CN109490724A - 10kV on-pole switch charges partial discharge test piezoelectric type detector of sound - Google Patents
10kV on-pole switch charges partial discharge test piezoelectric type detector of sound Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing 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
- G01R31/1209—Testing 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 using acoustic measurements
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Abstract
The invention discloses a kind of 10kV on-pole switch to charge partial discharge test piezoelectric type detector of sound, including piezoelectric element, fixing seat, shell, the fixing seat and piezoelectric element are set in shell, the piezoelectric element includes two piezoelectric ceramic wafers being stacked and the glued sheet metal being fixed between two piezoelectric ceramic wafers, the sheet metal extends to other than piezoelectric ceramic wafer, the surface of the piezoelectric ceramic wafer is coated with layer of surface electrode, the surface electrode is connect through conducting wire with output electrode, it is connected in the center portion combined axis of piezoelectric element with coniform cone of pushing to, the piezoelectric element is fixed on fixed pedestal in the form of simple supported edge, the top of the metal shell is equipped with chain link fence.The sensor structure that the present invention designs be open type, have many advantages, such as high sensitivity, it is small in size, be easy to make.
Description
Technical field
The present invention relates to the shelf depreciation measuring technology of the livewire work in middle pressure field, especially a kind of middle compression leg upper switch
Charge shelf depreciation test piezoelectric type detector of sound.
Background technique
10kV on-pole switch equipment significance level is higher, and 10kV on-pole switch is segmented generally as main line, contact or big
The incoming switch of load user, failure or the influence more normal power supply for possibly even influencing whole route of user that has a power failure.Hair
The reliable power supply that user is influenced when raw failure, to user's production and the power supply of power supply enterprise at greater loss.
10kV on-pole switch installation site and device are special: 1), liftoff height, make an inspection tour, maintenance it is difficult: 10kV on-pole switch peace
Loaded on outdoor aerial route cement pole, installation site is higher, general liftoff in 9m or more, State Grid Corporation of China's " distribution fortune
Professional etiquette journey " Q/GDW519-2010 require overhead transmission line column on electrical equipment the densely populated areas such as urban district installation site must not
Lower than 9m.Personnel can not clearly check the state of on-pole switch equipment with naked eyes on the ground when tour, make an inspection tour relatively difficult.Together
When due to installation site it is higher, it is closer from electrical body, when maintenance route and equipment must have a power failure, personnel must upper boom operation, it is difficult
It spends larger.2), 10kV on-pole switch equipment is small, and operating mechanism gap is small inside equipment, and only 10cm~20cm is unsatisfactory for 10kV
Electrical safety required distance, it is necessary to effectively be insulated using the vacuum or SF6 gas of sealing.And due to 10kV on-pole switch
It is generally loaded on field, site environment is complicated, it is necessary to be sealed to equipment, cause only can not effectively judge equipment shape with naked eyes
State.10kV on-pole switch must have side to charge always generally as overhead transmission line breaking operation, and equipment is caused to be in electrification always
State, personnel must not directly touch equipment.
Partial Discharge Detection has electrical measuring method and non-electrical measuring method by the physical quantity property point of detection at present, according to shelf depreciation mistake
It is generated various in electric discharge phenomena in journey, occur Electromagnetic Wave Detection method (TEV method), ultrasonic Detection Method, flash ranging accordingly
The detection methods such as method, Infrared Detection Method, chemical measure, radio frequency detection method, wherein TEV method and ultrasonic Detection Method are using the most
Extensively.
Summary of the invention
The present invention provides a kind of 10kV on-pole switch to charge partial discharge test piezoelectric type detector of sound, improves the spirit of detection
Sensitivity.
In order to solve the above technical problems, the present invention adopts the following technical scheme: the electrification partial discharge test of 10kV on-pole switch is used
Piezoelectric type detector of sound, including piezoelectric element, fixing seat, shell, the fixing seat and piezoelectric element are set in shell, the pressure
Electrical component includes two piezoelectric ceramic wafers being stacked and the glued sheet metal being fixed between two piezoelectric ceramic wafers,
The sheet metal extends to other than piezoelectric ceramic wafer, and the surface of the piezoelectric ceramic wafer is coated with layer of surface electrode, institute
It states surface electrode and is connect through conducting wire with output electrode, connected in the center portion combined axis of piezoelectric element and coniform cone of pushing to
Integrally, the piezoelectric element is fixed on fixed pedestal in the form of simple supported edge, and the top of the metal shell is equipped with metal
Protective net,.
Preferably, the sheet metal is fixed with piezoelectric ceramic wafer using Low-temperature epoxy resinoid bond.
Preferably, the surface electrode is incorporated in piezoelectric ceramic wafer surface using the method for surface evaporation plated film.
Preferably, the centre frequency of the piezoelectric type detector of sound is 40kHz, sensitivity about -65dB.
The present invention is directed to reception sensor, expects to have lower impedance value, to receive weaker acoustical signal and defeated
Biggish voltage signal out, therefore, by test of many times and comparison, the sensor structure of design is open type, has sensitivity
It is high, small in size, be easy to the advantages that making.
In order to improve sensor mechanical performance and mechanical-electric coupling and structure installation convenience, two piezoelectric ceramics crystalline substance
Glued piece of metal thin slice between piece, for the ease of supporting and being electrically connected, sheet metal extend to piezoelectric ceramic wafer with
Outside.
Piezoelectric element is fixed in the form of simple supported edge on the base, in the center portion combined axis and circular cone of piezoelectric element
The cone of pushing to of shape is connected, and pushing cone to can effectively concentrate on acoustic pressure the center of piezo-electric crystal, improves connecing for sensor
Receive sensitivity.Above-mentioned component is all placed in metal shell, the front end groups of metal filaments of metal shell at protective net generation
It replaces, sound wave is enable to be incident on piezoelectric ceramics.
Detailed description of the invention
Present invention will be further described below with reference to the accompanying drawings and specific embodiments:
Fig. 1 is the structural schematic diagram of piezoelectric type detector of sound;
Fig. 2 is inside switch cabinet discharge examination positioning schematic.
Specific embodiment
10kV on-pole switch electrification partial discharge test method of the present invention is specifically described below, includes the following steps:;
S1 tests environment amplitude using partial discharge test equipment;
S2 carries out transient state voltage-to-ground to 10kV on-pole switch using partial discharge test equipment and detects;
S3 carries out ultrasound examination to 10kV on-pole switch using partial discharge test equipment;
Carry out when S4, discovery are to transient state voltage-to-ground or excessively high ultrasonic wave and is accurately positioned;
S5 analyzes test data, determines equipment state.
Before testing, Live working Aerial Device is unfolded near 10kV on-pole switch installation point cement pole, tester's wearing is exhausted
Edge clothes, insulating glove carry instrument and enter insulation bucket arm, carry out detection and prepare.Specifically utilize Live working Aerial Device by tester
Member send to on-pole switch side 1m left-right position.
Switchgear interior insulation defect will lead to the generation of partial discharge phenomenon, switchgear generate shelf depreciation can occur sound,
The physical and chemical changes such as light, electricity, heat.These features all can be used as the sensing objects of Partial Discharge Detection signal.
Surface-discharge, which generates sound wave, has scattering in each frequency range.Audible acoustic detection depends on personal hearing.
It is advantageous using ultrasonic wave part in instrument detection sound spectrum.Instrument is more ear-sensitive than people, independent of operator, detection
Most efficient method is using a ultrasonic sensor, and main frequency is about in 40kHz.This method is carrying out surface-discharge
Detection when be very successfully.
When internal discharge and corona discharge occur for switchgear insulating part, electromagnetic wave will be generated, these electromagnetic waves pass through
Channel between switchgear metal shell blazes abroad, these channels may be interval, liner or the other insulation between metal shell
Component when electromagnetic wave spreads out of metal cabinet, while generating a transient state voltage-to-ground on the metal cabinet of switchgear
(TEV), transient state voltage-to-ground (TEV) only has several volts and can only maintain several nanoseconds (ns).It can be set by switch in operation
The internal discharge and corona discharge situation for placing a TEV detector in the outer box shell of standby metal to test in switchgear.
The most successful detection method of surface-discharge is using ultrasonic technology, and the TEV signal that surface-discharge issues is than interior
It discharges much smaller in portion.In addition, electromagnetic wave signal frequency caused by surface-discharge is also than the detection frequency of TEV equipment
It is low, this is because caused by the different reason of flash-over characteristic, in many cases, it will not detected by TEV sensor, because
It is lower than background value for this electromagnetic signal.
1, TEV testing principle: inside switchgear solid insulating material, due to some small gaps of extraneous factor insulating part.
In use, insulator one end is grounded, a terminated high voltage, so that these small gaps are equally charged as small capacitances, when being charged to
When to a certain degree, they just discharge, while generating various physics, chemical phenomenon, such as the exchange of charge, emit electromagnetic wave, fever,
Decomposition product carbon etc. is generated, increasing carbon will lead to gap conducting, and the electric pressure by increasing action in adjacent gap repeats
The above process finally results in insulation breakdown.It is passed by the metal product that the electromagnetic impulse that electric discharge generates largely passes through surrounding
Output is gone, while generating a transient voltage, these voltage pulses are transient state voltage-to-ground (TEV).Studied this TEV letter
Number directly to same model, same position measurement the insulation status of insulator of equipment it is directly proportional.According to this principle, come
Realization detects the internal discharge situation of equipment.
2, ultrasonic wave (Ultrasonic) testing principle: insulating materials surface can be in insulation material because of reasons such as dust humidities
Expect that surface forms surface-discharge, it is electric energy with sound that from the perspective of energy, electric discharge, which is the process of an energy prompt explosion,
The process that the forms such as energy, luminous energy, thermal energy, electromagnetic energy discharge, when electrical breakdown occurring in the air gap, electric discharge is instantaneous complete
At electric energy instantaneous conversion is the expansion of thermal energy guiding discharge center gas, and this result instantaneously expanded is in the form of a sound wave
It blazes abroad, is exactly initial sound source, with initial Acoustic Wave Propagation, the gas in propagation regions is heated, and forms one etc.
Warm area, temperature are higher than environment temperature, and when these gas coolings, gas starts to shrink again, and the result of contraction is exactly compared with low frequency
The subsequent wave of rate and intensity, it can be audible sound wave or ultrasonic wave.Ultrasonic wave refers to that vibration frequency is greater than 20KHz or more,
The sound wave that people can not hear and experience in a natural environment.Then heterodyne method (Heterodyning) is utilized, by what is be received
Signal be converted into a human ear can differentiate, audible voice signal, and will discharge caused by ultrasonic wave size with voltage (dB
μ V) form show, user by analysis earphone in transmit electric discharge sound and display screen on acoustic pressure size come
Judge inside switch cabinet with the presence or absence of surface discharge phenomena.
Heterodyne method principle is like radio, ultrasonic signal accurately can be converted into sound, people is allowed easily to distinguish
Recognize and understands.Sensor receives ultrasonic signal, after host frequency-selecting, selects and wants received ultrasonic signal.Meanwhile
In host, there is a local oscillator, generates one with receiving the much the same local oscillation signal of frequency, it is mixed with receiving signal,
Difference frequency is generated, this difference frequency is exactly intermediate-freuqncy signal.Intermediate-freuqncy signal is amplified using frequency-selecting of intermediate frequency, and then detection again, just obtains
Audio signal originally.Audio signal passes through after power amplification, so that it may send to earphone sounding.
Since the size of acoustic monitoring method and acoustical signal has much relations, it is therefore necessary to have very high sensitivity, ability
The faint acoustical signal for starting to generate when electric discharge is captured, while false alarm cannot be caused by the interference of noise again.In order to reach
To the purpose that do not interfered by outside noise, the frequency range taken must avoid the frequency range of audible sound, i.e. 20Hz -20kHz,
So the acoustical signal that frequency should be taken to be greater than 20kHz, i.e. ultrasonic wave.
Existing research achievement shows that its frequency spectrum is very since the discharge time each time of surface-discharge is all very short
Width, the acoustical signal spectrum that corresponding electric discharge generates is also very wide, and spectral range is from hundreds of hertz to several megahertzs.The test having from oneself
As a result from the point of view of, the spectrum component of acoustic emission signal is concentrated mainly between 20kHz -150kHz, in order to improve sensitivity, Ying Xuan
The maximum frequency of spectrum component is selected, so frequency should consider further that signal frequency is higher, in air in 20kHz -150kHz
Decaying when middle propagation is bigger, and this technology has selected centre frequency of this frequency of 40kHz as sensor.
Ultrasonic sensor uses piezoelectric type sonic transducer in the present invention, and the vibration mode of piezo-electric crystal uses bending vibration
Dynamic, because the structure of bending vibration PZT (piezoelectric transducer) is simple, size is small, light-weight, electromechanical coupling factor is high, and Q value is high, be easy to
Air matching.
Refering to what is shown in Fig. 1,10kV on-pole switch electrification partial discharge test piezoelectric type detector of sound, including it is piezoelectric element, solid
Reservation 6, shell 2, the fixing seat and piezoelectric element are set in shell, and the piezoelectric element includes the two piezoelectricity potteries being stacked
Porcelain chip 5 and the glued sheet metal 4 being fixed between two piezoelectric ceramic wafers, the sheet metal extend to piezoelectric ceramics
Other than chip, the surface of the piezoelectric ceramic wafer is coated with layer of surface electrode, and the surface electrode is through conducting wire and output electrode 7
Connection is connected in the center portion combined axis of piezoelectric element with coniform cone 3 of pushing to, and the piezoelectric element is with freely-supported
The form on side is fixed on fixed pedestal, and the top of the metal shell is equipped with chain link fence 1.
Wherein, the sheet metal is fixed with piezoelectric ceramic wafer using Low-temperature epoxy resinoid bond.The surface electrode
Piezoelectric ceramic wafer surface is incorporated in using the method for surface evaporation plated film.The centre frequency of the piezoelectric type detector of sound is
40kHz, sensitivity about -65dB.
Generally there are three types of forms for the processing on piezo-electric crystal boundary: A, folder is aided the border areas, and boundary rigidly fixes;B, simple supported edge, side
It is clamped with blade on boundary;C, free margins, boundary are under no restraint.It is extremely low to press from both sides the electromechanical lotus root conjunction aided the border areas, the spirit of sensor can be reduced
Sensitivity, therefore not use;The installation of free margins structure is inconvenient, can not use;It is simple supported edge portable construction, solid, and fill
The loss set is reduced to minimum level, is supported by most commonly used boundary.What is used in this technique is also simple supported edge structure.
After the boundary of piezo-electric crystal and piezo-electric crystal has been determined, it is also necessary to design the overall structure of sensor.For connecing
The sensor of receipts always expects to have lower impedance value, to receive weaker acoustical signal and to export biggish voltage signal.
The overall structure types of sensor are very big on receptivity influence, by test of many times and comparison, devise sensor.Sensor
Structure is open type, have many advantages, such as high sensitivity, it is small in size, be easy to make.
In order to improve sensor mechanical performance and mechanical-electric coupling and structure installation convenience, between two potsherds
Glued piece of metal thin slice.For the ease of supporting and being electrically connected, sheet metal is extended to other than piezoelectric ceramic piece.Once piezoelectricity
Any sliding of appearance between layers of ceramics and sheet metal, it will significantly reduce the performance of sensor, therefore cementing layer wants non-
It is often thin, firm and stable.Gluing between metal and ceramics, using Low-temperature epoxy resin, since the thickness of cementing layer is to sensing
The frequency of device can have an impact, and must apply in Curing Process of Epoxy with pressure appropriate, make cementing layer uniformly, in conjunction with tight
It is close.The surface of piezoelectric ceramics is coated with one layer of metallic conductor, that is, electrode.When acoustic pressure acts on piezoelectric ceramics, in piezoelectricity
The charge that ceramic surface generates is bound charge, cannot be read by circuit, bound charge is changed into free electricity by the effect of electrode
Lotus, to be read by circuit.Metal electrode must be closely linked with piezoelectric ceramics, so using surface evaporation plated film
Method.Surface electrode is connect through conducting wire with output electrode.Piezoelectric element is fixed in the form of simple supported edge on the base, in piezoelectricity
The center portion combined axis of component is connected with coniform cone of pushing to, and pushing cone to can effectively concentrate on pressing by acoustic pressure
The receiving sensitivity of sensor is improved at the center of transistor.Above-mentioned component is all placed in metal shell, metal shell
Front end with groups of metal filaments at protective net replace, so that sound wave is incident on piezoelectric ceramics.
The exclusion of positioning and the interference of partial discharge.
Refering to what is shown in Fig. 2, positioning determines the position of discharge activities according to TEV signal elapsed time, principle is to adopt
The time required for each sensor is arrived separately at TEV signal is compared, positioning system indicates which sensor is first triggered, into
And show that this sensor is closer from the electrical distance of point of discharge.
The accurate positioning method of step S4 are as follows: the located lateral of first switchgear, when two sensors trigger simultaneously, say
Bright discharge position is on the middle line of two sensors, and similarly, we position in the longitudinal direction of switchgear, same to determine in one
Line, the intersection point of two middle lines are exactly the specific location of shelf depreciation.But we are it is noted that the following in the detection process:
Sometimes two sensor-triggereds are unstable, make us not judge.Occur such case the reason of first is that two
The time phase difference very little that signal on sensor arrives at, has been more than the resolution ratio of positioning system.It is also likely to be since two sense
Caused by being equidistant of device and point of discharge.As long as slightly moving any one sensor, positioning system can be separated
It is which sensor is first triggered.
It is remotely the presence of strong discharge activities from measurement position there are also a kind of situation.Due to declining for signal high fdrequency component
Subtract, signal is distorted in the forward position of waveform after the transmission of relatively long distance.And the because speed that signal different frequency component is propagated
It spends slightly different, causes the forward position of waveform further to distort, positioning system is made to be difficult to differentiate between which sensor is first triggered.Noise
Interference also results in positioning system judgement and randomness occurs, has especially decayed after multiple reflections in signal energy very much
In the case of.
If the electrical centre point position between two sensors is between two (or multiple) point of discharges, and center position
Right side in the right point of discharge, then the detector on the left side will be triggered first always, vice versa.Therefore, when there is many places electric discharge
When point, it can be found that the channel indicator light of two detectors is all bright in some particular detection region, and sensor once goes out
This region can significantly extraction of signal it is successive.This specific region is usually exactly the distribution of point of discharge.
The exclusion of interference:
Distinguishing interference, there are many methods.The electric discharge triggered time interval detected shows distinctive randomness.Due to electricity
The interference triggering of gas or electronic equipment is distinguishable to be come out, because it is regular or with certain periodically just as radio
Signal transmitting, electric drill, the phone of during dialing, process automobile issue signal it is the same.
Usual pot life difference technology finds out signal propagation direction to determine and interfere with equipment under test electric discharge apart from each other
Source.The interference signal of distant place can also be distinguished from comparator probe in the signal intensity that different location measures.If at some
Position measures very strong signal and the signal that slightly moves to another place just weakens much immediately, this explanation nearby nearby has electric discharge work
It is dynamic.And the equal difference of reading that each position measures in equipment is little, illustrate the position of point of discharge (activity may relatively strong) from
Farther out.
The analysis method of step S5 includes horizontal analysis:
The analysis assumes that apparent difference is not present in the apparatus insulated level of switchgear in the same switch gear room, can pass through
The average level of homogeneous measurement result is analyzed, and measures individual and deviates the degree of overall average level to judge that equipment whether there is
Insulation defect.For the above analysis, lateral comparison is carried out to the test result of switchgear in the same switch gear room, when a certain switch
The test result of cabinet individual than other switchgears test result and big background scene value when, then tentatively it is considered that this equipment
A possibility that existing defects, is larger.
The analysis method of step S5 includes trend analysis:
Analysis assumes that sudden deterioration will not occur for the dielectric level of equipment, and successional partial discharge test data is not in
Big difference, i.e. variable quantity keep stablizing, and fluctuate around zero point.The test result of same switchgear different time is divided
Analysis, so that comparative analysis obtains the operation conditions of switchgear.It needs periodically to detect switch cubicle switch cabinet, and will
The result archive backups detected every time, in order to analyze the variation of apparatus local discharge state in different time, so that judgement is set
Standby operation conditions.
The analysis method of step S5 includes statistical analysis:
Overall operation situation in each substation's different voltages level switch cabinet certain period of time can be counted
Analysis calculates its typical statistic parameters, and combines and assume certain probability Distribution Model, calculates put corresponding with probability of malfunction value
It is electric horizontal.
The analysis method of step S5 includes threshold value comparison:
With statistically analyze calculate obtain discharge level judge the likelihood of failure of equipment, and provide " normal ", " concern ",
A variety of aid decision suggestions such as " early warning " and " maintenance ".
Three threshold values Q1, Q2, Q3 are provided, which is obtained by above-mentioned statistical analysis.By the testing result Ve of certain switchgear
It is compared with these three threshold values, the operating status of the available switchgear at present, operating status includes: normally, pays close attention to, is pre-
Alert and maintenance.
10kV on-pole switch charges partial discharge inspection, and benefit is evident
1, solve the problems, such as that 10kV on-pole switch can not carry out live detection, it is determined that the shape in switch charging operation
State;
2, it saves the time, be restricted less
Traditional power failure detection is done to be limited by place:
If scene is without 220V power supply, then need to carry out dismounting replacement;If there is power supply at scene, then tester must upper boom work
Industry, work difficulty are big.
It does traditional power failure and detects on trial batch of conditionality:
Necessary pre- first to file has a power failure, and carries out examination & approval, could replace switch.Existing electricity consumption reliability requirement is high, and have a power failure examination & approval
Difficulty, the method exist uncertain.
3, the comparison of the test of 10kV on-pole switch electrification partial discharge and tradition power failure detection, electrification partial discharge test are with the obvious advantage.
Electrification partial discharge test tradition relatively have a power failure more be exchanged with experiment include it is time-consuming it is short, have a power failure without user, staff
Less, it is limited less without power supply bureau's internal communication coordination, equipment and special instrument, 1/4 that expense is traditional power failure testing cost, together
When power supply enterprise do not lose, user is without power failure.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, is familiar with
The those skilled in the art should be understood that the present invention includes but is not limited to attached drawing and interior described in specific embodiment above
Hold.Any modification without departing from function and structure principle of the invention is intended to be included in the range of claims.
Claims (4)
1.10kV on-pole switch charges partial discharge test piezoelectric type detector of sound, which is characterized in that including piezoelectric element, fixation
Seat, shell, the fixing seat and piezoelectric element are set in shell, and the piezoelectric element includes the two piezoelectric ceramics crystalline substances being stacked
Piece and the glued sheet metal being fixed between two piezoelectric ceramic wafers, the sheet metal extend to piezoelectric ceramic wafer with
Outside, the surface of the piezoelectric ceramic wafer is coated with layer of surface electrode, and the surface electrode is connect through conducting wire with output electrode,
The center portion combined axis of piezoelectric element is connected with coniform cone of pushing to, and the piezoelectric element is in the form of simple supported edge
It is fixed on fixed pedestal, the top of the metal shell is equipped with chain link fence.
2. piezoelectric type detector of sound according to claim 1, which is characterized in that the sheet metal and piezoelectric ceramic wafer
It is fixed using Low-temperature epoxy resinoid bond.
3. piezoelectric type detector of sound according to claim 1, which is characterized in that the surface electrode is plated using surface evaporation
The method of film is incorporated in piezoelectric ceramic wafer surface.
4. piezoelectric type detector of sound according to claim 1, which is characterized in that the center frequency of the piezoelectric type detector of sound
Rate is 40kHz.
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CN201811324114.6A CN109490724A (en) | 2018-11-08 | 2018-11-08 | 10kV on-pole switch charges partial discharge test piezoelectric type detector of sound |
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