CN112965401B - Large-current control device and method for transformer fireproof and explosion-proof physical check test - Google Patents

Abstract

The invention discloses a large current control device and a method for a fire-proof and explosion-proof physical check test of a transformer, wherein the large current control device comprises a plurality of current controllers and a fracture which is connected in parallel between the current controllers; and an output control port of the synchronous control device is connected with the closing coil and the opening coil of each current controller, and an input port of the synchronous control device is connected with the position switch of each current controller. The invention utilizes the existing current controller, improves the current carrying capacity and the short circuit current breaking capacity of the current controller by times through the parallel connection of the current controller arc extinguish chambers, can realize extremely high synchronization performance by the synchronous control device, ensures the stability and the accuracy of the control by the high precision and the automatic error correction, and has higher reliability and stability compared with mechanical linkage.

Description

High-current control device and method for physical verification test of transformer fire and explosion protection

technical field

The invention relates to the technical field of high-voltage current controllers, in particular to a high-current control device and method for a physical verification test of fire and explosion protection of transformers.

Background technique

During the internal short-circuit fault of the transformer body, the gas generation and the pulsation of the bubble shape caused by the arc are the main reasons for the increase of oil pressure and the rupture of the cavity. In order to verify the fire-proof and explosion-proof capability of the tested transformer, a physical simulation test of artificial high-current arc fault inside the tested product is required.

The interrupting capacity of the interrupter of the current controller running on the existing power grid is difficult to exceed 63kA, but some high-current test stations have special requirements, and frequent high-current interrupting tests are required, so the development of larger interrupting capacity The short-circuit current capability of the device is very urgent.

On the premise of not improving the existing technology of the current controller, it is the easiest way to directly connect multiple arc extinguishing chambers in parallel. It mainly controls the simultaneous action of all contacts through a set of mechanical transmission devices, but the closing and opening times are still not synchronized. It can only be solved by fine-tuning the mechanical structure. Due to limited conditions, the actual effect of fine-tuning the contact position of the mechanical structure is not ideal, and after running for a certain period of time, its synchronization performance will decline, there are certain safety hazards, and it cannot meet the high current test. The station has special requirements for the stability of the frequent operation of the current controller.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention proposes a large current control device and method for physical verification test of transformer fire and explosion protection, aiming at improving the current carrying capacity and short circuit current breaking capacity of the current controller, so as to improve the fire protection and explosion protection capability of the transformer.

In order to solve the above-mentioned technical problems, one aspect of the present invention proposes a high-current control device for a physical verification test of a transformer against fire and explosion, comprising:

a plurality of current controllers, connected in parallel with the fractures between the current controllers;

A synchronous control device, the output control port of the synchronous control device is connected with the closing coil and the opening coil of each of the current controllers, and the input port of the synchronous control device is connected with the position switch of each of the current controllers connect.

Another aspect of the present invention proposes a high-current control method for a fire-proof and explosion-proof physical check test of a transformer, which is used for the above-mentioned high-current control device for a fire-proof and explosion-proof physical check test of a transformer, comprising the following steps:

Through the preset action sequence and preset delay time, respectively control the closing/opening of each of the current controllers;

Collecting a position switch signal of each of the current controllers, where the position switch signal includes the action time difference of the current controller from receiving the preset action sequence and preset delay time to the closing/opening completion time of this time;

Perform centralized operation on the action time difference to correct the preset delay time.

In some embodiments, the centralized operation is specifically: obtaining an average value of the movement time differences.

In some embodiments, the correction is specifically as follows: making a difference between the average value and the closing/opening completion time of the current time, calculating a correction value, and comparing the correction value with the preset closing/opening time of the current time. Set the delay time to add up as the preset delay time for the next closing/opening.

In some embodiments, the preset action sequence and the preset delay time corresponding to each of the current controllers for the first time are the same.

In some embodiments, the preset action sequence is a level output sequence required to control closing/opening of the current controller, and the preset delay time is the duration of the level output.

In some embodiments, it also includes performing the steps in a loop.

The beneficial effects of the present invention are: using the existing current controller, through the parallel connection of the arc extinguishing chambers of the current controller, the current carrying capacity and the short-circuit current breaking capacity of the current controller can be doubled, and the synchronous control device can achieve extremely high Its high-precision and automatic error correction ensure the stability and accuracy of its control, and it has higher reliability and stability than mechanical linkage.

Description of drawings

Fig. 1 is the connection schematic diagram of the high-current control device for the physical verification test of the transformer fireproof and explosion-proof disclosed in the first embodiment of the present invention;

FIG. 2 is a schematic flowchart of a large current control method for a physical check test for fire and explosion protection of a transformer disclosed in Embodiment 2 of the present invention;

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer and clearer, the content of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all of the contents related to the present invention.

This embodiment proposes a high-current control device for a physical check test of a transformer against fire and explosion, including:

Several current controllers, the fracture between the parallel current controllers;

A synchronous control device, the output control port of the synchronous control device is connected with the closing coil and the opening coil of each current controller, and the input port of the synchronous control device is connected with the position switch of each of the current controllers.

In this embodiment, as shown in FIG. 1 , the fracture of the current controller 1 and the fracture of the current controller 2 are connected in parallel and used as a fracture, and are used as an example. The closing coils and the opening coils of the two current controllers are connected to the output control ports of the synchronous control device 3 , and the position switches of the two current controllers are respectively connected to the input ports of the synchronous control device 3 .

The invention is used to multiply the current carrying capacity and short-circuit current breaking capacity of the current controller by connecting the arc-extinguishing chamber fractures of a plurality of current controllers in parallel, and has simple structure and reliable function.

As shown in Figure 2, the present embodiment proposes a high-current control method for a transformer fire-proof and explosion-proof physical check test, which is used for the high-current control device for the above-mentioned transformer fire-proof and explosion-proof physical check test, including the following steps:

In step 1, the closing/opening of each current controller is controlled respectively through the preset action sequence and the preset delay time, so as to achieve the purpose of turning on and off at the same time.

In this embodiment, the preset action sequence and preset delay time corresponding to each current controller for the first time are the same. The preset action sequence is the level output sequence required to control the closing/opening of the current controller, and the preset delay time is the duration of the level output. Before closing/opening for the first time, this embodiment sets the same preset action sequence and preset delay time for each current controller. The purpose is to assume that there is no performance difference between each current controller. Each current controller is ideal.

Step 2: Collect the position switch signal of each current controller. The position switch signal includes the action time difference from the current controller receiving the preset action sequence and the preset delay time to the closing/opening completion time.

In this embodiment, the above-mentioned centralized operation is specifically: obtaining the average value of the action time difference. The correction is as follows: make the difference between the average value and the completion time of this closing/opening, calculate the correction value, and add the correction value to the preset delay time of this closing/opening, as the next closing/opening time. The preset delay time used for opening. The corrected delay time is used as the preset delay time of the next closing/opening, which is beneficial to the overall adjustment of the action time difference between the two current controllers. In this embodiment, two current controllers are used for illustration, but in fact, the more current controllers there are, the more likely it is to obtain the best preset delay time. In an ideal state, that is, when the number of times of switching is unlimited, the final correction value will be close to 0, and the breaking time of the current controller will be stable. For this type of current controller, the correction process of steps 2 and 3 can also be abandoned, and the corrected preset delay time plus the action sequence can be directly controlled.

Step 3: Perform centralized operation on the movement time difference to correct the preset delay time.

As another preferred embodiment of the present invention, the above steps 1 to 3 are performed cyclically. Through the opening and closing operation of the current controller 1 and the current controller 2, the synchronization device 3 will automatically collect the action return signal, and automatically calculate the action time difference according to the multiple recording results to correct it. The synchronization effect will be better. In a word, the research and development cost of the high-current current controller can be greatly reduced by using the method provided by the present invention. By using the existing current controller and paralleling the arc extinguishing chambers of the current controller to double the current carrying capacity and short-circuit current breaking capacity of the current controller, the synchronous control device can achieve extremely high synchronous performance, and its high The automatic correction of precision and error ensures the stability and accuracy of its control, which has higher reliability and stability than mechanical linkage. Therefore, the present invention has great economic value.

Furthermore, the present invention has a high degree of flexibility, the delay time can be adjusted at any time according to the needs, the operation is convenient, and the special requirement of closing the switch at any angle can be realized.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and the purpose thereof is to enable those of ordinary skill in the art to understand the content of the present invention and implement them accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the essence of the present invention shall be included within the protection scope of the present invention.

Claims (4)

1. A high-current control method for a fire-proof and explosion-proof physical check test of a transformer, used for a high-current control device for a fire-proof and explosion-proof physical check test of a transformer, and the high-current control device for a fire-proof and explosion-proof physical check test of a transformer includes several currents a controller, connected in parallel with the fracture between the current controllers; a synchronous control device, the output control port of the synchronous control device is connected with the closing coil and the opening coil of each of the current controllers, the synchronous control device The input port is connected with the position switch of each said current controller, and it is characterized in that, comprises the following steps, Through the preset action sequence and preset delay time, respectively control the closing/opening of each of the current controllers; Collecting a position switch signal of each of the current controllers, where the position switch signal includes the action time difference of the current controller from receiving the preset action sequence and preset delay time to the closing/opening completion time of this time; Perform a centralized operation on the action time difference to correct the preset delay time; The centralized operation is specifically: obtaining the average value of the movement time difference; The correction is specifically: making the difference between the average value and the closing/opening completion time of this time, calculating a correction value, and adding the correction value to the preset delay time of the closing/opening this time, The preset delay time used as the next closing/opening. 2 . The high-current control method for a physical verification test of a transformer against fire and explosion protection according to claim 1 , wherein the preset action sequence and the preset delay time corresponding to each of the current controllers for the first time are the same. 3 . 3. The high-current control method for the physical verification test of fire-proof and explosion-proof transformers as claimed in claim 1, wherein the preset action sequence is the level output sequence required for the closing/opening of the control current controller, The preset delay time is the duration of the level output. 4 . The high-current control method for a physical verification test of fire and explosion protection of a transformer according to claim 1 , further comprising: cyclically executing the steps. 5 .

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