CN106950525A - A kind of pulse low current calibrating installation - Google Patents
A kind of pulse low current calibrating installation Download PDFInfo
- Publication number
- 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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- current
- inner wire
- pulse
- limiting resistance
- calibrating installation
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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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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Testing Relating To Insulation (AREA)
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
It is small more particularly to generation and calibration milliampere or microampere order pulse the present invention relates to high voltage and field of gas discharge
The experimental provision of electric current.
Background technology
Corona discharge is the local self-maintained discharge occurred in inhomogeneous field.Corona discharge is generally by a series of single
Discharge pulse is constituted, and the repetitive rate of discharge pulse is very high；Corona discharge can produce high-frequency pulse current, be a kind of important electromagnetism
Interference source.Corona on power system medium-high voltage transmission lines line conductor can not only cause the electric energy loss of circuit, while can produce
Stronger radio interference and audible noise, the electromagnetic environment on surrounding produce influence.Other high-pressure installations such as motor, transformation
The corona discharge or shelf depreciation of the electrical equipments such as device, gas insulated transformer substation also can be to equipment operation and the life-span produce it is important
Influence.
The high-frequency pulse current that corona discharge is produced has the features such as amplitude is small, pulse is fast, repetition rate is high, single electric discharge arteries and veins
The rising edge of punching is generally several nanoseconds to tens nanoseconds, and pulse width was generally for tens nanoseconds to hundreds of nanoseconds, pulse current
Amplitude is generally microampere to milliampere level.The pulse of corona current and the polarity and other experiments and ring of amplitude characteristic and corona discharge
Border condition is relevant, but due to the unstability of corona discharge, even same experiment condition and environment, the pulse of corona current is special
Property is also not quite similar.Therefore, the calibration of corona current measurement mechanism is most important.
Common corona current measuring method or device mainly have Rogowski coil, sample resistance, coaxial shunt etc..At present
Problem present in corona current or other pulse small current measurements is as follows：Current amplitude is small, and discharge stability is poor, easily by outer
Boundary is disturbed, and electric current is repeated poor；Discharge pulse is fast, requires higher to the high frequency response of measuring system；Measuring method is more,
But due to lacking effective calibration means, measurement data is comparative poor.
The content of the invention
It is an object of the invention to solve to produce the unstable of pulse low current by corona or other discharge types at present
And uncontrollability occurs and calibrating installation there is provided a kind of controllable pulse low current of parameter stability.The pulse low current calibration cartridge
Milliampere to microampere order pulse current, pulse parameter and current amplitude can be produced and can pass through impulse generator and current-limiting resistance control by putting
System, can produce the pulse low current of different parameters, and for the calibration of pulse small current measurement system.
The purpose of the present invention is achieved through the following technical solutions：
A kind of pulse low current calibrating installation, including：Impulse generator, metallic cavity, inner wire A, current-limiting resistance, interior lead
Body 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,
Rogowski coil is sleeved on current-limiting resistance；The inner wire A connections impulse generator, coaxial shunt and Rogowski coil measurement
Current signal is connected by cable with oscillograph.
Further, the metallic cavity is grounded or is connected with the earth terminal of impulse generator.
Further, the metallic cavity includes being fixed with BNC on drive end bearing bracket, main cavity and rear end cap, the drive end bearing bracket
Joint, the inner wire A connects impulse generator by BNC connector；The coaxial shunt includes high-pressure side and BNC connector
End, the high-pressure side connects inner wire B, and the BNC connector end is used to draw the current signal of measurement by cable.
Further, circular hole A is provided with the middle part of the metallic cavity, the cable being connected with the Rogowski coil passes through wire chamber
Circular hole A on body is drawn.
Further, the rear end cap of the metallic cavity is connected by being hinged with main cavity, is provided with the middle of the rear end cap
Circular hole B, the BNC connector for drawing coaxial shunt.
Further, the metallic cavity, inner wire A, current-limiting resistance, inner wire B and coaxial shunt are collectively constituted together
Axle construction, the external diameter of the coaxial configuration is the external diameter of metallic cavity, and the internal diameter of the coaxial configuration is inner wire A's or inner wire B
Diameter.The characteristic for the coaxial configuration that the metallic cavity, inner wire A, current-limiting resistance, inner wire B and coaxial shunt are constituted
Impedance is identical with the characteristic impedance of impulse generator output cable.The inside and outside diameter dimension of the coaxial configuration is decided by that this is same
The characteristic impedance of axle construction.
Further, described impulse generator is the generator of the impulse waveform of exportable Parameter adjustable or pulse electricity
Source, the impulse generator passes through coaxial cable output pulse signal.
Further, the current-limiting resistance is the noninductive rod ceramic resistor of high frequency, its diameter and inner wire A/ inner wires B's
Diameter is same or like；The frequency response range of the current-limiting resistance is decided by the impulse waveform of impulse generator output, its frequency
1/4t of the rate response upper limit not less than output rising edge of a pulse (t).
Further, the impulse generator is connect by being located at the BNC outside metallic cavity on coaxial cable and drive end bearing bracket
One end connection of head, the center conductor that BNC connector is located inside metallic cavity is connected with inner wire A one end, and inner wire A's is another
One end is connected with one end of current-limiting resistance, and the other end of current-limiting resistance is connected with inner wire B one end, the inner wire B other ends with it is same
The high-pressure side of axle current divider is connected, and the BNC connector end of coaxial shunt is used to draw the current signal of measurement by cable.
Beneficial effects of the present invention are：
The pulse current waveform of the invention for producing or calibrating as needed determines the output pulse parameter of impulse generator, by
Current-limiting resistance determines the amplitude of output pulse, and coaxial configuration can avoid reflection during pulse signal transmission, while the external world can be avoided
Interference of the environment to pulse low current.The pulse low current that coaxial shunt and Rogowski coil are used in measuring loop, compares survey
The current waveform of amount and the output pulse signal of impulse generator, can be achieved the calibration to coaxial shunt and Rogowski coil and mark
It is fixed.
Using pulse low current calibrating installation of the present invention, stably and controllable milliampere can be produced to microampere order pulse electricity
Stream, can be achieved the calibration and demarcation of pulse small current measurement device, small for corona discharge, shelf depreciation and other generation pulses
The calibration of current measurement system in the electric discharge of electric current.
Brief description of the drawings
Fig. 1 is the structural representation of pulse low current calibrating installation of the present invention；
Wherein, 1- impulse generators, 2- metallic cavities, 31- inner wires A, 32- inner wire B, 4- current-limiting resistance, 5- is coaxial
Current divider, 6- Rogowski coils.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
A kind of pulse low current calibrating installation, as shown in figure 1, including：Impulse generator 1, metallic cavity 2, inner wire
A31, current-limiting resistance 4, inner wire B32, coaxial shunt 5 and Rogowski coil 6；Wherein,
The inner wire A31, current-limiting resistance 4, inner wire B32 and coaxial shunt 5, which are sequentially connected, is placed in metallic cavity 2
Inside, Rogowski coil 6 is sleeved on current-limiting resistance 4；The inner wire A31 connections impulse generator 1, the He of coaxial shunt 5
The current signal that Rogowski coil 6 is measured is connected by cable with oscillograph.The metallic cavity 2 be grounded or with impulse generator
Earth terminal is connected.The metallic cavity 2, inner wire A31, current-limiting resistance 4, inner wire B32 and coaxial shunt 5 are collectively constituted together
Axle construction.The characteristic impedance of the coaxial configuration is identical with the characteristic impedance of the output cable of impulse generator 1.
The metallic cavity 2 includes being fixed with BNC connector on drive end bearing bracket, main cavity and rear end cap, the drive end bearing bracket, described
Inner wire A31 connects impulse generator 1 by BNC connector；The coaxial shunt 5 includes high-pressure side and BNC connector end, described
High-pressure side connects inner wire B32, and the BNC connector end is used to draw the current signal of measurement by cable.
The metallic cavity 2 is provided with circular hole A, and the cable being connected with the Rogowski coil 6 passes through the circle in metallic cavity 2
Hole A is drawn.
The rear end cap of the metallic cavity 2 is connected by being hinged with main cavity, and circular hole B is provided with the middle of the rear end cap, is used
In the BNC connector for drawing coaxial shunt 5.
The current-limiting resistance 4 is the noninductive rod ceramic resistor of high frequency；The frequency response range of the current-limiting resistance 4 is decided by
The impulse waveform that impulse generator 1 is exported, 1/4t of its frequency response upper limit not less than output rising edge of a pulse (t).
The present embodiment is to calibrate amplitude 10mA, rising edge of a pulse 10ns, pulse width 50ns corona current measurement mechanism
Exemplified by.Impulse generator output rising edge of a pulse 10ns, pulse width 50ns, amplitude 1V voltage pulse, current-limiting resistance is rod
Shape ceramic resistor, the Ω of resistance 100, its frequency response upper limit should be not less than 25MHz.The characteristic impedance of impulse generator output cable
For 50 Ω, then the characteristic impedance for the coaxial configuration that metallic cavity, inner wire, current-limiting resistance and coaxial shunt are constituted is 50 Ω,
Characteristic impedance is related to the inside and outside diameter of coaxial configuration, thus can determine that the diameter of metallic cavity and inner wire, wherein inner wire A
It is identical with inner wire B diameter.
The course of work of the present invention is as follows：Impulse generator is connected to metallic cavity by the coaxial cable of 50 Ω characteristic impedances
The ceramic current-limiting resistance of front end cover B NC joints, inner wire A and 100 Ω rods is connected through a screw thread, and Rogowski coil is sleeved on current limliting electricity
In resistance, coaxial shunt and inner wire B are connected through a screw thread, and inner wire A and metallic cavity front end cover B NC connector center conductors are adopted
Connected with banana plug.After each part in metallic cavity is installed, rear end cap is closed, the BNC connector end of coaxial shunt is from rear
End cap circular hole is drawn, outer conductor and the rear end cap connection of coaxial shunt BNC connector, metallic cavity ground connection.
Impulse generator is adjusted, it is exported rising edge of a pulse 10ns, pulse width 50ns, amplitude 1V voltage pulse,
Rogowski coil and the current signal of coaxial shunt measurement are connected to oscillograph by the coaxial cable of 50 Ω characteristic impedances, pass through
Compare output pulse waveform and Rogowski coil, the current waveform of coaxial shunt measurement of impulse generator, can be achieved to Roche
The calibration of coil, coaxial shunt.
The present invention can produce stably and controllable pulse low current signal, available for pulse small current measurement system in different field
The calibration and demarcation of system.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of pulse low current calibrating installation, it is characterised in that including：Impulse generator (1), metallic cavity (2), inner wire
A (31), current-limiting resistance (4), inner wire B (32), coaxial shunt (5) and Rogowski coil (6)；Wherein,
The inner wire A (31), current-limiting resistance (4), inner wire B (32) and coaxial shunt (5) are sequentially connected and are placed in metal
The inside of cavity (2), Rogowski coil (6) is sleeved on current-limiting resistance (4)；The inner wire A (31) connects impulse generator
(1), coaxial shunt (5) and the current signal of Rogowski coil (6) measurement are connected by cable with oscillograph.
2. pulse low current calibrating installation according to claim 1, it is characterised in that metallic cavity (2) ground connection or
It is connected with the earth terminal of impulse generator.
3. pulse low current calibrating installation according to claim 1, it is characterised in that before the metallic cavity (2) includes
BNC connector is fixed with end cap, main cavity and rear end cap, the drive end bearing bracket, the inner wire A (31) is connected by BNC connector
Impulse generator (1)；The coaxial shunt (5) includes high-pressure side and BNC connector end, the high-pressure side connection inner wire B
(32), the BNC connector end is used to draw the current signal of measurement by cable.
4. pulse low current calibrating installation according to claim 1, it is characterised in that the metallic cavity (2) is provided with
Circular hole A, the cable being connected with the Rogowski coil (6) is drawn by the circular hole A in metallic cavity (2).
5. pulse low current calibrating installation according to claim 3, it is characterised in that the rear end of the metallic cavity (2)
Lid is connected by being hinged with main cavity, and circular hole B is provided with the middle of the rear end cap, and the BNC for drawing coaxial shunt (5) connects
Head.
6. pulse low current calibrating installation according to claim 1, it is characterised in that the metallic cavity (2), inner wire
A (31), current-limiting resistance (4), inner wire B (32) and coaxial shunt (5) collectively constitute coaxial configuration.
7. pulse low current calibrating installation according to claim 6, it is characterised in that the metallic cavity (2), inner wire
The characteristic impedance and pulse for the coaxial configuration that A (31), current-limiting resistance (4), inner wire B (32) and coaxial shunt (5) are constituted
The characteristic impedance of generator (1) output cable is identical.
8. pulse low current calibrating installation according to claim 1, it is characterised in that the current-limiting resistance (4) is high frequency
Noninductive rod ceramic resistor；The frequency response range of the current-limiting resistance (4) is decided by the impulse wave of impulse generator (1) output
Shape, 1/4t of its frequency response upper limit not less than output rising edge of a pulse (t).
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| CN201710159484.8A CN106950525B (en) | 2017-03-17 | 2017-03-17 | A kind of pulse low current calibrating installation |
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| CN201710159484.8A CN106950525B (en) | 2017-03-17 | 2017-03-17 | A kind of pulse low current calibrating installation |
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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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| CN109557490B (en) * | 2018-11-16 | 2020-11-17 | 西北核技术研究所 | Calibration device and method for fast pulse measurement probe based on pulse current source |
| 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 |
| 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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