CN108828305A - A kind of transformer iron core grounding current measuring device - Google Patents

Abstract

The present application discloses a transformer core ground current measuring device, comprising: a current acquisition module, used to maintain connection with the ground wire of the transformer core and collect current information of the ground wire; a display module, connected to the current acquisition module connection for displaying the current information. The transformer iron core grounding current measuring device is kept connected with the grounding wire of the transformer iron core through the current acquisition module, and collects the current information of the grounding wire in real time, and finally displays the current information in real time through the display module. Therefore, it is not necessary for inspectors to carry out regular inspections, but inspectors only need to observe the current information displayed on the display module at any time to judge whether the ground current of the transformer core exceeds the specified value. Compared with the existing detection methods, the ground current can be detected in real time , find out whether the ground current exceeds the specified value in time, and simplify the detection operation.

Description

A transformer core ground current measuring device

technical field

The invention relates to the technical field of transformer detection, in particular to a transformer iron core ground current measurement device.

Background technique

When the transformer is working normally, the charged coil and wire will cause the electric field inside the transformer to be uneven, and the transformer core and metal parts are also in the electric field. The internal electric field of the transformer is in a non-uniform state. Not only the shape of the power line is special, but also the potential difference of each point is relatively large. The iron core and other metal parts have different potentials because of different positions. When the potential difference reaches the breakdown voltage, spark discharge will occur, and the discharge will accelerate the damage of transformer oil and solid insulation. If it develops for a long time, accidents will occur.

In order to avoid the above situation, the iron core and other metal parts must be connected with the fuel tank and grounded, and only one point is grounded so that they are at zero potential. Under normal circumstances, the ground current is very small, about tens of milliamperes. However, when there are more than two grounding points in the iron core, a loop will be formed between the iron core and the earth, and the grounding current will increase many times at this time, causing potential safety hazards. Therefore, in the current substation operation, the staff need to carry out live detection work regularly, that is, use an ammeter to measure whether the iron core grounding current exceeds the specified value.

However, it is cumbersome to regularly measure the ground current of the transformer core, and it is impossible to find out whether the ground current exceeds the specified value in time.

Contents of the invention

In view of this, the object of the present invention is to provide a transformer core ground current measuring device to detect the ground current of the transformer core in real time and simplify the detection operation of the ground current.

To achieve the above object, the present invention provides the following technical solutions:

A transformer core ground current measuring device, comprising:

A current collection module, configured to keep connected to the ground wire of the transformer core and collect current information of the ground wire;

A display module, connected to the current acquisition module, for displaying the current information.

Preferably, in the above transformer core ground current measurement device, the current acquisition module includes:

An AC leakage current sensor, configured to keep connected to the ground wire and collect a current signal of the ground wire, and output a voltage signal;

An A/D conversion module, connected to the AC leakage current sensor, for converting the voltage signal into a digital signal;

A processing module is connected to both the A/D conversion module and the display module, the processing module calculates the current information according to the digital signal, and transmits the current information to the display module.

Preferably, in the above transformer core ground current measuring device, the AC leakage current sensor is an open type AC leakage current sensor.

Preferably, in the above-mentioned transformer core ground current measuring device, the processing module is a single-chip microcomputer, PLC or computer.

Preferably, in the above transformer core ground current measurement device, a power supply module connected to the current collection module is further included.

Preferably, in the above transformer core ground current measuring device, the power supply module is a battery or an AC power supply.

Preferably, in the above transformer core ground current measuring device, a prompting module connected to the current collection module is further included, and the prompting module is used to prompt when the current information exceeds a set current value.

Preferably, in the above-mentioned transformer core grounding current measuring device, the set current value is any value in the range of 90mA-110mA.

Preferably, in the above transformer core ground current measuring device, the prompt module includes a sound prompt unit and/or a light prompt unit.

Preferably, in the above transformer core ground current measuring device, the prompt module is a warning light with sound prompt function.

Compared with prior art, the beneficial effect of the present invention is:

The transformer iron core grounding current measurement device provided by the present invention is kept connected with the grounding wire of the transformer iron core through the current acquisition module, collects the current information of the grounding wire in real time, and finally displays the current information in real time through the display module. Therefore, it is not necessary for inspectors to carry out regular inspections, but inspectors only need to observe the current information displayed on the display module at any time to judge whether the ground current of the transformer core exceeds the specified value. Compared with the existing detection methods, the ground current can be detected in real time , find out whether the ground current exceeds the specified value in time, and simplify the detection operation.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a schematic structural diagram of a transformer core ground current measuring device provided by an embodiment of the present invention;

Fig. 2 is a structural schematic diagram of another transformer core ground current measuring device provided by an embodiment of the present invention;

Fig. 3 is a structural schematic diagram of another transformer core ground current measuring device provided by an embodiment of the present invention.

Detailed ways

The core of the invention is to provide a transformer core ground current measuring device, which can detect the ground current of the transformer core in real time and simplifies the detection operation of the ground current.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 1, the embodiment of the present invention provides a transformer iron core grounding current measurement device, hereinafter referred to as the measurement device, which includes a current acquisition module 1 and a display module 2, wherein the current acquisition module 1 is used to communicate with the transformer iron core The ground wire remains connected, and the current information of the ground wire is collected, that is, the current acquisition module 1 is always connected to the ground wire; the display module 2 is connected to the current acquisition module 1 for displaying the current information collected by the current acquisition module 1 .

When the measuring device is working, the current acquisition module 1 is kept connected to the ground wire of the transformer core, the current acquisition module 1 collects the current information of the ground wire in real time, and finally displays the current information in real time through the display module 2 . Therefore, there is no need for inspectors to conduct regular inspections, and only the inspectors need to observe the current information displayed on the display module 2 at any time can judge whether the grounding current of the transformer core exceeds the specified value. Compared with the existing detection methods, it is possible to detect the grounding in real time Current, find out whether the ground current exceeds the specified value in time, and simplify the detection operation.

As shown in Figure 2, the embodiment of the present invention provides a specific current acquisition module 1, the current acquisition module 1 includes an AC leakage current sensor 11, an A/D conversion module 12 and a processing module 13, wherein the AC leakage current sensor 11 is used to keep connected with the ground wire, and collect the current signal of the ground wire, convert the current signal into a voltage signal and output it; the A/D conversion module 12 is connected with the AC leakage current sensor 11, and is used to output the AC leakage current sensor 11 The voltage signal is converted into a digital signal; the processing module 13 is connected to the A/D conversion module 12 and the display module 2, and the processing module 13 calculates the current information corresponding to the detection result according to the digital signal converted by the A/D conversion module 12, and The current information is transmitted to the display module 2 for display.

The current signal of the ground wire can be detected in real time by using the AC leakage current sensor 11 .

Further, in this embodiment, the AC leakage current sensor 11 is an open type AC leakage current sensor. The open-type AC leakage current sensor can be opened, and the grounding wire can be directly clamped to realize the connection with the grounding wire. It is not necessary to put the grounding wire into the open-type AC leakage current sensor, which is convenient for detection. Of course, the AC leakage current sensor 11 can also be a closed type AC leakage current sensor, but the grounding wire needs to be inserted into the closed type AC leakage current sensor, and the operation is not as convenient as the open type.

In this embodiment, the processing module 13 is a single chip microcomputer, a PLC or a computer, as long as it can realize input, output and calculation functions.

As shown in FIG. 2 , the measurement device in this embodiment further includes a power supply module 3 connected to the current acquisition module 1 , specifically, the power supply module 3 is connected to both the AC leakage current sensor 11 and the processing module 13 for power supply.

As an optimization, in this embodiment, the power supply module 13 is a battery or an AC power supply, which supplies power to the current acquisition module 1 through the battery, or directly supplies power to the current acquisition module 1 through the AC power supply.

As shown in Figure 3, in this embodiment, the measurement device also includes a prompt module 4 connected to the current acquisition module 1. When the current information exceeds the set current value, the prompt module 4 will prompt to prompt the testing personnel to find the problem in time and carry out follow-up work.

As an optimization, in this embodiment, the set current value is any value from 90 mA to 110 mA, and the set current value is usually set to 100 mA.

As an optimization, the prompting module 4 includes a sound prompting unit and/or a light prompting unit, that is, the prompting module 4 may separately include a sound prompting unit, which only prompts through sound, or may separately include a light prompt unit, which only prompts through lights, or At the same time, it includes a sound prompt unit and a light prompt unit, and prompts through sound and light at the same time.

Specifically, the prompt module 4 is an alarm lamp with a sound prompt function, and the alarm lamp flashes or emits light to prompt while sounding an alarm.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A transformer iron core ground current measuring device, characterized in that, comprising: A current collection module, configured to keep connected to the ground wire of the transformer core and collect current information of the ground wire; A display module, connected to the current acquisition module, for displaying the current information. 2. The transformer iron core ground current measuring device according to claim 1, wherein the current acquisition module comprises: An AC leakage current sensor, configured to keep connected to the ground wire and collect a current signal of the ground wire, and output a voltage signal; An A/D conversion module, connected to the AC leakage current sensor, for converting the voltage signal into a digital signal; A processing module is connected to both the A/D conversion module and the display module, the processing module calculates the current information according to the digital signal, and transmits the current information to the display module. 3 . The transformer core ground current measuring device according to claim 2 , wherein the AC leakage current sensor is an open type AC leakage current sensor. 4 . 4. The transformer iron core ground current measuring device according to claim 2, characterized in that, the processing module is a single-chip microcomputer, PLC or computer. 5. The transformer core ground current measuring device according to any one of claims 1-4, further comprising a power supply module connected to the current collection module. 6 . The transformer core ground current measuring device according to claim 5 , wherein the power supply module is a battery or an AC power supply. 7. The transformer core grounding current measuring device according to any one of claims 1-4, further comprising a prompt module connected to the current acquisition module, for when the current information exceeds the set current value, the prompt module will prompt. 8 . The transformer core ground current measuring device according to claim 7 , wherein the set current value is any one of 90mA˜110mA. 9 . The transformer core ground current measuring device according to claim 7 , wherein the prompt module includes a sound prompt unit and/or a light prompt unit. 10 . 10 . The transformer core ground current measuring device according to claim 10 , wherein the prompt module is a warning light with sound prompt function. 11 .