CN101706531B - Method for testing insulation performance of insulator - Google Patents
Method for testing insulation performance of insulator Download PDFInfo
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- CN101706531B CN101706531B CN2009100447315A CN200910044731A CN101706531B CN 101706531 B CN101706531 B CN 101706531B CN 2009100447315 A CN2009100447315 A CN 2009100447315A CN 200910044731 A CN200910044731 A CN 200910044731A CN 101706531 B CN101706531 B CN 101706531B
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Abstract
The invention discloses a method for testing insulation performance of insulator and a device thereof. The test method comprises the following steps: initializing zero value critical resistance R1 and low value critical resistance R2 of a tested insulator; exerting DC high voltage on the tested insulator under power-off state; collecting leakage current flowing through the tested insulator; calculating insulating resistance R by combining with volt-ampere method according to the exerted DC high voltage and collected leakage current obtained in the above steps; comparing the calculated insulating resistance R with zero value critical resistance R1 and low value critical resistance R2, then outputting the comparison result of the performance of the tested insulator. The test device comprises a high voltage power unit (1), a current collecting unit (2), and a processing unit (3). The invention has the advantages of broad application scope, applicability to on-site operation, intelligent measurement, rapid test, convenient operation, high measurement preciseness, abundant forms of output result, and good portability.
Description
Technical field
The present invention relates to the electric power safety field, be specifically related to a kind of insulator dielectric performance detection method.
Background technology
The used insulator of China's electrical network is porcelain insulator mostly now; The insulating property of new insulator are better, and still along with the operation of transmission line of electricity, insulator can wear out gradually; The insulation resistance of insulator can diminish, insulating property can reduce, and becomes low resistance insulator or zero resistance insulator.Cause the main cause of low resistance insulator to have: one, insulator deterioration, insulator are standing gravity load and the Nature, sunlight, the rain of electric field, circuit, the effect of snow, inevitable deterioration gradually for a long time; Two, insulator surface amasss dirt, pollution layer is moistening, causes the insulator dielectric performance to reduce; Thunder and lightning then possibly directly cause insulator to damage insulator breakdown if the low resistance insulator degree is on the rise perhaps, causes occurring zero resistance insulator.Because the existence of the poor insulator of null value, low value has increased the probability that lightning stroke flashover and pollution flashover take place, the power supply reliability of electrical network is descended.When containing the insulator chain generation flashover of poor insulator, its short-circuit current can pass through from insulator inside, and the thermal effect of generation possibly make insulator steel cap blow, thereby phenomenons such as insulator chain breaks off, lead lands occur, and causes serious accident; Secondly, the existence of a large amount of low resistance insulators has increased the kwh loss of electrical network, and this also is the one side reason that not clear electric weight is lost, and has caused the serious wasting of resources.To low resistance insulator, if surface area is dirty, pollution layer is moistening, then can clear up insulator, if the insulator deterioration, then visual actual conditions are changed and are handled; To zero resistance insulator, usually directly change processing.Therefore to the insulating property of insulator in the transmission line of electricity of operation detect be guarantee that high pressure is defeated, one of the critical problem of distribution line safe operation.
Insulator method for testing performance commonly used at present is charged online detection method, and the method for common online detection insulator performance mainly contains:
Spark fork method: be the most frequently used detection method at present, this method is contact with insulator according to the spark fork whether producing discharges judges that insulator is fine or not.This method has two shortcomings: it is low that the first need be measured the time-consuming efficient of taking a lot of work of all insulators one by one; It two is that the sound of spark discharge is flooded by corona sound and distance is difficult to listen accurate when detecting.If existing several exist null value or low value phenomenon in the insulator chain, when utilizing spark fork method that other insulators are detected, flashover fault over the ground possibly take place, jeopardize the personal safety of survey crew, cause the line tripping power outage simultaneously.
Bead electric discharge: be detection method commonly used at present.This method is that the distance when producing discharge through the bead of measuring the insulator two ends judges that the voltage of insulator distributes, thereby judges whether tested insulator is normal.This method will frequently be adjusted the bead distance, and False Rate is bigger.
Thermal infrared imager method: be present more advanced detection method.It is to utilize the thermal effect principle of insulator surface to carry out online detection.This method is very effective to the pollution proof insulator that scribbles semi-conducting glaze.Because during the online charging operation of this type of insulator, the surface current of normal insulation is bigger, and temperature rise is higher, and the surface temperature of inferior insulator was easy to discern with thermal infrared imager than the sub low good several years of normal insulation.But for the porcelain insulator of glass insulator or common glaze, its normal surface temperature only differs about 1 ℃ than inferior insulator surface temperature, under the weather conditions and site environment of complicacy, measures and difficulty, and precision is difficult to guarantee.
Laser dopper flowmeter vibratory drilling method: utilize ftractureed the centre of oscillation frequency of insulator and different features just often; Through external force as knocking iron tower or with ultrasound wave that ultrasonic generator produced; Aim at tested insulator or aim at tested insulator with the parabolic type catoptron with lasing light emitter; To evoke the microvibration of insulator, the tested insulator of laser alignment that then the laser dopper flowmeter appearance is sent is according to the analysis to the frequency spectrum of the signal that reflects; Thereby obtain the centre of oscillation frequency values of this insulator, judge the quality of this insulator in view of the above.But because this instrument detects invalid problem and bulky, heavy to uncracked insulator, use and keep in repair shortcomings such as complicacy, cost height, limited its scope of application.
The ultraviolet imagery method: the ultraviolet imagery appearance can directly detect the discharge process before the unit exception temperature rise, is the main method of discharge examination in the world.The ultraviolet imagery appearance is compared with other detection meanss; Have and observe advantages such as directly perceived, that foresight is good, observed range is far away; But owing to the ultraviolet imagery appearance costs an arm and a leg, and can only observe stronger discharge signal, so it can only be main to detect corona, shelf depreciation and electric arc generally speaking.And the discharge of insulator is very faint, even there is inferior insulator to occur, generally shows as the increase of air ionization, does not occur significantly discharge as yet.Receive ultraviolet imagery appearance CMOS luminous sensitivity and the remote restriction that detects, before the faint air ionization of insulator develops into electric arc, be difficult to observe through the ultraviolet imagery appearance.
It is thus clear that; All there is certain defective in above the whole bag of tricks, and, in China; Have only prefecture-level above power department that the hot line job personnel are just arranged, therefore can't carry out charged detection to line insulator easily and effectively in no hot line job personnel's prefecture-level following area.Adopt the power failure detection method to mainly contain the megger mensuration at present; But because operation danger coefficient very inconvenient, high-altitude application is very high on shaft tower; Often need insulator be taken off from shaft tower, operation is inconvenience very, wastes time and energy; Cause grid power blackout long detection time, influence the use of electrical network.
Summary of the invention
The present invention is directed to the shortcoming of above-mentioned prior art, provide a kind of applied widely, be suitable for execute-in-place, measure intelligence, detections is quick, easy to operate, measuring accuracy is high, the output result formats is enriched, insulator dielectric performance detection method easy to carry.
In order to solve the problems of the technologies described above, the technical scheme that the present invention adopts is: the present invention provides a kind of insulator dielectric performance detection method, and implementation step is following:
1) the null value critical resistance R1 of the tested insulator of initialization and low value critical resistance R2;
2) the tested insulator under the power down mode is applied dc high voltage;
3) acquisition stream is through the leakage current of tested insulator;
4) according to step 2) leakage current that collects of the dc high voltage that applies and step 3), calculate the insulation resistance R of tested insulator in conjunction with voltammetry;
5) the insulation resistance R and null value critical resistance R1, the low value critical resistance R2 that step 4) are calculated compare, and export the comparative result to the performance of tested insulator then.
As the further improvement of the above-mentioned detection method of the present invention, before the output comparative result, comprise step in the said step 5) with said comparative result storage; The output form of the comparative result in the said step 5) is form of sound, visual form or data file form.
The present invention has following advantage: the present invention detects leakage current through the insulator that has a power failure is applied high voltage; Calculate the resistance of tested insulator according to voltammetry then and judge that directly insulator is null value, low value or normal information; Have the intelligence measured, detect quick, the abundant advantage of output result formats; After measurement, can temporarily store each tested insulator testing result; The hot line job personnel that do not need specialty make that the efficient that detects in the real work is higher, and speed is faster when detecting in a large number.Insulator dielectric performance detection device of the present invention can adapt to multiple insulator through exporting multiple high voltage in the high-voltage power supply unit, has advantage applied widely; The current acquisition unit crosses the magnitude of voltage of sample resistance through acquisition stream and through amplifying the back input processing unit, the precision of the current signal of collection is high, measures accurately and reliably; Insulator dielectric performance detection device of the present invention in addition is provided with voice-output unit, display unit or data transmission unit; Man-machine interaction mode is abundant; Make that the detection operating efficiency is higher, the present invention adopts storage battery power supply and adopts ST to contact the two ends of tested insulator, makes whole device small and exquisite nimble; Easy to carry, and ST is very laborsaving, easy to operate when detecting.
Description of drawings
Fig. 1 is the schematic flow sheet of detection method of the present invention;
Fig. 2 is the framed structure synoptic diagram of pick-up unit in the embodiment of the invention;
Fig. 3 is the circuit theory synoptic diagram of embodiment of the invention mesohigh power supply unit (sample resistance that contains the current acquisition unit);
Fig. 4 is the circuit theory diagrams of current acquisition unit amplifying circuit in the embodiment of the invention;
Fig. 5 is the circuit theory synoptic diagram of processing unit in the embodiment of the invention;
Fig. 6 is the power circuit diagram of processing unit in the embodiment of the invention;
Fig. 7 is the amplifying circuit principle schematic of voice-output unit in the embodiment of the invention;
Fig. 8 is the circuit theory synoptic diagram of display unit in the embodiment of the invention;
Fig. 9 is the structural representation of ST in the embodiment of the invention.
Embodiment
As shown in Figure 1, the practical implementation step of insulator dielectric performance intelligent detecting method of the present invention is following:
1) the null value critical resistance R1 of the tested insulator of initialization and low value critical resistance R2;
2) the tested insulator under the power down mode is applied dc high voltage;
3) acquisition stream is through the leakage current of tested insulator;
4) according to step 2) leakage current that collects of the dc high voltage that applies and step 3), calculate the insulation resistance R of tested insulator in conjunction with voltammetry;
5) the insulation resistance R and null value critical resistance R1, the low value critical resistance R2 that step 4) are calculated compare, and export the comparative result to the performance of tested insulator then.
In the step 5); At first insulation resistance R and null value critical resistance R1 are compared; If R＜=R1 then export the message of insulator null value; Otherwise again insulation resistance R and low value critical resistance R2 are compared: if R＜=R2 (is R1＜R＜=R2) then exports the information of insulator low value, if R＞R2 then export the normal information of insulator.
In the present embodiment; Transmission line of electricity is the transmission line of electricity of 110KV, and the insulation resistance of normal WP--7 porcelain insulator is 300M Ω, and null value critical resistance R1 value is 1M Ω; Low value critical resistance R2 value is 10M Ω; Because the electric pressure of transmission line of electricity is different with the model of used insulator, the value of critical insulation resistance R1 of null value and the critical insulation resistance R2 of low value can be variant, and the operating personnel can carry out the scene according to condition of different and set.
In the present embodiment; Consider in the actual detected process; Operating personnel are movable inconvenient on shaft tower, therefore in step 5), before the output comparative result, comprise the step with said comparative result storage; Thereby operating personnel can carry out batch to insulator to be checked and stores, and after detection finishes, testing result is exported then.For the ease of handling, the output form of the comparative result in the step 5) is form of sound, visual form or data file form.
As shown in Figure 2; Insulator dielectric performance intelligent detection device in the embodiment of the invention is made up of high-voltage power supply unit 1, current acquisition unit 2, processing unit 3, voice-output unit 4, display unit 5, input block 6, storage unit 7 and ST 8: the output terminal of high-voltage power supply unit 1 is connected with the two ends of tested insulator, is used to tested insulator high voltage is provided.Current acquisition unit 2 is serially connected with in the loop at tested insulator place; Be used for the Leakage Current of acquisition stream through tested insulator; The output terminal of current acquisition unit 2 links to each other with processing unit 3, and processing unit 3 is judged the insulating property of insulator to be detected according to the insulation resistance of said Leakage Current and high-voltage power supply unit 1 output HIGH voltage value calculating insulator and according to this insulation resistance.Input block 6 links to each other with processing unit 3; In the present invention; High-voltage power supply unit 1 comprises the different high-tension output ports of a plurality of outputs; Input block 6 comprises the corresponding button of a plurality of output HIGH voltages with high-voltage power supply unit 1, and this button is used to trigger the output voltage values of processing unit 3 initialization high-voltage power supply unit 1.Voice-output unit 4 links to each other with processing unit 3 with display unit 5, and voice-output unit 4 and display unit 5 are used to export the judged result of 3 pairs of tested insulator dielectric performances of processing unit.Storage unit 7 links to each other with processing unit 3, and storage unit 7 is used for the judged result of 3 pairs of tested insulator dielectric performances of storage processing unit.ST 8 links to each other with the output terminal of high-voltage power supply unit 1, is used for contacting with the position, two ends of tested insulator.
As shown in Figure 3, high-voltage power supply unit 1 adopts storage battery power supply, and high-voltage power supply unit 1 is made up of switch integrated circuit 11, control circuit for pulse-width modulation 12 and step-up transformer 13: switch integrated circuit 11 selects for use the TWH8751 chip as switching device; Control circuit for pulse-width modulation 12 is selected the TL494 chip for use, is used in time changing the conducting width of switching element T WH8751, thus the voltage of output expectation stably, and over-voltage over-current protection is provided; Step-up transformer 13 adopts the single-ended reverse exciting mode; Can produce stable 2000V or 3000V DC voltage through single-ended reverse exciting high-voltage power supply unit 1; Be provided with 2 groups of taps of corresponding direct current 2000V of difference and 3000V at the secondary side of step-up transformer 13; Throwing the gears of rotary switches can select as required to link by the user more; So that secondary side tap and corresponding output voltage sampling resistor are switched simultaneously, can adjust the dc high voltage that puts on insulator to be measured easily, suitable especially miniwatt occasion.
Like Fig. 3, shown in 4, current acquisition unit 2 is made up of sample resistance R17A and amplifying circuit, and said sample resistance is serially connected with in the loop at tested insulator place; The input port of said amplifying circuit links to each other with the sample resistance two ends; Amplifying circuit be used to gather the voltage signal at sample resistance two ends and amplify after input to processing unit 3, in processing unit 3 inside, can be through software programming; Convert this voltage signal into current signal, thus the leakage current at the insulator two ends that obtain flowing through.The leakage current at insulator two ends is very little owing to flow through, and after the d. c. voltage signal that therefore collects amplifies, can improve the precision to the insulator resistance detection.
As shown in Figure 5; The CPU module of processing unit 3 adopts Ling Yang SPCE061A 16-bit single-chip processor; In have 7 path 10 position voltage A/D converters (ADC); Therefore can be through the simulating signal of current sensor input in the digital signal of single-chip microcomputer internal conversion for supplying single-chip microcomputer to handle, the V_IN+ pin of SPCE061A links to each other with current acquisition unit 2.Can know the resistance R=U/Ig of tested insulator according to voltammetry; Flowing through the leakage current I g of tested insulator and the electric current of the sample resistance of flowing through again equates; Therefore can know Ig=Us/Rs; Wherein Us is the magnitude of voltage at sample resistance two ends, and Rs is the resistance value of sample resistance, therefore can know the resistance R=URs/Us of tested insulator.After SPCE061A collects the magnitude of voltage Us at sample resistance two ends through current acquisition unit 2, calculate the insulation resistance of tested insulator immediately according to R=URs/Us, for the dc high voltage U initialization in processing unit 3 in advance of high-voltage power supply unit 1 output.Because it is 2.6～3.6V (CPU) that the SPCE061A WV has following requirement: VDD, VDDH is VDD～5.5V (I/O); So adopt microcontroller power supply circuit shown in Figure 6 in the present embodiment, the 5V DC voltage obtained supplying the voltage of single-chip microcomputer operate as normal through voltage stabilizing output.
In the present embodiment, input block 6 is made up of single-pole double-throw switch (SPDT) SW and button SW3～SW7.Two optional terminals of single-pole double-throw switch (SPDT) SW link to each other with external pin IOB2, the IOB3 of SPCE061A respectively.When high-voltage power supply is selected the 2000V shelves, simultaneously SW is allocated to IOB2, single-chip microcomputer receives the interrupt request singal of external interrupt 1, carries out corresponding interrupt service routine, and composing the U value is 2000V; In like manner, when high-voltage power supply is selected the 3000V shelves, SW is allocated to IOB3, single-chip microcomputer receives the interrupt request singal of external interrupt 2, carries out corresponding interrupt service routine, and composing the U value is 3000V.When detecting, whether processing unit 3 at first detects IOB2 closed, if IOB2 closure then initialization U value is 2000V otherwise then detects whether closure of IOB3 again, if IOB3 closure then initialization U value is 3000V.Button SW3～SW7 links to each other with external pin IOB5～IOB9 of SPCE061A respectively; Button SW3～SW6 is respectively applied for critical insulation resistance R1 of null value and the critical insulation resistance R2 of low value is carried out the scene setting: when pressing SW3 or SW4; The single-chip microcomputer commentaries on classics goes to carry out corresponding subroutine, gets into the set condition of R1 or R2; Again can R1 through button SW5 (increase) and SW6 (reducing) or R2 be set to suitable numerical value; Button SW7 is used to read the result of storage.According to this principle, can realize more output voltage kind being provided with more taps on the high-voltage power supply unit 1, in processing unit 3, establishing more interruption, to the insulating property detection of more kinds of insulators.
In the present embodiment, storage unit 7 is integrated among the SPCE061A.Stepping on the bar operating personnel can a collection of insulator of disposable detection; Owing on shaft tower, step on bar operating personnel record data then and there sometimes; Therefore the operating personnel can be stored in the result who detects in the storer that carries; Measurement data with storage after measurement finishes shows through display unit 5 or voice-output unit 4 successively, to make things convenient for record.
As shown in Figure 7; Voice-output unit 4 is made up of pronounciation processing chip and voice amplifying circuit; SPCE061A has Audio Processing function able to programme in the present embodiment; Therefore replace special-purpose pronounciation processing chip to carry out Audio Processing by SPCE061A, after SPCE061A carried out Audio Processing, the voice signal of output was exported from loudspeaker after amplifying through the voice amplifying circuit that mainly is made up of LM386.
As shown in Figure 8; Display unit 5 mainly is made up of the LCD display module; The FPDP of display unit 5 links to each other with the IOB0-IOB7 port of SPCE061A; The control port of display unit 5 links to each other with the IOB8-IOB11 port of SPCE061A, and display unit 5 is according to the output of the data of SPCE061A, and the testing result of the tested insulator that calculates is shown.
As shown in Figure 9, the output terminal of high-voltage power supply unit 1 is a socket 11, and socket 11 is connected to the two ends of tested insulator through ST 8.ST 8 is made up of forked probe 81, insulation rod 82, lead 83 and plug 84; Forked probe 81 is fixed in an end of insulation rod 82; The both ends of forked probe 81 are equipped with fork-shaped contact element 811, and fork-shaped contact element 811 is used for contacting with the metal at the two ends of tested insulator.Lead 83 runs through insulation rod 82, lead 83 1 ends and two fork-shaped contact element 811 conductings, and the other end of lead 83 cooperates through the socket 11 of plug 84 and high-voltage power supply unit 1.When practical operation, operating personnel can hand insulation rod 82, with fork-shaped contact element 811 firmly fork with the Metallic rod at the two ends of tested insulator on, can begin tested insulator is detected.
In addition; Processing unit 3 can also be with the form output of the result that tested insulator is detected through data transmission interface cell data document; Wherein the data transmission interface unit can be EBI or network interface, the result that processing unit 3 detects tested insulator through the output of forms such as EBI or network interface.
Claims (3)
1. insulator dielectric performance detection method is characterized in that implementation step is following:
1) the null value critical resistance R1 of the tested insulator of initialization and low value critical resistance R2;
2) the tested insulator under the power down mode is applied dc high voltage;
3) acquisition stream is through the leakage current of tested insulator;
4) according to step 2) leakage current that collects of the dc high voltage that applies and step 3), calculate the insulation resistance R of tested insulator in conjunction with voltammetry;
5) the insulation resistance R and null value critical resistance R1, the low value critical resistance R2 that step 4) are calculated compare, and export the comparative result to the performance of tested insulator then.
2. insulator dielectric performance detection method according to claim 1 is characterized in that: before the output comparative result, comprise the step with said comparative result storage in the said step 5).
3. insulator dielectric performance detection method according to claim 1 and 2 is characterized in that: the output form of the comparative result in the said step 5) is form of sound, visual form or data file form.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100447315A CN101706531B (en) | 2009-11-10 | 2009-11-10 | Method for testing insulation performance of insulator |
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| CN2009100447315A CN101706531B (en) | 2009-11-10 | 2009-11-10 | Method for testing insulation performance of insulator |
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| CN101706531B true CN101706531B (en) | 2012-04-25 |
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Application publication date: 20100512 Assignee: CHANGSHA XINCHANG ELECTRIC POWER SCIENCE & TECHNOLOGY CO., LTD. Assignor: Li Jinglu Contract record no.: 2015430000011 Denomination of invention: Method for testing insulation performance of insulator and device thereof Granted publication date: 20120425 License type: Exclusive License Record date: 20150326 |
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Effective date of registration: 20160930 Address after: 410011 No. 9, No. 188, No. four, 204 Middle East environmental protection road, Yuhua District, Hunan, Changsha Patentee after: CHANGSHA XINCHANG ELECTRIC POWER SCIENCE & TECHNOLOGY CO., LTD. Address before: 410076 School of electrical and information engineering, Changsha University of Science and Technology, Changsha, 45 Ling Ling Road, Hunan, China Patentee before: Li Jinglu |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120425 Termination date: 20181110 |