CN210376565U - Overhead line current acquisition device and fault indicator - Google Patents
Overhead line current acquisition device and fault indicator Download PDFInfo
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- CN210376565U CN210376565U CN201921201840.9U CN201921201840U CN210376565U CN 210376565 U CN210376565 U CN 210376565U CN 201921201840 U CN201921201840 U CN 201921201840U CN 210376565 U CN210376565 U CN 210376565U
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Abstract
The embodiment of the utility model provides an overhead line current collection system and fault indicator relates to fault indicator technical field. The acquisition device comprises a movable plate, a first upright post, a second upright post, a U-shaped block, a Rogowski coil and a sampling circuit. Two ends of the movable plate are respectively connected with the top ends of the first upright post and the second upright post in the vertical direction; the Rogowski coil is arranged at the central parts of the movable plate, the first upright post, the second upright post and the U-shaped block and is used for forming a closed loop; the sampling circuit comprises a first amplifying circuit connected with the positive output end and the negative output end of the Rogowski coil and a second amplifying circuit connected with the output end of the first amplifying circuit, and the output end of the second amplifying circuit is electrically connected with an A/D interface of the control module. Load current is collected by the Rogowski coil, and then the load current is sent to the A/D interface through the two amplifying circuits to be judged by the control module, so that the linearity of the whole measuring process is good, no saturation dead zone exists, and the current measuring precision is more accurate.
Description
Technical Field
The utility model relates to a fault indicator technical field particularly, relates to an overhead line current collection system and fault indicator.
Background
With the increasing living standard of people, the demand of electric power is higher and higher. And the distribution network is usually longer in line, various in load type, complex in topological structure and large in maintenance workload. Once a line has a fault, the fault indicator has the main functions of quickly locating a fault point after the fault occurs, informing operation and maintenance personnel to arrive at the site at the first time, eliminating the fault and recovering power supply, reducing the power failure time and improving the power supply reliability.
At present, the current acquisition part of the fault indicator produced by main manufacturers on the market is generally composed of two movable plates made of iron and a coil, the current acquisition precision is poor, and fault type judgment is easy to cause.
SUMMERY OF THE UTILITY MODEL
In view of this, an object of the embodiments of the present invention is to provide an overhead line current collection device and a fault indicator, so as to improve the problem of poor current collection precision of the fault indicator in the prior art.
The embodiment of the utility model provides an overhead line current collection device, including movable plate, relative first stand and second stand, connect first stand with the U type piece of second stand, rogowski coil and with the sampling circuit of rogowski coil electric connection of second stand; two ends of the movable plate are respectively connected with the top ends of the first upright post and the second upright post in the vertical direction; the Rogowski coil is arranged at the central parts of the movable plate, the first upright post, the second upright post and the U-shaped block and used for forming a closed loop; the sampling circuit comprises a first amplifying circuit connected with the positive output end and the negative output end of the Rogowski coil and a second amplifying circuit connected with the output end of the first amplifying circuit, and the output end of the second amplifying circuit is electrically connected with an A/D interface of the control module.
As a further optimization, the first amplifying circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor and a first amplifier;
the first end of the first resistor is connected with the negative output end of the Rogowski coil, and the second end of the first resistor is connected with the inverting input end of the first amplifier; the first end of the second resistor is connected with the positive output end of the Rogowski coil, and the second end of the second resistor is connected with the homodromous input end of the first amplifier; the first end of the third resistor is connected with the second end of the first resistor, and the second end of the third resistor is connected with the output end of the first amplifier; the first end of the first capacitor is connected with the second end of the first resistor, and the second end of the first capacitor is connected with the output end of the first amplifier.
As a further optimization, the second amplifying circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor and a second amplifier;
a first end of the fourth resistor is connected with the output end of the first amplifier, and a second end of the fourth resistor is connected with the inverting input end of the second amplifier; a first end of the fifth resistor is connected with a reference voltage, and a second end of the fifth resistor is connected with a homodromous input end of the second amplifier; a first end of the sixth resistor is connected with a second end of the fourth resistor, and a second end of the sixth resistor is connected with an output end of the second amplifier; a first end of the second capacitor is connected with a second end of the fourth resistor, and a second end of the second capacitor is connected with an output end of the second amplifier; the output end of the second amplifier is connected with the first end of the seventh resistor, and the second end of the seventh resistor is used for being electrically connected with the A/D interface of the control module.
The embodiment of the utility model provides an overhead line fault indicator is still provided, include: the device comprises a power supply device, a wireless transmission module, a control module, an indicating device for indicating the fault type and the current collecting device; the current acquisition device, the control module, the wireless transmission module and the indicating device are electrically connected with the power supply device; the current acquisition device and the indicating device are both connected with the control module; and the control module is connected with the master station system through the wireless transmission module.
As further optimization, the power supply device comprises a permalloy, a rectifying module, a protection module and a booster circuit module which are sequentially connected; the permalloy is installed inside the movable plate, the first upright post, the second upright post and the U-shaped block to form a closed loop, and the output end of the booster circuit module is connected with the current collecting device, the control module and the wireless transmission module respectively.
As a further optimization, the wireless transmission module is a GPRS module or a 2G/3G/4G module.
As a further optimization, the chip model of the control module is Msp430fr 5949.
As a further optimization, the indicating device comprises a transparent lampshade arranged below the fault indicator in the vertical direction and an LED indicating lamp arranged inside the transparent lampshade, and the antenna of the wireless transmission module extends in the vertical direction and extends into the lampshade.
The utility model has the advantages as follows:
the utility model discloses an overhead line current collection system sets up the rogowski coil through the inside at movable plate, first stand, second stand and U type piece to form the closed loop of rogowski coil and carry out load current's collection. Then the load current is sent to the control module through the two amplifying circuits and then sent to the A/D interface for judgment, the linearity of the whole measurement process is good, and no saturation dead zone exists. Compared with the sampling and measurement of the iron movable plate and the coil in the prior art, the method has the advantages that the load current measurement precision is more accurate and can reach 1%.
In addition, the utility model discloses a fault indicator still adopts permalloy to get the electricity, then produces the required operating voltage of fault indicator through rectifier module, protection module and boost circuit module, shortens the charge time, makes the fault indicator complete machine get into full function mode fast under the condition that does not have the battery, does not need extra power.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of a sampling circuit of an overhead line current collection device according to a first embodiment of the present invention;
fig. 2 is a schematic structural view of an overhead line current collection device according to a first embodiment of the present invention;
fig. 3 is a topological structure diagram of an overhead line fault indicator according to a second embodiment of the present invention;
fig. 4 is a topology structural view of a power supply device of an overhead line fault indicator according to a second embodiment of the present invention;
fig. 5 is a structural diagram of an overhead line fault indicator according to a second embodiment of the present invention.
Icon: 1-a collecting device; 10-rogowski coils; 11-a movable plate; 12-a first upright; 13-a second upright; 14-U-shaped blocks; 15-movable plate pressure spring; 16-a wire compression spring; 17-a compression spring steel shaft; 18-U-shaped rubber mats; 20-a first amplification circuit; 30-a second amplifying circuit; 2-a control module; 3-an indication device; 31-a lamp shade; 32-LED indicator lights; 4-a wireless transmission module; 41-an antenna; 5-a power supply device; 51-permalloy; 52-a rectification module; 53-a protection module; 54-a boost circuit module; 6-main body part.
Detailed Description
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
In the embodiments, the references to "first \ second" are merely to distinguish similar objects and do not represent a specific ordering for the objects, and it is to be understood that "first \ second" may be interchanged with a specific order or sequence, where permitted. It should be understood that "first \ second" distinct objects may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced in sequences other than those illustrated or described herein.
Referring to fig. 1 to 2, a first embodiment of the present invention provides an overhead line current collecting device, which includes a movable plate 11, a first upright 12 and a second upright 13 disposed opposite to each other, a U-shaped block 14 connecting the first upright 12 and the second upright 13, a rogowski coil 10, and a sampling circuit electrically connected to the rogowski coil 10. Two ends of the movable plate 11 are respectively connected with the top ends of the first vertical column 12 and the second vertical column 13 in the vertical direction; the rogowski coil 10 is installed at the center of the moving plate 11, the first leg 12, the second leg 13 and the U-shaped block 14 to form a closed loop. Referring to fig. 1, the sampling circuit includes a first amplifying circuit 20 connected to the positive output end and the negative output end of the rogowski coil 10, and a second amplifying circuit 30 connected to the output end of the first amplifying circuit 20, wherein the output end of the second amplifying circuit 30 is used for being electrically connected to the a/D interface of the control module 2.
Specifically, in the present embodiment, as shown in fig. 2, the movable plate 11 has an arc structure, one end of which is hinged to the first column 12 through a long rotation shaft, and the other end of which is attached to the second column 13, and then the movable plate 11 and the second column 13 are connected more tightly through the movable plate compression spring 15 hinged to the first column 12, so that the wire is more firmly clamped, and the fault indicator is not easily detached from the cable. The first upright 12 and the second upright 13 are respectively connected with two ends of a U-shaped block 14 through screws, and the U-shaped block 14 is positioned below the movable plate 11 in the vertical direction. Thus, the movable plate 11, the first upright 12, the second upright 13 and the U-shaped block 14 surround a circular cavity formed, which is more adapted to the shape of the cable, and is more favorable for better inducing load current by the rogowski coil 10 disposed at the central portion of the movable plate 11, the first upright 12, the second upright 13 and the U-shaped block 14. Besides, the first upright post 12 and the second upright post 13 are hinged with a lead pressure spring 16 extending along the direction of the U-shaped block 14. Two arms of the lead pressure spring 16 are connected to two ends of a pressure spring steel shaft 17 which transversely penetrates through the first stand column 12 and the second stand column 13, so that the lead pressure spring 16 is hinged to the first stand column 12 and the second stand column 13, and due to the elastic acting force of the lead pressure spring 16, pressure can be applied to a cable which is located on the U-shaped block 14, so that the problem of virtual connection between the acquisition device 1 and the cable is reduced, and the current acquisition precision is further improved.
As a further optimization, referring to fig. 2, a U-shaped rubber pad 18 adapted to the U-shaped groove is further disposed in the U-shaped groove of the U-shaped block 14, so as to increase the friction between the cable and the U-shaped block 14 and prevent the cable from sliding on the U-shaped block 14.
In this embodiment, after the load current collected by the rogowski coil 10 sequentially passes through the first amplifying circuit 20 and the second amplifying circuit 30, the analog signal is converted into a digital signal through the a/D interface and is transmitted to the control module 2 to perform judgment of different fault types, the whole process has good linearity, no saturation dead zone, and high collection accuracy.
As a further optimization, in the preferred embodiment of the present invention, referring to fig. 1, the first amplifying circuit 20 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a first amplifier U1.
A first end of the first resistor R1 is connected to the negative output end of the rogowski coil 10, and a second end of the first resistor R1 is connected to the inverting input end of the first amplifier U1. A first end of the second resistor R2 is connected with the positive output end of the Rogowski coil 10, and a second end of the second resistor R2 is connected with the same-direction input end of the first amplifier U1; a first terminal of the third resistor R3 is connected to a second terminal of the first resistor R1, and a second terminal of the third resistor R3 is connected to an output terminal of the first amplifier U1. A first terminal of the first capacitor C1 is connected to a second terminal of the first resistor R1, and a second terminal of the first capacitor C1 is connected to an output terminal of the first amplifier U1.
In the present embodiment, the first amplifier circuit 20 is composed of the first amplifier U1 and its peripheral circuits. The first resistor R1 and the second resistor R2 are protection resistors of the first amplifier U1, and the first capacitor C1 and the third resistor R3 constitute a signal conditioning circuit of the first amplifier U1.
As a further optimization, referring to fig. 1, the second amplifying circuit 30 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second capacitor C2 and a second amplifier U2.
A first end of the fourth resistor R4 is connected with the output end of the first amplifier, and a second end of the fourth resistor R4 is connected with the inverting input end of the second amplifier U2; a first end of the fifth resistor R5 is connected with a reference voltage, and a second end of the fifth resistor R5 is connected with the same-direction input end of the second amplifier U2; a first end of the sixth resistor R6 is connected with a second end of the fourth resistor R4, and a second end of the sixth resistor R6 is connected with an output end of the second amplifier U2; a first end of the second capacitor C2 is connected with a second end of the fourth resistor R4, and a second end of the second capacitor C2 is connected with an output end of the second amplifier U2; the output end of the second amplifier U2 is connected with the first end of the seventh resistor R7, and the second end of the seventh resistor R7 is used for being electrically connected with the A/D interface of the control module 2.
In the present embodiment, the second amplification circuit 30 is composed of the second amplifier U2 and its peripheral circuits. The fourth resistor R4 is a current limiting resistor and a protection resistor of the second amplifier U2, and functions to limit the current of the output terminal of the first amplifier U1. The fifth resistor R5 is a protection resistor of the second amplifier U2, and the second capacitor C2 and the sixth resistor R6 constitute a signal amplifying circuit. The seventh resistor R7 is a current limiting resistor, which functions to limit the current at the output of the second amplifier U2. In addition, the second amplifying circuit 30 further includes a third capacitor C3, one end of the third capacitor C3 is connected between the seventh resistor R7 and the a/D interface, and the other end is grounded, which is used for filtering and eliminating high frequency components in the circuit. It should be noted that the first amplifier U1 and the second amplifier U2 are both connected to a power supply and ground.
The utility model discloses an overhead line current collection system that first embodiment provided sets up rogowski coil 10 through the inside at movable plate 11, first stand 12, second stand 13 and U type piece 14 to form the closed loop of rogowski coil 10 and carry out the collection of load current. Then the load current is sent to the A/D interface through the two amplifying circuits to be sent to the control module 2 for judging the fault information. The whole measurement process has good linearity and no saturation dead zone. Compared with the collection method of the movable plate 11 and the coil made of iron in the prior art, the current collection method has the advantages that the load current measurement precision is more accurate and can reach 1%.
Referring to fig. 3 to 5, a second embodiment of the present invention provides an overhead line fault indicator, including: the device comprises a power supply device 5, a wireless transmission module 4, a control module 2, an indicating device 3 for indicating the fault type and the current collecting device 1. Referring to fig. 3, the current collecting device 1, the control module 2, the wireless transmission module 4 and the indicating device 3 are electrically connected to the power supply device 5; the current collecting device 1 and the indicating device 3 are both connected with the control module 2; the control module 2 is connected with the master station system through a wireless transmission module 4. Wherein, power supply unit 5 provides electric power for whole fault indicator, and the load current information that collection system 1 gathered judges whether trouble through control module 2, and indicating device 3 is used for instructing the different instruction types that control module 2 judged to reachs on the spot, and wireless transmission module 4 then transmits the fault information that control module 2 judged for main website system, notifies the maintainer to maintain, has realized accomplishing the fault location function fast, improves maintenance efficiency.
Wherein, control module 2's chip model is MSP430FR5949, and control module 2's chip can select corresponding model according to actual conditions, here, the utility model discloses do not do specific restriction. The wireless transmission module 4 is a GPRS module or a 2G/3G/4G module.
As a further optimization, referring to fig. 4, the power supply device 5 includes a permalloy 51, a rectifying module 52, a protection module 53 and a boosting circuit module 54, which are connected in sequence; wherein, permalloy 51 is installed inside the movable plate 11, the first upright 12, the second upright 13 and the U-shaped block 14 to form a closed loop, and the output end of the booster circuit module 54 is connected with the current collecting device 1, the control module 2 and the wireless transmission module 4 respectively. It should be noted that the permalloy 51 can be made into a sheet shape and mounted inside the movable plate 11, the first upright 12, the second upright 13 and the U-shaped block 14 to form a closed loop; or may be a strip, as long as the electricity-taking effect can be achieved, which is not limited herein. The input end of the rectifying module 52 is connected with permalloy, and the alternating current electric energy is converted into direct current electric energy; the protection module 53 is used for protecting the boost circuit module 54 to prevent the subsequent modules from being damaged by the overhigh voltage; the boost circuit module 54 can boost the small voltage to meet the working voltage standard of the whole fault indicator, and the rectifier module 52, the protection module 53 and the boost circuit module 54 can all adopt the prior art, and are not described herein.
The conventional fault indicator is generally provided with an external power supply to provide power for the whole machine, or a power-taking circuit of the fault indicator needs to wait for the voltage to be charged to the working voltage of the whole machine by 3.3V, and then the fault indicator starts to work. However, in the embodiment, the permalloy 51 is used for taking electricity, so that current can be obtained as long as the line current is 5A, and then the voltage reaches the working voltage 3.3V required by the complete machine through the booster circuit module 54, so that the charging time cannot be shortened, the complete machine can quickly enter a full-function working mode, and power can be supplied to other devices of the whole fault indicator, such as the current collection device 1, the wireless transmission module 4, the indicating device 3 and the like, without installing an additional battery.
As a further optimization, the indicating device 3 includes a transparent lamp cover 31 disposed below the fault indicator in the vertical direction and an LED indicator lamp 32 disposed inside the transparent lamp cover 31, and the antenna 41 of the wireless transmission module 4 extends in the vertical direction and protrudes inside the lamp cover 31.
Specifically, referring to fig. 5, the entire fault indicator is structurally divided into a current collection device 1, a main body portion 6, and an indicating device 3, and the current collection device 1 is located at the uppermost end for suspending the entire fault indicator on a cable. The main body part 6 is positioned in the middle, the upper end is connected with the current collecting device 1, and the lower end is connected with the indicating device 3. Two amplifying circuits of the acquisition device 1, a rectifying module 52, a protection module 53, a booster circuit module 54, a wireless transmission module 4 and a control module 2 of the power supply device 5 are installed in the main body part 6, and the main body part 6 is filled and sealed by epoxy resin, so that the sealing performance is ensured, and the standard sealing requirement of the fault indicator is met. The indicating device 3 indicates different fault types on the spot by flashing the LED indicating lamps 32 with different colors, so that maintenance personnel can conveniently and quickly judge the fault types and maintain the fault types.
The antenna 41 of the wireless transmission module 4 of the existing fault indicator is usually potted in epoxy resin inside the body part 6, the communication distance is generally less than 30 meters, and the communication reliability is low. This embodiment extends and stretches into the inside lamp shade 31 along vertical direction through letting the antenna 41 of wireless transmission module 4 to avoid antenna 41 to encapsulate in epoxy, improved communication distance and communication reliability. It should be noted that the main body portion 6 and the indicating device 3 also include other conventional components, such as a card flipping mechanism, etc., but these conventional components do not relate to the innovation point of the present utility model, and therefore, the description thereof is omitted, and the drawings of the embodiment are also omitted.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is communication connection between them, and specifically, the connection relationship can be implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort. The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The overhead line current collecting device is characterized by comprising a movable plate, a first upright post and a second upright post which are oppositely arranged, a U-shaped block for connecting the first upright post and the second upright post, a Rogowski coil and a sampling circuit which is electrically connected with the Rogowski coil; two ends of the movable plate are respectively connected with the top ends of the first upright post and the second upright post in the vertical direction; the Rogowski coil is arranged at the central parts of the movable plate, the first upright post, the second upright post and the U-shaped block and used for forming a closed loop; the sampling circuit comprises a first amplifying circuit connected with the positive output end and the negative output end of the Rogowski coil and a second amplifying circuit connected with the output end of the first amplifying circuit, and the output end of the second amplifying circuit is electrically connected with an A/D interface of the control module.
2. The overhead line current collection device of claim 1, wherein the first amplification circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor, and a first amplifier;
the first end of the first resistor is connected with the negative output end of the Rogowski coil, and the second end of the first resistor is connected with the inverting input end of the first amplifier; the first end of the second resistor is connected with the positive output end of the Rogowski coil, and the second end of the second resistor is connected with the homodromous input end of the first amplifier; the first end of the third resistor is connected with the second end of the first resistor, and the second end of the third resistor is connected with the output end of the first amplifier; the first end of the first capacitor is connected with the second end of the first resistor, and the second end of the first capacitor is connected with the output end of the first amplifier.
3. The overhead line current collection device of claim 2, wherein the second amplification circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor, and a second amplifier;
a first end of the fourth resistor is connected with the output end of the first amplifier, and a second end of the fourth resistor is connected with the inverting input end of the second amplifier; a first end of the fifth resistor is connected with a reference voltage, and a second end of the fifth resistor is connected with a homodromous input end of the second amplifier; a first end of the sixth resistor is connected with a second end of the fourth resistor, and a second end of the sixth resistor is connected with an output end of the second amplifier; a first end of the second capacitor is connected with a second end of the fourth resistor, and a second end of the second capacitor is connected with an output end of the second amplifier; the output end of the second amplifier is connected with the first end of the seventh resistor, and the second end of the seventh resistor is used for being electrically connected with the A/D interface of the control module.
4. An overhead line fault indicator, comprising: the device comprises a power supply device, a wireless transmission module, a control module, an indicating device for indicating fault types and a current collecting device according to any one of claims 1-3; the current acquisition device, the control module, the wireless transmission module and the indicating device are electrically connected with the power supply device; the current acquisition device and the indicating device are both connected with the control module; and the control module is connected with the master station system through the wireless transmission module.
5. The overhead line fault indicator of claim 4, wherein the power supply device comprises permalloy, a rectifier module, a protection module, and a booster circuit module connected in series; the permalloy is installed inside the movable plate, the first upright post, the second upright post and the U-shaped block to form a closed loop, and the output end of the booster circuit module is connected with the current collecting device, the control module and the wireless transmission module respectively.
6. The overhead line fault indicator of claim 4, wherein the wireless transmission module is a GPRS module or a 2G/3G/4G module.
7. The overhead line fault indicator of claim 4, wherein the control module has a chip model MSP430FR 5949.
8. The overhead line fault indicator of claim 4, wherein the indicating device comprises a transparent lamp cover disposed vertically below the fault indicator and an LED indicator lamp disposed inside the transparent lamp cover, and the antenna of the wireless transmission module extends vertically and into the lamp cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921201840.9U CN210376565U (en) | 2019-07-29 | 2019-07-29 | Overhead line current acquisition device and fault indicator |
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| CN201921201840.9U CN210376565U (en) | 2019-07-29 | 2019-07-29 | Overhead line current acquisition device and fault indicator |
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| CN210376565U true CN210376565U (en) | 2020-04-21 |
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| CN201921201840.9U Active CN210376565U (en) | 2019-07-29 | 2019-07-29 | Overhead line current acquisition device and fault indicator |
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