CN1004941B - Determining testing vibration method and apparatus for the generating set in a power station - Google Patents
Determining testing vibration method and apparatus for the generating set in a power station Download PDFInfo
- Publication number
- CN1004941B CN1004941B CN85109518.6A CN85109518A CN1004941B CN 1004941 B CN1004941 B CN 1004941B CN 85109518 A CN85109518 A CN 85109518A CN 1004941 B CN1004941 B CN 1004941B
- Authority
- CN
- China
- Prior art keywords
- phase
- generator unit
- vibro
- pickup
- pick
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Images
Landscapes
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
The present invention relates to a power station generator set torsional vibration testing method and equipment correlator of machine turning vibration test. Any phase of a generator or a transformer is loaded and then grounded, or any two phases are loaded so as to serve as the excitation means. The vibration pickup method adopts two vibration pickups, signals picked up are accessed to a correlator, and the signals are modulated, processed in a phase adding mode and transmitted to a torsiometer to be displayed through the correlator. The testing method and the special-purpose equipment have the advantages that the testing method and the special-purpose equipment can reduce negative sequence current, can ensure the safety of the generator set, and can eliminate bending vibration ingredients so as to obtain pure torsional vibration signals; the lowest measurable frequency is about 15Hz.
Description
The present invention relates to the machine rotors vibration test, relate more specifically to a kind of plant generator unit determining testing vibration method and equipment correlator.
The security of turbine blade for many years only considers that its low-frequency vibration need avoid the integral multiple of rotating speed, dither need be avoided the excited frequency of nozzle, but recent many data show, under certain conditions, the torsional oscillation of the unit rotor-support-foundation system that causes owing to the power transmission network fault produces higher dynamic stress, even can cause the strength weak link of unit, for example the shaft coupling between generator and the steam turbine cuts off, thereby cause a serious accident and cause that the steam turbine driving interrupts blade, produce heavy economic losses.Therefore the test to plant generator unit torsional oscillation is very important, and substantial economics is arranged again.
When doing on-the-spot torsional test is to utilize generator as exciting source, and basic means is to make generator bear asymmetric load.When generator when bearing asymmetric load, by negative phase-sequence air-gap rotating magnetic field and the excitatory magnetic potential of rotor, and the alternating electromagnetism moment that is twice in rotating speed that is produced by positive sequence air-gap rotating magnetic field and stator negative phase-sequence magnetic potential, this moment will act on rotor shaft and the out frame simultaneously, thereby makes rotor produce torsional oscillation.
Existing excitation method is at first thrown off unit and electrical network, then with the phase direct short-circuit ground connection in the step-up transformer high-pressure side.Again the field power supply of normal exciter is disconnected, connect the excitation system of test usefulness.During test, making excitation earlier is zero, one phase current of short circuit this moment is less, and then progressively increase excitation, so that reach needed negative-sequence current in generator, thereby the out-of-balance current that produces therefrom will cause that the alternate torque that doubles rotating speed affacts rotor coral fried twisted dough sticks and makes rotor produce torsional oscillation.In order to ensure unit safety, short-circuit current value should be lower than the specified negative-sequence current value of generator amature.But the torsional oscillation waveform in order to guarantee to obtain recording out should have enough big short-circuit current again.But the method for this exciting has a lot of weak points, at first is that negative-sequence current is bigger than normal.Well-known negative-sequence current produces the rotating magnetic field that reverses in air gap, it has brought extra loss to rotor.These losses are included in two times of caused losses of rotating speed extra current responding in the field winding, and in the additional surface loss that eddy current produced of rotor surface owing to induction, all these losses all belong to I
2The character of R causes the temperature rise of rotor.When local contact resistance rises, (as retaining ring contact inhomogeneous etc.), local temperature has bigger rising, and secondly a mutually directly grounded way is dangerous behind step-up transformer, and also inserted test circuit with the irrelevant main-transformer of rotor torsional oscillation, increased unsafe factor.The 3rd, because the restriction of the rotary speed property of exciter generating is unfit to do the low frequency test.
For present pick-up method, in order to measure torsional oscillation, developed a kind of relatively sensitiveer comparatively speaking torsiograph, the signal that it need be imported is a tacho-pulse, and this is to utilize a magnetic sensor and a gear that is contained on the alternator shaft to produce needed pulse signal.Can certainly cooperate having or not of luminous flux to reach same purpose with photoelectric sensor.The tooth of gear just induces pulse in coil by magnetic sensor the time.When rotating speed was constant, pulsed frequency was also constant, if this moment, torsional oscillation took place axle, sensor output will be the superposed signal of rotating speed and torsional oscillation so.This moment, torsional vibration signals was modulated tach signal, thereby had obtained a pulse, and its frequency is near the frequency modulation on pulse that changes average frequency.With this FM signal accent that is situated between, produce a vibration signal that is directly proportional with torsional angle by torsiograph behind integration, Here it is needed torsional vibration signals just can be observed, analyzes and write down after mixing other corresponding instrument again.
But this pick-up method, problem is can produce the frequency modulation on pulse except the torsional oscillation of axle, because the flexural vibrations that the remaining imbalance of rotor causes also can produce frequency modulation on pulse, because flexural vibrations can be carried out frequency modulation to tach signal equally, torsiograph output will be that " curved one turns round composite signal " will influence the precision of test greatly so.
The objective of the invention is to seek a kind of new excitation method, thereby the negative-sequence current when reducing test reduces extra loss that it brings to rotor and the temperature rise that reduces rotor.That will avoid also that a mutually directly grounded way is brought behind the main step-up transformer is dangerous, moreover also can carry out the low frequency test.To avoid of the restriction of main generator excitation machine to rotary speed property.Seek a kind of new pick-up method simultaneously, it can reach the composition of elimination flexural vibrations in torsional test, makes the signal of input torsiograph, obtains pure torsional vibration signals after transferring through being situated between.
It is achieved in that we think that the alternation moment that evokes torsional oscillation in theory is a kind of mechanical force moment, and its size should be relevant with electric power, rather than only depend on current value.Thereby think: in order to ensure unit safety, can use external load fully, cause terminal voltage to raise, make the means that electric power is constant or increase, reach the purpose that reduces negative-sequence current.
Our imagination can be at any two alternate loading R of generator output end.If the alternate loading R of AC:
Its imbalance power is so:
W＝I×Z
＝I
2[（Xa+Xc）
2+（ra+rc+R）
2]
1/2
The negative-sequence current of this moment is:
In the formula: the impedance of Z-load circuit.
The I-load current.
The coil inductance of Xa-A phase.
The coil inductance of Xc-C phase.
The coil internal resistance of ra-A phase.
The coil internal resistance of rc-C phase.
R-load internal resistance.
Our imagination also can be after any phase loading ground connection.If A phase loading R:
Its imbalance power is so:
W＝I
2×Z＝I
2[X
2a+（ra+R）
2]
1/2
The negative-sequence current of this moment is:
I＝1/3I
R is a pure resistance in above-mentioned two kinds of methods, also can be the induction reactance load.
All done the torsional test (comprising R=O) of 7 kinds of different loads values with each of above-mentioned two kinds of schemes.Each test all is to make the experiment table rotor be in single order torsional resonance (16.0HZ), and maximum torsional angle is to measure required exciting electric parameter (out-of-balance current, voltage and electric power) under 1.6 ° the operating mode.All data are listed table (1) in.
(seeing Table 1)
By these data as can be known:
(1) under various loads, although load current I alters a great deal, negative-sequence current I
2Change also big, but make rotor produce the electronic rate constant substantially (single-phase loading is all the more so) of identical torsional angle.Therefore think: the uneven torque value that makes rotor produce torsional oscillation depends on uneven electric power value, rather than only depends on the out-of-balance current value.Therefore confirmed to adopt the way of applied load, can make negative-sequence current I
2Reduce, and don't reduce, even can increase the alternate torque that excites the rotor torsional oscillation.
(2) electric power of indication is I herein
2Z and be not only active power I
2R, therefore think applied load can be pure resistance also can have inductive nature.
According to above-mentioned conclusion, we adopt the method for single-phase loading in 7 of green hill cogeneration plant
#Done the test of torsional oscillation example on the machine 50,000 KW turbodynamos, and achieved success.The actual negative-sequence current that produces is less, has improved the security of test unit greatly.
Actual use value when negative-sequence current value allowable that this machine is calculated by each class standard and test is listed in table (2)
7＜`; +; `〉machine rated current I＜`; ; H` 〉=3440A, I
2=＜`-; 1; 3`〉I＜`; ; H` 〉
(seeing Table 2)
Numerical value and form to load R should take in from following points:
(1) allows by producing 4%I
HThe load current of negative-sequence current.
(2) for for the purpose of the safety of test operation, the Control of Voltage of load two ends is about 1000 volts, and the heat that the load wasted work is converted to can distribute well.
(3) this device needs and can adjust load current and terminal voltage according to different subjects.
(4) this device should be in light weight, cost is low, can flow in each power plant to use.
For present pick-up method, owing to be to utilize a sensor and one to be contained in alternator shaft to cog and produce needed pulse signal, import torsiograph again, thereby torsiograph output will be " bend-turning round composite signal ", greatly the precision tested of influence; It can be estimated with mathematical formulae:
Signal S(hypothesis tach signal, torsional vibration signals, the flexural vibrations signal picked up for the sensor that is contained in horizontal level all are to be Sine distribution)
S＝asin（w
1t）+ja
2sin（w
2t）+ja
fsin（w
3t）
In the formula: a
1Sin(w
1T) be the tach signal of axle,
a
2Sin(w
2T) be the torsion vibration signal of axle,
a
fSin(w
3T) be the flexural vibrations signal of a f-f direction,
J represents this half-twist, so w
2And w
3Answering could the arithmetic addition behind the half-twist.
For tach signal a
1Sin(w
1T) transfer the back to remove by torsiograph Jie, but to ja
2Sin(w
2T)+ja
fSin(w
3T) then can not remove w voluntarily
3This can only export composite signal, must influence measuring accuracy.
Our idea and studied a kind of " interlock circuit " for this reason, it can reach the purpose of eliminating the flexural vibrations composition.This is a kind of new pick-up method: at a gear side that is contained on the alternator shaft two vibro-pickups that are fixed on the test stand are housed exactly, these two vibro-pickups all insert " correlator ", after " correlator " is synthetic, become a signal input torsiograph, can obtain pure torsional vibration signals after transferring through being situated between.
The signal of picking up for first vibro-pickup:
S＝a
1sin（w
1t）+ja
2sin（w
2t）+ja
fsin（w
3t）
Because flexural vibrations w
3Direction determine and rotating speed w
1With torsional oscillation w
2Direction be clockwise or counterclockwise, so if first vibro-pickup is decided to be w
1, w
2, w
3The three is addition, and w just becomes negative value (in the other direction) for second vibro-pickup so, so the signal that second vibro-pickup picked up is:
h＝a
1sin（w
1t）+ja
2sin（w
2t）-j[a
fcos（180-α）+a·sin（180-α）]sin（w
3t）
A. is the flexural vibrations of 0-0 axis of orientation in the formula, and when first vibro-pickup was horizontal, a. was the horizontal curvature amplitude of axle,
H=a ' then when the phase angle α of the first and second two vibro-pickups=180 °
1Sin(w
1T)+ja '
1Sin(W
2T)-ja
fSin(w
3T)
The effect of " correlator " is:
(1) output signal i=s+h.
(2) make two vibro-pickup signal sensitivities on amplitude, equate homophase on phase place.
(3) signal is carried out shaping, amplitude limit.
Because correlator makes a '
1=a, a '
2=a
2And signal does not have relevant.
So i=S+h=2[a
1Sin(W
1T)+ja
2Sin(w
2T)] just reached the purpose of in torsional vibration measurement, eliminating the flexural vibrations influence like this.Because " correlator " has the effect of shaping and amplitude limit for signal, so the amplitude part 2a among the output signal i
1And 2a
2In fact be a certain steady state value, in addition torsiograph is only responsive to the frequency modulation part, to the not reflection of variation of input signal amplitude, so after torsiograph is situated between accent, W
1Disappear W
3Behind correlator, just do not existed, reached output torsional vibration signals W
2Purpose.
If because structural reason makes two angle α between the vibro-pickup can not keep 180 °, so along with the minimizing of α, the effect of offsetting flexural vibrations will progressively reduce, and when two vibro-pickups overlap (α=0), its function of offsetting flexural vibrations has also disappeared.
In addition, in the time of can not making 0-0 on level owing to structural reason equally, the function of this correlator remains unchanged, only this moment, a. no longer was a horizontal vibration, but the vibration of 0-0 direction, vertical af no longer is vertical vibration too for a. direction, but with the perpendicular f-f direction of 0-0.So this method allows 0-0 to become any angle with horizontal line.
If the phase place of two vibro-pickups has small difference, be to adjust the identical of phase place by the mechanical established angle of vibro-pickup.That is to say the relative position of the tooth of two sensors and gear, answer strictness to be consistent, promptly before test when static, vibro-pickup be facing to tooth top (or end) then another vibro-pickup also should face toward tooth top (or end).
The sensing head of vibro-pickup can be electromagnetic type also can be photo-electric.
In new pick-up method in order to make the signal plus of two vibro-pickups, make two vibro-pickup signal Min Lingdu equate on the amplitude, on phase place homophase, and signal carried out shaping and amplitude limit.To reach the purpose of in torsional vibration measurement, eliminating the flexural vibrations influence, need the specialized equipment-correlator of pick-up.
It is such that correlator constitutes: vibro-pickup 1,2 two paths of signals are passed to two sockets of correlator respectively, wherein in No. 2 sockets a heart yearn ground connection, thereby make 2
#The road phase place is fixed, as benchmark to 1
#The phase place on road compares, and two signal core lines that enter No. 1 socket can be realized any ground connection in two heart yearns by phase reversal switch, thereby can be according to 2
#The situation of road phase correlation has been done paraphase whether selection.Obtaining 1
#, 2
#Behind the signal homophase, signal arrives measuring point through the decay of two potentiometers respectively, can make 1 by regulating two potentiometers
#, 2
#The two paths of signals constant amplitude.That has realized two paths of signals homophase and constant amplitude so requires 1
#The road is divided into two lines behind potentiometer, wherein single line is by ground connection behind the resistance, and another root also connects a resistance, and same 2
#The road also is divided into two lines behind potentiometer, wherein single line is by ground connection behind the resistance, and another root also connects a resistance, for 1
#With 2
#Wherein the single line connecting resistance is unearthed on the road then be connected to each other after again by ground connection behind the resistance, like this, 1
#With 2
#What obtain on the tie point of Lu Ergen line is respectively 1
#With 2
#Signal after the dividing potential drop of road, so and because it is the addition of two paths of signals that two road signals come together in what obtain on the same tie point, these several resistance have been formed totalizer since totalizer be with resistance form therefore linear good.Above-mentioned like this circuit just can make the signal of two vibro-pickups obtain pure torsional vibration signals through handling, and has just realized the result that mathematical formulae is represented in the new pick-up method.
When vibro-pickup adopts the electromagnetic sensing head; because the actual scope that tests the speed is very wide; forward several thousand commentaries on classics to from per minute tens; the voltage that it is exported when high speed can nearly hundreds of volts; this semiconductor circuit to the back is disadvantageous, so insert the holding circuit of being made up of resistance and bilateral diode again after two road signal tie point additions.Make signal the most very much not can surpass their limit value, more greatly then from the bilateral diode conducting.Import smit circuit then, carry out shaping and signal is become the square wave of rule for the torsiograph processing.Also be connected to corrector in the correlator, it can produce the tach signal and the torsional vibration signals of simulation, for checking whether correlator and torsiograph work is just commonly used.The alternating current that stabilized voltage supply makes 220 volts also is housed converts 12 volts direct supply to, to supply with the working power of smit circuit and corrector.
Advantage of the present invention is to have adopted that can to reduce that negative-sequence current, load can be connected on behind the main-transformer also after single-phase loading of generator output end or the alternate loaded exciting new technology can be 15H without main-transformer, the low-limit frequency that can survey
zAbout, the loss of motor is reduced, the frequency range of the reliable test of experimental safe is also more extensive, in the pick-up method, adopted interlock circuit, can reach the purpose of eliminating the flexural vibrations composition, obtain pure torsional vibration signals behind the accent that is situated between, correlator is the specialized equipment of new pick-up method, and side easy to use leans on.
Pick-up method of the present invention, promptly use the pick-up method of vibro-pickup of the present invention and correlator, except to the torsional oscillation of test plant generator unit effectively, to measuring any other mechanical torsional oscillation, for example the torsional oscillation of motor, internal combustion engine etc. also be same effectively, this point is the conspicuous explanation in a step when not needing to do.
The drawing explanation
Accompanying drawing one, be alternate loading excitation method electrical schematic diagram of the present invention
Accompanying drawing two, be single-phase loading excitation method electrical schematic diagram of the present invention
Accompanying drawing three, be pick-up technical schematic diagram of the present invention
Accompanying drawing four, be the pulse signal synoptic diagram that vibro-pickup produces
Accompanying drawing five, be correlator electrical schematic diagram of the present invention.
Embodiment one, alternate loading excitation method.
Shown in figure one, present embodiment comprises generator (2), the field coil (3) of itself in the generator (2), and external test excitation system of field coil (3) (8) and measuring current table, test excitation system (8) is then by exciter (4), the field coil of exciter (5), adjustable transformer (6) and isolating transformer (7) are formed, generator neutral grounded, and arbitrarily between two-phase as A, B is alternate to add load (1), can excite in the high-revolving process by low speed at generator like this and cause torsional oscillation and negative-sequence current is remained in the scope of permissible value, and it is quite safe, as a kind of conversion, load can not be connected on the generator, and receive on the transformer, this moment, generator still joined with the primary coil of transformer, and the secondary coil of transformer is neutral grounded, and arbitrarily between two-phase as A, add load (1) between the B phase.(this connection is not shown).
Embodiment two: single-phase loading excitation method.
Shown in figure two, present embodiment is basic identical with embodiment one, does not just adopt two alternate loadings, the load (1) but single-phase for example B joins, and then ground connection, and the method is similar to the effect of embodiment one, and just negative-sequence current can be more littler.Can not be connected in the generator as a kind of transformation load and receive and go in the transformer, but with one of the transformer secondary output ground connection (this kind connection, not shown) again of joining after the load
Example example three: the pick-up method that adopts interlock circuit.
Shown in figure three, present embodiment comprises the tested gear (9) that is contained in generator (also can be contained in other machinery certainly) rotating shaft, with gear (9) very little gap is arranged and be fixed on vibro-pickup (10) and (11) on the test stand, two vibro-pickups fold the angle into α, the pulse signal that experience vibro-pickup (10) and (11) all inserts correlator (12), again by correlator (12) with two signal plus, reconcile back input torsiograph (13), and the needed shaft torsional signal of torsiograph (13) output, Fig. 4 is that vibro-pickup (10) and (11) are arranged on a diameter, and face mutually, the signal input correlator addition of picking up is reconciled back input torsiograph (13) and the torsional oscillation waveform occurred.Can eliminate the composition of flexural vibrations with the method, obtain pure torsional vibration signals, improve measuring accuracy.
Embodiment four: the specialized equipment correlator
Shown in figure five: two socket CK that import present embodiments by vibro-pickup (10) and two next signals of (11)
1And CK
2, CK wherein
2In a heart yearn ground connection, thereby make CK
2After phase place fix and socket CK
1After circuit on be connected to phase reversal switch K
2, can realize entering socket CK
1Two heart yearns in any ground connection, thereby can according to CK
2The situation of phase correlation is made paraphase whether selection.At phase reversal switch K
2After circuit on be connected to potentiometer W
1, resistance R
2And R
1, monitoring socket CZ
2, socket CK
2After circuit on be connected to potentiometer W
1, resistance R
3, R
4, R
6, monitoring socket CZ
2The two-lines road is at R then
1And R
3After be connected.By regulating two potentiometer W
1And W
2, can make the two paths of signals constant amplitude, resistance R
1, R
3And R
6Form totalizer: 1 road signal is through R
1And R
6Dividing potential drop is at R
1And R
6Tie point on obtain signal after 1 tunnel dividing potential drop.2 road signals are through R
3And R
6Dividing potential drop is at R
3And R
6Tie point on obtain signal after 2 tunnel dividing potential drops because the signal after two tunnel dividing potential drops is in same tie point, thus realized the addition of two paths of signals since totalizer be with resistance form therefore linear good.Link tester after the addition is crossed resistance R
5, bilateral diode D
1.2, capacitor C
1, resistance R
7Input smit circuit (17), and be connected to resistance R
3, capacitor C
2, C
3Monitoring socket CZ
2, R wherein
5And D
1.2Formed holding circuit, signal is through R
5Step-down arrives D
1.2Make signal the most very much not can surpass its limit value.Common four groups of identical like this electrical equipments and circuit, can test simultaneously for 4, also has a corrector (16) in the correlator, can produce the tach signal and the torsional vibration signals of simulation, for checking whether correlator and torsiograph work is just commonly used, stabilized voltage supply (15) also is housed, makes 220 volts alternating current convert 12 volts direct supply to, to supply with the working power of smit circuit and corrector.
Claims (15)
1, a kind of plant generator unit determining testing vibration method that relates to the machine rotors vibration test, comprise the plant generator unit is carried out artificial exciting, by the vibro-pickup pick-up, measure by torsiograph again and the demonstration torsion frequency, it is characterized in that described artificial exciting is the unbalanced load of output terminal adjunction (1) at the plant generator unit, and the people is the exciting that causes.
2, plant generator unit determining testing vibration method as claimed in claim 1 is characterized in that described output terminal is that the three-phase of power station generator is directly exported.
3, plant generator unit determining testing vibration method as claimed in claim 1 is characterized in that described output terminal is meant the unbalanced load of adjunction (1) behind generator step-up transformer.
4, plant generator unit determining testing vibration method as claimed in claim 2, it is characterized in that external load (1) can be added in generator and bring out the ground connection mutually and simultaneously of any one in A, B, the C three-phase, or be added between any two-phase in generator output end A, B, the C three-phase.
5, plant generator unit determining testing vibration method as claimed in claim 3, it is characterized in that external load (1) can be added in the ground connection mutually and simultaneously of any one in generator step-up transformer output terminals A, B, the C three-phase, or be added between any two-phase in generator step-up transformer output terminals A, B, the C three-phase.
6,, it is characterized in that external load (1) can be that the impedance part also can be the induction reactance part as claim 1 or 2 or 3 or 4 or 5 described plant generator unit determining testing vibration methods.
7, as claim 1 or 2 or 3 or 4 or 5 described plant generator unit determining testing vibration methods, the method that it is characterized in that pick-up is that the side at tested gear (9) has two vibro-pickup (10) and (11) that are fixed on the test stand.
8, plant generator unit determining testing vibration method as claimed in claim 7 is characterized in that the optimum angle α between vibro-pickup (10) and (11) is 180 °.
9, plant generator unit determining testing vibration method as claimed in claim 7 is characterized in that vibro-pickup (10) and (11) can be that the magnetic-electric sensing head also can be a photohead.
10, plant generator unit determining testing vibration method as claimed in claim 7, the method that it is characterized in that pick-up is that correlator (12) is all inserted in vibro-pickup (10) and (11), outlet line by correlator (12) is connected with torsiograph (13), and torsiograph (13) will be exported needed shaft torsional signal.
11, the pick-up specialized equipment correlator during a kind of plant generator unit torsional oscillation that relates to the machine rotors vibration test is tested, it comprises stabilized voltage supply (15), smit circuit (17) and is attached thereto the electric elements that connect, after it is characterized in that correlator is inserted in vibro-pickup (10) and (11), two road electric wirings are connected on the node forms adder circuit.
12, pick-up specialized equipment as claimed in claim 11 is characterized in that the signal of vibro-pickup (10) and (11) is to be input to CK
1And CK
2Two sockets, CK
2In a heart yearn ground connection, socket CK
1After circuit on be connected to phase reversal switch K
2, potentiometer W
1, resistance R
2And R
1, socket CK
2After circuit on potentiometer W is arranged
2, resistance R
3, R
4, R
5, the two-lines road is at R then
1And R
3After be connected and insert resistance R again
5, and the electric wiring that is connected with each components and parts.
13, pick-up specialized equipment as claimed in claim 12 is characterized in that monitoring in addition socket CZ
1And CZ
2
14,, it is characterized in that it also can be other many groups that adder circuit can be four groups as claim 12 or 13 or 14 described pick-up specialized equipments.
15, pick-up specialized equipment as claimed in claim 15 is characterized in that corrector (16) in addition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85109518.6A CN1004941B (en) | 1985-12-30 | 1985-12-30 | Determining testing vibration method and apparatus for the generating set in a power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85109518.6A CN1004941B (en) | 1985-12-30 | 1985-12-30 | Determining testing vibration method and apparatus for the generating set in a power station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85109518A CN85109518A (en) | 1986-09-03 |
| CN1004941B true CN1004941B (en) | 1989-08-02 |
Family
ID=4796373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85109518.6A Expired CN1004941B (en) | 1985-12-30 | 1985-12-30 | Determining testing vibration method and apparatus for the generating set in a power station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1004941B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101169352B (en) * | 2007-11-29 | 2010-08-11 | 北京四方继保自动化股份有限公司 | Scanning frequency method for testing large turbine generator set torsional vibration mode |
| CN100593724C (en) * | 2008-07-04 | 2010-03-10 | 四方电气(集团)有限公司 | Synchronous torsional vibration excitation method simultaneously excitating multi-turbine generator set torsional vibration |
| CN102147285B (en) * | 2010-02-05 | 2012-09-05 | 财团法人工业技术研究院 | Device for measuring torsional resonance frequency and method therefor |
| CN106197918A (en) * | 2016-07-01 | 2016-12-07 | 广东电网有限责任公司电力科学研究院 | A kind of torsional oscillation test error bearing calibration |
| CN106908137A (en) * | 2017-03-06 | 2017-06-30 | 华南理工大学 | It is a kind of for bearing calibration of the reflective code with torsional vibration measurement error |
-
1985
- 1985-12-30 CN CN85109518.6A patent/CN1004941B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85109518A (en) | 1986-09-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Brown et al. | A general method of analysis of three-phase induction motors with asymmetrical primary connections | |
| Brown et al. | The starting of a 3-phase induction motor connected to a single-phase supply system | |
| CN1004941B (en) | Determining testing vibration method and apparatus for the generating set in a power station | |
| Smith et al. | Transients in induction machines with terminal capacitors | |
| US6208061B1 (en) | No-load generator | |
| CN202854310U (en) | Magnetic flux sensor of generator shaft | |
| Smith | Harmonic field analysis for slip-ring motors including general rotor asymmetry | |
| CN112505543A (en) | Large-scale generator iron loss detection system and method | |
| Chalmers et al. | Importance of direct-and quadrature-axis damper impedances in starting performance of salient-pole motors | |
| Zheng et al. | Frequency response curves of windings with bulge deformation in power transformers | |
| Johnson | Selsyn design and application | |
| Andresen et al. | A shearing-wave generator for operation in deep bore holes | |
| Ueda et al. | Measurement and analysis of 70 MW superconducting generator constants | |
| SU1500866A1 (en) | Device for measuring the temperature of windings of electric machines | |
| Pillay et al. | A comparison between star and delta connected induction motors when supplied by current source inverters | |
| CN214150965U (en) | Direct current motor excitation winding interturn fault detection circuit | |
| Williamson et al. | The effect of interbar currents in a permanent split capacitor motor | |
| CN2155575Y (en) | Compensated manual neutral-point measuring device | |
| Morita | Air gap flux analysis for cage rotor diagnosis | |
| US1648693A (en) | Gas-density meter | |
| Drabek et al. | Operation of the induction motor supplied with a distorted voltage | |
| Shepherd et al. | The quadrature synchronous reactance of salient-pole synchronous machines | |
| SU1384972A1 (en) | Magnetoelastic torque generator | |
| Idziak et al. | Spectral analysis of phase currents of LSPMSM at asymmetric voltage supply | |
| SU1539697A1 (en) | Method of indirect determination of mechanical characteristic of induction motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |