CN202815161U - Partial discharge monitoring system for multiple electric power equipments arranged in a separate way - Google Patents
Partial discharge monitoring system for multiple electric power equipments arranged in a separate way Download PDFInfo
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- CN202815161U CN202815161U CN 201220517141 CN201220517141U CN202815161U CN 202815161 U CN202815161 U CN 202815161U CN 201220517141 CN201220517141 CN 201220517141 CN 201220517141 U CN201220517141 U CN 201220517141U CN 202815161 U CN202815161 U CN 202815161U
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Abstract
The utility model discloses a partial discharge monitoring system for multiple electric power equipments arranged in a separate way. The monitoring system comprises a high-frequency shield bus ring with a plurality of co-current contacts thereon; a single-channel data acquisition unit connected with the high-frequency shield bus ring; and a plurality of sensing terminals connected with the high-frequency shield bus ring in a parallel way respectively on the plurality of co-current contacts. Each sensing terminal comprises an ultrahigh-frequency sensor correspondingly receiving partial discharge signals of each piece of electric power equipment; an ultrahigh-frequency broadband amplifier having the input end connected with the ultrahigh-frequency sensor; and a high-frequency signal isolator having the input end connected with the output end of the ultrahigh-frequency broadband amplifier. The output end of the high-frequency signal isolator is connected on the co-current contacts. Each of the co-current contacts is respectively corresponding to a first path and a second path. The difference between the first path and the second path corresponded by each co-current contact is different. The monitoring system can achieve on-line synchronous monitoring on electrical equipment arranged in a transformer station in a separate way.
Description
Technical field
The utility model relates to a kind of monitoring device, relates in particular to a kind of electric signal monitoring device.
Background technology
Partial Discharge Detection, is extensively generally used at power domain because it can reflect the insulation status of electric system electrical equipment timely and effectively as the important means of insulation diagnosis.At present, basically all be the research of carrying out partial discharge monitoring and monitoring technology for the concrete power equipment of transformer station both at home and abroad, main detection principle and the method for using comprises pulse current method, superfrequency method (UHF, Ultra High Frequency), supercritical ultrasonics technology, chemical method, optical method etc.Usually, partial discharge monitoring and location for substation equipment mainly are to carry out for the concrete single equipment such as GIS, transformer, capacitive apparatus, and the method for monitoring and location mainly comprises method for ultrasonic locating, electrical Location method and uhf electromagnetic wave localization method.
Wherein, the superfrequency method is practical feasible method.The ultimate principle of uhf electromagnetic wave localization method is to adopt uhf sensor to receive the mistiming of same discharge source uhf electromagnetic wave signal, then positions according to these time differences and electromagnetic wave propagation speed.Use the method to monitor or locate the power equipment shelf depreciation, generally adopt portable equipment to patrol and examine and install online monitoring equipment dual mode.Routine inspection mode has the fixing detection test period because of it, can not monitor the overall process of equipment operation.In addition, shelf depreciation band electro-detection is high to the survey crew technical requirement, patrols and examines personnel's on-site experience and judges the testing result impact larger.Online monitoring equipment is installed to be designed for single power equipment.But partial discharges fault all may occur in any high voltage electric power equip ment in transformer station; If want the electrical equipment at the full station of transformer station is implemented monitoring, then need corresponding installation to overlap monitoring device to form a cover monitoring system more.The required expense of such monitoring system is high and service efficiency is also low, and need to pay larger maintenance workload to a plurality of on-line monitoring equipment.
In addition, above-mentioned individual equipment is not installed the prior art of on-Line Monitor Device if do not adopt, then can also adopt at the solid space at full station the method that one group of ultra broadband superfrequency sensor array receives the electromagnetic wave signal that shelf depreciation sends is installed.This method is based on the electromagnetic wave space orientation technique, utilize the position that time difference of the signal that each sensor receives calculated and located shelf depreciation, satisfy a covering device and just can carry out the monitoring of shelf depreciation and the requirement of location to the power equipment at the full station of transformer station, to obtain and to analyze the discharge scenario of whole substation equipment.But since the sensor setting distance that receives discharge signal from equipment under test away from, and discharge signal can aerial continuous decay, so this method is only suitable for apparent in view partial discharge monitoring and location.
Therefore, along with development economic and society, people are more and more higher to the requirement of power supply reliability, hope is located the shelf depreciation of power equipment by the partial discharge monitoring system that is used for many power equipments dispersed placement of a kind of low cost, high reliability, thereby realizes the monitoring to the real-time status of complete all high voltage electric equipments of standing of transformer station.
Summary of the invention
The purpose of this utility model provides a kind of partial discharge monitoring system for many power equipments dispersed placement, this system should carry out synchronous on-line monitoring to the power equipment of a plurality of dispersed placement in the transformer station, by monitoring and then can locate the power equipment of shelf depreciation, thereby find in advance the existing defective of power equipment, guarantee the normal operation of each power equipment of transformer station.
To achieve these goals, the utility model provides a kind of partial discharge monitoring system for many power equipments dispersed placement, and it comprises:
One radioshielding bus ring has several also contacts on it;
One single channel data acquisition unit, it is connected with this radioshielding bus ring;
Several sensing terminals, it is respectively at several and contact and radioshielding bus ring and connect, and each sensing terminal includes:
One superfrequency sensor, its corresponding local discharge signal that receives each power equipment;
One superfrequency broad band amplifier, its input end is connected with described superfrequency sensor;
One high-frequency signal isolator, its input end is connected with the output terminal of described superfrequency broad band amplifier, and its output terminal is connected in and contact;
Wherein, each and contact are respectively to having one first path and one second path, this first path be local discharge signal from and contact begin to transfer to the path of single channel data acquisition unit with first direction along the radioshielding bus ring, this second path for from and contact begin to transfer in the opposite direction the path of single channel data acquisition unit along the radioshielding bus ring with first party; Each first path that also contact is corresponding is different from the difference in the second path.
The local discharge signal of the synchronous monitoring system of the power equipment of the described shelf depreciation of the technical program by the power equipment of sensing terminal Real-Time Monitoring dispersed placement in transformer station, then according to same local discharge signal since the mistiming that the different asynchronism(-nization)s that cause arriving the single channel data acquisition unit of the length in two-way propagation path form locate the power equipment of shelf depreciation.
Partial discharge monitoring system for many power equipments dispersed placement described in the utility model is when work: in case partial discharge phenomenon has occured certain power equipment, this local discharge signal can be received by the superfrequency sensor, then transfer to the superfrequency broad band amplifier and carry out the signal amplification, then be transferred on the radioshielding bus ring by high-frequency signal isolator that (high-frequency signal isolator is used for realizing the one-way transmission of local discharge signal before access and contact, thereby prevent that the local discharge signal reverse transfer of other sensing terminal couplings is to current sensing terminal), on the total loop wire of radioshielding signal, transfer to single channel data acquisition unit along two opposite directions (i.e. the first path and the second path) through the local discharge signal that amplifies, because the length in the first path and the second path is different and length difference is fixed, the velocity of propagation of local discharge signal is certain simultaneously, therefore for some specific power equipments, its local discharge signal is fixing by the mistiming that the first path and the second path arrive respectively the single channel data acquisition unit, the mistiming of the corresponding local discharge signal of power equipment that each are different then is different, these different and specific mistimings just become " identity code " corresponding with each power equipment, different and specific mistimings just can position the power equipment of generation shelf depreciation by these, reach the purpose of the power equipment of a plurality of dispersed placement of Simultaneous Monitoring.
Further, in the partial discharge monitoring system for many power equipments dispersed placement described in the utility model, the two adjacent also distances between the contact are not less than 25m.Be like this cause for two waveforms that partial discharge pulse's signal of preventing sensing terminal coupling arrives the single channel data acquisition unit along the transmission of radioshielding bus ring occur overlapping can not computing time poor.
Further, in the partial discharge monitoring system for many power equipments dispersed placement described in the utility model, the length of described radioshielding bus ring is no more than 100m.Because local discharge signal is to show with the waveform of certain amplitude at the single channel data acquisition unit, in order to guarantee that local discharge signal that each sensing terminal receives propagates into the single channel data acquisition unit certain amplitude is all arranged, therefore need the length of control radioshielding bus ring should not be long to avoid the decay of signal in transmission course.
Further, in the partial discharge monitoring system for many power equipments dispersed placement described in the utility model, number described and contact is no more than 8.In order to make the single channel data acquisition unit obtain accurately objectively local discharge signal, preferably also the number of contact be set to≤8.
In the partial discharge monitoring system for many power equipments dispersed placement described in the utility model, described single channel data acquisition unit has a controller.
Further, partial discharge monitoring system for many power equipments dispersed placement described in the utility model also comprises a remote monitoring unit, it is connected with single channel data acquisition unit data, and the data of single channel data acquisition unit collection are processed and analyzed.
In the partial discharge monitoring system for many power equipments dispersed placement described in the utility model, the frequency range that described superfrequency sensor receives local discharge signal is 500 MHz～1.5GHz, belongs to the frequency range of superfrequency local discharge signal.
In the partial discharge monitoring system for many power equipments dispersed placement described in the utility model, the gain of described superfrequency broad band amplifier is 40dB.
Partial discharge monitoring system for many power equipments dispersed placement described in the utility model has following advantage than existing partial discharge monitoring system:
(1) can be simultaneously the power equipment of a plurality of scattering devices be carried out on-line monitoring, and accurately judge the device location that shelf depreciation occurs;
(2) reduce the cost of substation equipment shelf depreciation Simultaneous Monitoring, reduced the maintenance and repair expenditure of partial discharge monitoring system, be conducive to promote the on-line synchronous monitoring capability of the transformer station that is provided with a large amount of power equipments;
(3) can find in advance and eliminate the defective of power equipment, reduce the generation of full station power outage;
(4) not only guarantee the safe operation of single power equipment, also guaranteed the smooth working of whole transformer station, thereby improved work efficiency and the intelligent level of transformer station.
Description of drawings
Fig. 1 is the partial discharge monitoring system system architecture synoptic diagram in one embodiment for many power equipments dispersed placement described in the utility model.
Fig. 2 has shown in the partial discharge monitoring system for many power equipments dispersed placement described in the utility model, by the waveshape mistiming of single channel data acquisition unit collection.
Embodiment
Come the partial discharge monitoring system for many power equipments dispersed placement described in the utility model is further explained explanation below in conjunction with specific embodiment and Figure of description.
As shown in Figure 1, the partial discharge monitoring system that is used for many power equipments dispersed placement in the present embodiment comprises: be arranged on the radioshielding bus ring 1 in the transformer station, and be installed in superfrequency sensor 31 on each power equipment of transformer station, wherein each superfrequency sensor 31 equal correspondence connects superfrequency broad band amplifiers (gain is 40dB) 32, each superfrequency broad band amplifier 32 is corresponding to connect a high-frequency signal isolator 33, the output terminal of high-frequency signal isolator 33 in and contact 2 connect into radioshielding bus ring 1; In addition, also be connected with the single channel data acquisition unit 4 of a tape controller on the radioshielding bus ring 1, single channel data acquisition unit 4 is connected with the remote monitoring cell data.
Please continue to consult Fig. 1, the below will be take any one sensing terminal 3 as example, introduces the course of work of the partial discharge monitoring system for many power equipments dispersed placement described in the utility model.As shown in Figure 1, if shelf depreciation occurs in the power equipment place that superfrequency sensor i is installed, partial-discharge ultrahigh-frequency signal can be received by uhf sensor Si, and pass through radioshielding bus ring 1 and transmit signal to both direction, because the path is different, its transmission time that arrives single channel data acquisition unit 4 also can be different, be respectively ti1 and ti2, the partial-discharge ultrahigh-frequency signal that receives by uhf sensor Si so pass to single channel data acquisition unit 4 places can exist one obvious time of arrival poor △ ti=ti1-ti2.Simultaneously, since the local discharge signal that the uhf sensor at each power equipment place receives the time of arrival of single channel data acquisition unit 4 difference be specific and different, therefore can with this time of arrival of poor location local discharge signal, monitor the shelf depreciation behavior.
In order further to improve the monitoring effect of the technical program, the length of radioshielding bus ring preferably is no more than 100m, on the radioshielding bus ring and the number of contact (namely and the number of the sensing terminal that connects) preferably be no more than 8, guarantee that simultaneously the two adjacent also distances between the contact are not less than 25m.
Fig. 2 has shown the waveform that the single channel data acquisition unit gathers, and can calculate this signal by the time difference of calculating partial discharge pulse's waveform is by which sensor to be accepted, thereby navigates to the equipment that the shelf depreciation discharge occurs.The time difference calculates can be by calculating signal collected energy function, and the flex point of asking for energy function is determined the initial time of ultrahigh-frequency signal, thereby differ from t computing time.
Need to prove, arrange a plurality of and during contact at the radioshielding bus ring that the interval between a plurality of and contact can according to the substation field environment, arrange in satisfying every technical parameter claimed range.Simultaneously, uhf sensor can be installed in apart from the relatively near position of power equipment that needs monitoring, can guarantee that like this monitoring system has good sensitivity, can improve the signal to noise ratio (S/N ratio) of signal simultaneously.In addition, for uhf sensor, built-in uhf sensor can effectively shield all kinds of external electromagnetic interference, in the unappeasable situation of built-in uhf sensor, also can use external superfrequency sensor, and eliminate as far as possible external electromagnetic interference.
Be noted that above enumerate only for specific embodiment of the utility model, obviously the utility model is not limited to above embodiment, and many similar variations are arranged thereupon.If those skilled in the art all should belong to protection domain of the present utility model from all distortion that the disclosed content of the utility model directly derives or associates.
Claims (8)
1. a partial discharge monitoring system that is used for many power equipments dispersed placement is characterized in that, comprising:
One radioshielding bus ring has several also contacts on it;
One single channel data acquisition unit, it is connected with described radioshielding bus ring;
Several sensing terminals, it is respectively at described several and contact and radioshielding bus ring and connect, and described each sensing terminal includes:
One superfrequency sensor, its corresponding local discharge signal that receives each power equipment;
One superfrequency broad band amplifier, its input end is connected with described superfrequency sensor;
One ultrahigh-frequency signal isolator, its input end is connected with the output terminal of described superfrequency broad band amplifier, and its output terminal is connected in and contact;
Wherein, described each and contact are respectively to having one first path and one second path, described the first path be local discharge signal from and contact begin to transfer to the path of single channel data acquisition unit with first direction along the radioshielding bus ring, described the second path for from and contact begin to transfer in the opposite direction the path of single channel data acquisition unit along the radioshielding bus ring with first party; Described each first path that also contact is corresponding is different from the difference in the second path.
2. the partial discharge monitoring system for many power equipments dispersed placement as claimed in claim 1 is characterized in that, the two adjacent also distances between the contact are not less than 25m.
3. the partial discharge monitoring system for many power equipments dispersed placement as claimed in claim 2 is characterized in that the length of described radioshielding bus ring is no more than 100m.
4. the partial discharge monitoring system for many power equipments dispersed placement as claimed in claim 3 is characterized in that, number described and contact is no more than 8.
5. such as the described partial discharge monitoring system for many power equipments dispersed placement of any one among the claim 1-4, it is characterized in that described single channel data acquisition unit has a controller.
6. the partial discharge monitoring system for many power equipments dispersed placement as claimed in claim 5 is characterized in that, also comprises a remote monitoring unit, and it is connected with described single channel data acquisition unit data.
7. such as the described partial discharge monitoring system for many power equipments dispersed placement of any one among the claim 1-4, it is characterized in that the frequency range that described superfrequency sensor receives local discharge signal is 500MHz～1.5GHz.
8. the partial discharge monitoring system for many power equipments dispersed placement as claimed in claim 7 is characterized in that, the gain of described superfrequency broad band amplifier is 40dB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220517141 CN202815161U (en) | 2012-10-10 | 2012-10-10 | Partial discharge monitoring system for multiple electric power equipments arranged in a separate way |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220517141 CN202815161U (en) | 2012-10-10 | 2012-10-10 | Partial discharge monitoring system for multiple electric power equipments arranged in a separate way |
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| Publication Number | Publication Date |
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| CN202815161U true CN202815161U (en) | 2013-03-20 |
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| CN 201220517141 Expired - Fee Related CN202815161U (en) | 2012-10-10 | 2012-10-10 | Partial discharge monitoring system for multiple electric power equipments arranged in a separate way |
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| CN (1) | CN202815161U (en) |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130320 Termination date: 20151010 |
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| EXPY | Termination of patent right or utility model |