CN203249989U - Transformer partial discharge on-line monitoring system - Google Patents

Transformer partial discharge on-line monitoring system Download PDF

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Publication number
CN203249989U
CN203249989U CN 201320117491 CN201320117491U CN203249989U CN 203249989 U CN203249989 U CN 203249989U CN 201320117491 CN201320117491 CN 201320117491 CN 201320117491 U CN201320117491 U CN 201320117491U CN 203249989 U CN203249989 U CN 203249989U
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CN
China
Prior art keywords
partial discharge
transformer
line monitoring
unit
monitoring
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CN 201320117491
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Chinese (zh)
Inventor
张朝龙
胡绍刚
刘君
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辽宁省电力有限公司鞍山供电公司
国家电网公司
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Priority to CN 201320117491 priority Critical patent/CN203249989U/en
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Publication of CN203249989U publication Critical patent/CN203249989U/en

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Abstract

The utility model discloses a transformer partial discharge on-line monitoring system. The transformer partial discharge on-line monitoring system comprises a sensor monitoring unit and an on-site processing device. The sensor monitoring unit comprises a plurality of high frequency current sensors and a plurality of magnetically levitated ultrasonic probes, and the on-site processing device comprises a signal conditioning unit, an A/D conversion unit and a zigbee wireless transmission unit, which are connected orderly via a cable. The high frequency current sensors and the magnetically levitated ultrasonic probes in the sensor monitoring unit are connected with the signal conditioning unit in the on-site processing device separately via the cable, and the zigbee wireless transmission unit in the on-site processing device is connected with a background server via a zigbee wireless network. Advanced pulse separation technology and zigbee wireless transmission technology are used in the transformer partial discharge on-line monitoring system of the utility model, so that the interference pulse can not enter in the on-line monitoring system. The transformer partial discharge on-line monitoring system realizes the partial discharge on-line monitoring under a strong interference environment, and enables the monitoring data to be more real and reliable.

Description

The partial discharge of transformer on-line monitoring system
Technical field
The utility model belongs to power transmission and transformation equipment state on-line monitoring equipment technical field, is specifically related to a kind of partial discharge of transformer on-line monitoring system.
Background technology
Along with the fast development of electric system, capacity and the electric pressure of transformer improve constantly, and guarantee that transformer safely and steadily runs more and more to be subject to people's attention.Wherein, Insulation Problems is occupied very large proportion in transformer fault.All be to monitor transformer insulated as main take the dissolved gas analysis method in the past.
The partial discharge of transformer on-line monitoring than the advantage that dissolved gas analysis method has is, the inner fault that occurs of detection transformer, reactor that its energy is instantaneous, to non-pulse type shelf depreciation (about 500pC~1500pC) and more than the impulse type shelf depreciation (1500pC) all can carry out on-line monitoring, in developing into the process of impulse type shelf depreciation, non-pulse type shelf depreciation can make insulation ag(e)ing, and then insulation is damaged suddenly, it can not decomposite gas this evolution.This moment, the eudiometry of oil was inoperative, but the on-line monitoring of shelf depreciation can record whole process, and therefore the partial discharge of transformer on-line monitoring system of the on-the-spot operation of development is necessary.
Partial discharge monitoring has widely research at home and abroad as a kind of effective ways that detect transformer insulated performance.As: the BYT type PD system of Xi'an Communications University's research, it measures frequency band is 40kHz~2000kHz; Dongbei Electric Power Laboratory is that a 220kV/120MV.A transformer has been developed a cover local discharge on-line monitoring device, has adopted the interference mitigation technologies such as bandpass filtering, differential balance, polarity discrimination, and rejection ratio is more than 50dB; Partial discharge of transformer on-line monitoring system by Tsing-Hua University and Jilin Province Power Science Institute cooperation research and development; The PD system of Wuhan High Voltage Research Institute development, adopting bandwidth is the current sensor of 10~1000kHz.At present, the level of domestic PD on-line monitoring system approaches with external.
Summary of the invention
The purpose of this utility model is to provide a kind of partial discharge of transformer on-line monitoring system, has realized the on-line monitoring of shelf depreciation under the strong interference environment, makes Monitoring Data more true and reliable.
The technical scheme that the utility model adopts is, the partial discharge of transformer on-line monitoring system, include Sensor monitoring unit and site disposal device, the Sensor monitoring unit includes a plurality of High Frequency Current Sensor and a plurality of maglev type ultrasonic probe, the site disposal device includes the signal condition unit that connects successively by cable, A/D converting unit and zigbee wireless transmission unit, a plurality of High Frequency Current Sensor in the Sensor monitoring unit with are connected the maglev type ultrasonic probe and are connected with signal condition unit in the site disposal device by cable respectively, the zigbee wireless transmission unit in the site disposal device is connected with background server by the zigbee wireless network.
Characteristics of the present utility model also are,
High Frequency Current Sensor is more than 3.
The maglev type ultrasonic probe is more than 3.
The signal condition unit includes the fixed gain amplifier, wave filter, gain-programmed amplifier and the vernier amplifier that connect successively by cable.
Wave filter is programmable filter.
The beneficial effects of the utility model are,
(1) partial discharge of transformer on-line monitoring system of the present utility model is separated disturbing pulse and partial discharge pulse by advanced pulse separation technique, has realized the on-line monitoring of shelf depreciation under the strong interference environment, makes Monitoring Data more true and reliable.
(2) partial discharge of transformer on-line monitoring system of the present utility model adopts the communication between host computer that the zigbee wireless communication technology finishes master-control room and the on-the-spot measuring system, to realize the electrical isolation of on-the-spot and master-control room, is convenient to simultaneously installation and maintenance.
Description of drawings
Fig. 1 is the schematic diagram of partial discharge of transformer on-line monitoring system of the present utility model;
Fig. 2 is the shelf depreciation analog signal conditioner circuit structure diagram in the partial discharge of transformer on-line monitoring system of the present utility model;
Fig. 3 is the schematic diagram of the programmable filter in the partial discharge of transformer on-line monitoring system of the present utility model.
1. High Frequency Current Sensor, 2. maglev type ultrasonic probe, 3. site disposal device, 4. background server, 5. signal condition unit, 6.A/D converting unit, 7. software filtering and computing unit, 8.zigbee wireless transmission unit, 9. fixed gain amplifier, 10. wave filter, 11. gain-programmed amplifiers, 12. vernier amplifier, 13 Sensor monitoring unit.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
Partial discharge of transformer on-line monitoring system of the present utility model, as shown in Figure 1, include Sensor monitoring unit 13 and site disposal device 3, Sensor monitoring unit 13 includes a plurality of High Frequency Current Sensor 1 and a plurality of maglev type ultrasonic probe 2, site disposal device 3 includes the signal condition unit 5 that connects successively by cable, A/D converting unit 6 and zigbee wireless transmission unit 8, a plurality of High Frequency Current Sensor 1 in the Sensor monitoring unit 13 with are connected maglev type ultrasonic probe 2 and are connected with signal condition unit 5 in the site disposal device 3 by cable respectively, site disposal device 3 interior zigbee wireless transmission unit 8 are passed through the zigbee wireless network and are connected with background server 4.
The number of High Frequency Current Sensor 1 is more than 3; The number of maglev type ultrasonic probe 2 is more than 3.
Signal condition unit 5 as shown in Figure 2, includes the fixed gain amplifier 9, wave filter 10, gain-programmed amplifier 11 and the vernier amplifier 12 that connect successively by cable.
Wave filter adopts programmable filter as shown in Figure 3.Adopt the Bezier type bandpass filter of several groups of different bandwidths in the programmable filter, select wherein one group of conducting by analog switch, thereby realize changing the purpose of filter bandwidht.
Partial discharge of transformer on-line monitoring system of the present utility model has designed by two parts and formed: wherein one one is analog signal conditioner unit 5, the Sensor monitoring element output signal is adjusted in the scope of A/D converting unit 6 desired A/D converted input signals signal after the output conditioning by a plurality of amplifying circuits; Another one is filtering circuit, and the frequency band range by restricting signal suppresses undesired signal.
When signal is monitored, adopt hollow Luo-coil to be used for the shelf depreciation of monitoring transformer, wherein High Frequency Current Sensor 1 has been carried out special design, select suitable Observational frequency band, to improve sensitivity and the antijamming capability of monitoring.Be the shelf depreciation electric pulse of transformer inside to monitored equipment, adopt exclusive pulse separation technique to process, strengthen the antijamming capability of monitoring circuit, the local discharge signal of online acquisition transformer inside.
In the partial discharge of transformer on-line monitoring system of the present utility model, the a plurality of maglev type ultrasonic probe 2(gain that Sensor monitoring unit 13 refers to be installed on the High Frequency Current Sensor 1 of transformer body sleeve pipe leading-out terminal, bottom shielding of bushing earth terminal and iron core grounding end and is installed on oil tank of transformer shell position is greater than 40dB), by being installed in High Frequency Current Sensor 1 and the maglev type ultrasonic probe 2 on the transformer, utilize method for comprehensive detection, realize the Real-Time Monitoring of hyperchannel office's discharge signal and ultrasonic signal.Can be used for monitoring discharge capacity, discharge phase, the basic shelf depreciation parameter such as discharge time.
The principle of work of partial discharge of transformer on-line monitoring system of the present utility model is:
Adopt advanced pulse separation technique, disturbing pulse and partial discharge pulse are separated, thereby make the disturbing pulse of ten Wan Piku can't enter into on-line monitoring system, adopt simultaneously the zigbee wireless communication technology to finish the communication of long distance between the host computer of master-control room and the on-the-spot measuring system, to realize electrical isolation on-the-spot and master-control room, be convenient to simultaneously installation and maintenance.
The course of work of partial discharge of transformer on-line monitoring system of the present utility model:
(1) local discharge signal of all monitored points, ultrasonic signal gather by High Frequency Current Sensor 1 and maglev type ultrasonic probe 2 respectively, then send site disposal device 3 to by shielded cable;
(2) ultrasonic signal that the electric signal that sends by the 5 pairs of High Frequency Current Sensor 1 in the signal condition unit in the site disposal device 3 and maglev type ultrasonic probe 2 send carries out suitable pre-service, the amplitude that is about to electric signal and ultrasonic signal is adjusted to suitable level, and adopt wave filter 10 to suppress to the undesired signal of aliasing, to improve the antijamming capability of system;
(3) and then carry out the A/D conversion in the A/D converter 6 to sending into through signal after the conditioning of output after 5 processing of signal condition unit;
(4) at the scene in the treating apparatus, signal through the A/D conversion continues to be fed in software filtering, the computing unit 7, calculate required each parameter by the CPU in software filtering and the computing unit 7, the data communication device after will processing is again crossed the background server 4 that zigbee wireless transmission unit 8 transfers to master-control room;
(5) Monitoring Data uploaded of 4 pairs of site disposal devices 3 of background server is carried out the graphical demonstration of database storage and required corresponding parameter, demonstration and the query function of the information such as current real time data, the inquiry of historical data, discharge spectrum and discharge position are provided, simultaneously carry out the transformer state diagnostic analysis by expert software, further generate the suggestion of failure diagnosis information and maintenance decision.
When there is shelf depreciation transformer inside, then can produce pulsed current signal and acoustic emission signal, utilize Sensor monitoring unit 13 just can receive pulse signal at the utmost point in the short time, the Acoustic Radiation Pressure ripple then needs certain hour (sound wave velocity of propagation in oil is 1.44mm/us) could arrive the maglev type ultrasonic probe 2 that is close on the transformer.If the electroacoustic signal time-delay is oversize, the distance of estimation exceeds the physical dimension of transformer, and what then receive is undesired signal.When adopting 3 above maglev type ultrasonic probes 2, but the position of approximate estimation Partial Discharge Sources in transformer.The localization by ultrasonic measurement is the ultrasonic probe (gain is greater than 40dB) that adopts the high anti-interference ultra-high sensitive of maglev type, is contained in the special device, and the size of its magnetic force need satisfy this probe and can be adsorbed on securely on the iron plate plane.When carrying out the localization by ultrasonic measurement, maglev type ultrasonic probe 2 is adsorbed on tested oil tank of transformer surface, then the mode by the shelf depreciation electric measurement applies voltage to transformer.In case during the inner generation of transformer shelf depreciation, maglev type ultrasonic probe 2 all can measure the ultrasonic signal relevant with shelf depreciation and electric signal with the detection impedance.The travel-time of ignoring electric signal, trigger ultrasound positioning system work with electric signal, the measured ultrasonic signal of popping one's head in is transferred to ultrasound positioning system (being the partial discharge monitoring system), and ultrasound positioning system will be measured the travel-time t of ultrasonic signal from the Partial Discharge Sources to the detection probe.Discharge source can be drawn by s=vt to the distance of probe.In order to determine the locus of Partial Discharge Sources within Transformer, the maglev type ultrasonic probe 2(that need to install on the oil tank of transformer surface more than 3 is the ultrasonic probe of the high anti-interference ultra-high sensitive of maglev type).Because maglev type ultrasonic probe 2 riding positions are different, for same discharge source, the localization by ultrasonic measuring system will measure corresponding discharge source to maglev type ultrasonic probe 2 apart from s 1, s 2, s 3Deng.According to s 1, s 2, s 3Deng the survey data, utilize the space analysis geometric method can obtain the volume coordinate of Partial Discharge Sources.

Claims (5)

1. partial discharge of transformer on-line monitoring system, it is characterized in that, include Sensor monitoring unit (13) and site disposal device (3), described Sensor monitoring unit (13) includes a plurality of High Frequency Current Sensor (1) and a plurality of maglev type ultrasonic probe (2), described site disposal device (3) includes the signal condition unit (5) that connects successively by cable, A/D converting unit (6) and zigbee wireless transmission unit (8), a plurality of High Frequency Current Sensor (1) in the described Sensor monitoring unit (13) and the maglev type ultrasonic probe (2) of being connected are connected with signal condition unit (5) in the described site disposal device (3) by cable respectively, and the interior zigbee wireless transmission unit (8) of described site disposal device (3) is passed through the zigbee wireless network and is connected with background server (4).
2. partial discharge of transformer on-line monitoring system according to claim 1 is characterized in that, described High Frequency Current Sensor (1) is more than 3.
3. partial discharge of transformer on-line monitoring system according to claim 1 is characterized in that, described maglev type ultrasonic probe (2) is more than 3.
4. partial discharge of transformer on-line monitoring system according to claim 1, it is characterized in that, described signal condition unit (5) includes the fixed gain amplifier (9), wave filter (10), gain-programmed amplifier (11) and the vernier amplifier (12) that connect successively by cable.
5. partial discharge of transformer on-line monitoring system according to claim 4 is characterized in that, described wave filter (10) is programmable filter.
CN 201320117491 2013-03-14 2013-03-14 Transformer partial discharge on-line monitoring system CN203249989U (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103941164A (en) * 2014-04-10 2014-07-23 江苏骏龙电力科技股份有限公司 Portable intelligent dual-purpose electronic device for partial discharge and on-line monitoring of transformer
CN104007372A (en) * 2014-05-29 2014-08-27 深圳供电局有限公司 Device and method for locating cable partial discharge signals
CN104007373A (en) * 2014-05-29 2014-08-27 深圳供电局有限公司 Device and method for locating cable partial discharge signals
CN104267321A (en) * 2014-10-08 2015-01-07 国家电网公司 GIS state monitoring device based on Zigbee wireless networking
CN104808106A (en) * 2015-04-02 2015-07-29 广州供电局有限公司 Electrical equipment local discharge positioning method and system
CN105203931A (en) * 2015-09-11 2015-12-30 四川菲博斯科技有限责任公司 Transformer partial discharge monitoring and evaluation system
CN105842594A (en) * 2016-05-20 2016-08-10 国网河南省电力公司电力科学研究院 Intelligent supersonic wave partial discharge on-line monitoring system and monitoring method
CN106707128A (en) * 2017-03-16 2017-05-24 国家电网公司 Acoustoelectric associated local cable discharge locating device and method
CN107942205A (en) * 2017-09-20 2018-04-20 国网辽宁省电力有限公司检修分公司 A kind of independent multichannel Analysis of Partial Discharge platform
CN108680836A (en) * 2018-04-26 2018-10-19 天津大学 Multiple physical field based on high-frequency method couples paper oil insulation partial discharge detecting system
CN108693451A (en) * 2018-04-26 2018-10-23 天津大学 Compound field based on superfrequency method couples paper oil insulation partial discharge detecting system
CN108732471A (en) * 2018-04-26 2018-11-02 天津大学 Multiple physical field based on superfrequency method couples paper oil insulation partial discharge detecting system
CN108732472A (en) * 2018-04-26 2018-11-02 天津大学 Compound field based on high-frequency method couples paper oil insulation partial discharge detecting system
CN109406960A (en) * 2018-10-18 2019-03-01 国网黑龙江省电力有限公司电力科学研究院 A kind of partial discharge of transformer on-line detecting system and method based on wireless sensor

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103941164A (en) * 2014-04-10 2014-07-23 江苏骏龙电力科技股份有限公司 Portable intelligent dual-purpose electronic device for partial discharge and on-line monitoring of transformer
CN104007372A (en) * 2014-05-29 2014-08-27 深圳供电局有限公司 Device and method for locating cable partial discharge signals
CN104007373A (en) * 2014-05-29 2014-08-27 深圳供电局有限公司 Device and method for locating cable partial discharge signals
CN104267321A (en) * 2014-10-08 2015-01-07 国家电网公司 GIS state monitoring device based on Zigbee wireless networking
CN104808106A (en) * 2015-04-02 2015-07-29 广州供电局有限公司 Electrical equipment local discharge positioning method and system
CN105203931A (en) * 2015-09-11 2015-12-30 四川菲博斯科技有限责任公司 Transformer partial discharge monitoring and evaluation system
CN105842594A (en) * 2016-05-20 2016-08-10 国网河南省电力公司电力科学研究院 Intelligent supersonic wave partial discharge on-line monitoring system and monitoring method
CN106707128A (en) * 2017-03-16 2017-05-24 国家电网公司 Acoustoelectric associated local cable discharge locating device and method
CN107942205A (en) * 2017-09-20 2018-04-20 国网辽宁省电力有限公司检修分公司 A kind of independent multichannel Analysis of Partial Discharge platform
CN108680836A (en) * 2018-04-26 2018-10-19 天津大学 Multiple physical field based on high-frequency method couples paper oil insulation partial discharge detecting system
CN108693451A (en) * 2018-04-26 2018-10-23 天津大学 Compound field based on superfrequency method couples paper oil insulation partial discharge detecting system
CN108732471A (en) * 2018-04-26 2018-11-02 天津大学 Multiple physical field based on superfrequency method couples paper oil insulation partial discharge detecting system
CN108732472A (en) * 2018-04-26 2018-11-02 天津大学 Compound field based on high-frequency method couples paper oil insulation partial discharge detecting system
CN109406960A (en) * 2018-10-18 2019-03-01 国网黑龙江省电力有限公司电力科学研究院 A kind of partial discharge of transformer on-line detecting system and method based on wireless sensor

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