CN105242186B - A kind of generator rotor ground malfunction detection system - Google Patents
A kind of generator rotor ground malfunction detection system Download PDFInfo
- Publication number
- CN105242186B CN105242186B CN201510741838.0A CN201510741838A CN105242186B CN 105242186 B CN105242186 B CN 105242186B CN 201510741838 A CN201510741838 A CN 201510741838A CN 105242186 B CN105242186 B CN 105242186B
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- rotor
- slip ring
- brush
- carbon brush
- generator
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Abstract
The present invention discloses a kind of generator rotor ground malfunction detection system; including Ju Shua mechanisms, rotor body and rotor ground protection device; Ju Shua mechanisms include brush holder; recessed portion is provided on brush holder; it is equipped with and is suitable for the required rotor current of generator operation through the carbon brush with the connection sheet importing rotor coil on rotor body slip ring in recessed portion, carbon brush is the sliding contact body for conducting electric current；Rotor body is equipped with the slip ring that can be contacted with the carbon brush, and slip ring includes anode slip ring, cathode slip ring and ground connection slip ring；Rotor ground protection device is suitable for exchanging supply-injected connection; the recessed portion that the carbon brush of Shi Jushua mechanisms leaves brush holder lifts upwards; and it is contacted with the slip ring of rotor body; felt pad is equipped between every a pair of of the brush holder and carbon brush of Ju Shua mechanisms simultaneously, and the resistance of a 2.5 3.5K Ω is also connected between every a pair of of brush holder and carbon brush.The present invention can detect the insulation situation of generator rotor ground, while can solve the problems, such as the measurement because lifting brush mechanism-trouble.
Description
Technical field
The invention belongs to electrical generator fields, and in particular to a kind of generator rotor ground malfunction detection system.
Background technology
Generator is mainly made of components such as rotor, inner stator, external stator, hydrogen coolers.Wherein, the generator turns
Son is formed with steel alloy solid forging, and the operation principle of generator amature is：The fan of rotation is between rotor and stator
Hot hydrogen is released, and is sent into the cooler at both ends, and the cold hydrogen come out from cooler is divided into two-way, all the way through rotor coil,
To cooling after return in the gap between rotor and stator, another way through stator core cool down, then also return to rotor with
In gap between stator, then by fan hot hydrogen is sent to cooler.
The composition and operation principle of generator excited system be：Existing steam turbine generator employs three machine formula brushless excitation systems
System, the capital equipment of excitation system include main exciter, pilot exciter, rotating rectifier, automatic exciting regulator and demagnetization dress
It puts.Wherein, the armature of main exciter, diode rectifier and pilot exciter rotor are all that rotary part (is placed in exciter
In shaft), when operation, rotates with generator amature；The output of rectifier is directly connected on generator excitation winding, it is not necessary to
By carbon brush and slip ring.
Main exciter is a revolving armature type alternator, and on stator, armature is mounted in shaft Exciting Windings for Transverse Differential Protection,
The Exciting Windings for Transverse Differential Protection of the alternating current that armature is sent supply generator after rotating rectifier rectification.Pilot exciter is a permanent magnet generator
Machine, for permanent magnetism magnetic pole in shaft, the alternating current that stator is sent supplies encouraging for main exciter after silicon controlled rectifier (SCR) rectification
Magnetic winding.
Under normal operation, the adjustment of field excitation of generator is carried out by automatic exciting regulator, is connected on generator
The voltage and current signal of generator is led to automatic exciting regulator by the voltage transformer and current transformer at end.Work as generator
When terminal voltage and reactive power change, adjuster measures the variation of these voltages and power, passes through the control of adjuster
Circuit changes the pilot angle of silicon controlled rectifier (SCR), changes silicon-controlled output current (i.e. the exciting current of main exciter), phase
Change the output current (exciter current of generator) of main exciter with answering, so as to play automatic adjustment generator voltage and nothing
The effect of work(output.For example, when generator reactive output increases, when causing the generator voltage to decline, adjuster control loop makes
SCR control angle reduces, and silicon-controlled output increases, and exciter current of generator increase, generator voltage gos up, and finally stablizes
Given level.When generator voltage raises, the effect of adjuster is opposite.
When suddenly-applied short circuit or sudden increase in load occur for electric system, generator voltage declines suddenly and stator current is unexpected
Increase, adjuster control loop is reduced rapidly silicon-controlled pilot angle, silicon-controlled in Full-open state, and generator is carried out
Automatic field forcing.During generator losing load, terminal voltage raises suddenly, and control loop makes SCR control angle increase rapidly, silicon-controlled
In inverter mode, subtracted magnetic by force to generator so as to effectively inhibit the rise of the voltage of generator.
When there is internal fault in generator, corresponding protection act, made by control loop it is silicon-controlled in inverter mode,
Main exciter exciting current declines rapidly, the action of subsequent field suppression equipment, silicon-controlled output loop is cut off and by main exciter
For Exciting Windings for Transverse Differential Protection short circuit on de-excitation resistance, exciting current finally gradually decreases down zero.
But the present inventor is by the study found that in existing generator, there are no scheme to generator amature
The situation of ground connection is related to, so as to judge the insulation situation of generator amature.
The content of the invention
The situation of generator rotor ground is related to for no scheme in the prior art, so as to generator amature
Insulation situation the technical issues of being judged, the present invention provides a kind of generator rotor ground malfunction detection system, the system
The situation of generator rotor insulation can preferably be monitored.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of generator rotor ground malfunction detection system is filled including Ju Shua mechanisms, rotor body and rotor earth fault protection
It puts, the Ju Shua mechanisms include brush holder, and recessed portion is provided on the brush holder, is equipped with and is suitable for generator in the recessed portion
Required rotor current is run by the carbon brush with the connection sheet importing rotor coil on rotor body slip ring, the carbon brush is
Conduct the sliding contact body of electric current；The rotor body is equipped with the slip ring that can be contacted with the carbon brush, and the slip ring is included just
Pole slip ring, cathode slip ring and ground connection slip ring；The rotor ground protection device is suitable for and exchanges supply-injected connection, makes act brush machine
The recessed portion that the carbon brush of structure leaves brush holder lifts upwards, and is contacted with the slip ring of rotor body, while in the Ju Shua mechanisms
Per between a pair of brush holder and carbon brush a 2.5-3.5K is also connected with per between a pair of of brush holder and carbon brush equipped with felt pad, and described
The resistance of Ω.
Generator rotor ground malfunction detection system provided by the invention, can be to the insulation situation of generator rotor ground
It is detected, while can solve, because lifting brush mechanism-trouble, measurement to be caused to there is technical issues that.
Further, the resistance value of the resistance is 3.3K Ω.
Description of the drawings
Fig. 1 is the partial structural diagram of generator rotor ground malfunction detection system provided by the invention.
In figure, 11, carbon brush；21st, slip ring.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Conjunction is specifically illustrating, and the present invention is further explained.
In the description of the present invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or be integrally connected；It can
To be mechanical connection or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
Shown in please referring to Fig.1, the present invention discloses a kind of generator rotor ground malfunction detection system, including Ju Shua mechanisms,
Rotor body and rotor ground protection device, the Ju Shua mechanisms include brush holder, recessed portion are provided on the brush holder, described
It is equipped with and is suitable for the required rotor current of generator operation by being imported with the connection sheet on rotor body slip ring in recessed portion
The carbon brush 11 of rotor coil, the carbon brush 11 are the sliding contact bodies for conducting electric current；The rotor body be equipped with can with it is described
The slip ring 21 that carbon brush 11 contacts, the slip ring 21 include anode slip ring, cathode slip ring and ground connection slip ring；The rotor earth fault protection
Device is suitable for and exchange supply-injected connection, and the recessed portion that the carbon brush 11 of Shi Jushua mechanisms leaves brush holder lifts upwards, and with turn
The slip ring 21 of sub- body contacts, while felt pad is equipped between every a pair of of the brush holder and carbon brush 11 of the Ju Shua mechanisms, and
The resistance of a 2.5-3.5K Ω is also connected between every a pair of of brush holder and carbon brush 11.Generator amature provided by the invention connects
Earth fault detection system can detect the insulation situation of generator rotor ground, while can solve because of Ju Shua mechanisms
Failure causes measurement there is technical issues that.
As specific embodiment, since the Ju Shua mechanisms may there are the brush holders and carbon of failure, such as Ju Shua mechanisms
There is short circuit in brush, cause carbon brush that cannot lift upwards, the carbon brush may proceed to stay in the recessed portion of Ju Shua mechanisms at this time, directly
It is connected to form short circuit (carbon brush and brush holder all manufacture for metal) with brush holder, it is inaccurate to ultimately result in measurement；And the present invention is described
Increase felt pad between every a pair of of the brush holder and carbon brush of Ju Shua mechanisms, while be also connected with described per between a pair of of brush holder and carbon brush
The resistance of one 2.5-3.5K Ω, it is possible thereby to solve, because lifting brush mechanism-trouble, measurement to be caused to ask there are the technology of inaccuracy
Topic.
During generator rotor ground protection provided by the invention, rotor ground protection device is injected using exchange
Principle, the AC compounent of injection are formed into a loop by the major insulation of generator amature, pass through the electricity of injected frequency in measuring loop
Pressure and electric current, to calculate common resistive component, to judge the quality of generator rotor insulation.Specifically, supply-injected and institute is exchanged
Rotor ground protection device connection is stated, the recessed portion that three carbon brush of Shi Jushua mechanisms leave brush holder lifts upwards, and and rotor
Three slip rings contact of body, wherein three carbon brush with three slip rings are corresponding contacts；And the anode slip ring and cathode slip ring exist
Can be equivalent in the case of ignoring rotor impedance, therefore wiring there are one the corresponding carbon brush of positive and negative anodes slip ring, and be grounded and slide
Then the cathode supply-injected with rotor earth fault protection is connected ring.Pass through corresponding voltage and electricity on the rotor ground protection device
Contact is flowed, measures rotor insulation resistance Rf(virtually) voltage U at both ends and electric current I, according toIt calculates
Corresponding rotor insulation resistance of main Rf.On the basis of the introduction of foregoing rotor earth protective device operation principle, art technology
Personnel can design the rotor ground protection device of different structure according to the needs, as long as above-mentioned function can be realized,
Therefore no longer it is described in detail.
According to RfCriterion, if RfMore than 4K Ω, then illustrate that rotor insulation is normal；If RfIt is less than more than 2K Ω
4K Ω, it will send alarm and cause concern；If RfLess than 2K Ω, then illustrate that rotor insulation cannot receive, i.e., described in explanation
May be short-circuit between rotor coil and shaft, device will send existing chaser signal.
If the rotor insulation resistance of main R calculatedfIt is near the resistance value for newly increasing resistance, i.e., left in 2.5-3.5K Ω
The right side may then illustrate not to be that rotor insulation is bad, but lift brush mechanism-trouble, and carbon brush could not lift upwards.Concrete reason is：This
The Ju Shua mechanisms of invention control system add felt pad between the brush holder and carbon brush, between the brush holder and carbon brush
It is not in short circuit；Meanwhile the rotor insulation resistance of main RfResistance value again be not less than 2K Ω, false tripping unit will not be caused；
Just, when the carbon brush could not lift upwards due to lifting brush mechanism-trouble, in the rotor earth fault protection measuring loop, rotor
The voltage and current value at the exactly newly-increased resistance both ends that corresponding contact measures on earth protective device, therefore calculate
Resistance value and increase resistance approximately equal.Therefore, new departure provided by the invention can be to generator rotor ground
Insulation situation detected, while can be used for judging the failures of the Ju Shua mechanisms.
As specific embodiment, the resistance value of the newly-increased resistance is 3.3K Ω, and report can be sent when lifting brush mechanism-trouble
It is alert to cause concern, at the same will not false tripping unit, and can quickly be judged according to device record result when lifting brush mechanism-trouble,
It is possible thereby to more preferably monitor the situation of generator rotor insulation, avoid damaging caused by lifting brush mechanism-trouble and causing generator maloperation
It loses.
It these are only embodiments of the present invention, be not intended to limit the scope of the invention, it is every to utilize the present invention
The equivalent structure that specification and accompanying drawing content are made directly or indirectly is used in other related technical areas, similarly at this
Within the scope of patent protection of invention.
Claims (1)
1. a kind of generator rotor ground malfunction detection system, which is characterized in that connect including Ju Shua mechanisms, rotor body and rotor
Ground protective device, the Ju Shua mechanisms include brush holder, and recessed portion is provided on the brush holder, is equipped with and is suitable in the recessed portion
The required rotor current of generator operation is passed through the carbon brush with the connection sheet importing rotor coil on rotor body slip ring, institute
It is the sliding contact body for conducting electric current to state carbon brush；The rotor body is equipped with the slip ring that can be contacted with the carbon brush, the cunning
Ring includes anode slip ring, cathode slip ring and ground connection slip ring；The rotor ground protection device is suitable for exchanging supply-injected connection,
The recessed portion that the carbon brush of Shi Jushua mechanisms leaves brush holder lifts upwards, and is contacted with the slip ring of rotor body, while in the act
Brush mechanism is also connected with one equipped with felt pad, and described per between a pair of of brush holder and carbon brush per between a pair of of brush holder and carbon brush
The resistance of 3.3K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510741838.0A CN105242186B (en) | 2015-11-03 | 2015-11-03 | A kind of generator rotor ground malfunction detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510741838.0A CN105242186B (en) | 2015-11-03 | 2015-11-03 | A kind of generator rotor ground malfunction detection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105242186A CN105242186A (en) | 2016-01-13 |
| CN105242186B true CN105242186B (en) | 2018-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510741838.0A Expired - Fee Related CN105242186B (en) | 2015-11-03 | 2015-11-03 | A kind of generator rotor ground malfunction detection system |
Country Status (1)
| Country | Link |
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| CN (1) | CN105242186B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429740B (en) * | 2019-08-28 | 2024-04-09 | 福建福清核电有限公司 | Dustproof generator rotor insulation monitoring brush device |
| CN110542856B (en) * | 2019-08-28 | 2021-06-22 | 福建福清核电有限公司 | Offline testing system and method for generator rotor grounding protection carbon brush device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2309013Y (en) * | 1997-09-03 | 1999-02-24 | 曾一峰 | Brushless excitation device of synchro generator |
| US7095243B1 (en) * | 2005-07-11 | 2006-08-22 | Honeywell International, Inc. | AC generator exciter rotor slip-ring test apparatus |
| CN104007386A (en) * | 2014-05-28 | 2014-08-27 | 中广核核电运营有限公司 | Comprehensive offline test platform of generator rotor insulation measurement device |
| CN104577614A (en) * | 2014-11-25 | 2015-04-29 | 杨显清 | Insulated carbon brush, bush holder comprising insulated carbon brush and excitation system comprising brush holder |
-
2015
- 2015-11-03 CN CN201510741838.0A patent/CN105242186B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2309013Y (en) * | 1997-09-03 | 1999-02-24 | 曾一峰 | Brushless excitation device of synchro generator |
| US7095243B1 (en) * | 2005-07-11 | 2006-08-22 | Honeywell International, Inc. | AC generator exciter rotor slip-ring test apparatus |
| CN104007386A (en) * | 2014-05-28 | 2014-08-27 | 中广核核电运营有限公司 | Comprehensive offline test platform of generator rotor insulation measurement device |
| CN104577614A (en) * | 2014-11-25 | 2015-04-29 | 杨显清 | Insulated carbon brush, bush holder comprising insulated carbon brush and excitation system comprising brush holder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105242186A (en) | 2016-01-13 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Mu Wei Inventor after: Liu Chunhua Inventor before: Fu Qiang |
|
| CB03 | Change of inventor or designer information | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20180428 Address after: 226400 the southern side of the Yellow River road and the west side of Jinggang Mountain Road, Rudong County, Nantong, Jiangsu. Applicant after: Nantong Shengze Energy Technology Co., Ltd. Address before: 400714 Chongqing Beibei district water and soil Town Wanshou Industrial Park Applicant before: Chongqing Tongsai Electromechanical Co., Ltd. |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180601 Termination date: 20201103 |
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| CF01 | Termination of patent right due to non-payment of annual fee |