CN203798923U - Dual-function dual-redundancy monitoring circuit capable for monitoring faults of rotating rectifier and excitation circuit - Google Patents
Dual-function dual-redundancy monitoring circuit capable for monitoring faults of rotating rectifier and excitation circuit Download PDFInfo
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- CN203798923U CN203798923U CN201420123199.2U CN201420123199U CN203798923U CN 203798923 U CN203798923 U CN 203798923U CN 201420123199 U CN201420123199 U CN 201420123199U CN 203798923 U CN203798923 U CN 203798923U
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Abstract
The utility model discloses a dual-function dual-redundancy monitoring circuit capable for monitoring faults of a rotating rectifier and an excitation circuit. A signal of the monitoring circuit is obtained from a sampling resistor in the excitation circuit of an alternating-current exciter. The signal obtained from the sampling resister is divided into two paths, one path of the signal is used for detecting the content of harmonic waves in the signal, while the other path is used for detecting the size of an excitation current. The beneficial effects of the utility model are that the faults of the rotating rectifier can be monitored in two ways, so that the on-line monitoring of the rotating rectifier is achieved, the reliability of fault monitoring is improved, and the cost is reduced; and the circuit can also monitor the abnormal increase of the excitation current at the same time, so that the circuit has the advantage of simultaneous monitoring of two faults, thereby greatly simplifying the fault monitoring technology of generators, and improving the reliability and practicality of fault monitoring.
Description
Technical field
The utility model relates to brushless AC generator field, particularly relates to the difunctional and two remaining observation circuits of a kind of rotating rectifier and field circuit fault.
Background technology
Brushless AC generator adopts a revolving-armature type synchronous generator, is installed on epitrochanterian rectifier and a rotary pole formula synchronous generator, jointly be built into the generator of a brushless, owing to having saved brush and slip ring, greatly improved the reliability of generator.Rotating rectifier is to realize brushless critical component, is also semiconductor devices unique in generator.Because rectifier is operated under high rotating speed and higher temperature state, be subject to the impact of centrifugal force, thermal stress etc., so its failure rate is higher.When commutation diode is short-circuited or during open fault, directly affects the safe operation of AC exciter and main generator.Therefore how determining quickly and accurately the fault of rotating rectifier, and take timely and accurately safeguard measure, is the necessary behave that guarantees the normal operation of generator.In addition,, when generator transships, when overcurrent or short trouble, under the effect of pressure regulator, the exciting current of generator can obviously increase.Therefore, in generator operation process, monitor at any time the size of exciting current, be transship, a kind of standby means of overcurrent and short-circuit protection, be a kind of remaining control strategy.
Singularity due to rotating rectifier position, in brushless AC generator, the malfunction monitoring of rotating rectifier is a technical barrier always, the different fault diagnosis method having worked out at present, analysis of harmonic spectrum method or intelligent algorithm have all been adopted, these method for diagnosing faults all need to work out complicated software and carry out a large amount of data analyses and computing, the complexity that has increased to a certain extent engine controller soft and hardware, implements more difficult.Therefore be necessary to design a kind of simple and reliable, low-cost and multi-functional fault monitoring circuit and monitor the fault of rotating rectifier and the fault of field circuit.
Summary of the invention
The purpose of this utility model is to provide a kind of rotating rectifier and field circuit fault is difunctional and two remaining observation circuits, to solve current Fault Diagnosis of Rotating Rectifier method too complex and the high deficiency of cost.
To achieve these goals, the technical solution adopted in the utility model is to provide a kind of rotating rectifier and field circuit fault is difunctional and two remaining observation circuits, the sample resistance of this observation circuit is connected among brushless AC generator, this brushless AC generator comprises revolving-armature type AC exciter, rotating rectifier and rotary pole formula main generator, rotating rectifier, for the three-phase alternating current sending on exciter rotor armature winding is rectified into direct current, is supplied with the rotor field coil of main generator; Wherein: described observation circuit is divided into two branch roads, a circuit branch that branch road is the harmonic content in monitoring exciting current, another branch road is the circuit branch of monitoring exciting current size;
The circuit branch of described monitoring harmonic content includes block isolating circuit, linear amplifier circuit, current rectifying and wave filtering circuit and comparer, the output terminal of described capacitance-resistance block isolating circuit is received the input end of linear amplifier, the output terminal of linear amplifier is received the input end of current rectifying and wave filtering circuit, and the output terminal of current rectifying and wave filtering circuit is received the input end of comparer;
The circuit branch of described monitoring exciting current size comprises active low-pass filter amplifying circuit, comparer, and the output terminal of described low-pass filtering amplifying circuit is received the input end of comparer;
Described observation circuit is arranged in the engine controller of brushless AC generator, shares the working power of engine controller; Described two branch roads are connected on the output terminal of differential amplifier, the input end of differential amplifier connects respectively the two ends of sample resistance, described sample resistance is connected in the field circuit of AC exciter, and the voltage signal of sample resistance size and waveform and AC exciter exciting current are in full accord.
Effect of the present utility model is that the difunctional and two remaining observation circuits of this rotating rectifier and field circuit fault need not adopt complicated data analysis and calculating, only by gathering the exciting current signal of exciter, and just can realize two remainings of faults in rotating rectifiers are monitored by simple electronic circuit, can realize the on-line monitoring of rotating rectifier and field circuit fault.Can also monitor the abnormal increase of exciting current simultaneously, have advantages of that a circuit realizes two kinds of functions, greatly simplify generator failure monitoring technology, improve the dependable with function of failure monitoring.Compare with other Fault Monitoring of Rotating Rectifiers technology, the hardware cost of this circuit can reduce more than 90%, and need not work out complicated data processing software.
Accompanying drawing explanation
Fig. 1 is observation circuit block diagram of the present utility model.
In figure:
1, be connected on sample resistance 2, the differential amplifier in exciter excitation circuit
3, block isolating circuit 4, linear amplifier circuit 5, current rectifying and wave filtering circuit 6, comparer
7, active low-pass filter and amplifying circuit 8, comparer 9, engine controller
100, the circuit branch of the circuit branch 200 of monitoring harmonic content, monitoring exciting current size
Embodiment
By reference to the accompanying drawings rotating rectifier of the present utility model and field circuit fault structure difunctional and two remaining observation circuits are illustrated.
Difunctional and the two remaining observation circuits of rotating rectifier of the present utility model and field circuit fault, the sample resistance of this observation circuit is connected among brushless AC generator, this brushless AC generator comprises revolving-armature type AC exciter, rotating rectifier and rotary pole formula main generator, rotating rectifier, for the three-phase alternating current sending on exciter rotor armature winding is rectified into direct current, is supplied with the rotor field coil of main generator;
Described observation circuit is divided into two branch roads, a circuit branch 100 that branch road is the harmonic content in monitoring exciting current, and another branch road is the circuit branch 200 of monitoring exciting current size;
The circuit branch 100 of described monitoring harmonic content includes block isolating circuit 3, linear amplifier circuit 4, current rectifying and wave filtering circuit 5 and comparer 6, the output terminal of described capacitance-resistance block isolating circuit 3 is received the input end of linear amplifier 4, the output terminal of linear amplifier 4 is received the input end of current rectifying and wave filtering circuit 5, and the output terminal of current rectifying and wave filtering circuit 5 is received the input end of comparer 6;
The circuit branch 200 of described monitoring exciting current size comprises active low-pass filter amplifying circuit 7, comparer 8, and the output terminal of described low-pass filtering amplifying circuit 7 is received the input end of comparer 8;
Described observation circuit is arranged on 9 li of the engine controllers of brushless AC generator, shares the working power of engine controller 9; Described two branch roads are connected on the output terminal of differential amplifier 2, the input end of differential amplifier 2 connects respectively the two ends of sample resistance 1, described sample resistance 1 is connected in the field circuit of AC exciter, and the voltage signal of sample resistance 1 size and waveform and AC exciter exciting current are in full accord.
Rotating rectifier in described brushless AC generator is three-phase half wave retifier or three-phase full wave rectifier circuit.
The voltage signal taking out from sample resistance 1 has comprised two information: the one, and the size of exciting current of exciter, the 2nd, the size of harmonic content in exciting current.Its harmonic content comes from the distinctive Harmonic Armature Reaction phenomenon of AC exciter.The ultra-weak electronic signal obtaining from sample resistance 1 is sent to differential amplifier 2, the output signal of this amplifier is divided into two-way, one road signal is sent to the circuit branch 100 of monitoring harmonic content, in this branch road, signal is input to linear amplifier 4 through capacitance-resistance block isolating circuit 3 after straight, signal after amplifier 4 amplifies is input in current rectifying and wave filtering circuit 5, and the signal after current rectifying and wave filtering circuit 5 is input in comparer 6, and the output signal of comparer 6 is sent in next stage control circuit.
From the signal of differential amplifier 2 outputs, be sent to another branch 200, in this branch road, signal, after active low-pass filter amplifying circuit 7 is processed, is input in comparer 8 simultaneously, and the output signal of comparer 8 is sent in next stage control circuit.
Because the load of AC exciter armature rotor winding is commutation diode, it is no longer sinusoidal wave that its unilateral conduction makes the armature supply of exciter, but nonsinusoidal alternate current.By Fourier series, decompose, non-sinusoidal armature supply can be decomposed into first-harmonic and each harmonic component.The existence of armature harmonic current components will produce corresponding harmonic magnetic potential in motor gas-gap, the rotating magnetic field that these harmonic magnetic potentials form in motor gas-gap can produce harmonic wave electromotive force in AC exciter stator excitation winding, and this phenomenon is called Harmonic Armature Reaction.Known by analyzing, when three-phase full-wave rotating rectifier is working properly, in exciting current of exciter, only contain 6K order harmonic components, and harmonic amplitude is less; And when faults in rotating rectifiers, in exciting current of exciter, contain 1 time, 2 order harmonic components that amplitude is larger.Therefore the amplitude size by harmonic content just can determine rotating rectifier non-fault.
Known according to the control characteristic of alternator, when the power factor of main generator load changes within the specific limits, between the load current of generator and exciting current, there is comparatively fixing numerical relation.When rotating rectifier is short-circuited or during open fault, its rectifier output voltage will decline, main generator output voltage also declines thereupon, and under the effect of generator regulator, the exciting current of exciter can increase when normal to some extent.Therefore,, when the size of main generator load and power factor are when constant, the abnormal increase of exciting current shows that generator excited system has fault to occur.So by the size of monitoring exciting current of exciter, also can indirectly judge the fault of rotating rectifier.So this circuit has two remaining monitoring functions, can greatly improve the reliability of Fault Monitoring of Rotating Rectifiers.
In addition, when main generator output terminal transships, when overcurrent or short trouble, generator voltage will decline, under the effect of generator regulator, the exciting current of exciter also will increase extremely, therefore by monitor the size of exciting current of exciter and the size of main generator load current simultaneously, also can indirectly judge whether generator transships, overcurrent or short trouble.Therefore this observation circuit also can be used as the back-up protection of generator overload, overcurrent and short trouble, is a kind of remaining control strategy.
As can be seen here, this observation circuit has two functions: monitor the abnormal fault increasing of faults in rotating rectifiers and generator excitation, and faults in rotating rectifiers monitored simultaneously by two paths of signals simultaneously, have two remaining monitoring strategies.
As shown in Figure 1, first the signal that comes from the sample resistance 1 in field circuit is sent in differential amplifier 2 and amplifies, and the signal after amplification is sent to respectively two branch circuits.Article one, the circuit branch 100 of monitoring harmonic content is comprised of block isolating circuit 3, linear amplifier circuit 4, current rectifying and wave filtering circuit 5 and comparer 6, for monitoring the harmonic content of exciting current of exciter; The circuit branch 200 of another monitoring exciting current size is comprised of active low-pass filter and amplifying circuit 7 and comparer 8, for monitoring the size of exciting current of exciter.
As shown in Figure 1, come from ultra-weak electronic signal on exciting current sample resistance 1 and be input in differential amplifier 2 and amplify, this amplifier can suppress common mode interference signal; Signal after amplification is divided into two-way: a road signal is sent to the circuit branch 100 of monitoring harmonic content, through the exciting current sampled signal process capacitance-resistance block isolating circuit 3 amplifying, DC component in sampled signal is cut off, AC harmonic component is input in linear amplifier 4 and amplifies, AC signal after amplification is after current rectifying and wave filtering circuit 5, the direct current signal size of its output has reflected the size of harmonic content, and the size of this harmonic content can reflect the duty of rotating rectifier.Direct current signal after rectifying and wave-filtering is sent to comparer 6, when rotating rectifier is working properly, harmonic content amplitude in field circuit is very little, also very little through the AC signal after straight processing, DC voltage after rectifying and wave-filtering is processed is less than the reference voltage of comparer 6 in-phase ends, therefore comparer 6 output high level, represent that rotating rectifier is working properly; When faults in rotating rectifiers, in exciting current, contain the harmonic content that amplitude is larger, through the voltage signal after straight, amplification, rectifying and wave-filtering, be greater than the reference voltage of comparer 6 in-phase ends, make comparer 6 output low levels, represent that rotating rectifier has fault.
Exciting current signal after differential amplifier 2 amplifies is sent in the circuit branch 200 of another monitoring exciting current size, comprises two components: the size of exciting current and the size of harmonic content in this signal.This signal is through active low-pass filter and amplifying circuit 7, and by after harmonic content filtering wherein, the DC component of output reflects the mean value of exciting current of exciter, and this DC quantity is sent in comparer 8.When rotating rectifier is working properly, the exciting current size of exciter is also within setting range, and comparer 8 is exported high level; When faults in rotating rectifiers, main generator output end voltage declines, and under the effect of generator regulator, the exciting current of exciter is by the value being greater than under normal circumstances, and comparer 8 output low levels, represent that rotating rectifier has fault.Visible, when rotating rectifier has fault, this observation circuit output two-way fault-signal, this circuit has two remaining monitoring functions.
In addition, when main generator does not transship, when overcurrent and short trouble, under certain loading condition, the exciting current of exciter also within setting range, comparer 8 output high level; When main generator output terminal transships, when overcurrent and short trouble, main generator output voltage will decline, and under the effect of generator regulator, the exciting current of exciter will increase extremely, and at this moment comparer 8 output low levels, show that generator breaks down.This is also a kind of back-up protection strategy to generator overload, overcurrent and short trouble, is a kind of remaining control strategy, can greatly improve the reliability of emergency protection, is a kind of control strategy often adopting in aircraft system.
The advantages such as that the difunctional and two remaining observation circuits of rotating rectifier provided by the utility model and field circuit fault have is simple in structure, with low cost, easy realization, need not increase the extra complicated circuits such as harmonic analysis instrument and data processing software, only by simple electronic circuit, just can detect faults in rotating rectifiers and field circuit fault simultaneously, a circuit provides two kinds of functions, fault has two kinds of monitoring schemes, therefore has larger practical value.
Claims (2)
1. a rotating rectifier and field circuit fault is difunctional and two remaining observation circuits, this observation circuit is connected among brushless AC generator, this brushless AC generator comprises revolving-armature type AC exciter, rotating rectifier and rotary pole formula main generator, rotating rectifier, for the three-phase alternating current sending on exciter rotor armature winding is rectified into direct current, is supplied with the rotor field coil of main generator;
It is characterized in that: described observation circuit is divided into two branch roads, a circuit branch (100) that branch road is the harmonic content in monitoring exciting current, another branch road is the circuit branch (200) of monitoring exciting current size;
The circuit branch of described monitoring harmonic content (100) includes block isolating circuit (3), linear amplifier circuit (4), current rectifying and wave filtering circuit (5) and comparer (6), the output terminal of described capacitance-resistance block isolating circuit (3) is received the input end of linear amplifier (4), the output terminal of linear amplifier (4) is received the input end of current rectifying and wave filtering circuit (5), and the output terminal of current rectifying and wave filtering circuit (5) is received the input end of comparer (6);
The circuit branch (200) of described monitoring exciting current size comprises active low-pass filter amplifying circuit (7), comparer (8), and the output terminal of described low-pass filtering amplifying circuit (7) is received the input end of comparer (8);
It is inner that described observation circuit is arranged on the engine controller (9) of brushless AC generator, shares the working power of engine controller (9); Described two branch roads are connected on the output terminal of differential amplifier (2), the input end of differential amplifier (2) connects respectively the two ends of sample resistance (1), described sample resistance (1) is connected in the field circuit of AC exciter, and the voltage signal size of sample resistance (1) and waveform and AC exciter exciting current are in full accord.
2. the difunctional and two remaining observation circuits of rotating rectifier according to claim 1 and field circuit fault, is characterized in that: the rotating rectifier in described brushless AC generator is three-phase half wave retifier or three-phase full wave rectifier circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420123199.2U CN203798923U (en) | 2014-03-19 | 2014-03-19 | Dual-function dual-redundancy monitoring circuit capable for monitoring faults of rotating rectifier and excitation circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420123199.2U CN203798923U (en) | 2014-03-19 | 2014-03-19 | Dual-function dual-redundancy monitoring circuit capable for monitoring faults of rotating rectifier and excitation circuit |
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| CN203798923U true CN203798923U (en) | 2014-08-27 |
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| CN201420123199.2U Expired - Fee Related CN203798923U (en) | 2014-03-19 | 2014-03-19 | Dual-function dual-redundancy monitoring circuit capable for monitoring faults of rotating rectifier and excitation circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852669A (en) * | 2014-03-19 | 2014-06-11 | 中国民航大学 | Rotating rectifier and exciter circuit fault dual-function and dual-redundancy monitoring circuit |
| CN105826900A (en) * | 2016-05-17 | 2016-08-03 | 广东南丰电气自动化有限公司 | Microcomputer protection device capable of efficiently protecting brushless excitation generator |
| CN106291146A (en) * | 2015-05-13 | 2017-01-04 | 中广核工程有限公司 | The fault detection method of heterogeneous brushless excitation system rotating rectifier and device |
| CN106483442A (en) * | 2016-11-11 | 2017-03-08 | 凌云科技集团有限责任公司 | The testing equipment of combination driven generator commutation diode and detection method |
| CN111355456A (en) * | 2018-12-21 | 2020-06-30 | 美国亚德诺半导体公司 | Current monitor with fault detection |
-
2014
- 2014-03-19 CN CN201420123199.2U patent/CN203798923U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852669A (en) * | 2014-03-19 | 2014-06-11 | 中国民航大学 | Rotating rectifier and exciter circuit fault dual-function and dual-redundancy monitoring circuit |
| CN103852669B (en) * | 2014-03-19 | 2017-07-04 | 中国民航大学 | Rotating rectifier and the difunctional and double remaining observation circuit of field circuit failure |
| CN106291146A (en) * | 2015-05-13 | 2017-01-04 | 中广核工程有限公司 | The fault detection method of heterogeneous brushless excitation system rotating rectifier and device |
| CN106291146B (en) * | 2015-05-13 | 2019-03-05 | 中广核工程有限公司 | The fault detection method and device of multiphase brushless excitation system rotating rectifier |
| CN105826900A (en) * | 2016-05-17 | 2016-08-03 | 广东南丰电气自动化有限公司 | Microcomputer protection device capable of efficiently protecting brushless excitation generator |
| CN106483442A (en) * | 2016-11-11 | 2017-03-08 | 凌云科技集团有限责任公司 | The testing equipment of combination driven generator commutation diode and detection method |
| CN111355456A (en) * | 2018-12-21 | 2020-06-30 | 美国亚德诺半导体公司 | Current monitor with fault detection |
| CN111355456B (en) * | 2018-12-21 | 2024-01-12 | 美国亚德诺半导体公司 | Current monitor with fault detection |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140827 Termination date: 20150319 |
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| EXPY | Termination of patent right or utility model |