CN206209033U - leakage current detection probe and leakage current detection system - Google Patents
leakage current detection probe and leakage current detection system Download PDFInfo
- Publication number
- CN206209033U CN206209033U CN201621283323.7U CN201621283323U CN206209033U CN 206209033 U CN206209033 U CN 206209033U CN 201621283323 U CN201621283323 U CN 201621283323U CN 206209033 U CN206209033 U CN 206209033U
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- leakage current
- signal
- current detection
- analog
- detection probe
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- 239000000523 sample Substances 0.000 title claims abstract description 52
- 238000001514 detection method Methods 0.000 title claims abstract description 47
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 239000013307 optical fiber Substances 0.000 claims abstract description 17
- 239000007769 metal material Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000005672 electromagnetic field Effects 0.000 abstract description 4
- 230000010363 phase shift Effects 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229960001296 zinc oxide Drugs 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The utility model relates to a reveal circuit test probe and reveal current detecting system reveals circuit test probe including acquireing the electromagnetism unit of revealing the electric current analog signal, will reveal the analog-to-digital converter that the electric current analog signal converts digital signal into and the digital signal isolating device who converts digital signal into light signal, electromagnetism unit and analog-to-digital converter are connected, and analog-to-digital converter is connected with digital signal isolating device. The leakage current detection system comprises the leakage current detection probe, an optical fiber and a receiving terminal, wherein the leakage current detection probe is connected with the optical fiber, and the optical fiber is connected with the receiving terminal. The leakage current detection probe converts the current analog signal into the optical signal on the spot, so that the phase shift error and the signal attenuation error of the current analog signal in cable transmission are avoided, the optical signal of the leakage current detection probe is transmitted by the leakage current detection system through the optical fiber, the electromagnetic interference of an external electromagnetic field can be eliminated, and the authenticity and the accuracy of the data received by the receiving terminal are ensured.
Description
Technical field
The utility model is related to arrester checks technical field, more particularly to a kind of Leakage Current detection probe and leakage
Current detecting system.
Background technology
Zinc-Oxide Arrester is most important overvoltage protection in power system, because its surface forms filthy, internal
Valve block is made moist or valve block is aging, and insulation will be caused to decline, influence electric power safety production.Arrester live detection instrument passes through electric current
Probe obtains current signal, and coupling system voltage signal to judge arrester state, and wherein the degree of accuracy of current signal is to sentencing
Disconnected arrester state is most important, and arrester Leakage Current belongs to small-signal, is in μ A~nA magnitudes.
The current analog signal that existing Leakage Current detection probe is obtained is imitated by cable transmission because cable has electric capacity
Should, current signal can phase shift and decay, cause that current phase changes and the degree of accuracy declines, influence data testing accuracy and accurate
Property.
Utility model content
Based on this, it is necessary to which the Leakage Current obtained for existing Leakage Current detection probe there is phase shift and signal declines
Subtract, Leakage Current data precision is low and the low problem of accuracy, there is provided phase shift occurs in a kind of current signal that can avoid obtaining
And signal attenuation, it is ensured that the Leakage Current data of acquisition have the Leakage Current detection probe of high accuracy and high accuracy.
A kind of Leakage Current detection probe, including obtain the electromagnetic unit of Leakage Current analog signal, by Leakage Current mould
Intend signal to be converted to the analog-digital converter of data signal and convert digital signals into the data signal isolating device of optical signal, electricity
Magnetic cell is connected with analog-digital converter, and analog-digital converter is connected with data signal isolating device.
A kind of Leakage Current detecting system, including above-mentioned Leakage Current detection probe, optical fiber and receiving terminal, leakage electricity
Stream detection probe is connected with optical fiber, and optical fiber is connected with receiving terminal.
Above-mentioned Leakage Current detection probe, including obtain the electromagnetic unit of Leakage Current analog signal, by Leakage Current mould
Intend signal to be converted to the analog-digital converter of data signal and convert digital signals into the data signal isolating device of optical signal, let out
Current analog signal is on the spot converted to optical signal by dew current detecting probe, it is to avoid current analog signal is in cable transmission
Phase displacement error and signal attenuation error, it is ensured that the Leakage Current data of acquisition have high accuracy and high accuracy.
By optical fiber be transmitted the optical signal for revealing circuit detecting probe by Leakage Current detecting system, can eliminate the external world
The electromagnetic interference of electromagnetic field, it is ensured that the authenticity and accuracy of the data received by receiving terminal.
Brief description of the drawings
Fig. 1 is the structural representation of Leakage Current detection probe in one embodiment；
Fig. 2 is the structural representation of Leakage Current detection probe in one embodiment；
Fig. 3 is the structural representation of Leakage Current detecting system in one embodiment；
Fig. 4 is the structural representation of Leakage Current detecting system in an Application Example.
Specific embodiment
In one embodiment, as shown in figure 1, a kind of Leakage Current detection probe, including acquisition Leakage Current simulation is believed
Number electromagnetic unit 110, Leakage Current analog signal is converted to data signal analog-digital converter 130 and by data signal turn
The data signal isolating device 150 of optical signal is changed to, electromagnetic unit 110 is connected with analog-digital converter 130, analog-digital converter 130
It is connected with data signal isolating device 150.
Electromagnetic unit 110 mainly include middle pressure transformer primary winding, multiple secondary coil, iron core, compensation reactor with
And fuel tank.Specifically, the electromagnetic unit in Leakage Current detection probe includes current transformer, current transformer is according to electromagnetism
What principle of induction was made, current transformer is made up of the unshakable in one's determination and winding for closing, and seldom, string exists its first side winding number of turn
In the circuit of the electric current of needs measurement, therefore whole electric currents that it often has circuit flow through, and secondary side winding turn ratio is more, string
It is connected in measuring instrumentss and protective loop, operationally, its secondary side circuit is closure to current transformer all the time, therefore is surveyed
The impedance very little of amount instrument and protective loop series coil, close to short circuit, current transformer is the working condition of current transformer
Primary side high current is converted into secondary side low current to measure, secondary side can not open a way.Further, current transformer
No-load voltage ratio is 1000:1, the current transformer gathers the Leakage Current in arrester ground wire extraction wire and will leak out current amplitude contracting
It is small 1000 times.
Analog-digital converter 130 i.e. A/D converter, or abbreviation ADC (Analog-to-Digital Converter), generally
It is the electronic component of data signal by analog-signal transitions to refer to one, because data signal does not have practical significance in itself, only
A relative size is only represented, therefore any one analog-digital converter is required for one to refer to standard of the analog quantity as conversion, than
More typical normative reference is maximum convertible signal magnitude, and the digital quantity for exporting then represents input signal relative to reference
The size of signal.Convert analog signals into the circuit of data signal, referred to as analog-digital converter, the effect of analog-to-digital conversion be by when
Between it is continuous, also continuous analog quantity is converted to the also discrete data signal of time discrete, amplitude to amplitude, therefore, analog-to-digital conversion one
As will through over sampling, holding, quantify and 4 processes of coding, in side circuit, these processes have plenty of to merge to be carried out, example
Such as, sample and keep, quantify and coding is realized simultaneously in transfer process.
Data signal isolating device 150 is used to for digital electric signal to be converted to optical signal, such as be by light emitting diode
Be capable of achieving to convert electrical signals to optical signal, it is non-essential, data signal isolating device can include modulation light emitting diode and
Light signal transmitter, can be specifically that the switched data signal of analog-digital converter is converted into light by modulating light emitting diode
Signal, optical signal sends by light signal transmitter again.Light emitting diode is one kind of semiconductor diode, can be electricity
Signal changes into optical signal.
Above-mentioned Leakage Current detection probe, including obtain the electromagnetic unit of Leakage Current analog signal, by Leakage Current mould
Intend signal to be converted to the analog-digital converter of data signal and convert digital signals into the data signal isolating device of optical signal, let out
Current analog signal is on the spot converted to optical signal by dew current detecting probe, it is to avoid current analog signal is in cable transmission
Phase displacement error and signal attenuation error, it is ensured that the Leakage Current data of acquisition have high accuracy and high accuracy.
In one embodiment, Leakage Current detection probe also includes radome, electromagnetic unit, analog-digital converter and numeral
Signal isolating device is built in radome.Analog-digital converter and digital signal isolating device are integrated in Leakage Current detection probe
Portion, is in same radome with electromagnetic unit, it is ensured that the antijamming capability of Leakage Current detection probe.Specifically, shielding
Cover is the closure being made up of metal material, and all devices in Leakage Current detection probe are encapsulated, and shields electromagnetism
Interference, and ensure the safety of equipment by being grounded, be integrated in all devices inside radome by Leakage Current probe, effectively disappears
Influence except external environment to electronic device, reduces electromagnetic unit secondary side to the cable length of other electronic devices as far as possible,
Ensure that electromagnetic unit secondary side circuit is closed all the time simultaneously, open circuit will not occur and produce overvoltage.
In one embodiment, as shown in Fig. 2 Leakage Current detection probe also includes analog signal amplifier 120, electromagnetism
Unit 110 is connected by analog signal amplifier 120 with analog-digital converter 130.Analog signal amplifier need to ensure electromagnetic unit
Secondary side circuit is closed all the time, does not produce overvoltage, while the leakage current analog signal that electromagnetic unit is gathered amplifies N times,
Ensure the precision of data.After the leakage current analog signal that analog signal amplifier gathers electromagnetic unit amplifies N times, through modulus
Converter is converted to data signal, can realize eliminating the electromagnetic interference of cable and external electromagnetic field to signal.Further,
Leakage Current detection probe also include discharge tube 160, discharge tube 160 respectively with electromagnetic unit 110 and analog signal amplifier 120
Connection, discharge tube can suppress voltage magnitude, can effectively protect the electronic device in leakage circuit detecting probe.
In one embodiment, as shown in Fig. 2 Leakage Current detection probe also includes digital signal processor 140, modulus
Converter 130 is connected by digital signal processor 140 with data signal isolating device 150.Digital signal processor is to through mould
The data signal of number converter treatment carries out data conversion, and data filtering and data packing are processed, and improve current data collection accurate
True property, it is ensured that data communication quality.
In one embodiment, as shown in figure 3, a kind of Leakage Current detecting system, including Leakage Current detection probe
100th, optical fiber 200 and receiving terminal 300, Leakage Current detection probe 100 are connected with optical fiber 200, optical fiber 200 and receiving terminal
300 connections, wherein Leakage Current detection probe 100 include the electromagnetic unit 110, the analog signal amplifier 120, mould that are sequentially connected
Number converter 130, digital signal processor 140 and data signal isolating device 150, discharge tube 160 respectively with electromagnetic unit
110 and analog signal amplifier 120 connect.
In one embodiment, Leakage Current detecting system includes Leakage Current detection probe, optical fiber and receiving terminal,
Leakage Current detection probe includes the electromagnetic unit and electronic circuit cell that are connected with each other, in electromagnetic unit and electronic circuit cell
It is placed in shielding case, shielding case ground connection.Further, electronic circuit cell include be sequentially connected analog signal amplifier,
Analog-digital converter, digital signal processor and data signal isolating device.
Electric current in electromagnetic unit measurement arrester group on ground lead, obtains the analog signal of three-phase Leakage Current through electricity
Its amplitude is reduced 1000 times by magnetic cell, then by the analog signal amplifier in electronic circuit cell by Leakage Current signal
Amplify N times, the analog signal after amplification is then converted into data signal by the analog-digital converter in electronic circuit cell, then
Data operation, data filtering and data packing are carried out to current digital signal by digital signal processor to process.Data signal
Digital electric signal is converted to optical signal by isolating device by modulating light emitting diode, and optical signal is sent out by light signal transmitter again
Optical fiber head end is delivered to, receiving terminal is transmitted through the fiber to.Being present in the discharge tube in electronic circuit cell can suppress voltage
Amplitude, can effectively protect electronic circuit cell.Electronic circuit cell is integrated in inside Leakage Current detection probe, with electromagnetic unit
It is in same shielding case, it is ensured that the antijamming capability of Leakage Current detection probe.Optical signal is transmitted by optical fiber, can
Eliminate the electromagnetic interference of external electromagnetic field, it is ensured that the authenticity and accuracy of the data received by receiving terminal.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and its description is more specific and detailed,
But therefore can not be interpreted as the limitation to utility model patent scope.It should be pointed out that for the common skill of this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
Protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (9)
1. a kind of Leakage Current detection probe, it is characterised in that including obtaining the electromagnetic unit of Leakage Current analog signal, by institute
Leakage Current analog signal is stated to be converted to the analog-digital converter of data signal and the data signal is converted to the number of optical signal
Word signal isolating device, the electromagnetic unit is connected with the analog-digital converter, the analog-digital converter and the data signal
Isolating device is connected.
2. Leakage Current detection probe according to claim 1, it is characterised in that also including radome, the electromagnetism list
First, described analog-digital converter and the data signal isolating device are built in the radome.
3. Leakage Current detection probe according to claim 2, it is characterised in that the radome is made up of metal material
Radome.
4. Leakage Current detection probe according to claim 1, it is characterised in that also including analog signal amplifier, institute
Electromagnetic unit is stated to be connected with the analog-digital converter by the analog signal amplifier.
5. Leakage Current detection probe according to claim 4, it is characterised in that also including discharge tube, the discharge tube
It is connected with the electromagnetic unit and the analog signal amplifier respectively.
6. Leakage Current detection probe according to claim 1, it is characterised in that also including digital signal processor, institute
Analog-digital converter is stated to be connected with the data signal isolating device by the digital signal processor.
7. Leakage Current detection probe according to claim 1, it is characterised in that the electromagnetic unit includes Current Mutual Inductance
Device.
8. Leakage Current detection probe according to claim 7, it is characterised in that the no-load voltage ratio of the current transformer is
1000:1。
9. a kind of Leakage Current detecting system, it is characterised in that including optical fiber, receiving terminal and as claim 1-8 is any
Leakage Current detection probe described in one, the Leakage Current detection probe is connected with the optical fiber, the optical fiber with it is described
Receiving terminal is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621283323.7U CN206209033U (en) | 2016-11-25 | 2016-11-25 | leakage current detection probe and leakage current detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621283323.7U CN206209033U (en) | 2016-11-25 | 2016-11-25 | leakage current detection probe and leakage current detection system |
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| Publication Number | Publication Date |
|---|---|
| CN206209033U true CN206209033U (en) | 2017-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621283323.7U Active CN206209033U (en) | 2016-11-25 | 2016-11-25 | leakage current detection probe and leakage current detection system |
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| CN (1) | CN206209033U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525998A (en) * | 2017-09-08 | 2017-12-29 | 广东电网有限责任公司东莞供电局 | System and method for detecting leakage current of zinc oxide arrester |
| CN114019410A (en) * | 2021-10-20 | 2022-02-08 | 广西电网有限责任公司崇左供电局 | Digital lightning arrester leakage current online monitoring device and method |
-
2016
- 2016-11-25 CN CN201621283323.7U patent/CN206209033U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525998A (en) * | 2017-09-08 | 2017-12-29 | 广东电网有限责任公司东莞供电局 | System and method for detecting leakage current of zinc oxide arrester |
| CN114019410A (en) * | 2021-10-20 | 2022-02-08 | 广西电网有限责任公司崇左供电局 | Digital lightning arrester leakage current online monitoring device and method |
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