CN102331542B - Transformer substation local discharging signal online monitoring and positioning method - Google Patents
Transformer substation local discharging signal online monitoring and positioning method Download PDFInfo
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- CN102331542B CN102331542B CN201110167599.4A CN201110167599A CN102331542B CN 102331542 B CN102331542 B CN 102331542B CN 201110167599 A CN201110167599 A CN 201110167599A CN 102331542 B CN102331542 B CN 102331542B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000007599 discharging Methods 0.000 title abstract 9
- 238000001914 filtration Methods 0.000 claims abstract description 16
- 230000004807 localization Effects 0.000 claims description 12
- 230000000737 periodic effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 6
- 238000009413 insulation Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000007405 data analysis Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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Abstract
The invention discloses a transformer substation local discharging signal online monitoring and positioning method. Different from the traditional local discharging monitoring method which only can be used for monitoring one power equipment, the method provided by the invention is used for carrying out online monitoring and positioning on the local discharging signals of all the power equipment in a transformer substation. The method comprises the following steps of: (1) arranging an antenna array close to a central position in a space region of the transformer substation, and receiving an electromagnetic signal in the transformer substation by adopting the antenna array; (2) acquiring electromagnetic wave signals received by all antennae; (3) filtering the acquired electromagnetic wave signals, comparing the filtered electromagnetic wave signals with a standard local discharging signal; if the filtered electromagnetic wave signals are similar to or same with the standard local discharging signal, judging that a local discharging source exists in the substation; and (4) positioning the local discharging source by utilizing time difference of the local discharging signals received by two different antennae.
Description
Technical field
The present invention relates to a kind of electric signal monitoring and localization method, relate in particular to a kind of method for the insulation fault of transformer station is monitored and located.
Background technology
Insulation fault is one of major failure of being in operation of power equipment, before power equipment generation insulation fault, generally all can have a shelf depreciation process for development gradually, and finally cause insulation breakdown.If can carry out partial discharge monitoring and diagnosis to operational outfit in this process, find in time local discharge signal, in advance defect is processed, just can effectively avoid the generation of Fault of Insulating Breakdown.In addition, the location to partial discharge position, also contributes to formulate and overhauls more targetedly processing scheme, reduces power off time, improves overhaul efficiency.
Therefore, lot of domestic and international researcher is all studied the monitoring of the shelf depreciation of power equipment and location at present.Its main thought is single substation equipment, GIS (Gas Insulated Switchgear for example, gas insulated combined electric appliance equipment), the shelf depreciation of the equipment such as transformer, capacitive apparatus detects, and positions according to the acoustical signal and the electric signal that collect.Yet there is following defect in this monitoring and localization method:
1. all may there is partial discharges fault in any high voltage electric power equip ment in transformer station, want full station electrical equipment to implement monitoring, just need on each equipment, partial discharge monitoring device be installed, this need to expend a large amount of time, financial resources are carried out equipment purchase and installation;
2. the test philosophy of each monitoring system, pilot project, accuracy of detection etc. are all not quite similar, and the processing of great number tested data and analysis will directly affect the work efficiency of transformer station personnel;
3. the maintenance and management of numerous monitoring devices also needs to expend a large amount of time and manpower.
Summary of the invention
The object of this invention is to provide a kind of transformer station partial discharge signals on-line monitoring and localization method, the method is different from the existing partial discharge monitoring method for insulation fault judgement and can only monitors for a power equipment, it can be realized for the whole power equipments in whole transformer station and monitoring, and realize location to having there is the power equipment of shelf depreciation, thereby be intended to greatly save equipment configuration cost and human cost, improve overhaul efficiency, reduce as much as possible power off time.
For achieving the above object, the invention provides a kind of transformer station partial discharge signals on-line monitoring and localization method, it is different from existing partial discharge monitoring method and can only monitors for a power equipment, but carry out on-line monitoring and location for the local discharge signal of the whole power equipments in transformer station, the method comprises the following steps:
(1) near the center in the area of space of transformer station, an aerial array is set, adopts this aerial array to receive the electromagnetic wave signal in transformer station, described aerial array comprises N antenna, N=1,2,3 ... m, n; M, n are natural number;
(2) gather the electromagnetic wave signal that each antenna reception arrives;
(3) each electromagnetic wave signal collecting is carried out after filtering, compare with a standard local discharge signal waveform, if the electromagnetic wave signal is after filtering close or identical with standard local discharge signal waveform, think and have Partial Discharge Sources in this transformer station, this Partial Discharge Sources is sent a local discharge signal;
(4) described Partial Discharge Sources is positioned: by comparing the waveform of each electromagnetic wave signal, obtain the mistiming T of the local discharge signal that two different antenna receptions arrive
mn, to set up Partial Discharge Sources positioning equation group:
In formula, c is propagation velocity of electromagnetic wave; g
1, g
2, g
3, g
4... g
m, g
nrepresent respectively first antenna, second antenna, the 3rd antenna, the 4th antenna ... m antenna, n antenna arrives the distance of Partial Discharge Sources,
(X
n, Y
n, Z
n) be the volume coordinate of n antenna; T
12, T
13, T
14... T
mnrepresent respectively first antenna and second antenna, first antenna and the 3rd antenna, first antenna and the 4th antenna ... m antenna and n antenna reception are to the mistiming of same local discharge signal.
Above-mentioned equations simultaneousness, can obtain the volume coordinate (X of Partial Discharge Sources
s, Y
s, Z
s):
Adopt repeatedly simultaneous equations to solve coordinate, obtain some groups of solution (X
s1, Y
s1, Z
s1), (X
s2, Y
s2, Z
s2) ... (X
sn, Y
sn, Z
sn), reject the coordinate figure that deviation strengthens, remaining coordinate figure is averaged, just obtain the coordinate of Partial Discharge Sources, group of equations is as follows:
The solution of above-mentioned equation belongs to known mathematical method, and the technical program does not repeat them here.
In order to guarantee the accuracy of monitoring result, after the electromagnetic wave signal that in described step (2), each antenna reception of collection arrives, by the periodic jamming signals filtering outside the monitoring band limits in each electromagnetic wave signal.Described periodic jamming signals comprises electric system carrier communication and carrier current protection Communication Jamming signal, radio interference signal and satellite communication undesired signal.
Filtering in described step (3) comprises filtering mobile phone undesired signal, short haul connection undesired signal, and rectifier switch device closed and the pulse signal sending while cut-offfing, do not have well-regulated randomness signal and white noise.
Each antenna in described step (1) is wideband omnidirectional antenna, and its frequency range is 0.2GHz-1.5GHz.
The present invention is owing to having adopted above technical scheme, its the whole power equipments that can realize in Dui Yige transformer station are monitored, can detect in this transformer station region and have power equipment shelf depreciation, and quickly and accurately Partial Discharge Sources is positioned, and then be convenient to this power equipment to overhaul rapidly, greatly shortened power off time.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, transformer station partial discharge signals on-line monitoring of the present invention and localization method are described further.
Fig. 1 is the enforcement principle schematic of transformer station partial discharge signals on-line monitoring of the present invention and localization method.
Fig. 2 has shown the electromagnetic wave signal oscillogram that each antenna reception arrives.
Fig. 3 is transformer station partial discharge signals on-line monitoring of the present invention and localization method process flow diagram in one embodiment.
Embodiment
As shown in Figure 1, the volume coordinate of supposing Partial Discharge Sources is (X
s, Y
s, Z
s), each antenna in aerial array also has volume coordinate separately, each antenna 1# in aerial array, 2#, 3#, 4# ... m#, n# all can receive the signal that this Partial Discharge Sources is sent, high-speed data acquistion system gather each antenna reception to signal (as shown in Figure 2) after by each independently data transmission channel be transferred to data analysis and disposal system, data analysis and disposal system are carried out after the processing such as filtering to these signals, once find that there is local discharge signal, just at once Partial Discharge Sources positioned.
As shown in Figure 3, in the present embodiment, adopt following step to carry out on-line monitoring and location to transformer station partial discharge signals:
(1) near the center in the area of space of transformer station, an aerial array is set, adopts this aerial array to receive the electromagnetic wave signal in transformer station, aerial array comprises N ultrahigh frequency broadband omnidirectional antenna antenna (frequency range is 0.2GHz-1.5GHz), N=1,2,3 ... m, n; M, n are natural number (as shown in Figure 1);
(2) the high-speed data acquisition unit (bandwidth 1GHz, sampling rate 3GSa/s) that has a plurality of passages gathers the electromagnetic wave signal of each antenna reception;
(3) adopt low noise amplifier (frequency range 0.5GHz-1.5GHz, gain 30dB) each electromagnetic wave signal gathering is amplified, then adopt the filtering of bandpass filter (0.5GHz-1.5GHz) hardware to comprise electric system carrier communication and carrier current protection Communication Jamming signal, radio interference signal and satellite communication undesired signal are in interior undesired signal;
(4) adopt digital filter system further to remove the mobile phone undesired signal in each electromagnetic wave signal, short haul connection undesired signal, rectifier switch device closed and the pulse signal sending while cut-offfing, do not have well-regulated randomness signal and white noise;
(5) each electromagnetic wave signal after hardware filtering and digital filtering is compared with standard local discharge signal waveform respectively: if the electromagnetic wave signal is after filtering close with standard local discharge signal waveform or identical, think and have Partial Discharge Sources in this transformer station, this Partial Discharge Sources is sent a local discharge signal, carries out step (6); If larger with standard local discharge signal different wave shape, proceed monitoring;
(6) Partial Discharge Sources is positioned to (referring to Fig. 1) simultaneously: by comparing the waveform of each electromagnetic wave signal, obtain the mistiming T of the local discharge signal that two different antenna receptions arrive
mn(T
12, T
13,
T
12＝|T
2-T
1|
T
13＝|T
3-T
1|
T
14＝|T
4-T
1|
T
23＝|T
3-T
2|
T
24＝|T
4-T
2|
T
34＝|T
4-T
3|
T
mn＝|T
m-T
n|
T
14... T
mnrepresent respectively 1# antenna and 2# antenna, 1# antenna and 3# antenna, 1# antenna and 4# antenna ... m# antenna and n# antenna reception are to the mistiming of same local discharge signal):
Set up Partial Discharge Sources positioning equation group:
In formula, c is propagation velocity of electromagnetic wave; g
1, g
2, g
3, g
4... g
m, g
nrepresent respectively 1# antenna (X
1, Y
1, Z
1), 2# antenna (X
2, Y
2, Z
2), 3# antenna (X
3, Y
3, Z
3), 4# antenna (X
4, Y
4, Z
4) ... m# antenna (X
m, Y
m, Z
m), n# antenna (X
s, Y
s, Z
s) to Partial Discharge Sources (X
s, Y
s, Z
s) distance,
T
12, T
13, T
14... T
mnrepresent respectively first antenna and second antenna, first antenna and the 3rd antenna, first antenna and the 4th antenna ... m antenna and n antenna reception are to the mistiming of same local discharge signal;
Adopt repeatedly simultaneous equations to solve coordinate, obtain some groups of solution (X
s1, Y
s1, Z
s1), (X
s2, Y
s2, Z
s2) ... (X
sn, Y
sn, Z
sn), reject the coordinate figure that deviation strengthens, remaining coordinate figure is averaged, just obtain the coordinate (X of Partial Discharge Sources
s, Y
s, Z
s), group of equations is as follows:
Determined the coordinate (X of Partial Discharge Sources
s, Y
s, Z
s) completed the location to Partial Discharge Sources.
Be noted that above enumerate only for specific embodiments of the invention, obviously the invention is not restricted to above embodiment, have many similar variations thereupon.If all distortion that those skilled in the art directly derives or associates from content disclosed by the invention, all should belong to protection scope of the present invention.
Claims (4)
1. transformer station partial discharge signals on-line monitoring and a localization method, its local discharge signal for the whole power equipments in transformer station carries out on-line monitoring and location, it is characterized in that, comprises the following steps:
(1) near the center in the area of space of transformer station, an aerial array is set, adopts this aerial array to receive the electromagnetic wave signal in transformer station, described aerial array comprises N antenna, N=1,2,3 ... m, n;
(2) gather the electromagnetic wave signal that each antenna reception arrives;
(3) each electromagnetic wave signal collecting is carried out after filtering, compare with a standard local discharge signal waveform, if the electromagnetic wave signal is after filtering close or identical with standard local discharge signal waveform, think and have Partial Discharge Sources in this transformer station, this Partial Discharge Sources is sent a local discharge signal;
(4) Partial Discharge Sources is positioned: by comparing the waveform of each electromagnetic wave signal, obtain the mistiming T of the local discharge signal that two different antenna receptions arrive
mn, to set up Partial Discharge Sources positioning equation group, obtain the volume coordinate (X of Partial Discharge Sources
s, Y
s, Z
s):
In formula, c is propagation velocity of electromagnetic wave; g
1, g
2, g
3, g
4g
m, g
nrepresent respectively first antenna, second antenna, the 3rd antenna, the 4th antenna ... m antenna, n antenna arrives the distance of Partial Discharge Sources,
(X
n, Y
n, Z
n) be the volume coordinate of n antenna; T
12, T
13, T
14t
mnrepresent respectively first antenna and second antenna, first antenna and the 3rd antenna, first antenna and the 4th antenna ... m antenna and n antenna reception are to the mistiming of same local discharge signal.
2. transformer station partial discharge signals on-line monitoring as claimed in claim 1 and localization method, it is characterized in that, after the electromagnetic wave signal that in described step (2), each antenna reception of collection arrives, by the periodic jamming signals filtering outside the monitoring band limits in each electromagnetic wave signal.
3. transformer station partial discharge signals on-line monitoring as claimed in claim 1 or 2 and localization method, it is characterized in that, filtering in described step (3) comprises filtering mobile phone undesired signal, short haul connection undesired signal, rectifier switch device closed and the pulse signal sending while cut-offfing, do not have well-regulated randomness signal and white noise.
4. transformer station partial discharge signals on-line monitoring as claimed in claim 1 and localization method, is characterized in that, each antenna in described step (1) is wideband omnidirectional antenna, and its frequency range is 0.2GHz-1.5GHz.
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| CN201110167599.4A CN102331542B (en) | 2011-06-21 | 2011-06-21 | Transformer substation local discharging signal online monitoring and positioning method |
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| CN201110167599.4A CN102331542B (en) | 2011-06-21 | 2011-06-21 | Transformer substation local discharging signal online monitoring and positioning method |
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| CN102331542B true CN102331542B (en) | 2014-01-22 |
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| CN103592584B (en) * | 2013-11-19 | 2016-02-10 | 国家电网公司 | A kind of transformer station's discharge source localization method based on Electromagnetic Wave Detection |
| CN103823164A (en) * | 2014-01-15 | 2014-05-28 | 云南电力试验研究院（集团）有限公司电力研究院 | Ultra-high frequency non-contact partial discharge positioning detecting device and positioning algorithm |
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| CN105004977A (en) * | 2015-07-26 | 2015-10-28 | 胡洁维 | Transformer substation partial discharge signal detection system |
| CN105067969A (en) * | 2015-07-26 | 2015-11-18 | 胡洁维 | Power station partial discharge signal detection system |
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| CN105021964B (en) * | 2015-08-25 | 2016-10-05 | 广东万邦仪器股份有限公司 | A kind of transformer station partial discharge signals detecting system |
| CN105223480B (en) * | 2015-10-22 | 2018-01-19 | 西安交通大学 | The Positioning Error Simulation method of aerial array time difference method positioning transformer station Partial Discharge Sources |
| CN107271860B (en) * | 2017-06-09 | 2019-09-24 | 北京兴迪仪器有限责任公司 | A kind of partial discharge pulse's wave-form similarity recognition methods |
| CN107817425B (en) * | 2017-10-11 | 2024-01-16 | 国网辽宁省电力有限公司电力科学研究院 | Identification method and detection system for true and false discharge source of power transmission line |
| CN108169631A (en) * | 2017-11-09 | 2018-06-15 | 全球能源互联网研究院有限公司 | The bearing calibration of shelf depreciation position error, system, terminal and readable storage medium storing program for executing |
| CN109521336B (en) * | 2018-11-23 | 2021-11-26 | 重庆大学 | Automatic monitoring and positioning method and system for partial discharge of transformer substation based on inspection robot |
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