CN215894762U

CN215894762U - Capacitance measuring instrument

Info

Publication number: CN215894762U
Application number: CN202121780199.6U
Authority: CN
Inventors: 韩煜; 王怀伟; 王天中
Original assignee: Jinneng Holding Coal Group Co Ltd
Current assignee: Jinneng Holding Coal Group Co Ltd
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2022-02-22
Anticipated expiration: 2031-08-02

Abstract

The utility model relates to the technical field of capacitance measurement, in particular to a capacitance measuring instrument. The utility model provides a capacitance measuring instrument capable of measuring large-capacity capacitance and measuring different capacitance ranges, aiming at solving the problem that a multimeter with a larger range needs to be replaced when the capacitance of the capacitance needing to be measured is larger than the range of the multimeter, and the capacitance measuring instrument comprises a plurality of series branches formed by connecting a plurality of known capacitors with the same capacity in series, a plurality of knob switches, the multimeter and a plurality of measured capacitance interfaces, wherein the known capacitors in different series branches have different capacities, the plurality of series branches are respectively connected with the plurality of knob switches and the plurality of measured capacitance interfaces in series in a one-to-one correspondence manner to form a plurality of range branches with different ranges respectively, and the plurality of range branches are connected with two measuring lines of the multimeter in parallel to form a loop. The utility model greatly reduces the workload of staff, and the measuring range is selected by controlling the on-off of the knob, thereby measuring the capacitors with different capacities.

Description

Capacitance measuring instrument

Technical Field

The utility model relates to the technical field of capacitance measurement, in particular to a capacitance measuring instrument.

Background

In actual production and daily work of a coal mine, equipment such as a transformer, a switch and the like is moved underground, so that certain risks exist in the using and moving processes, or the control unit is damaged to different degrees in the long-time running process of the equipment, and the main control unit and the display unit are remained in most of damaged parts except a mechanical structure; the main control unit is damaged and then the internal capacitor is burnt, and the removed capacitor is worn and cannot be seen due to long-time use, and at the moment, the capacitor capacity is measured by using an instrument capable of measuring the capacitor. In the prior art, a universal meter is generally adopted to measure the capacity of a capacitor, but the universal meter has a limited measuring range, when the capacity of the capacitor to be measured is larger than the measuring range of the universal meter, only the universal meter with a larger measuring range can be replaced or the component is mounted on normal equipment to be tested to measure the capacitance of the component, the measuring method is complex, and the equipment and the component can be damaged to a certain extent due to the unknown capacity of the capacitor in the testing process.

Disclosure of Invention

The utility model provides a capacitance measuring instrument which can measure a large-capacity capacitance and can measure different capacitance ranges, aiming at solving the problem that when the capacitance of the capacitance to be measured is larger than the range of a universal meter, the universal meter with a larger range needs to be replaced or other complicated methods need to be adopted for measurement.

The utility model is realized by adopting the following technical scheme:

a capacitance measuring instrument comprises a plurality of series branches formed by connecting a plurality of known capacitors with the same capacity in series, a plurality of knob switches, a universal meter and a plurality of measured capacitor interfaces, wherein the capacities of the known capacitors in different series branches are different (if the known capacitor in one series branch is 16000uf, the known capacitors in the other series branches are not 16000 uf), the plurality of series branches respectively correspond to the plurality of knob switches and the plurality of measured capacitor interfaces in series one to one and then respectively form a plurality of range branches with different ranges (one range branch comprises one series branch, one knob switch and one measured circuit interface), and the plurality of range branches are connected with two measuring lines of the universal meter in parallel to form a loop.

The measurement mode is as follows: firstly, according to the external shape of the measured capacitor, the measured capacitor is estimated to be a capacitor with a plurality of capacities, then connecting the measured capacitor to the measured capacitor interface of the corresponding measuring range branch (for example, if the known capacitor in the measuring range circuit is 16000uf, and the estimated capacitor of the measured capacitor is about 15000uf, then connecting the measured capacitor to the measured capacitor interface of the measuring range branch), then adjusting the multimeter to a capacitor gear, recording the reading of the multimeter as C, setting the total capacitor of the series branch as C2, setting the measured capacitor as C1, according to the formula of series capacitance, C = C1C 2/(C1+ C2), the measured capacitance value C1 can be obtained after derivation, if the reading can not be read, the over-range is displayed or the multimeter has no response, the change checks whether the connection part is firmly connected or not, or the change range is to connect the measured capacitor to the measured capacitor port of another range branch. By adopting the capacitance measuring instrument, a plurality of multimeters with different measuring ranges or other types of capacitance measuring instruments on the market are not needed to be purchased, and the capacitance measuring instrument can measure the capacitance with large capacity and the capacitance with various measuring ranges with different capacities.

The beneficial effects produced by the utility model are as follows: 1) The workload of staff is greatly reduced, and the measuring range is selected by controlling the on-off of a knob, so that the capacitors with different capacities are measured; 2) power supply is not needed, and energy consumption is reduced; 3) the volume is small and is not limited by places; 4) the operation is simple and convenient, the use is convenient, and the efficiency is high and the speed is high; 5) time and labor are saved, and the use is convenient; 6) the anti-interference capability is strong, the failure rate is low, and the anti-interference device is durable in use; 7) the device can measure large-capacity capacitance, and has wide measurement range and strong practicability.

Drawings

FIG. 1 is a schematic diagram of the operation of the present invention;

fig. 2 is a layout view of the outer wall of the front baffle of the present invention.

In the figure: 1-known capacitor, 2-knob switch, 3-universal meter, 4-universal meter interface, 5-measured capacitor, 6-measured capacitor interface, 7-calculator, 8-first range branch, 9-second range branch, 10-third range branch and 11-standby interface.

Detailed Description

A capacitance measuring instrument comprises a plurality of series branches formed by connecting a plurality of known capacitors 1 with the same capacity in series, a plurality of knob switches 2, a universal meter 3 and a plurality of tested capacitor interfaces 6, wherein the capacities of the known capacitors 1 in different series branches are different (for example, the known capacitor 1 in one series branch is 16000uf, and the known capacitors 1 in the other series branches are not 16000 uf), the plurality of series branches are respectively connected with the plurality of knob switches 2 and the plurality of tested capacitor interfaces 6 in series in a one-to-one correspondence manner to form a plurality of measuring branch circuits with different measuring ranges (one measuring branch circuit is composed of one series branch circuit, one knob switch 2 and one tested circuit interface), and the plurality of measuring branch circuits are connected with two measuring lines of the universal meter 3 in parallel to form a loop.

The measurement mode is as follows: firstly, according to the external shape of the measured capacitor 5, the measured capacitor 5 is estimated to be a capacitor with a large capacity, then the measured capacitor 5 is connected to the measured capacitor interface 6 of the corresponding measuring range branch (for example, the known capacitor 1 in the measuring range circuit is 16000uf, and the estimated capacitor 5 of the measured capacitor is about 15000 uf), then the measured capacitor 5 is connected to the measured capacitor interface 6 of the measuring range branch, then, the multimeter 3 is adjusted to a capacitance gear, the reading of the multimeter 3 is recorded as C, the total capacitance of the series branch is set as C2, the measured capacitance 5 is set as C1, according to the formula of series capacitance, C = C1C 2/(C1+ C2), the value C1 of the measured capacitance 5 can be obtained after derivation, if the reading can not be read, the measuring range is displayed to be exceeded or the universal meter 3 does not respond, the connection part is replaced and checked to be firmly connected, or the capacitance 5 to be measured is connected to the mouth of the capacitance 5 to be measured of another range branch. By adopting the capacitance measuring instrument, the large-capacity capacitance and the capacitances with various different capacity ranges can be measured only by the capacitance measuring instrument without purchasing multimeters 3 with various different ranges or other types of capacitance measuring instruments on the market.

During specific implementation, the number of the series branches is three, the series branches are a first series branch, a second series branch and a third series branch respectively, the number of the range branches is three, the range branches are a first range branch, a second range branch and a third range branch 10 respectively, the capacity of each known capacitor 1 on the first series branch is 16000uf, the capacity of each known capacitor 1 on the second series branch is 8000uf, the capacity of each known capacitor 1 on the third series branch is 5000uf, the number of the knob switches 2 is three, the number of the tested capacitor interfaces 6 is three, the number of the known capacitors 1 on the first series branch is 32, the number of the known capacitors 1 on the second series branch is 16, and the number of the known capacitors 1 on the third series branch is 16. Principle analysis: therefore, the total capacitance of the known capacitors 1 with the capacity of 16000uf in the first series branch after series connection is 500uf, so that the total capacitance of the first measuring range branch after the tested capacitor 5 is connected in series is certainly less than 500uf, a value C can be obtained through the universal meter 3 in a measuring range which can be measured by the universal meter 3, and then a value C1 of the tested capacitor 5 can be obtained through formula derivation; the total capacitance of 16 known capacitors 1 with the capacity of 8000uf in the second series branch after series connection is 500uf, so that the total capacitance of the second measuring range circuit after the capacitor to be measured 5 is connected in series is certainly less than 500uf, a C value can be obtained through the universal meter 3 in a measuring range which can be measured by the universal meter 3, and then the value C1 of the capacitor to be measured 5 is obtained through derivation according to a formula; the total capacitance of 16 known capacitors 1 with the capacity of 5000uf in the third series branch after series connection is 302uf, so that the total capacitance of the third range circuit after the tested capacitor 5 in series connection is certainly less than 302uf, and in the range of the range that the universal meter 3 can measure, the universal meter 3 can obtain the value C, and then the value C1 of the tested capacitor 5 can be obtained by derivation according to a formula.

During specific implementation, still including two universal meter interfaces 4 that are used for with two measuring lines of universal meter 3 intercommunication, by preceding baffle, the backplate, left baffle, right baffle, the bottom plate, the square box body that the roof constitutes, establish the circuit board in the square box body, whole known electric capacity 1 all is located the circuit board, three rotary switch 2 is located preceding baffle outer wall, three measured capacitance interface 6 is located preceding baffle outer wall, two universal meter interfaces 4 are located preceding baffle outer wall, such design makes this measuring instrument more portable, and small in size, do not receive the place restriction.

In the specific embodiment, the calculator 7 is further fixedly mounted on the front baffle of the square box body, so that the capacity of the measured capacitor 5 can be calculated conveniently through derivation. The length of the square box body is 40cm, the width is 30cm, and the height is 20 cm. Handles are arranged on the left baffle and the right baffle of the square box body, and the square box is convenient to carry. The front baffle of the square box body is also provided with a standby interface 11.

Proved by numerous tests, when the measured capacitor 5 is 0-10000 muF, the error is small, and the error interval is 0.2% -0.4%; if the actual capacity of the capacitor 5 to be measured is more than 10000 muF, the error interval is 0.5% -3%, and the actual requirement is met.

Claims

1. The utility model provides a capacitance measuring instrument, its characterized in that, including many the series branch that forms after establishing ties by known electric capacity (1) of a plurality of same capacity, a plurality of knob switch (2), universal meter (3), a plurality of measured capacitance interface (6), the capacity of known electric capacity (1) in the different series branch is inequality, a plurality of series branch respectively with a plurality of knob switch (2), a plurality of measured capacitance interface (6) carry out the range branch that forms a plurality of different ranges respectively after the one-to-one establishes ties, a plurality of range branch connect in parallel back and form the return circuit with two measuring wire intercommunications of universal meter (3).

2. The capacitance measuring instrument according to claim 1, wherein the number of the series branches is three, and the series branches are a first series branch, a second series branch and a third series branch, the capacity of each known capacitor (1) on the first series branch is 16000uf, the capacity of each known capacitor (1) on the second series branch is 8000uf, the capacity of each known capacitor (1) on the third series branch is 5000uf, the number of the knob switches (2) is three, the number of the measured capacitive interfaces (6) is three, the number of the known capacitors (1) on the first series branch is 32, the number of the known capacitors (1) on the second series branch is 16, and the number of the known capacitors (1) on the third series branch is 16.

3. The capacitance measuring instrument according to claim 2, further comprising two multimeter interfaces (4) for communicating with two measuring lines of a multimeter (3), and a square box body consisting of a front baffle, a rear baffle, a left baffle, a right baffle, a bottom plate and a top plate, wherein a circuit board is arranged in the square box body, all known capacitors (1) are arranged on the circuit board, three knob switches (2) are arranged on the outer wall of the front baffle, three tested capacitor interfaces (6) are arranged on the outer wall of the front baffle, and the two multimeter interfaces (4) are arranged on the outer wall of the front baffle.

4. A capacitance measuring instrument according to claim 3, wherein the calculator (7) is fixedly mounted on the front baffle of the square box.

5. A capacitance measuring instrument as claimed in claim 4, wherein the square box has a length of 40cm, a width of 30cm and a height of 20 cm.

6. The capacitance measuring instrument according to claim 5, wherein the left and right baffles of the square box are provided with handles.

7. Capacitance measuring instrument according to claim 6, characterized in that the front panel of the square box is provided with a spare interface (11).