CN1274848A - Detection instrument of ceramic quality of insulator string for AC transmission line - Google Patents
Detection instrument of ceramic quality of insulator string for AC transmission line Download PDFInfo
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- CN1274848A CN1274848A CN 00116694 CN00116694A CN1274848A CN 1274848 A CN1274848 A CN 1274848A CN 00116694 CN00116694 CN 00116694 CN 00116694 A CN00116694 A CN 00116694A CN 1274848 A CN1274848 A CN 1274848A
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Abstract
By comparing the distribution voltage, industry-frequency current and interior discharge pulse of insulators in three phase of AC transmission line, it is judged whether there is bad insulator string or not. By means of the RC voltage divider comprising high-voltage capacitor constituted by the insulating material, outer electrode and outer electrode and voltage-dividing resistor, high-voltage signal is changed into low-voltage signal in measuring distribution voltage. A sample resistor connected parallelly to the earthing end of insulator is used in measuring industry-frequency current and current pulse with the detected data being displayed directly. The detection of insulators in string makes the detection simple.
Description
The present invention relates to a kind of detection instrument of ceramic quality of insulator string for AC transmission line, be used for the aging detection of electric power system alternating current circuit porcelain insulator, belong to electrical equipment technical field.
It is line insulator that maximum power equipments is used in electric system, and insulator is in operation and can damages, and loses insulating property, thereby causes pollution flashover, accident such as go offline, and loss greatly.Therefore, must in time detect the insulator of damage.The most of mode that adopts porcelain insulator sheet series connection bunchiness in transmission line of alternation current to be to guarantee enough insulation distances, 110kV circuit for example, and every string has 7-9 sheet insulator, the 220kV circuit, every string has 14-17 sheet insulator, and 500kV circuit, every string have 28-35 sheet insulator.Though porcelain insulator has century-old operating experience, detection method is continually developed, and also rests on the level that detects piecewise on shaft tower so far, and workload is very big.Detecting poor insulator does not on the ground have the method for solution so far.
Most widely used method is the voltage distribution at present, as domestic short circuit fork or the sparking distance method of generally using, the instrument of many direct measuring voltages distributions is also arranged, distribute by measuring voltage and detect poor insulator, the method will detect insulator piecewise, and workload is very big.Even some unit such as Japan, Jiangyin, Jiangsu power supply administration of China has developed the self-crawling type measuring instrument, and workload is still very big, and the instrument heaviness, and poor reliability does not obtain practical application.
Document " feasibility analysis that the deterioration insualtor detector is applied in my office " (" Qinghai electric power " the 1998, the 3rd phase, P46～50) three kinds of instruments of Jie Shaoing, the sparking distance pick-up unit, optical fiber voice reporting numerical expression spread voltage tester and intelligent sound formula deterioration insulator detector all are the characteristics of utilizing the poor insulator spread voltage to descend.The sparking distance pick-up unit utilizes the relation of sparking distance sparking voltage and clearance distance to reflect the spread voltage of insulator; Optical fiber voice reporting numerical expression utilizes electrooptical effect, and light intensity has corresponding relation with voltage, detects spread voltage by photoelectric tube.Intelligent sound formula deterioration insulator detector utilizes the voltage divider principle, adopts Single Chip Microcomputer (SCM) system, voltage is distributed broadcast with voice.The method loss is low, practicality, but need to detect piecewise, the testing amount is big, because do not have poor insulator on most of insulator chain, the method causes a large amount of useless workloads.
The objective of the invention is to above-mentioned deficiency at prior art, design provides a kind of new method, can be by the relatively rising of the earth terminal insulator spread voltage of transmission line of electricity A, B, C three phase isolated, the insulator chain power current raises and which insulator chain the pulse of insulator internal discharge judges comprehensively on that poor insulator is arranged, can detect poor insulator with traditional method more then, realize detecting, reduce workload by string.
Rationale of the present invention is: if on 1 insulator chain poor insulator is arranged, because the voltage that poor insulator self is born seriously descends, cause the change that insulator chain voltage distributes, promptly cause other insulator spread voltage to raise, earth terminal insulator spread voltage also raises.2, the poor insulation insulating sublayer descends, and the reactance of bunch of insulator is reduced, and the insulator chain power current increases.3, the inner electric discharge phenomena in addition of some poor insulator are superimposed with discharge pulse on electric current.Because the occupancy volume of poor insulator is very low, three-phase has the probability of poor insulator simultaneously near zero, so, can be by the relatively rising of the earth terminal insulator spread voltage of A, B, C three phase isolated, the insulator chain power current raises and which insulator chain the pulse of insulator internal discharge judges comprehensively on that poor insulator is arranged.Adopting said method only has the poor insulation period of the day from 11 p.m. to 1 a.m on insulator chain, just detect piecewise, has saved the testing amount greatly.
For realizing such purpose, the present invention is in technical scheme, by on insulator, placing electrode in high-voltage capacitance external electrode and the high-voltage capacitance, constitute the high-voltage capacitance that earth terminal insulator spread voltage is measured, and be linked to be voltage divider with divider resistance, high-voltage signal is become low voltage signal measure spread voltage; Be connected in parallel on power taking stream signal on the insulator of earth terminal with sample resistance, and be enclosed within on the earth terminal porcelain insulator surface, with the short circuit surface leakage current with the ground connection conductive copper.Current signal one tunnel is input to low-pass amplifier, draws power current, and one the tunnel is input to band-pass filter amplifier, draws the discharge pulse characteristic.The data that measure can show by LCD display.
The data that measure can also be input to palm PC and keep, and provide the conclusion whether poor insulator is arranged with analysis software.If judge certain poor insulator is arranged mutually, then detect this poor insulator with the measuring voltage distribution instrument that carries again.
Below by accompanying drawing technical scheme of the present invention is further described.
Accompanying drawing 1 is a structural representation of the present invention.
As shown in the figure, electrode 2 is fixed on the insulator 8 in high-voltage capacitance external electrode 1 and the high-voltage capacitance, and constitutes the high-voltage capacitance that earth terminal insulator spread voltage is measured with insulator 8.The divider resistance R3 of high-voltage capacitance series connection is therewith arranged on the circuit board 13, be linked to be voltage divider by spread voltage signal lead 6 and high-voltage capacitance.Probe 3 is fixed together with high-voltage capacitance external electrode 1 in the measurement, probe 18 links with the aluminium shell 16 of ground connection under measuring, two probes are used for contacting the gold utensil up and down of the insulator of surveying, and the spread voltage signal of insulator is input to circuit by above-mentioned voltage divider handles.It is on the probe, firm about high-strength permanent magnet 4 and 20 is fixed on to guarantee contact.
Like this, by this structure, just earth terminal insulator spread voltage is measured, and on liquid crystal display gauge outfit 15, demonstrated the spread voltage value.
After measuring spread voltage, current signal line hook 10 is suspended to measure by current signal line via hole 11 and goes up on the probe 3, and current signal is incorporated in the attachment plug 12, makes current signal be input to circuit board 13 by attachment plug.The sample resistance R8 that the number of winning the confidence is arranged on the circuit board, this resistance one end are by aluminium shell 14 ground connection, and the other end is connected to measure by current signal line hook 10 goes up probe 3, handles thereby the electric current of insulator chain is incorporated into circuit board.
Signal after treatment is input to display gauge head 15 by circuit board through display gauge head lead-in wire 17 and shows.
Ground connection conductive copper 19 is made up of two semicircular ring, and the upper surface that is stuck in insulator when measuring electric current falls the most surfaces leakage current near the gold utensil place in order to short circuit, reduces surface leakage current to measuring the influence of sensitivity.The flexible cord 22 assurance ground connection copper rings that connect copper ring can be put in place.
Whole measuring process is operated by the hand-held insulating bar 21 of operating personnel.
Accompanying drawing 2 is processing of the present invention, display circuit figure.
Among the figure, adjustable resistance R3 and high-voltage capacitance composition voltage divider shown in Figure 1 become low-voltage signal VIN to the spread voltage of being surveyed.Be input to by operational amplifier U1A, R4, R1, C1, D1, filtering, precise rectification circuit that D5 constitutes become direct current to power current, the R5 of back, C3, R6, C4 are the two-stage passive filters, eliminate the ripple on the direct current.Direct current signal is sent to liquid crystal display gauge outfit LCD by selector switch SW1, demonstrates the spread voltage value on LCD.Resistance R 3 is adjustable, is used for adjusting intrinsic standoff ratio, makes the LCD result displayed consistent with spread voltage.R2, C2 eliminates various high-frequency interferencing signals for the low pass passive filter, and D2, D3 are protecting diode, guarantee the forward voltage of input terminal voltage less than diode, about 0.7V.D4 is TVS, is used to eliminate undesired signal fast.
Current signal is imported from IIN, and one the tunnel is input to by operational amplifier U1B, R9, and R7, C5, D9, filtering, precise rectification circuit that D10 constitutes become direct current to spread voltage, the R11 of back, C8, R12, C9 are the two-stage passive filters, eliminate the ripple on the direct current.Direct current signal is sent to liquid crystal display gauge outfit LCD by selector switch SW1, demonstrates current value on LCD.Resistance R 8 is adjustable, is used for adjusting the input signal size, makes the LCD result displayed consistent with electric current.D6, D7 are protecting diode, guarantee the forward voltage of input terminal voltage less than diode, about 0.7V.D8 is TVS, is used to eliminate undesired signal fast.
Another road is input to by operational amplifier U1C, C6, and C7, R10, R13, the bandpass filter that R14 forms filters power frequency component and high-frequency corona, radio interference.If there is discharge poor insulator inside, then the internal discharge pulse is exported a set of pulses through this band-pass filter amplifier.This pulse is input to U1D, R15, and the comparer that D11 forms is further removed some little interference, and is made pulse become square-wave signal.This square-wave signal is counted by impulse meter COUNTER, and delivers to the LCD demonstration by switch SW 1.
The data of measuring can be input to palm PC and keep, and provide the conclusion whether poor insulator is arranged with analysis software.
The present invention has adopted rational structure and method, uses RC divider to measure spread voltage, uses sample resistance to measure power current and current impulse, and is very practical reliable.The instrument overall weight is light, and is easy to operate, owing to realized detecting by string, reduced the testing amount greatly.
The present invention is used for 25 poor insulator simulation 110KV circuits that experimental study is provided to Shandong Electric Power Group and detects, and can all detect.
Claims (2)
1, a kind of detection instrument of ceramic quality of insulator string for AC transmission line, it is characterized in that high-voltage capacitance external electrode (1), interior electrode (2) is fixed on the insulator (8), and constitute the high-voltage capacitance that earth terminal insulator spread voltage is measured with it, the divider resistance R3 of high-voltage capacitance series connection therewith, be linked to be voltage divider by spread voltage signal lead (6) and high-voltage capacitance, probe in the measurement (3) is fixed together with high-voltage capacitance external electrode (1), probe (18) links with the aluminium shell (16) of ground connection under measuring, high-strength permanent magnet (4) and (20) are fixed on up and down on the probe, battery (5) places in the insulator (8), give circuit board (13) power supply by battery lead (9), insulator (8) inwall has screen layer (7), current signal line hook (10) is by current signal line via hole (11), the sample resistance R8 of attachment plug (12) connecting circuit plate (13), this resistance one end is by aluminium shell (14) ground connection, the other end is connected to measure by current signal line hook (10) goes up probe (3), circuit board (13) is connected to display gauge head (15) by display gauge head lead-in wire (17), and ground connection aluminium shell (16) is connected with ground connection conductive copper (19) by flexible cord (22).
2, as the said detection instrument of ceramic quality of insulator string for AC transmission line of claim 1, it is characterized in that said screen layer (7) is a double layer screen, one deck is an aluminum barrel, one deck is an Alperm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00116694 CN1119666C (en) | 2000-06-22 | 2000-06-22 | Detection instrument of ceramic quality of insulator string for AC transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00116694 CN1119666C (en) | 2000-06-22 | 2000-06-22 | Detection instrument of ceramic quality of insulator string for AC transmission line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1274848A true CN1274848A (en) | 2000-11-29 |
| CN1119666C CN1119666C (en) | 2003-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00116694 Expired - Fee Related CN1119666C (en) | 2000-06-22 | 2000-06-22 | Detection instrument of ceramic quality of insulator string for AC transmission line |
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| CN (1) | CN1119666C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100416283C (en) * | 2005-04-08 | 2008-09-03 | 华北电力大学（北京） | Insulator charged detection instrument and its implement method |
| CN101487866B (en) * | 2008-11-06 | 2010-12-08 | 姚建刚 | On-line detection method for AC power transmission line porcelain zero resistance insulator based on infrared thermal imaging |
| CN102866314A (en) * | 2012-09-10 | 2013-01-09 | 山东电力集团公司聊城供电公司 | Method for online detecting unfavorable insulator of power transmission circuit |
| CN102967805A (en) * | 2012-11-06 | 2013-03-13 | 南京能新电力高科实业有限公司 | Analysis meter and analysis method for online induction pulse signal of electric transmission line |
| CN110739708A (en) * | 2019-12-04 | 2020-01-31 | 国网青海省电力公司电力科学研究院 | compensation device for air load and temperature rise test system of +/-800 kV power transmission and transformation main equipment |
-
2000
- 2000-06-22 CN CN 00116694 patent/CN1119666C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100416283C (en) * | 2005-04-08 | 2008-09-03 | 华北电力大学（北京） | Insulator charged detection instrument and its implement method |
| CN101487866B (en) * | 2008-11-06 | 2010-12-08 | 姚建刚 | On-line detection method for AC power transmission line porcelain zero resistance insulator based on infrared thermal imaging |
| CN102866314A (en) * | 2012-09-10 | 2013-01-09 | 山东电力集团公司聊城供电公司 | Method for online detecting unfavorable insulator of power transmission circuit |
| CN102967805A (en) * | 2012-11-06 | 2013-03-13 | 南京能新电力高科实业有限公司 | Analysis meter and analysis method for online induction pulse signal of electric transmission line |
| CN110739708A (en) * | 2019-12-04 | 2020-01-31 | 国网青海省电力公司电力科学研究院 | compensation device for air load and temperature rise test system of +/-800 kV power transmission and transformation main equipment |
| CN110739708B (en) * | 2019-12-04 | 2023-03-21 | 国网青海省电力公司电力科学研究院 | Compensation device for +/-800 kV power transmission and transformation main equipment air load and temperature rise test system |
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| Publication number | Publication date |
|---|---|
| CN1119666C (en) | 2003-08-27 |
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