CN219533318U

CN219533318U - Three-phase bridge circuit detection meter

Info

Publication number: CN219533318U
Application number: CN202320823290.4U
Authority: CN
Inventors: 张重阳; 蒋谦谦; 赵成兵
Original assignee: Hebei Changrun Environmental Protection Technology Co ltd
Current assignee: Hebei Changrun Environmental Protection Technology Co ltd
Priority date: 2023-04-14
Filing date: 2023-04-14
Publication date: 2023-08-15
Anticipated expiration: 2033-04-14

Abstract

The utility model discloses a three-phase bridge circuit detection meter, which comprises: the number of the measuring ends is three, and the measuring ends are used for respectively introducing U, V, W three-phase power to be measured of the inverter circuit; the number of the measuring modules is six, two measuring modules are in a group, and each group of measuring modules is connected in parallel between the two measuring ends; the measuring modules comprise voltmeters and rectifier diodes which are connected in series, and the serial directions of the rectifier diodes in each group of two measuring modules are opposite. The three-phase bridge circuit detection table can rapidly judge the conduction condition of the IGBT or the thyristor in the corresponding inverter circuit, thereby reducing the fault searching range and lowering the maintenance difficulty.

Description

Three-phase bridge circuit detection meter

Technical Field

The utility model relates to the technical field of electrical overhaul, in particular to a three-phase bridge circuit detection meter.

Background

The main power elements in the current frequency converter, soft starter, SVG reactive power regulation equipment, inverter and other equipment are all composed of three-phase bridge type inverter circuits composed of IGBT or thyristors, and the three-phase bridge type inverter circuits are used as main transmission components of power, have large bearing current and high heating capacity and are vulnerable components in the equipment. Because the three-phase bridge inverter circuit is connected in series in the whole circuit, under the condition that the measured circuit is not physically isolated, the static measurement is difficult to locate the fault point, so that an electrified measurement method is generally adopted. In the traditional live measurement method, a universal meter is required to be used for independently measuring the conduction condition of each transistor, the measurement steps are complicated, the danger coefficient is large, and particularly in high-voltage equipment maintenance, once improper measurement is extremely easy to cause personnel electric shock or equipment short circuit, the safety of maintenance personnel is endangered, and the secondary fault loss of equipment is enlarged.

Therefore, there is a need to develop a three-phase bridge circuit detection table against the above-described problems.

Disclosure of Invention

The utility model aims to provide a three-phase bridge circuit detection table which can rapidly judge the conduction condition of an IGBT or a thyristor in a corresponding inverter circuit, thereby reducing the fault searching range and the maintenance difficulty.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model relates to a three-phase bridge circuit detection meter, which comprises:

the number of the measuring ends is three, and the measuring ends are used for respectively introducing U, V, W three-phase power to be measured of the inverter circuit;

the number of the measuring modules is six, two measuring modules are in a group, and each group of measuring modules is connected in parallel between the two measuring ends; the measuring modules comprise voltmeters and rectifier diodes which are connected in series, and the serial directions of the rectifier diodes in each group of two measuring modules are opposite.

Further, the measuring end further comprises an alligator clip, and the alligator clip is connected to the end position of the measuring end.

Further, the measuring end further comprises a spiral wire which is connected in series between the end head of the measuring end and the tail wiring end of the crocodile clip.

Further, the measuring module further comprises a current limiting resistor, and the current limiting resistor is connected in series between the voltmeter and the rectifier diode.

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

according to the three-phase bridge circuit detection meter, the bridge measurement circuit is formed by six rectifier diodes and is connected with the voltmeter in series, so that the voltage in the corresponding loop can be measured, the fault point can be rapidly determined by visual reading and voltage value comparison, and the overhaul difficulty is reduced.

In addition, through the arrangement of the crocodile clip, the measuring end is conveniently connected with an output lead of the inversion module of the tested equipment; through helical wire's setting, be convenient for pull and realize quick connect, strong adaptability. The current limiting resistor is connected in series in the measuring module, so that a fault voltmeter can be protected, and short-circuit safety accidents are avoided.

Drawings

The utility model is further described with reference to the following description of the drawings.

FIG. 1 is an electrical schematic diagram of a three-phase bridge circuit test meter according to the present utility model.

Reference numerals illustrate: 100. a measurement module; 101. a voltmeter; 102. a rectifier diode; 200. a measuring end; 201. crocodile clips; 202. a helical wire.

Detailed Description

The utility model provides a three-phase bridge circuit detection table, which can rapidly judge the conduction condition of an IGBT or a thyristor in a corresponding inverter circuit, thereby reducing the fault searching range and the maintenance difficulty.

The following description of the embodiments of the present utility model will be made in detail with reference to the accompanying drawings, wherein it is apparent that the embodiments described are only some, but not all embodiments of the utility model. 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, in the present document, relational terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In one embodiment, the three-phase bridge circuit detection table of the present utility model, as shown in fig. 1, comprises: the number of the measuring terminals 200 is three and the measuring terminals 200 are used for respectively introducing U, V, W three-phase power which needs to be measured for the inverter circuit.

The number of the measuring modules 100 is six, two measuring modules 100 are in a group, and two measuring modules 100 of each group are connected in parallel between two measuring ends 200. I.e. UV, VW and WU, respectively, are connected in parallel with a set of measurement modules 100. The measuring modules 100 comprise voltmeters 101 and rectifier diodes 102 connected in series, and the series connection directions of the rectifier diodes 102 in each group of two measuring modules 100 are opposite. The rectifier diode 102 is a high-frequency diode, and the voltmeter 101 is a dc voltmeter.

It should be noted that the connection mode in fig. 1 is only a specific connection mode of the present embodiment, and a simple modification mode is implemented by changing the serial connection position of the rectifying diode 102, which falls within the protection scope of the present utility model, and the present utility model should not be construed as being limited by the protection scope of the present utility model.

The instrument is special for checking and maintaining IGBT or thyristor of frequency converter, inverter unit, soft starter output and other equipment. When the three-phase six-bridge voltmeter U, V and the W measuring end 200 are connected to the three-phase output end of the testing device, the voltages of the six voltmeters 101 are the same, and the inversion module of the tested device is normal. If a certain voltmeter 101 is not displayed, the voltage value is lower, and the voltage value is higher, the corresponding transistor fault or the transistor trigger control loop fault in the inverter circuit of the tested equipment can be caused.

The bridge type measuring circuit is formed by six rectifying diodes 102 and is connected with the voltmeter 101 in series, so that the voltage in the corresponding loop can be measured, the fault point can be quickly determined by visual reading and voltage value comparison, and the overhaul difficulty is reduced.

In one embodiment, as shown in FIG. 1, the measurement tip 200 further includes a crocodile clip 201, the crocodile clip 201 being attached to the tip position of the measurement tip 200.

Specifically, as shown in fig. 1, the measurement tip 200 further includes a helical wire 202, the helical wire 202 being serially connected between the tip of the measurement tip 200 and the tail terminal of the alligator clip 201. The spiral wire 202 is a copper core premium wire of 2.5 square millimeters.

The crocodile clip 201 is arranged, so that the measuring end 200 is conveniently connected with an output lead of the inversion module of the tested equipment; through the setting of helical wire 202, be convenient for pull and realize quick connect, the adaptability is strong.

In a specific embodiment, the measurement module 100 further comprises a current limiting resistor connected in series between the voltmeter 101 and the rectifier diode 102. The resistance value of the current limiting resistor is 2MΩ.

The current limiting resistor is connected in series in the measurement module 100, so that the fault voltmeter 101 can be protected, and short-circuit safety accidents can be avoided.

In a specific embodiment, the crocodile clip 201 of the measuring end 200 is provided with a label on which the indicia U, V and the W indicia are distinguished.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.

The above embodiments are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model should fall within the protection scope defined by the claims of the present utility model without departing from the design spirit of the present utility model.

Claims

1. A three-phase bridge circuit test meter, comprising:

the measuring terminals (200) are three in number and are used for respectively introducing U, V, W three-phase power to be measured of the inverter circuit;

the number of the measuring modules (100) is six, two measuring modules (100) are in a group, and each group of measuring modules (100) is connected between two measuring ends (200) in parallel; the measuring modules (100) comprise voltmeters (101) and rectifying diodes (102) which are connected in series, and the series connection directions of the rectifying diodes (102) in the two measuring modules (100) of each group are opposite.

2. The three-phase bridge circuit test meter of claim 1, wherein: the measuring end (200) further comprises an alligator clip (201), wherein the alligator clip (201) is connected to the end position of the measuring end (200).

3. The three-phase bridge circuit test meter of claim 2, wherein: the measuring end (200) further comprises a spiral wire (202), and the spiral wire (202) is connected in series between the end of the measuring end (200) and the tail terminal of the crocodile clip (201).

4. A three-phase bridge circuit detection table according to any one of claims 1 to 3, wherein: the measurement module (100) further comprises a current limiting resistor connected in series between the voltmeter (101) and the rectifier diode (102).