CN201887763U - Impedance test device for low voltage electric power carrier channel - Google Patents
Impedance test device for low voltage electric power carrier channel Download PDFInfo
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- CN201887763U CN201887763U CN2010206454236U CN201020645423U CN201887763U CN 201887763 U CN201887763 U CN 201887763U CN 2010206454236 U CN2010206454236 U CN 2010206454236U CN 201020645423 U CN201020645423 U CN 201020645423U CN 201887763 U CN201887763 U CN 201887763U
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Abstract
The utility model relates to an impedance test device for a low voltage electric power carrier channel, which belongs to the field of power grid carrier communication, and aims at solving the problems of the existing method for measuring the carrier channel impedance that the frequency characteristic of a high frequency transformer and a resonant circuit affects the accuracy of the carrier measured value, the frequency point of the carrier measurement is limited, only the impedance magnitude can be measured, and the phase of the impedance can not be measured. The starting carrier control end of an embedded signal acquisition processing system of the impedance test device is connected with the signal control end of a DDS (digital display scope) carrier signal source, the test input and output end of the embedded signal acquisition processing system is connected with the test input and output end of a free coordinate axis vector measuring unit, the DDS carrier signal source, a high frequency power amplifier are sequentially connected with the primary side of the high frequency transformer, a load resistor R is connected between the high frequency power amplifier and the primary side of the high frequency transformer in series, the output end of the secondary edge of the high frequency transformer is connected with the input end of the coupling unit of a detuned circuit, and the output end of the coupling unit of the detuned circuit is connected with two low voltage power lines tested.
Description
Technical field
The utility model relates to low-voltage power carrier channel impedance testing apparatus, belongs to the network carrier communications field.
Background technology
Input impedance is the important parameter that characterizes the low-voltage power line transmission characteristic, and the input impedance on the low-voltage power line is closely related with the power carrier signal frequency of being transmitted.In theory, do not having load ideally, power line is an equally distributed transmission line of impedance, and under the influence of distributed inductance and distributed capacitance, input impedance should be reduced to certain value along with the increase of frequency; And when on the power line load being arranged, the input impedance of all frequencies all can reduce.But, because the difference of loadtype makes the impedance variation of different frequency also different, so actual conditions are very complicated.Because at random access of loadtype difference, load on the electrical network, cut out, the stoppage in transit of motor, startup, the open and close of household electrical appliance, the access of power factor compensation capacitance, reason such as remove, cause input impedance on the power line along with the variation of frequency acute variation, excursion has surpassed 1000 times, and input impedance is with the variation of frequency and do not meet the Changing Pattern that the increase with frequency under the general imagination reduces, even in contrast.Because these load meetings connect randomly on power line or disconnect, so input impedance still is the function of time, at different time, change by a relatively large margin takes place in the input impedance meeting of power line.
Therefore, because low-voltage power line input impedance is with touchdown point, time, carrier frequency and violent change at random, when design carrier wave transmitter, the output impedance that can't the guaranteed output amplifier and the input impedance of receiver are complementary, and bring very big difficulty to circuit design.
At present, the branch of known low voltage electric network is many, and power network inserts load and has diversity, complexity and time variation, and the carrier channel impedance of low voltage electric network does not match seriously, influences the real-time reliable transmission of power line carrier.Therefore, under the network operation state, need obtain corresponding data to the carrier channel impedance measurement of power network, so that optimize the power carrier signal transmission and guarantee power line carrier, PLC and the quality of checking meter, the carrier channel impedance measurement method is to adopt high frequency transformer and resonant circuit and low-voltage power line coupling at present, ratio-voltage is measured the modulus of impedance value, there is following subject matter in they: the frequency characteristic of high frequency transformer and resonant circuit influences the accuracy of carrier wave measured value, carrier wave measuring frequency point is limited, can only measure the modulus of impedance value, not the energy measurement impedance phase.
Summary of the invention
The utility model purpose is to influence the accuracy of carrier wave measured value for there is the frequency characteristic of high frequency transformer and resonant circuit in the method that solves the impedance of present measurement carrier channel, carrier wave measuring frequency point is limited, can only measure the modulus of impedance value, the problem of energy measurement impedance phase does not provide a kind of low-voltage power carrier channel impedance testing apparatus.
The utility model comprises DDS carrier signal source, high frequency power amplifier, high frequency transformer, detuned circuit coupling unit, embedded signal acquisition processing system and free reference axis vector test cell,
The startup carrier Control end of embedded signal acquisition processing system links to each other with the signal controlling end in DDS carrier signal source, and the test input/output terminal of embedded signal acquisition processing system links to each other with the test input/output terminal of free reference axis vector test cell,
The output in DDS carrier signal source links to each other with the input of high frequency power amplifier, the output of high frequency power amplifier links to each other with the former limit of high frequency transformer, load resistance R is connected between the former limit of high frequency power amplifier and high frequency transformer, the secondary output of high frequency transformer links to each other with the input of detuned circuit coupling unit, the output of detuned circuit coupling unit connects two tested low-voltage power lines
Free reference axis vector test cell is measured the original edge voltage of high frequency transformer and is flow through the electric current of the load resistance R that the former limit of high frequency transformer is provided with.
Advantage of the present utility model: adopt high frequency transformer and detuned circuit coupling unit to solve 80kHz-500kHz carrier wave frequency range coverage, adopt correcting unit to eliminate the frequency characteristic influence of high frequency transformer and resonant circuit, the measurement respectively that the method that adopts free reference axis vector test to combine with correcting unit has solved the mould value and the phase place of impedance.In the 80kHz-500kHz frequency range, can set a plurality of carrier wave impedance measurement Frequency points arbitrarily, can finish the carrier wave complex impedance measurement of setting-up time point, Frequency point, also can carry out the carrier wave complex impedance measurement in real time, automatically write down and store the complex impedance measurement value of setting-up time point every day, Frequency point, can reach by 8 days writing time.Instrument adopts Embedded System Design, and software is finished signals collecting, processing, Measurement Algorithm and telecommunication, adopts the GPRS communication mode, realizes the setting and the control of long-range impedance measurement, and the remote transmission of impedance measurement data.
Description of drawings
Fig. 1 is the test philosophy schematic diagram of impedance test device of the present utility model;
Fig. 2 is a circuit principle structure schematic diagram of the present utility model.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1 to Fig. 2, present embodiment comprises DDS carrier signal source 1, high frequency power amplifier 2, high frequency transformer 3, detuned circuit coupling unit 4, embedded signal acquisition processing system 5 and free reference axis vector test cell 6
The startup carrier Control end of embedded signal acquisition processing system 5 links to each other with the signal controlling end in DDS carrier signal source 1, and the test input/output terminal of embedded signal acquisition processing system 5 links to each other with the test input/output terminal of free reference axis vector test cell 6,
The output in DDS carrier signal source 1 links to each other with the input of high frequency power amplifier 2, the output of high frequency power amplifier 2 links to each other with the former limit of high frequency transformer 3, load resistance R is connected between the former limit of high frequency power amplifier 2 and high frequency transformer 3, the secondary output of high frequency transformer 3 links to each other with the input of detuned circuit coupling unit 4, the output of detuned circuit coupling unit 4 connects two tested low-voltage power lines
Free reference axis vector test cell 6 is measured the original edge voltage of high frequency transformers 3 and is flow through the electric current of the load resistance R that the former limit of high frequency transformer 3 is provided with.
The operation principle of the utility model measurement device: embedded signal acquisition processing system control DDS carrier signal source produces the carrier test signal of changeable frequency, amplification by high frequency power amplifier produces high frequency carrier power source signal and outputs to high frequency transformer, is sent to the low-voltage power line of tested impedance again by detuned circuit coupling and correcting unit.Embedded signal acquisition processing system control correcting unit, under each carrier frequency point to the correction of frequency characteristic and the record of high frequency transformer and detuned circuit coupling unit, the embedded signal acquisition processing system is controlled free reference axis vector test cell startup work simultaneously, the real part and the imaginary values of gathering the power line carrier complex impedance respectively by carrier wave impedance real part test cell and carrier wave imaginary impedance test cell, by program computing impedance mould value and phase value, and software program is finished the accurate measurement of complex impedance according to the correction of frequency characteristic value correction modulus of impedance value and the phase value of record.
Free reference axis vector test cell 6 comprises carrier wave impedance real part test cell 61 and carrier wave imaginary impedance test cell 62, carrier wave impedance real part test cell 61 is used for obtaining according to the detected signal of telecommunication real part of impedance of tested low-voltage power line, and export to embedded signal acquisition processing system 5, carrier wave imaginary impedance test cell 62 is used for obtaining according to the detected signal of telecommunication imaginary part of the impedance of tested low-voltage power line, and exports to embedded signal acquisition processing system 5.
The measurement task of the free reference axis vector test cell 6 of embedded signal acquisition processing system 5 controls, by real part and the imaginary values that carrier wave impedance real part test cell 61 and carrier wave imaginary impedance test cell 62 are gathered the power line carrier complex impedance respectively, calculate, revise the measured value that obtains modulus of impedance and phase place by program.
It can further include correcting unit 7, and the output of detuned circuit coupling unit 4 connects the input of correcting unit 7, and two outputs of correcting unit 7 connect the low-voltage power line of survey respectively.Correcting unit 7 is used for the output valve of detuned circuit coupling unit 4 is proofreaied and correct, and the acquisition methods of its correction coefficient is:
Emphasis has been considered the interior treatment for correcting to high frequency transformer 3 and detuned circuit coupling unit 4 of 80kHz-500kHz carrier wave frequency range scope, and correcting unit 7 is connected to detuned circuit coupling unit 4, also is connected to the low-voltage power line of tested impedance simultaneously.
Embedded signal acquisition processing system 5 control correcting units 7, under each carrier frequency point to the correction of frequency characteristic and the record of high frequency transformer 3 and detuned circuit coupling unit 4, reduce the measurement influence of the frequency characteristic of high frequency transformer 3 and detuned circuit coupling unit 4 by the software program correction, can carry out measurement less than the little impedance of 2 Ω.
It can further include embedded communication unit 8 and GPRS module 9, the communication input/output terminal of embedded communication unit 8 links to each other with the communication input/output terminal of embedded signal acquisition processing system 5, and the control signal of embedded communication unit 8 is launched by GPRS module 9.Embedded signal acquisition processing system and embedded communication unit carry out transfer of data by the RS232C interface, finish telecommunication by the GPRS module, can realize the function such as setting, real-time impedance measuring of setting, the test interval of Long-distance Control carrier wave testing impedance Frequency point.
The utility model instrument can be under mains supply, load operation state, measure 220V/380V power line A, B, C, three-phase carrier wave complex impedance simultaneously, carrier wave impedance frequency scope is 80kHz-500kHz, and A, B, C three-phase power line are by cable access carrier testing impedance instrument.The single-phase electricity line of force can be connected, also three-phase power line can be connected.
The utility model instrument has accomplished to set every day a plurality of Measuring Time points, carries out the carrier wave complex impedance measurement at the setting-up time point, can write down and store the complex impedance measurement value of setting-up time point every day automatically.Every day, the number of setting-up time point can be adjusted, and can carry out real-time carrier wave complex impedance measurement simultaneously.Can reach 8 days writing time.
The utility model instrument adopts Embedded System Design, and software is finished signals collecting, processing, Measurement Algorithm and telecommunication, adopts the GPRS communication mode, realizes the setting and the control of long-range impedance measurement, and the remote transmission of impedance measurement data.
Claims (4)
1. low-voltage power carrier channel impedance testing apparatus, it is characterized in that: it comprises DDS carrier signal source (1), high frequency power amplifier (2), high frequency transformer (3), detuned circuit coupling unit (4), embedded signal acquisition processing system (5) and free reference axis vector test cell (6)
The startup carrier Control end of embedded signal acquisition processing system (5) links to each other with the signal controlling end in DDS carrier signal source (1), the test input/output terminal of embedded signal acquisition processing system (5) links to each other with the test input/output terminal of free reference axis vector test cell (6)
The output in DDS carrier signal source (1) links to each other with the input of high frequency power amplifier (2), the output of high frequency power amplifier (2) links to each other with the former limit of high frequency transformer (3), load resistance R is connected between the former limit of high frequency power amplifier (2) and high frequency transformer (3), the secondary output of high frequency transformer (3) links to each other with the input of detuned circuit coupling unit (4), the output of detuned circuit coupling unit (4) connects two tested low-voltage power lines
Free reference axis vector test cell (6) is measured the original edge voltage of high frequency transformer (3) and is flow through the electric current of the load resistance R that the former limit of high frequency transformer (3) is provided with.
2. low-voltage power carrier channel impedance testing apparatus according to claim 1, it is characterized in that: free reference axis vector test cell (6) comprises carrier wave impedance real part test cell (61) and carrier wave imaginary impedance test cell (62), carrier wave impedance real part test cell (61) is used for obtaining according to the detected signal of telecommunication real part of impedance of tested low-voltage power line, and export to embedded signal acquisition processing system (5), carrier wave imaginary impedance test cell (62) is used for obtaining according to the detected signal of telecommunication imaginary part of the impedance of tested low-voltage power line, and exports to embedded signal acquisition processing system (5).
3. low-voltage power carrier channel impedance testing apparatus according to claim 1, it is characterized in that: it also comprises correcting unit (7), the output of detuned circuit coupling unit (4) connects the input of correcting unit (7), two outputs of correcting unit (7) are received the low-voltage power line of survey respectively, the built-in normal impedance of correcting unit (7), the real impedance values of normal impedance is known, measure the measured value that obtains built-in normal impedance by free reference axis vector test cell (6), finish impedance correction according to the margin of error of the real impedance values of the measured value of built-in normal impedance and built-in normal impedance, and then obtain tested accurately low-voltage power line impedence actual value tested low-voltage power line.
4. low-voltage power carrier channel impedance testing apparatus according to claim 1, it is characterized in that: it also comprises embedded communication unit (8) and GPRS module (9), the communication input/output terminal of embedded communication unit (8) links to each other with the communication input/output terminal of embedded signal acquisition processing system (5), and the control signal of embedded communication unit (8) is launched by GPRS module (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206454236U CN201887763U (en) | 2010-12-07 | 2010-12-07 | Impedance test device for low voltage electric power carrier channel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206454236U CN201887763U (en) | 2010-12-07 | 2010-12-07 | Impedance test device for low voltage electric power carrier channel |
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| CN201887763U true CN201887763U (en) | 2011-06-29 |
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| CN2010206454236U Expired - Lifetime CN201887763U (en) | 2010-12-07 | 2010-12-07 | Impedance test device for low voltage electric power carrier channel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004190A (en) * | 2010-12-07 | 2011-04-06 | 黑龙江省电力科学研究院 | Impedance test device of low-voltage electric power carrier channel |
| CN103199893A (en) * | 2013-04-03 | 2013-07-10 | 国家电网公司 | Low-voltage orthogonal frequency division multiplexing (OFDM) carrier physical layer communication performance detecting system |
| CN106849996A (en) * | 2015-12-04 | 2017-06-13 | 华为技术有限公司 | Meter register method and data acquisition unit based on power line communication |
| CN108008196A (en) * | 2017-11-14 | 2018-05-08 | 山东康威通信技术股份有限公司 | A kind of communication cable shielding layer distal end earth resistance metering device and method |
| CN113114531A (en) * | 2021-04-06 | 2021-07-13 | 贵州电网有限责任公司 | Laboratory carrier communication test method |
-
2010
- 2010-12-07 CN CN2010206454236U patent/CN201887763U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004190A (en) * | 2010-12-07 | 2011-04-06 | 黑龙江省电力科学研究院 | Impedance test device of low-voltage electric power carrier channel |
| CN102004190B (en) * | 2010-12-07 | 2012-11-28 | 黑龙江省电力科学研究院 | Impedance test device of low-voltage electric power carrier channel |
| CN103199893A (en) * | 2013-04-03 | 2013-07-10 | 国家电网公司 | Low-voltage orthogonal frequency division multiplexing (OFDM) carrier physical layer communication performance detecting system |
| CN103199893B (en) * | 2013-04-03 | 2014-10-15 | 国家电网公司 | Low-voltage orthogonal frequency division multiplexing (OFDM) carrier physical layer communication performance detecting system |
| CN106849996A (en) * | 2015-12-04 | 2017-06-13 | 华为技术有限公司 | Meter register method and data acquisition unit based on power line communication |
| CN106849996B (en) * | 2015-12-04 | 2021-08-20 | 华为技术有限公司 | Meter reading method and data acquisition unit based on power line communication |
| CN108008196A (en) * | 2017-11-14 | 2018-05-08 | 山东康威通信技术股份有限公司 | A kind of communication cable shielding layer distal end earth resistance metering device and method |
| CN108008196B (en) * | 2017-11-14 | 2020-07-28 | 山东康威通信技术股份有限公司 | Device and method for measuring far-end grounding resistance of shielding layer of communication cable |
| CN113114531A (en) * | 2021-04-06 | 2021-07-13 | 贵州电网有限责任公司 | Laboratory carrier communication test method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110629 Effective date of abandoning: 20130306 |
|
| RGAV | Abandon patent right to avoid regrant |