CN101915623B - Method for measuring temperature of rotor of brushless exciting generator - Google Patents
Method for measuring temperature of rotor of brushless exciting generator Download PDFInfo
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- CN101915623B CN101915623B CN2010102190394A CN201010219039A CN101915623B CN 101915623 B CN101915623 B CN 101915623B CN 2010102190394 A CN2010102190394 A CN 2010102190394A CN 201010219039 A CN201010219039 A CN 201010219039A CN 101915623 B CN101915623 B CN 101915623B
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Abstract
The invention provides a method for measuring the temperature of a rotor of a brushless exciting generator. The method is characterized by comprising the following steps of: evaluating the actual current value If of the rotor first; then evaluating the resistance value Rf of a winding of a thermal rotor of the generator by using an interpolation method; evaluating the voltage value Uf of the rotor according to the resistance value Rf of the winding of the thermal rotor of the generator; calculating the temperature value Tf of the thermal rotor of the generator; then modifying the obtained values above by using the boundary conditions of the generator; finally, displaying the modified values. The method for measuring the temperature of the rotor of the brushless exciting generator based on calculation, which is provided by the invention, solves the problem that the current and voltage of the rotor of the brushless rotary exciting generator are difficult to measure, and additional devices including coils for measuring current and slip rings for measuring the voltage of the rotor are not required, so that the operating failure rate of the generator can be reduced, the reliability of the normal operation of the generator is improved, and the daily maintenance and repair burden is reduced.
Description
Technical field
The present invention relates to a kind of method for measuring temperature of rotor of brushless exciting generator.
Background technology
Nowadays, turbodynamo generally adopts two types of excitation modes---static excitation and brushless excitation.But in the generator of brushless excitation mode, rotor voltage and rotor current can't directly measure, and show the difficulty that becomes thereby Generator Rotor Temperature is measured.For realizing the demonstration of Generator Rotor Temperature, must develop a kind of measuring method.
Summary of the invention
The measuring method that the purpose of this invention is to provide a kind of Generator Rotor Temperature.
In order to achieve the above object, technical scheme of the present invention has provided a kind of method for measuring temperature of rotor of brushless exciting generator, it is characterized in that, step is:
Step 1, obtain generator unit stator three-phase voltage U a, Ub, Uc through the meter meter, generator unit stator three-phase current Ia, Ib, Ic and exciter excitation electric current I ef;
Step 2, calculate stator line voltage U, stator line current I, generator active power P, generator reactive power Q and generator power factor COS Φ;
Step 3, the sub-line voltage U of setting are rated voltage, and the stator line current I and the generator power factor COS Φ that calculate according to step 2 simultaneously try to achieve center roller electric current I fx according to generator V-characteristic utilization method of interpolation again;
Step 4, try to achieve actual rotor electric current I f, exciter field current Ief that obtains according to step 1 again and the relation curve of the hot rotor winding resistance of generator Rf, i.e. exciter family curve, the utilization method of interpolation is tried to achieve the hot rotor winding resistance of generator Rf;
Step 5, obtain rotor voltage Uf according to formula Uf=Rf * If;
Step 6, according to formula Tf-T0=(234.5+T0) (Rf-R0)/R0 calculates the hot temperature of rotor Tf of generator, wherein, T0 is a generator cold conditions temperature of rotor, Rf is the hot rotor winding resistance of generator, R0 is a generator cold conditions rotor winding resistance;
Step 7, utilize the generator boundary condition---rotor voltage, the practical measurement of current value of generator hydrogen temperature and ad eundem unit static excitation mode, rotor voltage Uf, actual rotor electric current I f and the hot temperature of rotor Tf of the generator calculated value of brushless excitation unit are revised;
Step 8, the hot temperature of rotor Tf of revised rotor voltage Uf, actual rotor electric current I f and generator is shown; Perhaps the hot temperature of rotor Tf of rotor voltage Uf, actual rotor electric current I f and generator is seen off from device terminals, so that use through transmitter.
A kind of method for measuring temperature of rotor of brushless exciting generator based on calculating provided by the invention has solved the difficult problem that brushless rotating excitation generator amature voltage and current is difficult to measure; And need not installation of additional equipment, comprise the coil that common measurement electric current is used and measure the slip ring that rotor voltage is used.Can reduce the generator operation failure rate like this, improve the normal reliability of operation of generator, and alleviate the burden of daily servicing and maintenance.
Description of drawings
Fig. 1 is generator zero load and zero power-factor characteristics;
Fig. 2 is the generator short circuit family curve;
Fig. 3 is a 5800kW exciter family curve.
Embodiment
Specify the present invention below in conjunction with embodiment.
Embodiment
The invention provides a kind of method for measuring temperature of rotor of brushless exciting generator, step is:
The first step: through the meter meter, obtain generator unit stator three-phase voltage U a, Ub, Uc, generator unit stator three-phase current Ia, Ib, Ic and exciter excitation electric current I ef.
Second step: calculate stator line voltage U, stator line current I, generator active power P, generator reactive power Q and generator power factor COS Φ.
The 3rd step: to set stator line voltage U be rated voltage, calculate under the condition of stator line current I, generator power factor COS Φ and try to achieve center roller electric current I fx according to 1100MW generator V-characteristic utilization method of interpolation; Ifx=f (cos φ; I), the interpolation calculation method is following:
Under the cos φ that confirms, If=fcos φ (I), If are the rotor current values that calculates through V-characteristic, and fcos φ (I) is meant funtcional relationship, and the function f of I is calculated in expression through cos φ.
When cos φ x is between cos φ 1 and cos φ 2, try to achieve the value of If on two curves; Cos φ 1 and cos φ 2 are preset values that exist in the V-type curve; Behind the cos φ x that calculates; Must find corresponding cos φ 1 and cos φ 2, make cos φ x drop on cos φ 1 and cos φ 2 interval interior (cos φ 1＜cos φ x＜cos φ 2), can carry out following interpolation calculation thus.
Have: If1=fcos φ 1 (I); If2=fcos φ 2 (I)
The utilization linear interpolation method is tried to achieve: Ifx=fcos φ 1 (I)+[fcos φ 2 (I)-fcos φ 1 (IG)]/Δ T1}* Δ Tx, wherein, Δ T1=cos φ 2-cos φ 1, Δ Tx=cos φ x-cos φ 1.
The 4th step: because exciter field current Ief is known; The calculating of actual rotor electric current I f then need divide the condition discussion; When the machine terminal shortcircuit (voltage that definition is lower than the rated voltage certain percentage is short-circuit voltage); Will calculate consideration this moment according to the situation of short circuit, improves the accuracy of calculating.Fig. 2 is the generator short circuit family curve, and the relation of rotor current and stator current can concern thus tries to achieve, and note is made If=f (I)
In other cases, according to center roller electric current I fx and stator line voltage U, try to achieve actual rotor electric current I f according to no-load curve and zero power-factor characteristics (as shown in Figure 1) utilization method of interpolation again.Note it being the actual stator voltage U here, here just to the replacement of rated voltage in the first step, the relations I f=f shown in utilization is schemed (U, Un Ifx), try to achieve final rotor current:
After trying to achieve actual rotor electric current I f; Relation curve according to exciter field current Ief and rotor current And if the hot rotor winding resistance of generator Rf; Be exciter family curve (as shown in Figure 3), the utilization method of interpolation is tried to achieve the hot rotor winding resistance of generator Rf, Rf=f (If; Ief);, the interpolation calculation formula is: in
computing formula, (R1, If1), (R2, If2) are the corresponding rotor resistance value of the variant load characteristic that prestores and two groups of data in the rotor current value; When through before calculate rotor current Ifx after; Must find such If1 and If2, make the value of Ifx belong to interval interior (If1＜Ifx＜If2), can carry out interpolation calculation thus of If1 and If2.
The 7th step: can try to achieve rotor voltage Uf according to formula Uf=Rf * If.
The 8th step: the hot temperature of rotor Tf of generator is the function of the hot rotor winding resistance of generator Rf, generator cold conditions rotor winding resistance R0 (promptly 25 ℃ time rotor winding resistance) and generator cold conditions temperature of rotor T0; Be designated as Tf=f (Rf, R0, T0); This is Rf wherein; R0, T0 are the value of trying to achieve or having provided, so can calculate the hot temperature of rotor Tf of generator.Wherein computing formula be Tf-T0=(234.5+T0) (Rf-R0)/R0.
The 9th step: utilize the generator boundary condition---rotor voltage, the practical measurement of current value of generator hydrogen temperature and ad eundem unit (like 300MW and 600MW) static excitation mode revised rotor voltage, electric current and the temperature computation value of above-mentioned brushless excitation unit.
The tenth step: finally be shown on the LCD on the control panel, realize demonstration in the face of object, perhaps can be through the transmitter of 4～20MA with rotor voltage, rotor current, temperature of rotor is seen off from device terminals, so that use.
The invention solves the difficult problem that brushless rotating excitation generator amature voltage and current is difficult to measure; And need not installation of additional equipment, comprise the coil that common measurement electric current is used and measure the slip ring that rotor voltage is used.Reduce the generator operation failure rate like this, improved the normal reliability of operation of generator, and alleviated the burden of daily servicing and maintenance.
Claims (1)
1. a method for measuring temperature of rotor of brushless exciting generator is characterized in that, step is:
Step 1, obtain generator unit stator three-phase voltage U a, Ub, Uc through the meter meter, generator unit stator three-phase current Ia, Ib, Ic and exciter excitation electric current I ef;
Step 2, calculate stator line voltage U, stator line current I, generator active power P, generator reactive power Q and generator power factor COS Φ;
Step 3, the sub-line voltage U of setting are rated voltage, and the stator line current I and the generator power factor COS Φ that calculate according to step 2 simultaneously try to achieve center roller electric current I fx according to generator V-characteristic utilization method of interpolation again;
Step 4, try to achieve actual rotor electric current I f; Exciter field current Ief that obtains according to step 1 again and the relation curve of the hot rotor winding resistance of generator Rf; It is the exciter family curve; The utilization method of interpolation is tried to achieve the hot rotor winding resistance of generator Rf, and the computing method of said actual rotor electric current I f are: when the machine terminal shortcircuit, try to achieve actual rotor electric current I f according to the generator short circuit family curve; In other cases, according to the stator line voltage U that center roller electric current I fx and said step 2 calculate, try to achieve actual rotor electric current I f according to no-load curve and zero power-factor characteristics utilization method of interpolation again;
Step 5, obtain rotor voltage Uf according to formula Uf=Rf * If;
Step 6, according to formula Tf-T0=(234.5+T0) (Rf-R0)/R0 calculates the hot temperature of rotor Tf of generator, wherein, T0 is a generator cold conditions temperature of rotor, Rf is the hot rotor winding resistance of generator, R0 is a generator cold conditions rotor winding resistance;
Step 7, utilize the generator boundary condition---rotor voltage, the practical measurement of current value of generator hydrogen temperature and ad eundem unit static excitation mode, rotor voltage Uf, actual rotor electric current I f and the hot temperature of rotor Tf of the generator calculated value of brushless excitation unit are revised;
Step 8, the hot temperature of rotor Tf of revised rotor voltage Uf, actual rotor electric current I f and generator is shown; Perhaps the hot temperature of rotor Tf of rotor voltage Uf, actual rotor electric current I f and generator is seen off from device terminals, so that use through transmitter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102510256B (en) * | 2011-10-31 | 2015-08-05 | 上海电气电站设备有限公司 | A kind of method of convenient drafting generator characteristic |
| CN102564626A (en) * | 2012-02-06 | 2012-07-11 | 北京广利核***工程有限公司 | Method for measuring temperature of rotor of brushless exciter under real-time working condition |
| CN102661814B (en) * | 2012-05-11 | 2013-10-09 | 南京财经大学 | Realizing method of thermocouple temperature transmitter |
| 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 |
| CN104184122B (en) * | 2013-05-23 | 2017-06-06 | 南京保合太和电力科技有限公司 | Rotor ring short circuit or jumper miscarrying guard method and device |
| 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 |
| CN109871556B (en) * | 2017-12-04 | 2023-05-26 | 中国船舶重工集团海装风电股份有限公司 | Rotor winding temperature calculation method and system of doubly-fed asynchronous generator |
| CN108919123B (en) * | 2018-08-20 | 2020-06-09 | 中车永济电机有限公司 | Brushless excitation generator measuring device and measuring method thereof |
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