CN103558469B - Adopt the high-power transformer no-load test method of filter compensation technology - Google Patents
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Abstract
A kind of high-power transformer no-load test method adopting filter compensation technology, comprise the intermediate transformer of AC-testing supply and the tested transformer of secondary connection connected successively, it is characterized in that: between described intermediate transformer and tested transformer, be connected in parallel one or more groups hv filtering device, described hv filtering device is higher hamonic wave RLC series filter.The present invention proposes a kind of high-power transformer test unit based on compensation filter complex technique, solve in the test of current high-power transformer for the contradiction between waveform quality requirement and power supply capacity, can complementation test current first harmonics, also can harmonic wave in filtering test current, remarkable reduction experiment power supply capacity, improves trial voltage waveform; And wave filter works in the loop in unloaded boost process always, do not need high pressure switching, can not produce transient overvoltage, empirical risk coefficient greatly reduces.
Description
Technical field
The present invention relates to high-power transformer experimental technique field, is a kind of high-power transformer no-load test method adopting filter compensation technology specifically.
Background technology
Large-scale power transformer is one of equipment most important, the most expensive in power transmission and transformation system, and its reliability is directly connected to power system safety and stability and runs.Before transformer dispatches from the factory or overhaul puts into operation, need test, to check inside transformer whether existing defects, can put into operation safely.No-load Test of Transformer can find the quality problems of transformer core and winding, is one of the pilot project that must do of transformer.
At present, the typical no-load test loop of domestic and international high-power transformer is made up of experiment power supply, middle change, tested change and measuring system.Experiment power supply output voltage, is added in tested change two ends, provides the voltage waveform needed for test after centre becomes boosting.Experiment power supply generally adopts Synchronous generator or pressure regulator.
During No-load Test of Transformer, the magnetization curve due to iron core is nonlinear, and under sinusoidal excitation, no-load current, containing a large amount of higher hamonic wave, is non-sinusoidal.Especially transformer core saturated after, in no-load current, perceptual idle component increases severely.Large-scale power transformer capacity is high, and impedance is large, and non-sinusoidal no-load current can cause no-load test voltage waveform to distort, and affects the Measurement accuracy of no-load test parameter.Therefore, define in No-load Test of Transformer in standard " power transformer test directive/guide " (JB/T501-2006), the relative deviation of shape correction factor d(mean voltage meter reading U ' and effective voltmeter reading U, i.e. d=(U'-U)/U') be less than or equal to 3%.
No-load voltage waveform produces when the basic reason distorted is that non-sinusoidal no-load current flows through element impedance in test loop and produces pressure drop; Especially, after tested transformer core is saturated, distort more obvious.Improve voltage waveform quality to start with from two aspects: one is increase power supply capacity, and two is reduce impedance loop.
For the power transformer of UHV (ultra-high voltage) and extra-high voltage, increase power supply capacity very difficult, because according to practical experience, it is tested change rated capacity that no-load test power supply capacity gets 0.1Sn(Sn) left and right could meet wave form distortion requirement, and cost is too high, investment large, test unit is too huge.
Therefore, in large-scale power transformer no-load test, take the method reducing impedance loop to carry out warranty test voltage waveform distortion more and meet and will impose.At present, conventional is high pressure switching Reactive Power Device (as Capacitor banks etc.) both at home and abroad, and switching high-pressure reactive compensation device when namely iron core is tending towards saturated in No-load Test of Transformer, in order to compensate the perceptual weight in no-load current.Such as, the method utilizing Capacitor banks to carry out reactive-load compensation in transformer loss test is disclosed in Chinese invention patent CN200810020115.1; And for example, a kind of device utilizing the Capacitor banks of band tap to carry out transformer test compensation is disclosed in Chinese utility model patent CN200820014071.7.
The compensation of high-voltage capacitance to fundamental frequency component perceptual in no-load current has certain effect, but has amplification on the contrary to the harmonic component in no-load current, causes the larger distortion of voltage waveform.Meanwhile, switching Shunt compensation capacitor can produce transient overvoltage, and the highest meeting exceedes 1.26 times of rated voltage, may cause oscillation circuit, there is certain risk.
Therefore, study pratical and feasible, available high-power transformer test compensation technique, reduce experiment power supply capacity, improving test waveform quality, is problem demanding prompt solution.Further developing especially along with extra-high voltage alternating current-direct current, can provide portable high-power transformer (comprising converter power transformer) the test unit application prospect of high-quality trial voltage day by day wide, study novel transformer test and compensation technique extremely urgent.
Summary of the invention
The present invention is directed to the existing problems of prior art, a kind of high-power transformer no-load test method adopting filter compensation technology is proposed, can solve for the contradiction between waveform quality requirement and power supply capacity in the test of current high-power transformer preferably, for transformer test technology and complete equipment play to scene, miniaturization development the effect of actively promoting.
The high-power transformer no-load test method of described employing filter compensation technology, connect AC-testing supply, intermediate transformer and tested transformer successively, it is characterized in that, the hv filtering device of one or more groups higher hamonic wave RLC series connection is connected at the primary parallel of tested transformer, then with without capacitance compensation and the hv filtering device accessed all the time compensates the no-load test of carrying out tested transformer, to realize not increasing the high-power transformer no-load test under no-load test power supply capacity, not deteriorated no-load voltage waveform quality requirements.
National grid issue new edition power industry compulsory standard " electrical safe working order " regulation: electric pressure 1000V and above be high voltage electric equipment.
Low voltage filter or the on high-tension side capacitance compensation wave filter of the hv filtering device that described higher hamonic wave RLC connects and low-pressure side are distinct, and capacitance compensation needs switching access stage by stage, can produce the risk of transient overvoltage.
Determine the parameter of resistance, electric capacity, inductance element in the hv filtering device that described higher hamonic wave RLC connects as follows:
One, the rated voltage U of described hv filtering device is determined
fNwith harmonic wave electric current I
fN:
Rated voltage calculates with following formula: U
fN=K × U
m,
U in formula
fNfor the rated voltage of hv filtering device, K is safety coefficient, U
mfor the highest trial voltage, getting safety coefficient K is 1.15;
Harmonic current I
fNfor the harmonic current components corresponding to hv filtering device characteristic frequency λ, described hv filtering device characteristic frequency λ is the odd-multiple of tested transformer rated frequency, and described harmonic current components is the corresponding higher harmonic current of tested transformer;
Two, the capacity S of hv filtering device is determined
f, quality factor q:
The capacity S of hv filtering device
fcalculate with following formula:
S
f=U
m×I
fN，
Wherein U
mfor the highest trial voltage, I
fNfor the harmonic current components corresponding to filter characteristic frequency lambda;
The span of described quality factor q is 10≤Q≤50;
Three, capacitance, inductance value, the resistance value of described hv filtering device is determined respectively with following formula:
In formula, C is the capacitance of hv filtering device, and L is the inductance value of hv filtering device, and R is the resistance value of hv filtering device, S
ffor the capacity of hv filtering device, U
fNfor the rated voltage of hv filtering device, f is experiment power supply frequency, and λ is the characteristic frequency of hv filtering device, and Q is the quality factor of hv filtering device.
The highest trial voltage provides according to testing regulations (GB) and transformer rated voltage.
As a kind of value embodiment of quality factor, the quality factor value 40 of hv filtering device.
A kind of embodiment, two groups of hv filtering devices are connected at the primary parallel of tested transformer, setting characteristic frequency is respectively three times of power frequencies and five times of power frequencies, and calculates harmonic current and capacity respectively, determines the resistance of two groups of hv filtering devices, inductance, capacitance parameter respectively.
Described AC-testing supply is the power supply that high-voltage variable frequency power source or genset connect pressure regulator composition.
The present invention's advantage is compared to existing technology: utilize hv filtering device to test compensation system as large-scale power transformer, can complementation test current first harmonics, also can harmonic wave in complementation test electric current, effectively can improve trial voltage waveform and reduce aberration rate, and then significantly reduce experiment power supply capacity, thus make experiment power supply miniaturization, reduce transportation cost; And wave filter works in the loop in unloaded boost process always, do not need high pressure switching, can not produce transient overvoltage, empirical risk coefficient greatly reduces.
Accompanying drawing explanation
Fig. 1 is high-power transformer no-load test major loop schematic diagram,
Fig. 2 a is the equivalent circuit figure under no-load test median filter works in first-harmonic,
Fig. 2 b is the equivalent circuit figure under no-load test median filter works in harmonic wave.
In figure: 1-AC-testing supply, 2-intermediate transformer, 3-hv filtering device group, 4-tested transformer.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described: as shown in fig. 1, the high-power transformer no-load test method of described employing filter compensation technology, connect AC-testing supply 1, intermediate transformer 2 and tested transformer 4 successively, the hv filtering device 3 of one or more groups higher hamonic wave RLC series connection is connected at the primary parallel of tested transformer 4, then no-load test is carried out to tested transformer, to realize not increasing the high-power transformer no-load test under no-load test power supply capacity, not deteriorated no-load voltage waveform quality requirements.
Determine the parameter of resistance, electric capacity, inductance element in the hv filtering device 3 that described higher hamonic wave RLC connects as follows:
One, the rated voltage U of described hv filtering device 3 is determined
fNwith harmonic wave electric current I
fN:
Rated voltage calculates with following formula: U
fN=K × U
m,
U in formula
fNfor the rated voltage of hv filtering device, K is safety coefficient, U
mfor the highest trial voltage, getting safety coefficient K is 1.15;
Harmonic current I
fNfor the harmonic current components corresponding to hv filtering device characteristic frequency λ, described hv filtering device characteristic frequency λ is the odd-multiple of tested transformer rated frequency, and described harmonic current components is the corresponding higher harmonic current of tested transformer;
Two, the capacity S of hv filtering device is determined
f, quality factor q:
The capacity S of hv filtering device
fcalculate with following formula:
S
f=U
m×I
fN，
Wherein U
mfor the highest trial voltage, I
fNfor the harmonic current components corresponding to filter characteristic frequency lambda;
The span of described quality factor q is 10≤Q≤50;
Three, capacitance, inductance value, the resistance value of described hv filtering device is determined respectively with following formula:
In formula, C is the capacitance of hv filtering device, and L is the inductance value of hv filtering device, and R is the resistance value of hv filtering device, S
ffor the capacity of hv filtering device, U
fNfor the rated voltage of hv filtering device, f is experiment power supply frequency, and λ is the characteristic frequency of hv filtering device, and Q is the quality factor of hv filtering device.
As a kind of value embodiment of quality factor, the quality factor value 40 of hv filtering device 3.
A kind of embodiment, two groups of hv filtering devices 3 are being connected by the primary parallel of formula transformer 4, setting characteristic frequency is respectively third and fifth harmonic, and calculates harmonic current and capacity respectively, determines the resistance of two groups of hv filtering devices, inductance, capacitance parameter respectively.
As embodiment, described AC-testing supply 1 is the power supply that high-voltage variable frequency power source or genset connect pressure regulator composition.
Above-described embodiment feature can be applied in various embodiments mutually.
Described AC-testing supply 1 can adopt conventional high-power transformer experiment power supply, as heavy-duty generator group and pressure regulator; Also novel transformer test power supply can be adopted, as high-voltage variable frequency power source etc.
Described intermediate transformer 2 is for lifting test voltage, and both sides voltage is determined by electric power output voltage and tested time variant voltage grade, and capacity is determined jointly by experiment power supply capacity and the middle impedance becoming self.
Each group of described hv filtering device group 3 is made up of electric capacity, inductance, resistance components in series by wave filter.Following wave filter all refers to the hv filtering device of single group.When hv filtering device is connected in parallel on tested transformer two ends, no-load current medium frequency equals the harmonic wave of filter characteristic frequency by complete filtering; For the component of frequency lower than filter characteristic frequency, wave filter is capacitive, can compensate the inductance current of iron core; For the harmonic component of frequency higher than filter characteristic frequency, wave filter is in perception, and inductance current is shunted (suppression).Therefore, wave filter can reduce the harmonic current flowing into experiment power supply, reduces harmonic voltage simultaneously.According to harmonic characteristic, select suitable filter characteristic frequency, wave filter shunting low-frequency harmonics while compensation first-harmonic can be made, and then improve the trial voltage waveform at tested transformer two ends, reduce experiment power supply capacity.
Utilize Analysis of Equivalent Circuit wave filter to the compensation effect of no-load current first-harmonic and harmonic wave, as shown in Fig. 2 a, 2b.For no-load current first-harmonic, because filter characteristic frequency is greater than power frequency, therefore loop median filter can be equivalent to capacitive load (as shown in Figure 2 a), and tested transformer presents great perception after saturation, wave filter can compensate this part inductance current, thus reduces no-load current first-harmonic size.For no-load current harmonic wave, due to the nonlinear magnetization effect of tested transformer core, tested change can be equivalent to a Harmonic Current and carry out analyzing (as shown in Figure 2 b).Now, middle change and experiment power supply partial circuit can be equivalent to inductive load; And filter characteristic frequency lower than or equal harmonic current frequency, also in perception; Therefore, wave filter can shunt harmonic wave, and then reduces the harmonic component flowing into experiment power supply.
Above-mentioned analysis shows, in high-power transformer no-load test, when core sataration no-load current distorts, hv filtering device can compensate no-load current first-harmonic, filter harmonic wave, improves trial voltage waveform, effectively reduces AC-testing supply capacity.
Implementing procedure of the present invention is described in detail below in conjunction with specific embodiment.What deserves to be explained is, embodiment that the present invention is not limited thereto, all applicable to other various types of high-power transformer tests.
Selection specific embodiment is: the single-phase converter power transformer of ± 800kV, and design parameter is as shown in table 1, and corresponding intermediate transformer parameter is as shown in table 2.
Table 1 ± 800kV converter power transformer major parameter:
Table 2 boosts variable element:
| Rated capacity | 10.5MVA | Short-circuit impedance | 6% |
| Low-pressure side rated voltage | 12kV | High-pressure side rated voltage | 145.5kV |
| Open circuit loss | 11kW | Load loss | 40kW |
Concrete computational analysis flow process is: in simulation analysis instrument (as PSCAD, Matlab etc.), set up analytical model according to the excitation curve of tested transformer.According to the circuit structure of Fig. 1, set up test loop analytical model.Wherein, power supply can be equivalent to the ideal source of volume-variable; Intermediate transformer does not consider state of saturation, can be equivalent to the transformer of band loss; Wave filter is rlc circuit, is made up of resistance, inductance, electric capacity.
Change the output voltage values of test middle ideal power supply, analyze the trial voltage at no-load current and tested transformer two ends, contrast adds wave filter before and after test power supply and middle transformer output power, the waveform correction coefficient d of trial voltage and total harmonic distortion THD.
The characterisitic parameter of wave filter comprises rated voltage U
fN, characteristic frequency λ, quality factor q, rated capacity S, the value of corresponding resistance, inductance, capacity cell can be calculated by these parameters.
In conjunction with aforementioned U
fN, λ, Q, S
f, can calculate: C=0.38uF, L=2.99H, R=70.65 Ω.
By above-mentioned analytical approach and flow process, shown in reckoner 1 ± the single-phase converter power transformer no-load test of 800kV in add correlation parameter before and after wave filter, result is: when not adding wave filter, and trial voltage is 1.1U
ntime, the waveform correction coefficient d=– 4.23%, total harmonic distortion THD=9.68% of trial voltage, it is 3140kVA that experiment power supply and middle change export applied power; Add U
fN=130kV, λ=150Hz, Q=40, S
fafter the wave filter of=2MVA, trial voltage is 1.1U
ntime, d=– 0.40%, THD=1.30%, experiment power supply and middle change output power 784kVA.
As can be seen here, the invention provides the high-power transformer test method based on compensation filter complex technique, the capacity of high-power transformer no-load test power supply can be effectively reduced, improve no-load test voltage waveform, solve the defect of prior art, have good actual application value.
Claims (4)
1. one kind adopts the high-power transformer no-load test method of filter compensation technology, connect AC-testing supply (1) successively, intermediate transformer (2) and tested transformer (4), it is characterized in that, the hv filtering device (3) of one or more groups higher hamonic wave RLC series connection is connected at the primary parallel of tested transformer (4), then with without capacitance compensation and the hv filtering device accessed all the time compensates the no-load test of carrying out tested transformer, to realize not increasing no-load test power supply capacity, high-power transformer no-load test under not deteriorated no-load voltage waveform quality requirements,
Determine the parameter of hv filtering device (3) interior resistance that described higher hamonic wave RLC connects, electric capacity, inductance element as follows:
One, the rated voltage U of described hv filtering device (3) is determined
fNwith harmonic wave electric current I
fN:
Rated voltage calculates with following formula: U
fN=K × U
m,
U in formula
fNfor the rated voltage of hv filtering device, K is safety coefficient, U
mfor the highest trial voltage, getting safety coefficient K is 1.15;
Harmonic current I
fNfor the harmonic current components corresponding to hv filtering device characteristic frequency λ, described hv filtering device characteristic frequency λ is the odd-multiple of tested transformer rated frequency, and described harmonic current components is the corresponding higher harmonic current of tested transformer;
Two, the capacity S of hv filtering device is determined
f, quality factor q:
The capacity S of hv filtering device
fcalculate with following formula:
S
f＝U
m×I
fN，
Wherein U
mfor the highest trial voltage, I
fNfor the harmonic current components corresponding to filter characteristic frequency lambda;
The span of described quality factor q is 10≤Q≤50;
Three, capacitance, inductance value, the resistance value of described hv filtering device is determined respectively with following formula:
In formula, C is the capacitance of hv filtering device, and L is the inductance value of hv filtering device, and R is the resistance value of hv filtering device, S
ffor the capacity of hv filtering device, U
fNfor the rated voltage of hv filtering device, f is experiment power supply frequency, and λ is the characteristic frequency of hv filtering device, and Q is the quality factor of hv filtering device.
2. the high-power transformer no-load test method of employing filter compensation technology according to claim 1, is characterized in that: the quality factor value 40 of hv filtering device (3).
3. the high-power transformer no-load test method of employing filter compensation technology according to claim 1, it is characterized in that: connected two groups of hv filtering devices (3) by the primary parallel of formula transformer (4), setting characteristic frequency is respectively third and fifth harmonic, and calculate harmonic current and capacity respectively, determine the resistance of two groups of hv filtering devices, inductance, capacitance parameter respectively.
4. the high-power transformer no-load test method of employing filter compensation technology according to claim 1, is characterized in that: described AC-testing supply (1) is the power supply that high-voltage variable frequency power source or genset connect pressure regulator composition.
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| CN110824260A (en) * | 2019-12-13 | 2020-02-21 | 吴江变压器有限公司 | Method for measuring and calculating no-load loss of transformer |
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