CN210005622U - Transformer overvoltage and partial discharge comprehensive monitoring system based on sleeve tap - Google Patents
Transformer overvoltage and partial discharge comprehensive monitoring system based on sleeve tap Download PDFInfo
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- CN210005622U CN210005622U CN201822147259.5U CN201822147259U CN210005622U CN 210005622 U CN210005622 U CN 210005622U CN 201822147259 U CN201822147259 U CN 201822147259U CN 210005622 U CN210005622 U CN 210005622U
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Abstract
The utility model relates to an kind based on transformer overvoltage and partial discharge integrated monitoring system of sleeve pipe end screen, this system include transformer sleeve pipe by monitoring object, overvoltage and partial discharge integrated sensor module, coaxial cable transmission module, decay and low pass filter module, band pass filter and amplification device module, data acquisition device module, data analysis, demonstration, storage and transmission module and data monitoring and diagnostic module compare with prior art, the utility model has the advantages of simple, practical, reliable, reduce electromagnetic interference, can the many monitoring capacities of full play sleeve pipe end screen.
Description
Technical Field
The utility model belongs to the technical field of transformer class on-line monitoring and specifically relates to relate to kinds of transformer overvoltage and partial discharge integrated monitoring system based on sleeve pipe end screen.
Background
With the construction of the national smart grid pilot project, the smart grid technology, particularly the smart substation technology, is rapidly developed, wherein the on-line monitoring technology of the substation equipment plays an important role in promoting the construction of the smart substation. The technology comprises the technologies of transformer partial discharge online monitoring, transformer substation insulator leakage current online monitoring, capacitive transformation equipment online monitoring, MOA online monitoring, GIS partial discharge online monitoring, high-voltage switch cabinet state monitoring and the like, and is well applied to power systems. The on-line monitoring of the transformer comprises the characteristic quantities of dissolved gas in oil, partial discharge, winding deformation, iron core grounding current, micro water in oil, dielectric loss factor and capacitance of a high-voltage bushing and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing kinds of transformer overvoltage and partial discharge comprehensive monitoring system based on sleeve pipe end screen in order to overcome the defects of the prior art.
The purpose of the utility model can be realized through the following technical scheme:
comprehensive monitoring system for overvoltage and partial discharge of transformer based on bushing end screen, which comprises monitored object of transformer bushing, comprehensive sensor module for overvoltage and partial discharge, coaxial cable transmission module, attenuation and low pass filter module, band pass filter and amplifier module, data acquisition device module, data analysis, display, storage and transmission module, and data monitoring and diagnosis module;
the monitored object of the transformer bushing is sequentially connected with a coaxial cable transmission module, an attenuation and low-pass filtering module, a data acquisition device module, a data analysis, display, storage and transmission module and a data monitoring and diagnosis module through an overvoltage and partial discharge comprehensive sensor module to form a transformer overvoltage waveform detection loop based on a bushing end screen;
the monitored object of the transformer bushing is sequentially connected with a coaxial cable transmission module, a band-pass filtering and amplifying device module, a data acquisition device module, a data analysis, display, storage and transmission module and a data monitoring and diagnosis module through an overvoltage and partial discharge comprehensive sensor module to form a transformer partial discharge pulse current signal detection loop based on a bushing end screen.
Preferably, the monitored object of the transformer bushing comprises the transformer bushing, a high-voltage guide rod, a capacitor plate and a special interface for a bushing end screen; the overvoltage and partial discharge comprehensive sensor module is connected with a special interface for a sleeve tap through a sleeve tap butt joint.
Preferably, the overvoltage and partial discharge integrated sensor module comprises a capacitance sensor, a broadband micro current sensor, a metal guide rod and a metal shielding shell, wherein the capacitance sensor and the broadband micro current sensor are packaged in the metal shielding shell, the metal guide rod is inserted into the metal shielding shell, and the metal shielding shell is reliably grounded.
Preferably, the capacitance sensor is connected with the special interface for the sleeve end screen through the metal guide rod and the sleeve end screen butt joint in sequence.
Preferably, the capacitance sensor is a capacitance sensor made by connecting 8 axisymmetric non-inductive capacitors in parallel.
Preferably, the iron core of the broadband micro current sensor is made of manganese-zinc ferrite.
Preferably, the broadband micro current sensor is a hollow through sensor.
Compared with the prior art, the utility model has the advantages of it is following:
1. the special interface is designed for the transformer bushing end screen, the end screen is reliably grounded after being connected with the non-inductive capacitor in series through the metal guide rod, so that overvoltage signal measurement of bushing capacitance and voltage division of the non-inductive capacitor is formed, meanwhile, a broadband micro-current sensor (high-frequency CT) is utilized to measure local discharge pulse current signals on the metal guide rod, and the integrated sensor which is packaged through a metal shield and is designed into body and is provided with the bushing end screen integrated sensor for measuring overvoltage waveforms and the local discharge pulse current signals simultaneously;
2. the utility model has the advantages of simple, practical, reliable, reduce electromagnetic interference, can full play sleeve pipe end screen many monitoring volumes for inside overvoltage amplitude and the partial discharge signal of analytical transformer etc.
Drawings
Fig. 1 is a schematic diagram of a system block structure of the present invention;
FIG. 2 is a flow chart of the present invention;
FIG. 3 is a schematic structural diagram of an integrated sensor module for over-voltage and partial discharge according to the present invention;
fig. 4 is a schematic structural diagram of the capacitive sensor of the present invention;
FIG. 5 is a schematic diagram of the voltage signal detection principle of the integrated sensor module for over-voltage and partial discharge according to the present invention;
fig. 6 is a schematic structural view of the small current sensor of the present invention.
The system comprises a transformer bushing monitored object 1, an overvoltage and partial discharge comprehensive sensor module 2, a coaxial cable transmission module 3, an attenuation and low-pass filtering module 4, a band-pass filtering and amplifying device module 5, a data acquisition device module 6, a data analysis, display, storage and transmission module 7, a data monitoring and diagnosis module 8, a bushing end screen butt joint 9, a transformer bushing 11, a high-voltage guide rod 12, a capacitor plate 13, a bushing end screen special interface 14, a capacitor sensor 21, a broadband micro current sensor 22, a metal guide rod 23 and a metal shielding shell 24.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are partial embodiments of the present invention, rather than all embodiments.
The principle of the utility model is that a special interface is designed for the transformer bushing end screen, the end screen is reliably grounded after being connected with an inductionless capacitor in series through a metal guide rod, the overvoltage signal measurement of bushing capacitance and inductionless capacitor partial pressure is formed, meanwhile, a broadband micro-current sensor (high-frequency CT) is utilized to measure local discharge pulse current signals on the metal guide rod, the integrated sensor of the bushing end screen which is packaged through a metal shield and is provided with integrated sensors for simultaneously measuring overvoltage waveforms and local discharge pulse current signals is designed, and transformer local discharge and overvoltage integrated monitoring methods and systems based on the bushing end screen are formed through filtering amplification and data analysis and processing by utilizing a dual-channel data acquisition device.
As shown in figure 1, transformer overvoltage and partial discharge comprehensive monitoring systems based on a sleeve end screen comprise a transformer sleeve monitored object 1, an overvoltage and partial discharge comprehensive sensor module 2, a coaxial cable transmission module 3, an attenuation and low-pass filtering module 4, a band-pass filtering and amplifying device module 5, a data acquisition device module 6, a data analysis, display, storage and transmission module 7 and a data monitoring and diagnosis module 8, wherein the transformer sleeve monitored object 1 is sequentially connected with the coaxial cable transmission module 3, the attenuation and low-pass filtering module 4, the data acquisition device module 6, the data analysis, display, storage and transmission module 7 and the data monitoring and diagnosis module 8 through the overvoltage and partial discharge comprehensive sensor module 2 to form a transformer overvoltage waveform detection loop based on the sleeve end screen, the transformer monitored sleeve object 1 is sequentially connected with the shaft cable transmission module 3, the band-pass filtering and amplifying device module 5, the data acquisition device module 6, the data analysis, display, storage and transmission module 7 and the data monitoring and diagnosis module 8 through the overvoltage and partial discharge comprehensive sensor module 2 to form an electric pulse detection loop based on the partial discharge current signal of the transformer end screen.
The monitored object 1 of the transformer bushing comprises a transformer bushing 11, a high-voltage guide rod 12, a capacitance pole plate 13 and a special bushing end screen interface 14, and the comprehensive overvoltage and partial discharge sensor module 2 is connected with the special bushing end screen interface 14 through a bushing end screen butt joint 9.
As shown in fig. 3, the integrated overvoltage and partial discharge sensor module 2 includes a capacitive sensor 21, a broadband micro current sensor 22, a metal guide rod 23 and a metal shielding case 24, the capacitive sensor 21 and the broadband micro current sensor 22 are packaged in the metal shielding case 24, the metal guide rod 23 is inserted into the metal shielding case 24, and the metal shielding case 24 is reliably grounded.
The capacitance sensor 21 is connected with the special interface 14 for the sleeve end screen through a metal guide rod 23 and the sleeve end screen butt joint 9 in sequence.
As shown in fig. 4, the capacitance sensor 21 is a capacitance sensor manufactured by connecting 8 axisymmetric non-inductive capacitors in parallel.
As shown in fig. 5, the capacitance sensor is butted with the special interface for transformer bushing end screen by using a bushing end screen butt joint through a metal guide rod, so as to form an overvoltage waveform detection coupling device based on the principle of voltage division of the capacitance of the transformer bushing C1 and the capacitance sensor C2, and the initial voltage division ratio k is C2/C1. Before transmitting to a data acquisition device through a coaxial cable, secondary voltage division (amplitude attenuation) is needed, and low-pass filtering is carried out to filter out high-frequency background electromagnetic noise signals. In order to ensure the transient characteristic of the overvoltage waveform detection coupling device, 8 axisymmetric non-inductive capacitors are connected in parallel to reduce the overall inductance of the capacitive sensor.
The broadband micro current sensor 22 couples the partial discharge pulse current signal inside the transformer by measuring the high-frequency grounding current signal on the metal guide rod 23.
As shown in fig. 6, the core of the wide-band micro-current sensor 22 is made of manganese-zinc ferrite.
The broadband micro current sensor 22 is a hollow through sensor.
Wherein, the parameters of the related sensors and data acquisition are respectively defined as follows:
(1) capacitive sensor
Disc radius: 15 cm;
input impedance: 200 omega;
capacitance value: matching the actual transformer bushing capacitance to enable the initial voltage division ratio to be 1000;
effective bandwidth: 300 MHz-3000 MHz.
(2) Broadband micro current sensor
Iron core material: manganese zinc ferrite;
the structural form is as follows: hollow piercing type;
simulating the bandwidth: 30 MHz;
the processing technology comprises the following steps: MEMS technology.
(3) Overvoltage waveform signal acquisition
Detecting a frequency band: 300 MHz-10 MHz;
a detection channel: 1 CH;
low-pass filtering bandwidth: 0-50 MHz;
sampling rate: 100 MS/s;
(4) local discharge pulse current signal acquisition
Detecting a frequency band: 0-30 MHz;
a detection channel: 1 CH;
band-pass filtering bandwidth: 10 kHz-30 MHz;
sensitivity: less than or equal to 1 mV;
sampling rate: 100 MS/s;
(5) display and analysis
Displaying: discharge amplitude, phase, waveform, and PRPD spectrogram;
and (3) analysis: signal trend analysis, pattern recognition, etc.
As shown in fig. 2, the work flow of the present invention includes the following steps:
step 1, designing a special interface based on a sleeve end screen and grounding thereof, and designing a capacitor and a broadband micro current sensor (high-frequency CT) into a comprehensive sensor for measuring overvoltage waveforms and local discharge pulse current signals;
step 2, installing and arranging the comprehensive sensor based on a sleeve tap interface, and connecting the comprehensive sensor with 2 measurement loops of monitoring signals;
step 3, converting the overvoltage signal of the transformer into a voltage waveform signal which can be collected after secondary voltage division (attenuation) and low-pass filtering based on a capacitance voltage division principle; partial discharge pulse current signals in the transformer are converted based on high-frequency CT on a metal guide rod of a bushing end screen, and converted into voltage waveform signals which can be collected after band-pass filtering and amplification;
and 5, transmitting the analysis result to a data monitoring and fault diagnosis center, and providing a basis for transformer state evaluation and production command for operators on duty.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
- The comprehensive monitoring system for the overvoltage and the partial discharge of the transformer based on the bushing end screen is characterized by comprising a transformer bushing monitored object (1), an overvoltage and partial discharge comprehensive sensor module (2), a coaxial cable transmission module (3), an attenuation and low-pass filtering module (4), a band-pass filtering and amplifying device module (5), a data acquisition device module (6), a data analysis, display, storage and transmission module (7) and a data monitoring and diagnosis module (8);the transformer bushing monitored object (1) is sequentially connected with a coaxial cable transmission module (3), an attenuation and low-pass filtering module (4), a data acquisition device module (6), a data analysis, display, storage and transmission module (7) and a data monitoring and diagnosis module (8) through an overvoltage and partial discharge comprehensive sensor module (2) to form a transformer overvoltage waveform detection loop based on a bushing end screen;the transformer bushing monitored object (1) is sequentially connected with a shaft cable transmission module (3), a band-pass filtering and amplifying device module (5), a data acquisition device module (6), a data analysis, display, storage and transmission module (7) and a data monitoring and diagnosis module (8) through an overvoltage and partial discharge comprehensive sensor module (2) to form a transformer partial discharge pulse current signal detection loop based on a bushing end screen.
- 2. The comprehensive transformer overvoltage and partial discharge monitoring system based on the bushing end screen is characterized in that the monitored object (1) of the transformer bushing comprises a transformer bushing (11), a high-voltage guide rod (12), a capacitance plate (13) and a special bushing end screen interface (14), and the comprehensive overvoltage and partial discharge sensor module (2) is connected with the special bushing end screen interface (14) through a bushing end screen butt joint (9).
- 3. The transformer overvoltage and partial discharge comprehensive monitoring system based on bushing end screen as claimed in claim 2, wherein the overvoltage and partial discharge comprehensive sensor module (2) comprises a capacitance sensor (21), a broadband micro current sensor (22), a metal guide rod (23) and a metal shielding shell (24), the capacitance sensor (21) and the broadband micro current sensor (22) are packaged in the metal shielding shell (24), the metal guide rod (23) is inserted into the metal shielding shell (24), and the metal shielding shell (24) is reliably grounded.
- 4. The comprehensive transformer overvoltage and partial discharge monitoring system based on bushing end screen as claimed in claim 3, wherein the capacitive sensor (21) is connected to the special bushing end screen interface (14) through a metal guide rod (23) and a bushing end screen butt joint (9) in sequence.
- 5. The comprehensive transformer overvoltage and partial discharge monitoring system based on bushing tap as claimed in claim 4, wherein the capacitance sensor (21) is a capacitance sensor made by 8 axisymmetric non-inductive capacitors in parallel.
- 6. The comprehensive transformer overvoltage and partial discharge monitoring system based on bushing end screen as claimed in claim 3, wherein the iron core of the wide-band micro current sensor (22) is made of Mn-Zn ferrite.
- 7. The comprehensive transformer overvoltage and partial discharge monitoring system based on bushing tap as claimed in claim 3, wherein the broadband micro current sensor (22) is a hollow-core sensor.
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| CN201822147259.5U CN210005622U (en) | 2018-12-20 | 2018-12-20 | Transformer overvoltage and partial discharge comprehensive monitoring system based on sleeve tap |
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| CN201822147259.5U CN210005622U (en) | 2018-12-20 | 2018-12-20 | Transformer overvoltage and partial discharge comprehensive monitoring system based on sleeve tap |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541412A (en) * | 2018-12-20 | 2019-03-29 | 国网上海市电力公司 | Transformer overvoltage and partial discharge comprehensive monitor system and method based on bottom shielding of bushing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541412A (en) * | 2018-12-20 | 2019-03-29 | 国网上海市电力公司 | Transformer overvoltage and partial discharge comprehensive monitor system and method based on bottom shielding of bushing |
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