CN101975912A - Transformer partial discharge on-line monitoring method and device - Google Patents
Transformer partial discharge on-line monitoring method and device Download PDFInfo
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- CN101975912A CN101975912A CN 201010278548 CN201010278548A CN101975912A CN 101975912 A CN101975912 A CN 101975912A CN 201010278548 CN201010278548 CN 201010278548 CN 201010278548 A CN201010278548 A CN 201010278548A CN 101975912 A CN101975912 A CN 101975912A
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Abstract
The invention discloses a transformer partial discharge on-line monitoring method which comprises the following steps of: (1) arranging a high-frequency current transformer and an ultrahigh-frequency transducer on a ground wire of an iron core, an outer shell or a clamping piece of a power transformer, wherein the high-frequency current transformer and the ultrahigh-frequency transducer are respectively used for coupling a signal flowing through the ground wire; (2) inputting output signals of the high-frequency current transformer and the ultrahigh-frequency transducer to a monitoring device, respectively detecting waves, maintaining amplitude and phase information after respectively subjected to digital-to-analogue conversion, and comparing; and (3) forming a monitoring signal in the monitoring device according to the analysis result so as to monitor the partial discharge of the transformer. The high-frequency current transformer and the ultrahigh-frequency transducer are installed on the ground wire of the iron core, the outer shell or the clamping piece so as to monitor discharge, the structure of the power transformer is not changed, thus the installation is convenient; meanwhile, the monitoring sensitivity is high and the anti-electromagnetic interference capability is strong. The invention also discloses a transformer partial discharge on-line monitoring device.
Description
Technical field
The present invention relates to power transformer a kind of monitoring method of shelf depreciation in normal working conditions, and the equipment of implementing this monitoring method.
Background technology
Shelf depreciation is the electric discharge phenomena in the regional area in the electric power transformer insulated structure, and this discharge just insulation is breakdown in subrange, and the penetrability puncture does not take place in insulation between conductor.If but the shelf depreciation long-term existence will cause transformer insulated destruction.So for the reliability that guarantees that transformer is in operation, need avoid the generation of shelf depreciation in the insulating medium usually, or only allow slight shelf depreciation as far as possible.Therefore, in service at power transformer, need carry out partial discharge monitoring, to guarantee insulation quality.
Partial discharge monitoring is under the power transformer running status, utilizes monitoring device to measure the inner contingent shelf depreciation of power transformer continuously or periodically automatically.Usually monitoring system fixedly mounts at the scene, and long-term on-line operation need not artificial participation, finishes functions such as detection, storage, communication and diagnosis automatically.
Be accompanied by the generation of electric power transformer insulated middle shelf depreciation, the transfer of discharge charge will form pulse signal in discharge loop, and produce the broadband electromagnetical radiation signal, therefore can detect discharge signal by pulse current and the spacing electromagnetic radiation that is flow through in the external circuit of measuring power transformer.Pulse current method is a kind of detection method for local discharge of routine, but has the advantage of quantitative measurment apparent discharge capacity, but has serious electromagnetic interference problem at the electric power scene, influences measurement sensitivity.And partial-discharge ultrahigh-frequency ELECTROMAGNETIC RADIATION SIGNATURE sensing has highly sensitive advantage, but needs when mounted to insert from fuel outlet valve, because of fuel outlet valve aperture reason, causes measurement effect undesirable, and the measuring position is subjected to very big restriction simultaneously.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, a kind of easy for installation, partial discharge of transformer on-line monitoring method that antijamming capability is strong is provided, and a kind of equipment of realizing this method is provided.
To achieve these goals, the technical solution used in the present invention is:
Partial discharge of transformer on-line monitoring method of the present invention comprises the steps:
(1) HF current transformer and superfrequency sensor are set on the ground wire of power transformer iron core, shell or folder, being used for is coupled respectively the flow through signal of ground wire;
(2) described HF current transformer and described superfrequency signal of sensor are input to monitoring device, two output signals are carried out earlier detection respectively and are handled in monitoring device, after digital-to-analog conversion, keep amplitude and phase information more respectively, compare then, if there is the signal above setting threshold simultaneously in two output signals, judge that then this signal is that local discharge signal is kept, otherwise judge that then this signal is that undesired signal is eliminated;
(3) in monitoring device, form monitor signal so that be used for monitoring the shelf depreciation of transformer according to above-mentioned analysis result.
As the preferred embodiment of technique scheme, the frequency band of described high frequency sensors is 100kHz～10MHz, and the frequency band of described superfrequency sensor is 300MHz～1GHz.
Partial discharge of transformer on-line monitoring equipment of the present invention, comprise and be installed in power transformer iron core, HF current transformer on the ground wire of shell or folder and superfrequency sensor, and the monitoring device that links to each other with the signal output part of described HF current transformer and described superfrequency sensor, described monitoring device comprises wave detector, analog to digital converter and signal analyzer, described wave detector is used for described HF current transformer and described superfrequency signal of sensor are carried out the detection processing respectively, described analog to digital converter is used for the output signal after the detection processing is carried out analog to digital conversion respectively and kept amplitude and phase information, described signal analyzer is used for two output signals after the analog to digital converter processing are compared, if there is the signal above setting threshold simultaneously in two output signals, judge that then this signal is that local discharge signal is kept, otherwise judge that then this signal is that undesired signal is eliminated; Described monitoring device forms monitor signal so that be used for monitoring the shelf depreciation of transformer according to described signal analyzer.
As the preferred embodiment of technique scheme, the frequency band of described high frequency sensors is 100kHz～10MHz, and the frequency band of described superfrequency sensor is 300MHz～1GHz.
Compared with prior art, advantage of the present invention is: HF current transformer and superfrequency sensor are installed in the monitoring of discharging on the iron core grounding line of iron core, shell or folder, do not change the structure of power transformer, and easy for installation; And, the monitoring sensitivity height, anti-electromagnetic interference capability is strong.
Description of drawings
Fig. 1 is the power transformer structural representation;
Fig. 2 is the synoptic diagram that the embodiment of the invention is carried out partial discharge monitoring;
Fig. 3 is the illustrative view of functional configuration of embodiment of the invention monitoring device;
Fig. 4 is the synoptic diagram that the embodiment of the invention disturb to suppress, the output signal of Fig. 4 (a) after for the detection processing, and Fig. 4 (b) is the monitor signal after the interference eliminated.
Description of reference numerals:
Partial Discharge Sources in 11-iron core, 12-coil winding, the 13-winding, 14-transformer case, 15-winding outlet sleeve pipe, 16-iron core grounding line outlet sleeve pipe, 17-iron core grounding line, 18-superfrequency sensor, 19-HF current transformer, 20-monitoring device, 201-wave detector, 202-analog to digital converter, 203-signal analyzer.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated:
Fig. 1 is the structural representation of power transformer.11 is unshakable in one's determination among Fig. 1, and 12 is coil winding, and 13 is the Partial Discharge Sources in the winding, and 14 is transformer case, and 15 is winding outlet sleeve pipe, and 16 is iron core grounding line outlet sleeve pipe, and 17 is the iron core grounding line.It is external that iron core grounding line 17 is drawn out to transformer by iron core grounding line outlet sleeve pipe 16, then external ground connection.When shelf depreciation appearred in transformer inside, local discharge signal was coupled on the iron core grounding line 17.
Shown in Figure 2 is the synoptic diagram of partial discharge monitoring of the present invention, and 14 is transformer case among the figure, and 16 is iron core grounding line outlet sleeve pipe, and 17 is the iron core grounding line, and 18 is the superfrequency sensor, and 19 is HF current transformer, and 20 is monitoring device.High-frequency pulse signal and superfrequency ELECTROMAGNETIC RADIATION SIGNATURE that the inner shelf depreciation of power transformer produces are coupled on the transformer core 11, again through iron core grounding line 17 from the transformer internal communication to the transformer outside.High-frequency signal and ultrahigh-frequency signal for the shelf depreciation generation, iron core grounding line 17 can be considered a transmission line, on the external iron core grounding line 17 of transformer shell, select two measuring points, any is positioned at the leading-out terminal of iron core grounding thread casing 16, at this position installing superfrequency sensor 18, another some installing HF current transformer 19, superfrequency sensor 18 and HF current transformer 19 are measured the shelf depreciation coupled signal at measuring point place respectively.The signal output part of superfrequency sensor 18 and HF current transformer 19 links to each other with the signal input part of monitoring device 20.
The functional structure of monitoring device 20 as shown in Figure 3, wherein 201 is wave detector, 202 is analog to digital converter, 203 is signal analyzer.20 pairs of output signals from superfrequency sensor 18 and HF current transformer 19 outputs of monitoring device are carried out synchronous monitoring, the output signal of superfrequency sensor 18 and HF current transformer 19 is carried out the detection processing through wave detector 201 respectively earlier, and the detection time constant is less than 20S.Carry out analog-to-digital conversion process and keep amplitude and phase information through analog to digital converter 203 respectively again.The inner shelf depreciation that produces of transformer can induce high-frequency signal and ultrahigh-frequency signal simultaneously on iron core grounding line 17; And outside all kinds of interference source is because the restriction of coupling path can only produce response signal in the single signalling channel of HF current transformer or superfrequency sensor.Signal analyzer 203 is by the output signal of contrast after detection and analog to digital conversion, shown in Fig. 4 (a).When 20S, in the window scope,, assert that then this signal is that local discharge signal is kept if there is the signal above setting threshold simultaneously in both; If only have the rectified signal that surpasses setting threshold, assert that then this signal is that undesired signal is eliminated at a monitoring channel.Can obtain final partial discharge of transformer monitor signal thus, shown in Fig. 4 (b).Threshold value is 50～100% of a basic noise figure, and basic noise figure is meant the ground unrest value that does not occur under the discharge scenario.
Be specific embodiments of the invention only below, do not limit protection scope of the present invention with this; Any replacement and the improvement done on the basis of not violating the present invention's design all belong to protection scope of the present invention.
Claims (4)
1. a partial discharge of transformer on-line monitoring method is characterized in that comprising the steps:
(1) HF current transformer and superfrequency sensor are set on the ground wire of power transformer iron core, shell or folder, being used for is coupled respectively the flow through signal of ground wire;
(2) described HF current transformer and described superfrequency signal of sensor are input to monitoring device, two output signals are carried out earlier detection respectively and are handled in monitoring device, again respectively through digital-to-analog conversion and keep amplitude and phase information, compare then, if there is the signal above setting threshold simultaneously in two output signals, judge that then this signal is that local discharge signal is kept, otherwise judge that then this signal is that undesired signal is eliminated;
(3) in monitoring device, form monitor signal so that be used for monitoring the shelf depreciation of transformer according to above-mentioned analysis result.
2. partial discharge of transformer on-line monitoring method according to claim 1 is characterized in that: the frequency band of described high frequency sensors is 100kHz～10MHz, and the frequency band of described superfrequency sensor is 300MHz～1GHz.
3. partial discharge of transformer on-line monitoring equipment, it is characterized in that: comprise being installed in power transformer iron core, HF current transformer on the ground wire of shell or folder and superfrequency sensor, and the monitoring device that links to each other with the signal output part of described HF current transformer and described superfrequency sensor, described monitoring device comprises wave detector, analog to digital converter and signal analyzer, described wave detector is used for described HF current transformer and described superfrequency signal of sensor are carried out the detection processing respectively, described analog to digital converter is used for the output signal after the detection processing is carried out analog to digital conversion respectively and kept amplitude and phase information, described signal analyzer is used for two output signals after the analog to digital converter processing are compared, if there is the signal above setting threshold simultaneously in two output signals, judge that then this signal is that local discharge signal is kept, otherwise judge that then this signal is that undesired signal is eliminated; Described monitoring device forms monitor signal so that be used for monitoring the shelf depreciation of transformer according to described signal analyzer.
4. partial discharge of transformer on-line monitoring equipment according to claim 3 is characterized in that: the frequency band of described high frequency sensors is 100kHz～10MHz, and the frequency band of described superfrequency sensor is 300MHz～1GHz.
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| CN 201010278548 CN101975912A (en) | 2010-09-09 | 2010-09-09 | Transformer partial discharge on-line monitoring method and device |
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| CN 201010278548 CN101975912A (en) | 2010-09-09 | 2010-09-09 | Transformer partial discharge on-line monitoring method and device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841297A (en) * | 2012-09-10 | 2012-12-26 | 许昌学院 | Self-adaptive partial-discharge monitoring method and device for sampling frequency |
| CN103529370A (en) * | 2013-10-30 | 2014-01-22 | 国家电网公司 | Partial discharge detection method for high-voltage switch cabinet |
| CN103560484A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Multipoint ground-connection current control device for three current transformers to monitor transformer clamping parts in online mode |
| CN107505540A (en) * | 2016-06-14 | 2017-12-22 | Ls 产电株式会社 | Diagnostic system for power equipment |
| CN109100626A (en) * | 2018-10-29 | 2018-12-28 | 国网河北省电力有限公司电力科学研究院 | Transformer high frequency partial discharge band power detection signal acquisition device |
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| US4967158A (en) * | 1989-03-31 | 1990-10-30 | Hydro-Quebec | Portable detector device for detecting partial electrical discharge in live voltage distribution cables and/or equipment |
| CN101750573A (en) * | 2009-12-07 | 2010-06-23 | 上海市电力公司 | Portable cable local discharge detection device |
| CN201765301U (en) * | 2010-09-09 | 2011-03-16 | 广东电网公司中山供电局 | Online monitor apparatus for partial discharge of transformer |
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2010
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| US4967158A (en) * | 1989-03-31 | 1990-10-30 | Hydro-Quebec | Portable detector device for detecting partial electrical discharge in live voltage distribution cables and/or equipment |
| CN101750573A (en) * | 2009-12-07 | 2010-06-23 | 上海市电力公司 | Portable cable local discharge detection device |
| CN201765301U (en) * | 2010-09-09 | 2011-03-16 | 广东电网公司中山供电局 | Online monitor apparatus for partial discharge of transformer |
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| 《高电压技术》 20040731 王晓宁等 基于UHF和HF的局部放电降噪方法的研究 27-30 1-4 第30卷, 第27期 2 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841297A (en) * | 2012-09-10 | 2012-12-26 | 许昌学院 | Self-adaptive partial-discharge monitoring method and device for sampling frequency |
| CN102841297B (en) * | 2012-09-10 | 2015-01-28 | 许昌学院 | Self-adaptive partial-discharge monitoring method and device for sampling frequency |
| CN103529370A (en) * | 2013-10-30 | 2014-01-22 | 国家电网公司 | Partial discharge detection method for high-voltage switch cabinet |
| CN103529370B (en) * | 2013-10-30 | 2016-08-17 | 国家电网公司 | A kind of partial discharge detection method for high-voltage switch cabinet |
| CN103560484A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Multipoint ground-connection current control device for three current transformers to monitor transformer clamping parts in online mode |
| CN103560484B (en) * | 2013-11-02 | 2015-11-25 | 国家电网公司 | Three current transformer on-line monitoring multipoint earthing of clamping piece of transformer current control devices |
| CN107505540A (en) * | 2016-06-14 | 2017-12-22 | Ls 产电株式会社 | Diagnostic system for power equipment |
| CN107505540B (en) * | 2016-06-14 | 2019-12-27 | Ls 产电株式会社 | Diagnostic system for electrical equipment |
| US10571504B2 (en) | 2016-06-14 | 2020-02-25 | Lsis Co., Ltd. | Diagnostic system for electric power equipment |
| CN109100626A (en) * | 2018-10-29 | 2018-12-28 | 国网河北省电力有限公司电力科学研究院 | Transformer high frequency partial discharge band power detection signal acquisition device |
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Application publication date: 20110216 |