CN117706285A - Alternating current high-voltage measurement system with adjustable voltage dividing ratio - Google Patents
Alternating current high-voltage measurement system with adjustable voltage dividing ratio Download PDFInfo
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- CN117706285A CN117706285A CN202311575531.9A CN202311575531A CN117706285A CN 117706285 A CN117706285 A CN 117706285A CN 202311575531 A CN202311575531 A CN 202311575531A CN 117706285 A CN117706285 A CN 117706285A
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- 238000005259 measurement Methods 0.000 title claims abstract description 23
- 238000012360 testing method Methods 0.000 claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 238000009413 insulation Methods 0.000 claims description 5
- 150000004996 alkyl benzenes Chemical class 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 5
- 230000008602 contraction Effects 0.000 abstract description 2
- 230000001965 increasing effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
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Abstract
The invention discloses an alternating current high-voltage measurement system with adjustable partial pressure ratio, which comprises: the measuring device is used for converting the high-voltage electric signal into a voltage dividing bridge arm of the high-voltage electric signal and measuring the test high voltage in the alternating-current withstand voltage test; the voltage dividing bridge arm comprises a high-voltage wiring terminal, an upper high-voltage bridge arm, a lower high-voltage bridge arm, a low-voltage bridge arm, a signal output socket and a grounding terminal; the measuring device comprises an analog-to-digital conversion unit, a control unit, a display unit and an external key. The invention has wide application range and can be applied to alternating current withstand voltage tests of 66kV and 220kV power equipment; the structure is simple, the use is convenient, the split ratio can be changed through the expansion and contraction of the bridge arm and the conversion of the knob, the working efficiency is improved, and the working strength of operators is reduced; the design is in a form of adjustable voltage dividing ratio, so that the purchasing requirements of similar measuring systems with different parameter specifications are reduced; the portable electric power tool is small in size, convenient to carry, high in practicality and suitable for being used on the operation site.
Description
Technical Field
The invention relates to the field of alternating current withstand voltage tests of power transmission and transformation equipment of a power system, in particular to an alternating current high-voltage measurement system with an adjustable voltage dividing ratio.
Background
Along with the continuous promotion of urban power grid scale, the improvement engineering of original power transmission and transformation equipment is increased, and the reliability of newly-accessed power equipment is ensured to become an important research topic in a power system. Among them, the ac withstand voltage test is a method for finding out a centralized defect of the danger of the electric equipment and checking the insulation strength of the equipment most directly and effectively, so that the ac withstand voltage test in the electric power system is increasing in recent years. In order to ensure that the voltage value applied during the alternating-current withstand voltage test meets the regulation requirement, an alternating-current high-voltage measuring system is required to monitor the test voltage on the operation site.
The common alternating current high-voltage measurement system adopts a design mode of fixed voltage division ratio, and the alternating current high-voltage measurement system with corresponding measuring range is selected according to the voltage level of the tested equipment, so that the alternating current high-voltage measurement systems with different measuring ranges are required to be equipped for voltage withstand tests with different voltage levels to ensure the measurement precision, the purchase quantity of instruments is increased, the production cost is increased, the risk of wrong instrument taking by test personnel is increased, and the later use and maintenance cost of the instruments is increased. For the use and maintenance of the instrument, the production practice is fully considered, the use convenience of the field instrument is improved as much as possible on the premise of ensuring the field safety, the work load of test personnel is reduced, and the field work efficiency is improved. Therefore, based on the traditional alternating current high voltage measurement system, a set of alternating current high voltage measurement system with adjustable voltage dividing ratio, simple structure and reliable insulation is designed.
Disclosure of Invention
Aiming at the problems, the invention provides the alternating-current high-voltage measuring system which is simple in structure, reliable in insulation and convenient to use and is used for adjusting the voltage division ratio in the alternating-current withstand voltage test, so that the work load of field operators can be reduced, the use convenience of instruments and meters can be improved, the later maintenance cost can be reduced, and a solid guarantee is provided for improving the quality and enhancing the efficiency of a power grid system.
In order to achieve the above object, the present invention provides an ac high voltage measurement system with adjustable voltage dividing ratio, comprising: the measuring device is used for converting the high-voltage electric signal into a voltage dividing bridge arm of the high-voltage electric signal and measuring the test high voltage in the alternating-current withstand voltage test;
the voltage dividing bridge arm includes: the high-voltage wiring terminal is a terminal connected with tested equipment, the high-voltage wiring terminal is connected with one end of an upper high-voltage bridge arm, the other end of the upper high-voltage bridge arm is connected with one end of a lower high-voltage bridge arm, the other end of the lower high-voltage bridge arm is connected with one end of a low-voltage bridge arm, the other end of the low-voltage bridge arm is connected with one end of a signal output socket, the other end of the signal output socket is connected with one end of a special signal wire, and the other end of the special signal wire is connected with a measuring device; the grounding terminal is a terminal connected with the ground wire of the tested equipment;
the measuring device includes: the isolating switch of the analog-to-digital conversion unit is connected with the special signal line, the isolating switch is used for electrically isolating the low-voltage electric signal output by the voltage dividing bridge arm from the measuring device, the analog-to-digital converter of the analog-to-digital conversion unit is used for converting the voltage signal into a digital signal, and the output end of the analog-to-digital conversion unit is connected with the input end of the control unit; the control unit is used for processing the binary digital signal transmitted by the analog-to-digital conversion unit and converting the binary digital signal into decimal numbers with metering units, the output end of the control unit is connected with the input end of the display unit, and the input end of the control unit is also connected with the output end of the external key; and the external key is used for setting the system voltage dividing ratio and the on-site temperature parameter.
In the preferred mode, the upper section high-voltage bridge arm and the lower section high-voltage bridge arm are of telescopic structures, and the high-voltage capacity is changed by stretching or compressing the upper section high-voltage bridge arm and the lower section high-voltage bridge arm.
In a preferred mode, the high-voltage bridge arm cylinder bodies are sleeved outside the upper section and the lower section, and alkylbenzene oil for insulation is filled inside the high-voltage bridge arm cylinder bodies.
In a preferred mode, the low-voltage bridge arm adopts a knob type structure, and different low-voltage capacities are obtained by changing the internal circuit structure of the low-voltage bridge arm through selecting different gears.
The beneficial effects of the invention are as follows: the application range is wide, and the method can be applied to alternating current withstand voltage tests of 66kV and 220kV power equipment; the structure is simple, the use is convenient, the split ratio can be changed through the expansion and contraction of the bridge arm and the conversion of the knob, the working efficiency is improved, and the working strength of operators is reduced; the design is in a form of adjustable voltage dividing ratio, so that the purchasing requirements of similar measuring systems with different parameter specifications are reduced; the portable electric power tool is small in size, convenient to carry, high in practicality and suitable for being used on the operation site.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic structural diagram of a high-voltage bridge arm according to the present invention;
FIG. 3 is an electrical schematic of the low voltage leg of the present invention;
FIG. 4 is a schematic diagram of the structure of the measuring device of the present invention;
fig. 5 is a schematic diagram of the operation of the present invention.
In the figure: 1. a high voltage terminal; 2. a high-voltage bridge arm cylinder; 3. a connection point; 4. a signal output socket; 5. a ground terminal; 6. an upper section high-voltage bridge arm; 7. a lower section high-voltage bridge arm; 8. a low-voltage bridge arm; 9. a measuring device; 10. a dedicated signal line; 11. the device under test.
Detailed Description
Specific examples:
the invention relates to an alternating current high-voltage measurement system with an adjustable voltage dividing ratio, which consists of a voltage dividing bridge arm and a measurement device.
The voltage division bridge arm comprises a high-voltage bridge arm and a low-voltage bridge arm, and can convert a high-voltage electric signal into a low-voltage electric signal. The high-voltage bridge arm is connected with the low-voltage bridge arm in series, the high-voltage bridge arm adopts a telescopic shape design, and the high-voltage capacity is changed by stretching or compressing the bridge arm; the low-voltage bridge arm adopts a knob design, and the internal circuit structure of the bridge arm is changed to obtain different low-voltage capacities by selecting different gears, so that the function of adjusting the voltage dividing ratio of the high-voltage alternating current measuring system is realized. The high-voltage bridge arm and the low-voltage bridge arm are respectively designed with an oil-immersed paper aluminum foil capacitor, and alkylbenzene oil with the electrical strength of more than 50kV/25mm is selected as a main insulating material, and the temperature coefficient of the high-voltage element is less than 50PPM, so that the whole high-voltage measurement system has better stability. In order to ensure the reliability of the whole system, the low-voltage bridge arm is not provided with any electric adjusting device, and the measuring precision of the system is not affected by the displacement of the adjustable point caused by vibration.
The measuring device is independent of the partial pressure bridge arm and consists of an analog-to-digital conversion unit, a control unit, a key and a display unit. The analog-to-digital conversion unit is composed of an isolating switch and an analog-to-digital converter, the isolating switch realizes the electrical isolation between the voltage-dividing voltage signal output by the voltage dividing bridge arm and the measuring device, and the measuring part is completely separated from the high-voltage part, so that the safety and reliability in use are ensured. The analog-to-digital converter converts the voltage signal into a digital signal, and transmits the digital signal to the control unit. The control unit processes the binary digital signal transmitted by the analog-to-digital conversion unit, converts the binary digital signal into decimal numbers with measurement units and displays the decimal numbers through the display unit; the control unit can complete the setting of parameters such as the system voltage dividing ratio, the site temperature and the like through the operation of an external key. The display unit realizes the display function of the data parameters.
As shown in fig. 1, the alternating current high-voltage measurement system with the adjustable voltage division ratio comprises a high-voltage bridge arm cylinder body 2 filled with oil internally, a low-voltage bridge arm 8 and a measurement device 9, wherein the high-voltage bridge arm cylinder body 2 and the low-voltage bridge arm 8 are connected in series and connected with a signal output socket 4, and a low-voltage signal obtained by voltage division is transmitted to the measurement device 9.
As shown in fig. 2, the high-voltage bridge arm cylinder is designed into a two-section telescopic structure, and when the upper section high-voltage bridge arm 6 and the lower section high-voltage bridge arm 7 are connected in series and straightened, the capacitance of the high-voltage bridge arm cylinder 2 is 1000pf; when the upper high-voltage bridge arm 6 and the lower high-voltage bridge arm 7 are connected in compression parallel, the capacitance of the high-voltage bridge arm cylinder 2 is 4000pf. The capacitance of the low-voltage bridge arm 8 is designed to be adjustable in three gears of 1000nf, 2000nf and 3000nf, and voltage conversion with the voltage division ratio of 250:1, 500:1, 750:1, 1000:1, 2000:1 and 3000:1 is realized through the serial connection with the high-voltage bridge arm barrel 2. Therefore, the AC high-voltage signal of 1-300 kV can be safely and accurately measured while the output voltage of the low-voltage bridge arm is ensured to be within the range of 40-100V.
As shown in fig. 3, the low-voltage bridge arm 8 is composed of three identical capacitors with the capacitance of 2000nf, and the capacitance of the low-voltage bridge arm 8 is designed to be three gears of 1000nf, 2000nf and 3000nf, and the implementation manner is shown in table 1, wherein 0 represents that an operation knob controls the switch to be opened, and 1 represents that the switch is closed.
TABLE 1
| K1 | K2 | Capacitance (nf) |
| 0 | 0 | 1000 |
| 1 | 0 | 2000 |
| 0 | 1 | 3000 |
As shown in fig. 4, the measuring device adjusts the control unit by key operation to complete parameter setting of different voltage division ratios. The analog-to-digital conversion unit converts the low-voltage electric signals transmitted by the high-voltage bridge arm and the low-voltage electric signals into digital signals, and the digital signals are calculated and tidied by the control unit and sent to the display unit for display.
Fig. 5 shows the application of the present invention in actual operation, in which the test high voltage measurement operation in the ac withstand voltage test is realized by being connected in parallel with the device under test 11. The high voltage terminal 1 is connected to the device under test 11, the contact terminal 5 is connected to the ground, the signal output socket 4 is connected to the measuring device 9 via the dedicated signal line 10, and when the ac voltage is applied to the device under test 11 exceeding 100V, the peak value, the effective value and the voltage waveform of the voltage signal are displayed on the measuring device 9.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should be covered by the protection scope of the present invention by making equivalents and modifications to the technical solution and the inventive concept thereof.
Claims (4)
1. An ac high voltage measurement system with adjustable voltage dividing ratio, characterized in that it comprises: the measuring device is used for converting the high-voltage electric signal into a voltage dividing bridge arm of the high-voltage electric signal and measuring the test high voltage in the alternating-current withstand voltage test;
the voltage dividing bridge arm includes: the high-voltage wiring terminal is a terminal connected with tested equipment, the high-voltage wiring terminal is connected with one end of an upper high-voltage bridge arm, the other end of the upper high-voltage bridge arm is connected with one end of a lower high-voltage bridge arm, the other end of the lower high-voltage bridge arm is connected with one end of a low-voltage bridge arm, the other end of the low-voltage bridge arm is connected with one end of a signal output socket, the other end of the signal output socket is connected with one end of a special signal wire, and the other end of the special signal wire is connected with a measuring device; the grounding terminal is a terminal connected with the ground wire of the tested equipment;
the measuring device includes: the isolating switch of the analog-to-digital conversion unit is connected with the special signal line, the isolating switch is used for electrically isolating the low-voltage electric signal output by the voltage dividing bridge arm from the measuring device, the analog-to-digital converter of the analog-to-digital conversion unit is used for converting the voltage signal into a digital signal, and the output end of the analog-to-digital conversion unit is connected with the input end of the control unit; the control unit is used for processing the binary digital signal transmitted by the analog-to-digital conversion unit and converting the binary digital signal into decimal numbers with metering units, the output end of the control unit is connected with the input end of the display unit, and the input end of the control unit is also connected with the output end of the external key; and the external key is used for setting the system voltage dividing ratio and the on-site temperature parameter.
2. The ac high voltage measurement system with adjustable voltage dividing ratio according to claim 1, wherein the upper and lower high voltage bridge arms are of telescopic structure, and the high voltage capacity is changed by stretching or compressing the upper and lower high voltage bridge arms.
3. The alternating current high-voltage measurement system with the adjustable voltage dividing ratio according to claim 1, wherein a high-voltage bridge arm cylinder is sleeved outside the upper section high-voltage bridge arm and the lower section high-voltage bridge arm, and alkylbenzene oil for insulation is filled inside the high-voltage bridge arm cylinder.
4. The alternating current high voltage measurement system with adjustable voltage dividing ratio according to claim 1, wherein the low voltage bridge arm adopts a knob type structure, and different low voltage capacities are obtained by changing the internal circuit structure of the low voltage bridge arm by selecting different gears.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311575531.9A CN117706285A (en) | 2023-11-23 | 2023-11-23 | Alternating current high-voltage measurement system with adjustable voltage dividing ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311575531.9A CN117706285A (en) | 2023-11-23 | 2023-11-23 | Alternating current high-voltage measurement system with adjustable voltage dividing ratio |
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| Publication Number | Publication Date |
|---|---|
| CN117706285A true CN117706285A (en) | 2024-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311575531.9A Pending CN117706285A (en) | 2023-11-23 | 2023-11-23 | Alternating current high-voltage measurement system with adjustable voltage dividing ratio |
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| Country | Link |
|---|---|
| CN (1) | CN117706285A (en) |
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2023
- 2023-11-23 CN CN202311575531.9A patent/CN117706285A/en active Pending
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