CN220105162U

CN220105162U - Direct resistance measuring device of current transformer

Info

Publication number: CN220105162U
Application number: CN202321534347.5U
Authority: CN
Inventors: 刘沙
Original assignee: Guangxi Electrical Polytechnic Institute
Current assignee: Guangxi Electrical Polytechnic Institute
Priority date: 2023-06-15
Filing date: 2023-06-15
Publication date: 2023-11-28
Anticipated expiration: 2033-06-15

Abstract

The utility model discloses a direct resistance measuring device of a current transformer, relates to the technical field of direct resistance measurement, and solves the problems of poor personnel cooperation and low measuring efficiency in the direct resistance measuring process of the current transformer. The technical scheme is characterized by comprising a box body, wherein a direct resistance measurement comparison unit is arranged in the box body, the direct resistance measurement comparison unit is provided with a plurality of measurement channels, the measurement channels are positioned on the wall of the box body, and each measurement channel is correspondingly provided with a state display area; the terminal strip is provided with a plurality of groups of wiring positions, each group of wiring positions is connected with a current transformer to be tested, and each group of wiring positions is connected with a measuring channel through a cable so as to measure the measuring resistance of the current transformer connected with the measuring channel; the touch display screen is arranged on the wall of the box and connected with the direct resistance measurement comparison unit. According to the utility model, the direct resistance measurement, registration and other maintenance work of the current transformer can be completed by one worker, so that the maintenance efficiency is improved, and the maintenance period is saved.

Description

Direct resistance measuring device of current transformer

Technical Field

The utility model belongs to the technical field of direct resistance measurement, and particularly relates to a direct resistance measurement device of a current transformer.

Background

The current transformer loop of the electrical system is widely applied to measuring, metering and protecting loops of the electrical system, and is used for converting high voltage into low voltage, and is the most important component of relay protection. The primary winding turns are very few and are connected in series with the circuit of the current to be measured, so that the current is always flowing through the circuit, the secondary winding turns are relatively large and are connected in series with the measuring instrument and the protection circuit, and the secondary circuit is always closed when the current transformer works, so that the impedance of the series coil of the measuring instrument and the protection circuit is very small, and the working state of the current transformer is close to short circuit. The current transformer is used by converting primary side large current into secondary side small current, and the secondary side cannot be opened. Therefore, before the maintenance work of the protection device is finished, in order to ensure the safe and reliable operation of the equipment, the direct resistance test of the current transformer loop is required to be carried out, and the whole loop is ensured to be intact without break points.

In the current test, when the electric tester performs direct resistance measurement of a current transformer loop of the field protection device, the current tester measures the direct resistance of the current transformer loop at the broken position of the terminal strip of the protection device before the connection of the current terminal strip is closed after the sampling of the relay protection device or the protection logic verification is completed on the field, so that the integrity of the loop is ensured, three people are required to perform the operation at least, one person holds two meters for measuring, one person holds the multimeter for data reading, the third person performs the recording of the measured data and performs comparison analysis with the maintenance standard to judge whether the direct resistance of the loop meets the operation requirement, the whole working process needs the whole process of closely matching of the personnel, the protection device relates to the current transformer, the terminal measurement efficiency is low one by one, and the field construction period is influenced.

Disclosure of Invention

The utility model aims to provide a direct resistance measuring device for a current transformer, so that the problems of poor personnel cooperation and low measuring efficiency in the direct resistance measuring process of the current transformer can be effectively avoided. The specific technical scheme is as follows:

a current transformer direct resistance measurement device, comprising:

the device comprises a box body and a control unit, wherein the box body is used for protecting components in the box body, a direct resistance measurement comparison unit is arranged in the box body, the direct resistance measurement comparison unit is provided with a plurality of measurement channels, the measurement channels are positioned on the wall of the box body, and each measurement channel is correspondingly provided with a state display area;

the terminal strip is provided with a plurality of groups of wiring positions, each group of wiring positions is connected with a current transformer to be tested, and each group of wiring positions is connected with a measuring channel through a cable so as to measure the measured resistance value of the current transformer connected with the measuring channel;

the touch display screen is arranged on the box wall and connected with the direct resistance measurement comparison unit and used for inputting a standard resistance value and comparing with the measured resistance value.

Preferably, the status display area includes a channel name, an indicator light, and a resistance display window.

Preferably, the indicator light comprises a red light and a green light, the green light is turned on when the measured resistance value is smaller than the standard resistance value, and the red light is turned on when the measured value is larger than the standard resistance value.

Preferably, one group of the wiring positions comprises sockets arranged on two sides of the terminal block, one end of one cable is inserted into the right socket, and the other end of the cable is connected to the corresponding measuring channel; one end of the other cable is connected with the left socket, and the other end of the other cable is connected with the measuring channel to form a measuring loop.

Preferably, the socket adopts a Phoenix universal current test terminal socket.

Preferably, the cables are marked with marks with the same names as the corresponding connection channels.

Preferably, the resistance measurement comparison unit is an STM32 singlechip.

Preferably, a power supply is further arranged in the box body, and the power supply is electrically connected with the indicator lamp, the touch display screen and the resistance measurement comparison unit.

Preferably, the box body is also provided with a self-checking indicator lamp, and when the measuring channel is abnormal, the resistance standard and the judging module display abnormality, the self-checking indicator lamp is lightened, and the self-checking indicator lamp reminds a user to check.

Preferably, a switch button is further arranged on the box body.

Compared with the prior art, the utility model has the following beneficial effects:

1. according to the utility model, the state display area is correspondingly arranged on each measuring channel, so that different current transformers are distinguished, when the current transformer measured on the measuring channel fails, the fault state is timely displayed on the state display area of the measuring channel, and the overhaul work such as direct resistance measurement, registration and the like of the current transformer can be completed by one staff, so that the overhaul efficiency is improved, and the overhaul period is saved.

2. According to the utility model, by adopting a plurality of connecting lines on the terminal strip, one person can overhaul a plurality of current transformers at the same time, so that the problems of poor personnel cooperation and low measurement efficiency in the direct resistance measurement process of the current transformers can be effectively avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are required to be used in the description of the embodiments will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a functional block diagram of the present utility model.

The main reference numerals illustrate:

the device comprises a 1-box body, a 2-state display area, a 3-terminal block, a 4-wiring position, a 5-jack, a 6-cable, a 7-cable bundle, an 8-touch display screen, a 9-channel name, a 10-red light, a 11-green light, a 12-resistance display window, a 13-self-checking indicator light, a 14-switch button and a 15-mark.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "inside", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The terms "first," "second," "third," and the like, if any, are used for descriptive purposes only and for distinguishing between technical features and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "configured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. Hereinafter, an embodiment of the present utility model will be described in accordance with its entire structure.

Referring to fig. 1 and 2, a direct resistance measurement device of a current transformer includes:

the box body 1 is used for protecting components in the box body 1, a direct resistance measurement comparison unit is arranged in the box body 1, the direct resistance measurement comparison unit is provided with a plurality of measurement channels, the direct resistance measurement comparison unit is positioned on the box wall of the box body 1, each measurement channel is correspondingly provided with a state display area 2, and the state display areas 2 are used for displaying measurement information correspondingly connected with the current transformer; the terminal block 3, the terminal block 3 has several groups of wiring positions 4, each group of wiring positions 4 connects a current transformer to be measured, and each group of wiring positions 4 connects a measuring channel through the cable 6 in order to measure the measuring resistance of the current transformer that the measuring channel connects; the touch display screen 8 is arranged on the wall of the box and connected with the direct resistance measurement comparison unit, and is used for inputting a standard resistance value and comparing with the measured resistance value.

In this embodiment, the single-chip microcomputer of STM32 series is set in the box 1 as the direct resistance measurement contrast unit, and meanwhile, the STM32 includes a resistance measurement module and a resistance contrast module, the resistance measurement module is a direct resistance measurement circuit, the direct resistance measurement circuit is a conventional existing resistance measurement circuit, which is not described in detail herein, different measurement channels are connected with different wiring positions 4 through cables 6, so that the direct resistances of different current transformers can be measured by different measurement channels to obtain the measured resistance, the resistance measurement contrast unit obtains the measured resistance and compares the measured resistance with the standard resistance input from the touch display screen 8, and when the measured resistance is smaller than the standard resistance, the measured resistance is considered to be in good condition, the corresponding indication symbol is displayed in the state display area 2, so that staff can judge and record data, in this process, a staff can operate, the test period is greatly saved, meanwhile, a charging battery is also adopted to provide power for the direct resistance measurement contrast unit, the touch display screen 8, the state display area 2 and the like, and even if the current transformer can work normally in the outdoor terminal.

Preferably, the status display area 2 is provided with a channel name 9, an indicator light, and a resistance display window 12. The state display area 2 includes a name of a channel marked 15 for distinguishing different measuring channels to measure different current transformers, so as to judge which measuring channel is used for measuring the current transformer with a problem, the indicator lamp is used for indicating the measuring result of the current transformer measured on the measuring channel, the resistance display window 12 is used for displaying the measured value of the direct resistance of the measured current transformer and is used for reference, and in addition, the indicator lamp and the resistance display window 12 are connected to the STM32 singlechip and the STM32 singlechip is used for controlling the work of the current transformer.

Preferably, the indicator light comprises a red light 10 and a green light 11, the green light 11 is turned on when the measured resistance value is smaller than the standard resistance value, and the red light 10 is turned on when the measured value is larger than the standard resistance value.

Preferably, the group of wiring positions 4 comprises sockets 5 arranged on two sides of the terminal strip 3, wherein one end of one cable 6 is spliced on the right socket 5, and the other end is connected to a corresponding measuring channel; one end of the other cable 6 is connected with the left jack 5, and the other end is connected with the measuring channel to form a measuring loop. Specifically, the two sides of the terminal strip 3 are respectively provided with a vertically arranged socket 5, wherein two sockets 5 positioned on the same horizontal straight line form a group of wiring positions 4, the wiring positions 4 are connected with the current transformer to be measured, and the direct resistance of the current transformer can be measured by being connected to a measuring channel through a cable 6.

Preferably, the socket 5 is a universal current test terminal socket 5 of the phoenix type. The cable 6 is inserted, and the direct resistance measurement and display of multiple loops can be performed by direct start.

Preferably, the cables 6 are each marked 15 with the same marking 15 as the corresponding connection channel name 9. In this embodiment, two cable 6 bundles 7 are prepared in total, each cable 6 bundle 7 is composed of the same number of cables 6 as the number of wires, and each cable 6 is marked 15 with the same channel name 9 of the measurement channel connected with the cable 6, for example, if the channel name 9 of the measurement channel is 1, the cable 6 connected with the measurement channel with the channel name 9 of 1 is also marked 15 with 1, the channel name 9 of the measurement channel is 2, the cable 6 connected with the measurement channel with the channel name 9 of 2 is also marked 15 with 2, and the like, so that the misplacement measurement is prevented from being caused by misplacement connection when the cable 6 wires are connected, and the measurement result is confused.

Preferably, the power supply is electrically connected with the indicator light, the touch display screen 8 and the resistance measurement comparison unit.

Preferably, the box 1 is further provided with a self-checking indicator 13, and when the measuring channel is abnormal, the resistance standard and the judging module display abnormality, the self-checking is on, so as to remind a user to check. In this embodiment, the self-checking indicator 13 is connected with the STM32 single-chip microcomputer, and when any one of the measuring channels of the device is abnormal, the resistance standard and the judging module display abnormality, the self-checking is on, so as to remind the user to check.

Preferably, the case 1 is further provided with a switch button 14. Switch start-stop button for realizing start-up and shut-down of device

The foregoing description of specific exemplary embodiments of the utility model has been presented for the purpose of illustration and description, but it is not intended to limit the utility model to the precise form disclosed, and it is apparent that many changes and modifications may be made in accordance with the above teachings, and while embodiments of the utility model have been shown and described, this specific embodiment is merely illustrative of the utility model and not restrictive, the particular features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner, the exemplary embodiments being selected and described for the purpose of explaining the specific principles of the utility model and its practical application, so that modifications, substitutions, variations, and various other changes may be made to the embodiments without creatively departing from the principles and spirit of the utility model as desired by those skilled in the art without departing from the scope of the patent claims.

Claims

1. A current transformer direct resistance measuring device, comprising:

the box body (1) is used for protecting components in the box body (1), a direct resistance measurement comparison unit is arranged in the box body (1), a plurality of measurement channels are arranged in the direct resistance measurement comparison unit and are positioned on the box wall of the box body (1), each measurement channel is correspondingly provided with a state display area (2), and the state display areas (2) are used for displaying measurement information corresponding to the current transformer;

the terminal strip (3), the terminal strip (3) has several groups of wiring positions (4), each group of said wiring positions (4) connect a current transformer to be measured, and each group of wiring positions (4) connect a measuring channel through the cable (6) in order to measure the measurement resistance of the current transformer that the measuring channel connects;

the touch display screen (8), touch display screen (8) are located on the wall of case and are connected with the direct resistance measurement contrast unit for input standard resistance, be used for with measure the resistance and compare.

2. The direct resistance measuring device of the current transformer according to claim 1, wherein the status display area (2) is provided with a channel name (9), an indicator light and a resistance display window (12).

3. The direct resistance measuring device of the current transformer according to claim 2, wherein the indicator lamp comprises a red lamp (10) and a green lamp (11), the green lamp (11) is lighted when the measured resistance value is smaller than the standard resistance value, and the red lamp (10) is lighted when the measured value is larger than the standard resistance value.

4. The direct resistance measuring device of the current transformer according to claim 1, wherein one group of the wiring positions (4) comprises sockets (5) arranged at two sides of the terminal block (3), one end of one cable (6) is inserted into the right socket (5), and the other end is connected to a corresponding measuring channel; one end of the other cable (6) is connected with the left jack (5), and the other end is connected with the measuring channel to form a measuring loop.

5. The direct resistance measuring device of a current transformer according to claim 4, wherein the socket (5) is a universal current test terminal socket (5) of the phoenix type.

6. The direct resistance measuring device of the current transformer according to claim 1, characterized in that the cables (6) are marked (15) with the same mark (15) as the corresponding connection channel name (9).

7. The direct resistance measuring device of the current transformer according to claim 1, wherein the resistance measuring and comparing unit is an STM32 single-chip microcomputer.

8. The direct resistance measuring device of the current transformer according to claim 2, wherein a power supply is further arranged inside the box body (1), and the power supply is electrically connected with the indicator lamp, the touch display screen (8) and the resistance measuring comparison unit.

9. The direct resistance measuring device of the current transformer according to claim 1, wherein the box body (1) is further provided with a self-checking indicator lamp (13).

10. The direct resistance measuring device of the current transformer according to claim 1, wherein a switch button (14) is further arranged on the box body (1).