CN104316852A - Ultraviolet detection method for corona noise caused by corona discharge of ultra-high-voltage transmission and transformation project - Google Patents
Ultraviolet detection method for corona noise caused by corona discharge of ultra-high-voltage transmission and transformation project Download PDFInfo
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Abstract
The invention discloses an ultraviolet detection method for corona noise caused by corona discharge of an ultra-high-voltage transmission and transformation project. The method comprises the following steps of 1 testing audible noise at the tower position; 2 conducting ultraviolet detection on the corona discharge at the tower position; 3 testing audible noise in a transformer substation equipment area; 4 conducting ultraviolet detection on the corona discharge in the transformer substation equipment area. An audible noise direct-measurement method and a corona discharge ultraviolet detection method are combined to determine noise level and the position and location of the noise produced by the corona discharge and find key metal accessories producing the corona noise, and the purpose of reducing the audible noise produced in the transformer substation equipment area and produced by power transmission lines is achieved by starting from source control, design and type selection of equipment.
Description
Technical field
The invention belongs to ehv power transmission technical field, relate to a kind of ehv power transmission engineering corona noise corona and put a ultraviolet detection method.
Background technology
Along with developing rapidly of northwest supergrid, the raising of electric pressure, the impact of electromagnetic environment more and more receives the concern of people, and especially the impact of audible noise on resident living becomes increasingly conspicuous.In recent years, the audible noise of high pressure and extra high voltage network and transformer station's generation has become comparatively distinct issues in engineering environmental protection final acceptance of construction and day-to-day operation, the attention rate of society is more and more higher, and substation operation personnel also reflect that in transformer station, noise produces the problems such as harmful effect comparatively greatly, to working environment.Especially the Northwest builds constantly increases with 330kV, 750kV ehv power transmission engineering in planning construction, in addition the Northwest's height above sea level, weather conditions are severe, equipment hardware corona electric discharge phenomena are more obvious, the impact of audible noise on resident living produced becomes increasingly conspicuous, and the complaint caused and electrical network environmental protection dispute also increase thereupon.Therefore, the research reducing ehv power transmission engineering audible noise gordian technique is carried out particularly necessary.
Summary of the invention
The object of the invention is to the defect overcoming the existence of above-mentioned technology, a kind of ehv power transmission engineering corona noise corona is provided to put a ultraviolet detection method, the audible noise direct method of measurement and corona discharge uv detection method are combined, determine the size of noise, specify position and position that corona discharge produces noise, find out the crucial gold utensil producing corona noise, from Sources controlling, set about from design, lectotype selection, to reach the object of the audible noise reducing substation equipment district and transmission line of electricity generation.Its concrete technical scheme is:
A kind of ehv power transmission engineering corona noise corona puts a ultraviolet detection method, comprises the following steps:
The audible noise test of step 1 tower position place
Select typical 750kV, 330kV iron tower of power transmission line to carry out the audible noise test at tower position place, be specially:
(1) point layout: under being selected in limit, horizontal path direction phase conductor, 0m starts measurement of layouting.
Angle tower is selected being less than 180 degree of side interior angles, and along corner center line, under lower wire jumper, 0m starts measurement of layouting.Point layout is 0m, 5m, 10m, 15m, 20m, 30m, 40m, 50m, 60m;
In addition, select steel tower to be greater than 180 degree of side (exterior angle) places and measure, method is the same;
(2) measure the item: third-octave spectrum analysis under 1min equivalent continuous A sound level, limit wire, tangent tower or lower wire jumper, angle tower;
(3) measuring height: microphone is above 1.5m place on ground;
Step 2 tower position place corona discharge UV detection
To 750kV, 330kV electric power line pole tower connection gold utensil carry out ultraviolet imagery observation, search bloom point, method of testing is as follows:
(1) with the difference of detected object position, observation generally can be carried out in 5 ~ 50 meters of distances, and minor increment should be selected as far as possible to obtain good Detection results, obtains the accurate recording of highest detection sensitivity and insulator surface partial discharge position;
(2) behind observation tower position, switch on power and use ultraviolet imaging instrument to aim at object, focused by automatic or manual mode, detected equipment drawing picture is made to reach utmost sharpness, the position that corona discharge may occur field apparatus is observed, to determine that instrument can effectively detect equipment corona discharge;
(3) select suitable instrument signal gain, threshold value and filter parameter, make instrument can carry out the detection of scanning on a large scale under higher sensitivity and effectively can eliminate the impact of external interference signal;
(4) under the prerequisite can getting rid of the interference of background irrelevant signal, comparatively high detection sensitivity should be selected as far as possible to detect, after finding point of discharge, lowering apparatus sensitivity makes accurate location to discharge position;
(5) may be blocked by objects in front due to equipment corona point and cause undetected, generally at least should carry out in relative both direction the detection of same equipment, if desired should suitable shift position in detection, ensure that equipment of observing is whole by inspection position;
Audible noise test in step 3 substation equipment district
Charging equipment place in substation equipment district carries out the measurement of 1min equivalent continuous A sound level; Typical position is selected to carry out the measurement of third-octave noise spectrum and record.
Corona discharge UV detection in step 4 substation equipment district
Corona discharge UV detection is carried out to charging equipment in substation equipment district and gold utensil, searches equipment point of discharge, carry out taking pictures, recording a video and data record, analyze electric discharge reason.
Preferably, 750kV, 330kV iron tower of power transmission line comprises tangent tower, angle tower.
Preferably, connecting gold utensil in step 1 is damper, conductor spacer, suspension string grading ring, strain insulator grading ring, wire jumper, connecting plate, wire clamp, wire, ground wire gap rod.
Preferably, in step 3, charging equipment is main transformer, switch, disconnecting link, isolating switch.
Preferably, in step 4, charging equipment is wire, bus, wire clamp, grading ring, shading ring, voltage equalizing ball, disconnecting link.
Compared with prior art, beneficial effect of the present invention is:
The present invention is in reality detection and hanging net operation process of the test, set about from corona noise detection and Prevention Technique aspect, draw that there is constructive conclusion from aspects such as detection means, the regularity of distribution, verification the verifying results and Prevention Technique, for from now on from Sources controlling corona noise, for lectotype selection, design, installation, operation management and gold utensil optimization improvement etc. provide technological means and reliable basis.Beneficial effect is as follows:
(1) propose under same operating condition and same environmental conditions, the method that employing ultraviolet imagery detects and audible noise synchronously detects, to detect the corona noise of ehv power transmission engineering, provides technological means for reducing corona noise;
(2) corona noise synchronization detection method generaI investigation Gansu typical case's ehv power transmission engineering corona noise situation is adopted, analyze and grasp the regularity of distribution of corona noise, and correlation analysis is carried out to hardware corona electric discharge and audible noise, find to there is certain positive correlation therebetween.
(3) by selecting the extra high voltage network of Different Altitude Regions, multi-form steel tower (angle tower and tangent tower) is selected to carry out changing the gold utensil after optimizing improvement, and the contrast that it carries out changing front and back is detected, the noise reduction of checking gold utensil optimization improvement and science.
(4) extra-high tension unit safety defect and error can be found by corona noise synchronization detection method, and propose in time to remedy and operation management measure; Propose the countermeasures reducing ehv power transmission engineering corona noise simultaneously, especially verified from gold utensil Optimizing Reconstruction aspect.
Embodiment
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, setting forth the present invention further below in conjunction with instantiation.
At present, the corona noise meat ear that ehv power transmission engineering produces can obviously distinguish, but cannot distinguish the gold utensil and gold utensil point of discharge that produce corona noise.This Project of Denoising utilizes the audible noise of AWA6270+ noise-measuring instrument to 330kV, 750kV typical case's transmission line of electricity and 330kV, 750kV substation equipment district directly to measure, and spectrum analysis is carried out in reconnaissance; Meanwhile, the different hardware corona discharge scenario of CoroCAM504 ultraviolet imager to same line, equipment are adopted to carry out shooting record.The two synchronous detection, binding analysis, finds the crucial gold utensil and gold utensil point of discharge that produce corona noise, from Sources controlling, reaches the object of energy-saving and noise-reducing; Set about from design, lectotype selection, the final impact reducing project of transmitting and converting electricity and produce ambient sound environment, improves foundation and test basis for optimization gold utensil and lectotype selection from now on, transport, installation and operational management provide further.
Gansu Electric Power Research Institute successively becomes 750kV silver, the ancient wave of 330kV becomes, 330kV Shuan Wan substation equipment district and 4 base 750kV steel tower (3 base angle towers, 1 base tangent tower) and 10 base 330kV iron tower of power transmission line (3 base tangent towers, 7 base angle towers) carry out audible noise and ultraviolet imagery detection, before replacing improvement gold utensil being carried out to the steel tower of typical 330kV transmission line of electricity Different Altitude Regions simultaneously, change the audible noise after improvement gold utensil and ultraviolet imagery detection, and work out test report, test data and associated picture data provide foundation and reference for the transformation of gold utensil optimal design, for lectotype selection, design, installation and operational management provide referential suggestion, through the gold utensil of Optimizing Reconstruction, there is certain directive significance to promoting from now on.Now test result is gathered as follows:
1 substation equipment district noise and UV detect result
1.1 walkaway results
Table 1 750kV silver becomes, the ancient wave of 330kV becomes and 330kV two change battery limits, gulf noise result statistical form
Unit: dB (A)
Conclusion: the electromagnetic noise that in transformer station, noise produces when mainly transformer, reactor run and mechanical noise.Noise in Ultra-high Voltage Substations battery limits under charged framework is much smaller than main-transformer and reactor noise, but its measurement result can be subject to the impact of main-transformer and reactor noise.Meanwhile, the audible noise in GIS substation equipment district is far below non-GIS transformer station.
1.2 UV detect results
(1) 750kV silver transformer station
The main portions that 750kV silver transformer station 330kV and 750kV high voltage electric equipment corona discharge situation carry out ultraviolet imagery inspection is the part of appliance such as wire, gold utensil, disconnecting link, switch, voltage transformer (VT), current transformer, lightning arrester, insulating supporting during substation section puts into operation.Wherein 330kV battery limits mainly checked II bus and Bai Shi I line station equipment; 750kV battery limits mainly checked II bus and Bai Dong I line station equipment.
750kV battery limits corona point focuses mostly at wire, conductor spacer and connects on gold utensil; 330kV battery limits corona point focuses mostly on and conductor spacer most advanced and sophisticated at gold utensil, wire.
(2) 330kV Shuan Wan transformer station
330kV two gulfs change the 2nd string and the 4th string is selected to detect.Detect and find: II bus B phase main transformer side portal frame tension force string (grading ring, conductor spacer, unknown gold utensil parts) electric discharge; Two beaches I line 33222 disconnecting link B phase disconnecting link column upper section flange periphery, causes surface irregularity to cause electric discharge by antifouling flush paint coagulum; Two beaches I line outgoing line side B phase flexible jumper and the electric discharge of drainage thread conductor spacer; Two beaches I line outgoing line side A, B, C three-phase grading ring connects gold utensil point discharge; Two refined I line 33411 disconnecting link C phase switch-side grounding switch static contact point discharge.All the other equipment (disconnecting link, switch, CT, PT, lightning arrester etc.) are showed no electric discharge phenomena.
(3) 330kV Gu Lang transformer station
According to on-site actual situations, Gu Lang becomes GIS station, and station equipment is less, and carried out complete detection to 330kV battery limits, this station, particular exam situation is as follows:
1. 3088 Gu Liang two wires, 3087 ancient cool lines, 3904 Gu Wu two wires, 3034 ancient military lines 4 are detected back into outgoing line side equipment totally, detection ordering is A (B, C) phase GIS blown jacket → trap → tension force string → PT → lightning arrester (and the soft lead-in wire be connected), and discharge position appears at the mutually soft lead-in wire conductor spacer of A (B, C), trap gold utensil is most advanced and sophisticated, lightning arrester top terminal block is most advanced and sophisticated;
2. equipment between GIS switch to main transformer is detected, detection ordering is GIS side C (B, A) phase blown jacket → suspension insulator → tension force string → PT → lightning arrester → main transformer side tension force string → main transformer (and the soft lead-in wire be connected), discharge position appear at the mutually soft lead-in wire conductor spacer of C (B, A), suspension string lower end grading ring and connect gold utensil, tension force string grading ring and connect gold utensil, by army cap upper end terminal block above main transformer.
2 iron tower of power transmission line noises and ultraviolet test result
Table 2 330kV iron tower of power transmission line noise and UV detect result statistical form
Table 3 750kV iron tower of power transmission line noise and UV detect result statistical form
Conclusion: under identical height above sea level, the audible noise under tangent tower is less than the audible noise under angle tower, and its corona point is few, and main cause is that tangent tower is few compared with angle tower gold utensil.Height above sea level is different, and audible noise size differences is obvious, and height above sea level is higher, and hardware corona point of discharge is more, and the audible noise of generation is larger.Meanwhile, wire is also the key factor affecting audible noise size on ground level.
The typical iron tower of power transmission line noise of 3 replacing gold utensils and UV detect comparative analysis result
The military forever gold utensil that II line 009# anchor support is changed of 330kV be respectively A, B phase small size side grading ring, C phase large small size side grading ring and A phase 008# to 009# tower drainage thread the 4th, 5,6 conductor spacers, totally 4 grading rings and 3 conductor spacers.The gold utensil that 330kV Bai Anyi line 12# tangent tower is changed be in, the connecting plate of lower two-phase, totally 2, at the connecting plate place of upper, middle and lower three-phase, 2 anti-dizziness balls are respectively installed, totally 6.
Before 2 base steel tower hardware fitting replacements, change after noise and UV detect result compare of analysis as follows:
Table 4 330kV force forever II line and 330kV Bai Anyi line steel tower changes the forward and backward noise result contrast table of gold utensil
To not changing 12 grading rings of the force before gold utensil forever on II line No. 9 anchor supports and each mutually soft lead-in wire conductor spacer detects, detect the gold utensil finding to exist point of discharge to have: A phase, B phase, C phase small size side grading ring, C phase large size side grading ring, A phase large, trumpet side near drainage thread conductor spacer between suspension insulator side and two suspension insulators, B phase large small size side drainage thread conductor spacer and C phase small size side drainage thread conductor spacer.Detailed detection has been carried out to the gold utensil after changing.Detect and find: the grading ring after replacing does not find electric discharge phenomena, conductor spacer after replacing is not except between A phase No. 8 tower to 9 towers, wire the 4th conductor spacer has discharge scenario, all the other all have electric discharge phenomena, illustrate that the effect that conductor spacer is changed is undesirable, await carrying out further optimal design and transformation to conductor spacer.
Detect position be mainly suspension insulator bottom grading ring, connecting plate and with wire interconnecting piece position and neighbouring damper, find that circuit damper and suspension insulator bottom grading ring have intermittent discharge phenomenon in detection, and in improved connecting plate and hanging wire position mutually and lower phase only have accidental corona discharge phenomenon, above substantially there is not corona discharge mutually.And be that on November 5th, 2009 is to all there is continuous print corona discharge phenomenon during above-mentioned location detection before replacing gold utensil.
Because 330kV Bai Anyi line 12# tower and Bai An two wires common-tower double-return set up, wire suspension string distance to the ground is higher, is 23.5 meters, and therefore, before and after transformation hardware fitting replacement, audible noise change is little.
4 installation defects detection results
The corona noise that 750kV angle tower medial angle produces in theory is large, it is many that corona puts an electricity, the corona noise that lateral angle produces is little, and find in testing process, certain 750kV angle tower medial angle corona noise is little, and lateral angle corona noise is large, find that exterior angle suspension string is not installed grading ring and caused gold utensil circumferential surface electric field intensity to cause corona discharge greatly through UV detect, and grading ring is installed under interior angle cross hang string, corona point is reduced, thus corona noise is little.Therefore, corona noise detects can find installation defect and omission problem, and then adopts remedial measures in time, to reduce corona noise.
The Preventing Countermeasures of 5 proposition corona noises
This project controls from links such as lectotype selection, design and gold utensil manufacture, packed and transported, installation, operational managements simultaneously, improve Electric Field Distribution, improve discharge inception voltage, final reduction ehv power transmission engineering corona noise, for gold utensil manufacture and design, the selection of pre-anticorona measure and the aspect such as improvement, installation and operation of electric armour clamp provide decision-making and reference frame.Mainly from following several respects, the countermeasure reducing corona noise is proposed:
(1) lectotype selection and design link
Designing unit not only will consider the needs meeting engineering in engineering design process, to consider to select anti-dizzy type gold utensil simultaneously, the grading ring design form broken traditions, the main setting position from grading ring and physical dimension are set about, each position is not omitted in anticorona measure, to reduce corona discharge.
(2) gold utensil production, transport, fixing link
Gold utensil the links such as production, transport, installation wherein any one link go wrong hardware corona all can be caused to discharge, produce corona noise.
In process of production, ensure gold utensil smooth appearance, do not occur corona at normal operating condition, the gold utensil of casting preferably adopts metal die to produce to gold utensil, and machine work face adopts milling machine processing, and outside surface adopts buffing; For ensureing gold utensil anticorona performance, gold utensil will carry out strict packaging protection when dispatching from the factory, and avoids gold utensil to collide with in shipment, rubs, crimp etc.; In installation process, prevent cut and burr, smear protection grease at the gold utensil front surface that dispatches from the factory; After installation except terminal block, gold utensil outside surface all must not have grease, cleans if desired with alcohol; In addition, also need in installation process to prevent its crimp and installation damage, note installing rationally, put in place, ensure not omit.
(3) gold utensil Optimizing Reconstruction link
By gold utensil Optimizing Reconstruction, gold utensil surface electric field intensity can be improved, improve discharge inception voltage, reduce corona noise.
Grading ring is by being optimized its size, radian and caliber etc., and avoid acute angle and most advanced and sophisticated generation, reasonable installation, effectively improves the spread voltage around gold utensil and Electric Field Distribution, reduces the electric field intensity on grading ring and gold utensil surface.
The hard wire jumper of transmission line of electricity, by suitably increasing the radius-of-curvature of wire jumper end suspension clamp or installing anti-dizziness ball at wire jumper end suspension clamp chuck, improves the field strength distribution around it further, improves discharge inception voltage.
Conductor spacer reduces its surface field intensity by its structure of change and size, by adopting embedded design to its coupling bolt, conductor spacer bolt effectively can be avoided to expose long not shielding, cause bolt point discharge; By carrying out polishing to its surface, can effectively avoid conductor spacer rough surface and the corona that produces, thus reduce corona noise.
The above, be only best mode for carrying out the invention, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses, and the simple change of the technical scheme that can obtain apparently or equivalence are replaced and all fallen within the scope of protection of the present invention.
Claims (5)
1. ehv power transmission engineering corona noise corona puts a ultraviolet detection method, it is characterized in that, comprises the following steps:
The audible noise test of step 1 tower position place
Select typical 750kV, 330kV iron tower of power transmission line to carry out the audible noise test at tower position place, be specially:
(1) point layout: under being selected in limit, horizontal path direction phase conductor, 0m starts measurement of layouting;
Angle tower is selected being less than 180 degree of side interior angles, and along corner center line, under lower wire jumper, 0m starts measurement of layouting; Point layout is 0m, 5m, 10m, 15m, 20m, 30m, 40m, 50m, 60m;
In addition, select steel tower to be greater than 180 degree of side (exterior angle) places and measure, method is the same;
(2) measure the item: third-octave spectrum analysis under 1min equivalent continuous A sound level, limit wire, tangent tower or lower wire jumper, angle tower;
(3) measuring height: microphone is above 1.5m place on ground;
Step 2 tower position place corona discharge UV detection
Carry out ultraviolet imagery observation to the connection gold utensil of 750kV, 330kV electric power line pole tower, search bloom point, method of testing is as follows:
(1) with the difference of detected object position, observe and carrying out in 5 ~ 50 meters of distances, select minor increment to obtain good Detection results, obtain the accurate recording of highest detection sensitivity and insulator surface partial discharge position;
(2) behind observation tower position, switch on power and use ultraviolet imaging instrument to aim at object, focused by automatic or manual mode, detected equipment drawing picture is made to reach utmost sharpness, the position of field apparatus generation corona discharge is observed, to determine that instrument can effectively detect equipment corona discharge;
(3) select suitable instrument signal gain, threshold value and filter parameter, make instrument can carry out the detection of scanning on a large scale under higher sensitivity and effectively can eliminate the impact of external interference signal;
(4) select comparatively high detection sensitivity to detect, after finding point of discharge, lowering apparatus sensitivity makes accurate location to discharge position;
(5) at least should carry out in relative both direction the detection of same equipment, if desired should suitable shift position in detection, ensure that equipment of observing is whole by inspection position;
Audible noise test in step 3 substation equipment district
Charging equipment place in substation equipment district carries out the measurement of 1min equivalent continuous A sound level; Typical position is selected to carry out the measurement of third-octave noise spectrum and record;
Corona discharge UV detection in step 4 substation equipment district
Corona discharge UV detection is carried out to charging equipment in substation equipment district and gold utensil, searches equipment point of discharge, carry out taking pictures, recording a video and data record, analyze electric discharge reason.
2. ehv power transmission engineering corona noise corona according to claim 1 puts a ultraviolet detection method, and it is characterized in that, described 750kV, 330kV iron tower of power transmission line comprises tangent tower, angle tower.
3. ehv power transmission engineering corona noise corona according to claim 1 puts a ultraviolet detection method, it is characterized in that, connecting gold utensil in step 1 is damper, conductor spacer, suspension string grading ring, strain insulator grading ring, wire jumper, connecting plate, wire clamp, wire, ground wire gap rod.
4. ehv power transmission engineering corona noise corona according to claim 1 puts a ultraviolet detection method, and it is characterized in that, in step 3, charging equipment is main transformer, switch, disconnecting link, isolating switch.
5. ehv power transmission engineering corona noise corona according to claim 1 puts a ultraviolet detection method, it is characterized in that, in step 4, charging equipment is wire, bus, wire clamp, grading ring, shading ring, voltage equalizing ball, disconnecting link.
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| CN110988772A (en) * | 2019-12-19 | 2020-04-10 | 国网山西省电力公司电力科学研究院 | Check-up comparison circuit of ultraviolet imager |
| CN110988773A (en) * | 2019-12-19 | 2020-04-10 | 国网山西省电力公司电力科学研究院 | Verification comparison method of ultraviolet imager |
| CN111190080A (en) * | 2020-01-07 | 2020-05-22 | 南方电网科学研究院有限责任公司 | High-voltage electrode corona discharge audible noise measuring device, system and method |
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