CN214845641U - Online measuring device for contact voltage drop of low-voltage electrical appliance - Google Patents
Online measuring device for contact voltage drop of low-voltage electrical appliance Download PDFInfo
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- CN214845641U CN214845641U CN202022864476.3U CN202022864476U CN214845641U CN 214845641 U CN214845641 U CN 214845641U CN 202022864476 U CN202022864476 U CN 202022864476U CN 214845641 U CN214845641 U CN 214845641U
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Abstract
The utility model provides an online measuring device of contact pressure drop of low-voltage apparatus which characterized in that: the device comprises at least one controlled contact (1) and a voltage signal processing module (2), wherein one end of the at least one controlled contact (1) is connected with a to-be-detected end of a low-voltage apparatus, and the other end of the at least one controlled contact is connected with the voltage signal processing module (2). The method realizes online hardware measurement of the actual value of the contact voltage drop of the low-voltage apparatus, thereby providing actual data for life prediction.
Description
Technical Field
The utility model belongs to the technical field of low-voltage apparatus performance monitoring, specifically say exactly and relate to an online measuring device of low-voltage apparatus's contact pressure drop.
Background
When parameter testing and operation monitoring are carried out on switching equipment, the contact voltage drop of the circuit breaker needs to be accurately measured, particularly the contact voltage drop waveform at the moment of switching on and switching off, and the data and curves are very key indexes for measuring the performance and reliability of the circuit breaker. The conventional monitoring method is to disconnect the wiring of the circuit breaker and the busbar of the system, and connect the test equipment with the two ends of the busbar of the circuit breaker, so that the measurement can be carried out. And re-accessing the system after the measurement is finished. The traditional detection mode has the disadvantages of complex wiring and disconnecting operation, large workload, special offline measurement and incapability of being used for online measurement. Meanwhile, the contact wear of the circuit breaker is calculated by software (the contact wear rate is obtained according to the sampling main loop current and an algorithm) instead of an actual measurement value, and the data accuracy is poor. Meanwhile, the circuit breaker which is installed on the main circuit on the spot needs to be subjected to disconnection testing, and needs to be installed again after the testing is finished, so that the operation is complicated.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a measuring device to the contact pressure drop of above-mentioned current low-voltage electrical apparatus reachs through calculating but not measured value measurement accuracy is inaccurate, and needs off-line measuring's technical defect, provides the on-line measuring device of the contact pressure drop of low-voltage electrical apparatus, realizes the contact pressure drop actual value of online hardware measurement low-voltage electrical apparatus to provide actual data for the life-span prediction.
Technical scheme
In order to realize the technical purpose, the utility model provides a pair of online measuring device of contact pressure drop of low-voltage apparatus, its characterized in that: the device comprises at least one controlled contact and a voltage signal processing module, wherein one end of the at least one controlled contact is connected with the end to be detected of the low-voltage apparatus, and the other end of the at least one controlled contact is connected with the voltage signal processing module.
Further, the at least one controlled contact is in the form of a relay or, an auxiliary contact or a reed switch or a knob.
Furthermore, the voltage signal processing module comprises an overvoltage protection circuit, a first high-precision amplification circuit and a first signal processing circuit, the overvoltage protection circuit, the first high-precision amplification circuit and the first signal processing circuit are sequentially connected in series, one end of the overvoltage protection circuit is connected with the other end of at least one controlled contact, and the other end of the overvoltage protection circuit is connected with the first high-precision amplification circuit.
Further, the voltage signal processing module comprises a second high-precision amplifying circuit and a second signal processing circuit, the second high-precision amplifying circuit and the second signal processing circuit are sequentially connected in series, one end of the second high-precision amplifying circuit is connected with the other end of the at least one controlled contact, and the other end of the second high-precision amplifying circuit is connected with the second signal processing circuit.
Further, the first high-precision amplifying circuit is a high-resolution ADC.
Further, the second high-precision amplifying circuit is a high-resolution ADC.
Preferably, the end to be detected of the low-voltage apparatus is a contact or a busbar.
Preferably, the low-voltage electrical appliance is a circuit breaker or a contactor.
Advantageous effects
The utility model provides a pair of on-line measuring device of contact pressure drop of low-voltage apparatus realizes online hardware measurement low-voltage apparatus's contact pressure drop actual value to provide actual data for the life-span prediction.
Drawings
Fig. 1 is a schematic view of the connection relationship in embodiment 1 of the present invention.
Fig. 2 is a schematic view of the connection relationship in embodiment 2 of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
The utility model provides an online measuring device of contact pressure drop of low-voltage apparatus, includes at least one controlled contact 1 and voltage signal processing module 2, and this embodiment adopts 2 two controlled contacts, controlled contact 1's one end links to each other with the end of waiting to detect of low-voltage apparatus, and the other end links to each other with voltage signal processing module 2. In this embodiment, the low-voltage apparatus is a circuit breaker or a contactor. The end to be detected of the low-voltage apparatus is a contact or a busbar.
As shown in fig. 1, in detail, the controlled contact 1 is in the form of a relay or, an auxiliary contact or a reed switch or a knob. The voltage signal processing module 2 comprises an overvoltage protection circuit 201, a first high-precision amplification circuit 202 and a first signal processing circuit 203, the overvoltage protection circuit 201, the first high-precision amplification circuit 202 and the first signal processing circuit 203 are sequentially connected in series, one end of the overvoltage protection circuit 201 is connected with the other end of the controlled contact 1, and the other end of the overvoltage protection circuit 201 is connected with the first high-precision amplification circuit 202. In this embodiment, the first high-precision amplifying circuit 202 is a high-resolution ADC, and in this embodiment, the high-resolution ADC is a high-resolution analog-to-digital converter.
In this embodiment, the actual value is measured by using the hardware of the voltage signal processing module including the high-precision amplifying circuit (in this embodiment, an instrumentation amplifier); the controlled contact is connected in series between the contact of the circuit breaker and the measuring circuit, the contact can carry out closing and opening operations, the controlled contact can be a relay (electronic control)/an auxiliary contact (mechanical linkage with a main loop)/a reed switch (magnetic field generated by current of the main loop)/a knob (manual rotation), online measurement is realized at the same time, current data I of the main loop is obtained by using a controller, and pressure drop data U of the contact is measured by using the device, so that the contact resistance R is U/I, the whole measuring device not only realizes the requirement of isolating the incoming and outgoing lines of the circuit breaker, but also meets the requirement of measuring a pressure drop tiny signal, and the purpose of measuring an actual value by online hardware is realized, thereby providing actual data for life prediction
Example 2
As shown in fig. 2, in this embodiment, an embodiment is further provided, in which the voltage signal processing module 2 includes a second high-precision amplifying circuit 202 ' and a second signal processing circuit 203 ', the second high-precision amplifying circuit 202 ' and the second signal processing circuit 203 ' are sequentially connected in series, one end of the second high-precision amplifying circuit 202 ' is connected to the other end of the at least one controlled contact 1, and the other end of the second high-precision amplifying circuit 202 ' is connected to the second signal processing circuit 203 '. In this embodiment, the second high-precision amplifying circuit 202' is a high-resolution ADC, and in this embodiment, the high-resolution ADC is a high-resolution analog-to-digital converter.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (8)
1. The utility model provides an online measuring device of contact pressure drop of low-voltage apparatus which characterized in that: the device comprises at least one controlled contact (1) and a voltage signal processing module (2), wherein one end of the at least one controlled contact (1) is connected with a to-be-detected end of a low-voltage apparatus, and the other end of the at least one controlled contact is connected with the voltage signal processing module (2).
2. The on-line measuring device of the contact voltage drop of the low-voltage apparatus according to claim 1, characterized in that: the at least one controlled contact (1) is in the form of a relay or, an auxiliary contact or a reed switch or a knob.
3. The on-line measuring device of the contact voltage drop of the low-voltage apparatus according to claim 1, characterized in that: the voltage signal processing module (2) comprises an overvoltage protection circuit (201), a first high-precision amplification circuit (202) and a first signal processing circuit (203), wherein the overvoltage protection circuit (201), the first high-precision amplification circuit (202) and the first signal processing circuit (203) are sequentially connected in series, one end of the overvoltage protection circuit (201) is connected with the other end of at least one controlled contact (1), and the other end of the overvoltage protection circuit (201) is connected with the first high-precision amplification circuit (202).
4. The on-line measuring device of the contact voltage drop of the low-voltage apparatus according to claim 1, characterized in that: the voltage signal processing module (2) comprises a second high-precision amplifying circuit (202 ') and a second signal processing circuit (203 '), the second high-precision amplifying circuit (202 ') and the second signal processing circuit (203 ') are sequentially connected in series, one end of the second high-precision amplifying circuit (202 ') is connected with the other end of the at least one controlled contact (1), and the other end of the second high-precision amplifying circuit (202 ') is connected with the second signal processing circuit (203 ').
5. The device for on-line measurement of the contact voltage drop of a low-voltage apparatus according to claim 3, characterized in that: the high-precision amplifying circuit I (202) is a high-resolution ADC.
6. The device for on-line measurement of the contact voltage drop of a low-voltage apparatus according to claim 4, characterized in that: and the second high-precision amplifying circuit (202') is a high-resolution ADC.
7. The on-line measuring device of the contact voltage drop of the low-voltage apparatus according to claim 1, characterized in that: the end to be detected of the low-voltage apparatus is a contact or a busbar.
8. The on-line measuring device of the contact voltage drop of the low-voltage apparatus according to claim 1, characterized in that: the low-voltage electrical apparatus is a circuit breaker or a contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022864476.3U CN214845641U (en) | 2020-12-03 | 2020-12-03 | Online measuring device for contact voltage drop of low-voltage electrical appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022864476.3U CN214845641U (en) | 2020-12-03 | 2020-12-03 | Online measuring device for contact voltage drop of low-voltage electrical appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214845641U true CN214845641U (en) | 2021-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022864476.3U Active CN214845641U (en) | 2020-12-03 | 2020-12-03 | Online measuring device for contact voltage drop of low-voltage electrical appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214845641U (en) |
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2020
- 2020-12-03 CN CN202022864476.3U patent/CN214845641U/en active Active
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