CN203164283U - Voltage quality monitoring analyzer with overcurrent protective device - Google Patents
Voltage quality monitoring analyzer with overcurrent protective device Download PDFInfo
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- CN203164283U CN203164283U CN 201320043799 CN201320043799U CN203164283U CN 203164283 U CN203164283 U CN 203164283U CN 201320043799 CN201320043799 CN 201320043799 CN 201320043799 U CN201320043799 U CN 201320043799U CN 203164283 U CN203164283 U CN 203164283U
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- quality monitoring
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Abstract
The utility model discloses a voltage quality monitoring analyzer with an overcurrent protective device. The voltage quality monitoring analyzer comprises a current-transformer circuit module, a reference-voltage circuit module, an operational circuit module, a two-stage RC filtering module, an emitter follower circuit module, the overcurrent protective device and a microprocessor MCU, wherein the microprocessor MCU is provided with an A/D conversion unit; the current-transformer circuit module, the operational circuit module, the two-stage RC filtering module, the emitter follower circuit module and the A/D conversion unit are successively connected in series; and the reference-voltage circuit module and the current-transformer circuit module are connected in parallel. Under a premise without an individual AD converter chip, the analyzer provided by the utility model can still measure voltage and voltage distortion rate accurately and analyze voltage quality. An internal circuit structure is simultaneously simplified and cost is reduced.
Description
Technical field
The utility model relates to electricity analysis instrument field, relates in particular to a kind of voltage quality monitoring analyser with overcurrent protection.
Background technology
The voltage quality monitoring analyser, it is the instrument of a kind of measuring voltage and voltage distortion rate, analytical voltage quality, can carry out conversion process to the voltage signal that reads in, under the synchro control of clock, automatically monitoring, the every statistical value of statistics and analysis and storage, selecting to read for the user, can gather the multiple voltage signal simultaneously, demonstration, statistic of classification, is one of indispensable instrument of power system monitoring, examination grid voltage quality.But existing voltage quality monitoring analyser is by after the independent analog to digital converter chip sampling when measuring voltage, finishes dealing with through CPU again.Described voltage quality monitoring analyser adopts the analog to digital converter chip to the cost height of measuring-signal sampling, and peripheral circuit is huge and complicated simultaneously.
The utility model content
The purpose of the utility model embodiment is: a kind of voltage quality monitoring analyser with overcurrent protection is provided; under the prerequisite that does not adopt independent analog to digital converter chip; still measuring voltage and voltage distortion rate accurately; the analytical voltage quality; inner simultaneously circuit structure is simplified, and cost has obtained reduction.
A kind of voltage quality monitoring analyser with overcurrent protection that the utility model embodiment provides comprises current transformer circuit module, reference voltage circuit module, discharge circuit module, two-stage RC filtration module, emitter follower circuit module, overcurrent protection and microprocessor MCU; Described microprocessor MCU is provided with the A/D AD conversion unit; Described current transformer circuit module, discharge circuit module, two-stage RC filtration module, emitter follower circuit module and A/D AD conversion unit are connected successively; Described reference voltage circuit module and described current transformer circuit module are in parallel; Described overcurrent protection comprises current transformer, sampled rectifier circuit and signal processing circuit, and described sampled rectifier circuit comprises the shunt of at least four group rectification circuits and at least three current transformers; Two commutation diodes of every group of rectification circuit branch route are in series; One of them output terminal of the secondary side of three current transformers inserts respectively between one group of rectification circuit, two commutation diodes along separate routes; Another output terminal is respectively through behind the sample resistance, and is in parallel with an end of a ground connection sample resistance; The other end of ground connection sample resistance is connected between a remaining rectification circuit two commutation diodes along separate routes, and described signal processing circuit is inserted at the two ends of while three sample resistances and ground connection sample resistance respectively.
Optionally, the input end in described current transformer circuit module is connected with thermistor and voltage dependent resistor (VDR).
Optionally, the model of the current transformer in the described current transformer circuit module is SPT205.
Optionally, the model of the operational amplifier in the described discharge circuit module is LM258.
Optionally, the model of the amplifier in the described emitter follower circuit module is LM258.
Optionally, the model of described microprocessor MCU is LPC2136.
Optionally, also be provided with communication module; Described communication module links to each other with described microprocessor MCU electricity.
Optionally, described communication module comprises GPRS wireless communication unit and RS485 communication unit.
Optionally, also be provided with LCD digital display module; Described LCD digital display module links to each other with described microprocessor MCU electricity.
Therefore, use the technical scheme of the utility model embodiment, have jurisdiction over parallel operation chip and complicated peripheral circuit by the modulus that the microprocessor MCU that has the A/D AD conversion unit has replaced in the existing voltage quality monitoring analyser, not only measuring voltage and voltage distortion rate accurately, cost has obtained reduction simultaneously, and circuit also is simplified.At first by the current transformer circuit module ac high-voltage signal standard of measuring is become current signal, and then at the output terminal of described current transformer circuit module two resistance in parallel, described current signal is become voltage signal again.Simultaneously, reference voltage circuit module in parallel realizes the level lifting on described current transformer circuit module, guarantees that the voltage-phase of described current transformer circuit module output is the forward position.Connect LM258 discharge circuit module at described voltage signal, undertaken amplifying with phase ratio by two circuit simultaneously, and then access two-stage RC filtration module and LM258 emitter follower circuit, thereby reduce resistance, also just reduced the distortion of signal, the last A/D AD conversion unit that is linked into described microprocessor MCU again, convert the analog voltage signal of input to digital voltage signal, finally realized the real-time collection of voltage signal, be simultaneously microprocessor MCU according to the waveform of the real-time collection of voltage, calculate the voltage distortion rate by Fourier transform.Simultaneously, described LCD digital display module can all show voltage signal and voltage distortion rate, also carries out remote transmission to the control and management center by described GPRS radio communication or RS485 communication mode, realizes remote wireless monitoring.
Description of drawings
Fig. 1 is structured flowchart of the present utility model.
Embodiment
In order further to understand feature of the present utility model and technology contents, see also following about detailed description of the present utility model and accompanying drawing, describe most preferred embodiment of the present utility model in detail below in conjunction with accompanying drawing, the utility model is limited.
As shown in Figure 1, the voltage quality monitoring analyser of the band overcurrent protection shown in the utility model, comprise current transformer circuit module 1, reference voltage circuit module 2, discharge circuit module 3, two-stage RC filtration module 4, emitter follower circuit module 5, overcurrent protection 11 and microprocessor MUC6, described microprocessor MCU 6 is provided with A/D AD conversion unit 61, and described current transformer circuit module 1, discharge circuit module 3, two-stage RC filtration module 4, emitter follower circuit module 5 and A/D AD conversion unit 61 are connected successively; Described reference voltage circuit module 2 is in parallel with described current transformer circuit module l; Described overcurrent protection 11 comprises current transformer, sampled rectifier circuit and signal processing circuit, and described sampled rectifier circuit comprises the shunt of at least four group rectification circuits and at least three current transformers; Two commutation diodes of every group of rectification circuit branch route are in series; One of them output terminal of the secondary side of three current transformers inserts respectively between one group of rectification circuit, two commutation diodes along separate routes; Another output terminal is respectively through behind the sample resistance, and is in parallel with an end of a ground connection sample resistance; The other end of ground connection sample resistance is connected between a remaining rectification circuit two commutation diodes along separate routes, and described signal processing circuit is inserted at the two ends of while three sample resistances and ground connection sample resistance respectively.The interchange analog signal conversion that described current transformer circuit module 1 will be imported becomes the current signal of microampere order; Described reference voltage circuit module 2 is the phase problems in view of alternating current, when realizing the level lifting, guarantees that also the voltage-phase of output is positive phase; 3 voltage signals with input of described discharge circuit module amplify on year-on-year basis; 4 interference that will filter out in the system of described two-stage filtration module improve the precision of gathering; Described emitter follower circuit module 5 is from base input signal, from the emitter-base bandgap grading output signal, makes the high impedance of input become low-impedance output, and Shu Chu signal is consistent with the signal phase of input simultaneously; The analog voltage signal of 61 inputs of described A/D AD conversion unit converts digital voltage signal to, realizes the real-time collection to voltage signal, and passes elm and handle to described microprocessor MCU6.
Wherein, the model of the current transformer in the described current transformer circuit module 1 is SPT205; The model of the amplifier in the described discharge circuit module is LM258, plays amplification; The model of the amplifier in the described emitter follower circuit module is LM258, plays the emitter following effect; The model of described microprocessor MCU is LPC2136, and it also is connected with communication module, LCD digital display module 7 and power module 8 by pin; Wherein, described communication module comprises GPRS wireless communication unit 9 and RS485 communication unit 10.In addition, be connected with thermistor and voltage dependent resistor (VDR) at the input end of described current transformer circuit module 1, mainly circuit played a protective role.
The above embodiment only is used for illustrating the utility model, but is not limited thereto.Under the condition that does not depart from the utility model design, affiliated technical field personnel can make suitable change adjustment, and these change adjustment also should be included within the claim protection domain of the present utility model.
Claims (5)
1. the voltage quality monitoring analyser with overcurrent protection is characterized in that: comprise current transformer circuit module, reference voltage circuit module, discharge circuit module, two-stage RC filtration module, emitter follower circuit module, overcurrent protection and microprocessor MCU; Described microprocessor MCU is provided with the A/D AD conversion unit; Described current transformer circuit module, discharge circuit module, two-stage RC filtration module, emitter follower circuit module and A/D AD conversion unit are connected successively; Described reference voltage circuit module and described current transformer circuit module are in parallel; Described overcurrent protection comprises current transformer, sampled rectifier circuit and signal processing circuit, and described sampled rectifier circuit comprises the shunt of at least four group rectification circuits and at least three current transformers; Two commutation diodes of every group of rectification circuit branch route are in series; One of them output terminal of the secondary side of three current transformers inserts respectively between one group of rectification circuit, two commutation diodes along separate routes; Another output terminal is respectively through behind the sample resistance, and is in parallel with an end of a ground connection sample resistance; The other end of ground connection sample resistance is connected between a remaining rectification circuit two commutation diodes along separate routes, and described signal processing circuit is inserted at the two ends of while three sample resistances and ground connection sample resistance respectively.
2. the voltage quality monitoring analyser of band overcurrent protection according to claim 1, it is characterized in that: the input end in described current transformer circuit module is connected with thermistor and voltage dependent resistor (VDR).
3. the voltage quality monitoring analyser of band overcurrent protection according to claim 1 is characterized in that: also be provided with communication module; Described communication module links to each other with described microprocessor MCU electricity.
4. the voltage quality monitoring analyser of band overcurrent protection according to claim 3, it is characterized in that: described communication module comprises GPRS wireless communication unit and RS485 communication unit.
5. the voltage quality monitoring analyser of band overcurrent protection according to claim 1 is characterized in that: also be provided with LCD digital display module; Described LCD digital display module links to each other with described microprocessor MCU electricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320043799 CN203164283U (en) | 2013-01-28 | 2013-01-28 | Voltage quality monitoring analyzer with overcurrent protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320043799 CN203164283U (en) | 2013-01-28 | 2013-01-28 | Voltage quality monitoring analyzer with overcurrent protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203164283U true CN203164283U (en) | 2013-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320043799 Expired - Fee Related CN203164283U (en) | 2013-01-28 | 2013-01-28 | Voltage quality monitoring analyzer with overcurrent protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203164283U (en) |
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2013
- 2013-01-28 CN CN 201320043799 patent/CN203164283U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130828 Termination date: 20140128 |