CN113092844A - Voltage and current integrated sensing device and clamping sleeve - Google Patents
Voltage and current integrated sensing device and clamping sleeve Download PDFInfo
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- CN113092844A CN113092844A CN202110372804.4A CN202110372804A CN113092844A CN 113092844 A CN113092844 A CN 113092844A CN 202110372804 A CN202110372804 A CN 202110372804A CN 113092844 A CN113092844 A CN 113092844A
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- 238000012360 testing method Methods 0.000 claims abstract description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000003889 eye drop Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 22
- 238000009434 installation Methods 0.000 abstract description 9
- 230000005294 ferromagnetic effect Effects 0.000 abstract description 6
- 239000004020 conductor Substances 0.000 abstract description 5
- 238000009413 insulation Methods 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 12
- 239000003990 capacitor Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000004804 winding Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
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- 230000005291 magnetic effect Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
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Abstract
The application relates to the technical field of voltage sensors, a voltage and current integrated sensing device and cutting ferrule is provided, voltage and current integrated sensing device includes the casing, current sensor, voltage sensor and sensing wire, the casing includes outer loop and inner ring, set up rogowski coil current sensor between outer loop and the inner ring, set up SMD voltage sensor between current sensor and the inner ring, the sensing wire includes current sensing line and voltage sensing line, current sensor is connected to current sensing line one end, the other end is used for connecting check out test set, voltage sensor is connected to voltage sensing line one end, the other end is used for connecting check out test set. The current sensor has the characteristics of simple installation and maintenance, small size and high measurement precision, and the insulation problem between a secondary side and a secondary side does not need to be considered, and the current sensor has wider measurement range than the traditional current sensor and also does not have the ferromagnetic saturation problem. The method is suitable for 10kV insulated conductors and cable terminals, and can realize voltage and current integrated measurement.
Description
Technical Field
The application relates to the technical field of voltage sensors, in particular to a voltage and current integrated sensing device and a clamping sleeve.
Background
In the power system, a sensor is an indispensable device, for example, a voltage sensor is used to detect the voltage of a line under test, and for example, a current sensor is used to detect the current of the line under test. The voltage sensor or the current sensor has the main function of converting high voltage or large current into standard low voltage or standard small current according to proportion, providing the standard low voltage or standard small current for a measuring instrument and a protection device for use, realizing the isolation of a detection equipment line and a high-voltage line and ensuring the safety of human bodies and electrical equipment. In practical application, the voltage sensor or the current sensor is arranged at the detection end of the detection device and is used for being connected with a line to be detected so as to detect the voltage or the current of the line to be detected.
Current sensor generally adopts iron core coil structure, however there is ferromagnetic saturation problem in iron core coil structure, causes the measured value of being surveyed the circuit and check out test set circuit to be non-linear easily to lead to current sensor's acquisition signal distortion, and then cause the great error to appear in measuring result.
The voltage sensor is similar in basic structure to a transformer and includes a primary winding and a secondary winding, both of which are mounted on or wound around an iron core and are insulated from each other and from the iron core, thereby providing electrical isolation between the two windings and from the iron core. In operation, the primary winding of the voltage sensor is connected in parallel to the line under test, and the secondary winding is connected in parallel to the test equipment or relay. However, in recent years, the voltage class requirement is higher and higher, and in order to ensure the insulation between the primary winding and the secondary winding during voltage measurement, the volume of the voltage sensor is designed to be larger and the weight thereof is heavier, so that the installation and maintenance of the voltage sensor are more and more difficult, which is not favorable for large-scale popularization and use.
Disclosure of Invention
In order to solve the technical problem, the voltage and current integrated sensing device and the clamping sleeve suitable for the 10kV insulated wire and cable terminal are provided based on a non-contact voltage measurement theory, and have the advantages of being simple to install and maintain, small in size and high in measurement accuracy.
In order to achieve the above object, a first aspect of the present application provides a voltage-current integrated sensing device, which specifically includes: the device comprises a shell, a current sensor, a voltage sensor and a sensing wire.
The shell comprises an outer ring and an inner ring, the current sensor is arranged between the outer ring and the inner ring and is a Rogowski coil current sensor, the voltage sensor is arranged between the current sensor and the inner ring and is a patch type voltage sensor.
The sensing wire is an insulating core wire and comprises a current sensing wire and a voltage sensing wire, one end of the current sensing wire is connected with the current sensor, the other end of the current sensing wire is used for being connected with detection equipment, one end of the voltage sensing wire is connected with the voltage sensor, and the other end of the voltage sensing wire is used for being connected with the detection equipment.
Further, the shell is composed of two semicircular rings and is divided into an upper shell and a lower shell, the upper shell comprises an upper semicircular ring of an outer ring and an upper semicircular ring of an inner ring, and the lower shell comprises a lower semicircular ring of the outer ring and a lower semicircular ring of the inner ring; the upper semicircular ring of the outer ring is hinged with one end of the lower semicircular ring, and the other end of the upper semicircular ring is connected with the other end of the lower semicircular ring through a fastening device.
Furthermore, the fastening device is a screw nut assembly, and a screw in the screw nut assembly is an eye swing screw.
Further, the shell is made of aluminum materials and is integrally formed.
Further, the voltage sensor is disposed between an inner ring on the lower case and the current sensor.
Further, the lower shell is provided with a first connection hole for the current sensing line and the voltage sensing line to pass through.
Furthermore, the voltage and current integrated sensing device further comprises a coaxial cable, and the coaxial cable wraps the current sensing line and the voltage sensing line.
Further, the thickness of the voltage and current integrated sensing device is 33mm, the transverse diameter of the voltage and current integrated sensing device is 94mm, and the longitudinal diameter of the voltage and current integrated sensing device is 84.5 mm.
Further, voltage electric current integral type sensing device still includes the cutting ferrule, the cutting ferrule is rubber material integrated into one piece, divides into half left side and half right side, half left side with half right side card formula is connected.
The second aspect of the application further provides a clamping sleeve, the clamping sleeve is used for being sleeved on the voltage and current integrated sensing device and comprises a top side and a bottom side, and the diameter of the top side is smaller than that of the bottom side to form an umbrella skirt type structure.
The top side is provided with a second connecting hole, and the diameter of the second connecting hole is the same as that of an inner ring of a shell of the voltage and current integrated sensing device; the bottom side is of an open structure.
The inner side of the clamping sleeve is provided with a buckle for fixing the voltage and current integrated sensing device.
The application provides a voltage and current integral type sensing device and cutting ferrule, has installation, maintains simply, and the volume is less, and measurement accuracy is higher characteristics, still need not to consider the insulating problem between a secondary side, and has the measuring range of broad than traditional current sensor, also does not have ferromagnetic saturation problem. The method is suitable for 10kV insulated conductors and cable terminals, and can realize voltage and current integrated measurement.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a voltage-current integrated sensing device according to an embodiment of the present disclosure;
FIG. 2 is a schematic bottom view of the voltage-current integrated sensing device provided in FIG. 1;
FIG. 3 is a schematic top view of the voltage-current integrated sensing device provided in FIG. 1;
FIG. 4 is a schematic side view of the voltage-current integrated sensing device provided in FIG. 1;
fig. 5 is a schematic mounting diagram of a ferrule provided in an embodiment of the present application;
fig. 6 is a schematic diagram of voltage division of the series capacitors according to the embodiment of the present application.
In the figure: 1-shell, 11-outer ring, 12-inner ring, 13-first connecting end, 131-U-shaped opening, 14-second connecting end, 15-first connecting hole, 141-fastening device, 1411-eye joint screw, 1412-nut, 2-current sensor, 3-voltage sensor, 4-sensing wire, 41-current sensing wire, 42-voltage sensing wire, 5-coaxial cable, 6-ferrule, 61-top side, 611-second connecting hole, 62-bottom side, 100-insulated wire.
Detailed Description
The technical solutions in the embodiments of the present application will be fully and clearly described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a schematic structural diagram of a voltage-current integrated sensor provided in the embodiment of the present application is shown. A first aspect of an embodiment of the present application provides a voltage and current integrated sensing device, including: a housing 1, a current sensor 2, a voltage sensor 3, and a sense line 4.
The shell 1 comprises an outer ring 11 and an inner ring 12, the current sensor 2 is arranged between the outer ring 11 and the inner ring 12, the current sensor 2 is a Rogowski coil current sensor, the voltage sensor 3 is arranged between the current sensor 2 and the inner ring 12, and the voltage sensor 3 is a patch type voltage sensor. In practical operation, the inner ring 12 is configured with different soft rubber pads according to the wire diameters of the wires of different lines to be tested, so that the voltage and current integrated sensing device can be fixed on the line to be tested during installation.
The current sensor 2 in the embodiment of the application adopts the Rogowski coil current sensor, because the Rogowski coil is an annular coil uniformly wound on a non-ferromagnetic material, and the electric signal is converted into a magnetic signal and then is converted into an electric signal, so that the problem of current signal distortion caused by ferromagnetic saturation can be well solved, and the measuring range from a few amperes to thousands of amperes is provided.
The sensing line 4 is an insulating core line and comprises a current sensing line 41 and a voltage sensing line 42, one end of the current sensing line 41 is connected with the current sensor 2, and the other end of the current sensing line 41 is connected with a detection device; one end of the voltage sensing line 42 is connected to the voltage sensor 3, and the other end is used for connecting to a detection device.
Further, in the embodiment of the present application, in order to facilitate installation, the housing 1 is composed of two semicircular rings, and is divided into an upper housing and a lower housing, and the two semicircular rings form the whole housing. The upper shell comprises an upper half ring of the outer ring 11 and an upper half ring of the inner ring 12, and the lower shell comprises a lower half ring of the outer ring 11 and a lower half ring of the inner ring 12. One end of the upper semicircular ring and one end of the lower semicircular ring of the outer ring 11 are connected through a snap nail, and the other end of the upper semicircular ring and the lower semicircular ring are connected through a fastening device 141.
Further, a first connecting end 13 is arranged at the other end of the upper semicircular ring of the outer ring 11, and a U-shaped opening 131 is arranged on the first connecting end 13; a second connecting end 14 is arranged at the other end of the lower semicircular ring of the outer ring 11, the fastening device 141 is arranged at the second connecting end 14, the fastening device 141 is a screw nut assembly, a screw in the screw nut assembly is an eye swing joint screw 1411, the eye swing joint screw 1411 is connected with the second connecting end 14 through a snap-and-snap nail, the diameter of the eye swing joint screw 1411 is smaller than the width of the U-shaped opening 131, and the minimum peripheral width of a nut 1412 in the screw nut assembly is larger than the width of the U-shaped opening 131.
Further, the housing 1 is made of aluminum material and integrally formed, and the aluminum material can play a role in insulation and shielding.
Further, the voltage sensor 3 is disposed between an inner ring 12 on the lower case and the current sensor 2.
Further, the lower housing is provided with a first connection hole 15 for passing the current sensing line 41 and the voltage sensing line 42, and preferably, the first connection hole 15 is located right below the voltage sensor 3.
Further, voltage electric current integral type sensing device still includes coaxial cable 5, coaxial cable 5 parcel current sensing line 41 with voltage sensing line 42, an additional shielded wire is followed first connecting hole 15 is worn out to connect check out test set, just coaxial cable 5 adopts the rubber sleeve to fix.
Further, for a more intuitive and visual understanding of the present application, the embodiment of the present application further provides a bottom view schematic diagram, a top view schematic diagram and a side view schematic diagram of the voltage-current integrated sensing device of fig. 1, and specifically refer to fig. 2, fig. 3 and fig. 4. As can be seen from fig. 2, the thickness of the voltage-current integrated sensing device is 33mm, and a small hole is further formed in the upper left side of the first connection hole 15, and is used for draining water and exhausting air; as can be seen from FIG. 3, the transverse diameter of the voltage-current integrated sensing device is 94 mm; as can be seen from fig. 4, the longitudinal diameter of the voltage-current integrated sensor device is 84.5 mm. Therefore, the embodiment of the application has the advantages of small size, light weight and convenience in installation and maintenance.
Further, voltage electric current integral type sensing device still includes the cutting ferrule, refers to fig. 5, for the installation schematic diagram of the cutting ferrule that this application embodiment provided, cutting ferrule 6 is integrative taking shape for the insulating rubber material for the cover is established on voltage electric current integral type sensing device's casing 1, can prevent that the rainwater gathering from influencing voltage sensor's precision. Cutting ferrule 6 divide into half left side and half right side, half left side and half right side card formula are connected.
In practical application, firstly loosening the nut 1412, rotating the eye screw 1411 out of the U-shaped opening 131, then clamping the voltage and current integrated sensing device at an insulated wire or a 10kV cable joint, and filling the inner ring 12 of the voltage and current integrated sensing device with rubber according to different wire diameters to fix the voltage and current integrated sensing device; then the cutting sleeve 6 is opened along the joint of the left half side and the right half side of the umbrella skirt, sleeved on the shell 1 of the voltage and current integrated sensing device, and the voltage and current integrated sensing device is fixed through a buckle; and finally, fixing the coaxial cable along a lead, and connecting the coaxial cable with detection equipment to perform corresponding monitoring work or relay protection work.
The Rogowski coil sensor is adopted to collect the load current of the line, and the pass band of the Rogowski coil is 1Hz-1MHz, so that the signal of the line to be measured and the output signal have a good linear relation. Simultaneously the Rogowski coil current sensor that this application adopted is applicable to 10kV circuit, and the collection of circuit transient state electric current has the significance to single-phase earth fault diagnosis, and this Rogowski coil current sensor has better transient state collection performance, satisfies modern power system monitoring and relay protection's requirement, follows to Rogowski coil theory of operation:
the current signal i (t) is input into the measured circuit, and the voltage signal is output through the Rogowski coil measuring loop, and the expression of the output voltage signal is as follows:
mu is the vacuum magnetic permeability, n is the number of turns around the Rogowski coil, S is the cross-sectional area, and di (t)/d (t) is the differential of the initial signal current with time.
After the measured signal passes through the integral amplification loop, the R/C integral amplification loop and the filter loop are adopted to obtain:
therefore, the output signal of the Rogowski coil and the initial input signal have a better linear relation, and the upper span and the lower span of the passband of the Rogowski coil are from 1Hz to 1MHz, so that the sensor can well solve the problem of measurement signal distortion caused by ferromagnetic saturation, can realize fault transient measurement and measurement of 1mA to 9000A of load current, and meets the requirements of modern accurate power measurement and relay protection.
Traditional voltage sensor adopts line voltage measurement mode, owing to need solve high-low voltage insulation problem, traditional voltage sensor area is bigger and bigger, installation and maintenance are more and more troublesome, along with non-contact voltage sensor's of recent years maturity is used, non-contact voltage sensor has smallly, simple to operate, and because non-contact voltage sensor does not have the voltage insulation problem of being surveyed line end and check out test set line end, consequently voltage sensor in the embodiment of this application adopts SMD non-contact voltage sensor to measure line voltage.
In the embodiment of the application, the non-contact voltage sensor adopts a series capacitance voltage division principle, and a specific measurement principle is shown in fig. 6. As can be seen from fig. 6, the present application is a double-sided capacitor structure, Ch1 and Ch2 are capacitors to high-voltage insulated conductor capacitors, C2 is a series capacitor, C3 is a measurement loop capacitor, an operational amplifier circuit, and Cg1 and Cg2 are double-sided capacitors to ground stray capacitors, and as can be seen from the above measurement loop, the ratio of the capacitor voltage to the conductor voltage is:
since the stray capacitances Ch1, Ch2, Cg1 and Cg2 are all pf-level units, and C2 is a fixed capacitance of the measurement loop and uf-level, the capacitance division can be quantified by k.
To sum up, voltage sensor adopts non-contact electric capacity voltage division principle in this application embodiment, according to the distributed capacitance of wire to ground and the stray capacitance of wire between to the wire, constructs electric capacity voltage division principle, can reduce stray capacitance to line voltage's measurement influence by a wide margin, and voltage measurement error is about 0.5%, can realize insulated wire and cable terminal voltage monitoring.
The embodiment of the application is active sensing, and the detection equipment can process the acquired data and realize data transmission while providing a power supply for the voltage and current integrated sensing device; meanwhile, the detection equipment is grounded through the grounding lead, so that the whole voltage and current integrated sensing device and the ground keep the same potential.
The second aspect of the embodiment of the present application further provides a ferrule 6, as shown in fig. 5, where the ferrule 6 is configured to be fitted on the housing 1 of the voltage and current integrated sensing device, and includes a top side 61 and a bottom side 62, a diameter of the top side 61 is smaller than a diameter of the bottom side 62, so as to form an umbrella skirt structure, the top side 61 is provided with a second connection hole 611, and a diameter of the second connection hole 611 is the same as a diameter of the inner ring 12 of the housing of the voltage and current integrated sensing device; the bottom side 62 is an open structure.
6 directions of cutting ferrule up can prevent effectively that the rainwater gathering from resulting in voltage sensor's measurement accuracy to receive the influence, and 6 inboard settings of cutting ferrule are used for fixing voltage current integral type sensing device's buckle to prevent voltage current integral type sensing device slips and slips.
According to the technical scheme, the embodiment of the application provides a voltage and current integrated sensing device and a card sleeve, wherein the voltage and current integrated sensing device comprises a shell 1, a current sensor 2, a voltage sensor 3 and a sensing wire 4; the shell 1 comprises an outer ring 11 and an inner ring 12, the current sensor 2 is arranged between the outer ring 11 and the inner ring 12, the current sensor 2 is a rogowski coil current sensor, the voltage sensor 3 is arranged between the current sensor 2 and the inner ring 12, and the voltage sensor 3 is a patch type voltage sensor; the sensing line 4 is an insulating core wire and comprises a current sensing line 41 and a voltage sensing line 42, one end of the current sensing line 41 is connected with the current sensor 2, the other end of the current sensing line is used for connecting a detection device, one end of the voltage sensing line 42 is connected with the voltage sensor 3, and the other end of the voltage sensing line is used for connecting the detection device.
In practical application, the application provides a voltage and current integral type sensing device and cutting ferrule, has installation, maintains simply, and the volume is less, and measurement accuracy is higher characteristics, still need not the insulating problem between sensor primary and secondary side, and has the measuring range of broad than traditional current sensor, also does not have ferromagnetic saturation problem. The method is suitable for 10kV insulated conductors and cable terminals, and can realize voltage and current integrated measurement.
The present application has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.
Claims (10)
1. A voltage-current integrated sensing device, comprising: the device comprises a shell (1), a current sensor (2), a voltage sensor (3) and a sensing wire (4);
the shell (1) comprises an outer ring (11) and an inner ring (12), the current sensor (2) is arranged between the outer ring (11) and the inner ring (12), the current sensor (2) is a Rogowski coil current sensor, the voltage sensor (3) is arranged between the current sensor (2) and the inner ring (12), and the voltage sensor (3) is a patch type voltage sensor;
sensing line (4) are insulating heart yearn, including current sensing line (41) and voltage sensing line (42), current sensing line (41) one end is connected current sensor (2), and the other end is used for connecting check out test set, voltage sensing line (42) one end is connected voltage sensor (3), the other end is used for connecting check out test set.
2. A voltage-current integrated sensing device according to claim 1, wherein the housing (1) is composed of two semi-circular rings, divided into an upper housing and a lower housing, the upper housing comprises an upper semi-circular ring of the outer ring (11) and an upper semi-circular ring of the inner ring (12), the lower housing comprises a lower semi-circular ring of the outer ring (11) and a lower semi-circular ring of the inner ring (12); the upper half ring of the outer ring (11) is hinged with one end of the lower half ring, and the other end of the upper half ring is connected with the other end of the lower half ring through a fastening device (141).
3. A voltage-current integrated sensor device according to claim 2, wherein the fastening means (141) is a screw-nut assembly, and the screw of the screw-nut assembly is an eye-drop screw (1411).
4. A voltage-current integrated sensor device according to claim 2, wherein the housing (1) is made of aluminum and is integrally formed.
5. A voltage-current integrated sensor device according to claim 2, characterized in that the voltage sensor (3) is placed between an inner ring (12) on the lower housing and the current sensor (2).
6. A voltage-current integrated sensing device according to claim 2, wherein the lower housing is provided with a first connection hole (15) for passing the current sensing line (41) and the voltage sensing line (42).
7. A voltage-current integrated sensing device according to claim 1, further comprising a coaxial cable (5), wherein the coaxial cable (5) wraps the current sensing wire (41) and the voltage sensing wire (42).
8. A voltage-current integrated sensing device according to any one of claims 1 to 7, wherein the thickness of the voltage-current integrated sensing device is 33mm, the transverse diameter is 94mm, and the longitudinal diameter is 84.5 mm.
9. The voltage-current integrated sensing device according to claim 8, further comprising a clamping sleeve (6), wherein the clamping sleeve (6) is made of rubber and is divided into a left half and a right half, and the left half is connected with the right half in a clamping manner.
10. A ferrule for fitting over a voltage-current integrated sensor device according to any one of claims 1 to 9, comprising a top side (61) and a bottom side (62), wherein the diameter of the top side (61) is smaller than the diameter of the bottom side (62) to form an umbrella skirt structure;
the top side (61) is provided with a second connecting hole (611), and the diameter of the second connecting hole (611) is the same as that of an inner ring (12) of a shell of the voltage and current integrated sensing device; the bottom side (62) is of an open structure;
the inner side of the clamping sleeve is provided with a buckle for fixing the voltage and current integrated sensing device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110372804.4A CN113092844A (en) | 2021-04-07 | 2021-04-07 | Voltage and current integrated sensing device and clamping sleeve |
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| CN202110372804.4A CN113092844A (en) | 2021-04-07 | 2021-04-07 | Voltage and current integrated sensing device and clamping sleeve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114630572A (en) * | 2022-05-12 | 2022-06-14 | 之江实验室 | Fairing device with quick-release structure |
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| CN204807580U (en) * | 2014-08-19 | 2015-11-25 | 上海宏力达信息技术有限公司 | Sensor is put in cable office |
| CN205246741U (en) * | 2015-11-27 | 2016-05-18 | 云南电网有限责任公司电力科学研究院 | Small electric current signal measurement device of high potential pulse |
| CN106249116A (en) * | 2016-08-31 | 2016-12-21 | 北京兴泰学成仪器有限公司 | High Frequency Current Sensor |
| CN106501586A (en) * | 2016-12-29 | 2017-03-15 | 国家电网公司 | A kind of lightning impulse current sensor and its device based on insulation safety |
| CN108414798A (en) * | 2018-03-08 | 2018-08-17 | 云南电网有限责任公司电力科学研究院 | A kind of current sensor, monitoring system and monitoring method |
| CN209471165U (en) * | 2019-01-11 | 2019-10-08 | 厦门振泰成科技有限公司 | A kind of open-close type residual current transformer |
| CN209542670U (en) * | 2019-01-22 | 2019-10-25 | 中山市腾发电子有限公司 | A kind of ring-type current sensors rubber shell structure |
| CN210665821U (en) * | 2019-09-17 | 2020-06-02 | 无锡创联科技有限公司 | Fixing device of current sensor |
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| CN114630572A (en) * | 2022-05-12 | 2022-06-14 | 之江实验室 | Fairing device with quick-release structure |
| CN114630572B (en) * | 2022-05-12 | 2022-10-21 | 之江实验室 | Fairing device with quick-release structure |
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