CN106226603B - Corona loss measurement system and method for high-voltage alternating-current transmission line - Google Patents
Corona loss measurement system and method for high-voltage alternating-current transmission line Download PDFInfo
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The invention discloses a high-voltage alternating current transmission line corona loss measuring system, which comprises: the high-voltage line voltage measuring module is used for transmitting the measured high-voltage signal to the high-voltage line data acquisition module in real time; the resistance sensor is used for measuring a corona current signal and transmitting the corona current signal to the data acquisition module on the high voltage wire; the high-voltage on-line data acquisition module is used for synchronously acquiring the high-voltage signal and the corona current signal in a double-channel synchronous acquisition mode, respectively converting the high-voltage signal and the corona current signal into two optical signals and then transmitting the two optical signals to the high-voltage off-line photoelectric conversion module by using an optical fiber transmission line; the high-voltage line lower photoelectric conversion module is used for respectively converting the two optical signals into two electric signals through photoelectric conversion and transmitting the two electric signals to an upper computer for processing; the upper computer receives the two electric signals transmitted by the photoelectric conversion module under the high-voltage wire and calculates the corona loss; and the power supply module adopts a storage battery pack for supplying power, so that the system can work normally.
Description
Technical Field
The present invention relates to the field of metrology calibration, and more particularly, to a system and method for measuring corona loss of a high voltage ac transmission line.
Background
In order to implement national energy policies and ensure comprehensive, coordinated and sustainable health development of the power industry, national grid companies put forward important strategic measures for accelerating development of the AC/DC extra-high voltage power grid according to national conditions. The ultra-high voltage transmission is developed on the basis of ultra-high voltage transmission, can realize long-distance and large-capacity transmission of electric energy, and is suitable for interconnection of large-area power grids.
In the selection of the ultra-high voltage transmission mode, which transmission mode is good or which transmission mode is poor cannot be simply said, and the advantage of the ultra-high voltage transmission can be exerted only by specifically selecting according to specific conditions. On the selection of the voltage class of the extra-high voltage alternating-current transmission, the selection of the 1000kV voltage class is more economical and reasonable through a series of experimental demonstration based on the actual requirement; after the voltage class is selected, transmission loss at the voltage class, such as heating loss generated when a wire passes through a current and corona loss generated when a corona current is generated, needs to be considered in the process of transmitting high voltage by the power transmission line. The efficiency of the ultra-high voltage alternating current transmission can be calculated only by obtaining specific transmission loss, and meanwhile, the ultra-high voltage alternating current transmission mode is improved according to the generation condition and the generation characteristics of the transmission loss. Therefore, it is very important to study the transmission loss of the extra-high voltage ac transmission line. Under the condition of good weather conditions, the extra-high voltage alternating current transmission line is not easy to generate corona current, the main transmission loss of the extra-high voltage transmission line is resistance heating loss on the electric wire, under certain special conditions, such as high altitude and remote areas, the weather of the line passing through the areas is very bad, the proportion of rain, snow, frost and fog day in the whole year is large, and the corona loss can become the main aspect of electric energy loss. Therefore, the research on the corona loss of the transmission line is one of the key technologies of the 1000kV extra-high voltage transmission and transformation project in China.
In the foreign aspect, after the 50 th of the 20 th century, test line segments are successively built in the United states, Su, plus, mean, method and day to measure and research the corona loss, but because the transmission voltage grades of various countries have limits, most countries only research the corona loss of the ultrahigh voltage transmission line, and only countries such as the United states and Italy can carry out related experiments on the ultrahigh voltage transmission line.
In China, the 20 th century and the 80 th century begin, units such as the Chinese institute of electrical science, the institute of high-voltage electrical appliances, the national institute of electrical science and the national grid institute of electrical science and the like have studied the corona loss of the transmission lines with different voltage grades, but due to relative lack of experimental conditions, the research contents lack diversity, and the research on the corona loss of the alternating-current ultrahigh-voltage transmission lines in complex weather is relatively less. Until 1995, the national network Wuhan high-voltage research institute builds an extra-high voltage test line section of an outdoor test field, and the alternating-current transmission voltage level is improved to 1000kV, so that research units in China can not perform research work on extra-high voltage 1000kV alternating-current transmission system engineering, and a foundation is laid for accelerating planning and construction processes of a national main power grid and following a technical policy of absorbing international advanced technologies and experiences, fully considering technical maturity and gradually realizing nationalization. In order to research the corona loss characteristics of the ultra-high voltage alternating current transmission line under the weather conditions of rain and snow, Liuyunpeng and the like of the North China electric power university develop a photoelectric digital transmission line corona loss monitoring system, and the system is tested on a single-loop test line segment of an ultra-high voltage alternating current test base in China. The high-voltage direct-current transmission line corona loss measuring system is developed by cooperation of China institute of electrical sciences and Beijing university of aerospace, has accurate measuring result and strong electrical breakdown resistance, can stably run for a long time under ultra/extra-high voltage direct-current environment and various severe natural environment conditions, adopts a split structure, is easy to install and maintain on site, but is not suitable for high-voltage alternating-current transmission line corona loss measurement.
The current research situation of the measurement technology of the ultrahigh voltage alternating current corona current at home and abroad is comprehensively analyzed, and the practical situation of the development of an ultrahigh voltage corona current measurement system is combined, so that the problems mainly exist at present:
1. the existing corona current measuring system is not optimized enough in structure, cannot cope with outdoor severe weather, and is easy to break down in extreme weather.
2. In the existing alternating current corona current measuring system, a corona current and voltage synchronous acquisition scheme is not perfect, and the synchronous precision is not high.
Disclosure of Invention
In order to solve the above problem, according to an aspect of the present invention, there is provided a corona loss measurement system of a high voltage alternating current transmission line, the system including:
the high-voltage line voltage measurement module is used for transmitting the measured high-voltage signal to the high-voltage line data acquisition module in real time by using an optical fiber transmission line;
the resistance sensor is connected in series into the high-voltage alternating-current transmission line, measures a corona current signal and transmits the corona current signal to the data acquisition module on the high-voltage line;
the high-voltage on-line data acquisition module is used for synchronously acquiring the high-voltage signal and the corona current signal in a double-channel synchronous acquisition mode, respectively converting the high-voltage signal and the corona current signal into two optical signals and then transmitting the two optical signals to the high-voltage off-line photoelectric conversion module by using an optical fiber transmission line;
the high-voltage line lower photoelectric conversion module is used for respectively converting the two optical signals into two electric signals through photoelectric conversion and transmitting the two electric signals to an upper computer for processing;
the upper computer receives the two electric signals transmitted by the photoelectric conversion module under the high-voltage wire and calculates the corona loss; and
and the power supply module adopts a storage battery pack for supplying power, so that the system can work normally.
Preferably, the voltage measuring module on the high-voltage line is positioned in a cylindrical protective barrel made of metal materials, and grading rings are installed at two ends of the protective barrel.
Preferably, the voltage measuring module on the high voltage line is installed at the rear end of the high voltage generator.
Preferably, the voltage measurement module on the high voltage line includes: the device comprises a voltage transformer, a waveform conversion device and a photoelectric conversion transmitter group; the primary coil of the voltage transformer is connected in series with a high-voltage alternating-current circuit, the secondary coil of the voltage transformer is connected in series with a waveform conversion device and a photoelectric conversion transmitter, and the voltage transformer converts a measured voltage electric signal into an optical signal through the photoelectric conversion transmitter and transmits the optical signal to a data acquisition module on a high-voltage line.
Preferably, wherein data acquisition module setting is in same position department on the high-voltage line on resistance sensor and the high-voltage line, and data acquisition module all installs in the protection bucket on resistance sensor and the high-voltage line to reduce the influence of the complicated electromagnetic environment that high-voltage alternating current circuit produced to corona current signal.
Preferably, the data acquisition module on the high-voltage line comprises: the system comprises a collection card, a photoelectric converter and a control circuit board; the control circuit board is a pivot connected with the data acquisition module device on the high-voltage line and used for controlling the state of the data acquisition module device on the high-voltage line, and the photoelectric converter converts optical signals transmitted to the data acquisition module on the high-voltage line through an optical fiber transmission line into electric signals and transmits the electric signals to the acquisition card.
Preferably, the acquisition card converts the two collected electrical signals into two optical signals through photoelectric conversion, and then transmits the two optical signals to the photoelectric conversion module under the high-voltage line through the optical fiber transmission line.
Preferably, the data acquisition module on the high-voltage line is connected with the photoelectric conversion module under the high-voltage line through the optical fiber transmission line.
According to another aspect of the invention, there is provided a method of measuring corona loss of a high voltage ac transmission line, the method comprising:
the power supply module supplies power to the system by adopting a storage battery group, so that the system can work normally;
the high-voltage line voltage measurement module transmits a high-voltage signal obtained by measurement of the voltage transformer to the high-voltage line data acquisition module in real time by using an optical fiber transmission line;
measuring a corona current signal by using a resistance sensor and transmitting the corona current signal to a data acquisition module on a high-voltage wire;
the high-voltage line data acquisition module is used for synchronously acquiring the high-voltage signal and the corona current signal, respectively converting the high-voltage signal and the corona current signal into two optical signals and then transmitting the two optical signals to the high-voltage line photoelectric conversion module by using an optical fiber transmission line;
the photoelectric conversion module under the high-voltage wire respectively converts the two optical signals into two electric signals through photoelectric conversion and transmits the two electric signals to an upper computer for processing; and
the upper computer receives the two electric signals transmitted by the photoelectric conversion module under the high-voltage line and calculates corona loss;
preferably, the voltage measuring module on the high voltage line is installed at the rear end of the high voltage generator.
Preferably, the voltage measuring module on the high-voltage line is positioned in a cylindrical protective barrel made of metal materials, and grading rings are installed at two ends of the protective barrel.
Preferably, the voltage measurement module on the high voltage line includes: the device comprises a voltage transformer, a waveform conversion device and a photoelectric conversion transmitter group; the primary coil of the voltage mutual inductor is connected in series with a high-voltage alternating current circuit, the secondary coil of the voltage mutual inductor is connected in series with a waveform conversion device and a photoelectric conversion transmitter, and the voltage mutual inductor converts a measured voltage electric signal into an optical signal through the photoelectric conversion transmitter and transmits the optical signal to a data acquisition module on a high-voltage wire.
Preferably, the resistance sensor is connected in series into the high-voltage alternating-current transmission line.
Preferably, the data acquisition module on the high-voltage line adopts a dual-channel synchronous acquisition mode.
Preferably, wherein data acquisition module setting is in same position department on the high-voltage line on resistance sensor and the high-voltage line, and data acquisition module all installs in the protection bucket on resistance sensor and the high-voltage line to reduce the influence of the complicated electromagnetic environment that high-voltage alternating current circuit produced to corona current signal.
Preferably, the data acquisition module on the high-voltage line comprises: the system comprises a collection card, a photoelectric converter and a control circuit board; the control circuit board is a pivot connected with the data acquisition module device on the high-voltage line and used for controlling the state of the data acquisition module device on the high-voltage line, and the photoelectric converter converts optical signals transmitted to the data acquisition module on the high-voltage line through an optical fiber transmission line into electric signals and transmits the electric signals to the acquisition card.
Preferably, the acquisition card converts the two collected electrical signals into two optical signals through photoelectric conversion, and then transmits the two optical signals to the photoelectric conversion module under the high-voltage line through the optical fiber transmission line.
Preferably, the data acquisition module on the high-voltage line is connected with the photoelectric conversion module under the high-voltage line through the optical fiber transmission line.
The invention has the beneficial effects that:
1. the acquisition card in the data acquisition module on the high-voltage line adopts a double-channel synchronous acquisition mode, so that the synchronous precision of the acquired high-voltage signal and the acquired corona current signal is ensured, and the accuracy of the calculated corona loss is higher.
2. The resistance sensor and the data acquisition module on the high-voltage line are installed in a unified mode, the acquired electric signals are transmitted to the module on the high-voltage line through the optical fiber transmission line, the acquisition and processing processes of the high-voltage signals and the corona current signals are not affected by the external high-voltage electromagnetic environment to the maximum extent, and the electromagnetic shielding effect is good.
3. The connection of the voltage measurement module on the high-voltage line and the data acquisition module on the high-voltage line and the connection between the data acquisition module on the high-voltage line and the photoelectric conversion module under the high-voltage line all adopt optical fiber lines, so that the anti-interference capacity of a transmission line is strong, the effective distance of transmission is large, and the long-distance transmission between the voltage measurement module on the high-voltage line and the data acquisition module on the high-voltage line and the photoelectric conversion module under the high-voltage line can be met.
4. The corona loss measuring system of the high-voltage alternating-current transmission line can stably operate for a long time under various severe natural environment conditions, can perform corona loss tests of the high-voltage alternating-current transmission line under complex weather conditions, high altitude and other environments, obtains the relation between the weather conditions, the high altitude and other environments and the corona loss of the high-voltage alternating-current transmission line, optimizes the high-voltage alternating-current transmission network, and further generates remarkable social benefits and economic benefits.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
figure 1 shows a schematic diagram of a corona loss measurement system 100 according to an embodiment of the invention;
FIG. 2 illustrates a flow diagram of an on-high voltage line voltage measurement module in a corona loss measurement system, according to an embodiment of the invention;
FIG. 3 is a schematic diagram showing the structure of a circuit diagram of voltage signal waveform transmission in a corona loss measurement system according to an embodiment of the invention;
fig. 4 is a schematic structural diagram illustrating a protective barrel mounted on a test line segment in a corona loss measuring system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a data acquisition module and a resistance sensor on a high voltage line of a protective barrel in a corona loss measurement system according to an embodiment of the invention;
FIG. 6 shows a schematic diagram of an acquisition device employed in a corona loss measurement system according to an embodiment of the present invention;
FIG. 7 shows a schematic diagram of the logic of a control circuit board in a corona loss measurement system according to an embodiment of the invention;
figure 8 shows a schematic diagram of the connection of the underside equipment of the high voltage line in a corona loss measurement system according to an embodiment of the invention;
FIG. 9 shows a flow chart of functions performed by an upper computer in a corona loss measurement system according to an embodiment of the invention;
figure 10 shows a flow diagram of a method 1000 of corona loss measurement according to an embodiment of the invention; and
fig. 11 shows a schematic diagram of an ac 1000kV high-voltage same-tower double-loop tower of a bar state extra-high voltage tower test base according to an embodiment of the invention.
Wherein, 1, 7 are test line segments, 2, 6 are tube buses, 3, 5, 8, 13, 14, 15 are grading rings, 4 is a protective barrel, 9, 16 are outdoor optical fibers, 10, 12 are load-bearing insulators, 11 are optical fiber insulators, 17, 18 are optical fiber adapter boxes, 41 are tube buses, 42, 48 are metal flanges, 43, 45 are insulating flanges, 44 are PE tubes, 46 are grading rings, 47 are optical fiber interfaces, 49 is a tube bus opening, 410 is a tube bus opening top cover, A1 is a high-voltage generator, A2 is a tube bus, A3 is a high-voltage tower pole, A4 is an overhead conductor, and A5 is a load-bearing insulator.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 shows a schematic structural diagram of a corona loss measurement system 100 according to an embodiment of the invention. As shown in fig. 1, a corona loss measurement system 100 includes: the system comprises a voltage measuring module 101 on the high-voltage line, a resistance sensor 102, a data acquisition module 103 on the high-voltage line, a photoelectric conversion module 104 under the high-voltage line, an upper computer 105 and a power supply module 106. The high-voltage line voltage measurement module 101 transmits the measured high-voltage signal to the high-voltage line data acquisition module 103 in real time by using an optical fiber transmission line. Preferably, the voltage measuring module 101 is located in a cylindrical protective barrel made of metal material, and grading rings are installed at two ends of the protective barrel. Preferably, the voltage measuring module 101 is installed at the rear end of the high voltage generator. Preferably, the module 101 for measuring the voltage on the high-voltage line comprises: the device comprises a voltage transformer, a waveform conversion device and a photoelectric conversion transmitter group; the primary coil of the voltage transformer is connected in series with a high-voltage alternating-current line, the secondary coil of the voltage transformer is connected in series with a waveform conversion device and a photoelectric conversion transmitter, and the voltage transformer converts a measured high-voltage electric signal into an optical signal through the photoelectric conversion transmitter and transmits the optical signal to the data acquisition module 103 on the high-voltage line.
Fig. 2 shows a flow diagram of an on-high voltage line voltage measurement module in a corona loss measurement system according to an embodiment of the invention. As shown in fig. 2, the voltage measurement module 101 on the high voltage line converts the power frequency sinusoidal ac high voltage signal generated by the high voltage generator into a low voltage signal, and directly converts the analog low voltage signal into an optical signal, and then transmits the optical signal to the data acquisition module 103 on the high voltage line in real time through the optical cable transmission line.
Fig. 3 is a schematic diagram showing a circuit diagram of voltage signal waveform transmission in the corona loss measuring system according to the embodiment of the present invention. As shown in fig. 3, the high-voltage signal waveform transmission circuit from the high-voltage on-line voltage measurement module 101 to the high-voltage on-line data acquisition module 103 is composed of an HFBR1414 photo-emitter module, an optical cable, an HFBR2416 photo-receiver, and a conditioning circuit. The specific principle is as follows: the optical fiber transmitter HFBR1414 is driven by a constant current source circuit to convert an input sine wave voltage signal into an optical signal, the optical signal is transmitted to the HFBR2416 photoelectric receiver through an optical fiber cable, the HFBR2416 photoelectric receiver converts the optical signal into an electric signal and then outputs the electric signal from the 2 pin, and the signal output from the 2 pin is conditioned due to the fact that the long-distance transmission signal has distortion such as attenuation and offset.
Preferably, the resistance sensor 102 is connected in series to the high voltage ac transmission line, measures the corona current signal, and transmits the measured corona current signal to the data acquisition module 103 on the high voltage line. Preferably, the resistance sensor 102 and the data acquisition module 103 on the high-voltage line are arranged at the same position on the high-voltage line, and both the resistance sensor and the data acquisition module on the high-voltage line are installed in the protection barrel, so as to reduce the influence of the complex electromagnetic environment generated by the high-voltage alternating-current line on the corona current signal. Fig. 4 is a schematic structural diagram illustrating a protective barrel installed on a test line segment in a corona loss measuring system according to an embodiment of the present invention. As shown in fig. 4, the protective barrel 4 is suspended between two tubular busbars 2 and 6, connected by grading rings 3 and 5. The bearing insulators 10 and 12 suspend the tubular buses 2 and 6 and the test line sections 1 and 7, optical fibers pass through the optical fiber insulator 11 and are connected with outdoor optical fibers 16 and 9 through adapter boxes 17 and 18 at two ends, the other end of the outdoor optical fiber 9 is connected with an outdoor optical fiber interface 47 of the protection barrel 4, and the other end of the outdoor optical fiber 16 is connected with a high-voltage line lower photoelectric conversion module 104 and a high-voltage line upper voltage measurement module 101. After the signals are acquired by the data acquisition module 103 on the high-voltage line in the protection barrel, the signals are transmitted to the optical fiber insulator 11 through the outdoor optical fiber 9 and transmitted to the outdoor optical fiber 16 through the optical fiber insulator 11, the outdoor optical fiber 16 is two sections of long-distance outdoor optical cables, one section of the long-distance outdoor optical cables is used for connecting the voltage measurement module 101 on the high-voltage line with the data acquisition module 103 on the high-voltage line, the voltage waveform acquired by the voltage measurement module 101 on the high-voltage line is transmitted to the data acquisition module 103 on the high-voltage line in real time, the other section of the long-distance outdoor optical cables is connected with the photoelectric conversion module 104 under the high-.
Fig. 5 is a schematic diagram illustrating a data acquisition module and a resistance sensor on a high voltage line of a protection barrel in a corona loss measurement system according to an embodiment of the invention. As shown in fig. 5, the data acquisition module 103 on the high voltage line is installed in the tubular bus 41 through the tubular bus opening 49, and the top cover of the tubular bus opening is fixed 410 by 4 hexagon socket head nuts, and the data acquisition module on the high voltage line is electromagnetically shielded by the tubular bus, so that the acquired signals are not affected by external strong electromagnetic interference, and the safety and reliability of the equipment under the complex meteorological conditions are ensured. The resistance sensor 102 is placed in the PE pipe 44, the data acquisition module 103 on the high-voltage line is respectively connected to two ends of the resistance sensor 102 through a shielded twisted pair, and when there is current in the resistance, the data acquisition module 103 on the high-voltage line can acquire voltage data at two ends of the resistance sensor 102.
Preferably, the data acquisition module 103 on the high voltage line adopts a dual-channel synchronous acquisition mode to perform synchronous acquisition on the high voltage signal and the corona current signal, and the two signals are respectively converted into two optical signals and then transmitted to the photoelectric conversion module 104 under the high voltage line by using an optical fiber transmission line. Preferably, the data acquisition module 103 on the high voltage line comprises: the system comprises a collection card, a photoelectric converter and a control circuit board; the control circuit board is a pivot connected with the data acquisition module 103 on the high-voltage line, controls the state of the data acquisition module 103 on the high-voltage line, and the photoelectric converter converts optical signals transmitted to the data acquisition module 103 on the high-voltage line through an optical fiber transmission line into electric signals and transmits the electric signals to the acquisition card.
Fig. 6 shows a schematic structural diagram of an acquisition device employed in a corona loss measurement system according to an embodiment of the present invention. As shown in fig. 6, the synchronous acquisition method of the acquisition device is to transmit the high-voltage waveform signal and the corona current signal to the same spatial orientation, and then perform synchronous signal acquisition by using the multi-channel synchronous acquisition technology of the acquisition device. Preferably, the acquisition card converts the two collected electrical signals into two optical signals through photoelectric conversion, and then transmits the two optical signals to the high-voltage line lower photoelectric conversion module 104 through the optical fiber transmission line. Preferably, the data acquisition module 103 on the high-voltage line is connected to the photoelectric conversion module 104 under the high-voltage line through the optical fiber transmission line.
Figure 7 shows a logical schematic diagram of a control circuit board in a corona loss measurement system according to an embodiment of the invention. As shown in fig. 7, the control circuit board is used as a control core part of the high-voltage line data acquisition module 103 and is a hub for connecting devices of the high-voltage line data acquisition module 103, and the control circuit board can control the device state of the high-voltage line data acquisition module 103.
The control circuit board mainly completes six tasks: 1) equipment power supply: in the data acquisition module 103 on the high-voltage line, the working voltages of various devices are different, wherein the working voltage of an acquisition card is +6V, the working voltage of a USB-optical fiber converter is +5V, the working voltage of a voltage waveform receiving device is +5V and-5V, a power supply chip is used for voltage conversion, a 12V battery is used for system power supply, a 5V power supply chip LM2576-5 runs all the time to provide a 5V power supply, the LM2678ADJ and the LM2678-5 are respectively switched on and off to control the power supply of the acquisition card and the USB-optical fiber converter, an LM2660 chip is selected to provide a-5V power supply, and meanwhile, the influence of a strong electromagnetic environment on the power supply of the devices is reduced by carrying out a certain electromagnetic shielding design on a PCB circuit board and peripheral electromagnetic protection measures, so that the stable running of the system is ensured; 2) voltage waveform receiving and conditioning: an optical fiber receiver and related circuits are integrated on the control circuit board, so that voltage waveform optical signals transmitted by the voltage measurement module 101 on the high-voltage line can be converted into electric signals, and the electric signals are transmitted to an acquisition card for acquisition after the waveforms are adjusted; 3) and (3) optical fiber switching: the control panel is integrated with a receiver of an optical fiber remote control switch, a transmitter of the optical fiber switch is positioned in the photoelectric conversion module under the high-voltage line, and the upper computer controls the light switch transmitting module, so that the power supply of the equipment can be remotely controlled, and the working state of the whole acquisition system is controlled; 4) signal measurement switching: the control circuit board is provided with an optical fiber switch measurement switching device, because the acquisition card used at this time only has 2 paths of signal input, and the whole system has three quantities to be measured: corona current, voltage waveform and battery voltage, therefore, the switching measurement of the signal is accomplished by a magnetic latching relay; 5) and (3) equipment overvoltage protection: because the voltage class of the working environment is about million volts, the sensing element and the acquisition card channel are easy to be damaged by instant high-voltage pulse, in order to prevent the situation, a protection circuit can be added at two ends of the resistor, and a P6KE15CA transient suppression diode TVS and a 2R-75V ceramic discharge diode are connected in parallel; 6) equipment short-circuit protection: for the acquisition module of the measurement system, the influence of high voltage on the acquisition module is not limited to the high-voltage line, and can also come from lightning attack in the lightning weather environment, so that short-circuit protection is performed on all probes of the acquisition card in the lightning weather environment. The specific measure is that the COM end and the RESET end of the relay are respectively connected with the + level and the-level of a probe of the acquisition card, when the acquisition card is used, the COM end and the SET end of the relay are controlled to be disconnected through an optical fiber switch, and the acquisition card performs normal measurement; when the acquisition card is not measured, the optical fiber switch controls the relay to be closed to short circuit the acquisition card probe, and thus, the TVS tube and the gas discharge tube are added, so that the purpose of protecting the acquisition card can be achieved.
Preferably, the two optical signals are respectively converted into two electrical signals by the high-voltage line lower photoelectric conversion module 104 through photoelectric conversion, and the two electrical signals are transmitted to the upper computer 105 for processing. Fig. 8 shows a schematic connection diagram of a device on the lower side of a high voltage line in a corona loss measuring system according to an embodiment of the invention. As shown in fig. 8, the high-voltage line lower photoelectric conversion module 104 is connected to a high-performance computer through a USB interface and a serial interface, the two are installed in a control room having a distance from a test line segment, a controller operates the high-performance computer to send a control command in the form of an electrical signal by implementing a programmed acquisition program and a human-computer interface, and the high-voltage line lower photoelectric conversion module 104 converts the electrical signal into an optical signal and transmits the optical signal to the upper side of the high-voltage line of the measurement system through an outdoor optical fiber to control the equipment on the upper side of the high-voltage line.
Preferably, the upper computer 105 receives the two electrical signals transmitted by the photoelectric conversion module 104 under the high-voltage line and calculates the corona loss. Figure 9 shows a flow chart of functions performed by an upper computer in a corona loss measurement system according to an embodiment of the invention. As shown in fig. 9, the upper computer 105 is connected to the low-voltage line photoelectric conversion module 104 through a USB interface and a serial interface, and first opens a connection port to enter a manual acquisition interface, and if so, enters a measurement system interface, otherwise, returns to the open port interface again; after entering the interface of the measuring system, turning on the power supply of the on-line module, judging whether the electric quantity is sufficient, if so, initializing the acquisition card, wherein the acquisition card is a dual-channel synchronous acquisition, then setting a storage path and a voltage and current grade, and if not, directly ending the whole measuring process; setting a storage path and judging whether to automatically collect or not after voltage and current grades are finished, and if so, automatically collecting, processing and storing data; otherwise, a manual acquisition mode is adopted to acquire, process and store the data; the measurement process is then ended and the power to the on-line module is turned off, and the measurement process is ended. In the whole system, the upper computer receives, stores and processes the high-voltage signal and the corona current signal so as to obtain the required corona loss.
Preferably, the power supply module 106 supplies power by using a storage battery pack to ensure that the system can work normally.
Figure 10 shows a flow diagram of a method 1000 of corona loss measurement according to an embodiment of the invention. As shown in fig. 10, the method for measuring corona loss starts from step 1001, and in step 1001, the power supply module supplies power to the system by using the storage battery pack, so as to ensure that the system can work normally.
Preferably, in step 1002, the voltage measurement module on the high voltage line transmits the high voltage signal measured by the voltage transformer to the data acquisition module on the high voltage line in real time by using the optical fiber transmission line. Preferably, the voltage measuring module on the high voltage line is installed at the rear end of the high voltage generator. Preferably, the voltage measuring module on the high-voltage line is positioned in a cylindrical protective barrel made of metal materials, and grading rings are installed at two ends of the protective barrel. Preferably, the voltage measurement module on the high voltage line includes: the device comprises a voltage transformer, a waveform conversion device and a photoelectric conversion transmitter group; the primary coil of the voltage transformer is connected in series with a high-voltage alternating-current circuit, the secondary coil of the voltage transformer is connected in series with a waveform conversion device and a photoelectric conversion transmitter, and the voltage transformer converts a measured voltage electric signal into an optical signal through the photoelectric conversion transmitter and transmits the optical signal to a data acquisition module on a high-voltage line.
Preferably, the corona current signal is measured at step 1003 using a resistance sensor and transmitted to a data acquisition module on the high voltage line. Preferably, the resistance sensor is connected in series into the high-voltage alternating-current transmission line.
Preferably, in step 1004, the data acquisition module on the high-voltage line acquires the high-voltage signal and the corona current signal synchronously, and converts the signals into two optical signals respectively, and then transmits the two optical signals to the photoelectric conversion module under the high-voltage line by using the optical fiber transmission line. Preferably, the data acquisition module on the high-voltage line adopts a dual-channel synchronous acquisition mode. Preferably, wherein data acquisition module setting is in same position department on the high-voltage line on resistance sensor and the high-voltage line, and data acquisition module all installs in the protection bucket on resistance sensor and the high-voltage line to reduce the influence of the complicated electromagnetic environment that high-voltage alternating current circuit produced to corona current signal. Preferably, the data acquisition module on the high-voltage line comprises: the system comprises a collection card, a photoelectric converter and a control circuit board; the control circuit board is a pivot connected with the data acquisition module device on the high-voltage line and used for controlling the state of the data acquisition module device on the high-voltage line, and the photoelectric converter converts optical signals transmitted to the data acquisition module on the high-voltage line through an optical fiber transmission line into electric signals and transmits the electric signals to the acquisition card. Preferably, the acquisition card converts the two collected electrical signals into two optical signals through photoelectric conversion, and then transmits the two optical signals to the photoelectric conversion module under the high-voltage line through the optical fiber transmission line.
Preferably, in step 1005, the two optical signals are respectively converted into two electrical signals through photoelectric conversion by the photoelectric conversion module under the high-voltage line, and the two electrical signals are transmitted to the upper computer for processing. Preferably, the data acquisition module on the high-voltage line is connected with the photoelectric conversion module under the high-voltage line through the optical fiber transmission line.
Preferably, the upper computer receives the two electrical signals transmitted by the photoelectric conversion module under the high-voltage line and calculates the corona loss in step 1006.
Fig. 11 shows a schematic diagram of an ac 1000kV high-voltage same-tower double-loop tower of a bar state extra-high voltage tower test base according to an embodiment of the invention. As shown in fig. 11, an application platform of the high-voltage ac transmission line corona loss measurement system is an ac 1000kv high-voltage co-tower double-circuit tower of a bar extra-high voltage tower test base. The high-voltage line upper voltage measuring module is installed behind a high-voltage generator A1, the high-voltage line upper data acquisition module and the resistance sensor are installed in the protective barrel in a unified mode and are installed below a bearing insulator A5 in a hanging mode, outdoor optical fibers are used for connecting the high-voltage line upper data acquisition module with the high-voltage line lower photoelectric conversion module and the high-voltage line upper voltage measuring module through the optical fiber insulators, and the high-voltage line lower photoelectric conversion module is connected with an upper computer.
When carrying out the relevant experiment of extra-high voltage alternating current transmission line corona loss measurement, at first add voltage to the wire section, the control personnel control high voltage generator at the room that steps up and progressively produce the high voltage of interchange as required, transmit to overhead conductor through the pipe generating line on, overhead conductor one end adds extra-high voltage, and one end is unsettled in addition. During the process of the high voltage generator boosting the conductor, the conductor and the high voltage generator as a power source cannot form a circuit loop, resulting in a voltage on the overhead conductor, but no current. When the voltage level rises from 100kV to 1000kV, the air is broken down, the wire segments carry out corona discharge on the air, and thus, a current path is formed, and corona loss is generated.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (15)
1. A system for corona loss measurement of a high voltage ac transmission line, the system comprising:
the high-voltage line voltage measurement module is used for transmitting the measured high-voltage signal to the high-voltage line data acquisition module in real time by using an optical fiber transmission line; wherein, voltage measurement module includes on the high tension line: the device comprises a voltage transformer, a waveform conversion device and a photoelectric conversion transmitter group; the primary coil of the voltage transformer is connected in series with a high-voltage alternating-current circuit, the secondary coil of the voltage transformer is connected in series with a waveform conversion device and a photoelectric conversion transmitter, and the voltage transformer converts a measured high-voltage electric signal into an optical signal through the photoelectric conversion transmitter and transmits the optical signal to a data acquisition module on a high-voltage line; the voltage measuring module on the high-voltage line is positioned in a cylindrical metal material protection barrel, and grading rings are arranged at two ends of the protection barrel;
the resistance sensor is connected in series into the high-voltage alternating-current transmission line, measures a corona current signal and transmits the corona current signal to the data acquisition module on the high-voltage line;
the high-voltage on-line data acquisition module is used for synchronously acquiring the high-voltage signal and the corona current signal in a double-channel synchronous acquisition mode, respectively converting the high-voltage signal and the corona current signal into two optical signals and then transmitting the two optical signals to the high-voltage off-line photoelectric conversion module by using an optical fiber transmission line;
the high-voltage line lower photoelectric conversion module is used for respectively converting the two optical signals into two electric signals through photoelectric conversion and transmitting the two electric signals to an upper computer for processing;
the upper computer receives the two electric signals transmitted by the photoelectric conversion module under the high-voltage wire and calculates the corona loss; and
and the power supply module adopts a storage battery pack for supplying power, so that the system can work normally.
2. The system of claim 1, wherein the on-high line voltage measurement module is mounted at a back end of a high voltage generator.
3. The system of claim 1, wherein the resistive sensor and the on-line data acquisition module are disposed at the same location on the high voltage line, and are both mounted within the protective barrel to reduce the effect of the complex electromagnetic environment generated by the high voltage ac line on the corona current signal.
4. The system of claim 1, wherein the data acquisition module on the high-voltage line comprises: the system comprises a collection card, a photoelectric converter and a control circuit board; the control circuit board is a pivot connected with the data acquisition module device on the high-voltage line and used for controlling the state of the data acquisition module device on the high-voltage line, and the photoelectric converter converts two optical signals transmitted to the data acquisition module on the high-voltage line through an optical fiber transmission line into two electric signals and transmits the two electric signals to the acquisition card.
5. The system according to claim 4, wherein the acquisition card converts the two collected electrical signals into two optical signals through photoelectric conversion, and then down-transmits the two optical signals to the high-voltage line down photoelectric conversion module through the optical fiber transmission line.
6. The system of claim 1, wherein the high-voltage on-line data acquisition module is connected with the high-voltage off-line photoelectric conversion module through the optical fiber transmission line.
7. A method of measuring corona loss of a high voltage ac transmission line, the method comprising:
the power supply module supplies power to the system by adopting a storage battery group, so that the system can work normally;
the high-voltage line voltage measurement module transmits a high-voltage signal obtained by measurement of the voltage transformer to the high-voltage line data acquisition module in real time by using an optical fiber transmission line; wherein, voltage measurement module includes on the high tension line: the device comprises a voltage transformer, a waveform conversion device and a photoelectric conversion transmitter group; the primary coil of the voltage transformer is connected in series with a high-voltage alternating-current circuit, the secondary coil of the voltage transformer is connected in series with a waveform conversion device and a photoelectric conversion transmitter, and the voltage transformer converts a measured high-voltage electric signal into an optical signal through the photoelectric conversion transmitter and transmits the optical signal to a data acquisition module on a high-voltage line;
measuring a corona current signal by using a resistance sensor and transmitting the corona current signal to a data acquisition module on a high-voltage wire;
the high-voltage line data acquisition module is used for synchronously acquiring the high-voltage signal and the corona current signal, respectively converting the high-voltage signal and the corona current signal into two optical signals and then transmitting the two optical signals to the high-voltage line photoelectric conversion module by using an optical fiber transmission line;
the photoelectric conversion module under the high-voltage wire respectively converts the two optical signals into two electric signals through photoelectric conversion and transmits the two electric signals to an upper computer for processing; and
the upper computer receives the two electric signals transmitted by the photoelectric conversion module under the high-voltage line and calculates the corona loss.
8. The method of claim 7, wherein the on-high line voltage measurement module is mounted at a back end of a high voltage generator.
9. The method of claim 7, wherein the high line voltage measurement module is located within a cylindrical protective barrel of metal material and grading rings are mounted at both ends of the protective barrel.
10. The method of claim 7, wherein the resistive sensor is connected in series into the high voltage ac transmission line.
11. The method of claim 7, wherein the data acquisition module on the high-line employs a dual channel synchronous acquisition mode.
12. The method of claim 7, wherein the resistive sensor and the on-line data acquisition module are located at the same location on the high voltage line and are both mounted within the protective barrel to reduce the effect of the complex electromagnetic environment created by the high voltage ac line on the corona current signal.
13. The method of claim 7, wherein the data acquisition module on the high-voltage line comprises: the system comprises a collection card, a photoelectric converter and a control circuit board; the control circuit board is a pivot connected with the data acquisition module device on the high-voltage line and used for controlling the state of the data acquisition module device on the high-voltage line, and the photoelectric converter converts optical signals transmitted to the data acquisition module on the high-voltage line through an optical fiber transmission line into electric signals and transmits the electric signals to the acquisition card.
14. The method according to claim 13, wherein the acquisition card converts the two collected electrical signals into two optical signals through photoelectric conversion, and then down-transmits the two optical signals to the high-voltage line down photoelectric conversion module through the optical fiber transmission line.
15. The method of claim 7, wherein the high-voltage inline data acquisition module is connected with the high-voltage inline photoelectric conversion module through the optical fiber transmission line.
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| CN108646076A (en) * | 2018-04-27 | 2018-10-12 | 国家电网公司 | Double resistance multi-channel type high voltage direct current photoelectricity flow measuring systems and method |
| CN108872676B (en) * | 2018-06-04 | 2019-08-27 | 华北电力大学 | A kind of substation bus bar duplex frequency voltage measuring device |
| CN109166754B (en) * | 2018-10-20 | 2019-12-17 | 华北电力大学 | High-voltage circuit breaker and electric power measurement system comprising same |
| PL3680672T3 (en) * | 2019-01-09 | 2024-04-22 | Microelettrica Scientifica S.P.A. | An improved device for measuring the electric power drawn by a railway vehicle from a high-voltage electric supply line |
| CN111239556B (en) * | 2020-02-03 | 2022-12-06 | 华北电力大学 | Experimental device for detecting corona starting voltage of alternating current-direct current system and measuring method thereof |
| US20220234937A1 (en) | 2021-01-22 | 2022-07-28 | Macleon, LLC | System and method of refining optical fiber |
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