CN106645865B - Device for measuring corona current of high-voltage transmission line - Google Patents
Device for measuring corona current of high-voltage transmission line Download PDFInfo
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- CN106645865B CN106645865B CN201610833629.3A CN201610833629A CN106645865B CN 106645865 B CN106645865 B CN 106645865B CN 201610833629 A CN201610833629 A CN 201610833629A CN 106645865 B CN106645865 B CN 106645865B
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Abstract
The invention discloses a device for measuring corona current of a high-voltage transmission line, which comprises: the device comprises a corona cage, a resistance sensor, an overvoltage protection module, an on-off controller, a photoelectric conversion unit, a data acquisition card and a power supply unit, wherein the resistance sensor is connected in series at the cage side of the corona cage; the resistance sensor is connected with the overvoltage protection module in parallel; the overvoltage protection module is connected with the on-off controller, so that the damage of the corona cage to the data acquisition card due to instantaneous high-voltage discharge can be effectively avoided; the on-off controller and the data acquisition card are connected with the photoelectric conversion unit through data lines and exchange data; the photoelectric conversion unit is used for converting optical signals and electric signals; the power supply unit is electrically connected with the data acquisition card and the photoelectric conversion unit respectively and provides a direct current power supply for the data acquisition card and the photoelectric conversion unit.
Description
Technical Field
The present invention relates to the field of transmission line measurement technologies, and more particularly, to a device, a system, and a method for measuring a corona current of a high-voltage transmission line.
Background
The corona cage is a concentric netted metal cage with square or circular cross section, and the cage body is connected to ground to simulate ground. Because the distance between the wire and the cage is shorter than the distance between the wire and the ground, the lower voltage level is applied to the wire, so that the field intensity on the surface of the wire can reach the surface field intensity level of the actual transmission line with the higher voltage level, and the corona characteristic of the transmission line wire under the high voltage level is shown. The corona cage can be used for researching the corona characteristics of the ultra-high voltage and ultra-high voltage transmission lines, such as corona loss, radio interference, audible noise and the like, corona initial voltage, electric field distribution, ion current density distribution and the like. The influence of the factors on the corona characteristics of the transmission line can be researched by adjusting the experimental conditions, such as changing the splitting number and height of the wire, the polar distance, the surface conditions of the wire, such as dust falling and dirt deposition, the air pressure, the humidity and the temperature, and simulating various environmental factors.
With the improvement of the voltage grade of the Chinese transmission line and the input operation of the ultra-high voltage direct current transmission project, the corona loss of the transmission line and the electromagnetic environment problem caused by corona become more and more prominent. Therefore, the research on the corona characteristic of the power transmission line has important significance for guaranteeing the safe and economic operation of the power transmission line. The corona loss and electromagnetic environment of the high-voltage transmission line are caused by corona discharge of the conducting wire, and the most direct physical quantity for representing the corona discharge is corona current. At present, aiming at the problem of measuring the corona loss/corona current of the high-voltage direct-current transmission line, a bridge circuit method, a coupling antenna method, a power meter method, a sampling resistance sensor and other methods exist in China, but the methods respectively have the problems of inconvenient operation, potential safety hazard, incapability of realizing long-time online measurement in different climates, difficulty in realizing multipoint synchronous measurement and incapability of measuring transient waveform of the corona current.
In addition, the conventional corona current measuring devices for high-voltage transmission lines are located on the ultra/extra-high voltage side, so that a series of problems caused by a high-voltage environment, such as a sensor self-discharge problem in the high-voltage environment, a self-discharge problem of the measuring device and a communication line in the high-voltage environment, a power supply problem in the high-voltage environment, a high-speed measurement and transmission problem of weak current signals in the high-voltage environment, and the like, need to be solved. The wide-frequency-domain corona current measuring system for the extra-high voltage direct current transmission line is successfully developed by combining China institute of electrical science and aerospace university, solves the problems and obtains an international advanced research result. But its shortcoming is that its implementation process is comparatively complicated, and measuring device's price is comparatively expensive, has certain degree of difficulty in technical popularization and application.
Disclosure of Invention
In order to solve the above problems, the present invention provides an apparatus for measuring a corona current of a high voltage transmission line, the apparatus comprising: the device comprises a corona cage, a resistance sensor, an overvoltage protection module, an on-off controller, a photoelectric conversion unit, a data acquisition card and a power supply unit. Preferably, a resistance sensor is connected in series on the cage side of the corona cage to measure the corona current; the resistance sensor is connected with the overvoltage protection module in parallel; the overvoltage protection module is connected with the on-off controller and is used for protecting the data acquisition card when the corona cage generates instantaneous high-voltage discharge; the on-off controller and the data acquisition card are connected with the photoelectric conversion unit through data lines and exchange data; the photoelectric conversion unit is used for converting optical signals and electric signals; the power supply unit is electrically connected with the data acquisition card and the photoelectric conversion unit respectively and provides a direct current power supply for the data acquisition card and the photoelectric conversion unit.
Preferably, the corona cage is a concentric mesh metal cage, and comprises an outer layer mesh and an inner layer mesh; the outer layer net is grounded and used for shielding interference from the outside; the inner layer network is used for measuring the corona effect of the high-voltage transmission line; one end of the resistance sensor is connected with the inner net of the corona cage, and the other end of the resistance sensor is connected with the outer net of the corona cage.
Preferably, an insulating support is arranged between the inner net of the corona cage and the outer net of the corona cage.
Preferably, the inner net of the corona cage comprises a measuring section and protective sections positioned at two sides of the measuring section; the protection section is grounded and used for shielding an end effect caused by the end part of the corona cage, and the measurement section is used for collecting corona effect data of the high-voltage transmission line.
Preferably, the inner layer net of the corona cage is divided into a plurality of sections, and each section is insulated and connected by a metal strip which is convenient to disassemble.
Preferably, the resistance sensor is an adjustable sensor, and the resistance sensor has a plurality of gears.
Preferably, the overvoltage protection module comprises a bidirectional transient voltage suppression diode and a gas discharge tube. The input end of the resistance sensor and the input end of the data acquisition card are connected in parallel with a TVS and a gas discharge tube for input protection.
Preferably, the on-off controller comprises a relay, a relay driving chip, an inverter and a main control chip, the main control chip is connected with the relay to control the on-off of the circuit, and the relay is connected with the inverter through a pin led out from the relay driving chip.
Preferably, the relay driver chip is a high-voltage-withstanding and high-current Darlington array inverter driver, and the relay driver chip is composed of seven NPN silicon Darlington tubes.
Preferably, the photoelectric conversion unit comprises a local end module for converting the USB to the optical fiber and a remote end module for converting the optical fiber to the USB, the remote end module is connected with the data acquisition card, and the local end module is connected with the upper computer.
Preferably, the data acquisition card is clamped in the iron box, and the joint of the USB extender and the probe of the data acquisition card is reinforced by a reinforcing member.
Preferably, the leading-in terminal of the power supply unit is connected in series with a self-recovery fuse.
Preferably, the input end of the power supply unit is connected with mains supply, and the mains supply is converted into a 5V power supply.
Preferably wherein the device is located in a pitched roof construction arrangement.
The invention provides a system for measuring corona current of a high-voltage transmission line, which comprises:
the device measures the corona current of the high-voltage transmission line; and
and the corona current measurement local module receives and processes corona current data transmitted by the optical fiber.
Preferably, wherein the corona current measurement local module is located within the measurement chamber.
The invention provides a method for measuring corona current of a high-voltage transmission line, which comprises the following steps:
connecting a resistance sensor between the corona cage measuring section and the outer layer mesh;
connecting an optical signal output end of the photoelectric conversion unit with a corona current measurement local end through an optical fiber;
carrying out a pressurization test and measuring a corona current;
and transmitting the measured corona current to a corona current measurement local end.
The invention has the beneficial effects that:
1. the invention adopts a corona cage body side measuring technology, the resistance sensor is connected in series at the corona cage body side to measure the corona current of the high-voltage transmission line, and the potential at the resistance sensor is reduced due to the lower voltage at the corona cage body side of the corona cage, so the invention solves the problems in the prior art, has the advantages of small investment, controllable experimental conditions, convenient structure adjustment, convenient measurement, stable operation and short test period, can realize a convenient range selection function, and has an important effect on the research of the corona characteristic of the ultra-high voltage direct current transmission engineering.
2. The invention adopts optical fiber transmission, and the optical fiber transmission has the advantages of wide frequency band, large communication capacity, low loss, electromagnetic interference resistance, no crosstalk interference, good confidentiality and the like.
3. The invention is provided with the on-off controller, can protect the data acquisition card, prevent instantaneous high voltage from entering a measurement system, and simultaneously, can ground the inner wall of the corona cage, prevent accumulated charges and protect the measurement environment.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a schematic structural diagram of a measuring device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a corona cage in a measuring device according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a protection circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of on-off protection according to an embodiment of the present invention;
FIG. 5 is a diagram of an on-off protection circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a remote end of a measurement system according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a fiber optic connection according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a local side of a measurement system according to an embodiment of the invention;
FIG. 9 is a schematic diagram of the overall corona current measurement circuit system according to an embodiment of the invention; and
fig. 10 is a flowchart of a method 1000 for measuring corona current of a high-voltage transmission line according to an embodiment of the invention.
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 is a schematic structural diagram of a measurement apparatus according to an embodiment of the present invention. As shown in fig. 1, the apparatus includes: the device comprises a corona cage, a resistance sensor, an overvoltage protection module, an on-off controller, a photoelectric conversion unit, a data acquisition card and a power supply unit.
Preferably, wherein the cage side series connection sensor of corona cage is in order to measure corona current, resistance sensor and overvoltage protection module are parallelly connected, on-off controller is connected to the overvoltage protection module for protect data collection card when corona cage produces instantaneous high voltage discharge, on-off controller connects data collection card, and on-off control can protect data collection card, avoids the instantaneous high voltage to get into measurement system, and on-off controller intercommunication is equivalent to measuring the cage direct ground connection with the corona when data collection card is inoperative at ordinary times, just breaks off on-off controller when only measuring, and at this moment corona current signal gets into measurement system. The on-off controller can also ground the inner wall of the corona cage, so that the accumulated charges are avoided, and the measuring environment is protected; the on-off controller and the data acquisition card are connected with the photoelectric conversion unit through data lines and exchange data; the photoelectric conversion unit comprises a USB-to-optical fiber local end module and an optical fiber-to-USB remote end module, and is used for converting optical signals and electric signals; the power supply unit is electrically connected with the data acquisition card and the photoelectric conversion unit respectively and provides a direct current power supply for the data acquisition card and the photoelectric conversion unit.
The invention skillfully utilizes the corona cage to measure the corona current on the low-voltage side, and effectively protects the measuring device, thereby overcoming the problems of inconvenient operation, potential safety hazard, incapability of realizing long-time online measurement in different climates, difficulty in realizing multipoint synchronous measurement, incapability of measuring transient waveform of the corona current and the like of the conventional system.
Fig. 2 is a schematic structural diagram of a corona cage in a measuring device according to an embodiment of the invention. As shown in fig. 2, the black line is a conducting wire, 1 is a measuring section, 2 is an inner layer net, 3 is an insulating support, 4 is an outer layer net, and 5 is a protective section. Preferably, the corona cage is a concentric net-shaped metal cage, and comprises an outer net 4 and an inner net 2; wherein the outer layer net 4 is grounded and used for shielding the interference from the outside; the inner layer net 2 is used for measuring the corona effect of the high-voltage transmission line; one end of the resistance sensor is connected with the corona cage inner layer net 2, and the other end of the resistance sensor is connected with the corona cage outer layer net 4. Preferably, an insulating support 3 is arranged between the inner layer net 2 of the corona cage and the outer layer net 4 of the corona cage. Preferably, the inner net 2 of the corona cage comprises a measuring section 1 and protective sections 5 positioned at two sides of the measuring section; the protection section 5 is grounded and used for shielding end effect caused by the end part of the corona cage, the measurement section 1 is used for collecting corona effect data of the high-voltage transmission line, and the length of the measurement section 1 is at least 3 times of the length of the protection section 3. Preferably, the inner layer net 2 of the corona cage is divided into a plurality of sections, and each section is insulated and connected by a metal strip which is convenient to disassemble. The lengths of the measuring section 1 and the guard section 5 may be changed as required.
Preferably, wherein resistance sensor is adjustable sensor, has a plurality of gears, can enough artifical the gear shifting, can realize automatic gear shifting through the procedure again, resistance sensor's one end is connected the measurement section of corona cage inlayer net, and another termination corona cage outer net.
The sampling resistor occupies an extremely important position in a measuring system, an extra-high voltage corona cage direct current lead is required to be connected in series to measure a corresponding current value, factors such as high voltage breakdown prevention, heat dissipation, electromagnetic interference resistance, no inductance effect and the like are considered, and a precise resistance type sensor is adopted. After long-term extra-high voltage corona current tests, the resistance impedance characteristics of 50 omega, 100 omega and 150 omega are stable, and the measurement requirements of the corona current in a wide frequency domain can be met, so that a multi-resistance adjustable sensor is adopted.
Preferably, the overvoltage protection module comprises a bidirectional transient voltage suppression diode (TVS) and a gas discharge tube, the bidirectional transient voltage suppression diode (TVS) and the gas discharge tube are connected in parallel to the input end of the resistance sensor and the input end of the data acquisition card for input protection, so that damage to the data acquisition card by transient high-voltage discharge generated by the corona cage can be avoided, and under the impact of transient high power, the TVS can change its impedance at a very high speed, so as to absorb a very large current, clamp the voltage at its two ends to a predetermined value, and meet the requirement of ns-level rapid protection in the system.
When the corona current is measured, the voltage grade of the power supply chamber can be increased to 1000kV at most. Operating at this voltage level, the acquisition card may be subject to the risk of transient high voltage pulses breaking down its acquisition channel. Particularly, when the power supply chamber is subjected to voltage reduction and grounding, high-voltage pulses directly flow into the ground through the acquisition card channel, so that the probe of the acquisition card is extremely easy to damage.
Fig. 3 is a schematic structural diagram of a protection circuit according to an embodiment of the invention. As shown in fig. 3, the limiting circuit is added at two ends of the non-inductive resistor, and the limiting circuit comprises a short-circuit switch, a TVS tube and a discharge tube, and is connected in parallel with the non-inductive resistor, so as to clamp the channel voltage of the data acquisition card at a lower voltage level. When the power supply chamber is grounded in a voltage reduction mode, the short-circuit switch is closed, and high-voltage pulses directly flow into the ground, so that the high-voltage pulses can be prevented from puncturing a channel of the acquisition card.
In specific implementation, the TVS tube may be a P6KE15CA transient suppression diode, and the discharge tube may be a 2R-75V ceramic discharge diode.
Preferably, the on-off controller comprises a relay, a relay driving chip, an inverter and a main control chip, the main control chip is connected with the relay to control the on-off of the circuit, and the relay is connected with the inverter through a pin led out from the relay driving chip. The data acquisition card is out of work and sets the magnetic latching relay, when the data acquisition card works, the magnetic latching relay is reset, and the first-level phase inverter is added, so that a single-chip microcomputer signal applied to the relay after power-on is in a high level, namely, a set signal and a reset signal are invalid, and misoperation of the relay is avoided.
Each pair of Darlington of the relay driving chips is connected with a 2.7k base resistor in series, can be directly connected with TT L and a CMOS circuit under the working voltage of 5V, has high working voltage and high working current, can bear the voltage of 50V when in a closed state, and can output the voltage and operate in parallel under the high load current.
FIG. 4 is a schematic diagram of on-off protection according to an embodiment of the present invention. As shown in fig. 4, when the data acquisition card does not work, the relay (or called magnetic latching relay) in the on-off controller is set, the measuring resistor in the precision resistance sensor is short-circuited, the corona current directly flows into the ground, and the input end of the acquisition device is zero. When the data acquisition card works, the magnetic latching relay is reset, the measuring resistor is connected between the corona current test wire and the ground wire in series, and the corona current enters the data acquisition card. The on-off controller has two functions, namely, the measurement system is protected, instantaneous high voltage is prevented from entering the data acquisition card, the on-off controller is communicated when the data acquisition card does not work at ordinary times, namely, the corona measurement cage is directly grounded, the on-off controller is disconnected only when measurement is carried out, and then a corona current signal enters the data acquisition card. In addition, in the step-down grounding stage, because the voltage is instantly reduced to 0V, a large current flows through the test line segment, and at this time, if the measuring end is not grounded, the data acquisition card is damaged. And secondly, the inner wall of the corona cage is grounded, so that accumulated charges are avoided, and the measurement environment is protected.
Fig. 5 is a diagram of an on-off protection circuit according to an embodiment of the present invention, as shown in fig. 5, the present invention designs the on-off protection circuit through a magnetic latching relay, MC1413B is a driving chip of the relay, 74HC04 is an inverter, MC1413B is a high withstand voltage, large current darlington array inverter, and the relay driving chip MC1413B is composed of seven NPN silicon darlington transistors, MC1413B is a driving chip in which each pair of darlingtons is connected in series with a 2.7k base resistor, and can be directly connected to TT L and a CMOS circuit at a 5V operating voltage, and led out to each pin in the diagram, and can directly process data that needs a standard logic buffer to process originally, MC1413B is high in operating voltage, and large in operating current, and a sink current up to 500mA, and can withstand a 50V voltage in a closed state, output a high load current, and can be operated in parallel at a high level, and MC1413B is a drain driving, and after a reverse direction, the low load current and the low set signal and the high level reset signal of the relay are added to the single-stage relay, so as an invalid signal, and a reset signal of the relay is added to avoid a single-stage relay, and a reset relay, and a single-chip microcomputer 04, and.
Preferably, the photoelectric conversion unit comprises a local end module for converting the USB to the optical fiber and a remote end module for converting the optical fiber to the USB, the remote end module is connected with the data acquisition card, and the local end module is connected with the upper computer.
FIG. 6 is a schematic diagram of a remote end of a measurement system according to an embodiment of the invention. The remote end module of the measuring system comprises a resistance sensor, a protection circuit (comprising front end protection and acquisition card input end protection), a photoelectric conversion module (remote end), a data acquisition card (for example: DSO-5200A in figure 6) and a power supply unit (for example: power supply module in figure 6).
Fig. 7 is a schematic diagram of a fiber optic connection according to an embodiment of the present invention. The fiber path of the entire measurement system includes the fiber USB extender, the outdoor fiber and the fiber optic adapter box, as shown in fig. 7. The optical fiber USB extender converts the digital differential signal output by the USB data acquisition card into a digital optical signal suitable for remote transmission through an internal photoelectric conversion module. The inside optical fiber distribution cabinet that has of near corona cage low pressure side's outdoor switch board, the outdoor optic fibre of burying in the ground is fixed in optical fiber distribution cabinet after the butt fusion, provides optical fiber connection's flange interface, and one end links to each other with indoor optic fibre, and the other end is connected with long-range end optic fibre USB extender output. The optical fiber distribution cabinet can ensure that the optical fiber is not easy to break, and can prevent the optical fiber from being polluted or corroded in severe weather environment. The optical fiber has wide frequency band, the communication capacity is large, the available bandwidth of the optical fiber is about 50000GHz, and various broadband information can be transmitted; the loss is low, the loss of the current practical quartz optical fiber can be lower than 0.2dB/km, the communication cost can be reduced, and the reliability and the stability are improved; can resist electromagnetic interference. The optical fiber is an insulator material and is not interfered by the lightning interference, the change of an ionized layer, high-voltage equipment and other industrial electrical appliances in the nature. No crosstalk interference and good security. Light waves are transmitted in optical cables and are difficult to leak out of the optical fibers. In order to ensure the stability and reliability of optical fiber communication, the optical fiber flange should be cleaned regularly, and generally, industrial alcohol with a concentration of 75% is selected to be aligned with the optical fiber head or the flange opening for flushing. There are two criteria for rinsing clean: a simple and convenient method is that a red laser pen is used for directly irradiating one end of an optical fiber, a light spot at the other end is observed by naked eyes, the stronger the brightness is, the smaller the optical fiber attenuation is, and the higher the quality of optical fiber communication is; in another method, a precision instrument optical fiber tester can be used for testing the optical fiber, and the attenuation value of optical fiber communication can be directly tested.
Preferably, the data acquisition card is arranged in the iron box, so as to strengthen electromagnetic shielding and reduce radio interference of external environment to the measuring device; the connection position of the optical fiber USB extender and the probe of the data acquisition card is reinforced by a reinforcing member, so that the phenomenon that communication between a remote end and a local end is interrupted due to poor contact of a connecting wire caused by vibration of a nearby pipeline when the corona cage is used for manually simulating rainfall spray is avoided.
Preferably, the leading-in terminal of the power supply unit is connected in series with a self-recovery fuse. Preferably, the input end of the power supply unit is connected with mains supply, and the mains supply is converted into a 5V power supply.
Figure 8 is a local end schematic diagram of a corona current measurement system according to an embodiment of the invention. As shown in fig. 8, 220V outdoor power distribution cabinets are installed on two sides of the corona cage, a plurality of jacks are reserved in the built-in patch board, and an external power line can supply power to local-end equipment. In order to prevent the power line from being exposed in the field for a long time and being easy to age, the corrugated pipe is sleeved on the outer part. The corona current measurement system local end measurement device comprises a power adapter, can convert commercial power into 5V direct current voltage, and simultaneously supplies power for the data acquisition card and the optical fiber USB extender, thereby ensuring that the measurement system works continuously for 24 hours all day long. In order to prevent the overlarge system current caused by improper connection and the like and further burn out the measuring system, a self-recovery fuse is connected in series with the leading-in end of the power supply.
As shown in fig. 8, two switches are used at the local end to control two sets of measurement systems, one of which is a main switch, so long as it is closed, the positive measurement system at the low-voltage side of the corona cage is connected, and the computer can set the device number of the HS3 acquisition card to 0 through the acquisition software. Then, after the branch switch is closed, the corona cage low-voltage side negative electrode measurement system is communicated, and the corresponding HS3 acquisition card equipment number is set to be 1. The computer is connected with the two measuring systems, and different HS3 acquisition cards can be distinguished according to the equipment numbers 0 and 1, so that the corona current acquisition of the two measuring systems is controlled by one computer.
Fig. 9 is a schematic structural diagram of an entire corona current measurement circuit system according to an embodiment of the invention. As shown in fig. 9, the whole measuring circuit of the device for measuring the corona current of the high-voltage transmission line through the corona cage of the invention further comprises a direct-current high-voltage power supply, an anchor tower and a control room. The local end of the corona current measuring system is positioned in the control room and is connected with a PC (personal computer) of the control room through a USB (universal serial bus). Two ends of the corona cage are respectively provided with an anchor tower, and the direct-current high-voltage power supply passes through the anchor tower on the low-voltage side and penetrates through the corona cage. The optical fiber USB extender in the corona current measurement local module is connected with the outdoor optical fiber and can receive the data signal transmitted by the remote end. In order to realize the synchronous measurement of the positive electrode and the negative electrode, the positive electrode optical fiber USB extender and the negative electrode optical fiber USB extender are arranged in the same local end measuring box. The measuring box outputs two USB extenders, and after being connected with a computer, the measuring box can simultaneously measure corona current under positive and negative voltage levels. A switching power supply is adopted to supply power to the two photoelectric conversion modules, 220V is input, and two paths of +5V direct-current power supplies can be output. In order to prevent the danger of accidental short circuit of the equipment, the input end of the switching power supply module is connected with a fuse in series. The computer's identification of the HS3 acquisition card is determined by the sequence in which it is connected to the computer, which is determined by the driver of the HS3 acquisition card. Therefore, the power-on sequence of the HS3 acquisition card can be controlled to determine the physical address. As shown in fig. 9, the device a is a cage-side corona current measuring device, and includes a resistance sensor, an overvoltage protection module, an on-off controller, a photoelectric conversion unit, a data acquisition card, and a power supply unit. The device A transmits the measured corona current to a corona current measurement local end in a control room through an outdoor optical fiber, and the corona current measurement local end transmits a data signal to display equipment through USB communication. When the device A is used, the resistance sensor of the device A is connected to a corona cage measuring section in the whole measuring loop, the optical signal output end of the photoelectric conversion unit is connected with the corona current measuring local end through the optical fiber, the highest voltage grade which can be provided by the direct-current high-voltage power supply is +/-1200 kV, and when a pressurization test is carried out, the voltage grade is generally between 400kV and 1000 kV. The direct-current high-voltage power supply transmits electric energy to the anchor tower through the tubular bus. At the wire hanging disc of the two anchor towers, a multi-split wire for researching the corona characteristic is hung and passes through the corona cage at the 1/2 height. The resistance sensor of the corona current measuring device is connected between the inner layer net and the outer layer net of the corona cage, and the other end of the corona current measuring sensor is grounded because the outer layer net is directly grounded. The whole measurement system utilizes the advantages of optical fiber communication such as anti-interference, strong isolation, fast transmission, low loss and the like to safely transmit the corona current signal to the local end from the remote end, so that the remote operation of testing personnel is realized, the whole high-voltage test loop is isolated from the measurement control equipment, and the high safety of the equipment and the personnel is ensured. Finally, local testing personnel can realize remote monitoring of corona current measurement through upper computer software. Preferably wherein the device is located in a pitched roof construction unit to facilitate rain protection.
Fig. 10 is a flowchart of a method 1000 for measuring corona current of a high-voltage transmission line according to an embodiment of the invention. As shown in fig. 10, the corona current measurement method 1000 begins at step 1001 with the attachment of a resistance sensor between the corona cage measurement section and the outer screen at step 1001. Preferably, the optical signal output of the photoelectric conversion unit is connected with the corona current measurement local terminal through an optical fiber in step 1002. Preferably, at step 1003, a pressurization test is performed and a measurement of the corona current is made. Preferably, the measured corona current is transmitted to a corona current measurement local terminal in step 1004, and the measurement of the corona current of the high-voltage transmission line is completed.
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 (16)
1. An apparatus for measuring corona current of a high voltage transmission line, the apparatus comprising: a corona cage, a resistance sensor, an overvoltage protection module, an on-off controller, a photoelectric conversion unit, a data acquisition card and a power supply unit,
a resistance sensor is connected in series on the side of the corona cage body to measure the corona current; the resistance sensor is connected with the overvoltage protection module in parallel; the overvoltage protection module is connected with the on-off controller and is used for protecting the data acquisition card when the corona cage generates instantaneous high-voltage discharge; the on-off controller and the data acquisition card are connected with the photoelectric conversion unit through data lines and exchange data; the photoelectric conversion unit is used for converting optical signals and electric signals; the power supply unit is respectively and electrically connected with the data acquisition card and the photoelectric conversion unit and provides a direct current power supply for the data acquisition card and the photoelectric conversion unit;
the on-off controller comprises a relay, a relay driving chip, a phase inverter and a main control chip, wherein the main control chip is connected with the relay to control the on-off of the circuit, and the relay is connected with the phase inverter through a pin led out from the relay driving chip.
2. The device of claim 1, wherein the corona cage is a concentric mesh metal cage comprising an outer mesh and an inner mesh; the outer layer net is grounded and used for shielding interference from the outside; the inner layer network is used for measuring the corona effect of the high-voltage transmission line; one end of the resistance sensor is connected with the inner net of the corona cage, and the other end of the resistance sensor is connected with the outer net of the corona cage.
3. The device of claim 2, wherein an insulating support is disposed between the inner mesh of the corona cage and the outer mesh of the corona cage.
4. The device of claim 2, wherein the inner mesh of the corona cage comprises a measuring section and guard sections on either side of the measuring section; the protection section is grounded and used for shielding an end effect caused by the end part of the corona cage, and the measurement section is used for collecting corona effect data of the high-voltage transmission line.
5. The apparatus of claim 2, wherein the inner mesh of the corona cage is divided into a plurality of segments, each segment being insulated and connected by a metal strip that facilitates disassembly.
6. The device of claim 1, wherein the resistive sensor is an adjustable sensor having a plurality of gears.
7. The apparatus of claim 1, wherein said overvoltage protection module comprises a bi-directional transient voltage suppression diode and a gas discharge tube, and the bi-directional transient voltage suppression diode TVS and the gas discharge tube are connected in parallel at the input of the resistive sensor and the input of the data acquisition card for input protection.
8. The apparatus of claim 1, wherein the relay driver chip is a high voltage tolerant, high current darlington array inverter driver, and wherein the relay driver chip is comprised of seven NPN silicon darlington transistors.
9. The device of claim 1, wherein the photoelectric conversion unit comprises a local end module of USB-to-optical fiber and a remote end module of optical fiber-to-USB, the remote end module is connected with the data acquisition card, and the local end module is connected with the upper computer.
10. The device of claim 1, wherein the data acquisition card is housed in a metal case, and the connection between the USB extender and the probe of the data acquisition card is reinforced with a reinforcement member.
11. The apparatus of claim 1, wherein the power supply of the power supply unit has a lead-in connected in series with a self-healing fuse.
12. The device of claim 1, wherein the input end of the power supply unit is connected with a mains supply and converts the mains supply into a 5V power supply.
13. The apparatus of claim 1, wherein the apparatus is located in a pitched roof construction apparatus.
14. A system for measuring corona current of a high voltage power transmission line, the system comprising:
the device of any one of claims 1 to 13, measuring a high voltage transmission line corona current; and a local module for measuring corona current, which receives and processes the data of corona current transmitted by optical fiber.
15. The system of claim 14, wherein the corona current measurement local module is located within a control room.
16. A method for measuring a corona current of a high voltage transmission line using the apparatus according to any one of claims 1 to 13, wherein the method comprises:
step 1, connecting a resistance sensor between a corona cage measuring section and an outer layer net;
step 2, connecting an optical signal output end of the photoelectric conversion unit with a corona current measurement local end through an optical fiber;
step 3, carrying out a pressurization test and measuring the corona current;
and 4, transmitting the measured corona current to a corona current measurement local end.
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| CN109712385A (en) * | 2019-01-21 | 2019-05-03 | 武汉理工大学 | It is a kind of for completely cutting off the data acquisition device of high pressure |
| CN111458543A (en) * | 2020-04-17 | 2020-07-28 | 华北电力大学（保定） | PCB board level test combined wave generator controlled by mercury switch |
| CN111564826B (en) * | 2020-05-12 | 2022-06-28 | 中国科学院上海光学精密机械研究所 | Dual protection circuit for atomic chip |
| CN112684240B (en) * | 2021-03-12 | 2021-10-22 | 北京妙微科技有限公司 | High-precision electric power Internet of things corona current measuring device |
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