CN205484673U - A device for GIS partial discharge detector - Google Patents

A device for GIS partial discharge detector Download PDF

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Publication number
CN205484673U
CN205484673U CN201620225215.8U CN201620225215U CN205484673U CN 205484673 U CN205484673 U CN 205484673U CN 201620225215 U CN201620225215 U CN 201620225215U CN 205484673 U CN205484673 U CN 205484673U
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China
Prior art keywords
unit
signal
phase
partial discharge
antenna
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CN201620225215.8U
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Chinese (zh)
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汪磊
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Chengdu Ruiyi Information Technology Co Ltd
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Chengdu Ruiyi Information Technology Co Ltd
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Abstract

The utility model discloses a device for GIS partial discharge detector, including the probe antenna, local discharge signal processing device unit, reference signal processing unit and lock -in amplifier unit. The utility model discloses a probe the on -the -spot partial discharge signal of antenna collection GIS operation, enlarge through the local discharge signal processing device unit, filtering and fall frequently after export partial discharge channel signal to lock -in amplifier unit, with the probe the power frequency signal of antenna collection carries out correlated computation through the reference channel signal of reference signal processing unit output, obtain dc component's GIS partial discharge signal, thereby the faint local discharge signal processing device that will bury in a large amount of uncorrelated noise deeply comes out, the device has the broadband, low noise, high sensitivity and great dynamic range 's detection function, can further improve the performance of GIS partial discharge system.

Description

A kind of device for GIS partial discharge detection
Technical field
This utility model relates to power system GIS technology field, particularly relates to a kind of device for GIS partial discharge detection.
Background technology
Along with SF6 gas insulated combined electrical equipment (Gas Insulated Substation, the GIS) raising of importance in power system, whether it runs well has had influence on the safety of whole power system and has stablized.For ensureing that GIS runs reliably and with long-term, GIS is carried out on-line monitoring energy let us and understands and grasp the running status of GIS in time.Wherein, hyperfrequency sensing detection method is widely used in the on-line monitoring to GIS partial discharge owing to having the plurality of advantages such as high sensitivity.Uhf sensor is as the vitals in hyperfrequency sensing detection method, its performance will directly affect monitoring result, but owing to GIS runs on-the-spot electromagnetic interference problem, it is poor generally to there is anti-electromagnetic interference capability in current uhf sensor, the problems such as sensitivity is low, cause GIS partial discharge signal capture inaccurate.
Utility model content
For above-mentioned technical problem, the purpose of this utility model is to provide a kind of device for GIS partial discharge detection, this device application phase lock amplifying technology, the local discharge signal being submerged in much noise can be extracted, there is the detection function of broadband, low noise, high sensitivity and Larger Dynamic scope, and then improve the performance of GIS partial discharge system.
For reaching this purpose, this utility model by the following technical solutions:
A kind of device for GIS partial discharge detection, including probe-antenna, signal processing of partial discharge unit, reference signal processing unit and phase-locked amplifying unit;
Described probe-antenna electrically connects with signal processing of partial discharge unit input and reference signal processing unit input respectively, for being drawn by internal to power frequency component and GIS local discharge signal;
The internal local discharge signal of GIS that described signal processing of partial discharge unit is drawn for receiving transducer-antenna, and it is amplified, filters and exports after frequency reducing shelf depreciation channel signal to phase-locked amplifying unit;
The power frequency component that described reference signal processing unit is drawn for receiving transducer-antenna, and export reference channel signal to phase-locked amplifying unit after it is carried out phase shift, square wave drive;
Described phase-locked amplifying unit input electrically connects with signal processing of partial discharge unit outfan and reference signal processing unit outfan respectively, for local discharge channel signal and reference channel signal are carried out related operation, it is thus achieved that the GIS partial discharge signal of DC component;
Described signal processing of partial discharge unit includes amplifying unit, filter unit and microwave detection unit, described amplifying unit input is connected with probe-antenna electric, outfan electrically connects with filter unit input, local discharge signal for exporting probe-antenna is amplified, and will amplify after signal export filter unit;Described filter unit outfan electrically connects with microwave detection unit input, for the local discharge signal after amplifying is filtered, and filtering interference signals, and filtered signal is exported microwave detection unit;Described microwave detection unit outfan electrically connects with phase-locked amplifying unit input, for reducing the frequency of filtered signal, generates shelf depreciation channel signal, output to phase-locked amplifying unit;
Described phase-locked amplifying unit includes analog multiplier and low pass filter, the input of described analog multiplier electrically connects with microwave detection unit and square wave drive unit, outfan electrically connects with low pass filter, for local discharge channel signal and reference channel signal are carried out multiplying, and operation result is exported low pass filter;The described external computer of low pass filter outfan, for the AC signal after computing is filtered, it is thus achieved that the GIS partial discharge signal of DC component, output to external computer.
Especially, described reference signal processing unit includes phase-shifting unit and square wave drive unit, described phase-shifting unit input is connected with probe-antenna electric, outfan electrically connects with square wave drive unit input, ac signal for exporting probe-antenna carries out phase shift process, it is ensured that shelf depreciation channel signal is identical with reference channel signal phase;Described square wave drive unit outfan electrically connects with phase-locked amplifying unit input, for the ac signal after phase shift is transformed into square wave, generates reference channel signal, output to phase-locked amplifying unit.
Especially, the ac signal after phase shift is transformed into the square wave that dutycycle is 50% by described square wave drive unit.
Especially, described phase-shifting unit uses RC phase-shift circuit.
Especially, described amplifying unit uses amplifier chip model to be PC8211.
Especially, described microwave detection unit uses microwave detection chip model to be AD8.
Especially, described probe-antenna uses external probe-antenna.
The device for GIS partial discharge detection that the utility model proposes, probe-antenna gathers power frequency component and GIS runs on-the-spot local discharge signal, it is amplified through signal processing of partial discharge unit, shelf depreciation channel signal is exported to phase-locked amplifying unit after filtering and frequency reducing, the reference channel signal exported through reference signal processing unit with the power frequency component of probe-antenna collection carries out related operation, obtain the GIS partial discharge signal of DC component, output is to external computer, thus buried faint local discharge signal in a large amount of uncorrelated noises is detected, this device has broadband, low noise, the detection function of high sensitivity and Larger Dynamic scope, can further improve the performance of GIS partial discharge system.
Accompanying drawing explanation
Fig. 1 is the apparatus structure block diagram for GIS partial discharge detection that this utility model embodiment provides.
Detailed description of the invention
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.It is understood that specific embodiment described herein is used only for explaining this utility model, rather than to restriction of the present utility model.It also should be noted that, for the ease of describing, accompanying drawing illustrate only the part relevant to this utility model rather than full content, unless otherwise defined, all of technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present utility model are generally understood that.It is intended merely to describe the purpose of specific embodiment at term used in the description of the present utility model herein, it is not intended that in limiting this utility model.Term as used herein " and/or " include the arbitrary and all of combination of one or more relevant Listed Items.
Refer to shown in Fig. 1, Fig. 1 is the structured flowchart of the device for GIS partial discharge detection that this utility model embodiment provides.
In the present embodiment, the device for GIS partial discharge detection specifically includes: probe-antenna 101, signal processing of partial discharge unit 102, reference signal processing unit 103 and phase-locked amplifying unit 104.
Described probe-antenna 101 outfan electrically connects with signal processing of partial discharge unit 102, reference signal processing unit 103, and the local discharge signal that collection GIS operation is on-the-spot respectively exports the power frequency component of signal processing of partial discharge unit 102 and collection characteristic frequency and exports reference signal processing unit 103.Probe-antenna that hyperfrequency sensing method uses has two classes, one class is installed on inside GIS, another kind of employing external probes-antenna, the present embodiment uses external probes-antenna, it does not change the distribution of GIS internal electric field, do not affect the sealing of system, simultaneously conveniently moving, it is possible to complete GIS is run the collection of on-the-spot local discharge signal.
Described signal processing of partial discharge unit 102 specifically includes amplifying unit 1021, filter unit 1022 and microwave detection unit 1023.Described amplifying unit 1021 input electrically connects with probe-antenna 101, and outfan electrically connects with filter unit 1022 input;Described filter unit 1022 outfan electrically connects with microwave detection unit 1023 input;Described microwave detection unit 1023 outfan electrically connects with phase-locked amplifying unit 104 input.
Special construction based on GIS, frequency domain the abundantest (300MHZ-3GHZ) because of the ultrahigh frequency pulses electromagnetic wave that fault produces, and faint pulse signal is submerged in substantial amounts of noise, detection for the ease of being correlated with faint pulse local discharge signal processes, it must be carried out suitable amplification, in the present embodiment, the local discharge signal that probe-antenna 101 is exported by described amplifying unit 1021 is amplified, and will amplify after signal export filter unit 1022.Wherein, using amplifier chip model is PC8211.
GIS runs scene, interference source is many and interference signal amplitude is big, there is local discharge signal and extract the problem that difficulty is big, in the present embodiment, local discharge signal after amplifying is filtered by described filter unit 1022, the interference signals such as substantial amounts of corona in air are leached, and filtered signal is exported microwave detection unit 1023, it is simple to detection below processes.In order to be used in combination with antenna-probe 101, effectively removing low-frequency disturbance, filter unit 1022 uses high pass filter.
GIS electric discharge type is typically the peak value of local discharge signal and time domain operating frequency phase determined.In order to obtain peak value and the time domain power frequency information of local discharge signal, harvester needs have the highest sample rate, and needs to record substantial amounts of data, but googol is according to measuring extremely difficult real-time process.In the present embodiment, described microwave detection unit 1023 carries out detection process to filtered local discharge signal, the modulated signal of low frequency is taken out from high-frequency carrier signal, the hyperfrequency composition of uhf sensor output signal is filtered, and the only amplitude of stick signal and phase information, greatly reduce the process work of data volume, the envelope local discharge signal of final output low frequency, form shelf depreciation channel signal, output to phase-locked amplifying unit 104.Described microwave detection unit 1023 includes amplifying circuit and the peak-detector circuit that the microwave detecting circuit being made up of AD8XXX family device, AD8009 form.
Described reference signal processing unit 103 includes that phase-shifting unit 1031 and square wave drive unit 1032, described phase-shifting unit 1031 input electrically connect with probe-antenna 101, and outfan electrically connects with square wave drive unit 1032 input;Described square wave drive unit 1032 outfan electrically connects with phase-locked amplifying unit 104 input.
According to the requirement of phase-locked amplifying unit 104, shelf depreciation channel signal should be synchronize with the square wave of reference channel signal.In the present embodiment, phase-shifting unit 1031 obtains the specific power frequency component of probe-antenna 101 output, ensure the square-wave synchronous of shelf depreciation channel signal and reference channel signal, when the phase place of square wave frequency Yu shelf depreciation channel signal exist small asynchronous time, phase-shifting unit 1031 carries out phase shift process to square-wave signal, it is ensured that the requirement that two paths of signals synchronizes with frequency.In the present embodiment, phase-shifting unit uses RC phase-shift circuit.
Requirement according to phase-locked amplifying unit 104, reference channel signal can be sine wave, can also be square wave, for preventing the amplitude shift of reference channel signal from affecting the output accuracy of lock-in amplifier, in the present embodiment, reference channel signal uses dutycycle to be the square-wave signal of 50%.Ac signal after phase shift is transformed into square wave by described square wave drive unit 1032, generates reference channel signal, output to phase-locked amplifying unit 104.
Described phase-locked amplifying unit 104 includes that analog multiplier 1041 and low pass filter 1042, the input of described analog multiplier 1041 electrically connect with microwave detection unit 1023 and square wave drive unit 1032, and outfan electrically connects with low pass filter 1042 input;The described low pass filter 1042 external computer of outfan.
The essence of phase-locked amplifying unit detection small-signal is to have employed principle of correlation analysis, reference signal is utilized to have dependency with the useful signal of input, and reference signal is orthogonal with noise, is completed the computing of cross-correlation by phase sensitive detection and low-pass filtering, thus reach to suppress the purpose of noise.In the present embodiment, by two paths signal: a road is GIS partial discharge channel signal, one tunnel is that reference channel signal feeding analog multiplier 1041 carries out multiplying, part signal detection Tong Bu with reference channel signal in the signal of GIS local channel to be measured out, by low pass filter 1042 with integrating function below, AC signal is filtered afterwards, obtain the GIS partial discharge signal of DC component, output to external computer.
The technical solution of the utility model gathers power frequency component by probe-antenna and GIS runs on-the-spot local discharge signal, it is amplified through signal processing of partial discharge unit, shelf depreciation channel signal is exported to phase-locked amplifying unit after filtering and frequency reducing, the reference channel signal exported through reference signal processing unit with the specific power frequency component of probe-antenna collection carries out related operation, obtain the GIS partial discharge signal of DC component, output is to external computer, thus buried faint local discharge signal in a large amount of uncorrelated noises is detected, this device has broadband, low noise, the detection function of high sensitivity and Larger Dynamic scope, can further improve the performance of GIS partial discharge system.
Note, above are only preferred embodiment of the present utility model and institute's application technology principle.It will be appreciated by those skilled in the art that this utility model is not limited to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute without departing from protection domain of the present utility model.Therefore, although this utility model being described in further detail by above example, but this utility model is not limited only to above example, in the case of conceiving without departing from this utility model, other Equivalent embodiments more can also be included, and scope of the present utility model is determined by scope of the appended claims.

Claims (7)

1. the device for GIS partial discharge detection, it is characterised in that include probe-antenna, signal processing of partial discharge unit, reference signal processing unit and phase-locked amplifying unit;
Described probe-antenna electrically connects with signal processing of partial discharge unit input and reference signal processing unit input respectively, for being drawn by internal to power frequency component and GIS local discharge signal;
The internal local discharge signal of GIS that described signal processing of partial discharge unit is drawn for receiving transducer-antenna, and it is amplified, filters and exports after frequency reducing shelf depreciation channel signal to phase-locked amplifying unit;
The power frequency component that described reference signal processing unit is drawn for receiving transducer-antenna, and export reference channel signal to phase-locked amplifying unit after it is carried out phase shift, square wave drive;
Described phase-locked amplifying unit input electrically connects with signal processing of partial discharge unit outfan and reference signal processing unit outfan respectively, for local discharge channel signal and reference channel signal are carried out related operation, it is thus achieved that the GIS partial discharge signal of DC component;
Described signal processing of partial discharge unit includes amplifying unit, filter unit and microwave detection unit, described amplifying unit input is connected with probe-antenna electric, outfan electrically connects with filter unit input, local discharge signal for exporting probe-antenna is amplified, and will amplify after signal export filter unit;Described filter unit outfan electrically connects with microwave detection unit input, for the local discharge signal after amplifying is filtered, and filtering interference signals, and filtered signal is exported microwave detection unit;Described microwave detection unit outfan electrically connects with phase-locked amplifying unit input, for reducing the frequency of filtered signal, generates shelf depreciation channel signal, output to phase-locked amplifying unit;
Described phase-locked amplifying unit includes analog multiplier and low pass filter, the input of described analog multiplier electrically connects with microwave detection unit and square wave drive unit, outfan electrically connects with low pass filter, for local discharge channel signal and reference channel signal are carried out multiplying, and operation result is exported low pass filter;The described external computer of low pass filter outfan, for the AC signal after computing is filtered, it is thus achieved that the GIS partial discharge signal of DC component, output to external computer.
Device for GIS partial discharge detection the most according to claim 1, it is characterized in that, described reference signal processing unit includes phase-shifting unit and square wave drive unit, described phase-shifting unit input is connected with probe-antenna electric, outfan electrically connects with square wave drive unit input, ac signal for exporting probe-antenna carries out phase shift process, it is ensured that shelf depreciation channel signal is identical with reference channel signal phase;Described square wave drive unit outfan electrically connects with phase-locked amplifying unit input, for the ac signal after phase shift is transformed into square wave, generates reference channel signal, output to phase-locked amplifying unit.
Device for GIS partial discharge detection the most according to claim 2, it is characterised in that the ac signal after phase shift is transformed into the square wave that dutycycle is 50% by described square wave drive unit.
Device for GIS partial discharge detection the most according to claim 2, it is characterised in that described phase-shifting unit uses RC phase-shift circuit.
Device for GIS partial discharge detection the most according to claim 1, it is characterised in that described amplifying unit uses amplifier chip model to be PC8211.
Device for GIS partial discharge detection the most according to claim 1, it is characterised in that described microwave detection unit uses microwave detection chip model to be AD8.
Device for GIS partial discharge detection the most according to claim 1, it is characterised in that described probe-antenna uses external probe-antenna.
CN201620225215.8U 2016-03-23 2016-03-23 A device for GIS partial discharge detector Expired - Fee Related CN205484673U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106405171A (en) * 2016-08-29 2017-02-15 上海斐讯数据通信技术有限公司 Signal detection system
CN109100625A (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 A kind of detection circuit for partial discharge and detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106405171A (en) * 2016-08-29 2017-02-15 上海斐讯数据通信技术有限公司 Signal detection system
CN109100625A (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 A kind of detection circuit for partial discharge and detector

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Granted publication date: 20160817

Termination date: 20170323