CN102053203A - Detection method and device for high-voltage power quality - Google Patents
Detection method and device for high-voltage power quality Download PDFInfo
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Abstract
The invention discloses a detection method and device for high-voltage power quality. A capacitive voltage divider is adopted for measuring a voltage signal, and a low-voltage current transformer with low energy consumption is adopted for measuring a current signal; the measured voltage signal and the measured current signal are simultaneously sent to a data acquisition and processing circuit suspended on a high-voltage side; and corresponding power quality information is calculated and analyzed, is sent to a comprehensive processing unit of a low-voltage part by an optical fiber, and is stored and displayed. The detection device can accurately measure a voltage harmonic signal, provides powerful data for monitoring harmonics, can accurately measure the current signal under the condition of small secondary load and owns wider linear working range. The data acquisition and processing circuit is suspended on the high-voltage side, which can avoid insulation between first load and secondary load, reduces the volume and the weight of the device and saves a great quantity of raw materials. The detection device can be directly installed on various routes when the existing route does not reserve the installation position, thus bringing convenience for improving systems.
Description
Technical field
The present invention relates to the electric energy quality monitoring technical field, specifically, is a kind of high voltage electric energy quality determining method and device.
Background technology
The quality of power supply is meant that the voltage that is related to power supply, using electricity system and equipment operate as normal thereof (or operation), the various indexs of electric current depart from the degree of specialized range.The detection of the quality of power supply has crucial meaning for improving power supply quality.The voltage signal of existing Power Quality Detection method is mainly taken from voltage transformer (VT), and current signal is mainly taken from current transformer.Power frequency component used capacitance type potential transformer in a large number, but capacitance type potential transformer can only be measured by a lot of at present countries in 110kV and above grade, can not be used for harmonic wave and detect.And current signal then can change the load of current transformer as taking from Verification of Measuring Current Transformer, may influence the accuracy of metering; If take from protective current transformer,, when then normally moving in system, secondary singal is little, and the accuracy of current transformer simultaneously is not high again, therefore can't guarantee precision of test result.
The quality of power supply comprises supply voltage deviation, frequency departure, imbalance of three-phase voltage, voltage fluctuation and flickering and harmonic wave etc., analyze the quality of power supply, need these workloads of complete detection, existing Power Quality Detection device is difficult to satisfy the demand of these complete detection.
Summary of the invention
The technical problem to be solved in the present invention provides accurate measuring voltage harmonic signal of a kind of energy and current signal, and volume is little, high voltage electric energy quality determining method and device that cost is low.
In order to solve the problems of the technologies described above, the invention provides a kind of high voltage electric energy quality determining method, comprising:
Adopt the capacitive divider measurement voltage signal, adopt low-voltage current mutual inductor to measure current signal;
Described voltage signal and current signal are sent to data acquisition and treatment circuit, and described data acquisition and treatment circuit are suspended in the high-pressure side;
Described data acquisition and treatment circuit obtain quality of power supply information according to described voltage signal and current signal computational analysis, and send to the overall treatment unit of low-pressure section.
Further, described data acquisition and treatment circuit can be supplied with work energy by voltage divider by getting.
Further, described data acquisition and treatment circuit send to described overall treatment unit by optical fiber with described quality of power supply information.
Further, for the three-phase and four-line electric system, measure the voltage signal and the current signal of each phase respectively and send to corresponding data acquisition and treatment circuit;
Described data acquisition and treatment circuit computational analysis respectively obtain each quality of power supply information mutually, and respectively described quality of power supply information are sent to described overall treatment unit;
The imbalance of three-phase voltage information that obtains is handled according to the quality of power supply information calculations of each phase that obtains in described overall treatment unit.
Further,, measure the voltage between phases of the current signal of A, C two-phase and AB phase, BC phase respectively, send to the composite measurement unit for the phase three-wire three electric system;
Described composite measurement unit according to AB mutually and BC voltage between phases mutually calculate the magnitude of voltage of AC phase, calculate the B phase current values according to the current signal of A, C two-phase, and further calculate and analyze the quality of power supply information that obtains.
The present invention also provides a kind of high voltage electric energy quality detection device, comprising:
Capacitive divider is used for measurement voltage signal and output;
Low-voltage current mutual inductor is used to measure current signal and output;
The computational analysis unit is used to receive the voltage signal of described capacitive divider output and the current signal of low-voltage current mutual inductor output, obtains quality of power supply information according to described voltage signal and described current signal computational analysis.
Further, comprising:
Three capacitive dividers are respectively applied for the voltage signal and the output of measuring each phase of three-phase and four-line electric system;
Three current transformers are respectively applied for the current signal and the output of measuring each phase of three-phase and four-line electric system;
Described computational analysis unit comprises three data collections and a treatment circuit and an overall treatment unit, wherein,
Three data collections and treatment circuit, be suspended in the high-pressure side, the capacitive divider and the low-voltage current mutual inductor that connect a phase respectively, be used to receive the voltage signal of corresponding capacitance voltage divider output and the current signal of corresponding low-voltage current mutual inductor output, computational analysis obtains each quality of power supply information mutually with current signal according to described voltage signal;
The overall treatment unit connects three data collections and treatment circuit respectively, is used to receive the quality of power supply information of each phase, and according to described quality of power supply information calculations imbalance of three-phase voltage information.
Further, comprising:
Two capacitive dividers are respectively applied for the AB that measures the phase three-wire three electric system and also export with BC voltage between phases signal mutually mutually;
Two low-voltage current mutual inductors are respectively applied for the single-phase current signal and the output of measuring phase three-wire three electric system A, C phase;
Described Computer Analysis unit comprises two single-phase measuring units, a composite measurement unit and a low pressure display terminal, wherein:
Two single-phase measuring units connect the capacitive divider and the low-voltage current mutual inductor of A, C two-phase respectively, be used to receive described AB mutually with the BC voltage between phases signal mutually and the single-phase current signal of A, C two-phase, send to the composite measurement unit;
The composite measurement unit connects two single-phase measuring units respectively, is used to receive the signal of described single-phase measuring unit output, obtains the voltage between phases and the B phase current of AC phase according to described calculated signals, and further calculates the quality of power supply information of each phase;
The low pressure display terminal connects described composite measurement unit, is used to receive described quality of power supply information and demonstration.
Further, also comprise:
Get the energy voltage divider, be used to described computational analysis unit that power supply is provided.
High voltage electric energy quality determining method of the present invention and the accurate measuring voltage harmonic signal of device, the problem that solution traditional approach harmonic wave can't be measured is for the monitoring of harmonic wave provides strong data; Under the very little situation of secondary load, can accurately measure current signal, and have the linear working range of broad.Adopt high voltage electric energy quality direct measuring method of the present invention, data acquisition and treatment circuit are suspended in the high-pressure side, can avoid the insulation between first and second, significantly reduce the volume and the weight of device, and save a large amount of starting material; The design of small size and lightweight can not reserved under the situation of installation site at existing line, and pick-up unit of the present invention directly is contained on the various circuits, makes things convenient for system to improve.
Description of drawings
Fig. 1 is the theory diagram that high voltage electric energy quality detection device of the present invention is applied to the Application Example of three-phase and four-line electric system;
Fig. 2 is the theory diagram that high voltage electric energy quality detection device of the present invention is applied to the Application Example of phase three-wire three electric system.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments, can be implemented so that those skilled in the art can better understand the present invention also, but illustrated embodiment is not as a limitation of the invention.
The technical solution used in the present invention is, adopt the capacitive divider measurement voltage signal, adopt the low-power consumption low-voltage current mutual inductor to measure current signal, the voltage signal that measures and current signal sent to simultaneously be suspended on high-tension side data acquisition and treatment circuit, corresponding quality of power supply information calculations is analyzed out, and by preserving and show in the overall treatment unit that optical fiber sends to low-pressure section.Wherein the high-pressure side circuit power can provide by voltage divider by getting.
For the three-phase and four-line electric system, the mode that adopts the single-phase high voltage quality of power supply directly to detect.Each finishes data acquisition and calculating mutually respectively in the high-pressure side, all qualities of power supply of finishing except that degree of unbalancedness are calculated, and data are reached the overall treatment unit of low-pressure section by optical fiber, finish the calculating and the measurement of degree of unbalancedness according to the three-phase data by the overall treatment unit, and with demonstration as a result, teletransmission and statistics.
For the phase three-wire three electric system, adopt the direct detection mode of three-phase high-voltage electric energy quality.Wherein A, C two-phase are carried out the detection of single-phase electric energy quality respectively, and measure in the comprehensive unit mutually at B, by calculating AC voltage between phases and B phase current, then can obtain all quality of power supply information, again by B phase composite measurement unit by optical fiber with quality of power supply information be sent to that low-pressure side shows, teletransmission and statistics.
High voltage electric energy quality detection device of the present invention comprises:
Capacitive divider is used for measurement voltage signal and output;
Low-voltage current mutual inductor is used to measure current signal and output;
The computational analysis unit is used to receive the voltage signal of described capacitive divider output and the current signal of low-voltage current mutual inductor output, obtains quality of power supply information according to described voltage signal and described current signal computational analysis.
As shown in Figure 1, as a kind of embodiment that is applied to the three-phase and four-line electric system, pick-up unit of the present invention comprises:
Three capacitive dividers 1 are respectively applied for the voltage signal and the output of measuring each phase of three-phase and four-line electric system;
Three low-voltage current mutual inductors 3 are respectively applied for the current signal and the output of measuring each phase of three-phase and four-line electric system;
The computational analysis unit has comprised three data collections and treatment circuit 4 and an overall treatment unit 6, wherein,
Three data collections and treatment circuit 4, be suspended in the high-pressure side, the capacitive divider 1 and the low-voltage current mutual inductor 3 that connect a phase respectively, be used to receive the voltage signal of corresponding capacitance voltage divider 1 output and the current signal of corresponding low-voltage current mutual inductor 3 outputs, computational analysis obtains each voltage deviation, frequency departure, voltage fluctuation and quality of power supply information such as flickering and harmonic wave mutually with current signal according to described voltage signal;
In addition, whenever comprise also that mutually get for one can voltage divider 2, be connected to data acquisition and the treatment circuit 4 of this phase, being used for obtaining from supply line that electric energy comes is that corresponding data acquisition and treatment circuit 4 are powered.
As shown in Figure 2, be applied to the embodiment of phase three-wire three electric system as another kind, pick-up unit of the present invention comprises:
Have a capacitive divider 7, a low-voltage current mutual inductor 9 and a single-phase measuring unit 10 respectively in the high-pressure side in A phase high-pressure side mutually with C, wherein, the mutually on high-tension side capacitive divider of A is used to measure the voltage between phases of AB phase, and the mutually on high-tension side capacitive divider of C is used to measure the voltage between phases signal of BC phase, A phase high-pressure side is respectively applied for the mutually on high-tension side low-voltage current mutual inductor 9 of C and measures A phase and C current signal mutually, and capacitive divider 7 summation current transformers 9 send to corresponding single-phase measuring unit 10 with voltage between phases signal and the single-phase current signal that records respectively; Single-phase measuring unit 10 sends to the mutually on high-tension side composite measurement of B unit 11 with corresponding voltage between phases signal and single-phase current signal;
B phase high-pressure side comprises a composite measurement unit 11, composite measurement unit 11 receives the signal of each single-phase measuring unit 10 output, obtain the voltage between phases signal and the B phase current of AC phase according to these calculated signals, and further calculate the quality of power supply information of each phase, comprise supply voltage deviation, frequency departure, voltage fluctuation and flickering, harmonic wave and imbalance of three-phase voltage etc.
Composite measurement unit 11 can send to the quality of power supply information that calculates low pressure display terminal 13 and show that low pressure display terminal 13 can also carry out teletransmission and statistics with quality of power supply information.
In A phase high-pressure side, B phase high-pressure side and C be arranged with that get can voltage divider 8 in the high-pressure side mutually, be respectively applied for into single-phase measuring unit 10 with in conjunction with measuring unit 11 power supplies.
Preferably, between each single-phase measuring unit 10 and the composite measurement unit 11, and all be connected by optical fiber 12 in conjunction with between measuring unit 11 and the low pressure display terminal 13.
The present invention adopts accurately measuring voltage harmonic signal of capacitive divider, solves the problem that the traditional approach harmonic wave can't be measured, for the monitoring of harmonic wave provides strong data; Adopt the low-voltage current mutual inductor of low-power consumption, under the very little situation of secondary load, can accurately measure current signal, and have the linear working range of broad; Adopt high voltage electric energy quality direct measuring method of the present invention, data acquisition and treatment circuit are suspended in the high-pressure side, can avoid the insulation between first and second, significantly reduce the volume and the weight of device, and save a large amount of starting material; The design of small size and lightweight can not reserved under the situation of installation site at existing line, directly is contained on the various circuits, makes things convenient for system to improve.
The above embodiment is the preferred embodiment that proves absolutely that the present invention lifts, and protection scope of the present invention is not limited thereto.Being equal to that those skilled in the art are done on basis of the present invention substitutes or conversion, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (9)
1. a high voltage electric energy quality determining method is characterized in that, comprising:
Adopt the capacitive divider measurement voltage signal, adopt low-voltage current mutual inductor to measure current signal;
Described voltage signal and current signal are sent to data acquisition and treatment circuit, and described data acquisition and treatment circuit are suspended in the high-pressure side;
Described data acquisition and treatment circuit obtain quality of power supply information according to described voltage signal and current signal computational analysis, and send to the overall treatment unit of low-pressure section.
2. high voltage electric energy quality determining method according to claim 1 is characterized in that, described data acquisition and treatment circuit can be supplied with work energy by voltage divider by getting.
3. high voltage electric energy quality determining method according to claim 1 is characterized in that, described data acquisition and treatment circuit send to described overall treatment unit by optical fiber with described quality of power supply information.
4. high voltage electric energy quality determining method according to claim 1 is characterized in that,
For the three-phase and four-line electric system, measure the voltage signal and the current signal of each phase respectively and send to corresponding data acquisition and treatment circuit;
Described data acquisition and treatment circuit computational analysis respectively obtain each quality of power supply information mutually, and respectively described quality of power supply information are sent to described overall treatment unit;
The imbalance of three-phase voltage information that obtains is handled according to the quality of power supply information calculations of each phase that obtains in described overall treatment unit.
5. high voltage electric energy quality determining method according to claim 1 is characterized in that,
For the phase three-wire three electric system, measure the voltage between phases of the current signal of A, C phase and AB phase, BC phase respectively, send to the composite measurement unit;
Described composite measurement unit calculates the B phase current values according to A, C phase current, and further calculates and analyze the quality of power supply information that obtains according to AB calculates the AC phase mutually with BC voltage between phases mutually magnitude of voltage.
6. a high voltage electric energy quality detection device is characterized in that, comprising:
Capacitive divider is used for measurement voltage signal and output;
Low-voltage current mutual inductor is used to measure current signal and output;
The computational analysis unit is used to receive the voltage signal of described capacitive divider output and the current signal of low-voltage current mutual inductor output, obtains quality of power supply information according to described voltage signal and described current signal computational analysis.
7. high voltage electric energy quality detection device according to claim 6 is characterized in that, comprising:
Three capacitive dividers are respectively applied for the voltage signal and the output of measuring each phase of three-phase and four-line electric system;
Three current transformers are respectively applied for the current signal and the output of measuring each phase of three-phase and four-line electric system;
Described computational analysis unit comprises three data collections and a treatment circuit and an overall treatment unit, wherein,
Three data collections and treatment circuit, be suspended in the high-pressure side, the capacitive divider and the low-voltage current mutual inductor that connect a phase respectively, be used to receive the voltage signal of corresponding capacitance voltage divider output and the current signal of corresponding low-voltage current mutual inductor output, computational analysis obtains each quality of power supply information mutually with current signal according to described voltage signal;
The overall treatment unit connects three data collections and treatment circuit respectively, is used to receive the quality of power supply information of each phase, and according to described quality of power supply information calculations imbalance of three-phase voltage information.
8. high voltage electric energy quality detection device according to claim 6 is characterized in that, comprising:
Two capacitive dividers are respectively applied for the AB that measures the phase three-wire three electric system and also export with BC voltage between phases signal mutually mutually;
Two low-voltage current mutual inductors are respectively applied for the single-phase current signal and the output of measuring phase three-wire three electric system A, C phase;
Described Computer Analysis unit comprises two single-phase measuring units, a composite measurement unit and a low pressure display terminal, wherein:
Two single-phase measuring units connect the capacitive divider and the low-voltage current mutual inductor of A, C two-phase respectively, be used to receive described AB mutually with the BC voltage between phases signal mutually and the single-phase current signal of A, C two-phase, send to the composite measurement unit;
The composite measurement unit connects two single-phase measuring units respectively, is used to receive the signal of described single-phase measuring unit output, obtains the voltage between phases and the B phase current of AC phase according to described calculated signals, and further calculates the quality of power supply information of each phase;
The low pressure display terminal connects described composite measurement unit, is used to receive described quality of power supply information and demonstration.
9. high voltage electric energy quality detection device according to claim 6 is characterized in that, also comprises:
Get the energy voltage divider, be used to described computational analysis unit that power supply is provided.
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| CN2010105317518A CN102053203A (en) | 2010-11-04 | 2010-11-04 | Detection method and device for high-voltage power quality |
| PCT/CN2011/081740 WO2012059061A1 (en) | 2010-11-04 | 2011-11-03 | Method and device for quality-monitoring of high-voltage electrical energy |
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