CN105785242A - Sensor for partial discharge detection of gas insulated substation - Google Patents

Sensor for partial discharge detection of gas insulated substation Download PDF

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Publication number
CN105785242A
CN105785242A CN201610167150.0A CN201610167150A CN105785242A CN 105785242 A CN105785242 A CN 105785242A CN 201610167150 A CN201610167150 A CN 201610167150A CN 105785242 A CN105785242 A CN 105785242A
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China
Prior art keywords
unit
signal
phase
partial discharge
gas insulated
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Application number
CN201610167150.0A
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Chinese (zh)
Inventor
曾仰学
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Chengdu Ruiyi Information Technology Co Ltd
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Chengdu Ruiyi Information Technology Co Ltd
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Priority to CN201610167150.0A priority Critical patent/CN105785242A/en
Publication of CN105785242A publication Critical patent/CN105785242A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1254Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps

Abstract

The invention discloses a sensor for partial discharge detection of a gas insulated substation. The sensor comprises a probe-antenna, a partial discharge signal processing unit, a reference signal processing unit and a phase-locked amplification unit. Partial discharge signals of an operation site of the gas insulated substation are collected through the probe-antenna; after the signals are subjected to amplification, filtering and frequency reduction of the partial discharge signal processing unit, partial discharge channel signals are output to the phase-locked amplification unit; and then, correlation operation is carried out on the partial discharge channel signals and reference channel signals output after power frequency signals collected by the probe-antenna are processed by the reference signal processing unit to obtain DC component gas insulated substation partial discharge signals, so that weak partial discharge signals deeply buried in a lot of uncorrelated noises can be detected. The sensor has a wide-band, low-noise, high-sensitivity and large-dynamic-range detection function, and can further improve performance of a gas insulated substation partial discharge system.

Description

A kind of sensor for gas insulated transformer substation Partial Discharge Detection
Technical field
The present invention relates to sensor technical field, particularly relate to a kind of sensor for gas insulated transformer substation 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 gas insulated transformer substation runs reliably and with long-term, gas insulated transformer substation is carried out on-line monitoring energy let us and understands and grasp the running status of gas insulated transformer substation in time.Wherein, hyperfrequency sensing detection method is widely used in the on-line monitoring to gas insulated transformer substation shelf depreciation 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 gas insulated transformer substation 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 catching inaccurate to gas insulated transformer substation local discharge signal.
Summary of the invention
For above-mentioned technical problem, it is an object of the invention to provide a kind of sensor for gas insulated transformer substation Partial Discharge Detection, this sensor application phase lock amplifying technology, the local discharge signal being submerged in much noise can be extracted, make sensor have the detection function of broadband, low noise, high sensitivity and Larger Dynamic scope, and then improve the performance of gas insulated transformer substation shelf depreciation system.
For reaching this purpose, the present invention by the following technical solutions:
A kind of sensor for gas insulated transformer substation 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 gas insulated transformer substation local discharge signal;
The internal local discharge signal of gas insulated transformer substation 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 it is carried out phase shift, square wave exports reference channel signal to phase-locked amplifying unit after driving;
Described phase-locked amplifying unit input electrically connects with signal processing of partial discharge unit output and reference signal processing unit output respectively, for local discharge channel signal and reference channel signal are carried out related operation, it is thus achieved that the gas insulated transformer substation local 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, output 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 output 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 output 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.
Especially, described reference signal processing unit includes phase-shifting unit and square wave driver element, described phase-shifting unit input is connected with probe-antenna electric, output electrically connects with square wave driver element 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 driver element output 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 driver element.
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 sensor for gas insulated transformer substation Partial Discharge Detection that the present invention proposes, probe-antenna gathers power frequency component and gas insulated transformer substation 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 gas insulated transformer substation local 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, sensor is made to have broadband, low noise, the detection function of high sensitivity and Larger Dynamic scope, and then improve the performance of gas insulated transformer substation shelf depreciation system.
Accompanying drawing explanation
Fig. 1 is the sensor construction block diagram for gas insulated transformer substation Partial Discharge Detection that the embodiment of the present invention provides.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.It is understood that specific embodiment described herein is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that, for the ease of describing, illustrate only part related to the present invention in accompanying drawing rather than full content, unless otherwise defined, all of technology used herein is identical with the implication that the those skilled in the art belonging to the present invention are generally understood that with scientific terminology.The term used the most in the description of the invention is intended merely to describe the purpose of specific embodiment, it is not intended that in limiting the present invention.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 sensor construction block diagram for gas insulated transformer substation Partial Discharge Detection that the embodiment of the present invention provides.
In the present embodiment, the sensor for gas insulated transformer substation 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 output electrically connects with signal processing of partial discharge unit 102, reference signal processing unit 103, and the local discharge signal that the operation of collection gas insulated transformer substation is on-the-spot respectively exports the power frequency component of signal processing of partial discharge unit 102 and collection CF and exports reference signal processing unit 103.Probe-antenna that hyperfrequency sensing method uses has two classes, one class is installed on inside gas insulated transformer substation, another kind of employing external probes-antenna, the present embodiment uses external probes-antenna, it does not change the distribution of gas insulated transformer substation internal electric field, do not affect the sealing of system, simultaneously conveniently moving, it is possible to complete gas insulated transformer substation 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 output electrically connects with filter unit 1022 input;Described filter unit 1022 output electrically connects with microwave detection unit 1023 input;Described microwave detection unit 1023 output electrically connects with phase-locked amplifying unit 104 input.
Special construction based on gas insulated transformer substation, 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.
Gas insulated transformer substation 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.
Gas insulated transformer substation 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 driver element 1032, described phase-shifting unit 1031 input electrically connect with probe-antenna 101, and output electrically connects with square wave driver element 1032 input;Described square wave driver element 1032 output 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 driver element 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 driver element 1032, and output electrically connects with low pass filter 1042 input;The described low pass filter 1042 external computer of output.
The essence of phase-locked amplifying unit detection small-signal is to have employed principle of correlation analysis, reference signal is utilized to have correlation 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 LPF, thus reach to suppress the purpose of noise.In the present embodiment, by two paths signal: a road is gas insulated transformer substation shelf depreciation 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 gas insulated transformer substation local channel to be measured out, by low pass filter 1042 with integrating function below, AC signal is filtered afterwards, obtain the gas insulated transformer substation local discharge signal of DC component, output to external computer.
Technical scheme gathers power frequency component by probe-antenna and gas insulated transformer substation 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 gas insulated transformer substation local 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, sensor is made to have broadband, low noise, the detection function of high sensitivity and Larger Dynamic scope, and then improve the performance of gas insulated transformer substation shelf depreciation system.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that and the invention is not restricted 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 scope of the present invention.Therefore, although being described in further detail the present invention by above example, but the present invention is not limited only to above example, without departing from the inventive concept, other Equivalent embodiments more can also be included, and the scope of the present invention is determined by scope of the appended claims.

Claims (7)

1. the sensor for gas insulated transformer substation 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 gas insulated transformer substation local discharge signal;
The internal local discharge signal of gas insulated transformer substation 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 it is carried out phase shift, square wave exports reference channel signal to phase-locked amplifying unit after driving;
Described phase-locked amplifying unit input electrically connects with signal processing of partial discharge unit output and reference signal processing unit output respectively, for local discharge channel signal and reference channel signal are carried out related operation, it is thus achieved that the gas insulated transformer substation local 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, output 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 output 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 output 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.
A kind of sensor for gas insulated transformer substation 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 driver element, described phase-shifting unit input is connected with probe-antenna electric, output electrically connects with square wave driver element 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 driver element output 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.
A kind of sensor for gas insulated transformer substation 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 driver element.
A kind of sensor for gas insulated transformer substation Partial Discharge Detection the most according to claim 2, it is characterised in that described phase-shifting unit uses RC phase-shift circuit.
A kind of sensor for gas insulated transformer substation Partial Discharge Detection the most according to claim 1, it is characterised in that described amplifying unit uses amplifier chip model to be PC8211.
A kind of sensor for gas insulated transformer substation 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.
A kind of sensor for gas insulated transformer substation Partial Discharge Detection the most according to claim 1, it is characterised in that described probe-antenna uses external probe-antenna.
CN201610167150.0A 2016-03-23 2016-03-23 Sensor for partial discharge detection of gas insulated substation Withdrawn CN105785242A (en)

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Application Number Priority Date Filing Date Title
CN201610167150.0A CN105785242A (en) 2016-03-23 2016-03-23 Sensor for partial discharge detection of gas insulated substation

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Application Number Priority Date Filing Date Title
CN201610167150.0A CN105785242A (en) 2016-03-23 2016-03-23 Sensor for partial discharge detection of gas insulated substation

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Cited By (1)

* 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

Cited By (1)

* 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

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