CN107861062A - Electric generating set rotor short circuit on-line monitoring system based on exciter current of generator synchronized sampling - Google Patents
Electric generating set rotor short circuit on-line monitoring system based on exciter current of generator synchronized sampling Download PDFInfo
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- CN107861062A CN107861062A CN201711041312.7A CN201711041312A CN107861062A CN 107861062 A CN107861062 A CN 107861062A CN 201711041312 A CN201711041312 A CN 201711041312A CN 107861062 A CN107861062 A CN 107861062A
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- current
- carbon brush
- generator
- generating set
- short circuit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/346—Testing of armature or field windings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a kind of electric generating set rotor short circuit on-line monitoring system based on exciter current of generator synchronized sampling, including carbon brush current acquisition unit, front end data acquisition device, server and the power harvester being sequentially connected；Carbon brush current acquisition unit is used for the current signal for gathering generator carbon brush；Front end data acquisition device is used for the carbon brush current signal for obtaining each carbon brush current acquisition unit, obtains overall and individually each carbon brush electric current signal characteristic；Power harvester is used for the output parameter for gathering generator；Server is used to handle exciting current characteristic and the relation of generator output electrical parameter, and alarm signal is sent if exciting current characteristic and the real-time corresponding relation of output electrical parameter are abnormal；Whole system uses wireless synchronization clock unit, for whole system synchronous data sampling.The data processing based on synchronized sampling can eliminate influence of the difference to exciting current of single carbon brush, draw the real-time change for reflecting overall effectively exciting current.
Description
Technical field
The present invention relates to a kind of electric generating set rotor short circuit on-line monitoring system based on exciter current of generator synchronized sampling
System.
Background technology
Generator is the heart of whole power system, and it is that the energy of every other form is changed into the important ring of electric energy
Section, the safety and stability that it runs are most important to whole electric network security and stability.Generator amature short trouble
It is the multiple and most common failure of generator, its short trouble is divided into two kinds of short circuit manners of turn-to-turn short circuit and shorted to earth again.Slightly
Turn-to-turn short circuit anything can't be caused to influence on generating set, fault signature also unobvious, be usually ignored, but if this
Abnormal state cannot be handled timely and effectively, and turn-to-turn short circuit degree can aggravate, and unit vibration can be caused to strengthen, exciting current
Significantly increase, winding temperature rise phenomena such as, situations such as when serious rotor ground fault, main shaft's magnetizing, retaining ring being caused to burn.Generate electricity
During machine normal operation, rotor windings have certain direct-to-ground capacitance and insulaion resistance over the ground, but due to rotor heating or other originals
During because causing rotor windings insulation against ground to damage, rotor windings ground connection will occur.Influence of the single-point grounding to generator is little,
Generator only sends alarm；It but if this abnormal state is handled not in time, can develop at 2 points, now be produced in rotor loop
Raw very big short circuit current, can cause burn rotor journal and bearing shell, main shaft's magnetizing, in addition it is non-the serious accident such as stop, to generating electricity
Grave danger be present in machine safe and stable operation.
Generator amature short trouble is one and formed by incipient small short-circuit conditions long-term degradation, if can be
Failure is first, early detection, analyzing failure cause, and determines failure happening part and the order of severity, and Reasonable adjustment repair schedule can
Effectively prevent failure from further deteriorating, greatly improve the economy and reliability of generator operation.Therefore to generator amature
Short circuit on-line monitoring is just extremely necessary, can effectively prevent failure in possible trouble.
And for the monitoring of rotor short-circuit failure, there is progress largely to study and test both at home and abroad, the direct current of proposition
Resistance method, AC impedence method, stator circulation monitoring method and search coil method etc., but or on-line monitoring, or accuracy rate can not be realized
It is low, or complexity is installed, by environmental restrictions etc. in practical application, it is all not satisfactory.
The content of the invention
It is an object of the invention to provide a kind of electric generating set rotor short circuit based on exciter current of generator synchronized sampling to exist
Line monitoring system, to solve the problems, such as that the monitoring system of existing rotor short-circuit failure is complicated, big by environmental restrictions.
In order to solve the above technical problems, the present invention provides a kind of generating set based on exciter current of generator synchronized sampling
Rotor short-circuit on-line monitoring system, including carbon brush current acquisition unit, front end data acquisition device, server and the work(being sequentially connected
Rate collector, wireless synchronization clock unit；
The carbon brush current acquisition unit includes some and one-to-one current collector of carbon brush, the current collector
For the current signal for the single carbon brush for gathering generating set respectively；
The front end data acquisition device is used for the current signal for obtaining the carbon brush that all current collectors are collected,
Obtain the electric current summation of all carbon brush of the unit and the exciting current characteristic of single carbon brush；
The power harvester is used for the real-time output electrical parameter for gathering generator；
Server is used to handle exciting current characteristic and generator output electrical parameter relation, if exciting current characteristic and output
The real-time corresponding relation of electrical parameter then sends alarm signal extremely；
The wireless synchronization clock unit, for controlling dozens of carbon brush current collector and power harvester to carry out with week
Phase gathers.
Further, the server also includes error concealment unit；The error concealment unit is in synchronized sampling
On the basis of the current signal feature according to all carbon brush synchronously got realized, eliminating the base of indivedual carbon brush differences interference
On plinth, the total exciting current characteristic drawn is actually used for the electric current of generator amature excitation, in generator normal work, has
Effect exciting current characteristic parameter and generator output electrical parameter have normal corresponding relation curve, are such as broken down in generator,
The homologous thread can deviate, so as to find generator failure in time.
Further, the current collector is closed-loop Hall current sensor.
Further, the system also includes the alarm being connected with the server, and the alarm is used for according to
Alarm signal is alarmed caused by server.
Further, the system also includes the repeater being connected between the front end data acquisition device and server, institute
Repeater is stated to be cached with the electric current of the carbon brush for receiving.
Beneficial effects of the present invention are：By gathering the current parameters of each carbon brush and the power output of generating set in real time
Signal and data characteristics, then calculate by server the power output signal of the electric current summation generating set of all carbon brush of the unit
Corresponding relation, and judge that whether in normal scope, the electric current summation is drawn if comparing for corresponding relation between the two
Alarm signal is not produced then in normal range (NR) with the corresponding relation of the power output signal, and warning reminding staff takes
Related measure, it can be noted abnormalities in time by the system, and the system only need to be to the current signal and generating set of carbon brush
Power output signal be acquired, required number of devices is few, easy for construction, and automaticity is high, is safeguarded without personnel, and
It is small by environmental restrictions.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding of the present application, the part of the application is formed, at this
Same or analogous part, the schematic description and description of the application are represented using identical reference number in a little accompanying drawings
For explaining the application, the improper restriction to the application is not formed.In the accompanying drawings：
Fig. 1 is the schematic diagram of one embodiment of the invention.
Fig. 2 is the schematic diagram of the closed-loop Hall current sensor of one embodiment of the invention.
Embodiment
Electric generating set rotor short circuit on-line monitoring system based on exciter current of generator synchronized sampling as shown in Figure 1,
Including carbon brush current acquisition unit, front end data acquisition device, server and the power harvester being sequentially connected；Separately below to each
Individual part is described in detail：
The carbon brush current acquisition unit includes some and one-to-one current collector of carbon brush, the current collector
For gathering the current signal of generator carbon brush.The current collector in the application is closed-loop Hall current sensor, its
Schematic diagram is as shown in Fig. 2 the specific work process of closed-loop Hall current sensor is：When major loop have an electric current by when,
Caused magnetic field is assembled and sensed on hall device H by magnet ring on wire, and caused signal output is used for driving power pipe
And turn it on, so as to obtain a compensation electric current IS.This electric current produces magnetic field by multicircuit winding again, and the magnetic field is with being tested
Magnetic field contrast caused by electric current, thus original magnetic field is compensate for, it is gradually reduced hall device H output.When with IP
When magnetic field caused by being multiplied with the number of turn is equal, ISIt is not further added by, hall device H at this moment plays a part of indicating Zero flux,
I can now be passed throughSTo test IP.Work as IPDuring change, balance and destroyed, hall device H has signal output, that is, repeats above-mentioned
Process reaches balance again.Any change of tested electric current can all destroy this balance.Once magnetic field disequilibrium, hall device
H just has signal output.After power amplification, just there is corresponding electric current to flow through secondary windings to be mended to unbalance magnetic field immediately
Repay.Unbalance to balancing again from magnetic field, less than 1us on required time theory, this is the process of a dynamic equilibrium.Therefore,
From macroscopically, secondary compensation electric current number of ampere turns is all equal with the number of ampere turns of primary tested electric current at any time.
The front end data acquisition device is used to obtain the carbon brush that all closed-loop Hall current sensors are collected
Current signal, and if being calculated carbon brush current signal and electric current summation；The power harvester is used to gather generating set
Power output signal；The server is used to obtain power output signal described in the electric current summation, and according to the electric current
The corresponding relation of summation and the power output signal whether in normal range (NR), if compare draw the electric current summation with it is described
The corresponding relation of power output signal then produces alarm signal alarm not in normal range (NR), passes through what is be connected with the server
Alarm is alarmed to remind relevant staff to take corresponding measure in time.
In normal production process, unit can ensure that the generated output of generator is more steady, works as rotor as far as possible
When short-circuit, excitation output drop, system can automatically increase exciting current according to feedback signal.Ideally：If can be real
When collect exciting current signal and (be set to I0) and generating set power parameter (be set to P0), longitudinal comparison operational factor and experiment
Data, it can effectively judge whether generating set has short circuit phenomenon.But it is unstable between carbon brush and slip ring that actual conditions, which are,
, the generation of curent change is also unstable, as current parameters I0When changing, it is that rotor is short that data, which not can be shown that,
What the unstability of road or carbon brush friction triggered.
The application is using the current parameters for gathering each carbon brush in real time, exciting current I0It is exactly the electricity of all carbon brush of the unit
Flow summation.Influence of the change to current parameters of carbon brush inherent parameters can be evaded completely in this way, gathered in real time
Carbon brush current parameters are real-time changes, but if Parameters variation caused by the short circuit of rotor, the change of carbon brush parameter must
Surely it is synchronous into relationship change, now longitudinal comparison experimental data and feature operational factor I again0、P0Relation, be exactly effectively
Characteristic parameter analysis compared for, can just be contrasted and noted abnormalities by Partial Feature Parameter analysis in the problem budding period, and energy
Shi Youxiao takes measures to control failure to continue to develop and eliminate the respective handling countermeasure of failure, realizes and is overhauled after traditional accident
It is changed into preventative repair based on condition of component.
Also, the error concealment unit is the realization in synchronized sampling.When the system also includes a wireless synchronization
Clock unit, for controlling dozens of carbon brush current collector and power harvester gathered with the cycle, in the base of synchronized sampling
On plinth, the individual interference that multiple carbon brush are come due to the different band of physically and electrically characteristic could be eliminated, show that reflection is overall effective
The accurate picture of the real-time change of exciting current.According to the current signal feature of all carbon brush got, generating set is judged
The current signals of all carbon brush whether be in synchronous variation relation, if judge wherein the current signal of some or several carbon brush with
Other all carbon brush be not it is synchronous into relationship change when, then record pair of presently described electric current summation and the power output signal
It is carbon brush failure that abnormal cause, which should be related to,.
The server is provided with a synchronised clock unit, for controlling the current collector and the power collecting
Device carries out synchronous data sampling.Carbon brush electric current summation I0With the outlet power P of generator0It is real-time change, if none of
Unified clock and same sampling period, then the data of collection are not contrast meaning in theory.When synchronous
Clock can be by the real-time communication of server and generating set power sampling table in T0Gathered data P0；By background server with
The communication of front end data acquisition device, in moment T0The current parameters of front end sensors are gathered, have passed through cycle T1Sample again afterwards,
Can so ensure each group collection data on ageing attribute be it is consistent, post analysis processing just it is meaningful.
In addition, the system also includes the repeater being connected between the front end data acquisition device and server, in described
Cached after device with the electric current of the carbon brush for receiving.The data of front end data acquisition device collection are relatively more, if directly
Access background server can increase the caching burden of server, and the order transmission of background server is also more numerous and diverse；In data set
The presence of device with the order transfer of buffer-stored, system, while can will can also realize logout, data in data set
The functions such as lateral transport.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with
The present invention is described in detail good embodiment, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent substitution, and without departing from the objective and scope of technical solution of the present invention, it all should cover at this
Among the right of invention.
Claims (5)
1. a kind of electric generating set rotor short circuit on-line monitoring system based on exciter current of generator synchronized sampling, its feature exist
In, including carbon brush current acquisition unit, front end data acquisition device, server and power harvester and the wireless synchronization being sequentially connected
Clock unit；
The carbon brush current acquisition unit includes some and one-to-one current collector of carbon brush, and the current collector is used for
The current signal of the single carbon brush of generating set is gathered respectively；
The front end data acquisition device is used for the current signal for obtaining the carbon brush that all current collectors are collected, and obtains
The electric current summation of all carbon brush of the unit and the exciting current characteristic of single carbon brush；
The power harvester is used for the real-time output electrical parameter for gathering generator；
Server is used to handle the exciting current characteristic and the corresponding relation of generator output electrical parameter, if exciting current characteristic
Alarm signal is then sent with the real-time corresponding relation of output electrical parameter extremely；
The wireless synchronization clock unit, for controlling the carbon brush current collector and power harvester adopted with the cycle
Collection.
2. the electric generating set rotor short circuit on-line monitoring according to claim 1 based on exciter current of generator synchronized sampling
System, it is characterised in that the server also includes error concealment unit；The error concealment unit is the base in synchronized sampling
The current signal feature according to all carbon brush synchronously got realized on plinth, eliminating the basis of indivedual carbon brush difference interference
On, the total exciting current characteristic drawn is actually used for the electric current of generator amature excitation, in generator normal work, effectively
Exciting current characteristic parameter and generator output electrical parameter have normal corresponding relation curve, are such as broken down in generator, should
Homologous thread can deviate, so as to find generator failure in time.
3. the electric generating set rotor short circuit on-line monitoring according to claim 1 based on exciter current of generator synchronized sampling
System, it is characterised in that the current collector is closed-loop Hall current sensor.
4. the electric generating set rotor short circuit on-line monitoring according to claim 1 based on exciter current of generator synchronized sampling
System, it is characterised in that the system also includes the alarm being connected with the server, and the alarm is used for according to the clothes
Alarm signal caused by business device is alarmed.
5. the electric generating set rotor short circuit on-line monitoring according to claim 1 based on exciter current of generator synchronized sampling
System, it is characterised in that the system also includes the repeater being connected between the front end data acquisition device and server, described
Repeater is cached with the electric current of the carbon brush for receiving.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711041312.7A CN107861062B (en) | 2017-10-30 | 2017-10-30 | Electric generating set rotor short circuit on-line monitoring system based on exciter current of generator synchronized sampling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711041312.7A CN107861062B (en) | 2017-10-30 | 2017-10-30 | Electric generating set rotor short circuit on-line monitoring system based on exciter current of generator synchronized sampling |
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| CN107861062A true CN107861062A (en) | 2018-03-30 |
| CN107861062B CN107861062B (en) | 2019-10-22 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188047A (en) * | 2018-07-10 | 2019-01-11 | 长沙国通电力科技有限公司 | A kind of measuring device of brushless excitation generator exciting current |
| CN110082589A (en) * | 2019-06-26 | 2019-08-02 | 潍柴动力股份有限公司 | A kind of generator power test macro and method |
| CN110542856A (en) * | 2019-08-28 | 2019-12-06 | 福建福清核电有限公司 | offline testing system and method for generator rotor grounding protection carbon brush device |
| CN112098835A (en) * | 2020-08-07 | 2020-12-18 | 国家能源集团山东石横热电有限公司 | Remote real-time monitoring system for excitation carbon brush of generator |
| WO2021219962A2 (en) | 2020-04-30 | 2021-11-04 | Mersen France Amiens Sas | Current sensor device and method for assembling such a device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109188047A (en) * | 2018-07-10 | 2019-01-11 | 长沙国通电力科技有限公司 | A kind of measuring device of brushless excitation generator exciting current |
| CN110082589A (en) * | 2019-06-26 | 2019-08-02 | 潍柴动力股份有限公司 | A kind of generator power test macro and method |
| CN110542856A (en) * | 2019-08-28 | 2019-12-06 | 福建福清核电有限公司 | offline testing system and method for generator rotor grounding protection carbon brush device |
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| WO2021219962A2 (en) | 2020-04-30 | 2021-11-04 | Mersen France Amiens Sas | Current sensor device and method for assembling such a device |
| US11913975B2 (en) | 2020-04-30 | 2024-02-27 | Mersen France Amiens Sas | Current sensor device and method for assembling such a device |
| CN112098835A (en) * | 2020-08-07 | 2020-12-18 | 国家能源集团山东石横热电有限公司 | Remote real-time monitoring system for excitation carbon brush of generator |
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| CN107861062B (en) | 2019-10-22 |
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