CN109765440A - The sub- lightning current monitoring device of Intelligent insulation - Google Patents
The sub- lightning current monitoring device of Intelligent insulation Download PDFInfo
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- CN109765440A CN109765440A CN201811608245.7A CN201811608245A CN109765440A CN 109765440 A CN109765440 A CN 109765440A CN 201811608245 A CN201811608245 A CN 201811608245A CN 109765440 A CN109765440 A CN 109765440A
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Abstract
The invention discloses a kind of sub- lightning current monitoring devices of Intelligent insulation, comprising: current acquisition sensor, for acquiring current signal；Signal processing module, the current signal for acquiring to current acquisition sensor are handled；Breakdown judge module, A/D converter circuit transformation result dma mode is first stored in array by MCU, after AD conversion, data in array are subjected to the processing of clipping algorithm of signal-wobble elimination, it then will treated data and thunder and lightning normalized current waveform comparison, such as it is judged as non-lightning current, judge whether current duration is greater than failure current thresholds, collected current waveform is subjected to frequency calculating, judge whether it is power frequency short circuit current frequency, if conditions above meets, it is determined as zinc oxide valve plate failure, and record time of failure.The present invention can accomplish to monitor automatically, not only monitor it is more accurate quickly, but also compared with manual inspection, reduce labor intensity and monitoring cost.
Description
Technical field
The present invention relates to distribution line insulators, and in particular to insulator lightning current monitoring device.
Background technique
For distribution line insulator, power supply department need to spend a large amount of human and material resources and time to making an inspection tour every year.
The operating condition of the facilities and equipments such as insulator, arrester is checked, also needs to increase night inspection for investigation zero resistance insulator sometimes,
Observe by the naked eye discharge scenario, ear listens the primitive approach operation such as discharging sound, and effect is extremely undesirable, often waits until that failure is sent out
Just exposure is gone wrong after life.
Current anti-thunder insulator, damage of itself breaking down, or whether by situations such as lightning strokes, there is still a need for logical
Manual inspection is crossed to be checked.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of sub- lightning current monitoring devices of Intelligent insulation, send out itself
Raw failure still can be monitored by the case where lightning stroke automatically.
In order to solve the above technical problems, the present invention adopts the following technical scheme: the sub- lightning current monitoring device of Intelligent insulation, packet
It includes:
Current acquisition sensor, for acquiring current signal；
Signal processing module, the current signal for acquiring to current acquisition sensor are handled, including filter circuit,
Integrating amplification circuit and A/D converter circuit, the filter circuit filter out high-frequency interferencing signal, and the integrating amplification circuit is to letter
It number is integrated and is amplified, the A/D converter circuit converts analog signals into digital signal；
Breakdown judge module, A/D converter circuit transformation result dma mode is first stored in array by MCU, when AD conversion knot
Data in array are carried out the processing of clipping algorithm of signal-wobble elimination by Shu Hou, then will treated data and thunder and lightning normalized current waveform ratio
Compared with being such as judged as non-lightning current, judge whether current duration is greater than failure current thresholds, by collected current waveform
Frequency calculating is carried out, power frequency short circuit current frequency is judged whether it is, if conditions above meets, is determined as zinc oxide valve plate event
Hinder, and record time of failure, wherein the judgment method of lightning current are as follows: takes the failing edge of lightning current waveform as thunder and lightning
The judgment criteria of generation compares the failing edge of collected lightning current waveform and thunder and lightning normalized current waveform failing edge
Compared with judging whether in the waveform variation range that algorithm is set, such as in waveform variation range, then judge that collected thunder and lightning is electric
The duration of waveform failing edge is flowed whether in the time range of standard lightning current failing edge, if in time range,
The total time of collected lightning current waveform is judged whether in the time range of standard lightning current, if conditions above is full up
Foot is then determined as that a thunder and lightning occurs, and records thunder and lightning time of origin；
Window comparator, under no thunder and lightning and the trouble-free situation of equipment, equipment is constantly in standby mode, when there is thunder and lightning
When miscarriage is raw, by filter circuit and integrating amplification circuit treated shape that current signal first passes through window comparator to interrupt
Formula wake-up device, equipment is AD converted acquisition to the amplified signal of integral after waking up, when collection voltages are continuously less than minimum
When threshold value, stops AD conversion, handled by signal of the MCU to acquisition；Power module is powered for whole equipment.
Alternatively, the current acquisition sensor uses Rogowski coil.The filter circuit is fertile using second order Bart
This filter.
Preferably, it is primary to be set as 1us for the frequency acquisition of AD conversion acquisition.
The present invention acquires current signal by adopting the above technical scheme, by current acquisition sensor, and uses signal processing
Module handles current signal, finally by the analysis to signal, judges whether it is lightning current and zinc oxide valve plate
Failure can accomplish to monitor automatically, not only monitor it is more accurate quickly, but also compared with manual inspection, reduce labor intensity
And monitoring cost.
The specific technical solution of the present invention and its advantages will in the following detailed description in conjunction with attached drawing into
Row detailed description.
Detailed description of the invention
Present invention will be further described below with reference to the accompanying drawings and specific embodiments:
Fig. 1 is structural block diagram of the invention；
Fig. 2 is breakdown judge flow chart of the present invention；
Fig. 3 is lightning current impact test apparatus schematic diagram.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the present invention and its application or make
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Referring to fig. 1 and fig. 2, the sub- lightning current monitoring device of Intelligent insulation, comprising:
Current acquisition sensor, for acquiring current signal；
Signal processing module, the current signal for acquiring to current acquisition sensor are handled, including filter circuit,
Integrating amplification circuit and A/D converter circuit, the filter circuit filter out high-frequency interferencing signal, and the integrating amplification circuit is to letter
It number is integrated and is amplified, the A/D converter circuit converts analog signals into digital signal；
Breakdown judge module, A/D converter circuit transformation result dma mode is first stored in array by MCU, when AD conversion knot
Data in array are carried out the processing of clipping algorithm of signal-wobble elimination by Shu Hou, then will treated data and thunder and lightning normalized current waveform ratio
Compared with being such as judged as non-lightning current, judge whether current duration is greater than failure current thresholds, by collected current waveform
Frequency calculating is carried out, power frequency short circuit current frequency is judged whether it is, if conditions above meets, is determined as zinc oxide valve plate event
Hinder, and record time of failure, wherein the judgment method of lightning current are as follows: takes the failing edge of lightning current waveform as thunder and lightning
The judgment criteria of generation compares the failing edge of collected lightning current waveform and thunder and lightning normalized current waveform failing edge
Compared with judging whether in the waveform variation range that algorithm is set, such as in waveform variation range, then judge that collected thunder and lightning is electric
The duration of waveform failing edge is flowed whether in the time range of standard lightning current failing edge, if in time range,
The total time of collected lightning current waveform is judged whether in the time range of standard lightning current, if conditions above is full up
Foot is then determined as that a thunder and lightning occurs, and records thunder and lightning time of origin；
Window comparator, under no thunder and lightning and the trouble-free situation of equipment, equipment is constantly in standby mode, when there is thunder and lightning
When miscarriage is raw, by filter circuit and integrating amplification circuit treated shape that current signal first passes through window comparator to interrupt
Formula wake-up device, equipment is AD converted acquisition to the amplified signal of integral after waking up, when collection voltages are continuously less than minimum
When threshold value, stops AD conversion, handled by signal of the MCU to acquisition；Power module is powered for whole equipment.
Wherein, the current acquisition sensor uses Rogowski coil.Current acquisition sensor based on Rogowski coil has
Electric current can real-time measurement, fast response time, will not be saturated, almost without phase error the characteristics of.The filter circuit uses two
Rank Butterworth filter.The characteristics of Butterworth filter is that the frequency response curve of passband is most smooth.AD conversion acquisition
Frequency acquisition to be set as 1us primary.Power module is taken using online induction to be electrically coupled internal battery mode and powers.
Furthermore it is also possible to include sending server for number of lightning strokes and lightning stroke time by narrowband Internet of Things.The clothes
Device backstage be engaged in for reception data preservation, and is sent to client displaying.
To detect intelligent voltage limiter (the i.e. above-mentioned sub- lightning current monitoring device of Intelligent insulation) when passing through lightning current, can remember
The lower waveform and time by lightning current of record is verified by comparing with the practical lightning current waveform by intelligent voltage limiter
The reliability of intelligent voltage limiter.Therefore, intelligent voltage limiter lightning current impact test apparatus as shown in Figure 3, in figure: TY: pressure regulation
Device, SB: testing transformer, D: silicon stack, C: capacitor, R: wave regulating resistor, L: harmonic inductance, FL: current divider, CY: measuring instrument,
FY: divider.The current divider connect measuring instrument with divider, is boosted by pressure regulator to testing transformer, tests transformation
Device secondary side voltage charges after being rectified by silicon stack to capacitor, and after charging complete, gap breakdown passes through wave regulating resistor and harmonic
Inductance discharges to intelligent voltage limiter, by measuring instrument measurement by the actual current value and residual voltage value of intelligent voltage limiter, and will
The waveform that measured waveform is monitored with intelligent voltage limiter compares.
When intelligent voltage limiter does not damage normally, the electric current by intelligent voltage limiter is almost nil, works as zinc oxide resistance sheet
After failure, if having lasting power current and passing through, form single-phase connects at this point, the conducting wire at intelligent voltage limiter is punctured by thunder and lightning
Earth fault, Rogowski coil is equipped on intelligent voltage limiter, monitoring can determine whether the oxygen of product herein by the curent change of product
Change whether zinc damages.
When intelligent voltage limiter does not damage normally, after lightning current, collected waveform should be normal lightning wave
Shape, the time is in us grade, if collected waveform still suffers from after normal lightning wave after zinc oxide resistance sheet damage
Lasting electric current passes through.
The high pressure of Intelligent insulation is terminated into power frequency 6kV voltage, low-pressure end ground connection, by zinc oxide valve plate partial shorts, mould
Quasi- zinc oxide valve plate malfunction carries out actual measurement to the current conditions after formation short circuit, and collects with Intelligent insulation
Current conditions compare, confirmation Intelligent insulation can receive fault current and make indicating fault.
In addition to above preferred embodiment, there are other embodiments of the invention, and those skilled in the art can be according to this
Invention makes various changes and modifications, and as long as it does not depart from the spirit of the invention, should belong in claims of the present invention and determines
The range of justice.
Claims (4)
1. the sub- lightning current monitoring device of Intelligent insulation, characterized by comprising:
Current acquisition sensor, for acquiring current signal；
Signal processing module, the current signal for acquiring to current acquisition sensor are handled, including filter circuit, integral
Amplifying circuit and A/D converter circuit, the filter circuit filter out high-frequency interferencing signal, the integrating amplification circuit to signal into
Row integrates and amplifies, and the A/D converter circuit converts analog signals into digital signal；
Breakdown judge module, A/D converter circuit transformation result dma mode is first stored in array by MCU, after AD conversion,
Data in array are subjected to the processing of clipping algorithm of signal-wobble elimination, then will treated data and thunder and lightning normalized current waveform comparison, such as
It is judged as non-lightning current, judges whether current duration is greater than failure current thresholds, collected current waveform is carried out
Frequency calculates, and judges whether it is power frequency short circuit current frequency, if conditions above meets, is determined as zinc oxide valve plate failure, and
Time of failure is recorded, wherein the judgment method of lightning current are as follows: the failing edge of lightning current waveform is taken to occur as thunder and lightning
Judgment criteria, the failing edge of collected lightning current waveform is compared with thunder and lightning normalized current waveform failing edge, is sentenced
Break whether in the waveform variation range of algorithm setting, such as in waveform variation range, then judges collected lightning current wave
Whether the duration of shape failing edge is in the time range of standard lightning current failing edge, if judged in time range
Whether the total time of collected lightning current waveform is in the time range of standard lightning current, if the full up foot of conditions above,
It is determined as that a thunder and lightning occurs, and records thunder and lightning time of origin；
Window comparator, under no thunder and lightning and the trouble-free situation of equipment, equipment is constantly in standby mode, when there is thunder and lightning miscarriage
When raw, by filter circuit and integrating amplification circuit, treated that current signal first passes through window comparator calls out in the form interrupted
Awake equipment, equipment is AD converted acquisition to the amplified signal of integral after waking up, when collection voltages are continuously less than minimum threshold
When, stop AD conversion, is handled by signal of the MCU to acquisition；Power module is powered for whole equipment.
2. the sub- lightning current monitoring device of Intelligent insulation according to claim 1, it is characterised in that: the current acquisition sensing
Device uses Rogowski coil.
3. the sub- lightning current monitoring device of Intelligent insulation according to claim 1, it is characterised in that: the filter circuit uses
Second order Butterworth filter.
4. the sub- lightning current monitoring device of Intelligent insulation according to claim 1, it is characterised in that: the acquisition of AD conversion acquisition
It is primary that frequency is set as 1us.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811608245.7A CN109765440A (en) | 2018-12-27 | 2018-12-27 | The sub- lightning current monitoring device of Intelligent insulation |
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| CN201811608245.7A CN109765440A (en) | 2018-12-27 | 2018-12-27 | The sub- lightning current monitoring device of Intelligent insulation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110426573A (en) * | 2019-07-24 | 2019-11-08 | 国网湖南省电力有限公司 | A kind of lightning protection anti-ice-flashover composite insulator on-line monitoring method |
| CN110907707A (en) * | 2019-12-06 | 2020-03-24 | 广东电网有限责任公司 | Device and method for testing influence of ground wire claw gap discharge on unmanned aerial vehicle |
| CN112858770A (en) * | 2021-01-26 | 2021-05-28 | 广东电网有限责任公司广州供电局 | Anti-interference lightning current detection device |
| CN113484697A (en) * | 2021-05-19 | 2021-10-08 | 北京宏优科技发展有限公司 | Insulator leakage analysis system and method |
| WO2022082339A1 (en) * | 2020-10-19 | 2022-04-28 | 国网浙江诸暨市供电有限公司 | Intelligent insulator lightning current monitoring device and intelligent insulator fault determination method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110907707A (en) * | 2019-12-06 | 2020-03-24 | 广东电网有限责任公司 | Device and method for testing influence of ground wire claw gap discharge on unmanned aerial vehicle |
| WO2022082339A1 (en) * | 2020-10-19 | 2022-04-28 | 国网浙江诸暨市供电有限公司 | Intelligent insulator lightning current monitoring device and intelligent insulator fault determination method |
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