CN108061845B - GIS partial discharge data acquisition device - Google Patents
GIS partial discharge data acquisition device Download PDFInfo
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- CN108061845B CN108061845B CN201711350025.4A CN201711350025A CN108061845B CN 108061845 B CN108061845 B CN 108061845B CN 201711350025 A CN201711350025 A CN 201711350025A CN 108061845 B CN108061845 B CN 108061845B
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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
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Abstract
The invention discloses a GIS partial discharge data acquisition device, which comprises a case shell, a channel conditioning module, a data acquisition module, a data transmission module and a power supply module, wherein the channel conditioning module, the data acquisition module, the data transmission module and the power supply module are arranged in the case shell; the power supply module is respectively connected with the channel conditioning module, the data acquisition module and the data transmission module to provide working voltages for the channel conditioning module, the data acquisition module and the data transmission module; the GIS partial discharge data acquisition device comprehensively applies computer technology, analog electronic technology, high-speed signal acquisition and anti-interference technology. The device can collect the ultrahigh frequency partial discharge signal of the GIS, analyze the signal and convert the processed ultrahigh frequency partial discharge analog signal into a digital signal, and finally adopt a standard protocol to transmit to the background through the TCP/IP Ethernet.
Description
Technical Field
The invention relates to power equipment, in particular to a GIS partial discharge data acquisition device.
Background
With the development of the power industry in China, the application of GIS is increasing. Because of the limitation of field conditions, the environmental temperature, humidity, cleanliness of air, precision of installation tools and installation process level are difficult to effectively control, dust particles or other foreign matters are easy to enter the bus barrel during field installation, the conductors are easy to damage, and the defects generate partial discharge under the operating voltage, so that insulation damage and even flashover are caused to a certain extent. Through analysis of the partial discharge detection data, potential safety hazards existing in the GIS can be found, and safe operation of the power grid is guaranteed. Aiming at the situation, the GIS partial discharge data acquisition device is very necessary to develop.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a GIS partial discharge data acquisition device which can timely and accurately acquire and transmit GIS partial discharge data.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a GIS partial discharge data acquisition device comprises a chassis shell, a channel conditioning module, a data acquisition module, a data transmission module and a power supply module, wherein the channel conditioning module, the data acquisition module, the data transmission module and the power supply module are arranged in the chassis shell; wherein,
the power supply module is respectively connected with the channel conditioning module, the data acquisition module and the data transmission module to provide working voltages for the channel conditioning module, the data acquisition module and the data transmission module;
the channel conditioning module comprises a GIS internal partial discharge signal channel conditioning unit and an external corona interference signal channel conditioning unit which are identical in structure; the GIS internal partial discharge signal channel conditioning unit is used for receiving the GIS internal partial discharge signal, filtering and amplifying the GIS internal partial discharge signal, and transmitting the filtered and amplified GIS internal partial discharge signal to the data acquisition module; the external corona interference signal channel conditioning unit is used for receiving external corona interference signals affecting GIS partial discharge measurement, filtering and amplifying the external corona interference signals, and transmitting the filtered and amplified external corona interference signals to the data acquisition module;
the data acquisition module comprises an interference elimination unit, an AD converter and a digital signal output end; the interference elimination unit is used for receiving the filtered and amplified GIS internal partial discharge signals and the filtered and amplified external corona interference signals, and eliminating the external corona interference signals contained in the filtered and amplified GIS internal partial discharge signals by utilizing the filtered and amplified external corona interference signals; the AD converter is used for converting the GIS internal partial discharge signal after the external corona interference signal is eliminated into a digital signal, and the converted digital signal is output to the data transmission module through the digital signal output end;
the data transmission module is used for transmitting the received digital signals to the background data analysis system.
Three partial discharge signal channel conditioning units in the GIS are arranged, and one external corona interference signal channel conditioning unit is arranged.
The amplification factor of the conditioning unit of the GIS internal partial discharge signal channel conditioning unit and the external corona interference signal channel conditioning unit is 10000 times, and the filtering frequency band is 100MHz-3000MHz.
The GIS internal partial discharge signal channel conditioning unit and the external corona interference signal channel conditioning unit comprise capacitors C4, C6 and C9, resistors R5, R7, R3, R4, R16, R100 and R10, a first amplifier and a second amplifier; the input end of the capacitor C4 is a signal input end, the output end of the capacitor C4 is respectively connected with one ends of the resistors R5 and R7 and the positive electrode of the first amplifier, and the other end of the resistor R7 is grounded; one end of the resistor R3 is grounded, the other end is connected with the negative electrode of the first amplifier and one end of the resistor R4, the output end of the first amplifier is connected with one end of the capacitor C6 and the other end of the resistor R4 respectively, the other end of the capacitor C6 is connected with one end of the resistor R16, the other end of the resistor R16 is connected with one end of the capacitor C9, one end of the resistor R100 and the positive electrode of the second amplifier, the other end of the capacitor C9 and the other end of the resistor R100 are grounded respectively, the negative electrode of the second amplifier is connected with one end of the resistor R10, and the other end of the resistor R10 is grounded.
The capacitors C4, C6 and C9 are noninductive capacitors, and the resistors R5, R7, R3, R4, R16, R100 and R10 are bypass resistors, namely a first amplifier and a second amplifier.
The data transmission module adopts a standard protocol and transmits the digital signal to a background data analysis system through TCP/IP Ethernet.
The chassis shell is made of aluminum alloy materials.
The data transmission module adopts an Ethernet data transmission chip, and the transmission rate is 1000MHz.
Compared with the prior art, the invention has the beneficial effects that:
the GIS partial discharge data acquisition device provided by the embodiment can acquire GIS partial discharge data accurately in real time, and transmit the data to the background data analysis system in real time, and the safety hidden danger existing in the GIS can be found out by analyzing the GIS partial discharge detection data, so that the safe operation of the power grid is ensured.
Drawings
Fig. 1 is a working schematic diagram of a GIS partial discharge data acquisition device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the operation of the data acquisition module;
fig. 3 is a schematic circuit diagram of a channel conditioning module.
Detailed Description
The present invention will be described in further detail with reference to the drawings and detailed description.
Examples:
referring to fig. 1, a working schematic diagram of a GIS partial discharge data collection device according to this embodiment includes a chassis housing, and a channel conditioning module, a data collection module, a data transmission module and a power supply module installed in the chassis housing. The power supply module is respectively connected with the channel conditioning module, the data acquisition module and the data transmission module, and obtains 12V voltage through the POE port, converts the 12V voltage into +/-5V voltage and provides the +/-5V voltage for the channel conditioning unit, the data acquisition module and the data transmission module.
The channel conditioning module comprises a GIS internal partial discharge signal channel conditioning unit and an external corona interference signal channel conditioning unit which are identical in structure. The GIS internal partial discharge signal channel conditioning unit is used for receiving the GIS internal ultrahigh frequency signal, wherein the frequency range of the ultrahigh frequency signal is 100MHz-2000MHz, the partial discharge signal is filtered and amplified, the interference signal is eliminated by the partial discharge signal, the signal to noise ratio is improved, and the filtered and amplified GIS internal ultrahigh frequency partial discharge signal is transmitted to the data acquisition module; the external corona interference signal channel conditioning unit is used for receiving external corona interference signals affecting GIS partial discharge measurement, filtering and amplifying the external corona interference signals, and transmitting the filtered and amplified external corona interference signals to the data acquisition module.
As shown in fig. 2, the data acquisition module includes an interference cancellation unit, an AD converter, and a digital signal output terminal. The interference elimination unit is used for receiving the filtered and amplified GIS internal ultrahigh frequency partial discharge signal and the filtered and amplified external corona interference signal, and eliminating the external corona interference signal contained in the filtered and amplified GIS internal ultrahigh frequency partial discharge signal by utilizing the filtered and amplified external corona interference signal, that is, the interference elimination unit performs diagnosis by receiving and collecting the GIS internal ultrahigh frequency partial discharge signal and the external corona interference signal and adopting a Q-phi statistical graph, wherein the Q-phi statistical graph describes the relation between amplitude and phase in a period of time, and generally the x-axis represents the phase and the y-axis represents the amplitude of the signal. The map equally divides a power frequency period (360 DEG) into a plurality of phase windows, the maximum discharge capacity Vs in each phase window is the discharge maximum amplitude, and the instantaneous discharge maximum value Vs is the discharge capacity of the S-th detection period in the phase window. The Vs is regarded as a phase (phi) function and represented by a histogram, and a Q-phi statistic can be made. The Q-phi statistics reflect the characteristics of the maximum discharge amplitude versus phase distribution. The Q-phi statistical graph relationship is utilized to eliminate the external corona interference signal internally discharged by the ultra-high frequency partial discharge signal in the GIS, so that the accuracy of data acquisition can be ensured; the AD converter is used for converting the GIS internal partial discharge signal after the external corona interference signal is eliminated into a digital signal, and the converted digital signal is output to the data transmission module through the digital signal output end.
And finally, the data transmission module transmits the received digital signals to a background data analysis system, and the background data analysis system analyzes the related dredging, so that potential safety hazards existing in the GIS can be timely found, and the safe operation of the power grid is ensured. Of course, it should be noted that the background data analysis system is not an integral part of the apparatus.
According to the analysis, the GIS partial discharge data acquisition device provided by the embodiment can acquire GIS partial discharge data accurately in real time, and transmit the data to the background data analysis system in real time, and through analyzing the GIS partial discharge detection data, potential safety hazards existing in the GIS can be found, so that the safe operation of a power grid is ensured.
As one preferable embodiment, three conditioning units of the GIS internal partial discharge signal channel are provided, which are CH1, CH2, and CH3 respectively; the external corona interference signal channel conditioning unit is provided with a three-phase integrated three-phase common GIS, the three GIS internal partial discharge signal channel conditioning units can respectively monitor the A phase, the B phase and the C phase, the three channel monitoring ranges can cover the whole GIS device, the other one channel monitors external interference, and the four-channel monitoring is the optimal configuration of GIS partial discharge monitoring.
As another preferable embodiment, the amplification factor of the conditioning unit for the GIS internal partial discharge signal channel conditioning unit and the external corona interference signal channel conditioning unit is 10000 times, and the filtering frequency band is 100MHz-3000MHz. Therefore, weak partial discharge signals can be effectively found, and the sensitivity of the system is improved.
Specifically, in this embodiment, as shown in fig. 3, the GIS internal partial discharge signal channel conditioning unit and the external corona interference signal channel conditioning unit each include capacitors C4, C6, and C9, resistors R5, R7, R3, R4, R16, R100, and R10, and a first amplifier and a second amplifier; the input end of the capacitor C4 is a signal input end, the output end of the capacitor C4 is respectively connected with one ends of the resistors R5 and R7 and the positive electrode of the first amplifier, and the other end of the resistor R7 is grounded; one end of the resistor R3 is grounded, the other end of the resistor R3 is connected with the negative electrode of the first amplifier and one end of the resistor R4, the output end of the first amplifier is connected with one end of the capacitor C6 and the other end of the resistor R4 respectively, the other end of the capacitor C6 is connected with one end of the resistor R16, the other end of the resistor R16 is connected with one end of the capacitor C9, one end of the resistor R100 and the positive electrode of the second amplifier, the other end of the capacitor C9 and the other end of the resistor R100 are grounded respectively, the negative electrode of the second amplifier is connected with one end of the resistor R10, and the other end of the resistor R10 is grounded to realize filtering amplification of signals.
The capacitors C4, C6 and C9 are all non-inductance capacitors, so that the filtering parameters are more accurate, the resistors R5, R7, R3, R4, R16, R100 and R10 are all bypass resistors, the bypass resistors have the characteristics of high precision, good temperature coefficient and the like, and the first amplifier and the second amplifier are ultra-high frequency, low noise and high gain chips so as to ensure high sensitivity of the measuring signals and large dynamic range.
In a specific embodiment, the data transmission module uses a standard protocol to transmit the digital signal to the background data analysis system via TCP/IP Ethernet.
The chassis shell is made of aluminum alloy, so that the impact of external force can be prevented, and the chassis shell has good electromagnetic compatibility.
The data transmission module adopts an Ethernet data transmission chip, and the transmission rate is 1000MHz so as to improve the data transmission speed.
The AD converter adopts a chip with wide frequency and high sampling rate, thereby ensuring that the frequency band of the detectable signal reaches 100MHz-2000MHz, ensuring that the peak value of the ultrahigh frequency signal is effectively detected by the high sampling rate, and measuring the ultrahigh frequency signal is stable.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the essence of the present invention are intended to be included within the scope of the present invention.
Claims (2)
1. The GIS partial discharge data acquisition device is characterized by comprising a case shell, a channel conditioning module, a data acquisition module, a data transmission module and a power supply module, wherein the channel conditioning module, the data acquisition module, the data transmission module and the power supply module are arranged in the case shell; wherein,
the power supply module is respectively connected with the channel conditioning module, the data acquisition module and the data transmission module to provide working voltages for the channel conditioning module, the data acquisition module and the data transmission module;
the channel conditioning module comprises a GIS internal partial discharge signal channel conditioning unit and an external corona interference signal channel conditioning unit which are identical in structure; the GIS internal partial discharge signal channel conditioning unit is used for receiving the GIS internal partial discharge signal, filtering and amplifying the GIS internal partial discharge signal, and transmitting the filtered and amplified GIS internal partial discharge signal to the data acquisition module; the external corona interference signal channel conditioning unit is used for receiving external corona interference signals affecting GIS partial discharge measurement, filtering and amplifying the external corona interference signals, and transmitting the filtered and amplified external corona interference signals to the data acquisition module;
the data acquisition module comprises an interference elimination unit, an AD converter and a digital signal output end; the interference elimination unit is used for receiving the filtered and amplified GIS internal partial discharge signals and the filtered and amplified external corona interference signals, and eliminating the external corona interference signals contained in the filtered and amplified GIS internal partial discharge signals by utilizing the filtered and amplified external corona interference signals; the AD converter is used for converting the GIS internal partial discharge signal after the external corona interference signal is eliminated into a digital signal, and the converted digital signal is output to the data transmission module through the digital signal output end;
the data transmission module is used for transmitting the received digital signals to the background data analysis system;
three partial discharge signal channel conditioning units inside the GIS are arranged, and one external corona interference signal channel conditioning unit is arranged;
the amplification factors of the GIS internal partial discharge signal channel conditioning unit and the external corona interference signal channel conditioning unit are 10000 times, and the filtering frequency bands are 100MHz-3000 MHz;
the GIS internal partial discharge signal channel conditioning unit and the external corona interference signal channel conditioning unit comprise capacitors C4, C6 and C9, resistors R5, R7, R3, R4, R16, R100 and R10, a first amplifier and a second amplifier; the input end of the capacitor C4 is a signal input end, the output end of the capacitor C4 is respectively connected with one ends of the resistors R5 and R7 and the positive electrode of the first amplifier, and the other end of the resistor R7 is grounded; one end of the resistor R3 is grounded, the other end of the resistor R3 is connected with the negative electrode of the first amplifier and one end of the resistor R4, the output end of the first amplifier is respectively connected with one end of the capacitor C6 and the other end of the resistor R4, the other end of the capacitor C6 is connected with one end of the resistor R16, the other end of the resistor R16 is connected with one end of the capacitor C9, one end of the resistor R100 and the positive electrode of the second amplifier, the other end of the capacitor C9 and the other end of the resistor R100 are respectively grounded, the negative electrode of the second amplifier is connected with one end of the resistor R10, and the other end of the resistor R10 is grounded;
the data transmission module adopts a standard protocol, and transmits the digital signal to a background data analysis system through a TCP/IP Ethernet;
the chassis shell is made of aluminum alloy materials.
2. The GIS partial discharge data collection apparatus of claim 1, wherein the data transmission module employs an ethernet data transmission chip with a transmission rate of 1000MHz.
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| CN109342905A (en) * | 2018-12-04 | 2019-02-15 | 国家电网有限公司 | A kind of space shelf depreciation interference positioning device and localization method |
| CN111366822A (en) * | 2020-04-08 | 2020-07-03 | 上海格鲁布科技有限公司 | Power frequency phase device based on POE broadcast mode |
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| TWI385911B (en) * | 2008-11-27 | 2013-02-11 | Inventec Corp | Fan controlling circuit |
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| CN207742288U (en) * | 2017-12-15 | 2018-08-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of GIS partial discharge data acquisition device |
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