CN216956157U

CN216956157U - Portable multi-path current test box

Info

Publication number: CN216956157U
Application number: CN202220013516.XU
Authority: CN
Inventors: 肖烈; 陈伟强; 陈新芝; 谷立安; 王荣; 冯靓; 李平
Original assignee: Hunan Shiyou Electric Public Co ltd
Current assignee: Hunan Shiyou Electric Public Co ltd
Priority date: 2022-01-05
Filing date: 2022-01-05
Publication date: 2022-07-12
Anticipated expiration: 2032-01-05

Abstract

The utility model discloses a portable multi-path current test box, which comprises: the device comprises a box body, a plurality of phase sequence acquisition chips and a plurality of serial port servers, wherein at least two current acquisition modules and a serial port server are arranged in the box body, and each current acquisition module is internally provided with a plurality of paths of phase sequence acquisition chips and three times of alternating current acquisition chips of the phase sequence acquisition chips; the acquisition ends of all the current acquisition modules are connected with a corresponding number of current transformers through acquisition interfaces corresponding to the number of the phase sequence acquisition chips; the output ends of the two current acquisition modules are connected with a communication interface arranged on the box body through a serial server. The utility model is more convenient to use.

Description

Portable multi-path current test box

Technical Field

The utility model relates to the technical field of circuit testing of industrial equipment, in particular to a portable multi-path current testing box.

Background

The industrial automation system has a large number of electric devices, and the current of the test device is required during system test and fault diagnosis. In the field of industrial automation, the requirements for current testing are: the test precision is high, the operation is convenient, the test is rapid, the original appearance of the product is not changed, the multi-path current can be tested simultaneously, and the test data can be transmitted to a computer for further analysis and the like.

Currently, in the field of industrial automation, the device current test has two modes, namely an ammeter test and a current transformer test which are transmitted to a controller (such as a PLC). These two approaches have the following drawbacks:

the manual current holding meter tests the current, only single equipment current can be tested one by one and manually recorded, and multiple paths of current cannot be tested simultaneously for data analysis; when the current transformer and the controller (such as PLC) are used for measuring the current, additional expenses such as circuit design, wiring and software programming are required to be specially added for the current test, and the current transformer and the controller are disposable and cannot be reused.

SUMMERY OF THE UTILITY MODEL

The utility model provides a portable multi-path current testing box, which is used for solving the problem that the conventional manual test cannot simultaneously test multi-path current for data analysis; and the current is measured by the current transformer and the industrial controller, and the universality is poor.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

a portable multi-way current test chamber comprising: the box body is internally provided with at least two current acquisition modules and a serial server,

each current acquisition module is internally provided with a plurality of paths of phase sequence acquisition chips and three times of alternating current acquisition chips of the phase sequence acquisition chips;

the acquisition ends of all the current acquisition modules are connected with a corresponding number of open-ended clamp-on current transformers through acquisition interfaces corresponding to the number of the phase sequence acquisition chips;

the output ends of all the current acquisition modules are connected with a communication interface arranged on the box body through a serial server.

Preferably, each alternating current acquisition chip is connected with a corresponding acquisition interface for plugging an external current transformer; the acquisition interfaces are all arranged on the box body.

Preferably, every three alternating current acquisition chips are connected with one phase sequence acquisition chip and used for judging the phase sequence when three alternating currents are matched to acquire the current value of the three-phase alternating current.

Preferably, the communication interface is a network cable interface, the serial server receives the current value and the phase sequence data from the current acquisition module through a modbusRTU protocol, converts the current value and the phase sequence data into data of a modbusTCP protocol, and transmits the data to a terminal or a server connected to the network cable interface through the network cable interface.

Preferably, each current collection module is internally provided with 8 paths of phase sequence collection chips and 24 paths of alternating current collection chips.

Preferably, 4 acquisition interfaces are arranged on the box body, and each acquisition interface is used for plugging a wiring harness with a plug integrated by 12 split-core type current transformers.

Preferably, the device also comprises a power adapter or a 12V miniature storage battery for supplying power to the portable multi-way current test box.

The utility model has the following beneficial effects:

1. compared with a current sensor system which is installed in a complex way or a manual handheld ammeter for measurement, the portable multi-path current test box can use a small-size portable suitcase type, is more convenient and quick, and does not need to be provided with a power supply and a lead.

2. In a preferable scheme, the utility model can realize the collection of three-phase current and phase sequence of at most 16 loops, can also be used as the collection of at most 48 single-phase currents, and the collected data is transmitted by bus communication, can be directly read by a computer, and can also be secondarily developed by a PLC or an industrial personal computer.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic circuit diagram of a portable multi-channel current test box of the present invention in accordance with a preferred embodiment of the present invention;

fig. 2 is a schematic structural diagram of the case body of the portable multi-path current test case of the present invention according to the preferred embodiment of the present invention.

The reference numerals in the figures denote:

1. a communication interface; 2. an acquisition interface; 3. a power switch; 4. a panel; 5. and (4) a box body.

Detailed Description

The embodiments of the utility model will be described in detail below with reference to the drawings, but the utility model can be implemented in many different ways as defined and covered by the claims.

Referring to fig. 1, the portable multi-path current test box of the present invention comprises: the device comprises a box body 5, wherein two current acquisition modules and a serial server are arranged in the box body 5, and each current acquisition module is internally provided with a plurality of phase sequence acquisition chips and three times of alternating current acquisition chips of the phase sequence acquisition chips; the acquisition ends of the two current acquisition modules are connected with a corresponding number of open-ended clamp-on current transformers through acquisition interfaces 2 corresponding to the number of the phase sequence acquisition chips; the output ends of the two current acquisition modules are connected with a communication interface 1 arranged on the box body 5 through a serial server.

According to the structure, the collected data are transmitted by bus communication, can be directly read by a computer, and can also be subjected to secondary development by a PLC or an industrial personal computer. By adopting the box type structure, the utility model can use a portable suitcase type with small volume, and is more convenient.

In this embodiment, each current collection module is internally provided with 8 paths of phase sequence collection chips and 24 paths of alternating current collection chips. Every three alternating current acquisition chips are connected with one phase sequence acquisition chip and used for judging the phase sequence when three alternating currents are matched to acquire the current value of the three-phase alternating current. For example: and sequentially taking each adjacent 3 paths of alternating current as 1 loop of three-phase alternating current, and carrying out phase sequence judgment, namely taking the 1 st, 2 nd and 3 paths as the 1 st loop of three-phase alternating current, taking the 4 th, 5 th and 6 paths as the 2 nd loop of three-phase alternating current, and so on. The current collection module can collect alternating current not exceeding 20mA, the collection precision is 2%, the phase sequence states can be judged to be a left phase sequence, a right phase sequence and a wrong phase sequence, and if the detected object is the current of a three-phase motor, the three phase sequences respectively correspond to the forward rotation state, the reverse rotation state and the non-rotation state of the motor.

Referring to fig. 2, the case 5 of the present embodiment is a small portable suitcase type trailer box. The upper panel 4 is made of aluminum, a power switch 3, a power socket, a network cable socket and 4 current clamp wire harness sockets are arranged on the upper panel, and the panel 4 is also printed with text information such as product specifications and use instructions in a silk-screen mode. The bottom plate is arranged in the box body 5, two current acquisition modules and a serial server are arranged on the bottom plate, the two current acquisition modules are connected to the serial server in parallel through a shielded twisted pair, and the serial server is connected to the communication interface 1 (in the embodiment, a network cable socket) of the panel 4 through a network cable. Each alternating current acquisition chip is connected with a corresponding acquisition interface 2 for an external current transformer to be inserted; the acquisition interfaces 2 are all arranged on the box body 5. Be provided with 4 collection interfaces 2 (4 electric current pincers pencil sockets promptly) on the box 5, every collection interface 2 all is used for supplying 12 opening split type current transformer integrated area plug pencil to connect and insert. The current clamp wire harness is formed by manufacturing 12 open clamp type current transformers into a wire harness with a plug, and is inserted into the acquisition interface 2 of the panel 4 when in use.

In this embodiment, after the sine waveform of the current to be measured is converted into the current within the measuring range of the current collection module according to the transformation ratio, the current and the phase sequence data are obtained through measurement and waveform comparison. Preferably, the communication interface is a network cable interface. The serial server receives the current value and the phase sequence data from the current acquisition module through a modbusRTU protocol, converts the current value and the phase sequence data into data of a modbusTCP protocol, and transmits the data to a terminal or a server connected to a network cable interface through the network cable interface, for example: and transmitting the data to computer monitoring software for data display, or transmitting the data to a controller (PLC or industrial personal computer) for secondary development of the data.

In this embodiment, the annex still has general 12V power adapter or 12V miniature battery, and both are used for supplying power for the current test box, and the difference is, the miniature battery power supply of 12V need not external supply socket, and is more convenient. The power adapter may also charge a battery. Other accessories are also network cables for transmitting test results to a computer or controller.

The embodiment works as follows:

after the current test box is connected with a power supply (battery power supply or adapter power supply), current tests are respectively carried out on the following collection objects:

acquisition of the object 1: the current is clamped on the outlet wire of the motor contactor at the outlet end of the electric control cabinet in sequence.

Acquisition object 2: the current is clamped on the single-phase electric equipment outlet wire of the outlet end of the electric control cabinet in sequence.

Use 1: and plugging a network cable to the computer. And (4) starting matched monitoring software on the computer, and directly reading the current and phase sequence value of the tested line.

Use 2: and plugging a network cable into a PLC (programmable logic controller) or an industrial personal computer, configuring modbus TCP (transmission control protocol) communication in PLC or industrial personal computer software, reading current and phase sequence data, and performing secondary development.

When the object 1 is collected, the current test box collects three-phase current and phase sequence of 16 loops at most.

When acquiring object 2, the phase sequence data can be discarded, and the current test box is up to 48 single-phase current acquisitions.

The single-phase current acquisition and the three-phase current phase sequence acquisition can be mixed to acquire and enter a PLC or an industrial personal computer for secondary development. Two or more current test boxes can be connected to the same PLC or industrial personal computer through a switch to perform simultaneous parallel acquisition and secondary development.

The actual number of the collection paths can be less than the maximum number of the collection paths of the current test box.

When the acquisition range needs to be changed, the type of the external current clamp (the range and the transformation ratio of the current clamp) can be changed

In conclusion, 16-loop three-phase current testing and phase sequence acquisition can be carried out by most customers, and single-phase current acquisition can be carried out by most 48 loops. The collected data is transmitted by bus communication, can be directly read by a computer, and can also be subjected to secondary development by a PLC or an industrial personal computer. A small volume portable luggage case style appearance structure. The utility model is more convenient to use.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A portable multichannel current test case which characterized in that includes: the box body is internally provided with at least two current acquisition modules and a serial server,

and the output ends of all the current acquisition modules are connected with a communication interface arranged on the box body through the serial server.

2. The portable multipath current test box of claim 1, wherein each alternating current acquisition chip is connected with a corresponding acquisition interface for an external current transformer to be plugged; the acquisition interfaces are arranged on the box body.

3. The portable multi-path current testing box of claim 2, wherein every three alternating current collecting chips are connected with a phase sequence collecting chip for phase sequence judgment when three alternating currents are used for collecting current values of three-phase alternating currents in a matching manner.

4. The portable multipath current testing box of claim 3, wherein the communication interface is a network cable interface, and the serial server receives the current value and the phase sequence data from the current collection module via a modbusRTU protocol, converts the current value and the phase sequence data into data of a modbusTCP protocol, and transmits the data to a terminal or a server connected to the network cable interface via the network cable interface.

5. The portable multipath current testing box of any one of claims 1 to 4, wherein each current collection module is internally provided with 8 paths of phase sequence collection chips and 24 paths of alternating current collection chips.

6. The portable multipath current testing box of claim 5, wherein the box body is provided with 4 acquisition interfaces, and each acquisition interface is used for plugging a wiring harness with a plug integrated by 12 open clamp type current transformers.

7. The portable multi-channel current test box according to any one of claims 1 to 4, further comprising a power adapter or a 12V micro-battery for supplying power to the portable multi-channel current test box.