JPH0819231A - Detector for failure of rectifier of rotating converter - Google Patents

Abstract

PURPOSE:To detect the failure of rectifies of a rotating converter in operation and identify the defective rectifier for restoration by a method wherein the wavelength of a light emitted by a light emitting diode is identified by the detection signal of the light emitting diode and it is decided which one of a plurality of rectifiers is failed. CONSTITUTION:A rectifier 15 is connected to a fuse 16 in series. A light emitting diode 18 is connected to a resistor 17 which has a resistance several times - several hundreds times as large as the resistance of the fuse 16 in series and this series circuit is connected in parallel with the fuse 16. A commutator 13 is composed of a plurality of such series-parallel circuit units which are connected in parallel with each other. The light emitting diodes 18 have different colors. If an abnormal power is applied to the converter 13, the fuse 16 is flown out and a current is applied to the light emitting diode 18 through the resistor 17 and the specific light emitting diode 18 in the unit containing the rectifier 15 emits a light with its proper wavelength. By identifying the proper wavelength of the specific light emitting diode 18, it is decided which rectifier is failed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure detecting device for a rectifying element which constitutes a rotary rectifier used in a brushless excitation type generator.

[0002]

2. Description of the Related Art DC excitation systems for synchronous generators are roughly classified into brush type excitation systems and brushless excitation systems. In the former, DC is supplied to the rotor side from a brush provided on the stator side of the generator via a slip ring provided on the rotor side for excitation. This brush-type excitation method is further subdivided into separate power supply method, direct connection excitation method, and self-excitation method. All of them have a brush, which causes abrasion resistance or abrasion powder at the contact portion where the brush is provided. There was a problem such as corona discharge.

The latter is a brushless excitation method that solves these problems. This brushless excitation method
A rotating armature-type AC exciter directly connected to the rotor of the main generator for performing the original power generation is provided, and the output here is converted to DC through a rectifier composed of a diode or the like on the rotor side. Then, the DC power supply obtained here is used as the excitation source of the main generator. Since this brushless excitation method is combined with the rotor of the main generator and the alternating current exciter that is a rotating armature type AC generator, the circuit time constant becomes longer than that of the brush type excitation method, and the external system accident Since it is not easily affected and does not have a brush and is excellent in maintainability, it is often used in small and medium capacity generators such as geothermal power plants that do not have resident monitoring staff.

As described above, in the brushless excitation type generator, the rotary rectifier is installed on the rotor side of the main generator in order to rectify the output from the AC exciter which is the excitation source of the main generator. Here, if the rotary rectifier provided on the rotor side fails, there is no brush in the generator field circuit and
Since the rotary rectifier rotates at the same speed as the generator, it is very difficult to detect the failure of the rotary rectifier.

That is, generally, a fuse with a light emitting diode is connected in series with a rectifying element which constitutes a rotary rectifier, and when the fuse is blown due to a short circuit failure of the rectifying element, the light emitting diode is driven by a power supply of a field circuit. Light up. This method allows maintenance personnel to detect failures by visually inspecting the equipment.

[0006]

However, according to the conventional method, when the rotary rectifier provided on the rotor side of the main generator is rotating at the same speed as the generator, a large number of rotary rectifiers are formed. There is a problem in that it is impossible to determine which of the rectifying elements of the above is defective. Further, since the light emitting diode emits light by the power source of the field circuit, the power source is lost when the generator stops. For this reason, the light emitting diode cannot emit light, and it becomes impossible to determine which rectifying element has failed.

For this reason, conventionally, after the generator is stopped, it is necessary to inspect whether or not a large number of rotary rectifying elements have been removed one by one, and to identify the defective rectifying element. It was uneconomical in terms of workability.

Further, in many geothermal power plants and hydroelectric power plants, a remote control method is adopted in which a monitoring facility in which an operator is stationed is installed in a place distant from the power plant, and the power plant is operated and monitored unattended. There is. In this case, since the operator is not resident, it is impossible to confirm the failure of the rotary rectifier by the light emitting diode which has been conventionally used.

Therefore, it is an object of the present invention to detect a faulty rectifying element of a rotary rectifier during operation of a rotary electric machine and to specify a faulty rectifying element even when the rotary electric machine is stopped due to restoration. To obtain a rectifying element failure detection device for a rotary rectifier.

[0010]

SUMMARY OF THE INVENTION A rectifying element failure detecting device for a rotary rectifier according to the present invention is connected to a rectifying element constituting a rotary rectifier in series and is blown when a voltage exceeding an rated voltage from an AC exciter is applied. Fuse, a resistor connected in parallel with the fuse and having a resistance value larger than the resistance value of the fuse, a light-emitting diode connected in series with the resistor and emitting light when the fuse is blown, and light of the light-emitting diode. Any of a photodetector that detects on the stator side, a color identification device that identifies the wavelength of light based on the signal detected by this photodetector, and a rectifying element that is provided with a plurality of signals of this color identification device. It is characterized in that it is provided with a position discriminating device for discriminating whether or not there is a failure.

Further, the rectifying element failure detecting device for a rotary rectifier of the present invention comprises a fuse connected in series with a rectifying element constituting the rotary rectifier, which fuses when the voltage exceeds the rated voltage from the AC exciter. A resistor connected in parallel with the fuse and having a resistance value greater than that of the fuse, a light emitting diode connected in series with the resistor and emitting light when the fuse is blown, and a capacitor connected in parallel with the light emitting diode. , A light detector that detects the light of the light emitting diode on the side of the stator, a color identification device that identifies the wavelength of the light based on the signal detected by this light detector, and a plurality of signals provided by this color identification device are input. And a position discriminating device for discriminating which one of the rectifying elements has failed.

The rectifying element failure detection device for a rotary rectifier according to the present invention further includes a fuse connected in series with the rectifying element constituting the rotary rectifier, which fuses when the voltage exceeds the rated voltage from the AC exciter. A resistor which is connected in parallel with the fuse and has a resistance value larger than that of the fuse, a code converter which is connected in parallel with the resistor and the fuse, and a light source which emits light by a power source having a light emission pattern from the code converter. A diode, a photodetector for detecting the light of the light emitting diode on the side of the stator, a code signal input section for inputting a signal detected by the photodetector, and a light emitting pattern of the code converter are stored as data in advance. Comparison judgment between the unique data signal database and the output from this unique data signal database and the signal detected by the photo detector And fault rectification element determination unit that, characterized in that and a warning output unit for outputting a signal determined by the failure rectifying element determining unit.

The rectifying element failure detecting device for a rotary rectifier according to the present invention comprises a fuse connected in series with the rectifying element constituting the rotary rectifier and blown when the voltage exceeds the rated voltage from the AC exciter. A resistor which is connected in parallel with the fuse and has a resistance value larger than that of the fuse, an image pattern converter which is connected in parallel with the resistor and the fuse, and a light emitting diode which emits light by a power source from the image pattern converter. , An image detector that detects the light of the light emitting diode as an optical image on the side of the stator, an image signal input unit that inputs the image signal detected by the image detector, and an image pattern of the image pattern converter in advance. The unique image pattern database that is stored as an image and the output from this unique image pattern database and the image detector And a comparison determining fault rectification element determination unit a signal, characterized in that and a warning output unit for outputting a signal determined by the failure rectifying element determining unit.

A rectifying element failure detection device for a rotary rectifier according to the present invention comprises a photodetector provided on the stator side of a rotating electric machine for detecting the presence or absence of light emission of a light emitting diode, and a rotary shaft based on the output of this photodetector. A sync signal input section for inputting a sync signal that defines the phase reference for the, and a search coil provided on the stator side for detecting the magnetic flux due to the energization of the fuse;
Based on the output from this search coil, the waveform input section that inputs the waveform of the magnetic flux due to the energization of the fuse, and the pulse-free section due to the blowout of the fuse based on the output from this waveform input section and the output from the synchronization signal input section It is characterized in that it is provided with a pulseless detector for detecting and discriminating the failed rectifying element, and an alarm device for outputting the discrimination result from the pulseless detector.

[0015]

A rectifying element failure detection device for a rotary rectifier according to the present invention is a fuse connected to a rectifying element constituting a rotary rectifier in series and blown when a voltage exceeding the rated voltage from an AC exciter is applied. Includes a resistor connected in parallel with a resistance value greater than that of the fuse, and a rectifying element that is connected in series with this resistor and that has a light-emitting diode that emits light when the fuse is blown, thereby causing a failure on the rotor side. A color identification device for identifying the wavelength of the emitted light by a signal detected by a photodetector which detects the light of the light emitting diode on the stator side by making the light emitting diode connected to the unit emit light, and the color identification device of this color identification device. Since a position determining device that inputs a signal and determines which one of a plurality of rectifying elements has a failure is provided, the rectifying elements are not damaged even during operation of the rotating electric machine. It is possible to detect.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. FIG. 1 is a configuration diagram of a rotary rectifier that constitutes a rectifying element failure detection device for a rotary rectifier according to an embodiment of the present invention. The AC exciter 11 is directly connected to the rotary shaft of the synchronous generator, and receives the excitation from the stator side of the synchronous generator, and is a rotary rectifier provided on the rotor side of the synchronous generator.
Supply AC output to 12. The rotary rectifier 12 is provided with a three-phase rectifier bridge circuit using a rectifier 13 composed of a diode or the like, and is a connection for connecting the output from the AC exciter 11 to DC and then connecting it to the rotor of the synchronous generator. A DC excitation source is supplied to the rotor via the terminal 14.

FIG. 2 is an enlarged circuit diagram of the single commutator 13 shown in FIG. The commutator 13 is formed by connecting a rectifying element 15 and a fuse 16 in series, and is connected in parallel with the fuse 16 and in series with a resistor 17 having a resistance value several times to several hundred times higher than the resistance value of the fuse 16. A plurality of the connected light emitting diodes 18 are connected as one unit and are connected in parallel. Further, the plurality of light emitting diodes 18 provided each have a different color arrangement.

Therefore, the commutator 13 during normal operation of the rotary electric machine
In, since the resistance value of the fuse 16 is smaller than the resistance value of the resistor 17, a current hardly flows to the resistor 17-light emitting diode 18 and flows in the path of the rectifying element 15-fuse 16 so that the light emitting diode 18 It does not emit light.

Now, it is assumed that abnormal power deviating from the rated power is applied to the commutator 13 due to the failure of the rectifying element 15. At this time, if this abnormal power is applied in the forward direction of the rectifying element 15 and an abnormal voltage is applied and the fuse 16 is blown,
A current flows through the light emitting diode 18 via 17, and since the light emitting diode 18 has a different color scheme, it is possible to emit light of a specific wavelength of the specific light emitting diode 18 in the unit including the failed commutator 15. Become.

FIG. 3 is a conceptual diagram showing the detection process on the stator side of the rectifying device detecting device of the rotary rectifier according to the embodiment of the present invention. A commutator that constitutes a rotary rectifier 12 provided at the rotor end of the rotating electric machine on the stator side.
A color identification device that includes a photodetector 19 for detecting the light of a light emitting diode 18 connected to 13, and identifies the specific wavelength of the specific light emitting diode 18 based on the output from the photodetector 19.
Equipped with 20. The position identification device 21 is provided which determines which of the plurality of light emitting diodes 18 provided by the output from the color identification device 20 emits light, and which of the rectifying elements 15 provided is defective. .

That is, the photodetector 19 detects the light of the specific light emitting diode 18 and outputs the specific wavelength thereof as a signal to a specific wavelength input section (not shown) provided in the color identification device 20. In addition, the color identification device 20 has a characteristic wavelength storage unit (not shown), in which each characteristic wavelength of the plurality of rotor-side light emitting diodes 18 stored in advance is stored as data. Then, the signal from the unique wavelength storage unit and the signal from the unique wavelength input unit are sequentially output to the position discriminating apparatus 21. The position discriminating device 21 discriminates the failed rectifying element 15 by inputting and comparing these signals and discriminating the characteristic wavelength of the signal from the characteristic wavelength input section.

With such a configuration, it is possible to detect a failure of the rectifying element that constitutes the rotary rectifier 12 on the rotor side even during operation of the rotating electric machine, and to identify the failed rectifying element. Therefore, the recovery work can be significantly reduced, the construction period can be shortened, and the burden on the worker can be reduced.

Further, the mounting position of the light emitting diode mounted on the rotary rectifier mounting disk 22 is changed in the generator rotation axis direction or the radial direction, and the mounting positions and the number of the photodetectors 19 are appropriately arranged. Even with such a configuration, it is possible to identify the failed rectifying element in the same manner and reduce the number of colors of light emitted from the light emitting diode.

A second embodiment of the present invention will be described below with reference to FIGS. 1, 3 and 4. FIG. 1 is a configuration diagram of a rotary rectifier that constitutes a rectifying element failure detection device for a rotary rectifier according to an embodiment of the present invention. The AC exciter 11 is directly connected to the rotary shaft of the synchronous generator, receives excitation from the stator side of the synchronous generator, and supplies AC output to the rotary rectifier 12 provided on the rotor side of the synchronous generator. To do. In the rotary rectifier 12,
A three-phase rectifier bridge circuit with a rectifier 13 composed of a diode is provided, and after converting the output from the AC exciter 11 into DC, a connection terminal for connecting to the rotor of the synchronous generator.
A DC excitation source is supplied to the rotor via 14.

FIG. 4 is an enlarged circuit diagram of the single commutator 13 shown in FIG. The commutator 13 is a light-emitting diode 18, in which a rectifying element 15 and a fuse 16 are connected in series, in parallel with the fuse 16, and in series with a resistor 17 having a resistance value larger than that of the fuse 16. Also, a plurality of capacitors are connected in parallel with one unit including a capacitor 23 connected in parallel with the light emitting diode 18. Also, a plurality of light emitting diodes 18 are provided.
Emit light in different colors.

Therefore, normally, due to the resistance value of the resistor 17, almost no current flows through the resistor 17-light emitting diode 18, but through the path consisting of the rectifying element 15-fuse 16. Now, it is assumed that abnormal power deviating from the rated power is applied to the commutator 13 due to the failure of the rectifying element 15. At this time, when this abnormal power is applied in the forward direction of the rectifying element 15 and an abnormal voltage is applied and the fuse 16 is blown, current flows only to the light emitting diode 18 via the resistor 17, and the specific light emitting diode 18 is identified. The color emits light. Then, by stopping the rotating electric machine, the light emitting diode 18 can continue to emit light by the power supply from the capacitor 23 even when the power from the AC exciter is cut off.

FIG. 3 is a conceptual diagram showing the detection process on the stator side of the rotary rectifying element detecting device according to one embodiment of the present invention. On the stator side, a photodetector 19 for detecting the above-mentioned light from the commutator 13 that constitutes the rotary rectifier 12 provided at the rotor end of the rotating electric machine is provided, and is obtained by this photodetector 19. A color identification device (20) for identifying the emission color of the light emitting diode (18) by inputting the light of the light emitting diode (18). The output from the color identification device 20 determines which of the plurality of light emitting diodes 18 emits light, and thus the plurality of rectifying elements 15 provided.
A position discriminating device 21 for discriminating which one has failed.

With such a configuration, it is possible to detect a failure of the rectifying element forming the rotary rectifier 12 on the rotor side even when the rotating electric machine is in operation or when the rotating electric machine is stopped. Furthermore, since the failed rectifying element can be identified, the restoration work can be significantly reduced, the construction period can be shortened, and the burden on the worker can be reduced.

Further, the mounting positions of the light emitting diodes mounted on the rotary rectifier mounting disk 22 are changed in the generator rotation axis direction or the radial direction, and the mounting positions and the number of the photodetectors 19 are appropriately arranged. Even with such a configuration, it is possible to identify the failed rectifying element in the same manner and reduce the number of colors of light emitted from the light emitting diode.

A third embodiment of the present invention will be described below with reference to FIGS. 1 and 5 to 7. FIG. 1 is a configuration diagram of a rotary rectifier that constitutes a rectifying element failure detection device for a rotary rectifier according to an embodiment of the present invention. The AC exciter 11 is directly connected to the rotary shaft of the synchronous generator, receives excitation from the stator side of the synchronous generator, and supplies AC output to the rotary rectifier 12 provided on the rotor side of the synchronous generator. To do. In the rotary rectifier 12,
A three-phase rectifier bridge circuit with a rectifier 13 composed of a diode is provided, and after converting the output from the AC exciter 11 into DC, a connection terminal for connecting to the rotor of the synchronous generator.
A DC excitation source is supplied to the rotor via 14.

FIG. 5 is an enlarged circuit diagram of the single commutator 13 shown in FIG. The rectifier 13 is composed of a rectifying element 15 and a fuse 16 connected in series, and a resistor 17 having a resistance value larger than that of the fuse 16 connected in parallel with the fuse 16 as one unit. It is configured to be connected in parallel. Also, fuses connected in parallel
Both ends of 16 and the resistor 17 are connected to the code converter 24.

Now, assume that abnormal power deviating from the rated power is applied to the commutator 13 due to the failure of the rectifying element 15. When this abnormal power is applied in the forward direction of the rectifying element 15 and an abnormal voltage is applied to blow the fuse 16, the current flowing through the code converter 24 via the resistor 17 and the terminals 104 and 110 increases. At the same time, the voltage applied across the resistor 17 and the code converter 24 changes, and this input changes the code converter.
At 24, the blowout of the fuse 16 is detected. Other rectifiers can be similarly detected by adopting the same configuration, whereby the commutator 13 including the defective rectifier 16 connected in series with the blown fuse 16 is further subdivided into terminals. This makes it possible to identify the rectifying element 16 that has failed.

FIG. 6 is an explanatory diagram showing the connection of the code converter according to the present invention and its periphery. In the code converter 24, the signal for blowing the fuse 16 is input through the input terminals 101 to 112 provided for each phase or rectifying element by the AC exciter,
The blown point of the fuse is specified, that is, the failure point of the rectifying element is specified. Furthermore, depending on the identified failure location,
The light emission pattern corresponding to this location is converted into a code signal having information for identifying the failure location based on previously provided data, and the encoded output is output to the light emitting diode 18 as a code signal.

For this reason, since the light emitting diode 18 is supplied with power including the code signal from the code converter 24, it emits light in a light emitting pattern including the code signal. Here, FIG. 7 is a conceptual diagram showing a detection process on the stator side of the rotary rectifying element detection device according to the embodiment of the present invention. On the stator side of the rotating electric machine, a photodetector 19 for detecting the above-mentioned light from the commutator 13 that constitutes the rotary rectifier provided at the rotor end is provided, and the code obtained by this photodetector 19 Light-emitting diode 18 that emits light including signals
The code signal input unit 25 for inputting the light signal is provided. Then, the output from the code signal input section and the output from the unique data signal database 26 having the unique data corresponding to the light emission pattern previously determined by the code converter 24 are compared and determined, and the rectifying element or the failure occurs. The faulty rectifying element determination unit 27 identifies the commutator including the rectifying element. Further, the alarm output unit 28, which inputs the signal from the faulty rectifying device determination unit 27, enables the operation supervisor of the power plant to know the fault of the rectifying device. As described above, the code converter 24 on the stator side of the rotating electric machine includes the code signal input unit 25, the unique data signal database 26, the failure rectifying element determination unit 27, and the alarm output unit 28.

With the above-mentioned structure, it is possible to detect the failure of the rectifying element constituting the rotary rectifier 12 on the rotor side even while the rotating electric machine is in operation or when the rotating electric machine is stopped. Further, since the failed rectifying element can be identified, the recovery work can be greatly reduced, the construction period can be shortened, and the workload of the worker can be reduced.

Further, the mounting positions of the light emitting diodes mounted on the rotary rectifier mounting disk 22 are converted in the generator rotation axis direction or the radial direction, and the mounting positions and the number of the photodetectors 19 are appropriately arranged. With such a configuration as well, it is possible to identify the failed rectifying element in the same manner and further reduce the number of light emission colors of the light emitting diode.

A fourth embodiment of the present invention will be described below with reference to FIGS.
This will be described with reference to FIGS. 8 and 9. FIG. 1 is a configuration diagram of a rotary rectifier that constitutes a rectifying element failure detection device for a rotary rectifier according to an embodiment of the present invention. The AC exciter 11 is directly connected to the rotary shaft of the synchronous generator, receives excitation from the stator side of the synchronous generator, and supplies AC output to the rotary rectifier 12 provided on the rotor side of the synchronous generator. To do. Rotary rectifier 12
Is equipped with a three-phase rectifier bridge circuit with a rectifier 13 made of a diode, and after converting the output from the AC exciter 11 to DC, it is connected via a connection terminal 14 for connecting to the rotor of the synchronous generator. Supply a DC excitation source to the rotor.

FIG. 5 is an enlarged circuit diagram of the single commutator 13 shown in FIG. The commutator 13 is composed of a rectifying element 15 and a fuse 16 connected in series, and a resistance 17 having a resistance value larger than that of the fuse 18 connected in parallel with the fuse 18 as one unit. It is configured to be connected in parallel. Also, fuses connected in parallel
Both ends of 16 and the resistor 17 are connected to the image pattern converter 29.

Now, it is assumed that abnormal power deviating from the rated power is applied to the commutator 13 due to the failure of the rectifying element 15. When this abnormal power is applied in the forward direction of the rectifying element 15 and an abnormal voltage is applied to blow the fuse 16, the current flowing through the image pattern converter 29 via the resistor 17 and the terminals 104 and 110 increases. At the same time, the voltage applied to both ends of the resistor 17 and the image pattern converter 29 changes, and this input causes the image pattern converter 29 to detect the fusing of the fuse 16. Other rectifiers can be similarly detected by adopting the same configuration, whereby the commutator 13 including the defective rectifier 16 connected in series with the blown fuse 16 is further subdivided into terminals. This makes it possible to identify the rectifying element 16 that has failed.

FIG. 8 is an explanatory view showing an image pattern converter according to the present invention and connections around the image pattern converter. In the image pattern converter 29, the input terminals 101 to 112 in which the signal for blowing the fuse 16 is provided for each phase by the AC exciter or for each rectifying element.
To specify the blown point of the fuse, that is, the failed point of the rectifying element. Further, according to the identified failure location, the light emission pattern corresponding to this location is converted into an image pattern signal having information for identifying the failure location based on the data provided in advance, and this signal is converted into a light emitting diode.
Output to 18.

Therefore, the light emitting diode 18 is supplied with power including the image pattern signal from the image pattern converter 29, and thus emits light in the light emitting pattern including the image pattern signal.

FIG. 9 is a conceptual diagram showing the detection process on the stator side of the rotary rectifying element detecting device according to the embodiment of the present invention. On the stator side of the rotating electric machine,
Commutator 13 that constitutes a rotary rectifier provided at the rotor end
From the image detector 30 for detecting the image by the light from
And an image signal input section 31 for inputting the image signal of the light emitting diode 18 which emits light including the image pattern signal obtained by the image detector 30. Then, the output from the image signal input unit 31 and the image pattern converter 29 in advance.
In comparison with the output from the unique image pattern database 32 having the unique data corresponding to the image pattern determined by, the failure rectifying element or the commutator including the failed rectifying element is specified by the failure rectifying element determination unit 27. To do. Also,
Alarm output unit that receives the signal from the fault rectifying device determination unit 27
28 makes it possible for the operation supervisor of the power plant to know the failure of the rectifying element. As described above, the image pattern converter 29 on the stator side of the rotating electric machine includes the image signal input unit 31, the unique image pattern database 32, the failure rectifying element determination unit 27, and the alarm output unit 28.

With the above configuration, it is possible to detect the failure of the rectifying element forming the rotary rectifier 12 on the rotor side during the operation of the rotating electric machine, and to identify the failed rectifying element. The restoration work can be greatly reduced, the construction period can be shortened, and the burden on workers can be reduced.

Further, the mounting positions of the light emitting diodes mounted on the rotary rectifier mounting disk 22 are changed in the generator rotation axis direction or the radial direction, and the mounting positions and the number of the image detectors 30 are appropriately arranged. Even with such a configuration, similarly, the failed rectifying element can be identified with high accuracy, and since signals are transmitted and received as an image pattern, the number of light emission colors of the light emitting diode can be further reduced.

A fifth embodiment of the present invention will be described below with reference to FIGS. 1 and 10 to 13. FIG. 1 is a configuration diagram of a rotary rectifier that constitutes a rectifying element failure detection device for a rotary rectifier according to an embodiment of the present invention. The AC exciter 11 is directly connected to the rotary shaft of the synchronous generator, receives excitation from the stator side of the synchronous generator, and supplies AC output to the rotary rectifier 12 provided on the rotor side of the synchronous generator. To do. In the rotary rectifier 12,
A three-phase rectifier bridge circuit with a rectifier 13 composed of a diode is provided, and after converting the output from the AC exciter 11 into DC, a connection terminal for connecting to the rotor of the synchronous generator.
A DC excitation source is supplied to the rotor via 14.

FIG. 10 is an enlarged circuit diagram of the one commutator 13 in FIG. 1, and FIG. 11 is a conceptual diagram showing the detection process on the stator side of the rotary rectifier detecting device according to one embodiment of the present invention. The commutator 13 provided on the rotor side of the rotating electric machine is a rectifying element.
15 and a fuse 16 connected in series, and in parallel with the fuse 16, a light emitting diode 18 connected in series with a resistor 17 having a resistance value larger than that of the fuse 16.
It is provided with a plurality of connected units as one unit. Then, for one unit of these, the position detection light emitting diode 33 that always emits light in series connection with the resistor 17 and the light emitting diode 18, and a resistor having a resistance value slightly larger than the resistance value of the fuse 16 are provided in series. 34 is connected in parallel.

Therefore, since the resistance value of the resistor 17 is set to be larger than the resistance value of the fuse 16 in the commutator 13 during the normal operation of the rotating electric machine, the current flowing through the commutator 13 is the resistor 17-the light emitting diode 18 Almost no current flows in the path of
The light emitting diode 18 does not emit light because it flows in the path of the rectifying element 15 and the fuse 16. Further, also in the unit having the position detecting light emitting diode 33, since the resistance value of the resistor 34 is set in the vicinity of the resistance value of the fuse 16 and smaller than the resistance value of the resistor 17, in the path of the resistor 17-light emitting diode 18. As a result, almost no current flows, and most of it flows through the path of the rectifying element 15-fuse 16 and part of it flows through the path of the resistor 34-position detecting light emitting diode 33. That is, the light emitting diode 18 does not emit light, but the position detecting light emitting diode 33 always emits light.

On the other hand, on the stator side of the rotating electric machine, there is provided a search coil 35 for detecting the magnetic flux due to the energization of the fuse 16 connected in series with the rectifying element on the rotor side. The magnetic flux waveform shown in 12 is obtained. That is, in the waveform input unit 35, the magnetic flux detected by the search coil 35 is obtained as a function of time, and the phase of the commutator 13 is set in advance uniformly with respect to the rotation axis of the rotor having a constant angular velocity. As a result, a magnetic flux waveform having a period T is obtained. Here, the maximum points of the magnetic flux obtained at the times t1, t2, ..., T5 ... Of course are not the magnetic flux due to the energization of one fuse, but the magnetic flux due to the energization of mutually different fuses installed in a continuous phase with respect to the rotating shaft. This is due to detection.

Further, the stator side has a commutator 13 on the rotor side.
Is provided with a photodetector 37 for detecting the light of the position detection light emitting diode 33 connected in parallel with the fuse 16 constituting
With this output, the synchronization signal input section 38 obtains an analysis synchronization pulse based on the synchronization signal of the rotating electric machine (not shown) in the same manner as the waveform input section 35. However, since this synchronizing pulse is for detecting the light from the position detecting light emitting diode 33,
The period is nT which is obtained by multiplying the number n of commutators provided in the rotor by the period T.

Now, it is assumed that abnormal power deviating from the rated power is applied to the commutator 13 due to the failure of the rectifying element 15. At this time, if this abnormal power is applied in the forward direction of the rectifying element 15 and an abnormal voltage is applied and the fuse 16 is blown,
A current flows through the light emitting diode 18 via 17, the light emitting diode 18 emits light, and the magnetic flux due to the energization of the fuse 16 disappears. For this reason, a commutator with this fuse
When 13 faces the search coil 35, the magnetic flux cannot be detected by the search coil 35.
A waveform including the non-pulse portion shown in 13 is obtained. This pulseless portion is detected by the pulseless detector 39 based on the output of the waveform input section 36 and the output of the synchronization signal input section 38.

That is, the pulse-free detection section 39 determines the reference time point by the synchronization pulse of the cycle nT obtained from the synchronization signal input section 38. Time parameters (t1, t2, ..., T) of the magnetic flux waveform obtained by the waveform input unit 36 based on this reference time point.
The magnetic flux waveform during normal operation corresponding to (5) is stored in a storage unit (not shown). Next, the magnetic flux waveform input by the waveform input unit 36 and the synchronization signal input unit 38 along with the operation of the rotating electric machine is compared with the magnetic flux waveform stored in the storage unit by a comparison determination unit (not shown). Here, when the non-pulse portion where the maximum value of the magnetic flux corresponding to the time parameter is not obtained for each cycle T is detected, the reference time point (t1 in FIG. 13) is detected.
And the time point (t2 in FIG. 13), the phase of the commutator 13 provided on the rotor and attached to the mounting disk 22 with respect to the rotation axis, and the angular velocity of the rotor. judge. Then, based on the output from the comparison / determination unit, the presence / absence of a failure of the rectifying element and the position of the failed commutator are output.
Output to 28, and the operator can confirm the failure of the rectifying device by the output of the alarm unit 28.

With such a configuration, it is possible to detect the failure of the rectifying element forming the rotary rectifier 12 on the rotor side even when the rotating electric machine is in operation, and to identify the failed rectifying element. Therefore, the recovery work can be significantly reduced, the construction period can be shortened, and the burden on the worker can be reduced.

Further, the mounting positions of the light emitting diodes mounted on the rotary rectifier mounting disc 22 are changed in the generator rotation axis direction or the radial direction, and the mounting positions and the number of the photodetectors 19 are appropriately arranged. Even with such a configuration, it is possible to identify the failed rectifying element in the same manner and reduce the number of colors of light emitted from the light emitting diode.

[0054]

【The invention's effect】 [Brief description of drawings]

FIG. 1 is a configuration diagram of a rotary rectifier that constitutes a rectifying element failure detection device for a rotary rectifier according to an embodiment of the present invention.

FIG. 2 is an enlarged circuit diagram of one commutator in FIG.

FIG. 3 is a conceptual diagram showing a detection process on a stator side of a rotary rectifying element detection device according to an embodiment of the present invention.

4 is an enlarged circuit diagram of one commutator in FIG.

5 is an enlarged circuit diagram of one commutator in FIG.

FIG. 6 is an explanatory diagram showing a code converter according to the present invention and connections around the code converter.

FIG. 7 is a conceptual diagram showing a detection process on the stator side of the rotary rectifying element detection device according to the embodiment of the present invention.

FIG. 8 is an explanatory diagram showing an image pattern converter according to the present invention and connections around the image pattern converter.

FIG. 9 is a conceptual diagram showing a detection process on the stator side of the rotary rectifying element detection device according to the embodiment of the present invention.

10 is an enlarged circuit diagram of one commutator 13 in FIG.

FIG. 11 is a conceptual diagram showing a detection process on the stator side of the rotary rectifying element detection device according to the embodiment of the present invention.

FIG. 12 is a magnetic flux waveform diagram by the search coil when the rotary rectifier is normal.

FIG. 13 is a magnetic flux waveform diagram when the fuse is blown by application of an abnormal voltage to the rotary rectifier.

[Explanation of symbols]

11 ... AC exciter, 12 ... Rotary rectifier, 13 ... Commutator, 14 ... Connection terminal, 15 ... Rectifier element, 16 ... Fuse, 17 ... Resistor, 18 ...
Light emitting diode, 19 ... Photo detector, 20 ... Color identification device, 21 ...
Position discriminating device, 22 ... Mounting disc, 23 ... Capacitor, 24 ... Code converter, 25 ... Code signal input section, 26 ... Unique data signal database, 27 ... Fault rectifying element determination section, 28 ... Alarm output section, 29 ... Image pattern converter, 30 ... Image detector, 31 ...
Image signal input unit, 32 ... Unique image pattern database,
33 ... Position detecting light emitting diode, 34 ... Resistor, 35 ... Search coil, 36 ... Waveform input section, 37 ... Photodetector, 38 ... Sync signal input section, 39 ... No pulse detection section.

Claims (5)

[Claims] 1. An AC exciter which is directly connected to a rotary shaft of a synchronous generator and supplies an exciting power source for the rotor of the synchronous generator to the rotor without contacting the stator side of the synchronous generator. The rated voltage from the AC exciter connected in series with a rectifying element that forms a rotary rectifier that inputs the AC power source obtained by A fuse that is blown when the voltage is exceeded, a resistor that is connected in parallel with the fuse and has a resistance value greater than that of the fuse, and light is emitted when the fuse is connected in series and the fuse is blown. Light emitting diode, a light detector for detecting the light of the light emitting diode on the side of the stator, a color identification device for identifying the wavelength of the light based on a signal detected by the light detector, and a color identification device. And a position discriminating device which discriminates which one of a plurality of the rectifying devices is faulty by inputting a signal of the rectifying device, and a rectifying device fault detecting device for a rotary rectifier. 2. An alternating current exciter which is directly connected to a rotary shaft of a synchronous generator and supplies the exciting power of the rotor of the synchronous generator to the rotor without contacting the stator side of the synchronous generator. The rated voltage from the AC exciter connected in series with a rectifying element that forms a rotary rectifier that inputs the AC power source obtained by A fuse that is blown when the voltage is exceeded, a resistor that is connected in parallel with the fuse and has a resistance value greater than that of the fuse, and light is emitted when the fuse is connected in series and the fuse is blown. Light emitting diode, a capacitor connected in parallel with the light emitting diode, a photodetector for detecting the light of the light emitting diode on the stator side, and a signal detected by the photodetector. A rotation comprising a color identification device for identifying the wavelength of the light and a position identification device for inputting a signal from the color identification device and determining which one of a plurality of the rectifying elements is malfunctioning. Rectifier failure detection device for rectifier. 3. An AC exciter which is directly connected to a rotary shaft of a synchronous generator and supplies the exciting power of the rotor of the synchronous generator to the rotor in a non-contact manner with the stator side of the synchronous generator. The rated voltage from the AC exciter connected in series with a rectifying element that forms a rotary rectifier that inputs the AC power source obtained by A fuse that melts when applied over, a resistor connected in parallel with the fuse and having a resistance value greater than that of the fuse, and a code converter connected in parallel with the resistor and the fuse, A light emitting diode which emits light by a power source having a light emitting pattern from this code converter, a photodetector which detects the light of this light emitting diode on the side of the stator, and a signal which is detected by this photodetector. A code signal input section for inputting a signal, a unique data signal database that holds the light emission pattern of the code converter as data in advance, and an output from this unique data signal database and the signal detected by the photodetector. A rectifying element failure detecting device for a rotary rectifier, comprising: a failure rectifying element determining section, and an alarm output section that outputs a signal determined by the failure rectifying element determining section. 4. An AC exciter that is directly connected to a rotary shaft of a synchronous generator and supplies the exciting power of the rotor of the synchronous generator to the rotor without contacting the stator side of the synchronous generator. The rated voltage from the AC exciter connected in series with a rectifying element that forms a rotary rectifier that inputs the AC power source obtained by A fuse that is blown when applied over, a resistor connected in parallel with the fuse and having a resistance value larger than that of the fuse, and an image pattern converter connected in parallel with the resistor and the fuse. , A light emitting diode which emits light by a power source from the image pattern converter, an image detector which detects the light of the light emitting diode as an optical image on the side of the stator, and an image detector which detects the light. An image signal input unit for inputting a known image signal, a unique image pattern database that holds the image pattern of the image pattern converter as data in advance, an output from the unique image pattern database, and a signal detected by the image detector. A rectifying element failure detecting device for a rotary rectifier, comprising: a failure rectifying element determining section for comparing and determining the above and an alarm output section that outputs a signal determined by the failure rectifying element determining section. 5. A photodetector provided on the stator side of a rotating electric machine for detecting the presence or absence of light emission of said light emitting diode, and a synchronization signal for determining a phase reference for said rotation axis based on the output of this photodetector. A synchronizing signal input section for inputting, a search coil provided on the stator side for detecting magnetic flux due to energization of the fuse, and a waveform input section for inputting a waveform of magnetic flux due to energization of the fuse based on an output from the search coil. A pulseless detection section for detecting a pulseless section due to the blowout of the fuse and discriminating the failed rectifying element based on the output from the waveform input section and the output from the synchronization signal input section; A rectifying element failure detection device for a rotary rectifier according to any one of claims 1 to 4, further comprising: an alarm device that outputs a determination result from the unit.