CN105242186A - Generator rotor earth fault detection system - Google Patents
Generator rotor earth fault detection system Download PDFInfo
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- CN105242186A CN105242186A CN201510741838.0A CN201510741838A CN105242186A CN 105242186 A CN105242186 A CN 105242186A CN 201510741838 A CN201510741838 A CN 201510741838A CN 105242186 A CN105242186 A CN 105242186A
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- rotor
- brush
- slip ring
- generator
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Abstract
The invention discloses a generator rotor earth fault detection system, comprising a brush lifting mechanism, a rotor body and a rotor earth protective device, wherein the brush lifting mechanism comprises brush bases, each brush base is provided with a sunken portion, a carbon brush suitable for guiding rotor current needed by operation of a generator to a rotor coil through a connecting sheet on a slip ring of the rotor body is arranged in the sunken portion, and the carbon brush is a sliding contact body for conducting current; the rotor body is provided with slip rings in contact with the carbon brushes, and the slip rings comprise a positive slip ring, a negative slip ring and an earth slip ring; the rotor earth protective device is suitable for being connected with an alternating current injected power supply, so that the carbon brushes of the brush lifting mechanism leave the sunken portions of the brush bases, are lifted upwards and contact the slip rings of the rotor body; meanwhile, an insulating mat is arranged between each pair of brush base and carbon brush of the brush lifting mechanism; and a 2.5-3.5 kilo-ohms resistor is further connected between each pair of brush base and carbon brush. The generator rotor earth fault detection system can be used for detecting the generator rotor earth insulation condition, and simultaneously can solve the measurement problem when the brush lifting mechanism fails.
Description
Technical field
The invention belongs to electrical generator fields, be specifically related to a kind of generator rotor ground malfunction detection system.
Background technology
Generator is primarily of parts compositions such as rotor, inner stator, external stator, hydrogen coolers.Wherein, described generator amature forms with alloy steel solid forging, the principle of work of generator amature is: the hot hydrogen between rotor and stator released by the fan of rotation, send into the refrigeratory at two ends, be divided into two-way from refrigeratory cold hydrogen out, a road is through rotor winding, to cooling after get back between rotor and stator gap in, another road, through stator core cooling, is then also got back in the gap between rotor and stator, then by fan, hot hydrogen is delivered to refrigeratory.
The formation of generator excited system and principle of work are: existing turbodynamo have employed three machine formula brushless excitation systems, and the major equipment of excitation system comprises main exciter, pilot exciter, rotating rectifier, automatic exciting regulator and field suppression equipment.Wherein, the armature of main exciter, diode rectifier and pilot exciter rotor are all rotary part (being placed in the rotating shaft of exciter), rotate during operation with generator amature; The output of rectifier is directly received on generator excitation winding, need not through carbon brush and slip ring.
Main exciter is a revolving armature type alternator, and its field copper is contained on stator, and armature is contained in rotating shaft, the field copper of the alternating current that armature sends supply generator after rotating rectifier rectification.Pilot exciter is a magneto, and permanent magnetism magnetic pole is contained in rotating shaft, and the alternating current that stator sends, after silicon controlled rectifier rectification, supplies the field copper of main exciter.
Under normal operation, the adjustment of field excitation of generator is undertaken by automatic exciting regulator, and the voltage and current signal of generator is caused automatic exciting regulator by the voltage transformer (VT) summation current transformer being connected on generator end.When generator voltage and reactive power change, the change of these voltages and power measured by regulator, the pilot angle of silicon controlled rectifier is changed by the control loop of regulator, silicon controlled output current (i.e. the exciting current of main exciter) is changed, correspondingly change the output current (exciter current of generator) of main exciter, thus play the effect of automatic regulator generator terminal voltage and idle output.Such as, increase when generator reactive exports, when causing generator voltage to decline, regulator control loop makes SCR control angle reduce, and controllable silicon exports to be increased, and exciter current of generator increases, and generator voltage gos up, and is finally stabilized in given level.When generator voltage raises, the effect of regulator is contrary.
When electric system generation suddenly-applied short circuit or sudden increase in load, generator voltage declines suddenly and stator current increases suddenly, and regulator control loop makes silicon controlled pilot angle reduce rapidly, and controllable silicon is in Full-open state, carries out automatic field forcing to generator.During generator losing load, terminal voltage raises suddenly, and control loop makes SCR control angle increase rapidly, and controllable silicon is in inverter mode, carries out demagnetize thus effectively suppress the voltage of generator to raise by force to generator.
When there is internal fault in generator; corresponding protection act; controllable silicon is made to be in inverter mode by control loop; main exciter exciting current declines rapidly; field suppression equipment action subsequently; by controllable silicon output loop cut off and by the field copper short circuit of main exciter on de-excitation resistance, exciting current finally drops to zero gradually.
But the present inventor finds, in existing generator, also do not have the situation of scheme to generator rotor ground to relate to, thus judge the insulation situation of generator amature through research.
Summary of the invention
Relate to for the situation not having scheme to generator rotor ground in prior art, thus to the technical matters that the insulation situation of generator amature judges, the invention provides a kind of generator rotor ground malfunction detection system, this system can monitor the situation of generator rotor insulation preferably.
To achieve these goals, the present invention adopts following technical scheme:
A kind of generator rotor ground malfunction detection system, comprise Ju Shua mechanism, rotor body and rotor ground protection device, described Ju Shua mechanism comprises brush holder, described brush holder is provided with depressed part, be provided with in described depressed part and be suitable for the rotor current required for generator operation by importing the carbon brush of rotor winding with the brace on rotor body slip ring, described carbon brush is the sliding contact body of conduction current; Described rotor body is provided with the slip ring that can contact with described carbon brush, and described slip ring comprises positive pole slip ring, negative pole slip ring and ground connection slip ring; Described rotor ground protection device is suitable for injecting power supply with interchange and is connected; the depressed part that the carbon brush of Shi Jushua mechanism leaves brush holder upwards lifts; and contact with the slip ring of rotor body; between every a pair brush holder and carbon brush of described Ju Shua mechanism, be provided with insulating mat simultaneously, and also connect the resistance of a 2.5-3.5K Ω between described every a pair brush holder and carbon brush.
Generator rotor ground malfunction detection system provided by the invention, can detect the insulation situation of generator rotor ground, can solving because lifting brush mechanism-trouble simultaneously, causing measuring the technical matters that there is inaccuracy.
Further, the resistance of described resistance is 3.3K Ω.
Accompanying drawing explanation
Fig. 1 is the partial structurtes schematic diagram of generator rotor ground malfunction detection system provided by the invention.
In figure, 11, carbon brush; 21, slip ring.
Embodiment
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the present invention further.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
Please refer to shown in Fig. 1, the present invention discloses a kind of generator rotor ground malfunction detection system, comprise Ju Shua mechanism, rotor body and rotor ground protection device, described Ju Shua mechanism comprises brush holder, described brush holder is provided with depressed part, be provided with in described depressed part and be suitable for the rotor current required for generator operation by importing the carbon brush 11 of rotor winding with the brace on rotor body slip ring, described carbon brush 11 is sliding contact bodies of conduction current; Described rotor body is provided with the slip ring 21 that can contact with described carbon brush 11, and described slip ring 21 comprises positive pole slip ring, negative pole slip ring and ground connection slip ring; Described rotor ground protection device is suitable for injecting power supply with interchange and is connected; the depressed part that the carbon brush 11 of Shi Jushua mechanism leaves brush holder upwards lifts; and contact with the slip ring 21 of rotor body; between every a pair brush holder and carbon brush 11 of described Ju Shua mechanism, be provided with insulating mat simultaneously, and also connect the resistance of a 2.5-3.5K Ω between described every a pair brush holder and carbon brush 11.Generator rotor ground malfunction detection system provided by the invention, can detect the insulation situation of generator rotor ground, can solving because lifting brush mechanism-trouble simultaneously, causing measuring the technical matters that there is inaccuracy.
As specific embodiment, because described Ju Shua mechanism may exist fault, there is short circuit in brush holder and the carbon brush of such as Ju Shua mechanism, carbon brush is caused upwards not lift, now described carbon brush can continue to stay in the depressed part of Ju Shua mechanism, direct and brush holder is connected to form short circuit (carbon brush and brush holder are all metal manufacture), finally causes measurement inaccurate; And the present invention increases insulating mat between every a pair brush holder and carbon brush of described Ju Shua mechanism, between described every a pair brush holder and carbon brush, also connect the resistance of a 2.5-3.5K Ω simultaneously, can solving thus because lifting brush mechanism-trouble, causing measuring the technical matters that there is inaccuracy.
During generator rotor ground protection provided by the invention; what rotor ground protection device adopted is exchange injecting principle; the AC compounent injected forms loop through the major insulation of generator amature; by the voltage and current of injected frequency in measuring circuit; calculate common resistive component, to judge the quality of generator rotor insulation.Particularly, exchange and inject power supply and be connected with described rotor ground protection device, the depressed part that three carbon brush of Shi Jushua mechanism leave brush holder upwards lifts, and contacts with three slip rings of rotor body, and wherein three carbon brush contact with three slip rings are corresponding; And described positive pole slip ring and negative pole slip ring can be equivalent when ignoring rotor impedance, the carbon brush that therefore both positive and negative polarity slip ring is corresponding only has a wiring, and the negative pole that ground connection slip ring then injects power supply with rotor earth fault protection is connected.By voltage and current contact corresponding on described rotor ground protection device, measure rotor insulation resistance R
fthe voltage U at (virtual) two ends and electric current I, according to
calculate corresponding rotor main insulation resistance R
f.On the basis that foregoing rotor earth protective device principle of work is introduced, those skilled in the art can need according to this rotor ground protection device designing different structure, as long as can realize above-mentioned functions, are therefore no longer described in detail.
According to R
fcriterion, if R
fbe greater than 4K Ω, then illustrate that rotor insulation is normal; If R
fbe greater than 2K Ω and be less than 4K Ω, warning will be sent and cause concern; If R
fbe less than 2K Ω, then illustrate that rotor insulation can not accept, namely illustrating between described rotor winding and rotating shaft may short circuit, and device will send existing chaser signal.
If the rotor main insulation resistance R calculated
fnewly increasing near the resistance of resistance, namely at 2.5-3.5K about Ω, then may illustrate that not rotor insulation is bad, but lift brush mechanism-trouble, carbon brush could not upwards lift.Concrete reason is: the Ju Shua mechanism of control system of the present invention adds insulating mat between described brush holder and carbon brush, there will not be short circuit between described brush holder and carbon brush; Meanwhile, described rotor main insulation resistance R
fresistance be not again be less than 2K Ω, false tripping unit can not be caused; Just in time; when described carbon brush could not upwards lift owing to lifting brush mechanism-trouble; in described rotor earth fault protection measuring circuit; the voltage and current value at what on rotor ground protection device, corresponding contact recorded is just in time described newly-increased resistance two ends, the resistance value therefore calculated with increase resistance approximately equal.Therefore, new departure provided by the invention can detect the insulation situation of generator rotor ground, can be used for judging the fault of described Ju Shua mechanism simultaneously.
As specific embodiment, the resistance of described newly-increased resistance is 3.3K Ω, warning can be sent when lifting brush mechanism-trouble and cause concern, simultaneously can not false tripping unit, and can judge fast according to device record result when lifting brush mechanism-trouble, better can monitor the situation of generator rotor insulation thus, avoid the loss causing generator maloperation to cause owing to lifting brush mechanism-trouble.
These are only embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure utilizing instructions of the present invention and accompanying drawing content to do, is directly or indirectly used in the technical field that other are relevant, all in like manner within scope of patent protection of the present invention.
Claims (2)
1. a generator rotor ground malfunction detection system, it is characterized in that, comprise Ju Shua mechanism, rotor body and rotor ground protection device, described Ju Shua mechanism comprises brush holder, described brush holder is provided with depressed part, be provided with in described depressed part and be suitable for the rotor current required for generator operation by importing the carbon brush of rotor winding with the brace on rotor body slip ring, described carbon brush is the sliding contact body of conduction current; Described rotor body is provided with the slip ring that can contact with described carbon brush, and described slip ring comprises positive pole slip ring, negative pole slip ring and ground connection slip ring; Described rotor ground protection device is suitable for injecting power supply with interchange and is connected; the depressed part that the carbon brush of Shi Jushua mechanism leaves brush holder upwards lifts; and contact with the slip ring of rotor body; between every a pair brush holder and carbon brush of described Ju Shua mechanism, be provided with insulating mat simultaneously, and also connect the resistance of a 2.5-3.5K Ω between described every a pair brush holder and carbon brush.
2. generator rotor ground malfunction detection system according to claim 1, is characterized in that, the resistance of described resistance is 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 |
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| Publication Number | Publication Date |
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| CN105242186A true CN105242186A (en) | 2016-01-13 |
| CN105242186B 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 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429740A (en) * | 2019-08-28 | 2019-11-08 | 福建福清核电有限公司 | A kind of dust-protection type generator rotor insulation monitoring brushgear |
| 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 |
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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429740A (en) * | 2019-08-28 | 2019-11-08 | 福建福清核电有限公司 | A kind of dust-protection type generator rotor insulation monitoring brushgear |
| 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 |
| 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 |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN105242186B (en) | 2018-06-01 |
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| C06 | Publication | ||
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| CB03 | Change of inventor or designer information |
Inventor after: Mu Wei Inventor after: Liu Chunhua Inventor before: Fu Qiang |
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| 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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| 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 |