CN211453790U - Non-contact electric field measurement system for fault indicator - Google Patents
Non-contact electric field measurement system for fault indicator Download PDFInfo
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- CN211453790U CN211453790U CN201922117730.0U CN201922117730U CN211453790U CN 211453790 U CN211453790 U CN 211453790U CN 201922117730 U CN201922117730 U CN 201922117730U CN 211453790 U CN211453790 U CN 211453790U
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Abstract
The utility model provides a non-contact electric field measurement system for fault indicator, the embodiment of the utility model provides a through installation set up electric field induction piece, signal conditioning unit and MCU chip on electrified line, the voltage signal who will respond to out through electric field induction piece inputs signal conditioning unit, output signal that unit output is used for the MCU chip to handle is conditioned to the through signal, thereby realize the condition that can make fault indicator adapt to the different wires of overhead line, effectively judge the circuit trouble, this circuit adopts the non-contact mode simultaneously, can satisfy electrified loading and unloading demand, guarantee the even running of distribution network.
Description
Technical Field
The utility model relates to a supply and distribution fault detection technical field, especially a non-contact electric field measurement system for fault indicator.
Background
Under the normal operation condition of the overhead line low-current system, under the action of the same voltage, the phase electric field strength of three phases is the same, and the three phases keep symmetry. When single-phase earth fault occurs, the strength of the phase electric field changes along with the change of the phase voltage, and the earth characteristic can be reflected through the change of the strength of the phase electric field.
At present, a transient recording type fault indicator is widely applied to an overhead line small current system, a collecting unit of the fault indicator monitors current and a ground electric field of a corresponding phase line, short-circuit faults are indicated on site, recording is triggered when abnormal change of the line current or the line electric field is detected, current and electric field waveforms before and after the abnormal change moment are recorded, and the current and the electric field waveforms are transmitted to a collecting unit through short-distance wireless communication. Through the wave recording function of the fault indicator, the panoramic recording of the fault occurrence and evolution process can be realized, basic data is provided for accurately analyzing the fault reason of the power distribution network, and the current situation that the fault reason can only be presumed by depending on experience is changed.
However, the existing overhead line is made of both insulated conductors and bare conductors, the difference between the ground electric fields of the two conductors is large, and the existing fault indicator does not distinguish the two conductors, so that the electric field sampling accuracy is low, the situations of false alarm, failure in alarm and the like exist, and the fault of the power distribution network cannot be timely and accurately judged. In addition, because the power distribution network has numerous branches and has large power failure influence, the sampling precision of current and electric field is difficult to ensure even if the acquisition unit arranged on the line adopts a live-line loading and unloading mode.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a non-contact electric field measurement system for fault indicator aims at solving the problem that can't the accuracy carry out the judgement to the distribution network trouble among the prior art, realizes the condition that adapts to the different wires of overhead line, effectively judges the line trouble, guarantees the distribution network even running.
In order to achieve the above technical purpose, the utility model provides a non-contact electric field measurement system for fault indicator, the system articulates on the circuit, and it includes:
the electric field induction chip, the filter, the primary operational amplification circuit, the secondary operational amplification circuit and the MCU chip are connected in sequence;
the electric field induction sheet induces a voltage signal and inputs the voltage signal into the filter, the filter filters the voltage signal, the signal amplification is carried out through the primary operational amplifier circuit and the secondary operational amplifier circuit, the amplified signal is output to the MCU chip, and the MCU chip judges whether the electric field of the circuit is abnormally changed or not according to the amplified voltage signal.
Preferably, the output end of the filter is connected with a voltage dividing resistor R1, the other end of the voltage dividing resistor R1 is connected with the inverting input end of the primary operational amplifier, the inverting input end is further connected with a feedback resistor R2, the non-inverting input end of the primary operational amplifier is connected with a dc bias voltage VREF, the output end is respectively connected with a resistor R2, an MCU chip and a voltage dividing resistor R3, the inverting input end of the secondary operational amplifier is respectively connected with a voltage dividing resistor R3 and a feedback resistor R4, the non-inverting input end of the secondary operational amplifier is connected with a dc bias voltage VREF, and the output end is respectively connected with a resistor R.
Preferably, the electric field induction sheet is a single-layer brass sheet.
Preferably, the thickness of the electric field induction sheet is 1-1.5mm, the electric field induction sheet is rectangular, a lead bonding pad is arranged on the edge of the electric field induction sheet, and the electric field induction sheet is connected with the filter through a lead.
The effects provided in the contents of the present invention are only the effects of the embodiments, not all the effects of the present invention, and one of the above technical solutions has the following advantages or advantageous effects:
compared with the prior art, the embodiment of the utility model provides a through the installation set up electric field induction piece on the live wire way, signal conditioning unit and MCU chip, the voltage signal who will respond to through electric field induction piece inputs signal conditioning unit, output through signal conditioning unit is used for the output signal that the MCU chip handled, thereby the realization can make fault indicator adapt to the condition of the different wires of overhead line, effectively judge the circuit trouble, this circuit adopts the non-contact mode simultaneously, can satisfy electrified loading and unloading demand, guarantee the distribution network even running. The utility model has simple design and simple structure, the measuring part and the conductor adopt non-contact connection, thus the insulating property of the collecting unit is obviously improved, the requirements of live loading and unloading can be met, and large-area power failure maintenance is avoided; the electric field induction sheet of the utility model is made of brass sheet, the collected electric field signal is accurate, the sampling precision problem of non-contact measurement is solved, the wave recording can be rapidly and accurately triggered when the line electric field is abnormally changed, the panoramic recording of the fault occurrence and evolution process is realized, and the basic data is provided for accurately analyzing the fault reason of the distribution network; the utility model discloses both having been applicable to overhead line insulated wire, also being applicable to overhead line bare conductor, electric field sampling rate of accuracy is higher, can in time accurately judge and report the distribution network trouble.
Drawings
Fig. 1 is a structural diagram of a non-contact electric field measurement system for a fault indicator according to the present invention.
Detailed Description
In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily limit the invention.
The following describes a non-contact electric field measurement system for a fault indicator according to an embodiment of the present invention in detail with reference to the accompanying drawings.
As shown in fig. 1, the utility model discloses a non-contact electric field measurement system for fault indicator, the system articulates on the circuit, and it includes:
the electric field induction chip, the filter, the primary operational amplification circuit, the secondary operational amplification circuit and the MCU chip are connected in sequence;
the electric field induction sheet induces a voltage signal and inputs the voltage signal into the filter, the filter filters the voltage signal, the signal amplification is carried out through the primary operational amplifier circuit and the secondary operational amplifier circuit, the amplified signal is output to the MCU chip, and the MCU chip judges whether the electric field of the circuit is abnormally changed or not according to the amplified voltage signal.
The electric field induction sheet is a single-layer brass sheet, the shape and the size of the electric field induction sheet are matched with those of the acquisition unit, and the thickness of the electric field induction sheet is 1-1.5 mm. The electric field induction sheet is rectangular, and the edge is provided with a lead bonding pad which is connected with the filter through a lead.
The electric field sensing chip inputs a sensed voltage signal into the filter, the output end of the filter is connected with a divider resistor R1, the other end of the divider resistor R1 is connected with the inverting input end of the primary operational amplifier, the inverting input end is further connected with a feedback resistor R2, the non-inverting input end of the primary operational amplifier is connected with a direct current bias voltage VREF, the output end of the primary operational amplifier is respectively connected with a resistor R2, an MCU chip and a divider resistor R3, the inverting input end of the secondary operational amplifier is respectively connected with a divider resistor R3 and a feedback resistor R4, the non-inverting input end of the secondary operational amplifier is connected with a direct current bias voltage VREF, and the output end of.
When the acquisition unit is hung on a line and current exists in the line, the electric field induction sheet inputs an induced voltage signal VDD0 into the filter, the filter can filter noise waves in the voltage signal, the resistors R1 and R2 are adjusted to obtain resistance values, the voltage signal can be subjected to primary amplification, the amplified signal is alternating current voltage taking VREF as a central axis, the resistance values of the resistors R3 and R4 are adjusted, the voltage signal can be subjected to secondary amplification, and the amplified signal is also alternating current voltage taking VREF as the central axis. When the circuit is the insulated wire, induced voltage signal VDD0 is less, and through the second grade enlargies can more effective monitoring circuit electric field change, the MCU chip passes through IO2 and judges whether unusual the change appears in the circuit electric field. When the circuit is bare conductor, the induced voltage signal VDD0 is large, after two-stage amplification, the waveform has the phenomenon of peak clipping distortion, the monitoring of the circuit electric field can be met by using the first-stage amplification signal, and the MCU chip judges whether the circuit electric field has abnormal change or not through IO 1.
The model of the two-way operational amplifier is preferably MCP6422, the power supply voltage of the MCU chip is 3.3V, and VREF is 1.25 direct-current voltage. The static power consumption of each path of amplifier of the operational amplifier MCP6422 is 4.4uA, and the current limiting resistor at the level of peripheral megaohms is added, so that the current consumption of the whole circuit is about 10uA, and the cost is saved on the premise of meeting the measurement accuracy.
The embodiment of the utility model provides a through installation on electrified line set up electric field response piece, signal conditioning unit and MCU chip, the voltage signal who will respond to through electric field response piece is input the signal conditioning unit, through the output signal that the signal conditioning unit output is used for the MCU chip to handle. The utility model discloses can make fault indicator adapt to the condition of the different wires of overhead line, effectively judge the line fault, this circuit adopts the non-contact mode simultaneously, can satisfy electrified loading and unloading demand, guarantees the distribution network even running.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A non-contact electric field measurement system for a fault indicator, the system being suspended from a line, comprising:
the electric field induction chip, the filter, the primary operational amplification circuit, the secondary operational amplification circuit and the MCU chip are connected in sequence;
the electric field induction sheet induces a voltage signal and inputs the voltage signal into the filter, the filter filters the voltage signal, the signal amplification is carried out through the primary operational amplifier circuit and the secondary operational amplifier circuit, the amplified signal is output to the MCU chip, and the MCU chip judges whether the electric field of the circuit is abnormally changed or not according to the amplified voltage signal.
2. The system of claim 1, wherein the output terminal of the filter is connected to a voltage divider resistor R1, the other terminal of the voltage divider resistor R1 is connected to the inverting input terminal of the first-stage operational amplifier, the inverting input terminal of the first-stage operational amplifier is further connected to a feedback resistor R2, the non-inverting input terminal of the first-stage operational amplifier is connected to a dc bias voltage VREF, the output terminal of the first-stage operational amplifier is connected to a resistor R2, the MCU chip and a voltage divider resistor R3, the inverting input terminal of the second-stage operational amplifier is connected to a voltage divider resistor R3 and a feedback resistor R4, the non-inverting input terminal of the second-stage operational amplifier is connected to a dc bias voltage VREF, and the output terminal.
3. The system of claim 1, wherein the electric field sensing strip is a single brass strip.
4. The system of claim 3, wherein the thickness of the electric field sensor is 1-1.5mm, the electric field sensor is rectangular, and the edge of the electric field sensor is provided with a lead pad connected to the filter via a lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922117730.0U CN211453790U (en) | 2019-11-29 | 2019-11-29 | Non-contact electric field measurement system for fault indicator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922117730.0U CN211453790U (en) | 2019-11-29 | 2019-11-29 | Non-contact electric field measurement system for fault indicator |
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| CN211453790U true CN211453790U (en) | 2020-09-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924745A (en) * | 2021-01-21 | 2021-06-08 | 季华实验室 | Nanopore gene sequencing micro-current detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924745A (en) * | 2021-01-21 | 2021-06-08 | 季华实验室 | Nanopore gene sequencing micro-current detection device |
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