CN102879718B - Wired-loop-based entire-station monitoring and positioning system and positioning method for partial discharge - Google Patents
Wired-loop-based entire-station monitoring and positioning system and positioning method for partial discharge Download PDFInfo
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- CN102879718B CN102879718B CN201210379321.8A CN201210379321A CN102879718B CN 102879718 B CN102879718 B CN 102879718B CN 201210379321 A CN201210379321 A CN 201210379321A CN 102879718 B CN102879718 B CN 102879718B
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Abstract
The invention discloses a wired-loop-based entire-station monitoring and positioning system for the partial discharge of a transformer substation. The system comprises a high-frequency signal shielding bus. The two ends of the high-frequency signal shielding bus are connected to a dual-channel data acquisition and control unit respectively. N sensing terminals are connected in parallel with the high-frequency signal shielding bus through a three-way connecting piece. The system has the characteristics of high sensitivity and high anti-interference capability in terms of partial discharge detection, and the partial discharge of a plurality of pieces of power equipment of the transformer substation is synchronously monitored, so that the online monitoring cost of the partial discharge of the equipment of the transformer substation is greatly lowered, the mounting and use of online partial discharge monitoring equipment for a plurality of transformer substations is facilitated, shortcomings can be discovered in advance, power failure accidents are reduced, and the intellectualization level of the transformer substation is improved.
Description
Technical field
The present invention relates to a kind of signal monitoring and field of locating technology, particularly relate to measurement and positioning system and the localization method thereof of a kind of partial discharge pulse signal, can be used for transformer station and entirely to stand the synchronous on-line monitoring of shelf depreciation of power equipment.
Background technology
Partial Discharge Detection as the important means of insulation diagnosis, because it can reflect the insulation status of electric system electrical equipment, timely and effectively just by power department is popularized.
Substantially all at present both at home and abroad the research carrying out partial discharge monitoring and monitoring technology for the concrete power equipment of transformer station, the Cleaning Principle of main application and method comprise pulse current method, superfrequency method (UHF), supercritical ultrasonics technology, chemical method, optical method etc., and wherein superfrequency method and supercritical ultrasonics technology are practical feasible methods.
Partial discharge monitoring for substation equipment carries out mainly for the concrete single equipment such as GIS, transformer, capacitive apparatus with location, installs a set of monitoring system separately to the equipment that will monitor.And partial discharges fault all may occur any high voltage electric power equip ment in transformer station, want to implement monitoring to an electrical equipment at full station, just need to install and overlap monitoring device more, then it is carried out comprehensively.Such monitoring system framework, required expense is high, and the service efficiency of monitoring system is also low, and also very large to the maintenance workload of numerous on-Line Monitor Device itself.
Along with development that is economic and society, more and more higher to the requirement of power supply reliability, develop a kind of low cost, high reliability, can realize that real-time state monitoring is carried out to full station high voltage electric equipment, the novel on-Line Monitor Device of location is necessary very much.
At present method for ultrasonic locating, electrical Location method and uhf electromagnetic wave localization method are mainly comprised to the method that the concrete equipment such as GIS, transformer carries out shelf depreciation location.Since the middle and later periods nineties, local discharge superhigh frequency detection technique develops rapidly and in engineering, has progressively played positive effect, achieves a large amount of achievements.The ultimate principle of ultrahigh frequency localization method is the mistiming adopting uhf sensor to receive same discharge source uhf electromagnetic wave signal, then positions according to these time differences and electromagnetic wave propagation speed.
Use the method to detect or monitoring power equipment shelf depreciation, online monitoring equipment two kinds of modes are patrolled and examined and installed to the general portable equipment that adopts.Routine inspection mode has the fixing detection experiment cycle because of it, and can not monitor the overall process that equipment runs, in addition, shelf depreciation live detection is high to survey crew technical requirement, and the scene of patrol officer judges testing result impact larger.PD Online monitoring equipment mainly adopts ultrahigh frequency principle, existing monitoring system structure designs for single power equipment, partial discharge monitoring is carried out for the many power equipments of transformer station, then need to install to overlap on-line monitoring system more, monitoring equipment cost is high, and the maintenance workload of monitoring device self is also large.
Based on electromagnetic wave space location technology, change the Normal practice in the past individual equipment being installed to on-Line Monitor Device, at the solid space at full station, the electromagnetic wave signal that one group of ultra broadband type UHF sensor array received shelf depreciation sends is installed, the time difference of the signal utilizing each sensor to receive, compute location partial discharge position.By set of device, full station equipment is carried out to the monitoring of shelf depreciation, obtain and analyze the discharge scenario of whole substation areas of transformer station.
Because sensor setting distance equipment is comparatively far away, because the aerial decay of signal, this technology is suitable for obvious Partial Discharge Detection.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, there is provided a kind of to monitor and positioning system based on there being transformer station's shelf depreciation of wire loop entirely to stand, ultra high-frequency partial discharge sensor on different power equipment and preposing signal process circuit thereof is arranged on by being connected in parallel on a radioshielding signal bus, two ends of this radioshielding signal bus are connected to a pair of channel data acquisition system, form a loop, be referred to as wire loop.Thus realize a set of partial discharge monitoring system, monitoring substation is stood the object of multiple power equipment entirely, the partial-discharge ultrahigh-frequency rectified signal simultaneously utilizing each sensor to receive is along the two-way propagation of radioshielding signal bus, it arrives mistiming of data acquisition unit and to fix and different separately, thus reaches the object of Primary Location partial discharge position.
Technical solution of the present invention is as follows:
A kind of based on have transformer station's shelf depreciation of wire loop entirely stand monitoring and positioning system, its feature is, comprise a radioshielding signal bus, the two ends of this radioshielding signal bus are connected to a double channel data acquisition and control module respectively, N number of sensing terminal is attempted by this radioshielding signal bus by three-way connector, and N is greater than 1 positive integer being less than 100.
Described sensing terminal comprises the sensor device, superfrequency broad band amplifier, wave detector and the high-frequency signal isolator that connect successively.
Described sensor device is a superfrequency sensor or multiple superfrequency sensor are attempted by an one way signal bus multiple sensor groups by each ultrahigh-frequency signal isolator.
The local discharge signal frequency range that described ultrahigh-frequency signal sensor receives is 500MHz ~ 1.5GHz.
The gain of described superfrequency broad band amplifier is 40dB.
Described wave detector is envelope detection, and time constant is not more than 1 μ s.
The length of described radioshielding signal bus is no more than 1000m, and each sensing terminal is attempted by high-frequency signal bus, and itself and the distance of contact each other on signal bus are not less than 3 meters.
Described in utilization based on there being the shelf depreciation of wire loop entirely to stand monitoring and the localization method of positioning system, it is characterized in that, the method comprises the steps:
1. the detection signal received transmits along radioshielding signal bus to two ends by each sensing terminal, arrives the time t respectively of two passages of data collection and control unit
1iand t
i2;
2. data collection and control unit is according to the time recorded in 1., calculates time difference △ t
i,and with fixing time chart, (detection signal that each sensor receives transmits along radioshielding signal bus to two ends, the mistiming arriving two passages of data collection and control unit is fixed, this fixing time difference arranges into a fixing time chart and is stored in data collection and control unit) contrast, to determine the position of Partial Discharge Sources, time difference computing formula is as follows:
Wherein, △ t
ifor the time difference of local discharge signal arrival data acquisition unit two passages that sensing terminal receives.
The superfrequency method adopted because of the present invention has highly sensitive in detection shelf depreciation, the feature that antijamming capability is strong, add upper sensor and be arranged on (words with good conditionsi near monitored power equipment, built-in sensor can be installed), can low cost, realize transformer station's many power equipments partial discharge monitoring in high sensitivity.Greatly reduce the cost of substation equipment partial discharge monitoring, contribute to more transformer station and install and use partial discharge monitoring equipment, find defect in advance, reduce the generation of power outage, thus improve the intelligent level of transformer station.Compared with prior art, Installation and Debugging of the present invention are simple, realize transformer station's multiple power equipment equipment of entirely standing and carry out synchronous on-line monitoring, can Timeliness coverage insulation defect realize just location, improve equipment security of operation.
Accompanying drawing explanation
Fig. 1 is that the transformer station's shelf depreciation that the present invention is based on wire loop is stood the structural representation of monitoring and positioning system entirely.
Fig. 2 is the topological diagram of sensing terminal in the present invention.
Fig. 3 is shelf depreciation rectified signal time difference schematic diagram calculation.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but should not limit the scope of the invention with this.
Please first consult Fig. 1, Fig. 1 is that the transformer station's shelf depreciation that the present invention is based on wire loop is stood the structural representation of monitoring and positioning system entirely, as shown in the figure, multiple superfrequency sensor 11Si(i=1 ~ n) by three-way connector (ultrahigh-frequency signal N-type three-way connection), be attempted by same radioshielding signal bus 2.The local discharge signal that each sensor detects is all through superfrequency broad band amplifier 12, wave detector 13 and high-frequency signal isolator 14.Two ends of this radioshielding signal bus are connected to a pair of channel data data acquisition and controlling unit 3, form a loop, thus realize a set of partial discharge monitoring and positioning system, monitor the object of multiple power equipment.
Monitoring system structure, as shown in Figure 1, mainly comprises three parts:
Sensing terminal 1: containing superfrequency sensor 11 and superfrequency broad band amplifier 12, wave detector 13, with high-frequency signal isolator 14, ensure signal and be one-way transmission before receiving radioshielding bus ring, namely block the ultrahigh-frequency signal reverse transfer of other sensors coupled to this sensing terminal.
Multiple sensor is installed if necessary for a power equipment, sensor group topological form as shown in Figure 2 can be taked.Multiple superfrequency sensor is attempted by an one way signal bus by each ultrahigh-frequency signal isolator 15.One of them superfrequency sensor of signal bus one termination, an other end is connected to superfrequency broad band amplifier, then by after wave detector and high-frequency signal isolator, whole sensor group is received on signal wired ring radioshielding signal bus.
Radioshielding signal bus 2: for mounting sensing terminal, radioshielding signal bus forms a wire loop, and its two end is connected to a pair of channel data data acquisition and controlling unit 3.
Data collection and control unit 3: the Dual-Channel High-Speed Data Acquisition unit being a tape controller, can data acquisition and rough handling, realizes Partial discharge signal source, location function, can carry out data communication simultaneously with remote monitoring unit.
Monitoring system technical requirement and range of application:
The local discharge signal frequency range that ultrahigh-frequency signal sensor receives is at 500MHz ~ 1.5GHz.
The gain of superfrequency broad band amplifier is 40dB.
Wave detector is envelope detection, and time constant is not more than 1 μ s
Consider that rectified signal transmits along high-frequency signal bus to two ends, bus has certain decay, the length of high-frequency signal bus is no more than 1000m, to ensure that the double channels acquisition card that local discharge signal that each sensor receives propagates into signal bus two ends all has certain amplitude.
Each superfrequency sensor is attempted by high-frequency signal bus, and itself and the distance of contact each other on signal bus are not less than 3m, to ensure that data collecting card can distinguish the time difference of each local discharge signal.At most and the superfrequency sensor connect is no more than 100, i.e. n<101.
Localization method:
As shown in Figure 1, the detection signal that same sensing terminal receives can transmit along signal bus to two ends, because signal velocity is certain, local discharge signal from and contact arrives the different and difference of the line length of data acquisition unit two passages along radioshielding bus transfer fixes, because the time delay propagated has difference, and the time difference is fixed.Namely the time difference △ ti that the local discharge signal that different sensors receives arrives data acquisition unit two passages fixes and different:
If shelf depreciation occurs in the equipment place of installing superfrequency sensor i, partial-discharge ultrahigh-frequency signal can be received by uhf sensor Si, and by radioshielding signal bus to both direction transmission signal.Because path is different, the signal received by uhf sensor Si pass to data collecting card place can exist one obvious time of arrival difference △ t.Meanwhile, the local discharge signal that the uhf sensor at each apparatus assembly place receives is specific and different in difference time of arrival of oscillograph two passage, therefore can determine location defect assembly by this time of arrival of difference, the behavior of monitoring shelf depreciation.
Fig. 3 is shelf depreciation rectified signal time difference schematic diagram calculation, by calculate two passages gather partial discharge pulse's waveform the time difference can calculate this signal and by which sensor accepted, thus navigate to the equipment that shelf depreciation electric discharge occurs.The time difference calculates by calculating the signal collected energy function of each passage, can ask for the initial time of the flex point determination ultrahigh-frequency signal of energy function, thus calculating the time difference of two passages.
Application conditions:
When monitoring system is installed, the access quantity of superfrequency sensor, the interval between each superfrequency sensor can according to substation field environment, sets meeting within the scope of system specifications.For the selection of uhf sensor, built-in uhf sensor can effectively shield all kinds of external electromagnetic interference, when not installing built-in sensor, external superfrequency sensor can be used, eliminate external electromagnetic interference as far as possible, simultaneously because uhf sensor mounting distance equipment is near, good sensitivity can be ensured, improve signal to noise ratio (S/N ratio).
Claims (7)
1. monitor and positioning system based on there being the shelf depreciation of wire loop entirely to stand for one kind, it is characterized in that, comprise a radioshielding signal bus, the two ends of this radioshielding signal bus are connected to a double channel data acquisition and control module respectively, radioshielding signal bus and double channel data acquisition and control module is made to form a signal loop, N number of sensing terminal is attempted by this radioshielding signal bus by three-way connector, and N is greater than 1 positive integer being less than 100.
2. according to claim 1 based on have the shelf depreciation of wire loop entirely stand monitoring and positioning system, it is characterized in that, described sensing terminal comprises the sensor device, superfrequency broad band amplifier, wave detector and the high-frequency signal isolator that connect successively; Described sensor device is multiple superfrequency sensor is attempted by an one way signal bus multiple sensor groups by each ultrahigh-frequency signal isolator.
3. according to claim 2 based on there being the shelf depreciation of wire loop entirely to stand monitoring and positioning system, it is characterized in that, the local discharge signal frequency range that described ultrahigh-frequency signal sensor receives is 500MHz ~ 1.5GHz.
4. according to claim 2 based on have the shelf depreciation of wire loop entirely stand monitoring and positioning system, it is characterized in that, the gain of described superfrequency broad band amplifier is 40dB.
5. according to claim 2 based on have the shelf depreciation of wire loop entirely stand monitoring and positioning system, it is characterized in that, described wave detector is envelope detection, and time constant is not more than 1 μ s.
6. according to arbitrary described the monitoring and positioning system based on there being the shelf depreciation of wire loop entirely to stand of claim 1-5, it is characterized in that, the length of described radioshielding signal bus is no more than 1000m, each sensing terminal is attempted by high-frequency signal bus, and itself and the distance of contact each other on signal bus are not less than 3 meters.
7. utilize described in any one of claim 1-5 based on there being the shelf depreciation of wire loop entirely to stand monitoring and the localization method of positioning system, it is characterized in that, the method comprises the steps:
1. the detection signal received transmits along radioshielding signal bus to two ends by each sensing terminal, arrives the time t respectively of two passages of data collection and control unit
1iand t
i2;
2. data collection and control unit is according to the time recorded in 1., calculates time difference △ t
i, and contrast with fixing time chart, to determine the position of Partial Discharge Sources, time difference computing formula is as follows:
Δt
i＝t
i1-t
i2
Wherein, △ t
ifor the time difference of local discharge signal arrival data acquisition unit two passages that sensing terminal receives.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210379321.8A CN102879718B (en) | 2012-10-09 | 2012-10-09 | Wired-loop-based entire-station monitoring and positioning system and positioning method for partial discharge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210379321.8A CN102879718B (en) | 2012-10-09 | 2012-10-09 | Wired-loop-based entire-station monitoring and positioning system and positioning method for partial discharge |
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| CN102879718B true CN102879718B (en) | 2015-05-06 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102901912B (en) * | 2012-10-10 | 2015-07-01 | 国家电网公司 | Local discharge monitoring method for multiple intensively arranged power equipment |
| CN103616624B (en) * | 2013-12-13 | 2016-06-01 | 国家电网公司 | A kind of partial discharge monitoring system |
| CN103713241B (en) * | 2013-12-13 | 2019-04-05 | 胡岳 | Partial discharge monitoring System and method for based on M-BUS |
| CN103884956A (en) * | 2014-03-25 | 2014-06-25 | 上海局放软件技术有限公司 | Device and method for positioning partial discharge of high-voltage equipment through oscilloscope |
| CN104007374B (en) * | 2014-06-03 | 2017-01-18 | 华北电力大学 | Method for resisting interference signals in converter transformer partial discharge detection experiment |
| CN109782139B (en) * | 2018-12-25 | 2020-07-28 | 西安交通大学 | GIS ultrahigh frequency partial discharge online monitoring system and monitoring method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101865969B (en) * | 2010-05-26 | 2012-05-30 | 四川电力试验研究院 | Method for on-line monitoring and positioning of partial discharge of gas insulation combined electrical apparatus |
| CN201788255U (en) * | 2010-08-19 | 2011-04-06 | 河南省电力公司郑州供电公司 | Partial discharge ultra-high frequency online detecting system |
| CN202141781U (en) * | 2011-06-21 | 2012-02-08 | 山东电力研究院 | Online monitoring and positioning device for transformer station partial discharge signals |
| CN202217029U (en) * | 2011-08-02 | 2012-05-09 | 天津市电力公司 | Novel partial discharge comprehensive monitoring and analyzing system |
| CN202256581U (en) * | 2011-08-18 | 2012-05-30 | 山东电力研究院 | Partial discharge UHF signal envelope detection apparatus |
| CN102608502A (en) * | 2012-03-01 | 2012-07-25 | 华北电力大学 | Intelligent ultrahigh frequency local charge sensor |
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