CN108303571B - High potential current collection system with rain-proof function - Google Patents
High potential current collection system with rain-proof function Download PDFInfo
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- CN108303571B CN108303571B CN201711311433.9A CN201711311433A CN108303571B CN 108303571 B CN108303571 B CN 108303571B CN 201711311433 A CN201711311433 A CN 201711311433A CN 108303571 B CN108303571 B CN 108303571B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
- G01R15/06—Voltage dividers having reactive components, e.g. capacitive transformer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
- G08C23/06—Non-electrical signal transmission systems, e.g. optical systems through light guides, e.g. optical fibres
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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Abstract
The utility model provides a high potential current collection system with rain-proof function, includes data acquisition box, data receiving arrangement and trigger device, the data acquisition box includes the shielded cell and installs data acquisition box and the adjustable resistor in the shielded cell, the shielded cell connects the high voltage conductor and hangs on the cross arm through the insulator, the one end and the shielded cell electricity of adjustable resistor are connected, and the other end is connected with the discharge electrode electricity of shielded cell below through the outside electrically conductive copper bar that is equipped with the insulating layer, and the control line and the voltage measurement cable of adjustable resistor are connected with the data acquisition box, the data acquisition box passes through optic fibre and data receiving arrangement and trigger device exchange information. The data acquisition part at the high-voltage side is placed in the metal shielding box, and the information transmission at the high-voltage side and the low-voltage side is realized through the optical fiber, so that various electromagnetic interferences can be shielded, the electrical insulation between the high-voltage side and the low-voltage side is ensured, the optical fiber is suitable for being used under the rain condition, and favorable conditions are created for the research of air gap discharge under the rain condition.
Description
Technical Field
The invention relates to a high-potential current acquisition system capable of being used under the conditions of rain and strong interference, and belongs to the technical field of measurement.
Background
In the ultra-high voltage/ultra-high voltage transmission line, air is the most common insulating medium, and insulation flashover and breakdown faults are one of the most important hazards in a power transmission system. The extra-high voltage line greatly improves the voltage grade of the line, the insulation requirement of line equipment is greatly improved due to the improvement of the voltage grade, and the research on the long air gap discharge is more important. A large number of experimental researches are carried out on the breakdown process of the air gap under the dry condition by scholars at home and abroad, and the results show that the breakdown voltage shows a 'saturation' trend along with the increase of the gap length. However, studies by scholars on the discharge process of a long air gap under rainfall conditions are limited, and extensive consensus cannot be achieved.
In recent years, air pollution in local areas of China is more and more serious, the conductivity of rainwater is continuously increased and can reach 2000 mu S/cm sometimes, and the conductivity of the rainwater is remarkably enhanced. Under extreme rainstorm conditions, the instantaneous rainfall intensity can even exceed 10mm/min, and the insulation capability of the line faces severe test. From the operation condition of the traditional high-voltage transmission line, a wire flashover accident can occur under rainfall, particularly under a rainstorm condition, and the hardware part is easy to flashover due to high field intensity. Therefore, the method has great engineering significance for researching air gap discharge in a rain state, and measuring the discharge current is an effective method for researching air gap discharge.
The high-voltage discharge current measuring methods widely adopted at present mainly comprise two types: one is a mode of serially connecting Rogowski coils at the high-voltage electrode side; and the other is that a sampling resistor is connected in series between the low-voltage electrode and the ground wire, and the discharge current is calculated by measuring the voltage at the two ends of the resistor. However, as the research goes deeper, the students find that both the two measurement methods have a plurality of disadvantages. The measurement result of the rogowski coil is greatly affected by its frequency response characteristic, especially when the measurement current has a direct current component. When the measuring mode of serially connecting a resistor at the low-voltage end is used, only when the grounding flat plate is large enough, positive ions generated by space ionization can be ensured to completely enter the grounding flat plate. Meanwhile, the gap distance is large, and the migration speed of positive ions is slow, so that the current measured at the grounding flat plate cannot reflect the physical discharge process in real time. In view of the above, in recent years, it is common to measure the pre-discharge current by connecting a sampling resistor in series to the high-voltage side. The pre-discharge current usually appears in a pulse form, and the waveform rise time is short, so that the measurement system is required to have a larger analog bandwidth; the high-voltage part of the measuring equipment is connected into a discharge circuit, the potential is very high, and good electrical insulation is required to be provided so as to ensure the electrical safety of the low-voltage sampling equipment; the measurement of the pre-discharge current is performed in a high-voltage environment, belongs to the time domain measurement of a fast transient signal, and requires a certain anti-electromagnetic interference capability of a measurement system.
The existing high-voltage side pre-discharge current measuring device obtains a good measuring effect in a long-gap discharge experiment, but has some problems, such as short continuous working time of a power supply, large volume, inconvenience in disassembly and charging, incapability of performing remote intelligent control on equipment, high manufacturing cost and single triggering mode. In addition, because the research on the long-gap discharge experiment under the rain condition is less, the existing measuring device is not designed with the rain-proof problem taken into consideration, and therefore, the improvement is needed.
Disclosure of Invention
The invention aims to provide a high-potential current acquisition system with a rainproof function aiming at the defects of the prior art, and creates favorable conditions for the research of air gap discharge in a rainy state.
The problems of the invention are solved by the following technical scheme:
a high-potential current acquisition system with a rainproof function comprises a data acquisition box, a data receiving device and a trigger device, wherein the data acquisition box comprises a shielding box, a data acquisition box and an adjustable resistor, the data acquisition box and the adjustable resistor are installed in the shielding box, the shielding box is connected with a high-voltage wire and hung on a cross arm through an insulator, one end of the adjustable resistor is electrically connected with the shielding box through a resistor shielding cover covering the outer part of the adjustable resistor, the other end of the adjustable resistor is electrically connected with a discharge electrode below the shielding box through a conductive copper bar with an insulating layer arranged outside, a resistance control line and a voltage measuring cable of the adjustable resistor are connected with the data acquisition box, and the data acquisition box exchanges information with the data receiving device and the trigger device through optical fibers.
Above-mentioned high potential current collection system with rain-proof function, the part that electrically conductive copper bar is located outside the shielded cell is equipped with rain-proof cover.
The high potential current collection system with rain-proof function, adjustable resistance is including installing a plurality of sampling resistance on the PCB circuit board and with every sampling resistance corresponding electric control switch and TVS stabilivolt, a plurality of sampling resistance series connection back connect between resistance shield cover and conductive copper bar and be connected with the data acquisition box through the voltage measuring cable, every electric control switch's normally open contact and every TVS stabilivolt connect in parallel on the sampling resistance that corresponds, electric control switch's on-off controller passes through the resistance control line and is connected with the data acquisition box, still be equipped with discharge tube on the PCB circuit board, discharge tube connects between resistance shield cover and conductive copper bar.
The high potential current collection system with rain-proof function, the inside of shielded cell is divided into upper, middle and lower three chamber by metal partition, data acquisition box is fixed at last intracavity, adjustable resistance and outside resistance shield cover are located the middle intracavity, and the electrically conductive copper bar that the outside was equipped with the insulating layer passes the indent bottom plate of shielded cell and the centre bore and the discharge electrode and the adjustable resistance connection of baffle down.
According to the high-potential current acquisition system with the rainproof function, the side wall of the shielding box is cylindrical and is divided into three sections along the vertical axis of the shielding box, the adjacent two sections are connected through the external thread at the upper end of the lower section and the internal thread at the lower end of the upper section, and the periphery of the lower end of the shielding box is coated with the hydrophobic material.
The high-potential current acquisition system with the rainproof function is characterized in that the trigger device comprises a trigger source and a photoelectric conversion device, and a trigger signal generated by the trigger source is converted into an optical signal by the photoelectric conversion device and then is transmitted to the data acquisition box through the optical fiber.
According to the high-potential current collecting system with the rainproof function, the position, close to the data receiving device and the photoelectric conversion device, of the optical fiber is hung high through the rainproof tower.
The high potential current collection system with the rain-proof function further comprises a solar cell panel in the structure, the solar cell panel is fixed on the cross arm and charges a storage battery in the data collection box through a charging wire, and the charging wire is fixed on a remote control telescopic arm on the solar cell panel.
The high-potential current acquisition system with the rainproof function is characterized in that the trigger source comprises a capacitive voltage divider, a decay circuit and a voltage comparator, one end of the capacitive voltage divider is grounded, the other end of the capacitive voltage divider is connected with an impulse voltage generator, a voltage signal output by the capacitive voltage divider is processed by the decay circuit and then is sent to the non-inverting input end of the voltage comparator, the inverting input end of the voltage comparator is connected with reference voltage, and the output end of the voltage comparator is connected with the input end of the photoelectric conversion device.
The above-mentioned high potential current collection system with rain-proof function, the trigger source includes light probe, photomultiplier and voltage comparator, light probe receives the light signal that high-pressure discharge produced, photomultiplier's light signal input end connects light probe, and current signal output part is through signal conversion resistance ground connection, and the voltage signal of signal conversion resistance output connects the homophase input of voltage comparator, the inverting input termination reference voltage of voltage comparator, the input of output connection photoelectric conversion device.
The above-mentioned high potential current collection system with rain-proof function, the trigger source includes magnetic induction coil and voltage comparator, magnetic induction coil arranges the below of discharge electrode in, and the voltage signal of magnetic induction coil output connects the input of voltage comparator, the output of voltage comparator connects photoelectric conversion device's input.
The data acquisition part at the high-voltage side is placed in the metal shielding box, and the information transmission at the high-voltage side and the low-voltage side is realized through the optical fiber, so that various electromagnetic interferences can be shielded, the electrical insulation between the high-voltage side and the low-voltage side is ensured, the optical fiber is suitable for being used under the rain condition, and favorable conditions are created for the research of air gap discharge under the rain condition. In addition, the invention has the advantages of simple structure, small volume, large measurement bandwidth, high measurement precision, wide application range and the like, and can be applied to various high-voltage test occasions.
Drawings
FIG. 1 is a schematic view of the general structure of a high potential current measuring device;
FIG. 2 is a schematic diagram of a data collection box configuration;
FIG. 3 is a schematic diagram of an adjustable resistor configuration;
FIG. 4 is a schematic diagram of a voltage comparator type trigger source;
FIG. 5 is a schematic diagram of an optical signal triggered trigger source;
FIG. 6 is a schematic diagram of a magnetic induction trigger-type trigger source;
FIG. 7 is a schematic view of a charging system state of charge;
fig. 8 is a schematic diagram of the state of the charging system during the experiment.
The list of labels in the figure is: 1. solar cell panel, 2, cross arm, 3, insulator, 4, data acquisition box, 5, optical fiber, 5-1, data optical fiber, 5-2, trigger optical fiber, 6, data receiving device, 7, photoelectric conversion device, 8, rain-proof tower, 9, trigger source, 10, discharge electrode, 11, rain-proof cover, 12, high-voltage lead, 13, shielding box, 14, data acquisition box, 15, voltage measurement cable, 16, conductive copper bar, 17, insulating layer, 18, adjustable resistor, 19, resistance shielding cover, 20, resistance control line, 21, discharge tube, 22, TVS voltage regulator, 23, electric control switch, 24, sampling resistor, 25, PCB circuit board, 26, switch controller, 27, capacitance voltage divider, 28, decay circuit, 29, voltage comparator, 30, telescopic arm, 31, charging wire, 32, photoelectric multiplier, 33, optical probe, 34, photoelectric multiplier, and photoelectric converter, Magnetic induction coil, R0A signal conversion resistor, R+In-phase input resistor, R-And an inverting input resistor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention provides a high-potential current acquisition system which can be used under a rain condition and can be used under high-voltage and strong-interference electromagnetic conditions and rain experiment conditions. In the invention, the sampling resistor converts the current signal of the discharge channel into a voltage signal, and the voltage data acquired by the data acquisition card in the data acquisition box is converted into an optical signal and then is output outwards through the optical fiber. On the low-voltage side, a receiving end of a photoelectric conversion module in the data receiving device receives the optical signal, converts the optical signal into an electric signal and transmits the electric signal to a computer. And triggering the data acquisition card to work by using a trigger signal generated by the trigger circuit. Different triggering modes can be selected according to different experimental conditions and measurement current characteristics. The trigger signal is converted and transmitted by the photoelectric conversion device and is accessed to an external trigger input interface of the data acquisition card. The high-voltage end and the low-voltage end of the whole system are connected only by the optical fiber, so that the attenuation of data in the transmission process is reduced, and good electrical insulation is provided between the high-voltage end and the low-voltage end. The sampling resistor used by the invention is a precise shunt and a high-frequency non-inductive resistor, the sampling resistor is fixed on the PCB, and the sampling resistance value can be conveniently changed on the low-voltage side according to the requirement through the logic circuit. The high-voltage side data acquisition part is arranged in the metal shielding cavity, and through a specific structural design, stray capacitance is greatly reduced, and the fact that the internal equipment of the cavity is not damaged due to water inflow under the rain condition is also guaranteed. The invention has the advantages of simple structure, small volume, large measurement bandwidth, high measurement precision, strong anti-interference capability and wide application range, and can be applied to various high-voltage test occasions.
Integral structure of high potential current collection system
Referring to fig. 1, the high-potential current collection system is composed of a data collection box 4 on the high-voltage side, a data receiving device 6 on the low-voltage side, a trigger device and an optical fiber 5 (comprising a data optical fiber 5-1 and a trigger optical fiber 5-2) connecting the high-voltage side and the low-voltage side.
The data acquisition box 4 at the high-voltage side is hung on the cross arm 2 through the insulator 3, the test high voltage is connected through a high-voltage wire 12, and a conductive copper bar 16 extends below the test high voltage and is connected with the discharge electrode 10. The outer surface of the data acquisition box 4 is coated with a hydrophobic material, and the lower conductive copper strip 16 is sleeved with a rainproof cover, so that the influence of rainwater on the insulation between the conductive copper strip 16 and the shielding box is avoided. The data receiving device 6 and the triggering device are located on the ground of the low-voltage end. The high-voltage side and the low-voltage side are connected through the optical fiber 5, the optical fiber 5 is hung high by the rainproof tower 8 after penetrating through a rain area, and the rainwater is prevented from flowing to the low-voltage side along the optical fiber 5, so that the equipment and personal safety is endangered. The use of optical fibers for data transmission both avoids interference from strong electromagnetic fields and provides sufficient electrical insulation. The low-voltage side portion is mainly provided with a data receiving means 6 and a triggering means. The data receiving means 6 are used to receive, convert and process the measurement data. The trigger source is located near the discharge electrode 10, and different types can be selected according to different experimental conditions, and a trigger signal is generated after the set conditions are met. The photoelectric conversion device 7 in the trigger device is used for performing photoelectric conversion on the trigger signal, so that the trigger signal can be transmitted by using an optical fiber. Solar cell panel 1 is fixed in cross arm 2 top, is charged by the battery of operating personnel connection data acquisition box 4 in after the experiment.
Working principle of high-potential current acquisition system
After the whole system is installed according to the figure 1, the photoelectric conversion device at the low-voltage end is electrified, the sampling resistance value is adjusted according to the test condition, a proper trigger mode is selected, and the trigger condition is set. The pressurization test was started after the preparation work was completed.
During the test, the sampling resistor on the high-voltage side converts the current signal flowing through the circuit into a voltage signal. When the trigger condition is met, the trigger device acts to generate a high-level signal. The high-level signal is transmitted to the photoelectric conversion device 7 by the coaxial cable at the low-voltage side, converted into an optical signal, and then transmitted to the data acquisition box 4 at the high-voltage side by the optical fiber. The photoelectric conversion module at the receiving end in the data acquisition box 4 converts the optical signal into an electric signal, and the electric signal is input into the data acquisition card through the D-sub 9 pin external trigger interface. After receiving the trigger signal, the data acquisition card starts to measure the voltage at the two ends of the sampling resistor and converts the voltage into a USB signal to be output. The USB signal is converted into RJ45 port signal through the conversion connector, and then becomes optical signal through the photoelectric conversion module, and is transmitted to the low voltage side through the optical fiber. The photoelectric conversion module of the low-voltage side data receiving device 6 converts the received optical signal into an electrical signal, and the electrical signal is connected to an RJ45 port of a computer. The operator can record and rapidly process the data through control software designed based on Labview.
Structure and principle of data collection box 4
The core of the whole acquisition system is a data acquisition box 4 at a high-voltage side, the data acquisition box 4 is connected with a discharge circuit to complete data acquisition and conversion on site, and the specific structure is shown in fig. 2.
Fig. 2 shows that all data acquisition components are placed in a cylindrical aluminum shielding box 13, and a hanging ring for hanging is welded above the shielding box 13 and connected with the high-voltage wire 12. Considering that the device needs to be applied to a rainy condition, the shielding box 13 adopts a fully-closed design, only a wire outlet is reserved below the shielding box, and the wire outlet adopts a concave design to avoid rainwater from permeating into the collection box. The edge part of the outer side of the shielding box 13 is subjected to rounding treatment, so that the discharge of the box body in the measuring process is avoided. The shielding box 13 is divided into a plurality of layers, and different layers are connected by using internal threads. The high side precision electronics are mostly located within the data acquisition cartridge 14, and in order to avoid damage to these devices from moisture, a desiccant is used inside the cartridge.
The interior of the shielding box 13 is divided into three layers, which are separated by metal partition plates, a data acquisition box 14 is arranged on the uppermost layer, and a data acquisition card, a power supply and a photoelectric conversion module are arranged in the data acquisition box 14. These devices are placed in an organic glass sleeve, are bonded on a cuboid-shaped data acquisition box 14 divided into three layers, lead out a coaxial cable and a resistance control line, and are connected to the lower part through an opening on a partition plate. The data acquisition card used by the invention is a Handyscope HS5 virtual oscilloscope of Tiepie corporation in the Netherlands, and the data acquisition card has 14-bit resolution (16-bit enhanced resolution), the highest sampling speed can reach 500MS/s, the bandwidth of 250MHz, the memory of a single channel 32MSamples, the direct current vertical precision of 0.25 percent and the time base accuracy of 1 ppm. The photoelectric conversion module adopts a hundred-megabyte single-mode optical fiber transceiver and a video optical transceiver, the data transmission rate exceeds 100Mb/s, and the output optical signal wavelength is 1310nm and 1550 nm. The power supply is a USB mobile power supply, the output voltage is 5v, the output current can reach 2A, and the capacity of a single power supply is more than 20000 mAh.
The second layer of the shielding cage 13 houses the adjustable resistor 18 and the resistor shield 19. The precise shunt used in the invention is easily interfered by the outside, and needs electromagnetic shielding, and the resistance shielding cover 19 is connected to the metal partition plate through a screw and is communicated with the shell. The adjustable resistor 18 is arranged in the resistor shielding case 19, the adjustable resistor 18 mainly comprises a plurality of sampling resistors 24 (precision shunts), an electric control switch 23 and a switch controller 26 which are arranged on a hard PCB 25, and the remote control on-off of the resistors can be realized, so that the sampling resistance value is changed. The PCB 25 has diamond holes at its two ends, the upper end is fixed to the resistance shield 19 by copper bar, the other end is fixed to the conductive copper bar 16 of the discharge electrode 10, the conductive copper bar 16 extends downwards through the hole on the partition board.
The third layer in the shielding box 13 is an inward-concave rainproof insulating layer. Rainwater can gather at the lowest point of object, and the rainwater infiltration can be avoided to the bottom appearance design of using the indent, and the external insulating layer 17 of electrically conductive copper bar 16 is made by the hard insulating rod that the longitudinal section is "T" font, and open at the center has the round hole, supplies electrically conductive copper bar 16 to pass through, and the screw fixation is passed through in shielding case 13 bottom to the upper end, and the lower extreme is worn out to shielding case 13 below the lowest point, and the insulating rod has good mechanical strength, can be used for hanging discharge electrode 10.
Rainproof design of high-potential current acquisition system
This high potential current collection system can be in normal use under the experimental condition of drenching with the rain, in order to avoid the damage of equipment, the system has adopted multiple rain-proof design, mainly has following several:
first, the data collection box 4 on the high potential side is most likely to enter the rain range, and a precaution is required. The outside shielded cell 13 that is metal material of data acquisition box 4, whole shielded cell 13 is totally closed design, leaves the outlet below for draw-out the wiring, connects discharge electrode 10, and the outlet uses the indent design, is located shielded cell 13 internal portion, and at the box part that is close to the bottom surface simultaneously, the spraying is high 5cm, and thickness is 1 mm's hydrophobic material layer, can avoid along the rainwater that the box flows down at the bottom gathering, infiltration acquisition box. The shielding box 13 has three layers, internal thread connection is used between layers, the design that the lower layer box body is inserted into the upper layer box body is adopted, rainwater infiltration is avoided, and the good rainproof performance is achieved. Inside the shield case 13, the precision measuring instruments are mostly located inside the data collecting box 14. The data acquisition box 14 is a drawer-like plexiglass box, and the acquisition device is placed in a plexiglass sleeve, bonded to the glass box. To avoid damage to the precision instruments from moisture, the data acquisition box 14 is externally wrapped with a plastic wrap and a desiccant is placed in each layer.
Secondly, the insulation between the high potential side and the low potential side of the system is completed by the optical fiber, but under the rain condition, the high potential side is positioned at a higher position, and rainwater can flow to the low voltage side along the optical fiber, so that the insulation strength is reduced, and the equipment and personal safety at the low voltage side can be damaged. To avoid this, on the one hand, we add a one-millimeter thick sprayed layer of hydrophobic material on the surface of the fiber to prevent rain water from adhering to the surface of the fiber and flowing down the fiber. On the other hand, before the optical fiber reaches the low-voltage side, the optical fiber passes through a rainproof tower 8, the height of the optical fiber is hung in the middle, and the rainproof tower 8 is located outside a rain area. Therefore, rainwater attached to the surface of the optical fiber cannot cause insulation accidents from a high-voltage side to a low-voltage side.
Structure and principle of sampling circuit
The invention can be applied to different high-voltage discharge tests, and the discharge current flowing in the experimental circuit is from dozens of amperes to dozens of kiloamperes, so the selection range of the used sampling resistance value is very large, and the sampling resistance value can be changed from several milliohms to dozens of ohms as required. In order to meet the requirements, the PCB 25 is used as a carrier for fixing the resistor, and the resistor fixing device has the advantages of convenience in disassembly, high temperature resistance and the like. After the used resistance is determined, the sampling resistance value can be conveniently adjusted by controlling the on-off of the electric control switch 23.
As shown in fig. 3, the sampling resistor 24, the electronic control switch 23, the TVS voltage regulator tube 22 and the switch controller 26 are fixed on the customized PCB 25, and the resistance value of the sampling resistor 24 varies from 1.5 milli-ohms to 500 ohms, and can be assembled and disassembled as required. The sampling resistors 24 are arranged in a straight line, and two ends of each sampling resistor 24 are connected in parallel with one TVS for protection. All the sampling resistors 24 are connected in series end to end and then connected to the terminals at the two ends of the discharge tube 21. The voltage measuring cable 15 (coaxial cable) obtains voltage signals from the two terminals and inputs the voltage signals into the data acquisition card. The invention uses the relay as the electric control switch 23 to control the connection of the sampling resistors 24, the electric control switch 23 is connected in parallel at the two ends of each sampling resistor 24 and is controlled by the switch controller 26 in a unified way. The control signal is sent from the low voltage side, is subjected to photoelectric conversion, and is input into the circuit of the switch controller 26. The switch controller 26 controls the corresponding electric control switch 23 to be switched on and off according to the input signal, and adjusts the resistance value of the access circuit.
Structure and principle of trigger device
Fig. 4 is a schematic diagram of a voltage comparator type trigger source, in which an input voltage signal obtained by a capacitive voltage divider 27 is input to a non-inverting input terminal of a voltage comparator, when the input voltage is higher than a reference voltage, the voltage comparator outputs a high level, and the high level signal is converted and transmitted to be connected to an external trigger input interface of a data acquisition card to trigger the acquisition card to start measurement.
Fig. 5 and 6 are schematic diagrams of optical signal triggering and magnetic induction triggered triggering sources. The optical signal triggering mode is that when the experiment of the optical phenomenon is obvious, an optical probe 33 can be placed near the light-emitting position, the collected optical signal is converted into a current signal through a photomultiplier 32, and then the current signal is converted into a current signal through a signal conversion resistor R0The voltage signal is converted into a voltage signal, the voltage signal is input to a non-inverting input end of the voltage comparator, and when the voltage is higher than a reference voltage value set at an inverting input end, the voltage comparator outputs a high level which is approximately equal to + Vcc. The high level signal is converted into an optical signal by the photoelectric conversion device 7, transmitted into the high-voltage side data acquisition box 14 through the optical fiber, reconverted into an electrical signal by the photoelectric conversion module at the high-voltage side, and then connected to the external trigger input port of the data acquisition card to trigger the acquisition card. The magnetic induction triggering mode is that the magnetic induction coil 34 is arranged near the lower part of the discharge electrode, the voltage drop at two ends of the magnetic induction coil 34 is input into a voltage comparator, and the signal acquisition card is triggered to work after the same voltage comparison, signal conversion and transmission.
The system can be suitable for various high-voltage discharge experiments, and in order to realize accurate triggering under different experimental conditions, the triggering system of the device comprises various triggering modes. When the voltage-boosting pulse voltage generator is used, the voltage-boosting pulse voltage generator can be selected according to experiment conditions and measurement requirements, and when the impulse voltage is used for experiments, the boosting waveform has an obvious rising edge and is suitable for a voltage comparator triggering mode; when a direct current pressurization experiment is carried out, the voltage comparator triggering mode is not applicable any more, and then a magnetic induction triggering mode can be selected to trigger by utilizing the electromagnetic reaction in the experiment process; when performing experiments where optical phenomena are significant, the light probe 33 may be placed near the light emitting location and triggered using the collected light signal.
Charging system of high potential current acquisition system
The high potential current collection system is bulky, and it is very difficult to detach and transport the high potential current collection system from the high voltage side to the low voltage side during charging. Therefore, based on the conditions of outdoor experiments, the invention designs a system capable of carrying out charging in situ at high potential, and the specific structure is shown in fig. 7 and 8.
The figure shows that the charging system is composed of a solar cell panel 1, a remote-controllable telescopic arm 30 and a charging wire 31 fixed on the telescopic arm 30. Solar cell panel 1 is fixed in cross arm 2 top for collect and change solar energy, and solar cell panel 1's delivery outlet is connected to charging wire 31 behind the voltage converter, and charging wire 31 is resistant folding soft USB line, fixes on flexible arm 30, can fold along with flexible arm 30 and pack up. Flexible arm 30 can remote control, when discharging the experiment, packs up flexible arm 30, avoids influencing insulating properties, controls flexible arm 30 when will charging and extends, transfers charging wire 31 near the collection box top, is connected to the battery in the data acquisition box by operating personnel, charges on the spot.
Claims (8)
1. A high potential current collection system with a rainproof function is characterized by comprising a data collection box (4), a data receiving device (6) and a trigger device, wherein the data collection box (4) comprises a shielding box (13), a data collection box (14) and an adjustable resistor (18) which are installed in the shielding box (13), the shielding box (13) is connected with a high-voltage lead (12) and hung on a cross arm (2) through an insulator (3), one end of the adjustable resistor (18) is electrically connected with the shielding box (13) through a resistor shielding cover (19) which covers the outer part of the adjustable resistor (18), the other end of the adjustable resistor (18) is electrically connected with a discharge electrode (10) below the shielding box (13) through a conductive copper bar (16) which is externally provided with an insulating layer (17), a resistance control line (20) of the adjustable resistor (18) and a voltage measurement cable (15) are connected with the data collection box (14), the data acquisition box (14) exchanges information with the data receiving device (6) and the triggering device through the optical fiber (5);
a rainproof cover (11) is arranged at the part of the conductive copper bar (16) outside the shielding box (13);
the adjustable resistor (18) comprises a plurality of sampling resistors (24) arranged on a PCB (25) and an electric control switch (23) and a TVS voltage regulator tube (22) corresponding to each sampling resistor (24), the sampling resistors (24) are connected in series and then connected between a resistor shielding cover (19) and a conductive copper bar (16) and connected with a data acquisition box (14) through a voltage measurement cable (15), a normally open contact of each electric control switch (23) and each TVS voltage regulator tube (22) are connected in parallel on the corresponding sampling resistor (24), an on-off controller (26) of the electric control switch (23) is connected with the data acquisition box (14) through a resistance control line (20), a discharge tube (21) is further arranged on the PCB (25), and the discharge tube (21) is connected between the resistor shielding cover (19) and the conductive copper bar (16).
2. The high potential current collection system with the rainproof function according to claim 1, wherein the interior of the shielding box (13) is divided into an upper cavity, a middle cavity and a lower cavity by a metal partition plate, the data collection box (14) is fixed in the upper cavity, the adjustable resistor (18) and the resistor shielding cover (19) outside the adjustable resistor are located in the middle cavity, and the conductive copper bar (16) provided with the insulating layer (17) outside the adjustable resistor penetrates through the concave bottom plate of the shielding box (13) and the center hole of the lower partition plate to be connected with the discharge electrode (10) and the adjustable resistor (18).
3. The high-potential current collecting system with the rainproof function as claimed in claim 2, wherein the side wall of the shielding box (13) is cylindrical and is divided into three sections along the vertical axis of the shielding box, the adjacent two sections are connected through external threads at the upper end of the lower section and internal threads at the lower end of the upper section, and hydrophobic materials are coated around the lower end of the shielding box (13).
4. The high-potential current collection system with the rainproof function according to claim 3, wherein the trigger device comprises a trigger source and a photoelectric conversion device (7), and a trigger signal generated by the trigger source is converted into an optical signal by the photoelectric conversion device (7) and then sent to the data collection box (14) through the optical fiber (5).
5. The high-potential current collection system with the rainproof function according to claim 4, wherein the position, close to the data receiving device (6) and the photoelectric conversion device (7), of the optical fiber (5) is hung up by a rainproof tower (8).
6. The high-potential current collection system with the rainproof function according to claim 5, wherein the system further comprises a solar cell panel (1), the solar cell panel (1) is fixed on the cross arm (2) and charges a storage battery in the data collection box (14) through a charging wire (31), and the charging wire (31) is fixed on a remote control telescopic arm (30) on the solar cell panel (1).
7. The high-potential current collection system with the rainproof function according to claim 6, wherein the trigger source comprises a capacitive voltage divider (27), a decay circuit (28) and a voltage comparator (29), one end of the capacitive voltage divider (27) is grounded, the other end of the capacitive voltage divider is connected with the impulse voltage generator, a voltage signal output by the capacitive voltage divider (27) is processed by the decay circuit (28) and then sent to a non-inverting input end of the voltage comparator (29), an inverting input end of the voltage comparator (29) is connected with a reference voltage, and an output end of the voltage comparator is connected with an input end of the photoelectric conversion device (7).
8. The high-potential current collection system with the rainproof function according to claim 7, wherein the trigger source comprises an optical probe (33), a photomultiplier (32) and a voltage comparator (29), the optical probe (33) receives an optical signal generated by high-voltage discharge, an optical signal input end of the photomultiplier (32) is connected with the optical probe (33), and a current signal output end passes through a signal conversion resistor
Grounding and signal conversion resistor
The output voltage signal is connected with the non-inverting input end of a voltage comparator (29), the inverting input end of the voltage comparator (29) is connected with the reference voltage, and the output end is connected with the input end of the photoelectric conversion device (7);
the trigger source comprises a magnetic induction coil (34) and a voltage comparator (29), the magnetic induction coil (34) is arranged below the discharge electrode (10), a voltage signal output by the magnetic induction coil (34) is connected with an input end of the voltage comparator (29), and an output end of the voltage comparator (29) is connected with an input end of the photoelectric conversion device (7).
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| CN109387745B (en) * | 2018-12-21 | 2020-06-05 | 云南电网有限责任公司电力科学研究院 | Overvoltage sensing device for power distribution network |
| CN109725193A (en) * | 2019-02-25 | 2019-05-07 | 云南电网有限责任公司红河供电局 | It is a kind of for running the suspension type neutral point undervoltage detection means for doing anti-defect diagonsis |
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