CN203216993U - Power-grid harmonic real-time online monitor - Google Patents
Power-grid harmonic real-time online monitor Download PDFInfo
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- CN203216993U CN203216993U CN 201320142356 CN201320142356U CN203216993U CN 203216993 U CN203216993 U CN 203216993U CN 201320142356 CN201320142356 CN 201320142356 CN 201320142356 U CN201320142356 U CN 201320142356U CN 203216993 U CN203216993 U CN 203216993U
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Abstract
The utility model relates to an online monitor, and especially relates to a power-grid harmonic real-time online monitor. The power-grid harmonic real-time online monitor comprises a voltage transformer, a current transformer, a signal conditioner, an analog-digital converter, a DSP chip, a frequency measurer, a clock-signal generator and a selector switch. The power-grid harmonic real-time online monitor selects a three-phase AC voltage or a three-phase AC current via the selector switch to obtain acquisition clock signals of the analog-digital converter, thereby preventing a defect that clock signals cannot be acquired when a failure happens to a detection loop; and an alarm is sent when values of harmonic parameters are beyond allowed parameter value scopes for monitoring safe operation of a power grid, and safety of monitoring the operation of the power grid is improved.
Description
Technical field
The utility model relates to the on-line monitoring instrument, especially mains by harmonics real time on-line monitoring instrument.
Background technology
The harmonic wave monitor is of long duration in the application of electric system, but the monitor of energy real time on-line monitoring harmonic wave is more few.Along with the raising that the quality of power supply is required, the intellectuality of electrical network, greenization are the contents that work about electric power person need study and solve, power system harmonic measurement is one of important content of electric power quality monitoring, and the monitoring harmonic information of real-time online can find effectively that power system state also is the foundation of effectively carrying out harmonic wave control.IEC61000-4-7 standard and most harmonic measuring instrument still prolong with adding Hanning window FFT method the measurement of harmonic wave.The whole subharmonic of FFT method measurement electrical network is more more accurately under the less situation of synchronous error, if but exist big synchronous error just not too rationally not too accurate with traditional windowing FFT method measurement mains by harmonics.
The utility model content
Technical problem to be solved in the utility model is the deficiency at the above-mentioned background technology, and mains by harmonics real time on-line monitoring instrument is provided.
The utility model adopts following technical scheme for solving the problems of the technologies described above:
Mains by harmonics real time on-line monitoring instrument comprises voltage transformer (VT), current transformer, signal conditioner, analog to digital converter, dsp chip, frequency measuring set, clock-signal generator, selector switch, wherein,
Described voltage transformer (VT) connects and composes the voltage detecting loop with monitoring electrical network inlet wire;
Described current transformer connects and composes current detection circuit with monitoring electrical network inlet wire;
Described signal conditioner first input end is connected with described voltage detecting loop output terminal, and signal conditioner second input end is connected with described current detection circuit output terminal;
Described frequency measuring set input end is connected with described voltage detecting loop output terminal or current detection circuit output terminal by selector switch, and the frequency measuring set output terminal is connected with dsp chip;
Described clock-signal generator input end is connected with described voltage detecting loop output terminal or current detection circuit output terminal by selector switch;
Described analog to digital converter first input end connects described signal conditioner output terminal, the described clock generating circuit output terminal of the analog to digital converter second input termination, analog to digital converter output termination dsp chip.
Further, described mains by harmonics real time on-line monitoring instrument also comprises alarm, LED, and described alarm, LED are connected with dsp chip respectively.
Further, in the described mains by harmonics real time on-line monitoring instrument, frequency measuring set comprises: preposition low-pass filter, comparer, single-chip microcomputer, wherein, described preposition low-pass filter input end is connected with described voltage detecting loop output terminal or current detection circuit output terminal by selector switch, described comparator input terminal connects described preposition low-pass filter output terminal, the described comparator output terminal of described single-chip microcomputer input termination, the monitoring mains frequency that single-chip microcomputer output calculates.
The utility model adopts technique scheme, has following beneficial effect: select three-phase alternating voltage or three-phase alternating current to obtain the collection clock signal of analog to digital converter by selector switch, avoided when detecting loop fault, can't gathering the defective of clock signal; When harmonic parameters exceeds the parameter value scope of monitoring electric power netting safe running permission, give the alarm, improved the security of monitoring operation of power networks.
Description of drawings
Fig. 1 is the synoptic diagram of mains by harmonics real time on-line monitoring instrument.
Fig. 2 is the synoptic diagram of mains by harmonics real time on-line monitoring instrument medium frequency measuring appliance.
Embodiment
Below in conjunction with accompanying drawing the technical solution of the utility model is elaborated:
Mains by harmonics real time on-line monitoring instrument comprises voltage transformer (VT), current transformer, signal conditioner, analog to digital converter, dsp chip, frequency measuring set, clock-signal generator, selector switch as shown in Figure 1.Voltage transformer (VT) connects and composes the voltage detecting loop with monitoring electrical network inlet wire.Current transformer connects and composes current detection circuit with monitoring electrical network inlet wire.The signal conditioner first input end is connected with voltage detecting loop output terminal, and signal conditioner second input end is connected with the current detection circuit output terminal.The frequency measuring set input end is connected with voltage detecting loop output terminal or current detection circuit output terminal by selector switch, and the frequency measuring set output terminal is connected with dsp chip.The clock-signal generator input end is connected with voltage detecting loop output terminal or current detection circuit output terminal by selector switch.The analog to digital converter first input end connects the signal conditioner output terminal, the analog to digital converter second input termination clock generating circuit output terminal, analog to digital converter output termination dsp chip.Alarm, LED are connected with dsp chip respectively.Dsp chip is communicated by letter with host computer by communication chip.
Frequency measuring set comprises preposition low-pass filter, comparer, single-chip microcomputer as shown in Figure 2.Preposition low-pass filter input end is connected with described voltage detecting loop output terminal or current detection circuit output terminal by selector switch, comparator input terminal connects described preposition low-pass filter output terminal, the described comparator output terminal of single-chip microcomputer input termination, the monitoring mains frequency that single-chip microcomputer output calculates.Harmonic components in preposition low-pass filter elimination ac voltage signal or the ac current signal, voltage signal or the current signal of comparer after with the filtering harmonic components is converted to square wave, single-chip microcomputer utilizes interruption of work mode computation comparer output two continuous rising edge interludes of square wave or two continuous negative edge interludes, obtain voltage signal cycle or current signal cycle, and then obtain frequency.
Voltage transformer (VT) detects the three-phase voltage signal of monitoring electrical network inlet wire, and current transformer detects the three-phase current signal of monitoring electrical network inlet wire.Signal conditioner is done three-phase voltage signal, three-phase current signal and is transferred to analog to digital converter after the peak is handled.All the time signal generator is input quantity by selector switch with three-phase voltage signal or three-phase current signal, obtains gathering clock signal.Analog to digital converter is done analog to digital conversion according to the collection clock signal of clock-signal generator output to the three-phase voltage signal, the three-phase current signal that go to the peak to handle.Frequency measuring set is input quantity by selector switch with three-phase voltage signal or three-phase current signal, obtains monitoring the frequency of electrical network inlet wire alternating current.The ac frequency that dsp chip records analog to digital converter output quantity, frequency measuring set is done data and is handled, and obtains harmonic parameters; Harmonic parameters transfers to host computer through communication chip; When the harmonic parameters that obtains when processing exceeded the parameter value scope that operation of power networks allows, warning horn gave the alarm, the LED flicker.
In sum, the mains by harmonics real time on-line monitoring instrument that the utility model relates to selects three-phase alternating voltage or three-phase alternating current to obtain the collection clock signal of analog to digital converter by selector switch, has avoided can't gathering when detecting loop fault the defective of clock signal; When harmonic parameters exceeds the parameter value scope of monitoring electric power netting safe running permission, give the alarm, improved the security of monitoring operation of power networks.
Claims (3)
1. mains by harmonics real time on-line monitoring instrument is characterized in that, comprises voltage transformer (VT), current transformer, signal conditioner, analog to digital converter, dsp chip, frequency measuring set, clock-signal generator, selector switch, wherein,
Described voltage transformer (VT) connects and composes the voltage detecting loop with monitoring electrical network inlet wire;
Described current transformer connects and composes current detection circuit with monitoring electrical network inlet wire;
Described signal conditioner first input end is connected with described voltage detecting loop output terminal, and signal conditioner second input end is connected with described current detection circuit output terminal;
Described frequency measuring set input end is connected with described voltage detecting loop output terminal or current detection circuit output terminal by selector switch, and the frequency measuring set output terminal is connected with dsp chip;
Described clock-signal generator input end is connected with described voltage detecting loop output terminal or current detection circuit output terminal by selector switch;
Described analog to digital converter first input end connects described signal conditioner output terminal, the described clock generating circuit output terminal of the analog to digital converter second input termination, analog to digital converter output termination dsp chip.
2. mains by harmonics real time on-line monitoring instrument according to claim 1 is characterized in that, described mains by harmonics real time on-line monitoring instrument also comprises alarm, LED, and described alarm, LED are connected with dsp chip respectively.
3. mains by harmonics real time on-line monitoring instrument according to claim 1 and 2, it is characterized in that, described frequency measuring set comprises: preposition low-pass filter, comparer, single-chip microcomputer, wherein, described preposition low-pass filter input end is connected with described voltage detecting loop output terminal or current detection circuit output terminal by selector switch, described comparator input terminal connects described preposition low-pass filter output terminal, the described comparator output terminal of described single-chip microcomputer input termination, the monitoring mains frequency that single-chip microcomputer output calculates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320142356 CN203216993U (en) | 2013-03-27 | 2013-03-27 | Power-grid harmonic real-time online monitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320142356 CN203216993U (en) | 2013-03-27 | 2013-03-27 | Power-grid harmonic real-time online monitor |
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| CN203216993U true CN203216993U (en) | 2013-09-25 |
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| CN 201320142356 Expired - Fee Related CN203216993U (en) | 2013-03-27 | 2013-03-27 | Power-grid harmonic real-time online monitor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267259A (en) * | 2014-09-30 | 2015-01-07 | 广东电网有限责任公司电力科学研究院 | Power harmonic measurement method and system |
| CN104502706B (en) * | 2014-12-29 | 2017-05-03 | 广东电网有限责任公司电力科学研究院 | Harmonic amplitude measurement method and system of power signal |
| CN107390027A (en) * | 2017-07-27 | 2017-11-24 | 许文远 | A kind of electric harmonic detector |
| CN112506114A (en) * | 2020-12-29 | 2021-03-16 | 河南辉煌科技股份有限公司 | Railway signal external power network monitoring device based on DSP chip |
-
2013
- 2013-03-27 CN CN 201320142356 patent/CN203216993U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267259A (en) * | 2014-09-30 | 2015-01-07 | 广东电网有限责任公司电力科学研究院 | Power harmonic measurement method and system |
| CN104267259B (en) * | 2014-09-30 | 2017-01-18 | 广东电网有限责任公司电力科学研究院 | Power harmonic measurement method and system |
| CN104502706B (en) * | 2014-12-29 | 2017-05-03 | 广东电网有限责任公司电力科学研究院 | Harmonic amplitude measurement method and system of power signal |
| CN107390027A (en) * | 2017-07-27 | 2017-11-24 | 许文远 | A kind of electric harmonic detector |
| CN112506114A (en) * | 2020-12-29 | 2021-03-16 | 河南辉煌科技股份有限公司 | Railway signal external power network monitoring device based on DSP chip |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130925 Termination date: 20150327 |
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| EXPY | Termination of patent right or utility model |