CN107525958A - A kind of transient state device and method that induced voltage measures over the ground being used for power equipment - Google Patents
A kind of transient state device and method that induced voltage measures over the ground being used for power equipment Download PDFInfo
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- CN107525958A CN107525958A CN201710543625.6A CN201710543625A CN107525958A CN 107525958 A CN107525958 A CN 107525958A CN 201710543625 A CN201710543625 A CN 201710543625A CN 107525958 A CN107525958 A CN 107525958A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/1227—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 of components, parts or materials
Abstract
The present invention discloses a kind of transient state device that induced voltage measures over the ground being used for power equipment, including:Metal electrode, it is connected with the metal shell of electrical equipment by dielectric, in the metal outer wall of dielectric fitting and electric equipment, the metal electrode is used to form equivalent capacity by dielectric with the metal shell of electrical equipment;High-frequency element, it is connected with the metal electrode, for suppressing high frequency electromagnetic wave signal refraction reflection, the voltage signal for avoiding collecting is disturbed by extra-high frequency electromagnetic waves;Electromagnetic coupled circuit, connects with equivalent capacity, for transient state caused by shelf depreciation on power equipment, induced voltage signal to couple over the ground.The beneficial effects of the present invention are:The device of the present invention is freestanding, and the interference of the superfrequency electromagnetic signal in space is reduced using quarantine measures, solves the problems, such as that transient state is easily disturbed when induced voltage detects over the ground by non-measured frequency band signals, improves the signal to noise ratio of key signal.
Description
Technical field
It is used to set electric power the present invention relates to power equipment measurement of partial discharge field, and more particularly, to one kind
The standby transient state device and method that induced voltage measures over the ground.
Background technology
When shelf depreciation occurs for switch cubicle or GIS, discharge electricity amount is first gathered in the ground metal portion adjacent with point of discharge,
Form electromagnetic wave and propagated to all directions, electric wave detection essence in ground is electromagnetic wave caused by detection shelf depreciation.For extra-high
Frequency electromagnetic waves, significantly decay when propagating to metal outer wall, preferable amplitude can not be detected in metal surface, for high frequency
Rate electromagnetic wave (being usually 1MHz~30MHz), wave head can produce a transient state voltage-to-ground when traveling to metal surface, use electric capacity
Type probe can collect transient state induced voltage signal over the ground, and ground electric wave detection method is exactly so as to judging by studying the signal
The presence or absence of switch cubicle or GIS partial discharge.
Induced voltage detection is the detection method being currently widely used to transient state over the ground, to each caused by inside electric appliance
Class Partial Discharge Detection has certain effectiveness, and the Partial Discharge Sources of switch cubicle can be measured, and this method turns into electricity
One of common inspection means in the work of gas equipment state overhauling, its shortcoming are easily by radio signal and low-frequency electromagnetic wave etc.
Interference.
The content of the invention
It is used for the invention provides a kind of to the transient state device and method that induced voltage measures over the ground of power equipment,
With solve to transient state over the ground induced voltage detect when easily by all non-measured frequency ranges such as radio signal and low-frequency electromagnetic wave
The problem of signal interference.
In order to solve the above problems, according to an aspect of the invention, there is provided a kind of transient state being used for power equipment
The device that induced voltage measures over the ground, described device include:Metal electrode, dielectric, high-frequency element and electromagnetic coupled
Circuit,
The metal electrode, it is connected with the metal shell of electrical equipment by dielectric, dielectric fitting and electricity
In the metal outer wall of device equipment, the metal electrode is used to form equivalent electric by dielectric with the metal shell of electrical equipment
Hold;
The high-frequency element, it is connected with the metal electrode, for suppressing high frequency electromagnetic wave signal refraction reflection, avoids
The voltage signal collected is disturbed by extra-high frequency electromagnetic waves;
The electromagnetic coupled circuit, connects with equivalent capacity, for transient state pair caused by shelf depreciation on power equipment
Ground induced voltage signal is coupled.
Preferably, wherein described device also includes:
Measuring unit, it is electric over the ground according to the voltage divider principle acquisition transient state by equivalent capacity and electromagnetic coupled circuit capacitance
Press signal.
Preferably, wherein the high-frequency element includes:High frequency cable and SMA type high frequency seats, the cored wire of the high frequency cable
It is connected with metal electrode.
Preferably, wherein the metal electrode is the scale copper of polygon, the dielectric is soft silica gel piece.
Preferably, wherein the scale copper thickness is 20 microns;The thickness of the soft silica gel piece is 0.4mm.
Preferably, wherein the value of the equivalent capacity calculates in the following manner:
Wherein, C1For the value of equivalent capacity, ε is the dielectric constant of dielectric, εrIt is normal for the relative dielectric of metal electrode
Number, ε0For the dielectric constant of vacuum.
According to another aspect of the present invention, there is provided a kind of transient state induced voltage progress over the ground being used for power equipment
The method of measurement, methods described include:
The metal shell of metal electrode and electrical equipment forms equivalent capacity by dielectric;
Suppress high frequency electromagnetic wave signal refraction reflection using high-frequency element, the voltage signal for avoiding collecting is by superfrequency
The interference of electromagnetic wave;
Using electromagnetic coupled circuit, to transient state caused by shelf depreciation on power equipment, induced voltage signal carries out coupling over the ground
Close.
Preferably, wherein methods described also includes:
The transient state voltage-to-ground signal is obtained according to voltage divider principle by equivalent capacity and electromagnetic coupled circuit capacitance.
Preferably, wherein the high-frequency element includes:High frequency cable and SMA type high frequency seats.
Preferably, wherein the metal electrode is the scale copper of polygon, the dielectric is soft silica gel piece.
Preferably, wherein the scale copper thickness is 20 microns;The thickness of the soft silica gel piece is 0.4mm,
Preferably, wherein the value of the equivalent capacity calculates in the following manner:
Wherein, C1For the value of equivalent capacity, ε is the dielectric constant of dielectric, εrIt is normal for the relative dielectric of metal electrode
Number, ε0For the dielectric constant of vacuum.
The beneficial effects of the present invention are:
1. the device of the present invention is freestanding, it is not in power equipment to be measured in same structure, high pressure can be reduced
Danger Electric shock risk.
2. the device of the present invention uses the superfrequency electromagnetism in quarantine measures reduction space by filtering out power frequency interference signals
The interference of signal, solve transient state over the ground induced voltage detect when easily by radio signal and low-frequency electromagnetic wave etc., all are non-
The problem of measuring frequency band signals interference, improve the signal to noise ratio of key signal.
Brief description of the drawings
By reference to the following drawings, the illustrative embodiments of the present invention can be more fully understood by:
Fig. 1 is the transient state dress that induced voltage measures over the ground being used for power equipment according to embodiment of the present invention
Put 100 structural representation;
Fig. 2 is to be used for according to embodiment of the present invention to the transient state of power equipment showing of measuring of induced voltage over the ground
It is intended to;
Fig. 3 be according to embodiment of the present invention be used for the transient state of power equipment over the ground induced voltage measure etc.
Imitate circuit diagram;
Fig. 4 is the transient state dress that induced voltage measures over the ground being used for power equipment according to embodiment of the present invention
The schematic diagram put.And
Fig. 5 is the transient state side that induced voltage measures over the ground being used for power equipment according to embodiment of the present invention
The flow chart of method 500.
Embodiment
The illustrative embodiments of the present invention are introduced with reference now to accompanying drawing, however, the present invention can use many different shapes
Formula is implemented, and is not limited to embodiment described herein, there is provided these embodiments are to disclose at large and fully
The present invention, and fully pass on the scope of the present invention to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements are attached using identical
Icon is remembered.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has to person of ordinary skill in the field
It is common to understand implication.Further it will be understood that the term limited with usually used dictionary, be appreciated that and its
The linguistic context of association area has consistent implication, and is not construed as Utopian or overly formal meaning.
Fig. 1 is the transient state dress that induced voltage measures over the ground being used for power equipment according to embodiment of the present invention
Put 100 structural representation.As shown in figure 1, the transient state dress that induced voltage measures over the ground being used for power equipment
Put 100 and be used for that induced voltage to measure over the ground to the transient state of power equipment, described device 100 possesses absolute construction, anti-interference
The characteristics of ability is by force and measurement is convenient.Described device 100 includes:Metal electrode 101, dielectric 102, the and of high-frequency element 103
Electromagnetic coupled circuit 104.Preferably, the metal electrode 101 is connected with the metal shell of electrical equipment by dielectric 102
Connect, in the metal outer wall of dielectric fitting and electric equipment, the metal electrode is used to lead to the metal shell of electrical equipment
Cross dielectric and form equivalent capacity.Preferably, wherein the metal electrode is the scale copper of polygon, the dielectric is
Soft silica gel piece.Preferably, wherein the scale copper thickness is 20 microns;The thickness of the soft silica gel piece is 0.4mm.Preferably,
The value of wherein described equivalent capacity calculates in the following manner:
Wherein, C1For the value of equivalent capacity, ε is the dielectric constant of dielectric, εrIt is normal for the relative dielectric of metal electrode
Number, ε 0 are the dielectric constant of vacuum.To realize convenient equivalent capacity C1, the scale copper thickness is about 20 microns;Thin copper
Piece front end is supported using soft silica gel piece as electric capacity, and thickness is no more than 0.5 millimeter, and its thickness directly determines scale copper with being tested
The distance of switch cubicle metal outer wall, its thickness should be reduced as far as possible on the premise of good insulation is ensured.Electrical equipment metal outer wall
The value of the equivalent capacity formed between metal electrode is relevant with the size of metal electrode and material, it is preferred that using polygon
Or it is similar to the good fine copper or beallon of electrical conductivity of polygon.
Preferably, the high-frequency element 103 is connected with the metal electrode, for suppressing high frequency electromagnetic wave signal refraction
Reflection, the voltage signal for avoiding collecting are disturbed by extra-high frequency electromagnetic waves.Preferably, wherein the high-frequency element includes:
High frequency cable and SMA type high frequency seats, the cored wire of the high frequency cable are connected with metal electrode.
Preferably, the electromagnetic coupled circuit 104, connects with equivalent capacity, for being produced to shelf depreciation on power equipment
Induced voltage signal is coupled raw transient state over the ground.
Preferably, wherein described device also includes:
Measuring unit, it is electric over the ground according to the voltage divider principle acquisition transient state by equivalent capacity and electromagnetic coupled circuit capacitance
Press signal.
Fig. 2 is to be used for according to embodiment of the present invention to the transient state of power equipment showing of measuring of induced voltage over the ground
It is intended to.As shown in Fig. 2 whole device fitting is with the shell wall of power equipment to be measured, forming equivalent circuit C1 and electromagnetic coupled
Circuit capacitance C2, the transient signal that electromagnetic wave senses on equipment outer wall is according to voltage divider principle from electric capacity C1 and the coupling of series connection with it
Electric capacity C2 both ends are closed to obtain.
Fig. 3 be according to embodiment of the present invention be used for the transient state of power equipment over the ground induced voltage measure etc.
Imitate circuit diagram.As shown in figure 3, measurement module by equivalent capacity C1 and electromagnetic coupled circuit capacitance C2 according to voltage divider principle, from
Equivalent capacity C1 both ends obtain the transient state voltage-to-ground letter office.
Fig. 4 is the transient state dress that induced voltage measures over the ground being used for power equipment according to embodiment of the present invention
The schematic diagram put.As illustrated, described device includes:Soft silica gel piece 1, scale copper metal electrode 2, high frequency cable 3, insulation crust
4, electromagnetic coupled circuit 5, SMA type high frequencies seat 6.The insulation crust and remaining part pass through the closing structure with shield effectiveness
Composition measuring apparatus;The electromagnetic coupled circuit has signal coupling to the transient voltage of electromagnetic wave induction on GIS or switch cabinet
Conjunction ability, the design of the electromagnetic coupled circuit should reduce the resonance of electric capacity and inductance in high frequency;The soft silica gel piece fitting
In in the metal outer wall of tested electrical equipment, and equivalent capacity is formed with metal outer wall;The SMA types high frequency seat, high frequency cable
The signal after collection is avoided by electromagnetic interference;The transient state that whole parts described above are formed induced voltage sensing element over the ground
With larger frequency band range.
According to the general principle of transient state induced electricity platen press over the ground, a metal electrode is laid simultaneously in electrical equipment metal outer wall
And using soft silica gel piece as dielectric, equivalent electric is formed by soft kiss-coating piece between metal electrode and electrical equipment outer wall shell
Hold, then Partial discharge signal can be from the both ends of equivalent capacity according to principle of capacitive divider by electric capacity and the coupled capacitor with connecting
Obtain Partial discharge signal.Equivalent capacity C1 computational methods are:
Wherein, ε is the dielectric constant of medium, and ε r are the relative dielectric constant of metal electrode, and ε 0 is the dielectric constant of vacuum.
To realize convenient equivalent capacity C1, the scale copper thickness is about 20 microns;Scale copper front end uses soft silica gel piece conduct
Electric capacity supports, and thickness is no more than 0.5 millimeter, and its thickness directly determines the distance of scale copper and tested switch cubicle metal outer wall,
Its thickness should be reduced on the premise of good insulation is ensured as far as possible.
The value of the equivalent capacity formed between electrical equipment metal outer wall and scale copper metal electrode and the material of metal electrode
Matter is relevant with size, it is preferred that using polygon or is similar to the good fine copper or beallon of electrical conductivity of polygon.
Insulation crust has exterior insulation ability, avoids the interference signals such as static electricity on human body during operation from producing measurement result
Influence, it is preferred that the less good conductors of resistance such as copper, aluminium can be used in insulation crust internal shield external electromagnetic waves.SMA
The component feature impedances such as type high frequency seat, high frequency cable are 50 Ω, and its cored wire is connected with scale copper, and it is anti-to suppress high-frequency signal refraction
Penetrate, avoid the signal after collection to be disturbed by ultrahigh frequency electromagnetic wave signal as far as possible, when interference electromagnetic wave (generally superfrequency
Electromagnetic wave) it can be absorbed or reflected when passing to the metal surface of high-frequency element, so as to electromagnetic wave energy of decaying.By using every
From the interference that radio signal and low frequency electromagnetic signals are reduced with shielding measure, the signal to noise ratio of key signal is effectively increased.
Electromagnetic coupled circuit is to the transient state of electromagnetic wave induction, there is induced voltage signal to obtain over the ground on GIS or switch cabinet
Take ability.When shelf depreciation occurs for the electrical equipment such as GIS or switch cubicle, transient signal that electromagnetic wave senses on equipment outer wall
It can be obtained according to voltage divider principle from the coupled capacitor C2 both ends of electric capacity C1 and series connection with it.Electromagnetic coupled circuit reduces in high frequency
The resonance of electric capacity and lead inductance, induced voltage sensing element has larger frequency band to the transient state that all of the above part is formed over the ground
Scope.
Fig. 5 is the transient state side that induced voltage measures over the ground being used for power equipment according to embodiment of the present invention
The flow chart of method 500.As shown in figure 5, the transient state method 500 that induced voltage measures over the ground being used for power equipment
For for the transient state to power equipment, induced voltage to measure over the ground, methods described 500 is since step 501 place, in step
The metal shell of rapid 501 metal electrode and electrical equipment forms equivalent capacity by dielectric.Preferably, wherein the metal
Electrode is the scale copper of polygon, and the dielectric is soft silica gel piece.Preferably, wherein the value of the equivalent capacity by with
Under type calculates:
Wherein, C1For the value of equivalent capacity, ε is the dielectric constant of dielectric, εrIt is normal for the relative dielectric of metal electrode
Number, ε0For the dielectric constant of vacuum.
Preferably, wherein the scale copper thickness is 20 microns;The thickness of the soft silica gel piece is preferably 0.4mm,
Preferably, suppress high frequency electromagnetic wave signal refraction reflection using high-frequency element in step 502, avoid the electricity collected
Pressure signal is disturbed by extra-high frequency electromagnetic waves.Preferably, wherein the high-frequency element includes:High frequency cable and SMA type high frequencies
Seat.
Preferably, transient state caused by shelf depreciation on power equipment is felt over the ground using electromagnetic coupled circuit in step 503
Voltage signal is answered to be coupled.
Preferably, wherein methods described also includes:
The transient state voltage-to-ground signal is obtained according to voltage divider principle by equivalent capacity and electromagnetic coupled circuit capacitance.
Embodiments of the invention are used for the transient state device 100 that induced voltage measures over the ground of power equipment and this
Being used for for another embodiment of invention is corresponding to the transient state method 500 that induced voltage measures over the ground of power equipment,
It will not be repeated here.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
What subsidiary Patent right requirement was limited, except the present invention other embodiments disclosed above equally fall the present invention's
In the range of.
Normally, all terms used in the claims are all solved according to them in the usual implication of technical field
Release, unless clearly being defined in addition wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurately order, unless explicitly stated otherwise.
Claims (12)
- A kind of 1. transient state device that induced voltage measures over the ground being used for power equipment, it is characterised in that described device Including:Metal electrode, dielectric, high-frequency element and electromagnetic coupled circuit,The metal electrode, it is connected with the metal shell of electrical equipment by dielectric, dielectric fitting is set with electrical equipment In standby metal outer wall, the metal electrode is used to form equivalent capacity by dielectric with the metal shell of electrical equipment;The high-frequency element, it is connected with the metal electrode, for suppressing high frequency electromagnetic wave signal refraction reflection, avoids gathering To voltage signal disturbed by extra-high frequency electromagnetic waves;The electromagnetic coupled circuit, connects with equivalent capacity, for feeling over the ground to transient state caused by shelf depreciation on power equipment Voltage signal is answered to be coupled.
- 2. device according to claim 1, it is characterised in that described device also includes:Measuring unit, the transient state voltage-to-ground is obtained according to voltage divider principle by equivalent capacity and electromagnetic coupled circuit capacitance and believed Number.
- 3. device according to claim 1, it is characterised in that the high-frequency element includes:High frequency cable and SMA type high frequencies Seat, the cored wire of the high frequency cable are connected with metal electrode.
- 4. device according to claim 1, it is characterised in that the metal electrode is the scale copper of polygon, described exhausted Edge medium is soft silica gel piece.
- 5. device according to claim 4, it is characterised in that the scale copper thickness is 20 microns;The soft silica gel piece Thickness be 0.4mm.
- 6. device according to claim 1, it is characterised in that the value of the equivalent capacity calculates in the following manner:<mrow> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo>=</mo> <mfrac> <mrow> <mi>&epsiv;</mi> <mi>s</mi> </mrow> <mi>d</mi> </mfrac> <mo>=</mo> <mfrac> <mrow> <msub> <mi>&epsiv;</mi> <mi>r</mi> </msub> <msub> <mi>&epsiv;</mi> <mn>0</mn> </msub> <mi>s</mi> </mrow> <mi>d</mi> </mfrac> <mo>,</mo> </mrow>Wherein, C1For the value of equivalent capacity, ε is the dielectric constant of dielectric, εrFor the relative dielectric constant of metal electrode, ε0 For the dielectric constant of vacuum.
- A kind of 7. transient state method that induced voltage measures over the ground being used for power equipment, it is characterised in that methods described Including:The metal shell of metal electrode and electrical equipment forms equivalent capacity by dielectric;Suppress high frequency electromagnetic wave signal refraction reflection using high-frequency element, the voltage signal for avoiding collecting is by superfrequency electromagnetism The interference of ripple;Using electromagnetic coupled circuit, to transient state caused by shelf depreciation on power equipment, induced voltage signal couples over the ground.
- 8. according to the method for claim 7, it is characterised in that methods described also includes:The transient state voltage-to-ground signal is obtained according to voltage divider principle by equivalent capacity and electromagnetic coupled circuit capacitance.
- 9. according to the method for claim 7, it is characterised in that the high-frequency element includes:High frequency cable and SMA type high frequencies Seat.
- 10. according to the method for claim 7, it is characterised in that the metal electrode is the scale copper of polygon, described exhausted Edge medium is soft silica gel piece.
- 11. according to the method for claim 10, it is characterised in that the scale copper thickness is 20 microns;The soft silica gel The thickness of piece is 0.4mm.
- 12. according to the method for claim 7, it is characterised in that the value of the equivalent capacity calculates in the following manner:<mrow> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo>=</mo> <mfrac> <mrow> <mi>&epsiv;</mi> <mi>s</mi> </mrow> <mi>d</mi> </mfrac> <mo>=</mo> <mfrac> <mrow> <msub> <mi>&epsiv;</mi> <mi>r</mi> </msub> <msub> <mi>&epsiv;</mi> <mn>0</mn> </msub> <mi>s</mi> </mrow> <mi>d</mi> </mfrac> <mo>,</mo> </mrow>Wherein, C1For the value of equivalent capacity, ε is the dielectric constant of dielectric, εrFor the relative dielectric constant of metal electrode, ε0 For the dielectric constant of vacuum.
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Cited By (1)
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CN110865284A (en) * | 2019-11-12 | 2020-03-06 | 云南电网有限责任公司临沧供电局 | Magnetic attraction type capacitance probe based on polyvinylidene fluoride film |
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CN102508128A (en) * | 2011-10-24 | 2012-06-20 | 天津大学 | Switch cabinet local discharge transient-to-ground voltage detection system based on wireless network |
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