CN113436856A - Hollow coil sensing complementary device, pincerlike multimeter and preparation method thereof - Google Patents
Hollow coil sensing complementary device, pincerlike multimeter and preparation method thereof Download PDFInfo
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- CN113436856A CN113436856A CN202110652540.8A CN202110652540A CN113436856A CN 113436856 A CN113436856 A CN 113436856A CN 202110652540 A CN202110652540 A CN 202110652540A CN 113436856 A CN113436856 A CN 113436856A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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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
- G01R15/12—Circuits for multi-testers, i.e. multimeters, e.g. for measuring voltage, current, or impedance at will
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
Abstract
The invention discloses a hollow coil sensing complementation device, which comprises two groups of winding coils connected in parallel, wherein each winding coil comprises a special-shaped hollow framework and a hollow coil; the special-shaped hollow framework comprises a first framework thickening part, a middle framework and a second framework thickening part, and the cross section diameters of the first framework thickening part and the second framework thickening part are larger than that of the middle framework; the air-core coil comprises a first interval, a second interval and a third interval, and sensing current signals of the first interval and the third interval are all larger than that of the second interval; also discloses a pincerlike multimeter with an air-core coil sensing complementary device and a preparation method thereof. According to the invention, the structures of the two end parts of the special-shaped hollow framework are improved and designed to be thickened, so that the hollow coil with the corresponding structure is obtained, the voltage intensity of mutual inductance signals of the two end parts is improved, and the problem that the magnetic leakage tangent plane mouth exists in the hollow coil due to the magnetic conduction effect of no iron core, so that a large position error exists at each position in the hollow coil during actual measurement is solved.
Description
Technical Field
The invention relates to the technical field of pincerlike multimeters, in particular to a hollow coil sensing complementary device, a pincerlike multimeter and a manufacturing method thereof.
Background
Because the air-core coil does not contain a magnetic saturation element, the air-core coil has no magnetism, namely, no magnetic core loss, and the inductance value is not influenced by flowing current, so that the response frequency bandwidth of the air-core coil is higher than that of the traditional transformer with the iron core (generally 0.1Hz-1MHz), and the curve of the mutual inductance of the magnetic field is linear, and the air-core coil has the characteristics of low distortion and no saturation. Based on this, in recent years, air-core coils, rogowski coils, korean coils, etc. have been introduced into measuring instrument products one after another, and different kinds of coils have different advantages and disadvantages, respectively:
1) the hollow coil is formed by flat winding of an enameled wire in a hollow core pipe, and has simple manufacturing process and low cost; but the disadvantage is that the measurement position is poor, and the use prompt of a client needs to be guided by increasing the accessory error on the index.
2) The Rogowski coil is characterized in that firstly, an enameled wire is uniformly and flatly wound on an insulated wire tube in the first process, then a shielding layer is wound in the second process, transparent adhesive tape is packaged and fixed in the third process, a fiber tape is additionally wound in the fourth process, and a soft outer sleeve is wrapped in the fifth process to form a closed loop coil; the manufacturing process is complex, the cost is too high (more than 10 times of that of an air-core coil), and the structure is not suitable for a wrenching type clamp meter product
3) The Korean coil is characterized in that firstly, an enameled wire is manufactured into a plurality of single hollow windings, secondly, the single windings are solidified by adopting mixed colloid of soft magnetic powder, polymer and the like, thirdly, a plurality of identical windings are connected, fourthly, the soft outer sleeve is enveloped through the guide connection of a flexible PCB, and finally, the closed loop coil is formed; the manufacturing process is complex, the cost is too high (5 times of the Rogowski coil), and the structure is not suitable for the wrenching type clamp meter product
In the application field of electronics and electricians, the pincerlike multimeter with the wrenching type tong head structure is more convenient for field operation, convenient to move and flexible to be applied to any measurement scene, and more meets the requirements of users on portability and portability; similar to the Rogowski coil or the Korean coil, the coil is a closed loop coil structure, is not suitable for a pull-type clamp meter in operation and is most suitable for being installed in a fixed scene for monitoring;
the difference of the specific point of the air-core coil, the Rogowski coil or the Korean coil from the above points in comparison with the electromagnetic coil or the Hall coil is the design without an iron core; however, because no iron core is used as a magnetic conductor, the magnetic leakage at the tangent plane position is obvious, so that the position deviation of the current transformer is large, and the requirement of uniform distribution of the magnetic field of the transformer on the whole section cannot be met. The coil winding of the annular structure only has one magnetic leakage tangent port, and the coil winding of the pull-type pincerlike meter has 2 magnetic leakage tangent ports, so the magnetic leakage is larger than that of the coil winding of the annular structure; at present, no effective countermeasure aiming at solving the problem exists in the market application scheme, and only a product specification can indicate that the accuracy in measuring the current is based on the center, for example, when a measured current conductor deviates from the center of a clamp head, a position error index of 2% (or a larger percentage value) needs to be added.
Referring to fig. 4, for the conventional air-core coil sensing complementary device, when an alternating current passes through the winding coil, the periphery of the winding coil will present a time-varying magnetic force line, and the varying magnetic force line will generate an induced potential at two ends of the winding coil, and the magnitude of the induced potential will be different according to the distance between the current conductor and the winding coil; according to the sensing principle of the inductance coil, when the current conductor is close to the winding coil in a short distance, the induction potential amplitude is strongest, otherwise, the induction potential is weak when the distance is far; at present, calibration points of all clamp meter products are calibrated by taking an axis center (such as an area A in fig. 4) as basic data, an area B is adjusted by VR1 of an adder input circuit to adjust the balance degree of left and right input signals entering an integrator, but areas C at the top and the bottom of a clamp head cannot be calibrated, a tangent plane magnetic circuit of the device is missed, and voltage signals sensed secondarily are weakest, so that signals transmitted to the integrator circuit are different in size, and therefore, the measurement position difference cannot be avoided.
Disclosure of Invention
In order to overcome the technical problem, the invention discloses an air-core coil sensing complementary device; also disclosed is a pincer-shaped multimeter having an air-core coil sensing complementary device; and discloses a method for manufacturing the pincerlike multimeter with the air-core coil sensing complementary device.
The technical scheme adopted by the invention for realizing the purpose is as follows:
the air-core coil sensing complementation device comprises two groups of winding coils which are connected in parallel, wherein each winding coil comprises a special-shaped air-core framework and an air-core coil wound on the special-shaped air-core framework;
the special-shaped hollow framework comprises a first framework thickening part, a middle framework and a second framework thickening part which are integrally formed, and the cross section diameters of the first framework thickening part and the second framework thickening part are larger than that of the middle framework;
the air core coil comprises a first interval, a second interval and a third interval which are respectively formed by extending according to the shapes of the first framework thickening part, the middle framework and the second framework thickening part, and sensing current signals of the first interval and the third interval are all larger than sensing current signals of the second interval.
The air-core coil sensing complementation device comprises a first coil part, a second coil part and a third coil part which are sequentially arranged in the first section, the second section and the third section, wherein the cross-sectional diameters of the first coil part and the third coil part are larger than that of the second coil part.
In the above air-core coil sensing complementation apparatus, the first region, the second region and the third region of the two sets of air-core coils are respectively communicated to form a first induction region, a second induction region and a third induction region, and the induced electromotive forces of the first induction region, the second induction region and the third induction region are the same.
The air core coil sensing complementation device is characterized in that the ratio of the total length of the first frame thickened part and the second frame thickened part to the length of the middle frame is 17.7%: 82.3 percent.
In the air-core coil sensing complementation device, the first coil part, the second coil part and the third coil part are sequentially connected end to end and are wound clockwise.
The air-core coil sensing complementary device is characterized in that the air-core coil adopts single-layer winding, double-layer winding or N-layer winding.
The air core coil sensing complementary device, wherein the first frame thickening is parallel to the second frame thickening.
A pincer-shaped multimeter with an air-core coil sensing complementary device comprises the air-core coil sensing complementary device;
the pincerlike multimeter further comprises a left tong head and a right tong head, and the two groups of winding coils are fixedly arranged in the left tong head and the right tong head respectively through positioning covers.
The pincerlike multimeter with the air-core coil sensing complementation device further comprises an integrating circuit and an adjustable resistor, wherein the two groups of winding coils are connected in parallel to the integrating circuit, and the adjustable resistor is connected between the integrating circuit and any one group of winding coils.
A method for preparing a pincerlike multimeter with an air-core coil sensing complementary device is used for preparing the pincerlike multimeter with the air-core coil sensing complementary device;
the preparation method comprises the following steps:
and 4, connecting the two groups of winding coils into the integrating circuit in parallel, and connecting an adjustable resistor between the integrating circuit and any one group of winding coils to obtain the pincerlike multimeter with the air-core coil sensing complementary device.
The invention has the following beneficial effects:
(1) according to the characteristics of the sensing sensitivity distribution of the hollow coil, the structure and the section diameter of the hollow coil are changed, and a compensation mode aiming at the tangent plane parts at the top end and the bottom end is adopted, so that the distribution of the magnetic induction signal intensity is adjusted, the magnetic induction intensity complementation in a dense interval of the device is realized, and the position difference defect of current measurement is effectively improved; meanwhile, consideration of actual production is taken into consideration, the production process requirement of framework winding is met, and the high-efficiency capacity of batch production is realized;
(2) based on the structure of a traditional framework, the structure improvement design of two end parts of the traditional framework is thickened to form a first framework thickening part and a second framework thickening part, so that the special-shaped hollow framework with large two ends and small middle is formed, the hollow coil with the corresponding structure is further obtained, the voltage intensity of mutual inductance signals of the two end parts is improved, and the problem that the magnetic leakage tangent plane mouth exists in the hollow coil due to the magnetic conduction effect without an iron core so as to cause large position errors at each position in the hollow coil during actual measurement is solved;
(3) the invention adopts a special winding mode, and the hollow coil is specifically divided into a first coil part, a second coil part and a third coil part, namely three inductors connected in series are formed on the hollow coil; because the cross-sectional diameters of the first coil part and the third coil part are larger than that of the second coil part, the distances between the first coil part and the current conductor to be measured and the distances between the third coil part and the current conductor to be measured are reduced, namely compared with a traditional hollow coil, sensing current signals of the first section and the third section are enhanced; secondly, based on the parallel connection of the two groups of winding coils, the compensation quantity of the sensing current signals of the first sensing area and the third sensing area is increased, so that the induced electromotive forces of the first sensing area, the second sensing area and the third sensing area are the same, and the current sensing readings at all positions in the device are close to consistency;
(4) because the total inductance of the hollow coil is not changed, the sensing sensitivity and the sensing precision of the clamp-on multimeter are complemented only by the change of the cross-sectional areas of the two end parts of the hollow coil, the current sensing reading of current clamps of the clamp-on multimeter in A, B, C areas at different positions is close to consistency, an error adjusting accessory device is not needed to be additionally added, so that the related precision error is added to the clamp head measuring position difference, and the trouble of measuring and calculating by a user is avoided;
(5) the air core coil sensing complementary device can give consideration to the measurement of current in the range of 0.1A-1000A and the frequency response of 40Hz-1KHz, belongs to a current measuring tool with a portable structure, and effectively breaks through the technical difficulty that the position error exists in the measurement of the magnetic leakage tangent plane mouth of a symmetrical or asymmetrical pull-type structure current clamp meter.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic front view of a shaped hollow core skeleton according to the present invention;
FIG. 2 is a schematic cross-sectional view of a pincer-type multimeter having an air-core coil sensing complementary device of the present invention;
FIG. 3 is a schematic diagram of the electrical schematic of a pincer-shaped multimeter having an air-core coil sensing complementary device of the present invention;
fig. 4 is a schematic structural diagram of a conventional air-core coil sensing complementary device.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to facilitate the understanding and appreciation of the technical solutions of the present invention, rather than to limit the invention thereto.
Example (b): referring to fig. 1, the present embodiment provides an air-core coil sensing complementation apparatus, which includes two groups of winding coils connected in parallel, where the winding coils include a special-shaped air-core frame 1 and an air-core coil wound on the special-shaped air-core frame 1;
the special-shaped hollow framework 1 comprises a first framework thickening part 11, a middle framework 12 and a second framework thickening part 13 which are integrally formed, and the cross section diameters of the first framework thickening part 11 and the second framework thickening part 13 are larger than the cross section diameter of the middle framework 12; specifically, the special-shaped hollow-core framework 1 is a plastic framework to prevent a magnetic saturation phenomenon;
the air core coil comprises a first interval, a second interval and a third interval which are respectively formed by extending according to the shapes of the first framework thickening part 11, the middle framework 12 and the second framework thickening part 13, and sensing current signals of the first interval and the third interval are all larger than sensing current signals of the second interval.
Preferably, the air-core coil includes a first coil portion, a second coil portion, and a third coil portion sequentially disposed in the first section, the second section, and the third section, and the cross-sectional diameters of the first coil portion and the third coil portion are larger than the cross-sectional diameter of the second coil portion, so as to effectively shorten the distance between the first coil portion and the current conductor to be measured and the distance between the third coil portion and the current conductor to be measured, that is, compared with a conventional air-core coil, the sensing current signals of the first section and the third section are enhanced.
Furthermore, a first section, a second section and a third section of the two groups of air-core coils are respectively communicated to form a first induction area, a second induction area and a third induction area, and the induced electromotive forces of the first induction area, the second induction area and the third induction area are the same; and the sensing current signal compensation quantity of the first sensing area and the third sensing area is increased based on the parallel connection of the two groups of winding coils, so that the current sensing readings at all positions in the device are ensured to be close to consistency.
In a preferred embodiment, the first carcass reinforcement 11 is parallel to the second carcass reinforcement 13; the proportion of the total length of the first frame thickened part 11 and the second frame thickened part 13 to the length of the middle frame 12 is 17.7%: 82.3%, which contributes to the optimization of the sensing current signals of the first interval and the third interval; specifically, the lengths of the first framework thickening part 11 and the second framework thickening part 13 are both 10mm, and the cross-sectional diameters are both 4.6-4.8 mm; the length of the middle framework 12 is 93.2mm, and the section diameter is 4.0 mm.
Furthermore, the air-core coil adopts single-layer winding, double-layer winding or N-layer winding; the first coil part, the second coil part and the third coil part are sequentially connected end to end and are wound clockwise.
Referring to fig. 2, the present embodiment further discloses a pincerlike multimeter having an air-core coil sensing complementary device, which includes the air-core coil sensing complementary device;
the pincerlike universal meter further comprises a left clamp head 2 and a right clamp head 3, and the two groups of winding coils are fixedly arranged in the left clamp head 2 and the right clamp head 3 respectively by adopting positioning covers so as to avoid the winding coils from moving in the clamp heads; specifically, the two groups of winding coils are bent and formed according to the structures of the left binding clip 2 and the right binding clip 3, so that the first frame thickened part 11 is parallel to the second frame thickened part 13, the compensation amount of the sensing current signals of the first sensing area and the third sensing area is increased, and the same induced electromotive force of the first sensing area, the second sensing area and the third sensing area is ensured.
Referring to fig. 3, preferably, the pincerlike multimeter further includes an integrating circuit and an adjustable resistor, two sets of the winding coils are connected in parallel to the integrating circuit, and the adjustable resistor is connected between the integrating circuit and any one set of the winding coils; specifically, two sets of winding coils all according to end-to-end mode parallel connection in integrator circuit, adjustable resistance (VR1) are used for adjusting the balance degree of B district sensing current, ensure that the offset position error about the pincer-shaped universal meter binding clip is in 0.5% within range, accomplish the calibration of the binding clip signal of preceding process promptly, further improve the sensing precision to overcome "magnetic leakage tangent plane mouth" and measure the defect that there is the position error.
The embodiment discloses a method for manufacturing a pincerlike multimeter with an air-core coil sensing complementary device, which is used for manufacturing the pincerlike multimeter with the air-core coil sensing complementary device;
the preparation method comprises the following steps:
and 4, connecting the two groups of winding coils into the integrating circuit in parallel, and connecting an adjustable resistor between the integrating circuit and any one group of winding coils to obtain the pincerlike multimeter with the air-core coil sensing complementary device.
The clamp-on multimeter with the air-core coil sensing complementation device of the embodiment is subjected to the evaluation of the complementation technology, and the evaluation result is as follows:
note: 1) the current source limitation of the instrument, the frequency response of 1kHz, was not tested.
2) The accuracy of actually measured current frequency response linearity and position difference reading is within 0.5%.
The embodiment has the following advantages:
(1) according to the characteristics of the sensing sensitivity distribution of the hollow coil, the structure and the section diameter of the hollow coil are changed, and a compensation mode aiming at the tangent plane parts at the top end and the bottom end is adopted, so that the distribution of the magnetic induction signal intensity is adjusted, the magnetic induction intensity complementation in a dense interval of the device is realized, and the position difference defect of current measurement is effectively improved; meanwhile, consideration of actual production is taken into consideration, the production process requirement of framework winding is met, and the high-efficiency capacity of batch production is realized;
(2) based on the structure of a traditional framework, the structure improvement design of two end parts of the traditional framework is thickened to form a first framework thickening part and a second framework thickening part, so that the special-shaped hollow framework with large two ends and small middle is formed, the hollow coil with the corresponding structure is further obtained, the voltage intensity of mutual inductance signals of the two end parts is improved, and the problem that the magnetic leakage tangent plane mouth exists in the hollow coil due to the magnetic conduction effect without an iron core so as to cause large position errors at each position in the hollow coil during actual measurement is solved;
(3) the invention adopts a special winding mode, and the hollow coil is specifically divided into a first coil part, a second coil part and a third coil part, namely three inductors connected in series are formed on the hollow coil; because the cross-sectional diameters of the first coil part and the third coil part are larger than that of the second coil part, the distances between the first coil part and the current conductor to be measured and the distances between the third coil part and the current conductor to be measured are reduced, namely compared with a traditional hollow coil, sensing current signals of the first section and the third section are enhanced; secondly, based on the parallel connection of the two groups of winding coils, the compensation quantity of the sensing current signals of the first sensing area and the third sensing area is increased, so that the induced electromotive forces of the first sensing area, the second sensing area and the third sensing area are the same, and the current sensing readings at all positions in the device are close to consistency;
(4) because the total inductance of the hollow coil is not changed, the sensing sensitivity and the sensing precision of the clamp-on multimeter are complemented only by the change of the cross-sectional areas of the two end parts of the hollow coil, the current sensing reading of current clamps of the clamp-on multimeter in A, B, C areas at different positions is close to consistency, an error adjusting accessory device is not needed to be additionally added, so that the related precision error is added to the clamp head measuring position difference, and the trouble of measuring and calculating by a user is avoided;
(5) the air core coil sensing complementary device can give consideration to the measurement of current in the range of 0.1A-1000A and the frequency response of 40Hz-1KHz, belongs to a current measuring tool with a portable structure, and effectively breaks through the technical difficulty that the position error exists in the measurement of the magnetic leakage tangent plane mouth of a symmetrical or asymmetrical pull-type structure current clamp meter.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Those skilled in the art can make many possible variations and modifications to the invention using the above disclosed technical means and teachings, or can modify equivalent embodiments with equivalent variations, without departing from the scope of the invention. Therefore, all equivalent changes made according to the shape, structure and principle of the present invention should be covered by the protection scope of the present invention without departing from the contents of the technical scheme of the present invention.
Claims (10)
1. The air-core coil sensing complementation device is characterized by comprising two groups of winding coils which are connected in parallel, wherein each winding coil comprises a special-shaped air-core framework and an air-core coil wound on the special-shaped air-core framework;
the special-shaped hollow framework comprises a first framework thickening part, a middle framework and a second framework thickening part which are integrally formed, and the cross section diameters of the first framework thickening part and the second framework thickening part are larger than that of the middle framework;
the air core coil comprises a first interval, a second interval and a third interval which are respectively formed by extending according to the shapes of the first framework thickening part, the middle framework and the second framework thickening part, and sensing current signals of the first interval and the third interval are all larger than sensing current signals of the second interval.
2. The apparatus of claim 1, wherein the air-core coil comprises a first coil portion, a second coil portion, and a third coil portion sequentially disposed in the first, second, and third sections, and wherein the first and third coil portions each have a cross-sectional diameter larger than a cross-sectional diameter of the second coil portion.
3. The apparatus according to claim 2, wherein the first, second and third sections of the two sets of air-core coils are connected to form a first sensing area, a second sensing area and a third sensing area, respectively, and the induced electromotive forces of the first, second and third sensing areas are the same.
4. The coreless coil sensing complementary device of claim 3, wherein the first coil portion, the second coil portion, and the third coil portion are connected end to end in sequence and are all wound clockwise.
5. The air-core coil sensing complementary device of claim 4, wherein the air-core coil is a single layer winding, a double layer winding, or an N layer winding.
6. The air core coil sensing complementary device of claim 3, wherein a ratio of a total length of the first and second bobbin thickenings to a length of the middle bobbin is 17.7%: 82.3 percent.
7. The air core coil sensing complementary device of claim 6, wherein the first spine thickening is parallel to the second spine thickening.
8. A pincer-shaped multimeter having an air-coil sensing complementary device, comprising the air-coil sensing complementary device of any one of claims 1-7;
the pincerlike multimeter further comprises a left tong head and a right tong head, and the two groups of winding coils are fixedly arranged in the left tong head and the right tong head respectively through positioning covers.
9. The multimeter of claim 8, further comprising an integration circuit and an adjustable resistor, wherein the two sets of winding coils are connected in parallel to the integration circuit, and wherein the adjustable resistor is connected between the integration circuit and either set of winding coils.
10. A method for manufacturing a pincerlike multimeter having an air-core coil sensing complementary device, the method being used for manufacturing the pincerlike multimeter having an air-core coil sensing complementary device according to claim 9;
the preparation method comprises the following steps:
step 1, limiting the structures and the sizes of the first framework thickened part, the middle framework and the second framework thickened part to obtain the special-shaped hollow framework;
step 2, winding the enameled wire on the special-shaped hollow-core framework from the second framework thickening part to the first framework thickening part in sequence in a clockwise manner to obtain the winding coil with a structure of large two ends and small middle;
step 3, bending and molding the two groups of winding coils according to the structures of the left binding clip and the right binding clip so as to enable the first framework thickening part to be parallel to the second framework thickening part, and fixing the first framework thickening part and the second framework thickening part in the left binding clip and the right binding clip respectively by adopting the positioning covers;
and 4, connecting the two groups of winding coils into the integrating circuit in parallel, and connecting an adjustable resistor between the integrating circuit and any one group of winding coils to obtain the pincerlike multimeter with the air-core coil sensing complementary device.
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| CN104412340A (en) * | 2012-07-13 | 2015-03-11 | Sht有限公司 | Teardrop-shaped magnetic core and coil device using same |
| CN203084013U (en) * | 2013-02-06 | 2013-07-24 | 北京泰派斯特科技发展有限公司 | Current detection calliper |
| CN103383401A (en) * | 2013-07-11 | 2013-11-06 | 优利德科技(中国)有限公司 | External interference compensation method for U-shaped printed circuit board (PCB) coil tong head |
| CN104715912A (en) * | 2015-03-26 | 2015-06-17 | 国网上海市电力公司 | Pincer-shaped resistive current transformer |
| CN105119411A (en) * | 2015-09-10 | 2015-12-02 | 安徽巨一自动化装备有限公司 | AC motor stator winding wiring ring connection structure |
| CN109975591A (en) * | 2019-03-28 | 2019-07-05 | 漳州市玉山电子制造有限公司 | A kind of exchange clip-on multimeter and its coil-winding method |
| CN211125231U (en) * | 2020-01-09 | 2020-07-28 | 深圳市胜斯智能技术有限责任公司 | Open-close type Rogowski coil and current transformer |
| CN215116463U (en) * | 2021-06-11 | 2021-12-10 | 优利德科技(中国)股份有限公司 | Hollow coil sensing complementary device and pincerlike multimeter |
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