CN207380215U - A kind of utility unit for testing generator amature time constant - Google Patents
A kind of utility unit for testing generator amature time constant Download PDFInfo
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- CN207380215U CN207380215U CN201721424647.2U CN201721424647U CN207380215U CN 207380215 U CN207380215 U CN 207380215U CN 201721424647 U CN201721424647 U CN 201721424647U CN 207380215 U CN207380215 U CN 207380215U
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Abstract
A kind of utility unit for testing generator amature time constant provided by the utility model, including：Power electronic devices, field regulator, recorder analyser and the processor of one-way conduction；The DC master row that the power electronic devices of the one-way conduction is connected anti-parallel to the field regulator is in parallel with the linear de-excitation resistance of generator amature simultaneously；The recorder analyser connects the generator, for detecting the voltage of the generator；The excitation degaussing switch and the recorder analyser of the processor connection field regulator.The utility model passes through the linear de-excitation resistance parallel power electronic device in generator amature, so as to fulfill the Natural Attenuation of rotor current, generator voltage is detected by recorder analyser simultaneously, the curve of generator voltage decline can be obtained so as to which generator amature time constant be calculated, the device is not required in power plant equipped with the stand-by power supply of 6kV independences, also without complicated wiring, solves the technical issues of measurement trouble is complicated.
Description
Technical field
The utility model is related to Generator test technical field more particularly to a kind of test generator amature time constant
Utility unit.
Background technology
Generator amature time constant is generator excitation control key parameter, and the physics for having reacted generator operation is special
Property.Generating set can be modeled the excitation parameter of generator experiment, generator amature time constant after grid-connected and overhaul
Key parameter as generator has to accurately be measured.
Generally it is measured in the case of zero load in experiment.Requirement of experiment generator maintains rated speed, power generation
Machine is unloaded.Excitation part changes the mode of connection simultaneously, is powered from external temporary source to excitation-transformation variable, by excitation-transformation variable high-pressure side with dividing
Branch bus connection is interim to be disconnected and reliably isolates, and is selected 6kV backup circuit breakers cabinet in factory, is drawn from backup circuit breaker cabinet and connect 6kV high-tension cables
It is connected to excitation-transformation variable high-pressure side.
Measuring method is as follows：Under generator idle condition, field regulator operates in " determining angular way ", using unexpected
Change the method for field regulator output control voltage, make generator amature voltage step, record generator is surveyed with recorder analyser
The curve that voltage rises, by calculating generator amature time constant.
But existing method is needed in power plant equipped with the stand-by power supply of 6kV independences, since field experiment condition is limited,
It may be available without external independent current source.Meanwhile this method needs to be modified experimental wiring, it is necessary to which power plant runs people
Member is coordinated.
Therefore, traditional measurement technology is needed to be modified experimental wiring and needed in power plant equipped with 6kV independences
It is those skilled in the art's technical issues that need to address that stand-by power supply, which causes to measure troublesome complexity,.
Utility model content
The utility model embodiment provides a kind of utility unit for testing generator amature time constant, for solving to pass
The measurement technology of system needs to be modified experimental wiring and the stand-by power supply in power plant equipped with 6kV independences is needed to cause to measure
The technical issues of trouble is complicated.
A kind of utility unit for testing generator amature time constant provided by the utility model, including：One-way conduction
Power electronic devices, field regulator, recorder analyser and processor；
The power electronic devices of the one-way conduction is connected anti-parallel to the DC master row of the field regulator, while described
The power electronic devices of one-way conduction is in parallel with the linear de-excitation resistance of generator amature；
The recorder analyser connects the generator, for detecting the voltage of the generator；
The field regulator connects the generator；
The processor connects the excitation degaussing switch of the field regulator and the recorder analyser.
Preferably, the power electronic devices of the one-way conduction is heavy-duty diode.
Preferably, the position in parallel of the power electronic devices of the one-way conduction and the DC master row of the field regulator
Close to generator amature side.
Preferably, the recorder analyser is specially Portable electric quantity recorder analyser.
Preferably, the power electronic devices of the one-way conduction, the excitation degaussing switch of the field regulator and described
The silicon controlled module of field regulator forms circuit loop.
Preferably, exciting transformer, AVR modules, the generator of the silicon controlled module and the field regulator are formed
Circuit loop.
As can be seen from the above technical solutions, the utility model embodiment has the following advantages：
A kind of utility unit for testing generator amature time constant provided by the utility model, including：One-way conduction
Power electronic devices, field regulator, recorder analyser and processor；The power electronic devices reverse parallel connection of the one-way conduction
In the DC master row of the field regulator, while the power electronic devices of the one-way conduction and the linear of generator amature are gone out
Magneto-resistor is in parallel；The recorder analyser connects the generator, for detecting the voltage of the generator；The adjustment of field excitation
Device connects the generator；The processor connects the excitation degaussing switch of the field regulator and the recorder analyser.
The utility model is by the power electronic devices of the linear de-excitation resistance parallel connection one-way conduction in generator amature, so as to fulfill turning
The Natural Attenuation of electron current, while generator is connected by recorder analyser and detects generator voltage, generator can be obtained
So as to which generator amature time constant be calculated by processor, which is not required in power plant and is equipped with the curve that voltage declines
There is the stand-by power supply of 6kV independences, it is not required that complicated wiring, it is only necessary to one record of a power electronic devices in parallel and connection
Analyzer can realize the measurement of generator amature time constant, simple and convenient, solve the technical issues of measurement trouble is complicated.
Description of the drawings
It in order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of one embodiment of utility unit for testing generator amature time constant provided by the utility model
Device schematic diagram；
Fig. 2 is a kind of operation method of utility unit for testing generator amature time constant provided by the utility model
The flow chart of one embodiment；
Fig. 3 is to be obtained by a kind of utility unit measurement for testing generator amature time constant provided by the utility model
Generator voltage waveform graph；
Fig. 4 is the experiment curv figure for the generator amature time constant tested by conventional method；
Wherein, reference numeral is：1st, the power electronic devices of one-way conduction, 2, degaussing switch, 3, silicon controlled module, 4, encourage
Magnetic transformer.
Specific embodiment
The utility model embodiment provides a kind of utility unit for testing generator amature time constant, for solving to pass
The measurement technology of system needs to be modified experimental wiring and the stand-by power supply in power plant equipped with 6kV independences is needed to cause to measure
The technical issues of trouble is complicated.
Purpose of utility model, feature, advantage to enable the utility model is more apparent and understandable, below will knot
The attached drawing in the utility model embodiment is closed, the technical scheme in the utility model embodiment is clearly and completely described,
Obviously, the embodiments described below are only the utility model part of the embodiment, and not all embodiment.Based on this reality
With the embodiment in new, those of ordinary skill in the art are obtained all other without making creative work
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is a kind of schematic diagram of utility unit for testing generator amature time constant provided by the utility model, is schemed
In 1 be one-way conduction power electronic devices, be parallel to the linear de-excitation resistance of generator amature, and degaussing switch 2 is controllable
The conducting and disconnection of circuit processed, peripheral circuit is the simple form of field regulator in Fig. 1, the AVR monolithics including the lower left corner
Machine, silicon controlled module 3, exciting transformer 4 etc..Recorder analyser and processor are not drawn in figure.
Referring to Fig. 1, one of a kind of utility unit for testing generator amature time constant provided by the utility model
Embodiment, including：Power electronic devices 1, field regulator, recorder analyser and the processor of one-way conduction；
The power electronic devices 1 of one-way conduction is connected anti-parallel to the DC master row of field regulator, while one-way conduction
Power electronic devices 1 is in parallel with the linear de-excitation resistance of generator amature；
Recorder analyser connects generator, for detecting the voltage of generator；
Field regulator connects generator；
Processor connects the excitation degaussing switch 2 and recorder analyser of field regulator.
The utility model by the power electronic devices 1 of the linear de-excitation resistance parallel connection one-way conduction in generator amature,
So as to fulfill the Natural Attenuation of rotor current, while generator is connected by recorder analyser and detects generator voltage, it can be with
The curve of generator voltage decline is obtained so as to which generator amature time constant be calculated by processor, which need not
Equipped with the stand-by power supply of 6kV independences in power plant, it is not required that complicated wiring, it is only necessary to a power electronic devices in parallel and company
The measurement of generator amature time constant can be realized by connecing a recorder analyser, simple and convenient, and it is complicated to solve measurement trouble
The technical issues of.
Further, degaussing switch 2 can be further defined to excitation degaussing switch 2, and power electronic devices 1 can be limited further
It is set to device for high-power power electronic 1.
Further, the power electronic devices 1 of one-way conduction is specially heavy-duty diode.
Further, the power electronic devices 1 of one-way conduction is located proximate to the in parallel of the DC master row of field regulator
Generator amature side.
Further, recorder analyser is specially Portable electric quantity recorder analyser.It is of course also possible to it is oscillograph.
Further, the power electronic devices 1 of one-way conduction, the excitation degaussing switch 2 of field regulator and adjustment of field excitation
The silicon controlled module 3 of device forms circuit loop.
Further, silicon controlled module 3 and exciting transformer 4, AVR modules, the generator of field regulator form circuit
Circuit.
The above are to an a kind of reality of the utility unit for testing generator amature time constant provided by the utility model
Example is applied to be described in detail, it below will be to a kind of practical dress for testing generator amature time constant provided by the utility model
The operation method put is described in detail.
Referring to Fig. 2, a kind of operation of utility unit for testing generator amature time constant provided by the utility model
Method is tested based on a kind of utility unit for testing generator amature time constant described above, including：
101：Control the excitation degaussing switch of tripping field regulator；Disconnect switch.
102：The curve that recorder analyser detection generator voltage is controlled to decline；Recorder analyser carries voltage detecting mould
Block can facilitate detection voltage and form voltage change curve.
103：At the time of when record generator voltage t1 at the time of begin to decline, record generator voltage have dropped 63.2%
T2 subtracts t1 by calculating t2 and obtains generator amature time constant.
Above-mentioned method and step can be performed by processor, at the time of processor accurately can read generator voltage and begin to decline
T1, it is only necessary to voltage slope is detected from the time of 0 variation, thus it is very accurate.
Further, further included before step 101：
The power electronic devices and generator amature of the one-way conduction of the DC master row of field regulator will be connected anti-parallel to
Linear de-excitation resistance it is in parallel, then generator is controlled to maintain rated speed and makes generator unloaded.
Further, the curve that the specific detection of the recorder analyser in order to control generator excitation voltage of step 102 declines.
Further, the parallel connection of the power electronic devices of one-way conduction is located proximate to generator amature side.
The principle of the utility model will be explained below：
The test thinking of the utility model is：Using the Natural Attenuation principle of rotor loop electric current, unidirectionally led by additional
Logical device for high-power power electronic 1 realizes the measurement of generator amature time constant.Method is directly female in generator direct current
The device for high-power power electronic 1 of row's one-way conduction in parallel, generator amature time constant is calculated by recording.
The measurement of generator amature time constant is measurement generator excitation voltage.According to known convention, generator is empty
Carry potential EqWith exciting current IFDIt is directly proportional.No-load emf, exciting current, the relation of excitation voltage are under steady state condition：
Eq∝IFD=UFD/RFD
Generator amature winding equivalent can be considered a big inductance, and excitation voltage can be mutated and exciting current and hair
The change of empty load of motor potential needs the regular hour, and there are a unloaded rotor time constants.The parameter can be preferable
The characteristic of the machine response speed of generator is weighed, is one of important parameter for generator performance.
As shown in Figure 1, it is necessary to measure T 'd0, then need to one jump function to observe the time constant of its response.This reality
Existing method is improved with new, (has been existed in the additional device for high-power power electronic 1 with one-way conduction of DC master row
Experimental field practicality heavy-duty diode is verified), so as to fulfill the Natural Attenuation of rotor current, while surveyed by recorder analyser
The curve that generator voltage declines is recorded, by calculating generator amature time constant.
The step of method is realized is as follows：
1st, by schematic diagram as shown in Figure 1, generator maintains rated speed, and generator is unloaded, in the direct current of field regulator
Reverse parallel connection heavy-duty diode on busbar, parallel connection is located proximate to generator amature side and the linear de-excitation resistance of rotor is in parallel.
2nd, tripping excitation degaussing switch；
3rd, the curve of record generator voltage decline is surveyed using recorder analyser；
4th, according to known convention, input as jump function under standard, export as designation number function, time constant is at this time
Rising time started to the arrival 63.2% corresponding time of difference.It is easy for that generator can be drawn to being according to experiment curv
System equivalent time constant.
The technical issues of how the utility model specifically solves illustrated below by way of the application examples of the utility model：
Generator is maintained into rated speed, generator is unloaded, the big work(of reverse parallel connection on the DC master row of field regulator
Rate diode, parallel connection is located proximate to generator amature side and the linear de-excitation resistance of rotor is in parallel.
Experiment process is as follows, and generator zero load boosts to 50% specified set end voltage, tripping degaussing switch 2, allows generator
Rotor current surveys record by the heavy-duty diode afterflow of reverse parallel connection, rotor current Natural Attenuation, power consumption recorder analyser
Generator voltage decline curve, calculates generator amature time constant, and recording figure is shown in Fig. 3.
As can be seen from Figure 3, the rotor time constant measured value of generator is 8.43s, and producer's design load is 8.18s, measurement
Value is basically identical with design load.
To the beneficial effects of the utility model be illustrated by the comparison with traditional technology below.
It uses conventional methods and has carried out corresponding test, powered from external temporary source to excitation-transformation variable, excitation is become higher
Pressure side connects interim disconnection with branch bar and reliably isolates, and selects 6kV backup circuit breakers cabinet in factory, draws from backup circuit breaker cabinet and meet 6kV
High-tension cable is connected to excitation-transformation variable high-pressure side.Suddenly change field regulator output control voltage, makes generator amature voltage transition,
Use WFLC electricity recorder analyser record generator excitation voltage UFD, exciter current of generator IFD and generator unit stator electricity
Pressure, recording figure are shown in Fig. 4.
The rotor time constant 8.66s of generator is acquired by Fig. 4.The generator that the method that the utility model uses measures
Rotor time constant measured value is 8.43s, and producer's design load is 8.18s, and the measured value and design load of the utility model are more
It is close.
Therefore, according to above-mentioned analysis, it can be deduced that the utility model has the following advantages：
Compared with prior art, technical solutions of the utility model have following obvious advantages：
1st, in the secondary side DC master row directly additional large power power electronic appliance with one-way conduction, operation is relatively run
It is more easy that personnel adjust excitation side joint line；
2nd, measurement links are directly rotor-side, without the influence of silicon-controlled part and AVR part-time constants, measurement result
It is more accurate；
3rd, it is not only restricted to whether scene has 6kV stand-by power supplies.
The above, above example are only to illustrate the technical solution of the utility model, rather than its limitations；Although ginseng
The utility model is described in detail according to previous embodiment, it will be understood by those of ordinary skill in the art that：It is still
It can modify to the technical solution recorded in foregoing embodiments or which part technical characteristic is equally replaced
It changes；And these modifications or replacement, the essence of appropriate technical solution is not made to depart from various embodiments of the utility model technical solution
Spirit and scope.
Claims (6)
1. a kind of utility unit for testing generator amature time constant, which is characterized in that including：The power electronics of one-way conduction
Device, field regulator, recorder analyser and processor；
The power electronic devices of the one-way conduction is connected anti-parallel to the DC master row of the field regulator, while described unidirectional
The power electronic devices of conducting is in parallel with the linear de-excitation resistance of generator amature；
The recorder analyser connects the generator, for detecting the voltage of the generator；
The field regulator connects the generator；
The processor connects the excitation degaussing switch of the field regulator and the recorder analyser.
2. a kind of utility unit for testing generator amature time constant according to claim 1, which is characterized in that described
The power electronic devices of one-way conduction is heavy-duty diode.
3. a kind of utility unit for testing generator amature time constant according to claim 1, which is characterized in that described
The power electronic devices of one-way conduction is in parallel with the DC master row of the field regulator to be located proximate to generator amature side.
4. a kind of utility unit for testing generator amature time constant according to claim 1, which is characterized in that described
Recorder analyser is specially Portable electric quantity recorder analyser.
5. a kind of utility unit for testing generator amature time constant according to claim 1, which is characterized in that described
The silicon-controlled mould of the power electronic devices of one-way conduction, the excitation degaussing switch of the field regulator and the field regulator
Block forms circuit loop.
6. a kind of utility unit for testing generator amature time constant according to claim 5, which is characterized in that described
Exciting transformer, AVR modules, the generator of silicon controlled module and the field regulator form circuit loop.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107643487A (en) * | 2017-10-31 | 2018-01-30 | 广东电网有限责任公司电力科学研究院 | A kind of utility unit and method for testing generator amature time constant |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107643487A (en) * | 2017-10-31 | 2018-01-30 | 广东电网有限责任公司电力科学研究院 | A kind of utility unit and method for testing generator amature time constant |
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