
主遮断器を介して系統に接続される発電機の出力電圧を検出する計器用変圧器の二次電圧が入力されると共に、前記発電機の界磁電流を検出する計器用変流器での検出電流が入力される自動電圧調整手段により、前記計器用変圧器の二次電圧及び前記計器用変流器での検出電流の入力値に基づき前記発電機の界磁電流を制御する発電機励磁方法において、
前記計器用変流器の検出電流である界磁電流Ifと予め設定されたしきい値Ifを界磁電流比較器で比較すると共に、前記計器用変圧器からの発電機電圧Vgと予め設定されたしきい値Vgを発電機電圧比較器で比較し、前記界磁電流Ifが予め設定されたしきい値If以上で、かつ、前記出力電圧Vgが予め設定されたしきい値Vg以下の条件で異常と診断して、前記発電機の界磁電流を遮断するか若しくは前記自動電圧調整手段から界磁電流を一定に制御する界磁電流一定制御手段へ運転を切替えることを特徴とする発電機励磁方法。
The secondary voltage of the instrument transformer that detects the output voltage of the generator connected to the system via the main circuit breaker is input, and at the instrument current transformer that detects the field current of the generator Generator excitation for controlling the field current of the generator based on the secondary voltage of the instrument transformer and the input value of the detected current at the instrument current transformer by means of automatic voltage adjustment means to which the detected current is input In the method
The field current If which is a detected current of the instrument current transformer and a preset threshold value If 1 are compared by a field current comparator, and the generator voltage Vg from the instrument transformer is preset. The generated threshold value Vg 1 is compared by a generator voltage comparator, the field current If is equal to or higher than a preset threshold value If 1 , and the output voltage Vg is set to a preset threshold value Vg. An abnormality is diagnosed under a condition of 1 or less, and the field current of the generator is cut off, or the operation is switched from the automatic voltage adjusting means to a field current constant control means for controlling the field current constant. The generator excitation method.
自励電源方式のサイリスタ励磁発電機の界磁電流をシャント抵抗を用いて検出することで、発電機無回転状態で発電機励磁装置を起動した場合に、初励磁電源から界磁巻線に界磁電流が流れ、発電機無回転のため発電機電圧はゼロで変化せず、発電機界磁電流Ifが予め設定されたしきい値If以上で、かつ、計器用変圧器からの出力電圧Vgが予め定められたしきい値Vg以下となることをもって異常と診断し、前記界磁電流を遮断するか若しくは界磁電流一定制御への切替えを行うことを特徴とする発電機励磁方法。 By detecting the field current of a self-excited thyristor-excited generator using a shunt resistor, when the generator exciter is started in the non-rotating state of the generator, the field is applied from the initial excitation power source to the field winding. Since the magnetic current flows and the generator does not rotate, the generator voltage does not change at zero, the generator field current If is greater than or equal to a preset threshold value If 1 , and the output voltage from the instrument transformer A generator excitation method characterized by diagnosing an abnormality when Vg becomes equal to or less than a predetermined threshold value Vg 1 and interrupting the field current or switching to constant field current control. 他励電源方式のサイリスタ励磁発電機の界磁電流を、計器用変流器若しくはシャント抵抗を用いて検出することで、発電機無回転状態で発電機励磁装置を起動した場合に、他励電源より最大出力の界磁電流が流れ、発電機無回転のため発電機電圧はゼロで変化せず、発電機界磁電流Ifが予め設定されたしきい値If以上で、かつ、計器用変圧器からの出力電圧Vgが予め定められたしきい値Vg以下となることをもって異常と診断し、前記界磁電流を遮断するか若しくは界磁電流一定制御への切替えを行うことを特徴とする発電機励磁方法。 By detecting the field current of a separately-excited power supply type thyristor-excited generator using a current transformer or shunt resistor, the separately-excited power supply The maximum output field current flows, the generator voltage does not change because the generator does not rotate, the generator field current If is greater than or equal to the preset threshold value If 1 , and the instrument transformer An abnormality is diagnosed when the output voltage Vg from the detector becomes a predetermined threshold value Vg 1 or less, and the field current is cut off or switched to constant field current control. Generator excitation method. 自励電源方式のブラシレス励磁発電機が、発電機無回転状態で発電機励磁装置を起動した場合に、発電機電圧検出値がゼロであるため、初励磁電源から界磁巻線に界磁電流が流れ、発電機無回転のため発電機電圧はゼロで変化せず、発電機界磁電流Ifが予め設定されたしきい値If以上で、かつ、計器用変圧器からの出力電圧Vgが予め定められたしきい値Vg以下となることをもって異常と診断し、前記界磁電流を遮断するか若しくは界磁電流一定制御への切替えを行うことを特徴とする発電機励磁方法。 When the self-excited power source brushless excitation generator starts the generator excitation device in the non-rotating state of the generator, the generator voltage detection value is zero, so the field current from the initial excitation power source to the field winding Since the generator does not rotate, the generator voltage does not change at zero, the generator field current If is greater than or equal to the preset threshold value If 1 , and the output voltage Vg from the instrument transformer is A generator excitation method characterized by diagnosing an abnormality when the threshold value Vg is equal to or less than a predetermined threshold Vg 1 and interrupting the field current or switching to constant field current control. 他励電源方式のブラシレス励磁発電機が、発電機無回転状態で発電機励磁装置を起動した場合に、発電機電圧検出値がゼロであるため他励電源より最大出力の界磁電流が流れるが、発電機無回転のため発電機電圧はゼロで変化せず、発電機界磁電流Ifが予め設定されたしきい値If以上で、かつ、計器用変圧器からの出力電圧Vgが予め定められたしきい値Vg以下となることをもって異常と診断し、前記界磁電流を遮断するか若しくは界磁電流一定制御への切替えを行うことを特徴とする発電機励磁方法。 When a separately excited power source type brushless excitation generator starts the generator excitation device in the non-rotating state of the generator, the generator voltage detection value is zero, so the maximum output field current flows from the separately excited power source. Because the generator does not rotate, the generator voltage does not change at zero, the generator field current If is greater than or equal to a preset threshold value If 1 , and the output voltage Vg from the instrument transformer is predetermined. A generator excitation method characterized by diagnosing an abnormality when the threshold value Vg becomes equal to or less than 1, and cutting off the field current or switching to constant field current control.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112630584A (en) * 2020-11-02 2021-04-09 安徽安庆皖江发电有限责任公司 Generator end abnormity monitoring system and method and electronic equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112630584A (en) * 2020-11-02 2021-04-09 安徽安庆皖江发电有限责任公司 Generator end abnormity monitoring system and method and electronic equipment
CN112630584B (en) * 2020-11-02 2023-10-20 国能神皖安庆发电有限责任公司 Generator terminal abnormality monitoring system and method and electronic equipment

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