CN113484580A - Frequency converter output parameter deviation detection table - Google Patents
Frequency converter output parameter deviation detection table Download PDFInfo
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- CN113484580A CN113484580A CN202110641119.7A CN202110641119A CN113484580A CN 113484580 A CN113484580 A CN 113484580A CN 202110641119 A CN202110641119 A CN 202110641119A CN 113484580 A CN113484580 A CN 113484580A
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- 238000001914 filtration Methods 0.000 claims abstract description 36
- 238000012545 processing Methods 0.000 claims abstract description 31
- 230000032683 aging Effects 0.000 claims abstract description 18
- 238000005259 measurement Methods 0.000 claims abstract description 15
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention relates to a frequency converter output parameter deviation detection meter which comprises a detection meter body, wherein the detection meter body is provided with a current acquisition clamp (1) and a voltage measurement pen (2), an SPWM wave transmission acquisition module, a signal filtering processing module and a display panel which are sequentially connected are further arranged in the detection meter body, the SPWM wave transmission acquisition module acquires a three-phase sine wave current voltage effective value of a frequency converter through the current acquisition clamp (1) and the voltage measurement pen (2), the three-phase sine wave current voltage effective value after processing is sent to the display panel after processing is carried out through the signal filtering processing module, and the three-phase sine wave current voltage effective value after processing is displayed through the display panel. Compared with the prior art, the method has the advantages of timely mastering the integral aging condition of the frequency converter, improving the operation safety of the pump station and the like.
Description
Technical Field
The invention relates to the technical field of electrical equipment, in particular to a frequency converter output parameter offset detection table.
Background
As the internal analog sensor of the frequency converter ages, the output parameters of the frequency converter also deviate, such as waveform distortion, low-order harmonic content increase, three-phase asymmetry increase, carrier glitch increase and the like, and the deterioration of the output parameters reflects that the overall design life of the frequency converter is likely to be terminated. However, the SPWM modulated wave output by the frequency converter is neither a general high-frequency signal nor an equivalent power frequency signal, so that the three-phase current and voltage output by the frequency converter can not be effectively detected by a common digital or pointer multimeter, and the error is very large. Therefore, a proper meter is needed to accurately detect the three-phase output parameters of the frequency converter, and the output parameter deviation phenomenon of the frequency converter can be effectively predicted, so that the overall aging condition of the frequency converter can be mastered at the first time.
Chinese patent CN201910987999.6 discloses a marine static frequency converter, in which a signal detection module is provided to detect the output end of a rectifying and filtering circuit, but the detected contents are dc voltage signal, ac voltage signal and ac current signal for detecting the output of an inverter circuit, but with the aging of the frequency converter, the three detection indexes will produce large errors, which will cause the decrease of the mechanical performance of the motor and simultaneously affect the judgment of the whole life of the frequency converter by the working personnel.
Disclosure of Invention
The invention aims to provide a frequency converter output parameter offset detection table for overcoming the defect that the detection of the three-phase output parameters of the frequency converter in the prior art is not accurate enough.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a converter output parameter skew detects table, is equipped with current acquisition pincers and voltage measurement pen-shape metre including detecting the table body, detects this internal SPWM ripples variant that still is equipped with the connection gradually of table and sends collection module, signal filtering processing module and display panel, SPWM ripples variant sends collection module and passes through the three-phase sine wave current voltage virtual value that current acquisition pincers and voltage measurement pen-shape metre gathered the converter, will handle after signal filtering processing module handles three-phase sine wave current voltage virtual value sends to display panel, will handle by display panel three-phase sine wave current voltage virtual value shows.
Furthermore, the detection indexes of the frequency converter collected by the SPWM wave transmission collection module through the current collection clamp and the voltage measurement meter pen further comprise a sine wave negative sequence zero sequence effective value and a high frequency carrier amplitude.
The detection meter is characterized in that an early warning module is further arranged in the detection meter body and is respectively connected with the output end of the signal filtering processing module and the display panel.
Furthermore, a performance judgment interval corresponding to the three-phase sine wave current voltage effective value, the sine wave negative sequence zero sequence effective value and the high-frequency carrier amplitude is arranged in the early warning module, and the performance judgment interval comprises 3 performance levels of normal, slight aging and severe aging.
Further, if 2 slight aging performance grades or 1 severe aging performance grade appear in the three-phase sine wave current voltage effective value, the sine wave negative sequence zero sequence effective value and the high frequency carrier amplitude, the early warning module sends an alarm signal to the display panel, the display panel carries out early warning according to the alarm signal, and the early warning mode comprises light flickering or alarm character content displaying.
And the output end of the signal filtering processing module is connected with the display panel.
The current collection clamp and the voltage measurement meter pen are connected with the input end of the SPWM wave transmission collection module.
Still be equipped with the signal amplification module between SPWM ripples becomes to send collection module and the signal filtering processing module, amplify three-phase sine wave current voltage effective value, sine wave negative sequence zero sequence effective value and the high frequency carrier amplitude that collection module gathered with SPWM ripples becomes, and signal filtering processing module is again passed into.
Furthermore, the output end of the SPWM wave transmission acquisition module is connected with the input end of the signal amplification module, and the output end of the signal amplification module is connected with the input end of the signal filtering processing module.
And the filtering used by the signal filtering processing module is high-precision filtering.
Compared with the prior art, the three-phase sine wave current voltage effective value, the sine wave negative sequence zero sequence effective value and the high-frequency carrier amplitude which are output by the frequency converter are accurately measured through high-precision filtering of the signal filtering processing module, so that the output parameter deviation phenomenon of the frequency converter is predicted, the overall aging condition of the frequency converter is mastered in time, the influence of the aging of the frequency converter on a motor is avoided, and the operation safety of a pump station is improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Reference numerals:
1-current collection clamp; 2-Voltage measurement Meter Pen.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
The utility model provides a converter output parameter skew detects table, can measure the three-phase sine wave current voltage virtual value of converter output accurately, sine wave negative sequence zero sequence virtual value, and high frequency carrier amplitude, thereby foresee the output parameter skew phenomenon of converter, including detecting the table body, it is equipped with current acquisition pincers 1 and voltage measurement pen-shape metre 2 to detect the table body, it still is equipped with SPWM wave transmission collection module, signal filtering processing module and the display panel that connect gradually to detect this internal SPWM wave transmission collection module, SPWM wave transmission collection module passes through current acquisition pincers 1 and voltage measurement pen-shape metre 2 and gathers the three-phase sine wave current voltage virtual value of converter, will handle three-phase sine wave current voltage virtual value after the processing of signal filtering processing module and send to the display panel, will handle three-phase sine wave current voltage virtual value after by the display panel and show.
The SPWM wave transmitting and collecting module collects detection indexes of the frequency converter through the current collecting clamp 1 and the voltage measuring meter pen 2 and further comprises a sine wave negative sequence zero sequence effective value and a high frequency carrier amplitude.
The detection meter body is also internally provided with an early warning module which is respectively connected with the output end of the signal filtering processing module and the display panel.
The early warning module is internally provided with performance judgment intervals corresponding to the three-phase sine wave current voltage effective value, the sine wave negative sequence zero sequence effective value and the high-frequency carrier amplitude, and the performance judgment intervals comprise 3 performance levels of normal aging, slight aging and severe aging.
If 2 slight aging performance grades or 1 severe aging performance grade appear in three-phase sine wave current voltage effective value, sine wave negative sequence zero sequence effective value and the high frequency carrier amplitude, then early warning module sends alarm signal to display panel, and display panel carries out the early warning according to alarm signal, and the mode of early warning includes that light flickers or shows warning literal content.
The output end of the signal filtering processing module is connected with the display panel.
The current collection clamp 1 and the voltage measurement meter pen 2 are both connected with the input end of the SPWM wave transmission collection module.
Still be equipped with the signal amplification module between SPWM ripples becomes to send collection module and the signal filtering processing module, amplify three-phase sine wave current voltage effective value, sine wave negative sequence zero sequence effective value and the high frequency carrier amplitude that collection module gathered with SPWM ripples becomes to send, and then transmit signal filtering processing module.
The output end of the SPWM wave transmitting and collecting module is connected with the input end of the signal amplifying module, and the output end of the signal amplifying module is connected with the input end of the signal filtering processing module.
The filtering used by the signal filtering processing module is high-precision filtering.
Example one
The staff is connected current collection pincers 1 and voltage measurement pen-shape metre 2 with the converter that awaits measuring, and through SPWM wave transmission collection module gather the three-phase sine wave current voltage effective value of converter, sine wave negative sequence zero sequence effective value and high frequency carrier amplitude to send signal filtering processing module and handle, handle above-mentioned 3 converter detection index after accomplishing and can directly show at display panel, the staff can carry out the record according to the data on the display panel. Meanwhile, data processed and completed by the signal filtering processing module are sent to the early warning module, the early warning module judges the processed data through the set performance judgment interval, and if an early warning signal appears on the display panel, a worker maintains or replaces the measured frequency converter according to the early warning signal.
In addition, it should be noted that the specific embodiments described in the present specification may have different names, and the above descriptions in the present specification are only illustrations of the structures of the present invention. Minor or simple variations in the structure, features and principles of the present invention are included within the scope of the present invention. Various modifications or additions may be made to the described embodiments or methods may be similarly employed by those skilled in the art without departing from the scope of the invention as defined in the appending claims.
Claims (10)
1. The utility model provides a converter output parameter skew detects table, is equipped with current acquisition pincers (1) and voltage measurement pen-shape metre (2) including detecting the table body, detects the table body, its characterized in that, it sends collection module, signal filtering processing module and display panel to detect the SPWM ripples that this internal still is equipped with the SPWM ripples that connects gradually, SPWM ripples becomes to send collection module to gather the three-phase sine wave current voltage virtual value of converter through current acquisition pincers (1) and voltage measurement pen-shape metre (2), after signal filtering processing module handles three-phase sine wave current voltage virtual value sends to display panel, after will handling by display panel three-phase sine wave current voltage virtual value shows.
2. The frequency converter output parameter deviation detecting meter according to claim 1, wherein the SPWM wave transmission collection module collects detection indexes of the frequency converter through the current collection clamp (1) and the voltage measurement meter pen (2), and the detection indexes further comprise a sine wave negative sequence zero sequence effective value and a high frequency carrier amplitude.
3. The frequency converter output parameter deviation detection meter according to claim 2, characterized in that an early warning module is further arranged in the detection meter body, and the early warning module is respectively connected with the output end of the signal filtering processing module and the display panel.
4. The frequency converter output parameter deviation detecting meter according to claim 3, wherein a performance judging interval corresponding to the three-phase sine wave current voltage effective value, the sine wave negative sequence zero sequence effective value and the high frequency carrier amplitude is arranged in the early warning module, and the performance judging interval includes 3 performance levels of normal, slight aging and severe aging.
5. The frequency converter output parameter offset detection table according to claim 4, wherein if 2 slight aging performance levels or 1 severe aging performance level occurs in the three-phase sine wave current voltage effective value, the sine wave negative sequence zero sequence effective value and the high frequency carrier amplitude, the early warning module sends an alarm signal to a display panel, and the display panel performs early warning according to the alarm signal.
6. The table according to claim 1, wherein the output terminal of the signal filtering module is connected to a display panel.
7. The frequency converter output parameter deviation detection meter according to claim 1, characterized in that the current collection clamp (1) and the voltage measurement stylus (2) are both connected to the input of the SPWM wave transmission collection module.
8. The frequency converter output parameter offset detection meter of claim 1, wherein a signal amplification module is further disposed between the SPWM wave transmission acquisition module and the signal filtering processing module.
9. The frequency converter output parameter offset detection meter according to claim 8, wherein an output terminal of the SPWM wave transmission and acquisition module is connected to an input terminal of a signal amplification module, and an output terminal of the signal amplification module is connected to an input terminal of a signal filtering processing module.
10. The table according to claim 1, wherein the filtering applied by the signal filtering processing module is high-precision filtering.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110641119.7A CN113484580A (en) | 2021-06-09 | 2021-06-09 | Frequency converter output parameter deviation detection table |
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| CN202110641119.7A CN113484580A (en) | 2021-06-09 | 2021-06-09 | Frequency converter output parameter deviation detection table |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1779471A (en) * | 2004-11-17 | 2006-05-31 | 上海神源电气有限公司 | Frequency-converter ageing tester |
| CN101034117A (en) * | 2007-04-02 | 2007-09-12 | 武汉大学 | Power transmission line power frequency parameters measuring method and device |
| CN201118459Y (en) * | 2007-10-30 | 2008-09-17 | 新疆新能源股份有限公司 | High-frequency sine wave reverser |
| CN103207339A (en) * | 2013-04-28 | 2013-07-17 | 科博达技术有限公司 | Method and device for determining over-current of inverter |
| CN110572048A (en) * | 2019-10-17 | 2019-12-13 | 中国人民解放军海军工程大学 | marine static frequency converter |
-
2021
- 2021-06-09 CN CN202110641119.7A patent/CN113484580A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1779471A (en) * | 2004-11-17 | 2006-05-31 | 上海神源电气有限公司 | Frequency-converter ageing tester |
| CN101034117A (en) * | 2007-04-02 | 2007-09-12 | 武汉大学 | Power transmission line power frequency parameters measuring method and device |
| CN201118459Y (en) * | 2007-10-30 | 2008-09-17 | 新疆新能源股份有限公司 | High-frequency sine wave reverser |
| CN103207339A (en) * | 2013-04-28 | 2013-07-17 | 科博达技术有限公司 | Method and device for determining over-current of inverter |
| CN110572048A (en) * | 2019-10-17 | 2019-12-13 | 中国人民解放军海军工程大学 | marine static frequency converter |
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