CN106950525A - A kind of pulse low current calibrating installation - Google Patents
A kind of pulse low current calibrating installation Download PDFInfo
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- CN106950525A CN106950525A CN201710159484.8A CN201710159484A CN106950525A CN 106950525 A CN106950525 A CN 106950525A CN 201710159484 A CN201710159484 A CN 201710159484A CN 106950525 A CN106950525 A CN 106950525A
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- 238000009434 installation Methods 0.000 title abstract 3
- 239000004020 conductor Substances 0.000 claims description 50
- 239000002184 metal Substances 0.000 claims description 36
- 230000004044 response Effects 0.000 claims description 8
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- 239000000919 ceramic Substances 0.000 claims description 5
- 230000001939 inductive effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 235000018290 Musa x paradisiaca Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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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
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
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Abstract
It is more particularly to a kind of to produce and calibrate the experimental provision of milliampere or microampere order pulse low current the present invention relates to a kind of pulse low current calibrating installation, belong to high voltage and field of gas discharge.A kind of pulse low current calibrating installation, including：Impulse generator, metallic cavity, inner wire A, current-limiting resistance, inner wire B, coaxial shunt and Rogowski coil；Wherein, the inner wire A, current-limiting resistance, inner wire B and coaxial shunt are sequentially connected the inside for being placed in metallic cavity, and Rogowski coil is sleeved on current-limiting resistance；The current signal of the inner wire A connections impulse generator, coaxial shunt and Rogowski coil measurement is connected by cable with oscillograph.The present invention can produce stably and controllable pulse low current signal, calibration and demarcation available for pulse small current measurement system in different field.
Description
Technical Field
The invention relates to the field of high voltage and gas discharge, in particular to an experimental device capable of generating and calibrating milliampere or microampere pulse small current.
Background
Corona discharge is a localized self-sustaining discharge that occurs in a non-uniform electric field. Corona discharge is usually composed of a series of individual discharge pulses, the repetition rate of which is high; corona discharge can generate high frequency pulse current, and is an important electromagnetic interference source. Corona on a high-voltage transmission line lead in a power system can not only cause electric energy loss of the line, but also generate strong radio interference and audible noise to influence the surrounding electromagnetic environment. Corona discharge or partial discharge of other high voltage devices such as electrical machines, transformers, gas insulated substations and other electrical equipment can also have a significant impact on the operation and life of the equipment.
The high-frequency pulse current generated by corona discharge has the characteristics of small amplitude, fast pulse, high repetition frequency and the like, the rising edge of a single discharge pulse is generally several nanoseconds to dozens of nanoseconds, the pulse width is generally dozens of nanoseconds to hundreds of nanoseconds, and the amplitude of the pulse current is generally microamperes to milliamperes. The pulse and amplitude characteristics of the corona current are related to the polarity of the corona discharge and other experimental and environmental conditions, but due to the instability of the corona discharge, the pulse characteristics of the corona current are different even under the same experimental conditions and environments. Therefore, the calibration of the corona current measuring device is of crucial importance.
The common corona current measuring method or device mainly comprises a rogowski coil, a sampling resistor, a coaxial current divider and the like. The problems with current corona current or other pulsed low current measurements are as follows: the current amplitude is small, the discharge stability is poor, the external interference is easy to cause, and the current repeatability is poor; the discharge pulse is fast, and the requirement on the high-frequency response of a measuring system is high; the measurement method is more, but the measurement data is poor in contrast due to the lack of an effective calibration means.
Disclosure of Invention
The invention aims to solve the problems of instability and uncontrollable pulse small current generated by corona or other discharge forms, and provides a pulse small current generating and calibrating device with stable and controllable parameters. The pulse small current calibration device can generate milliampere to microampere pulse current, pulse parameters and current amplitude can be controlled by a pulse generator and a current-limiting resistor, and pulse small currents with different parameters can be generated and used for calibrating a pulse small current measurement system.
The purpose of the invention is realized by the following technical scheme:
a pulsed small current calibration device comprising: the device comprises a pulse generator, a metal cavity, an inner conductor A, a current-limiting resistor, an inner conductor B, a coaxial shunt and a Rogowski coil; wherein,
the inner conductor A, the current-limiting resistor, the inner conductor B and the coaxial shunt are sequentially connected and arranged in the metal cavity, and the Rogowski coil is sleeved on the current-limiting resistor; the inner conductor A is connected with a pulse generator, and current signals measured by the coaxial shunt and the Rogowski coil are connected with an oscilloscope through a cable.
Further, the metal cavity is grounded or connected with the grounding end of the pulse generator.
Further, the metal cavity comprises a front end cover, a main cavity and a rear end cover, a BNC connector is fixed on the front end cover, and the inner conductor A is connected with the pulse generator through the BNC connector; the coaxial shunt comprises a high-voltage end and a BNC connector end, the high-voltage end is connected with the inner conductor B, and the BNC connector end is used for leading out a measured current signal through a cable.
Furthermore, a round hole A is formed in the middle of the metal cavity, and a cable connected with the Rogowski coil is led out through the round hole A in the metal cavity.
Further, the rear end cover of the metal cavity is connected with the main cavity through a hinge, and a round hole B is formed in the middle of the rear end cover and used for leading out a BNC connector of the coaxial shunt.
Furthermore, the metal cavity, the inner conductor a, the current limiting resistor, the inner conductor B and the coaxial shunt together form a coaxial structure, the outer diameter of the coaxial structure is the outer diameter of the metal cavity, and the inner diameter of the coaxial structure is the diameter of the inner conductor a or the inner conductor B. The characteristic impedance of a coaxial structure consisting of the metal cavity, the inner conductor A, the current-limiting resistor, the inner conductor B and the coaxial shunt is the same as that of an output cable of the pulse generator. The inner and outer diameter dimensions of the coaxial structure are determined by the characteristic impedance of the coaxial structure.
Furthermore, the pulse generator is a generator or a pulse power supply capable of outputting pulse waveforms with adjustable parameters, and the pulse generator outputs pulse signals through a coaxial cable.
Furthermore, the current-limiting resistor is a high-frequency non-inductive rod-shaped ceramic resistor, and the diameter of the current-limiting resistor is the same as or similar to that of the inner conductor A/the inner conductor B; the frequency response range of the current-limiting resistor is determined by the pulse waveform output by the pulse generator, and the upper limit of the frequency response of the current-limiting resistor is not less than 1/4t of the rising edge (t) of the output pulse.
Furthermore, the pulse generator is connected with one end of a BNC connector positioned outside the metal cavity on the front end cover through a coaxial cable, the BNC connector is positioned inside the metal cavity and connected with one end of the inner conductor A, the other end of the inner conductor A is connected with one end of a current-limiting resistor, the other end of the current-limiting resistor is connected with one end of the inner conductor B, the other end of the inner conductor B is connected with a high-voltage end of the coaxial shunt, and the BNC connector end of the coaxial shunt is used for leading out a measured current signal through the cable.
The invention has the beneficial effects that:
the invention determines the output pulse parameter of the pulse generator according to the pulse current waveform which needs to be generated or calibrated, determines the amplitude of the output pulse by the current limiting resistor, and can avoid the reflection of the pulse signal during transmission and the interference of the external environment to the pulse small current by the coaxial structure. The coaxial shunt and the Rogowski coil are used for measuring the pulse small current in the loop, and the measured current waveform is compared with the output pulse signal of the pulse generator, so that the calibration and calibration of the coaxial shunt and the Rogowski coil can be realized.
The pulse small current calibration device can generate stable and controllable milliamp to microamp pulse current, can realize calibration and calibration of the pulse small current measurement device, and is used for calibration of corona discharge, partial discharge and other discharge medium current measurement systems generating pulse small current.
Drawings
FIG. 1 is a schematic structural diagram of a pulse low current calibration device according to the present invention;
the pulse generator comprises a pulse generator 1, a metal cavity 2, an inner conductor A31, an inner conductor B32, a current limiting resistor 4, a coaxial shunt 5 and a Rogowski coil 6.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A pulsed low current calibration device, as shown in fig. 1, comprising: the pulse generator 1, the metal cavity 2, the inner conductor A31, the current limiting resistor 4, the inner conductor B32, the coaxial shunt 5 and the Rogowski coil 6; wherein,
the inner conductor A31, the current-limiting resistor 4, the inner conductor B32 and the coaxial shunt 5 are sequentially connected and are arranged in the metal cavity 2, and the Rogowski coil 6 is sleeved on the current-limiting resistor 4; the inner conductor A31 is connected with the pulse generator 1, and the current signals measured by the coaxial shunt 5 and the Rogowski coil 6 are connected with an oscilloscope through cables. The metal cavity 2 is grounded or connected with the grounding end of the pulse generator. The metal cavity 2, the inner conductor A31, the current limiting resistor 4, the inner conductor B32 and the coaxial shunt 5 form a coaxial structure together. The characteristic impedance of the coaxial structure is the same as the characteristic impedance of the output cable of the pulse generator 1.
The metal cavity 2 comprises a front end cover, a main cavity and a rear end cover, a BNC connector is fixed on the front end cover, and the inner conductor A31 is connected with the pulse generator 1 through the BNC connector; the coaxial shunt 5 comprises a high-voltage end connected to the inner conductor B32 and a BNC connector end for leading out a measured current signal through a cable.
And a round hole A is formed in the metal cavity 2, and a cable connected with the Rogowski coil 6 is led out through the round hole A in the metal cavity 2.
The rear end cover of the metal cavity 2 is connected with the main cavity through a hinge, and a round hole B is formed in the middle of the rear end cover and used for leading out a BNC connector of the coaxial shunt 5.
The current limiting resistor 4 is a high-frequency non-inductive rod-shaped ceramic resistor; the frequency response range of the current-limiting resistor 4 is determined by the pulse waveform output by the pulse generator 1, and the upper limit of the frequency response is not less than 1/4t of the rising edge (t) of the output pulse.
This embodiment is exemplified by a corona current measuring device with a calibrated amplitude of 10mA, a pulse rising edge of 10ns, and a pulse width of 50 ns. The pulse generator outputs voltage pulse with pulse rising edge of 10ns, pulse width of 50ns and amplitude of 1V, and the current limiting resistor is rod-shaped ceramic resistor with resistance of 100 Ω and frequency response upper limit not less than 25 MHz. The characteristic impedance of the output cable of the pulse generator is 50 omega, the characteristic impedance of a coaxial structure consisting of the metal cavity, the inner conductor, the current limiting resistor and the coaxial shunt is 50 omega, and the characteristic impedance is related to the inner diameter and the outer diameter of the coaxial structure, so that the diameters of the metal cavity and the inner conductor can be determined, wherein the diameter of the inner conductor A is the same as that of the inner conductor B.
The working process of the invention is as follows: the pulse generator is connected to a BNC connector of a front end cover of the metal cavity through a coaxial cable with characteristic impedance of 50 ohms, an inner conductor A is connected with a 100-ohm bar-shaped ceramic current-limiting resistor through threads, a Rogowski coil is sleeved on the current-limiting resistor, a coaxial shunt is connected with an inner conductor B through threads, and the inner conductor A is connected with a central conductor of the BNC connector of the front end cover of the metal cavity through a banana plug. After all parts in the metal cavity are assembled, the rear end cover is closed, the BNC connector end of the coaxial shunt is led out from the circular hole of the rear end cover, the outer conductor of the BNC connector of the coaxial shunt is connected with the rear end cover, and the metal cavity is grounded.
The pulse generator is adjusted to output voltage pulses with the pulse rising edge of 10ns, the pulse width of 50ns and the amplitude of 1V, current signals measured by the Rogowski coil and the coaxial shunt are connected to an oscilloscope through a coaxial cable with 50 omega characteristic impedance, and calibration of the Rogowski coil and the coaxial shunt can be realized by comparing the output pulse waveforms of the pulse generator with the current waveforms measured by the Rogowski coil and the coaxial shunt.
The invention can generate stable and controllable pulse small current signals and can be used for calibrating and calibrating pulse small current measurement systems in different fields.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A pulsed low current calibration device, comprising: the device comprises a pulse generator (1), a metal cavity (2), an inner conductor A (31), a current-limiting resistor (4), an inner conductor B (32), a coaxial shunt (5) and a Rogowski coil (6); wherein,
the inner conductor A (31), the current-limiting resistor (4), the inner conductor B (32) and the coaxial shunt (5) are sequentially connected and arranged in the metal cavity (2), and the Rogowski coil (6) is sleeved on the current-limiting resistor (4); the inner conductor A (31) is connected with the pulse generator (1), and current signals measured by the coaxial shunt (5) and the Rogowski coil (6) are connected with an oscilloscope through cables.
2. The pulsed small current calibration device according to claim 1, characterized in that the metal cavity (2) is grounded or connected to the ground of the pulse generator.
3. The pulse undercurrent calibration device according to claim 1, wherein said metal chamber (2) comprises a front end cap, a main chamber and a rear end cap, a BNC connector is fixed on said front end cap, said inner conductor A (31) is connected with the pulse generator (1) through the BNC connector; the coaxial shunt (5) comprises a high-voltage end and a BNC connector end, wherein the high-voltage end is connected with the inner conductor B (32), and the BNC connector end is used for leading out a measured current signal through a cable.
4. The pulse small current calibration device according to claim 1, characterized in that a round hole A is arranged on the metal cavity (2), and a cable connected with the Rogowski coil (6) is led out through the round hole A on the metal cavity (2).
5. The pulsed undercurrent calibration device according to claim 3, characterized in that the rear end cap of the metal chamber (2) is connected to the main chamber by means of a hinge, and a circular hole B is provided in the middle of the rear end cap for leading out the BNC connector of the coaxial shunt (5).
6. The pulse small current calibration device according to claim 1, wherein the metal cavity (2), the inner conductor A (31), the current limiting resistor (4), the inner conductor B (32) and the coaxial shunt (5) together form a coaxial structure.
7. The pulse small current calibration device according to claim 6, wherein the characteristic impedance of the coaxial structure consisting of the metal cavity (2), the inner conductor A (31), the current limiting resistor (4), the inner conductor B (32) and the coaxial shunt (5) is the same as the characteristic impedance of the output cable of the pulse generator (1).
8. The pulse undercurrent calibration device according to claim 1, characterized in that said current limiting resistor (4) is a high frequency non-inductive rod-shaped ceramic resistor; the frequency response range of the current limiting resistor (4) is determined by the pulse waveform output by the pulse generator (1), and the upper limit of the frequency response is not less than 1/4t of the rising edge (t) of the output pulse.
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Cited By (5)
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| CN107991640A (en) * | 2017-11-27 | 2018-05-04 | 贵州航天计量测试技术研究所 | Discrete Semiconductor Testing System pulse current calibrating installation and calibration method |
| CN109342800A (en) * | 2018-11-29 | 2019-02-15 | 贵州航天计量测试技术研究所 | A kind of calibrating installation and calibration method of pulse plating power pulse current |
| CN109557490A (en) * | 2018-11-16 | 2019-04-02 | 西北核技术研究所 | The caliberating device and method of fast pulse measuring probe are used for based on pulse current source |
| EP3499245A1 (en) * | 2017-12-12 | 2019-06-19 | Siemens Aktiengesellschaft | Assembly with coaxial resistance |
| CN110031789A (en) * | 2019-04-09 | 2019-07-19 | 西北核技术研究所 | The gamut caliberating device and scaling method of high-voltage nanosecond pulse divider scale factor |
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| CN109342800B (en) * | 2018-11-29 | 2023-07-07 | 贵州航天计量测试技术研究所 | Calibrating device and calibrating method for pulse current of pulse electroplating power supply |
| CN110031789A (en) * | 2019-04-09 | 2019-07-19 | 西北核技术研究所 | The gamut caliberating device and scaling method of high-voltage nanosecond pulse divider scale factor |
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