CN115436680A - Small-resistance signal resistor for self-integrating Rogowski coil - Google Patents
Small-resistance signal resistor for self-integrating Rogowski coil Download PDFInfo
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- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
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Abstract
The invention relates to a coaxial small-resistance-value resistor, in particular to a small-resistance-value signal resistor for a self-integrating Rogowski coil, and solves the technical problems of complex structure and high cost of the conventional signal resistor. The small-resistance signal resistor for the self-integrating Rogowski coil is characterized in that: the chip resistor chip comprises a first connector, a transfer flange, a connecting assembly, an inner core, N chip resistors and a second connector, wherein N is more than or equal to 2; one end of the connecting component is connected with the first connector, and the other end of the connecting component is connected with the second connector; one end of the adapter flange is coaxially connected with the first connector, and the other end of the adapter flange is sleeved on the inner wall of the second connector; the inner core is sleeved on the connecting component; the other end of the inner core, the adapter flange and the second connector form an accommodating cavity; the N chip resistors are uniformly arranged in the accommodating cavity along the circumference; the signal resistor has small volume and can meet the requirement of a Rogowski coil in a large pulse power device.
Description
Technical Field
The invention relates to a coaxial small-resistance-value resistor, in particular to a small-resistance-value signal resistor for a self-integrating Rogowski coil.
Background
With the continuous development and wide application of pulse power technology, it is a very important task to accurately measure the pulse large current. In pulse power devices, pulse currents of the order of hundred kA are measured, often using rogowski coil current probes. The rogowski coil can be divided into a self-integration type and an external integration type according to an integration method, and a self-integration type rogowski coil is often used for a pulsed large current having a pulse width of several hundreds ns or less. The self-integration rogowski coil generally uses a coaxial small-resistance resistor as a signal resistor, and can be divided into two types according to the using mode: one is a dedicated signal resistor fixed together with the rogowski coil, and is often used for a rogowski coil that can move freely. The other type is a universal signal resistor which can be matched with different Rogowski coils and is mainly used for the Rogowski coil fixed on the pulse power device. The magnitude of the signal resistance directly affects the magnitude of the output signal of the Rogowski coil, and the magnitude of the output signal of the Rogowski coil and the output signal of the Rogowski coil are generally in direct proportion. In the measurement of hundred kA-level pulse current, because the amplitude of the current to be measured is large, in order to avoid the insulation failure of a rogowski coil port or the damage of a measurement loop unit element (including but not limited to a signal resistor, an attenuator, an oscilloscope and the like), the resistance value of the signal resistor is generally several ohms or even below 1 Ω. The signal resistor has inductance, which will affect the output of the rogowski coil. Under the same inductance, the smaller the resistance value of the signal resistor, the greater the influence of the inductance, and therefore, the influence of the inductance needs to be reduced as much as possible. Generally, the inductance is reduced by using a method of reducing inductance, and the following three schemes are generally adopted: firstly, a plurality of small resistors are connected in parallel to reduce inductance; secondly, the inductance is reduced by a method of enabling the structure of the signal resistor to be more compact; and thirdly, directly using a coaxial type resistor.
In the prior art, chinese patent CN104502664A discloses "low-resistance value non-inductive self-integrating rogowski coil integral resistor and a manufacturing method thereof", and introduces a signal resistor which uses a cylindrical metal support to manufacture a loop device, and uses a compact structure to reduce inductance. Chinese patent CN106154013B discloses a "composite rogowski coil integrating resistor and its manufacturing method", which introduces a signal resistor formed by combining an external integrating resistor, a self-integrating resistor, and an integrating capacitor, and adopts a compact structure to reduce inductance, and simultaneously uses a capacitance compensation mode to reduce inductance influence. A chinese patent of the chinese naval industry systems engineering research institute, publication number CN113917214A, discloses a self-integrating rogowski coil disk-shaped integral resistor and a manufacturing method thereof, which utilizes a disk-shaped PCB board and a plurality of chip resistors arranged on the PCB board in a radial annular arrangement to manufacture a signal resistor, and reduces inductance by connecting the plurality of resistors in parallel. Another chinese patent publication No. CN212341315U discloses a "coaxial disc-shaped water resistor for self-integrating rogowski coil", which uses two stainless steel pipes inside and outside as two electrodes and fills electrolyte to make a disc-shaped signal resistor for self-integrating rogowski coil, and adopts a method of making a coaxial resistor to reduce inductance. The four signal resistors described in the above documents are only suitable for a specific reflow structure. An article "a coaxial non-inductive resistor with a compact structure" published by the national defense science and technology university in "electronic components and materials", 1997, 16 (5) uses a large number of stainless steel cylinders to make a compact signal resistor, and adopts a plurality of small resistors connected in parallel and a compact structure to reduce inductance. In the 'strong laser and particle beam' published by the national defense science and technology university, 2009, 21 (10) 'response of Rogowski coil signal resistance to nanosecond pulse large current' an inductance is reduced by connecting 50 metal film resistors in parallel. The two types introduced in the national defense science and technology university data are all universal signal resistors.
For a large pulse power device, tens of hundreds of rogowski coils may be installed, so that a large number of signal resistors need to be prepared at the same time, but the number of the signal resistors does not reach the level of reducing the cost through batch production, and a signal resistor support with a simple structure and low cost is needed. In addition, in a large pulse power device, the peripheral structures of the rogowski coils are different, and the space for installing the signal resistor is limited, so that the radial size of the signal resistor is required to be as small as possible to adapt to more rogowski coil structures. Of the two general signal resistors, the coaxial non-inductive resistor with a compact structure has the smallest radial size, but has a complex structure, a long manufacturing period and higher cost; the radial size of the signal resistor introduced in the 'response of the Rogowski coil signal resistor to nanosecond pulse large current' is large, and the signal resistor is not beneficial to installation in some narrow spaces.
Disclosure of Invention
The invention aims to solve the technical problems of complex structure and high cost of the existing signal resistor, and provides a small-resistance signal resistor for a self-integrating Rogowski coil.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a small-resistance signal resistor for a self-integrating Rogowski coil is characterized in that: the chip resistor chip comprises a first connector, a transfer flange, a connecting assembly, an inner core, N chip resistors and a second connector, wherein N is more than or equal to 2;
one end of the connecting component is connected with a first inner needle of the first connector, and the other end of the connecting component is connected with a second inner needle of the second connector;
one end of the adapter flange is coaxially connected with the first connector, and the other end of the adapter flange is sleeved on the inner wall of the second connector;
the inner core is sleeved on the connecting component; the first inner needle of the first connector at one end of the inner core is connected, and the other end of the inner core, the adapter flange and the second connector form an accommodating cavity;
the N chip resistors are uniformly arranged in the accommodating cavity along the circumference, and two ends of each chip resistor are respectively connected with the outer side wall of the inner core and the inner side wall of the adapter flange;
the first connector is used for being connected with an output port of the self-integrating Rogowski coil, and the second connector is used for being connected with an oscilloscope; or the first connector is used for connecting with the oscilloscope, and the second connector is used for connecting with the output port of the self-integrating Rogowski coil.
Further, the inner core is of a cylindrical structure; a plurality of blind grooves matched with one end of the chip resistor are formed in the outer side wall of the inner core;
an annular step is arranged on the inner wall of the adapter flange corresponding to the other end of the chip resistor;
one end of the chip resistor is positioned in the blind groove and is connected with the bottom of the blind groove; the other end of the chip resistor is positioned on the annular step and connected with the inner wall of the annular step.
Further, the value of N is 6.
Further, the connecting component is a connecting rod;
the first connector is an N-50KF connector;
the second connector is an N-J connector.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
(1) The invention relates to a small-resistance signal resistor for a self-integrating Rogowski coil, which adopts a first connector, a transfer flange, a connecting assembly, an inner core, N chip resistors and a second connector, wherein a first inner pin of the first connector is connected with a second inner pin of the second connector through the connecting assembly, and the inner core is sleeved on the connecting assembly, so that the signal resistor has the advantages of small volume, simple and compact structure and high bandwidth upper limit. The two connectors are connected through the adapter flange, so that the external electromagnetic interference shielding effect is achieved, and the requirement for the self-integration Rogowski coil in a large-scale pulse power device can be met.
(2) The small-resistance signal resistor for the self-integrating Rogowski coil is uniformly distributed in the accommodating cavity formed by the inner core, the adapter flange and the second connector, so that the component structure of the signal resistor is simplified and the manufacturing process difficulty is reduced on the premise of ensuring small volume and high power.
(3) The invention is used for the small-resistance signal resistor of the self-integration Rogowski coil, and can also use the common components sold in the market, so that the overall cost is low, and the batch production is easier.
Drawings
Fig. 1 is a schematic structural diagram of a small-resistance signal resistor for a self-integrating rogowski coil according to the present invention.
Fig. 2 is a schematic view of an installation structure of a chip resistor inside an adapter flange in an embodiment of a small-resistance signal resistor for a self-integrating rogowski coil according to the present invention.
Fig. 3 is a schematic diagram of the working process of the embodiment of the small-resistance signal resistor for the self-integrating rogowski coil of the present invention, in which i (t) is the induced current in the self-integrating rogowski coil, and V (t) is the voltage signal.
The reference numbers in the figures are:
the device comprises a first connector 1, a first inner pin 11, a transfer flange 2, a connecting assembly 3, an inner core 4, a chip resistor 5, a second connector 6, a second inner pin 61, a self-integrating Rogowski coil 7, an output end connector 8, a signal transmission cable 9 and an oscilloscope 10.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art without creative efforts based on the technical solutions of the present invention belong to the protection scope of the present invention.
As shown in fig. 1, a small-resistance signal resistor for a self-integrating rogowski coil includes a first connector 1, a transfer flange 2, a connecting assembly 3 (connecting rod), an inner core 4, N chip resistors 5, and a second connector 6, where N is greater than or equal to 2.
One end of the connecting component 3 is connected with the first inner needle 11 of the first connector 1, and the other end of the connecting component 3 is connected with the second inner needle 61 of the second connector 6; one end of the adapter flange 2 is coaxially connected with the first connector 1, and the other end is sleeved on the inner wall of the second connector 6; one end of the adapter flange 2 is connected with the first connector 1 through a screw, the other end of the adapter flange is connected with the second connector 6 through a screw thread, and the adapter flange 2, the first connector 1 and the second connector 6 jointly form a shell of the signal resistor, so that the signal resistor plays a role in shielding external electromagnetic interference.
The inner core 4 is sleeved on the connecting component 3; one end of the inner core 4 is connected with the first inner needle 11 of the first connector 1, and the other end of the inner core 4, the adapter flange 2 and the second connector 6 form an accommodating cavity;
The first connector 1 is used for being connected with an output port of the self-integrating Rogowski coil 7, and the second connector 6 is used for being connected with an oscilloscope 10; alternatively, the first connector 1 is used for connecting with the oscilloscope 10, and the second connector 6 is used for connecting with the output port of the self-integrating rogowski coil 7.
In this embodiment, the inner core 4 is preferably a cylindrical structure; the outer side wall of the inner core 4 is provided with a plurality of blind grooves matched with one ends of the chip resistors 5, and the blind grooves are used for clamping electrodes. An annular step is arranged on the inner wall of the adapter flange 2 corresponding to the other end of the chip resistor 5; one end of the chip resistor 5 is positioned in the blind groove and is connected with the bottom of the blind groove; the other end of the chip resistor 5 is positioned on the annular step and connected with the inner wall of the annular step. Wherein the value of N is 6, the blind grooves are rectangular grooves, and the number of the blind grooves is 6; the 6 chip resistors 5 are respectively and uniformly arranged between the inner core 4 and the adapter flange 2. The connecting component 3 is a connecting rod; the first connector 1 is an N-50KF connector; the second connector 6 is an N-J connector.
Firstly, welding the connecting rod to the inner needle connected with the N-50KF, sleeving the inner core 4 outside the connecting rod, connecting one end of the inner core 4 to the inner needle of the N-50KF connector, and connecting the inner core 4 and the connecting rod through tin soldering.
The adaptor flange 2 is then screwed to the N-50KF connector.
As shown in fig. 2, 6 chip resistors 5 are symmetrically and laterally placed between the inner core 4 and the adaptor flange 2, one end of each chip resistor 5 is placed in a blind groove at the top of the inner core 4, the other end of each chip resistor 5 is placed on a step on the adaptor flange 2 for supporting the chip resistor 5, and electrodes at two ends of each chip resistor 5 are respectively welded with the inner core 4 and the adaptor flange 2.
Then, the inner needle of the N-J connector is removed from the N-J connector and welded with the connecting rod.
And finally, connecting the N-J connector with the adapter flange 2 through threads to complete the assembly of the small-resistance signal resistor for the self-integrating Rogowski coil.
The signal resistor comprises an N-50KF connector, a transfer flange 2, a connecting rod, an inner core 4, 6 chip resistors 5 and an N-J connector. The inner needles of the two connectors are connected through a connecting rod, and the inner core 4 is sleeved and welded on the connecting rod. The shells of the two connectors are connected through the adapter flange 2, and the function of shielding external electromagnetic interference is achieved. The chip resistors 5 are symmetrically distributed between the inner core 4 and the outer shell, so that the signal resistor has the advantages of small volume, simple structure, low cost, high bandwidth upper limit and the like.
The working process of the above embodiment is as follows:
as shown in fig. 3, the signal resistor of the present invention is connected to the output port of the output terminal connector 8 of the self-integrating rogowski coil 7, and the port of the signal resistor connected to the output port of the output terminal connector 8 connected to the self-integrating rogowski coil 7 is referred to as the input port of the signal resistor, and the other end is referred to as the output port of the signal resistor.
The signal resistor in the present invention has no direction, and both the first connector 1 and the second connector 6 can be used as input ports. In other embodiments, the output terminal connector 8 is not necessarily an N-type connector, and the connection with the signal resistor may use other connectors as relays. The self-integrating Rogowski coil 7 and the signal resistor of the invention form a complete current measuring probe, and the parameters of the probe, such as sensitivity, leading edge response and the like, are closely related to the resistance value R of the signal resistor.
Assuming that the current I (t) to be measured is to be measured using the current measuring probe described above, and the induced current in the self-integrating rogowski coil 7 is I (t), when I (t) flows through the signal resistor, a voltage signal V (t) is generated on the signal resistor, and V (t) = I (t) · R.
The voltage signal V (t) is transmitted to the oscilloscope 10 through the signal transmission cable 9, and recorded by the oscilloscope 10. The voltage signal V (t) is in direct proportion to the current I (t) to be measured, and the amplitude of the current I (t) to be measured can be deduced by measuring the amplitude of the voltage signal V (t).
Claims (4)
1. A small resistance signal resistor for a self-integrating rogowski coil, the resistor comprising: the chip resistor connector comprises a first connector (1), a transfer flange (2), a connecting assembly (3), an inner core (4), N chip resistors (5) and a second connector (6), wherein N is more than or equal to 2;
one end of the connecting component (3) is connected with a first inner needle (11) of the first connector (1), and the other end of the connecting component (3) is connected with a second inner needle (61) of the second connector (6);
one end of the adapter flange (2) is coaxially connected with the first connector (1), and the other end of the adapter flange is sleeved on the inner wall of the second connector (6);
the inner core (4) is sleeved on the connecting component (3); one end of the inner core (4) is connected with the first inner needle (11) of the first connector (1), and the other end of the inner core (4) forms an accommodating cavity with the adapter flange (2) and the second connector (6);
the N chip resistors (5) are uniformly arranged in the accommodating cavity along the circumference, and two ends of each chip resistor (5) are respectively connected with the outer side wall of the inner core (4) and the inner side wall of the adapter flange (2);
the first connector (1) is used for being connected with an output port of the self-integrating Rogowski coil (7), and the second connector (6) is used for being connected with an oscilloscope (10); or the first connector (1) is used for being connected with an oscilloscope (10), and the second connector (6) is used for being connected with an output port of the self-integrating Rogowski coil (7).
2. A small resistance signal resistor for a self-integrating rogowski coil in accordance with claim 1, wherein:
the inner core (4) is of a cylindrical structure; a plurality of blind grooves matched with one end of the chip resistor (5) are formed in the outer side wall of the inner core (4);
an annular step is arranged on the inner wall of the adapter flange (2) corresponding to the other end of the chip resistor (5);
one end of the chip resistor (5) is positioned in the blind groove and is connected with the bottom of the blind groove; the other end of the chip resistor (5) is positioned on the annular step and connected with the inner wall of the annular step.
3. A small resistance signal resistor for a self-integrating rogowski coil in accordance with claim 4, wherein: the value of N is 6.
4. A small-resistance signal resistor for a self-integrating rogowski coil according to any one of claims 1-3, wherein:
the connecting component (3) is a connecting rod;
the first connector (1) is an N-50KF connector;
the second connector (6) is an N-J connector.
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| CN202211220210.2A CN115436680B (en) | 2022-09-30 | 2022-09-30 | Small-resistance signal resistor for self-integration rogowski coil |
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| CN115436680B CN115436680B (en) | 2024-08-16 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6614218B1 (en) * | 1998-04-22 | 2003-09-02 | Power Electronic Measurements Limited | Current measuring device |
| KR101476819B1 (en) * | 2013-10-28 | 2014-12-29 | (주) 트랜스온 | Current sensing device using rogowski coil |
| CN104459276A (en) * | 2014-11-28 | 2015-03-25 | 西安电子工程研究所 | Rogowski coil for measuring nanosecond pulse current |
| CN104502664A (en) * | 2014-11-14 | 2015-04-08 | 西安交通大学 | Low-resistance non-inductive self-integration Rogowski coil integration resistor and manufacturing method thereof |
| JP2016014689A (en) * | 2015-10-28 | 2016-01-28 | 一般財団法人電力中央研究所 | Impulse current detection device |
| CN106154013A (en) * | 2016-06-17 | 2016-11-23 | 西安交通大学 | A kind of compound Luo-coil integrating resistor and manufacture method thereof |
| JP2019020369A (en) * | 2017-07-21 | 2019-02-07 | 日置電機株式会社 | Current sensor and measurement device |
| CN113917214A (en) * | 2021-09-22 | 2022-01-11 | 中国船舶工业系统工程研究院 | Self-integration Rogowski coil disc-shaped integral resistor and manufacturing method thereof |
-
2022
- 2022-09-30 CN CN202211220210.2A patent/CN115436680B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6614218B1 (en) * | 1998-04-22 | 2003-09-02 | Power Electronic Measurements Limited | Current measuring device |
| KR101476819B1 (en) * | 2013-10-28 | 2014-12-29 | (주) 트랜스온 | Current sensing device using rogowski coil |
| CN104502664A (en) * | 2014-11-14 | 2015-04-08 | 西安交通大学 | Low-resistance non-inductive self-integration Rogowski coil integration resistor and manufacturing method thereof |
| CN104459276A (en) * | 2014-11-28 | 2015-03-25 | 西安电子工程研究所 | Rogowski coil for measuring nanosecond pulse current |
| JP2016014689A (en) * | 2015-10-28 | 2016-01-28 | 一般財団法人電力中央研究所 | Impulse current detection device |
| CN106154013A (en) * | 2016-06-17 | 2016-11-23 | 西安交通大学 | A kind of compound Luo-coil integrating resistor and manufacture method thereof |
| JP2019020369A (en) * | 2017-07-21 | 2019-02-07 | 日置電機株式会社 | Current sensor and measurement device |
| CN113917214A (en) * | 2021-09-22 | 2022-01-11 | 中国船舶工业系统工程研究院 | Self-integration Rogowski coil disc-shaped integral resistor and manufacturing method thereof |
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