CN112748293B - Measuring system for internal space charge distribution of high-voltage direct-current sleeve in operating state - Google Patents
Measuring system for internal space charge distribution of high-voltage direct-current sleeve in operating state Download PDFInfo
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- CN112748293B CN112748293B CN202011529843.2A CN202011529843A CN112748293B CN 112748293 B CN112748293 B CN 112748293B CN 202011529843 A CN202011529843 A CN 202011529843A CN 112748293 B CN112748293 B CN 112748293B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/24—Arrangements for measuring quantities of charge
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
A space charge distribution measuring system in a high-voltage direct-current bushing in an operating state comprises a space charge measuring device and a computer data processing system; the space charge detection device is fixed on the interface of the high-voltage direct-current dry-type sleeve SF6 and the epoxy impregnated paper; the space charge measuring device integrates a high-voltage pulse power supply, a mechanical guide rail controller, a signal receiver, a signal amplifier and a Bluetooth module; the computer data processing system acquires a space charge signal from the space charge measuring device through a Bluetooth connection. The invention can safely, accurately and conveniently obtain the internal space charge density distribution condition of the high-voltage direct-current sleeve.
Description
Technical Field
The invention belongs to the field of power system testing, and particularly relates to a system for measuring the space charge distribution in a high-voltage direct-current bushing in an operating state.
Background
The high-voltage direct-current transmission has the advantages of large transmission power, long distance, narrow overhead corridor, low manufacturing cost, good control performance and the like, is an important means for long-distance and trans-regional transmission, and is widely applied in the world. By 2020, high-voltage transmission lines can be built up by 9.4 kilometers and the conversion capacity is as high as 4.6 hundred million kilowatts. The high-voltage direct-current dry-type sleeve mainly comprises equipment such as a converter transformer valve side sleeve, a wall bushing and the like, bears electrical connection of system full voltage and full current, and is a throat of an alternating-current and direct-current hybrid power grid. However, the defects/faults of the high-voltage direct-current dry-type sleeve frequently account for 16.7% of the faults of the direct-current primary equipment, and the high-voltage direct-current dry-type sleeve is the primary equipment causing the highest locking frequency of the converter valve.
Researches show that the space charge is an important factor causing the polymer electric aging, and the electric aging degree, the structure damage, the trap density and the distribution of the trap density of the polymer can be visually reflected. Therefore, through the measurement of space charge, the aging and breakdown mechanisms of the insulating material can be analyzed from a microscopic perspective, and the insulating state can be evaluated.
The most common method at present is electro-acoustic pulsing, the PEA of which has been used for the spatial distribution testing of actual casing samples in the laboratory. However, the existing space charge testing device can only measure the space charge density distribution at a fixed position, and cannot measure the space charge density distribution of multiple areas in the sleeve, so that the distribution rule of the space charge in the sleeve cannot be determined, and the internal charge accumulation point can be determined.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a measuring system for internal space charge distribution of a high-voltage direct-current bushing in an operating state, which is reasonable in design, compact in structure and convenient to carry and install.
The invention adopts the following technical scheme:
a system for measuring the space charge distribution in a high-voltage direct-current bushing in an operating state comprises a space charge measuring device 1 and a computer data processing system 9,
the space charge measuring device 1 is fixed on an interface of SF6 and epoxy impregnated paper in the high-voltage direct-current dry-type sleeve;
the computer data processing system 9 is connected to the space charge measuring device 1 via a bluetooth module to acquire a space charge signal.
The space charge measuring device 1 comprises a high-voltage pulse power supply, a mechanical guide rail controller, a signal receiver, a signal amplifier and a Bluetooth module;
the space charge measuring device 1 receives and amplifies the space charge signal transmitted by the space charge sensor 4 through a signal receiver, a signal amplifier and a bluetooth module, and then transmits the signal to a computer data processing system 9 in a radio mode.
A slide rail 7 is arranged on the outer side of the interface of the lower part of the space charge measuring device 1 and the epoxy impregnated paper, a telescopic mechanical arm 2 is arranged on the slide rail 7, and the mechanical arm 2 is connected with the central position of the upper part of the ring electrode.
The robot arm 2 is connected to the ring electrode 5 by a non-conductive material.
And a lead is additionally arranged on the mechanical arm 2 and is connected with the annular electrode 5 for leading in pulse to form a loop.
And a data line is additionally arranged on the mechanical arm 2 and is connected with the space charge measuring device 1 and the space charge sensor 4.
The space charge sensor 4 and the absorption layer 3 are additionally arranged on the outer side of the annular electrode 5, the absorption layer 3 is tightly attached to the outer side of the space charge sensor 4,
the absorption layer 3 is made of organic glass.
The computer data processing system 9 has a PEA space charge receiving means with bluetooth communication function,
wherein PEA is electroacoustic pulse method.
The high-voltage pulse power supply integrated with the space charge measuring device 1 transmits high-voltage pulses through the conducting rod 8, the high-voltage pulses flow into the annular electrode 5 through epoxy impregnated paper, the electrical resistivity of each part in the epoxy impregnated paper is the same, and the high-voltage pulses form a passage along the shortest path;
when space charge accumulation occurs in the first area of the epoxy impregnated paper, the second area of the surface of the ring electrode (5) is subjected to the resultant force f of pulse acting force and space charge acting force 1 ：
Wherein: sigma 1 Is the surface charge density of the ring electrode; e.g. of the type p (t) is the pulse amplitude at time t; epsilon r Is the relative dielectric constant of the epoxy impregnated paper; epsilon 0 Is a vacuum dielectric constant; ρ (x) is the first region x location space charge density; v A A space charge accumulation volume;
when the second area is acted by space charge, the space charge sensor 4 additionally arranged outside the annular electrode 5 senses the stress position, the stress position is expressed in a coordinate mode, the space charge is determined to be in a pulse path, all stress areas which can be sensed by the space charge sensor 4 are obtained at the same time, the stress areas are expressed in a coordinate lattice mode, and the sectional area of the space charge accumulation area is obtained.
For a pulse propagating in the epoxy impregnated paper with a velocity v, the sound pressure of the sound wave of the pulse passing through the space charge region and incident on the space charge sensor 4 part is:
x＝vτ
wherein: k is the sound wave propagation coefficient; s is the sectional area of a space charge accumulation region; sigma 2 Is the surface charge density of the conducting rod; tau. a Is the travel time of the sound wave through the epoxy impregnated paper; tau is b The time for the sound wave to pass through the annular electrode; τ is the time for the narrow pulse to propagate in the epoxy impregnated paper; t is the pulse time; p (x) is the first region x position space charge density; r is the section radius of the epoxy impregnated paper;
the potential difference generated across the space charge sensor 4 by the piezoelectric effect is:
V p ＝gaΔP(t)
wherein: g is a piezoelectric stress constant; a is the thickness of the space charge sensor;
V p the signal is amplified by a signal amplifier integrated with the space charge measuring device 1, and the amplified signal is transmitted to a computer data processing system 9 through Bluetooth to obtain a space charge measurement output signal Vx:
wherein: Δ T is the pulse half-peak width, ρ (T- τ) b ) At a time t-tau b The space charge density of all the regions is,
output signal V O The position and density of the space charge distribution in the epoxy-impregnated paper were measured from the output signal obtained by the computer data processing system 9 in a proportional relationship with the space charge distribution and the surface charge density distribution of the electrode.
The beneficial effects of the invention are that compared with the prior art:
according to the measuring system for the space charge distribution in the high-voltage direct-current sleeve in the running state, the space charge measuring device is additionally arranged in the high-voltage direct-current dry-type sleeve, and the position of the mechanical arm is adjusted through the sliding rail, so that the density distribution of the space charge at different positions in the high-voltage direct-current dry-type sleeve in the running state is measured. Adopt the bluetooth transmission mode simultaneously, signal transmission to outside computer data processing system with measuring device collection also compromises the simplicity of carrying and installing when guaranteeing space charge signal test's sensitivity, can carry out the space charge test to the inside sleeve pipe effectively, has solved the defect that traditional space charge measuring device can't measure the inside multizone space charge density distribution of sleeve pipe.
Drawings
FIG. 1 is a front view of a model of a space charge distribution measuring system in an interior of a high voltage DC bushing under an operating state according to the present invention;
FIG. 2 is a bottom view of the model of the space charge distribution measuring system in the HVDC bushing under the operating condition of the present invention;
FIG. 3 is a schematic model diagram of a null point charge measurement principle;
wherein: the device comprises a space charge measuring device 1, a mechanical arm 2, an absorption layer 3, a space charge sensor 4, an annular electrode 5, a space charge measuring region 6, a slide rail 7, a conducting rod 8 and a computer data processing system 9.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described clearly and completely in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art without inventive step, are within the scope of protection of the present invention.
As shown in fig. 1, a system for measuring the space charge distribution inside a high voltage direct current bushing in an operating state comprises a space charge measuring device 1 and a computer data processing system 9;
the space charge measuring device 1 is fixed on an interface of SF6 and epoxy impregnated paper in the high-voltage direct-current dry-type sleeve;
the space charge measuring device 1 integrates a high-voltage pulse power supply, a mechanical guide rail controller, a signal receiver, a signal amplifier and a bluetooth module.
The computer data processing system 9 acquires the space charge signal by connecting the space charge measuring device 1 via bluetooth.
The space charge measuring device 1 receives and amplifies the space charge signal transmitted by the space charge sensor 4 through the signal receiver, the signal amplifier and the bluetooth module, and then transmits the signal to the computer data processing system 9 through radio.
The computer data processing system 9 has a PEA space charge receiving means with bluetooth communication function,
wherein PEA is electroacoustic pulse method.
A slide rail 7 is arranged on the outer side of the interface of the lower part of the space charge measuring device 1 and the epoxy impregnated paper, a telescopic mechanical arm 2 is arranged on the slide rail 7, and the mechanical arm 2 is connected with the central position of the upper part of the ring electrode.
The robot arm 2 and the ring electrode 5 are connected by a non-conductive material.
And a lead is additionally arranged on the mechanical arm 2 and is connected with the annular electrode 5 for leading in pulse to form a loop.
The space charge sensor 4 and the absorption layer 3 are additionally arranged on the outer side of the annular electrode 5, and the absorption layer 3 is tightly attached to the outer side of the space charge sensor 4.
The absorption layer 3 is made of organic glass.
And a data line is additionally arranged on the mechanical arm 2 and is connected with the space charge measuring device 1 and the space charge sensor 4.
The high voltage pulse power supply integrated with the space charge measuring device 1 will emit a high voltage pulse through the conducting rod 8, through the epoxy impregnated paper, and into the ring electrode 5. Since the resistivity is the same everywhere in the epoxy impregnated paper, the high voltage pulse will form a path along the shortest path.
When space charge accumulation occurs in the first area of the epoxy impregnated paper, the second area of the surface of the ring electrode 5 will be subjected to the resultant force f of the pulse force and the space charge force as shown in fig. 2 and 3 1 ：
Wherein: sigma 1 Is the surface charge density of the ring electrode; e.g. of a cylinder p (t) is the pulse amplitude at time t; epsilon r Is the relative dielectric constant of epoxy impregnated paper; epsilon 0 Is a vacuum dielectric constant; ρ (x) is the first region x location space charge density; v A A space charge accumulation volume;
when the second area is subjected to space charge acting force, the space charge sensor 4 additionally arranged on the outer side of the annular electrode 5 senses the stressed position, and the space charge is determined to be positioned on the pulse path L. And simultaneously acquiring all stressed areas sensed by the space charge sensor 4 to obtain the sectional area S of the space charge accumulation area.
For a pulse propagating in the epoxy impregnated paper with a velocity v, the sound pressure of the sound wave of the pulse passing through the space charge region and incident on the space charge sensor 4 part is:
x＝vτ
wherein: k is the acoustic wave propagation coefficient; s is the sectional area of the space charge accumulation region; sigma 2 Is the surface charge density of the conducting rod; tau is a Is the travel time of the sound wave through the epoxy impregnated paper; tau is b The time for the sound wave to pass through the annular electrode; τ is the time for the narrow pulse to propagate in the epoxy impregnated paper; t is the pulse time; ρ (x) is the first region x location space charge density; r is the section radius of the epoxy impregnated paper;
the potential difference generated across the space charge sensor 4 by the piezoelectric effect is:
V p ＝gaΔP(t)
wherein: g is a piezoelectric stress constant; a is the thickness of the space charge sensor;
V p the signal is amplified by a signal amplifier integrated with the space charge measuring device 1, and the amplified signal is transmitted to a computer data processing system 9 by Bluetooth to obtain a space charge measuring output signal V O ：
Wherein: Δ T is the pulse half-peak width, ρ (T- τ) b ) At a time t-tau b The space charge density of all the regions is,
the output signal V can be seen O The distribution of space charge and the surface charge density distribution of the electrode are in direct proportion, so that the distribution position and the density of the space charge in the epoxy impregnated paper can be measured through an output signal obtained by a computer data processing system.
In conclusion, the measuring system for the space charge distribution in the high-voltage direct-current sleeve in the running state can safely, accurately, conveniently and systematically measure the space charge density distribution conditions at different positions in the high-voltage direct-current dry-type sleeve, and provides effective data support for the insulation safety of a power system.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (9)
1. A system for measuring the space charge distribution in a high-voltage direct-current bushing in an operating state comprises a space charge measuring device (1) and a computer data processing system (9), and is characterized in that:
the space charge measuring device (1) is fixed on an interface of SF6 and epoxy impregnated paper in the high-voltage direct-current dry-type sleeve;
the computer data processing system (9) is connected with the space charge measuring device (1) through a Bluetooth module to acquire a space charge signal;
a high-voltage pulse power supply integrated with the space charge measuring device (1) transmits high-voltage pulses through a conducting rod (8), the high-voltage pulses flow into the annular electrode (5) through epoxy impregnated paper, the electrical resistivity of each part in the epoxy impregnated paper is the same, and the high-voltage pulses form a passage along the shortest path;
when space charge accumulation occurs in the first area of the epoxy impregnated paper, the second area of the surface of the ring electrode (5) is subjected to the resultant force f of pulse acting force and space charge acting force 1 ：
Wherein: sigma 1 Is the surface charge density of the ring electrode; e.g. of a cylinder p (t) is the pulse amplitude at time t; epsilon r Is the relative dielectric constant of epoxy impregnated paper; epsilon 0 Is a vacuum dielectric constant; ρ (x) is the first region x location space charge density; v A A space charge accumulation volume;
when the second area is acted by space charge, the space charge sensor (4) additionally arranged on the outer side of the annular electrode (5) senses the stress position, the stress position is expressed in a coordinate mode, the space charge is determined to be on a pulse path, all stress areas which can be sensed by the space charge sensor (4) are obtained at the same time, the stress areas are expressed by a coordinate lattice, and the sectional area of the space charge accumulation area is obtained.
2. The system according to claim 1, wherein the measurement system for the space charge distribution inside the HVDC bushing under one operating condition comprises:
the space charge measuring device (1) comprises a high-voltage pulse power supply, a mechanical guide rail controller, a signal receiver, a signal amplifier and a Bluetooth module;
the space charge measuring device (1) receives and amplifies a space charge signal transmitted by a space charge sensor (4) through a signal receiver, a signal amplifier and a Bluetooth module, and then transmits the signal to a computer data processing system (9) in a radio mode.
3. The system according to claim 2, wherein the measurement system for the space charge distribution inside the HVDC bushing under one operating condition comprises:
a slide rail (7) is arranged on the outer side of the interface of the lower portion of the space charge measuring device (1) and epoxy impregnated paper, a telescopic mechanical arm (2) is arranged on the slide rail (7), and the mechanical arm (2) is connected with the center of the upper portion of the ring electrode.
4. A system according to claim 3 for measuring the internal space charge distribution of a hvdc bushing in an operating state, characterized in that:
the mechanical arm (2) is connected with the annular electrode (5) through a non-conductive material.
5. The system according to claim 4, wherein the system is configured to measure the space charge distribution inside the HVDC bushing during an operating state, and wherein:
and a lead is additionally arranged on the mechanical arm (2) and is connected with the annular electrode (5) for leading in pulse to form a loop.
6. The system according to claim 5, wherein the system is configured to measure the space charge distribution inside the HVDC bushing during an operating state, and wherein:
the data line is additionally arranged on the mechanical arm (2) and connected with the space charge measuring device (1) and the space charge sensor (4).
7. The system according to claim 5, wherein the system is configured to measure the space charge distribution inside the HVDC bushing during an operating state, and wherein:
the space charge sensor (4) and the absorption layer (3) are additionally arranged on the outer side of the annular electrode (5), the absorption layer (3) is tightly attached to the outer side of the space charge sensor (4),
the absorption layer (3) is made of organic glass.
8. The system according to claim 1, wherein the measurement system for the space charge distribution inside the HVDC bushing under one operating condition comprises:
the computer data processing system (9) has a PEA space charge receiving device with Bluetooth communication function,
wherein PEA is electroacoustic pulse method.
9. The system according to claim 1, wherein the measurement system for the space charge distribution inside the HVDC bushing under one operating condition comprises:
for the pulse propagating in the epoxy impregnated paper, the speed is v, and the sound pressure of the sound wave of the pulse passing through the space charge area and being incident on the space charge sensor (4) part is:
x＝vτ
wherein: k is the sound wave propagation coefficient; s is the sectional area of a space charge accumulation region; sigma 2 Is the surface charge density of the conducting rod; tau is a Is the travel time of the sound wave through the epoxy impregnated paper; tau is b The time for the sound wave to pass through the annular electrode; τ is the time for the narrow pulse to propagate in the epoxy impregnated paper; t is the pulse time; ρ (x) is the first region x location space charge density; r is the section radius of the epoxy impregnated paper;
the potential difference generated by the piezoelectric effect on both sides of the space charge sensor (4) is:
V p ＝gaΔP(t)
wherein: g is a piezoelectric stress constant; a is the thickness of the space charge sensor;
V p the signal is amplified by a signal amplifier integrated with the space charge measuring device (1), and the amplified signal is transmitted to a computer data processing system (9) by Bluetooth to obtain a space charge measuring output signal V O ：
Wherein: Δ T is the pulse half-peak width, ρ (T- τ) b ) At a time t-tau b The space-charge density of all the regions is,
output signal V O The position and density of the space charge distribution in the epoxy impregnated paper are measured by an output signal obtained by a computer data processing system (9) in a direct proportion relation with the space charge distribution and the surface charge density distribution of the electrode.
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