CN103267587A - Calculation method of temperature of rotor winding of large-size water-turbine generator set - Google Patents
Calculation method of temperature of rotor winding of large-size water-turbine generator set Download PDFInfo
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- CN103267587A CN103267587A CN2013100870359A CN201310087035A CN103267587A CN 103267587 A CN103267587 A CN 103267587A CN 2013100870359 A CN2013100870359 A CN 2013100870359A CN 201310087035 A CN201310087035 A CN 201310087035A CN 103267587 A CN103267587 A CN 103267587A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/04—Thermometers specially adapted for specific purposes for measuring temperature of moving solid bodies
- G01K13/08—Thermometers specially adapted for specific purposes for measuring temperature of moving solid bodies in rotary movement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K2217/00—Temperature measurement using electric or magnetic components already present in the system to be measured
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- General Physics & Mathematics (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a calculation method of a temperature of a rotor winding of a large-size water-turbine generator set. The calculation method comprises the following steps: (1) respectively measuring temperatures of a halting state and a no-load state of the rotor winding of a generator and the rotor winding; and calculating to obtain the temperature of the rotor winding and the linear coefficient of a resistor; (2) sampling to obtain real-time sampling values of exciting voltage and exciting current to obtain a resistance value of the rotor winding; and (3) multiplying a real-time resistance value of the rotor winding by the temperatures of the rotor winding and the linear coefficient of the resistor, and subtracting a zero resistance temperature to obtain the temperature of the rotor winding. According to the calculation method disclosed by the invention, the measurement of rotor voltage and rotor current has a filtering function and a fault-tolerant mechanism; and a linear coefficient calculation method of a rotor resistance and a rotor temperature is optimized and the calculation of the resistance value of the rotor winding is closer to an actual value; meanwhile, influence of the slip ring pressure drop and the bus pressure drop on calculation of rotor temperature are considered to enable the calculation of the resistance value of the rotor winding closer to an actual temperature, so that the accuracy of measuring the temperature of a rotor is improved.
Description
Technical field
The invention provides a kind of method that improves rotor winding resistance value accuracy in computation, the method is by optimizing the linear coefficient of rotor winding resistance value and temperature, rationally choose the measuring and calculating point, consider the influence factor of external loop, and the sampling of rotor voltage and rotor current carried out filtering is fault-tolerant to be realized, belong to electrical technology field.
Background technology
The temperature of large-scale generator rotor is the important monitored parameter of generator safe operation, measuring method comprises the direct method of measurement and the indirect method of measurement, direct method of measurement measured result is reliable, but realizes that difficulty is bigger, and has increased new difficulty to equipment safety operation and repair and maintenance.Indirect method of measurement ultimate principle is the resistance-temperature characteristic according to copper conductor, owing to need the real-time monitor value of field voltage and exciting current, therefore the method for utilizing excitation software to calculate the rotor winding temperature has obtained using the most widely, and its realization is easier, does not also need special maintenance.
The realization of the method needs the linear coefficient of resistance and temperature, and the real-time sampling value of field voltage and exciting current, wherein calculates the linear coefficient majority and be by absolute zero and winding maximum temperature or the resistance at full capacity the time realizes.The error of wherein sampling, algorithm, output element etc. all can cause the inaccurate of temperature computation, and the accuracy that therefore improves sampling, calculating, output element concerns the accurate measurement of rotor winding temperature.
Summary of the invention
Technical matters to be solved by this invention is to improve the accuracy that the rotor winding temperature is measured from sampling, algorithm and output element simultaneously.
In order to address the above problem, the technical solution used in the present invention is:
A kind of measuring method of Large Hydroelectric Set rotor winding temperature is characterized in that: may further comprise the steps:
(1), measuring the generator amature winding respectively shuts down temperature under attitude and the unloaded attitude and rotor winding, calculates the linear coefficient of rotor winding temperature and resistance by the method for 2 definite straight line slopes then;
(2), obtain the real-time sampling value of field voltage and exciting current by sampling, the field voltage place obtains the rotor winding resistance value divided by exciting current;
(3), the real-time resistance of the rotor winding linear coefficient that multiply by rotor winding temperature and resistance deducts zero-resistance temperature again and draws the rotor winding temperature.
The measuring method of aforesaid a kind of Large Hydroelectric Set rotor winding temperature is characterized in that: in the described step (1): measure the generator amature winding in advance and shut down the attitude temperature T
1With unloaded attitude temperature T
2And corresponding rotor resistance R
1And R
2, use measured value according to formula
Calculate the linear coefficient K of winding temperature and resistance
1, in order to make K
1The calculating of coefficient is not subjected to the influence of external circuit, and calculating required rotor resistance all needs to record from slip ring and rotor winding junction.
The measuring method of aforesaid a kind of Large Hydroelectric Set rotor winding temperature is characterized in that: in the described step (2): rotor resistance R
fBe to calculate gained by field voltage and exciting current that sampling obtains, calculating R
fThe time need deduct this outside loop resistance value.
The measuring method of aforesaid a kind of Large Hydroelectric Set rotor winding temperature, it is characterized in that: the sampling element of rotor-exciting voltage and rotor excitation current carries out fault-tolerant, rotor-exciting voltage calculates by trigger angle and anode voltage, can carry out the tertiary voltage sampling a sampling period program, and officiate's function for the third time, to for the first time and secondary sampling carry out fault-tolerantly, select and the value that approaches for the third time; And the sampling of rotor-exciting voltage need be passed through the filtering link, and the interference shake of the shake of the moment of rotor voltage or measurement links brings error for the measurement of rotor resistance when avoiding moving; Whether current sample is fault-tolerant to be that passage is measured in two of comparisons similar, if just dissimilar and theoretical value relatively, is selected near theoretical value, theoretical value then is by meritorious idle and set end voltage calculating.
The measuring method of aforesaid a kind of Large Hydroelectric Set rotor winding temperature is characterized in that: when measuring generator amature winding shutdown attitude rotor resistance, record generator amature winding resistance value R at slip ring and rotor winding junction
1, record the generator amature winding resistance value (R of band external circuit in generator D.C. magnetic field isolating switch outlet side
1+ R
l), R wherein
lBe the external circuit resistance, sample then gained field voltage and exciting current actual value are respectively U
fAnd I
f, then can get the rotor resistance
The measuring method of aforesaid a kind of Large Hydroelectric Set rotor winding temperature, it is characterized in that: in the described step (3): the copper critical temperature that enters superconducting state is near absolute zero-273 ℃ in theory, but the resistance of copper conductor is minimum when in fact arriving-234.5 ℃, be the zero-resistance temperature of copper conductor so get-234.5 ℃ during industry is calculated, be the intersection point of Fig. 1 cathetus extended line and horizontal ordinate, the zero-resistance temperature K that is determined by rotor winding material copper
2Get 234.5, but consider that the existence of slip ring contact resistance makes the temperature of rotor T that calculates
fSlightly higher than actual value, therefore get K
2=-235.1 offset this error.
The measuring method of aforesaid a kind of Large Hydroelectric Set rotor winding temperature is characterized in that: in the described step (3): according to the linear relationship of rotor winding temperature and resistance, can get
T
f＝K
1R
f-K
2 (1)
T wherein
f---the rotor winding temperature
K
1---the linear coefficient of winding temperature and resistance
R
f---the rotor winding resistance value
K
2---the zero-resistance temperature that is determined by rotor winding material.
The invention has the beneficial effects as follows:
1, the sampled point in the loop according to field voltage and exciting current, the influence of external circuit has been considered in the calculating of rotor winding resistance value, it is more accurate to calculate.
2, normal temperature attitude survey rotor winding resistance value records from the rotor ring junction, and it is more accurate that the linear coefficient of rotor winding temperature and resistance calculates, and choosing and shutting down attitude is to calculate this coefficient with unloaded attitude lower rotor part temperature under the environment temperature.
3, consider the influence of slip ring pressure drop, bus pressure drop during the rotor winding temperature calculates.
4, the measurement of the field voltage of rotor and exciting current has filtering and fault tolerance, exporting the result simultaneously need carry out fault-tolerant to it equally, to not meeting linear scaling, when the temperature that dispersed parameters sets and the oblique line of electric current are too many, again to the electric current and voltage calculating of sampling, perhaps cast out this point.
In sum, the present invention is fault-tolerant by the sampling of calculating the temperature of rotor correlation parameter is carried out, computing method are revised, and makes the rotor winding temperature that draws more near actual value, the actual heating situation of reflection rotor winding.
Description of drawings
Fig. 1 is the graph of a relation of copper conductor resistance among the present invention and temperature.
Fig. 2 is rotor circuit theory figure of the present invention.
Fig. 3 is the fault-tolerant and filtering logical diagram of rotor voltage sampling.
Embodiment
With reference to the accompanying drawings and in conjunction with example the present invention is described in further detail.But the invention is not restricted to given embodiment.
Fig. 1 is resistance and its variation of temperature graph of a relation of copper conductor, under ordinary temp (except high temperature and extremely low temperature) as can be seen, the resistance of copper conductor and its temperature are the good linear relation, and near linear, its slope depend on size and the structure of copper conductor.The characteristic of copper product has determined the resistance-temperature characteristic line of any copper conductor all to pass through (234.5,0) this point among Fig. 1.According to the graph of a relation of Fig. 1 as can be known, as long as draw the slope of rotor winding resistance temperature characterisitic line, calculate the resistance value of rotor under certain temperature again, can correspondence calculate corresponding temperature of rotor value.
Measure the temperature T of rotor under normal temperature state and running status
1And T
2And corresponding resistance value R
1And R
2, i.e. known two point (T
1, R
1) and (T
2, R
2), can determine the slope of the temperature characterisitic line among Fig. 1.Equate other point (T on the characteristic line according to slope
f, R
f) all satisfy:
Can draw
According to noted earlier, K
1Calculating can realize R to rotor winding temperature and resistance measurement by the normal temperature attitude
fThe calculating influence that need remove loop resistance.
Fig. 2 shows the rotor loop schematic diagram:
Wherein, 1-rotor winding; The 2-slip ring; The 3-carbon brush; The 4-de-excitation resistance; The 5-de-excitation resistance is thrown and is backed out the pass; 6-D.C. magnetic field isolating switch; The 7-shunt; 8-divides pressing plate; 9-rotor current transmitter; 10-rotor voltage transmitter; The 11-rectifier cabinet.
Need to measure the temperature T of normal temperature attitude
1And normal temperature attitude rotor resistance, comprise the resistance R that records from the slip ring junction
1Resistance (R with the band external circuit
1+ R
l), because the rotor resistance is less, so higher to the degree of accuracy of measuring required instrument.
Before the measurement, give the field regulator plus signal with the millivolt signal generator, calibrate field voltage and exciting current respectively; Disconnect generator D.C. magnetic field isolating switch under the stopped status, A point place cable is untied to disconnect de-excitation resistance.Two WHM-5 type digital display psychrometers are positioned on the generator on the wind-tunnel rotor magnetic pole, get the temperature-averaging value as generator amature winding environment temperature T
1Use JYR-10 type DC Resistance of Transformer high speed tester to record generator amature winding resistance value R at slip ring and rotor winding junction (being B among Fig. 2, C point place)
1, record the generator amature winding resistance value (R of band external circuit in generator D.C. magnetic field isolating switch outlet side (being D among Fig. 2, E point place)
1+ R
l).Become the separate excitation mode by excitation rotor is carried out through-flow intensification, measure the rotor tip temperature with the infrared point temperature rifle downwards from the generator amature top, when temperature reaches T
2Remove exciting current when (between the 50-70 degree), measure the rotor loop resistance R from the power cabinet outlet immediately
2In like manner, can use the same method another temperature point of measurement as redundancy fault-tolerant.The linear coefficient K of temperature and resistance
1Be by under the no-load condition with shut down two points of loop resistance under the attitude normal temperature as reference point, 2 fixed lines determine, the slip ring contact resistance to the influence of temperature of rotor then at K
2Middle consideration.WHM-5 type digital display psychrometer, temperature measurement range-20 ℃～100 ℃, 1 ℃ of minimum lattice.JYR-10 type DC Resistance of Transformer high speed tester resolution 0.1 μ Ω, measurement range 1 μ Ω～2 Ω, accuracy of measurement ± 0.2%, measuring current 10A.
The copper critical temperature that enters superconducting state is near absolute zero-273 ℃ in theory, but the resistance of copper conductor is minimum when in fact arriving-234.5 ℃, be the zero-resistance temperature of copper conductor so get-234.5 ℃ during industry is calculated, be the intersection point of Fig. 1 cathetus extended line and horizontal ordinate, the zero-resistance temperature K that is determined by rotor winding material copper
2Get 234.5, but consider that the existence of slip ring contact resistance makes the temperature of rotor T that calculates
fSlightly higher than actual value, therefore get K
2=-235.1 offset this error.
As shown in Figure 3, rotor-exciting voltage obtains: U1, U2, U3 are respectively to adopt in the sampling period 20ms and get three rotor-exciting voltages.Preceding adopt for twice field voltage U1, U2 is no more than under the 5%U1 situation in difference, choose U1 then after the filtering link as rotor voltage.Preceding adopt for twice field voltage U1, U2 surpasses under the 5%U1 situation in difference, chooses U1, among the U2 voltage close with the U3 that samples for the third time then after the filtering link as rotor voltage.The rotor excitation current sampling is fault-tolerant and filtering is the same with rotor-exciting voltage.
Gained field voltage and exciting current actual value are respectively U as sampling this moment
fAnd I
f, with formula
With
Substitution (1) formula gets
T
f---the rotor winding temperature
R
l---the external circuit resistance.
More than show and described ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (7)
1. the measuring method of a Large Hydroelectric Set rotor winding temperature is characterized in that: may further comprise the steps:
(1), measuring the generator amature winding respectively shuts down temperature under attitude and the unloaded attitude and rotor winding, calculates the linear coefficient of rotor winding temperature and resistance by the method for 2 definite straight line slopes then;
(2), obtain the real-time sampling value of field voltage and exciting current by sampling, the field voltage place obtains the rotor winding resistance value divided by exciting current;
(3), the real-time resistance of the rotor winding linear coefficient that multiply by rotor winding temperature and resistance deducts zero-resistance temperature again and draws the rotor winding temperature.
2. the measuring method of a kind of Large Hydroelectric Set rotor winding temperature according to claim 1 is characterized in that: in the described step (1): measure the generator amature winding in advance and shut down the attitude temperature T
1With unloaded attitude temperature T
2And corresponding rotor resistance R
1And R
2, use measured value according to formula
Calculate the linear coefficient K of winding temperature and resistance
1, in order to make K
1The calculating of coefficient is not subjected to the influence of external circuit, and calculating required rotor resistance all needs to record from slip ring and rotor winding junction.
3. the measuring method of a kind of Large Hydroelectric Set rotor winding temperature according to claim 2 is characterized in that: in the described step (2): rotor resistance R
fBe to calculate gained by field voltage and exciting current that sampling obtains, calculating R
fThe time need deduct this outside loop resistance value.
4. the measuring method of a kind of Large Hydroelectric Set rotor winding temperature according to claim 3, it is characterized in that: the sampling element of rotor-exciting voltage and rotor excitation current carries out fault-tolerant, rotor-exciting voltage calculates by trigger angle and anode voltage, can carry out the tertiary voltage sampling a sampling period program, and officiate's function for the third time, to for the first time and secondary sampling carry out fault-tolerantly, select and the value that approaches for the third time; And the sampling of rotor-exciting voltage need be passed through the filtering link, and the interference shake of the shake of the moment of rotor voltage or measurement links brings error for the measurement of rotor resistance when avoiding moving; Whether current sample is fault-tolerant to be that passage is measured in two of comparisons similar, if just dissimilar and theoretical value relatively, is selected near theoretical value, theoretical value then is by meritorious idle and set end voltage calculating.
5. the measuring method of a kind of Large Hydroelectric Set rotor winding temperature according to claim 4 is characterized in that: when measuring generator amature winding shutdown attitude rotor resistance, record generator amature winding resistance value R at slip ring and rotor winding junction
1, generator D.C. magnetic field isolating switch outlet side record the band external circuit the generator amature winding resistance value (
R1+R
l), R wherein
lBe the external circuit resistance, sample then gained field voltage and exciting current actual value are respectively U
fAnd I
f, then can get the rotor resistance
6. the measuring method of a kind of Large Hydroelectric Set rotor winding temperature according to claim 5, it is characterized in that: in the described step (3): get-234.5 ℃ during industry is calculated and be the zero-resistance temperature of copper conductor, the zero-resistance temperature K that is determined by rotor winding material copper
2Get 234.5.
7. the measuring method of a kind of Large Hydroelectric Set rotor winding temperature according to claim 6 is characterized in that: in the described step (3): according to the linear relationship of rotor winding temperature and resistance, can get
T
f＝K
1R
f-K
2 (1)
T wherein
f---the rotor winding temperature
K
1---the linear coefficient of winding temperature and resistance
R
f---the rotor winding resistance value
K
2---the zero-resistance temperature that is determined by rotor winding material.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100870359A CN103267587A (en) | 2013-03-18 | 2013-03-18 | Calculation method of temperature of rotor winding of large-size water-turbine generator set |
| PCT/CN2013/084963 WO2014146422A1 (en) | 2013-03-18 | 2013-10-10 | Method for measuring and calculating temperature of rotor winding of large-sized water turbine generator set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100870359A CN103267587A (en) | 2013-03-18 | 2013-03-18 | Calculation method of temperature of rotor winding of large-size water-turbine generator set |
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|---|---|
| CN103267587A true CN103267587A (en) | 2013-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013100870359A Pending CN103267587A (en) | 2013-03-18 | 2013-03-18 | Calculation method of temperature of rotor winding of large-size water-turbine generator set |
Country Status (2)
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|---|---|
| CN (1) | CN103267587A (en) |
| WO (1) | WO2014146422A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014146422A1 (en) * | 2013-03-18 | 2014-09-25 | 国电南瑞科技股份有限公司 | Method for measuring and calculating temperature of rotor winding of large-sized water turbine generator set |
| CN104101442A (en) * | 2014-07-17 | 2014-10-15 | 贵阳新光电气有限公司 | Generator rotor winding temperature online monitoring method |
| CN105115620A (en) * | 2015-07-15 | 2015-12-02 | 广州日滨科技发展有限公司 | Winding temperature detection method and system and overheating protection method and system of three-phase synchronous door motor |
| CN108458812A (en) * | 2017-02-20 | 2018-08-28 | 南京天擎汽车电子有限公司 | The acquisition methods and acquisition device of motor winding temperature |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10914701B2 (en) * | 2016-06-21 | 2021-02-09 | General Electric Company | Systems and methods for determining rotor deterioration in a dynamoelectric machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103267587A (en) * | 2013-03-18 | 2013-08-28 | 国电南瑞科技股份有限公司 | Calculation method of temperature of rotor winding of large-size water-turbine generator set |
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2013
- 2013-03-18 CN CN2013100870359A patent/CN103267587A/en active Pending
- 2013-10-10 WO PCT/CN2013/084963 patent/WO2014146422A1/en active Application Filing
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| US4083001A (en) * | 1976-12-29 | 1978-04-04 | Westinghouse Electric Corporation | Measurement of motor winding temperature |
| EP2108930A1 (en) * | 2008-04-09 | 2009-10-14 | VARIAN S.p.A. | Contact-less device for measuring operating parameters of rotors of high-speed rotary machines |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014146422A1 (en) * | 2013-03-18 | 2014-09-25 | 国电南瑞科技股份有限公司 | Method for measuring and calculating temperature of rotor winding of large-sized water turbine generator set |
| CN104101442A (en) * | 2014-07-17 | 2014-10-15 | 贵阳新光电气有限公司 | Generator rotor winding temperature online monitoring method |
| CN105115620A (en) * | 2015-07-15 | 2015-12-02 | 广州日滨科技发展有限公司 | Winding temperature detection method and system and overheating protection method and system of three-phase synchronous door motor |
| CN105115620B (en) * | 2015-07-15 | 2018-11-06 | 日立楼宇技术（广州）有限公司 | The winding temperature detection of three-phase synchronous door motor and method for excessive heating protection and system |
| CN108458812A (en) * | 2017-02-20 | 2018-08-28 | 南京天擎汽车电子有限公司 | The acquisition methods and acquisition device of motor winding temperature |
| CN108458812B (en) * | 2017-02-20 | 2020-11-17 | 南京天擎汽车电子有限公司 | Method and device for acquiring temperature of motor winding |
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| Publication number | Publication date |
|---|---|
| WO2014146422A1 (en) | 2014-09-25 |
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Application publication date: 20130828 |