CN202471814U - Distribution line current waveform collector - Google Patents
Distribution line current waveform collector Download PDFInfo
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- CN202471814U CN202471814U CN2012200999977U CN201220099997U CN202471814U CN 202471814 U CN202471814 U CN 202471814U CN 2012200999977 U CN2012200999977 U CN 2012200999977U CN 201220099997 U CN201220099997 U CN 201220099997U CN 202471814 U CN202471814 U CN 202471814U
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- distribution line
- operational amplifier
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Abstract
The utility model discloses a distribution line current waveform collector. The distribution line current waveform collector comprises a current transformer which is used for acquiring current signals of a distribution line and processing the current signals into small current signals, a signal processing circuit which is used for processing the small current signals into alternating-current signals with direct-current components, a low-pass filter circuit which is used for detecting current information in the alternating-current signals with the direct-current components, a microprocessor and a transmission module. The distribution line current waveform collector is small in size, is convenient to mount, is suitable for acquiring line current change conditions of various 10kv distribution lines in real time, and can ensure stable and reliable working of the distribution lines.
Description
Technical field
The utility model relates to technical field of power systems, relates in particular to a kind of distribution line current waveform collector.
Background technology
Distribution line record ripple detecting device is the important power equipment of the generation of automatic record electricity systematic failures, differentiation and normal operation situation.It is not merely crash analysis scientific evidence is provided, and is in time to find the power system device defective and the important tool that accumulates first-hand technical information data.
At present, the following shortcoming of wave recording device ubiquity of existing distribution line:
(1), can only detect record ripple distribution line bus current situation of change, can't detect concrete branch line current conditions;
(2), the form of employing rack is installed on electric power system inside, installation complicacy and expensive;
(3), generally all be installed on the above distribution line of 35kv, seldom to the 10kv distribution line.
Summary of the invention
In view of above-mentioned existing in prior technology problem; The utility model provides a kind of distribution line current waveform collector, and advantages of small volume is easy for installation; Be applicable to that all kinds of 10kv distribution lines gather the line current situation of change in real time, guarantee that the distribution line working stability is reliable.
In order to reach above-mentioned technique effect, the utility model provides a kind of distribution line current waveform collector, comprising:
Be used to gather the current signal of distribution line, and said current signal is processed into the current transformer of little current signal;
Be used for said little current signal is processed into the signal processing circuit of the AC signal of band DC component;
Be used for detecting the low-pass filter circuit of current information of the AC signal of said band DC component; And
Microprocessor;
Said microprocessor comprises:
Be used for judging whether the electric current of said current information changes, then write down current electric current change information, and send the electric current judging unit of alarm signal if change;
Be used for the 3rd time clocking internal,, then write down current current information, and send the timing judging unit of alarm signal when timing time arrives in timing setting in advance;
Said distribution line current waveform collector also comprises and is used to receive said alarm signal, and the transport module of alarming;
Said current transformer, signal processing circuit, low-pass filter circuit, microprocessor and transport module are connected successively.
The distribution line current waveform collector that the utility model embodiment provides has following beneficial effect:
Through the current transformer in the distribution line current waveform collector, signal processing circuit, low-pass filter circuit, electric current judging unit, timing judging unit the current signal of distribution line is gathered and handled; And through microprocessor the information that collects is analyzed, can record out distribution line current waveform information, and point out the user through transport module; In time notify the user to analyze; Reach the Intelligent Measurement effect, gather accurately, guarantee that the distribution line working stability is reliable.And, the advantages of small volume of this distribution line current waveform collector, easy for installation, be applicable to that all kinds of 10kv distribution lines gather the line current situation of change in real time.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, will do simple the introduction to the accompanying drawing of required use in embodiment or the description of the Prior Art below.Obviously, the accompanying drawing in describing below only is some embodiment of the utility model; For those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of an embodiment of the distribution line current waveform collector that provides of the utility model;
Fig. 2 is the structural representation of an embodiment of the signal processing circuit of the distribution line current waveform collector that provides of the utility model;
Fig. 3 is the structural representation of an embodiment of the low-pass filter circuit circuit of the distribution line current waveform collector that provides of the utility model;
Fig. 4 is the structural representation of an embodiment of the low-voltage testing circuit of the distribution line current waveform collector that provides of the utility model;
Fig. 5 is the structural representation of an embodiment of the clock circuit of the distribution line current waveform collector that provides of the utility model.
Embodiment
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment will be carried out clear, complete description.Obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skills are obtained under the prerequisite of not making creative work belongs to the scope that the utility model is protected.
Referring to Fig. 1, be the structural representation of an embodiment of the distribution line current waveform collector that provides of the utility model.
The distribution line current waveform collector that present embodiment provides comprises:
Be used to gather the current signal of distribution line, and said current signal is processed into the current transformer 101 of little current signal;
Be used for said little current signal is processed into the signal processing circuit 102 of the AC signal of band DC component;
Be used for detecting the low-pass filter circuit 103 of current information of the AC signal of said band DC component;
And microprocessor 104.
Said microprocessor 104 comprises: be used for judging whether the electric current of said current information changes, then write down current electric current change information if change, and send the electric current judging unit 1041 of alarm signal; Be used for the 3rd time clocking internal,, then write down current current information, and send the timing judging unit 1042 of alarm signal when timing time arrives in timing setting in advance.
As shown in Figure 1, the distribution line current waveform collector that present embodiment provides also comprises and is used to receive said alarm signal, and the transport module of alarming 105.
During practical implementation, current transformer 101 is used to gather the current signal of distribution line, and current signal is processed into little current signal, littler current signal is sent to signal processing circuit 102.Preferably; Current transformer 101 is made up of the current transformer with high magnetic property; Because the current ratio of the distribution line that collects is bigger, causes directly gathering big current signal, so must big current signal be processed into little current signal through current transformer 101; Make output amplitude and distribution line proportional in line current, output frequency equates with the online power frequency of distribution line.
Referring to Fig. 2, be the structural representation of an embodiment of the signal processing circuit of the distribution line current waveform collector that provides of the utility model.
As shown in Figure 2, signal processing circuit 102 comprises connection terminal J1, Transient Suppression Diode D1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, capacitor C 2, operational amplifier U1A and first power supply; Specific as follows:
The input end of connection terminal J1 is connected with the output terminal of current transformer; The output terminal of connection terminal J1 is through Transient Suppression Diode D1 ground connection; The output terminal of connection terminal J1 is through resistance R 4 ground connection, and the output terminal of connection terminal J1 inserts the in-phase input end of operational amplifier U1A through capacitor C 2; One end of resistance R 1 is connected with the in-phase input end of operational amplifier U1A, and the other end of resistance R 1 is connected with first power supply, and the other end of resistance R 1 also passes through capacitor C 1 ground connection; The positive power source terminal of operational amplifier U1A is connected with first power supply; The negative power end ground connection of operational amplifier U1A; The in-phase input end of operational amplifier U1A is through resistance R 2 ground connection, and the inverting input of operational amplifier U1A is connected with the output terminal of operational amplifier U1A through resistance R 3.
Optional, as shown in Figure 2, signal processing circuit 102 also comprises capacitor C 3, the output terminal of connection terminal J1 is through capacitor C 3 ground connection.
In the middle of practical implementation; The little current signal of current transformer 101 output inserts from connection terminal J1, after capacitor C 2 couplings, inputs to operational amplifier U1A, and operational amplifier U1A is on the complete basis of holding signal; Both improved input resistance; Reduce the load of current transformer 101, reduced output resistance again, increase the driving force of circuit; Make input and output impedance phase coupling; Improve the resolution characteristic of subsequent conditioning circuit to signal, and transition suppresses diode D1 the input end of operational amplifier U1A has been played good protective action, the AC signal of band DC component after treatment is from output terminal (the being 1 pin shown in Figure 2) output of operational amplifier U1A.
Referring to Fig. 3, be the structural representation of an embodiment of the low-pass filter circuit of the distribution line current waveform collector that provides of the utility model.
Low-pass filter circuit 103 is used for detecting the current information of the AC signal of being with DC component, and is sent to microprocessor 104.As shown in Figure 3, low-pass filter 103 comprises resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, capacitor C 4, capacitor C 5, operational amplifier U2D, diode D2, diode D3 and second source; Specific as follows:
One end of resistance R 5 is connected with the output terminal of operational amplifier U1A; The other end of resistance R 5 is connected with the output terminal of operational amplifier U2D through capacitor C 5; The other end of resistance R 5 also is connected with an end of resistance R 6; The other end of resistance R 6 is connected with the in-phase input end of operational amplifier U2D, and the other end of resistance R 6 also passes through capacitor C 4 ground connection; The inverting input of operational amplifier U2D is through resistance R 7 ground connection; The inverting input of operational amplifier U2D is connected with the output terminal of operational amplifier U2D through resistance R 8; The output terminal of operational amplifier U2D is connected with an end of resistance R 9; The other end of resistance R 9 is through capacitor C 6 ground connection, and the other end of resistance R 9 also is connected with the anode of diode D2, the negative terminal of diode D3 and an end of resistance R 10 respectively, and the negative terminal of diode D2 connects second source; The positive ending grounding of diode D3, the other end of resistance R 10 is as the output terminal of low-pass filter circuit.
Optional, as shown in Figure 3, low-pass filter circuit 103 also comprises capacitor C 6, the anode of diode D2 is through capacitor C 6 ground connection.
During practical implementation; The AC signal of band DC component inputs to the active second-order low-pass filter of being made up of amplifier from resistance R 5; Filter in the distribution line because the high fdrequency component that various load produced; Only the steady-state component of low frequency is handled, obtained the current information in the distribution line, be sent to then in the microprocessor 104.
As shown in Figure 1, microprocessor 104 comprises electric current judging unit 1041 and timing judging unit 1042.Optional, microprocessor 104 adopts has 12 analog to digital converters (Analog-to-Digital Converter, ADC) microprocessor of sampling precision.
Concrete, as shown in Figure 1, electric current judging unit 1041 comprises:
The first electric current judging unit 10411; Be used for judging whether the electric current of said current information reduces; When said electric current reduces and duration during for very first time of being provided with in advance, judge said distribution line generation open fault, send alarm signal to said transport module 105; Optional, the very first time is 2 seconds;
The first electric current judging unit 10412; Be used for increasing and duration during for second time of being provided with in advance when the electric current of said current information; Judge that whether said electric current is greater than the current value that is provided with in advance; When said electric current during, said current information is sent to said transport module 105 greater than the current value that is provided with in advance; Optional, second time was 20 milliseconds, the current value that is provided with in advance is 5A.
Regularly judging unit 1042 is used for the 3rd time clocking internal in timing setting in advance, when timing time arrives, then writes down current current information, and sends alarm signal to transport module 105; Optional, the 3rd time was 1 hour, perhaps can freely set other values according to actual needs.
Concrete, when transport module 105 receives alarm signal, alarm, for the user inquiring analysis.
In addition, as shown in Figure 1, the distribution line current waveform collector that present embodiment provides also comprises:
Be used for providing the power module 106 of supply voltage to said distribution line current waveform collector;
Be used to detect the supply voltage of said distribution line current waveform collector, and testing result is sent to the low-voltage testing circuit 107 of said microprocessor 104;
Be used for providing the clock circuit 118 of accurate clock signal to said microprocessor;
Wherein, low-voltage testing circuit 107 is connected with power module 106, microprocessor 104 respectively; Clock circuit 118 is connected with microprocessor 104.
Referring to Fig. 4, be the structural representation of an embodiment of the low-voltage testing circuit of the distribution line current waveform collector that provides of the utility model.Low-voltage testing circuit 107 comprises resistance R 11, resistance R 12, low pressure detection chip U3 and the 3rd power supply; Specific as follows:
One end of resistance R 11 is connected with the 3rd power supply, and the other end of resistance R 11 is connected with the input end of low pressure detection chip U3, the common end grounding of low pressure detection chip U3, and the output terminal of low pressure detection chip U3 is connected with an end of resistance R 12; The other end of resistance R 12 is connected with microprocessor as the output terminal of low-voltage testing circuit.Present embodiment utilizes the level function of microprocessor 104, utilizes low pressure detection chip U3 to detect low voltage level, and inputs to the level detection pin of microprocessor 104, and microprocessor 104 changes according to level judges whether low pressure of current power supply.
During practical implementation, above-mentioned first power supply, second source and the 3rd power supply can be provided by power module 106.
Referring to Fig. 5, be the structural representation of an embodiment of the clock circuit of the distribution line current waveform collector that provides of the utility model.
One end of capacitor C 7 is connected with the input end of clock circuit, the other end ground connection of capacitor C 7; The end of crystal oscillator Y1 is connected with the input end of clock circuit, and the other end of crystal oscillator Y1 is through capacitor C 8 ground connection, and the other end of crystal oscillator Y1 is also as the output terminal of clock circuit.
In sum; The distribution line current waveform collector that the utility model provides is gathered and is handled the current signal of distribution line, and through microprocessor the information that collects is analyzed through the current transformer in the distribution line current waveform collector, electric current judging unit, timing judging unit; Can record out distribution line current waveform information; And point out the user through transport module, and in time notify the user to analyze, reach the Intelligent Measurement effect; Gather accurately, guarantee that the distribution line working stability is reliable.And, the advantages of small volume of this distribution line current waveform collector, easy for installation, be applicable to that all kinds of 10kv distribution lines gather the line current situation of change in real time.
Above disclose be merely several kinds of preferred embodiments of the utility model, can not limit the interest field of the utility model certainly with this.Therefore, the equivalent variations according to the utility model claim is done still belongs to the scope that the utility model is contained.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from the technical scope and the distribution line current waveform collector structure of the utility model.Like this, belong within the utility model claim and equivalent technologies scope and the distribution line current waveform collector structure if these of the utility model are revised with modification, then the utility model also is intended to comprise these changes and modification interior.
Claims (7)
1. a distribution line current waveform collector is characterized in that, comprising:
Be used to gather the current signal of distribution line, and said current signal is processed into the current transformer of little current signal;
Be used for said little current signal is processed into the signal processing circuit of the AC signal of band DC component;
Be used for detecting the low-pass filter circuit of current information of the AC signal of said band DC component; And
Microprocessor;
Said microprocessor comprises:
Be used for judging whether the electric current of said current information changes, then write down current electric current change information, and send the electric current judging unit of alarm signal if change;
Be used for the 3rd time clocking internal,, then write down current current information, and send the timing judging unit of alarm signal when timing time arrives in timing setting in advance;
Said distribution line current waveform collector also comprises and is used to receive said alarm signal, and the transport module of alarming;
Said current transformer, signal processing circuit, low-pass filter circuit, microprocessor and transport module are connected successively.
2. distribution line current waveform collector as claimed in claim 1 is characterized in that, said electric current judging unit comprises:
Be used for judging whether the electric current of said current information reduces,, judge said distribution line generation open fault, send the first electric current judging unit of alarm signal to said transport module when said electric current reduces and duration during for very first time of being provided with in advance;
Be used for increasing and duration during for second time of being provided with in advance when the electric current of said current information; Judge that whether said electric current is greater than the current value that is provided with in advance; When said electric current during, said current information is sent to the second electric current judging unit of said transport module greater than the current value that is provided with in advance.
3. distribution line current waveform collector as claimed in claim 2 is characterized in that, said distribution line current waveform collector also comprises:
Be used for providing the power module of supply voltage to said distribution line current waveform collector;
Be used to detect the supply voltage of said distribution line current waveform collector, and testing result is sent to the low-voltage testing circuit of said microprocessor;
Be used for providing the clock circuit of accurate clock signal to said microprocessor;
Said low-voltage testing circuit is connected with said power module, said microprocessor respectively; Said clock circuit is connected with said microprocessor.
4. like each described distribution line current waveform collector of claim 1 to 3; It is characterized in that said signal processing circuit comprises connection terminal J1, Transient Suppression Diode D1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, capacitor C 2, operational amplifier U1A and first power supply;
The input end of said connection terminal J1 is connected with the output terminal of said current transformer; The output terminal of said connection terminal J1 is through said Transient Suppression Diode D1 ground connection; The output terminal of said connection terminal J1 is through said resistance R 4 ground connection, and the output terminal of said connection terminal J1 inserts the in-phase input end of said operational amplifier U1A through said capacitor C 2;
One end of said resistance R 1 is connected with the in-phase input end of said operational amplifier U1A, and the other end of said resistance R 1 is connected with said first power supply, and the other end of said resistance R 1 also passes through said capacitor C 1 ground connection;
The positive power source terminal of said operational amplifier U1A is connected with said first power supply; The negative power end ground connection of said operational amplifier U1A; The in-phase input end of said operational amplifier U1A is through said resistance R 2 ground connection, and the inverting input of said operational amplifier U1A is connected with the output terminal of said operational amplifier U1A through said resistance R 3.
5. distribution line current waveform collector as claimed in claim 4; It is characterized in that said low-pass filter circuit comprises resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, capacitor C 4, capacitor C 5, operational amplifier U2D, diode D2, diode D3 and second source;
One end of said resistance R 5 is connected with the output terminal of said operational amplifier U1A; The other end of said resistance R 5 is connected with the output terminal of said operational amplifier U2D through said capacitor C 5; The other end of said resistance R 5 also is connected with an end of said resistance R 6; The other end of said resistance R 6 is connected with the in-phase input end of said operational amplifier U2D, and the other end of said resistance R 6 also passes through said capacitor C 4 ground connection; The inverting input of said operational amplifier U2D is through said resistance R 7 ground connection; The inverting input of said operational amplifier U2D is connected with the output terminal of said operational amplifier U2D through said resistance R 8; The output terminal of said operational amplifier U2D is connected with an end of said resistance R 9; The other end of said resistance R 9 is through said capacitor C 6 ground connection, and the other end of said resistance R 9 also is connected with the negative terminal of the anode of said diode D2, said diode D3 and an end of said resistance R 10 respectively, and the negative terminal of said diode D2 connects said second source; The positive ending grounding of said diode D3, the other end of said resistance R 10 is as the output terminal of low-pass filter circuit.
6. like each described distribution line current waveform collector of claim 1 ~ 3, it is characterized in that said low-voltage testing circuit comprises resistance R 11, resistance R 12, low pressure detection chip U3 and the 3rd power supply;
One end of said resistance R 11 is connected with said the 3rd power supply; The other end of said resistance R 11 is connected with the input end of said low pressure detection chip U3; The common end grounding of said low pressure detection chip U3, the output terminal of said low pressure detection chip U3 is connected with an end of said resistance R 12; The other end of said resistance R 12 is connected with said microprocessor as the output terminal of said low-voltage testing circuit.
7. like each described distribution line current waveform collector of claim 1 ~ 3, it is characterized in that said clock circuit comprises capacitor C 7, capacitor C 8 and crystal oscillator Y1;
One end of said capacitor C 7 is connected with the input end of said clock circuit, the other end ground connection of said capacitor C 7; The end of said crystal oscillator Y1 is connected with the input end of said clock circuit, and the other end of said crystal oscillator Y1 is through said capacitor C 8 ground connection, and the other end of said crystal oscillator Y1 is also as the output terminal of said clock circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200999977U CN202471814U (en) | 2012-03-16 | 2012-03-16 | Distribution line current waveform collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200999977U CN202471814U (en) | 2012-03-16 | 2012-03-16 | Distribution line current waveform collector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202471814U true CN202471814U (en) | 2012-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200999977U Expired - Lifetime CN202471814U (en) | 2012-03-16 | 2012-03-16 | Distribution line current waveform collector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202471814U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109000716A (en) * | 2018-06-06 | 2018-12-14 | 清华大学 | One kind being based on the faradic transmission line galloping monitoring method of OPGW ground wire |
-
2012
- 2012-03-16 CN CN2012200999977U patent/CN202471814U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109000716A (en) * | 2018-06-06 | 2018-12-14 | 清华大学 | One kind being based on the faradic transmission line galloping monitoring method of OPGW ground wire |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121003 |
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| CX01 | Expiry of patent term |