CN103338025B - Power Frequency Sensing Resonance Device and Method for Judging Power Frequency Series Resonant State by Frequency Modulation - Google Patents
Power Frequency Sensing Resonance Device and Method for Judging Power Frequency Series Resonant State by Frequency Modulation Download PDFInfo
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- CN103338025B CN103338025B CN201310219729.3A CN201310219729A CN103338025B CN 103338025 B CN103338025 B CN 103338025B CN 201310219729 A CN201310219729 A CN 201310219729A CN 103338025 B CN103338025 B CN 103338025B
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- 229960000909 sulfur hexafluoride Drugs 0.000 description 3
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Abstract
The invention discloses a power frequency induction adjustable resonance apparatus and a frequency modulation method thereof for determining a power frequency in-series resonant condition. A frequency conversion control power supply is included. The frequency conversion control power supply supplies voltage to an excitation transformer primary side. An excitation transformer secondary side is connected to a detected test product through a high voltage adjustable reactor. A voltage acquisition unit which is connected to the frequency conversion control power supply is also included. The frequency conversion control power supply gives signals according to acquired voltage signals so as to drive the inductance electric adjusting mechanism to adjust the high voltage adjustable electric reactor, so that the whole system performs resonance under the condition of the power frequency. According to the method, the frequency conversion power supply is adopted. When the electric reactor is adjusted well, a resonant point is searched in a mode of automatic resonance under the condition of low voltage. The resonance condition is determined through comparing the difference between the resonant frequency point and a frequency point of 50 Hz. An adjusting amount and a direction of a reactor air gap are pointed. The resonant condition can be rapidly determined and the power frequency resonance can be rapidly realized. Power frequency resonance boost when the voltage transformer is checked in an on-site mode is provided with convenience. The labor production efficiency is raised and the power frequency induction adjustable apparatus and a frequency modulation method thereof for determining a power frequency in-series resonant condition have a broad application prospect.
Description
Technical field
The invention belongs to a kind of industrial frequency inductance-regulation resonance device and adopt this device by mode of frequency regulation, to judge the method for power frequency series resonance state.
Background technology
The test method of series resonance extensively adopts at present, changeable in series resonance is three amounts, inductance, electric capacity and frequency, conventionally for test product test frequency 20 ~ 300Hz such as cables, think that it is equivalent to 50Hz, so the test of this class test product can be undertaken by changing the method for frequency, is conventionally called variable-frequency series-resonance.It is the situation of a certain frequency range that alternating current voltage frequency is not required or allow test frequency, can find accurately resonant frequency point by the frequency regulation resonance in this frequency range, thereby reduces better the requirement to power supply capacity.
But in power test, the capicitive sample having is tested to (such as the error test of voltage transformer), can only carry out under power frequency 50Hz, so way resonance that can only industrial frequency inductance-regulation.Because differing from test product under the frequency of power frequency, not possess the relative power frequency difference of data of power frequency equivalence or measurement larger, the test of this class test product must be carried out under power frequency, so we can only make its resonance under power frequency by change inductance, electric capacity or change both simultaneously, this class resonance is called power frequency series resonance.
The resonance device of this industrial frequency inductance-regulation is generally adjusting and the measurement of taking to carry out reactor inductance amount in uncharged situation, and then add some points and boost, but whether really in resonance condition, cannot know, even sometimes, because of off-resonance Frequency point, cross and have no idea far in test voltage to rise to desired value, often need repeatedly to adjust inductance, take time and effort.If it is bad that parameter regulates, under power frequency, resonance there will be resonance or owed resonance, had so just increased the capacity of power supply, had also affected the waveform of resonance.
Summary of the invention
The object of the invention is to overcome the problems of the prior art, what adopt is a kind of method that judges power frequency series resonance state by mode of frequency regulation, after first frequency modulation, regulate inductance to make it resonance under power frequency, and can find very fast, very accurately its real resonance frequency, have a good application prospect.
In order to achieve the above object, the technical solution adopted in the present invention is:
An industrial frequency inductance-regulation resonance device, is characterized in that, comprises variable frequency control power supply, and for excitation transformer primary side provides voltage, excitation transformer secondary side is connected to the external detected test product that needs power-frequency voltage by a high pressure Regulatable reactor; Described high pressure Regulatable reactor regulates air gap by inductance electric adjusting mechanism; Also comprise a voltage acquisition unit being connected with variable frequency control power supply, described variable frequency control power supply is according to the voltage signal collecting, and provides inductance electric adjusting mechanism described in signal driver and regulates described high pressure Regulatable reactor, makes whole system resonance under power frequency.
In described variable frequency control power supply, at least comprise a slice digital signal processor, the IPM that carries out voltage sample, power section drives signal and the generation of waveform, the feedback signal of protection is processed, the control of inductance electric adjusting mechanism.
In described variable frequency control power supply, also comprise another sheet digital signal processor, for controlling alternating interface between man and computer, management clock and data, show.
Two digital signal processors carry out communication by synchronous serial interface.
The method of the industrial frequency inductance-regulation resonance device frequency modulation judgement power frequency series resonance state based on described, is characterized in that, comprises the steps: (1) intelligent frequency-conversion control power supply output low pressure, makes the capacitor C X resonance of reactor and GIS, writes down resonance frequency f1 now;
(2) relation of more current resonance frequency f1 and power frequency 50Hz, if resonance frequency higher than 50Hz, shows that resonant inductance amount is less than the inductance value of needs, adjustment of inductance mechanism regulates the air gap of high pressure Regulatable reactor to reduce to increase inductance value automatically; If resonance frequency lower than 50Hz, shows that resonant inductance amount is greater than the inductance value of needs, adjustment of inductance mechanism regulates the air gap of high pressure Regulatable reactor to increase to reduce inductance value automatically;
(3) regulate inductance until resonance frequency, at 50Hz ± 0.5Hz scope interior resonance, is then boosted.
This method is a kind of method that judges power frequency series resonance state by mode of frequency regulation, power acquisition variable frequency power supply, after reactor regulates, by the mode from dynamic resonance under low pressure, find resonance point, relatively the difference of resonant frequency point and test frequency point 50Hz judges resonance situation, and point out regulated quantity and the direction of reactor air gap, and can realize fast industrial frequency resonance and judgement resonance condition, improve labor productivity.
The invention has the beneficial effects as follows: a kind of method that judges power frequency series resonance state by mode of frequency regulation provided by the invention, principle based on resonance, the advantage and the feature that possess all resonance, can perfection realizing power frequency boosts, can measure the capacitance of test specimen, the required inductance value of test specimen under the power frequency that can convert, charged adjusting reactor, make itself and test specimen resonance under power frequency, and can find accurately its true resonance frequency, solved the phenomenon of crossing resonance or owing resonance that resonance exists under power frequency, reduced the capacity of power supply, improve the waveform of resonance, power acquisition variable frequency power supply, after reactor regulates, by the mode from dynamic resonance under low pressure, find resonance point, relatively the difference of resonant frequency point and test frequency point 50Hz judges resonance situation, and point out regulated quantity and the direction of reactor air gap, this kind of method realized comparatively accurate resonance, fully guaranteed that resonance carries out at best state, can judge by this method the direction of the required adjusting inductance of resonance, then automatically regulate, greatly reduce labour intensity, can realize fast industrial frequency resonance and judgement resonance condition, improve labor productivity, have a good application prospect.
Accompanying drawing explanation
Fig. 1 realizes the schematic diagram of this method;
Fig. 2 is the Design of Digital Circuit schematic diagram of variable frequency control power supply of the present invention.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
As shown in Figure 1, industrial frequency inductance-regulation resonance device provided by the invention, comprises intelligent frequency-conversion control power supply, and for excitation transformer primary side provides voltage, excitation transformer secondary side is connected to the external detected test product that needs power-frequency voltage by a high pressure Regulatable reactor; High pressure Regulatable reactor regulates air gap by inductance electric adjusting mechanism; Also comprise a voltage acquisition unit being connected with variable frequency control power supply, variable frequency control power supply is according to the voltage signal that collects, provides inductance electric adjusting mechanism described in signal driver and regulates described high pressure Regulatable reactor, makes whole system resonance under power frequency.The high-voltage outlet terminal of high pressure Regulatable reactor connects the high-voltage terminal sleeve A of the voltage transformer pt unit in sulfur hexafluoride sealed combination electrical equipment GIS, and secondary part a, the x of the voltage transformer pt unit in sulfur hexafluoride sealed combination electrical equipment GIS provides on the high pressure sampled signal terminal that feeds back signal to intelligent frequency-conversion control power supply by electric pressure converter.
A method that judges power frequency series resonance state by mode of frequency regulation, concrete steps are as follows:
(1) intelligent frequency-conversion is controlled power supply output low pressure, makes the capacitor C X resonance of high pressure Regulatable reactor and sulfur hexafluoride sealed combination electrical equipment GIS, writes down resonance frequency now.
(2) relation of more current resonance frequency and 50Hz, if resonance frequency higher than 50Hz, shows that resonant inductance amount is less than the inductance value of needs, inductance electric adjusting mechanism regulates the air gap of high pressure Regulatable reactor to reduce to increase inductance value automatically; If resonance frequency lower than 50Hz, shows that resonant inductance amount is greater than the inductance value of needs, inductance electric adjusting mechanism regulates the air gap of high pressure Regulatable reactor to increase to reduce inductance value automatically.
(3) regulate high pressure Regulatable reactor inductance until resonance frequency at 50Hz place resonance, then boost.(because the Q value of resonance itself is higher, resonance has again certain passband, so also can meet certain limit (± 0.5Hz) while regulating near 50Hz, can boost).
As shown in Figure 2, the intelligent frequency-conversion of this method is controlled the effect that power supply has played changeable frequency, voltage variable, and according to the high-voltage signal judgement resonance condition collecting, and provide signal driver inductance electric adjusting mechanism adjusting high pressure Regulatable reactor, make whole system resonance under power frequency.
Intelligent frequency-conversion is controlled totally digitilized technology and senior integrated circuit for power acquisition, use two digital signal processor DSPs 1, DSP2, the DSP that the ShiTI company adopting in the present embodiment produces, model is respectively TM S320F2812, TMS320F206, and wherein TMS320F2812 carries out IPM driving signal and the generation of waveform of voltage sample, power section, the feedback signal of protection is processed, the control of inductance electric adjusting mechanism; TMS320F206 is mainly that the control of alternating interface between man and computer is, the management of clock and data demonstration etc.Two digital signal processor DSPs 1, DSP2 are connected and are realized communication by synchronous serial interface.
More than show and described basic principle of the present invention, principal character and advantage.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification, describes 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 (3)
1. an industrial frequency inductance-regulation resonance device, is characterized in that, comprises variable frequency control power supply, for excitation transformer primary side provides voltage; Described excitation transformer secondary side is connected to the external detected test product that needs power-frequency voltage by a high pressure Regulatable reactor; Described high pressure Regulatable reactor regulates air gap by inductance electric adjusting mechanism; Also comprise a voltage acquisition unit being connected with variable frequency control power supply, described variable frequency control power supply is according to the voltage signal collecting, and provides inductance electric adjusting mechanism described in signal driver and regulates described high pressure Regulatable reactor, makes whole system resonance under power frequency; In described variable frequency control power supply, at least comprise a slice digital signal processor, the IPM that carries out voltage sample, power section drives signal and the generation of waveform, the feedback signal of protection is processed, the control of inductance electric adjusting mechanism.
2. industrial frequency inductance-regulation resonance device according to claim 1, is characterized in that, also comprises another sheet digital signal processor in described variable frequency control power supply, for controlling alternating interface between man and computer, management clock and data, shows.
3. industrial frequency inductance-regulation resonance device according to claim 2, is characterized in that, two digital signal processors carry out communication by synchronous serial interface.
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| CN201310219729.3A CN103338025B (en) | 2013-06-05 | 2013-06-05 | Power Frequency Sensing Resonance Device and Method for Judging Power Frequency Series Resonant State by Frequency Modulation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107390105A (en) * | 2017-07-14 | 2017-11-24 | 江苏锦秀高压电器有限公司 | Industrial frequency inductance-regulation series resonance test system and its test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104635192A (en) * | 2014-12-10 | 2015-05-20 | 国网四川省电力公司电力科学研究院 | Power frequency resonance booster power supply used for verifying 550kV voltage transformer in GIS (gas insulated switchgear) |
| CN109856585B (en) * | 2019-02-28 | 2020-12-18 | 国网福建省电力有限公司莆田供电公司 | A method for judging resonance state in the process of voltage transformer series resonance boosting |
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| CN201937535U (en) * | 2011-02-22 | 2011-08-17 | 新华都特种电气股份有限公司 | Flux control and pulse width modulation (PWM) control based controllable reactor |
| CN102928705A (en) * | 2012-10-29 | 2013-02-13 | 河北省电力公司电力科学研究院 | Voltage transformer error test power frequency resonance step-up automatic test method in GIS (geographic information system) |
| CN203340031U (en) * | 2013-06-05 | 2013-12-11 | 国家电网公司 | Industrial frequency tuning resonance device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107390105A (en) * | 2017-07-14 | 2017-11-24 | 江苏锦秀高压电器有限公司 | Industrial frequency inductance-regulation series resonance test system and its test method |
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Address after: 100761 West Chang'an Avenue, Beijing, No. 86, No. Co-patentee after: Jiangsu Electric Power Company Patentee after: State Grid Corporation of China Co-patentee after: Electric Power Research Institute of Jiangsu Electric Power Company Co-patentee after: Wuhan pan electric Polytron Technologies Inc Address before: 100761 West Chang'an Avenue, Beijing, No. 86, No. Co-patentee before: Jiangsu Electric Power Company Patentee before: State Grid Corporation of China Co-patentee before: Electric Power Research Institute of Jiangsu Electric Power Company Co-patentee before: Wuhan Pandian Technology Co., Ltd. |