CN103616624B - A kind of partial discharge monitoring system - Google Patents
A kind of partial discharge monitoring system Download PDFInfo
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- CN103616624B CN103616624B CN201310685246.2A CN201310685246A CN103616624B CN 103616624 B CN103616624 B CN 103616624B CN 201310685246 A CN201310685246 A CN 201310685246A CN 103616624 B CN103616624 B CN 103616624B
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Abstract
The embodiment of the invention discloses a kind of partial discharge monitoring system, comprising: the shelf depreciation sensing terminal being installed in each monitoring point of power system respectively; With the signaling switch of the quantity such as described shelf depreciation sensing terminal; Signal acquisition controller, wherein said signal acquisition controller comprises double-channel signal and gathers port and signal control port; The double-channel signal connecting shelf depreciation sensing terminal and described signal acquisition controller described in each gathers the signal bus of port; Connect the control bus of the signal control port of signaling switch described in each and described signal acquisition controller, described signal control port exports for controlling the control signal that signaling switch described in each is alternately closed, achieve reducing under the described installation cost of partial discharge monitoring system and the prerequisite of maintenance workload, the shelf depreciation situation of power system is carried out on-line monitoring.
Description
Technical field
The present invention relates to partial discharge monitoring technical field, more specifically, it relates to a kind of partial discharge monitoring system.
Background technology
Utilize partial discharge monitoring technology that the shelf depreciation situation of power system is carried out on-line monitoring, to safeguard in time when finding that insulating fault occurs in a certain monitoring point, it is the important means ensureing described power system reliability service.
In the prior art, by for installing a set of independent partial discharge monitoring device separately in each monitoring point in described power system, and the monitoring data (local discharge signal namely collected) obtained manually is gathered, the Partial Discharge Sources (namely there is the monitoring point of insulating fault) obtaining in whole power system existing can be investigated; Wherein said partial discharge monitoring device comprises: for detecting the local signal detection terminal obtaining the local discharge signal that corresponding monitoring point sends, and described local discharge signal detection obtained carries out the local signal acquisition controller of collection in real time.
But, for the partial discharge monitoring system being made up of each partial discharge monitoring device above-mentioned, due to the local signal acquisition controller One's name is legion wherein comprised, therefore will inevitably there is the drawback that installation cost is higher and maintenance workload is bigger of Monitoring systems itself.
Summary of the invention
In view of this, the present invention provides a kind of partial discharge monitoring system, reducing under the described installation cost of partial discharge monitoring system and the prerequisite of maintenance workload, the shelf depreciation situation of power system is carried out on-line monitoring to realize.
A kind of partial discharge monitoring system, comprising:
It is installed in the shelf depreciation sensing terminal of each monitoring point of power system respectively;
With the signaling switch of the quantity such as described shelf depreciation sensing terminal;
Signal acquisition controller, wherein said signal acquisition controller comprises double-channel signal and gathers port and signal control port;
The double-channel signal connecting shelf depreciation sensing terminal and described signal acquisition controller described in each gathers the signal bus of port;
Connecting the control bus of the signal control port of signaling switch described in each and described signal acquisition controller, described signal control port exports for controlling the control signal that signaling switch described in each is alternately closed.
Optionally, described signal acquisition controller also comprises: output port, exports the amplitude of the original local discharge signal utilizing signal attenuation calculation formula to calculate; Wherein said original local discharge signal is that the local discharge signal before signal attenuation occurs.
Wherein, described signal attenuation calculation formula is:
Wherein, the local discharge signal that described double-channel signal collection port collects comprises first via local discharge signal and the 2nd road local discharge signal, and described double-channel signal gathers port and comprises the first signals collecting port for gathering described first via local discharge signal and gather port for gathering the second signal of described 2nd road local discharge signal;
A represents the amplitude of described original local discharge signal, A1Represent the amplitude of described first via local discharge signal, A2Represent the amplitude of described 2nd road local discharge signal, a represents the transmission length of described first via local discharge signal in described signal bus, b represents the transmission length of described 2nd road local discharge signal in described signal bus, and X represents that described double-channel signal is gathered the reduction coefficient of the local discharge signal that port collects by described signal bus.
Wherein, described shelf depreciation sensing terminal comprises: the signal conditioning circuit that local discharge sensor and the output terminal with described local discharge sensor are connected.
Wherein, described local discharge sensor comprises: partial-discharge ultrahigh-frequency sensor.
Wherein, described local discharge sensor comprises: shelf depreciation High Frequency Current Sensor.
Wherein, described local discharge sensor comprises: shelf depreciation ultrasonic sensing device.
Wherein, described signal bus is radioshielding signal bus.
Optionally, described partial discharge monitoring system also comprises the power switch on the electric power incoming line being installed in shelf depreciation sensing terminal described in each respectively; Wherein, described control bus connects the signal control port of power switch described in each and described signal acquisition controller; Described signal control port also exports the control signal being alternately closed for controlling power switch described in each.
Optionally, described partial discharge monitoring system also comprises: the communication module being connected with described signal acquisition controller.
As can be seen from above-mentioned technical scheme, the embodiment of the present invention utilizes the shelf depreciation sensing terminal being installed in each monitoring point respectively to detect the local discharge signal obtaining different monitoring points and sending, and a signaling switch is set respectively at the output terminal of each shelf depreciation sensing terminal described, thus, by controlling being alternately closed of each signaling switch, the local discharge signal that the signal acquisition controller described in the present embodiment collects different monitoring points successively and sends can be made, thus reach the object that the shelf depreciation situation to whole power system carries out on-line monitoring. compared to prior art, partial discharge monitoring system described in the present embodiment is only by arranging a signal acquisition controller, the control of the online acquisition to the local discharge signal that whole power system sends and this collection control process can be realized without the need to manually gathering, investigate, because this reducing the installation cost of described partial discharge monitoring system and maintenance workload, saved staff, the investigation time obtaining existing in whole power system the monitoring point of insulating fault,
In addition, only there is just can carry out during insulating fault the collection control work of local discharge signal in the monitoring point at its place due to existing local signal acquisition controller, therefore plant factor is lower, signal acquisition controller described in the present embodiment is then the local discharge signal sent for gathering each monitoring point successively, therefore improves the utilization ratio of equipment, reduces equipment investment cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, it is briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the disclosed a kind of partial discharge monitoring system architecture schematic diagram of the embodiment of the present invention one;
Fig. 2 is the embodiment of the present invention two another partial discharge monitoring system architecture schematic diagram disclosed.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only the present invention's part embodiment, instead of whole embodiments. Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 1, the embodiment of the present invention one discloses a kind of partial discharge monitoring system, is reducing under the described installation cost of partial discharge monitoring system and the prerequisite of maintenance workload to realize, the shelf depreciation situation of power system is being carried out on-line monitoring, comprising:
It is installed in the shelf depreciation sensing terminal 100 of each monitoring point of power system respectively;
With the signaling switch 200 of the quantity such as shelf depreciation sensing terminal 100;
Signal acquisition controller 300, wherein signal acquisition controller 300 comprises double-channel signal collection port and signal control port;
Connect the signal bus 401 of the double-channel signal collection port of each shelf depreciation sensing terminal 100 with signal acquisition controller 300;
Connecting the control bus 402 of each signaling switch 200 with the signal control port of signal acquisition controller 300, described signal control port exports for controlling the control signal that each signaling switch 200 is alternately closed.
In the present embodiment one, two data acquisition cards that the two ends of signal bus 401 gather port with described double-channel signal respectively are connected, and each shelf depreciation sensing terminal 100 parallel connection access signal bus 401, thus, after the local discharge signal that the detection of each shelf depreciation sensing terminal 100 obtains outputs to signal bus 401, the double-channel signal that two-way can be divided to be transferred to signal bus 401 gathers port; That is, the local discharge signal (local discharge signal that also namely described double-channel signal collection port collects) of transmission in signal bus 401 is a point local discharge signal for two-way transmission.
In described partial discharge monitoring system work process, the control bus 402 being connected with each signaling switch 200 transmits the control signal that described signal control port exports, now owing to each signaling switch 200 is alternately closed, therefore at one time within, the local discharge signal that only detection of shelf depreciation sensing terminal 100 obtains can be transferred in signal bus 401, and in collected signal acquisition controller 300, therefore signal acquisition controller 300 described in the present embodiment one often collects once the local discharge signal of described point of two-way transmission, can accurately locate and obtain now corresponding local radiation source, thus utilize a signal acquisition controller 300 to replace existing numerous local signal acquisition controller, reach the effect that the shelf depreciation situation to whole power system carries out on-line monitoring.
Seen from the above description, the present embodiment one utilizes the shelf depreciation sensing terminal being installed in each monitoring point respectively to detect the local discharge signal obtaining different monitoring points and sending, and a signaling switch is set respectively at the output terminal of each shelf depreciation sensing terminal described, thus by controlling being alternately closed of each signaling switch, the local discharge signal that the signal acquisition controller described in the present embodiment one collects different monitoring points successively and sends can be made, thus reach the object that the shelf depreciation situation to whole power system carries out on-line monitoring. Compared to prior art, partial discharge monitoring system described in the present embodiment one is only by arranging a signal acquisition controller, the control of the online acquisition to the local discharge signal that whole power system sends and this collection control process can be realized without the need to manually gathering, investigate, because this reducing the installation cost of described partial discharge monitoring system and maintenance workload, saved staff, the investigation time obtaining existing in whole power system the monitoring point of insulating fault.
Wherein, still see Fig. 1, shelf depreciation sensing terminal 100, as the terminating unit obtaining the local discharge signal that corresponding monitoring point sends for detecting, can specifically comprise: the signal conditioning circuit 102 that local discharge sensor 101 and the output terminal with local discharge sensor 101 are connected on its structure composition.
Wherein, local discharge sensor 101, obtains, for sensing, the local discharge signal that corresponding monitoring point sends; In actual applications, difference of installation form needed for it, can select built-in local discharge sensor and/or external placed type local discharge sensor flexibly; In addition for strengthening sensitivity and the immunity from interference of local discharge sensor 101, difference according to monitoring of environmental, can take the circumstances into consideration to select partial-discharge ultrahigh-frequency sensor, shelf depreciation High Frequency Current Sensor and/or shelf depreciation ultrasonic sensing device to be used as local discharge sensor 101, select form comparatively flexible.
Wherein, signal conditioning circuit 102, for carrying out respective handling to the local discharge signal that local discharge sensor 101 sensing obtains, to obtain to gather the standard signal of port identification for the double-channel signal of signal acquisition controller 300. Concrete:
Signal conditioning circuit 102 with described partial-discharge ultrahigh-frequency sensor is directly connected, can comprise: ultra-high frequency amplifier, ultra-high-frequency filter, ultra-high frequency wave-detector and frequency down circuit etc.; Wherein, described partial-discharge ultrahigh-frequency sensor is applicable in the monitoring of environmental of local discharge signal frequency between 500MHz��1.5GHz, described ultra-high-frequency filter can select channel frequence scope to be respectively the wave filter of 300MHz��500MHz, 600MHz��800MHz or 1.1GHz��1.3GHz, described ultra-high frequency amplifier can select the amplifier that gain amplifier is not less than 30dB, and described ultra-high frequency wave-detector can adopt the envelope detector that time constant is not more than 1 �� s.
Signal conditioning circuit 102 with described shelf depreciation High Frequency Current Sensor is directly connected, can comprise: radio-frequency amplifier and High frequency filter device; Wherein, described shelf depreciation High Frequency Current Sensor is applicable in the monitoring of environmental of local discharge signal frequency between 1MHz��80MHz, described High frequency filter device can select channel frequence size not higher than the Hi-pass filter of 1MHz, and described radio-frequency amplifier can select the amplifier that gain amplifier is not less than 20dB.
Signal conditioning circuit 102 with described shelf depreciation ultrasonic sensing device is directly connected, can comprise: ultrasonic signal amplifier; Wherein, described shelf depreciation ultrasonic sensing device is applicable in the monitoring of environmental of local discharge signal frequency between 20KHz��80KHz, and described ultrasonic signal amplifier can select the amplifier of gain amplifier between 20dB��60dB.
In addition, entering signal bus 401 for avoiding extraneous interference signal and the transmitting procedure of the local discharge signal that described point of two-way transmits is caused interference, therefore the preferred radioshielding signal bus of the present embodiment one is as signal bus 401; Will inevitably there is signal attenuation when considering that signal transmits in bus in addition, cause signal amplitude to reduce, therefore time for ensureing that the described double-channel signal dividing the local discharge signal of two-way transmission to be transferred to signal acquisition controller 300 gathers port, two paths of signals all has certain amplitude, and the length that therefore the present embodiment one sets described radioshielding signal bus is no more than 1000 meters.
Based on embodiment one, the embodiment of the present invention two discloses another partial discharge monitoring system, reducing under the described installation cost of partial discharge monitoring system and the prerequisite of maintenance workload, the shelf depreciation situation of power system is carried out on-line monitoring to realize, see Fig. 2, comprising:
It is installed in the signaling switch 200 of the quantity such as shelf depreciation sensing terminal 100 and shelf depreciation sensing terminal 100 of each monitoring point of power system, signal acquisition controller 300, signal bus 401 and control bus 402 respectively; Wherein signal acquisition controller 300 comprises double-channel signal collection port, signal control port and output port;
Wherein, described output port, for exporting the amplitude of the original local discharge signal utilizing signal attenuation calculation formula to calculate; Wherein, described original local discharge signal is the local discharge signal occurred before signal attenuation, namely directly exports, not yet enters the local discharge signal of signal bus 401 by shelf depreciation sensing terminal 100.
Concrete, after the local discharge signal that shelf depreciation sensing terminal 100 exports enters signal bus 401, start to transmit (namely dividing two road direction signal acquisition controllers 300 to transmit) to both sides, and the double-channel signal of final collected signal acquisition controller 300 gathers port; But the local discharge signal (namely dividing the local discharge signal that two-way transmits) collected due to signal acquisition controller 300 exists signal attenuation in the process of signal bus 401 propagate and its signal attenuation degree of difference according to transmission range is not identical yet, it is therefore desirable to the amplitude of the local discharge signal of described point of two-way transmission is carried out restore calculation;
Wherein, utilize described signal attenuation calculation formula, calculate the process of the amplitude of described original local discharge signal, specific as follows:
First for ease of describing, being set as follows in advance: the local discharge signal of described point of two-way transmission comprises first via local discharge signal and the 2nd road local discharge signal, described double-channel signal gathers port and comprises the first signals collecting port for gathering described first via local discharge signal and gather port for gathering the second signal of described 2nd road local discharge signal;
Described signal attenuation calculation formula is:
Wherein, A represents the amplitude of described original local discharge signal, A1Represent the amplitude of described first via local discharge signal, A2Represent the amplitude of described 2nd road local discharge signal, a represents the transmission length of described first via local discharge signal transmission in described signal bus, b represents the transmission length of described 2nd road local discharge signal transmission in described signal bus, X represents that described double-channel signal is gathered the reduction coefficient of the local discharge signal that port collects by described signal bus, and a+b is the total length of signal bus 300;
Thus, amplitude (the i.e. above-mentioned A of the local discharge signal collected according to the double-channel signal collection port of signal acquisition controller 3001And A2), utilize described signal attenuation calculation formula, can directly calculate the amplitude A of described original local discharge signal;
The derivation of wherein said signal attenuation calculation formula can briefly be summarized as follows:
Signal energy shared by described first via local discharge signal and described 2nd road local discharge signal is 0.5 times of the total energy of the local discharge signal of described point of two-way transmission, therefore certainly exists following formula 1-2:
0.5*A*ea*X/20=A1(formula 1),
0.5*A*eb*X/20=A2(formula 2),
Thus, can directly derive according to described formula 1-2 and obtain formula
Seen from the above description, the amplitude of the original local discharge signal before signal attenuation is there is in the present embodiment two by calculating, staff is made directly to know the original discharge state in each local radiation source by described signal acquisition controller, it is ensured that accurately the carrying out of Partial Discharge Sources investigation work.
In addition, still see Fig. 2, the partial discharge monitoring system described in the embodiment of the present invention two also can comprise: the power switch 500 being installed on the electric power incoming line of each shelf depreciation sensing terminal 100 respectively;
Wherein, control bus 402 connects the signal control port of each power switch 500 and signal acquisition controller 300; Described signal control port also exports the control signal being alternately closed for controlling each power switch 500.
Concrete, signal acquisition controller 300 is for, after a certain signaling switch of control 200 is closed, first controlling the power switch 500 corresponding with this signaling switch 200 and close; Simultaneously when detecting that this signaling switch 200 is about to disconnect, first control the power switch 500 corresponding with this signaling switch 200 and disconnect;
Wherein, the power switch 500 corresponding with a certain signaling switch 200 is the power switch 500 being connected on same shelf depreciation sensing terminal 100 with this signaling switch 200.
Seen from the above description, the present embodiment two is alternately closed along with signaling switch, control power switch corresponding with it to be alternately closed, thus ensure that in described partial discharge monitoring system work process, only there is a shelf depreciation sensing terminal in running order, reduce load size to greatest extent, saved electric energy.
In addition, the partial discharge monitoring system described in the embodiment of the present invention two also can comprise: the communication module (Fig. 2 does not illustrate) being connected with signal acquisition controller 300, for the monitor data that signal acquisition controller 300 exports is uploaded to remote monitoring center.
In sum, the embodiment of the present invention utilizes the shelf depreciation sensing terminal being installed in each monitoring point respectively to detect the local discharge signal obtaining different monitoring points and sending, and a signaling switch is set respectively at the output terminal of each shelf depreciation sensing terminal described, thus, it is alternately closed by controlling each signaling switch, the local discharge signal that the signal acquisition controller described in the present embodiment collects different monitoring points successively and sends can be made, thus reach the object that the shelf depreciation situation to whole power system carries out on-line monitoring. Compared to prior art, partial discharge monitoring system described in the present embodiment is only by arranging a signal acquisition controller, the control of the online acquisition to the local discharge signal that whole power system sends and this collection control process can be realized without the need to manually gathering, investigate, because this reducing the installation cost of described partial discharge monitoring system and maintenance workload, saved staff, the investigation time obtaining existing in whole power system the monitoring point of insulating fault;
In addition, only there is just can carry out during insulating fault the collection control work of local discharge signal in the monitoring point at its place due to existing local signal acquisition controller, therefore plant factor is lower, signal acquisition controller described in the present embodiment is then the local discharge signal sent for gathering each monitoring point successively, therefore improves the utilization ratio of equipment, reduces equipment investment cost.
In this specification sheets, each embodiment adopts the mode gone forward one by one to describe, and what each embodiment emphasis illustrated is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are enable to realize or use the present invention. To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments. Therefore, the present invention can not be limited in these embodiments shown in this article, but be met the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. a partial discharge monitoring system, it is characterised in that, comprising:
It is installed in the shelf depreciation sensing terminal of each monitoring point of power system respectively;
With the signaling switch of the quantity such as described shelf depreciation sensing terminal;
Signal acquisition controller, wherein said signal acquisition controller comprises double-channel signal and gathers port and signal control port;
The double-channel signal connecting shelf depreciation sensing terminal and described signal acquisition controller described in each gathers the signal bus of port;
Connecting the control bus of the signal control port of signaling switch described in each and described signal acquisition controller, described signal control port exports for controlling the control signal that signaling switch described in each is alternately closed;
Described signal acquisition controller also comprises: output port, exports the amplitude of the original local discharge signal utilizing signal attenuation calculation formula to calculate;
Wherein, described original local discharge signal is that the local discharge signal before signal attenuation occurs;
Described signal attenuation calculation formula is:
Wherein, the local discharge signal that described double-channel signal collection port collects comprises first via local discharge signal and the 2nd road local discharge signal, and described double-channel signal gathers port and comprises the first signals collecting port for gathering described first via local discharge signal and gather port for gathering the second signal of described 2nd road local discharge signal;
A represents the amplitude of described original local discharge signal, A1Represent the amplitude of described first via local discharge signal, A2Represent the amplitude of described 2nd road local discharge signal, a represents the transmission length of described first via local discharge signal in described signal bus, b represents the transmission length of described 2nd road local discharge signal in described signal bus, and X represents that described double-channel signal is gathered the reduction coefficient of the local discharge signal that port collects by described signal bus.
2. partial discharge monitoring system according to claim 1, it is characterised in that, described shelf depreciation sensing terminal comprises: the signal conditioning circuit that local discharge sensor and the output terminal with described local discharge sensor are connected.
3. partial discharge monitoring system according to claim 2, it is characterised in that, described local discharge sensor comprises: partial-discharge ultrahigh-frequency sensor.
4. partial discharge monitoring system according to claim 2, it is characterised in that, described local discharge sensor comprises: shelf depreciation High Frequency Current Sensor.
5. partial discharge monitoring system according to claim 2, it is characterised in that, described local discharge sensor comprises: shelf depreciation ultrasonic sensing device.
6. partial discharge monitoring system according to claim 1, it is characterised in that, described signal bus is radioshielding signal bus.
7. partial discharge monitoring system according to claim 1, it is characterised in that, described partial discharge monitoring system also comprises: the power switch being installed on the electric power incoming line of shelf depreciation sensing terminal described in each respectively;
Wherein, described control bus connects the signal control port of power switch described in each and described signal acquisition controller; Described signal control port also exports the control signal being alternately closed for controlling power switch described in each.
8. partial discharge monitoring system according to claim 1, it is characterised in that, described partial discharge monitoring system also comprises: the communication module being connected with described signal acquisition controller.
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| JP2636743B2 (en) * | 1994-08-03 | 1997-07-30 | 東京電力株式会社 | Partial discharge measurement method |
| CN1834669A (en) * | 2006-04-19 | 2006-09-20 | 重庆大学 | On-line detecting and positioning device for local discharging of electrical insulated combined electrical appliance, and positioning method thereof |
| EP2344898B1 (en) * | 2008-09-24 | 2012-10-31 | Siemens Energy, Inc. | Partial discharge coupler for application on high voltage generator bus works |
| CN102879718A (en) * | 2012-10-09 | 2013-01-16 | 上海交通大学 | Wired-loop-based entire-station monitoring and positioning system and positioning method for partial discharge |
| CN203616434U (en) * | 2013-12-13 | 2014-05-28 | 国家电网公司 | Partial discharge monitoring system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10185986A (en) * | 1996-12-26 | 1998-07-14 | Nissin Electric Co Ltd | Antenna for detecting anomaly of cable end processing part and anomaly detector |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2636743B2 (en) * | 1994-08-03 | 1997-07-30 | 東京電力株式会社 | Partial discharge measurement method |
| CN1834669A (en) * | 2006-04-19 | 2006-09-20 | 重庆大学 | On-line detecting and positioning device for local discharging of electrical insulated combined electrical appliance, and positioning method thereof |
| EP2344898B1 (en) * | 2008-09-24 | 2012-10-31 | Siemens Energy, Inc. | Partial discharge coupler for application on high voltage generator bus works |
| CN102879718A (en) * | 2012-10-09 | 2013-01-16 | 上海交通大学 | Wired-loop-based entire-station monitoring and positioning system and positioning method for partial discharge |
| CN203616434U (en) * | 2013-12-13 | 2014-05-28 | 国家电网公司 | Partial discharge monitoring system |
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