CN112965401B - Large-current control device and method for transformer fireproof and explosion-proof physical check test - Google Patents
Large-current control device and method for transformer fireproof and explosion-proof physical check test Download PDFInfo
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- CN112965401B CN112965401B CN202110169869.9A CN202110169869A CN112965401B CN 112965401 B CN112965401 B CN 112965401B CN 202110169869 A CN202110169869 A CN 202110169869A CN 112965401 B CN112965401 B CN 112965401B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
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- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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
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 fire-proof and explosion-proof physical check test of a transformer.
Background
In the process of short circuit fault inside the transformer body, gas generation caused by electric arc and bubble form pulsation are main reasons causing oil pressure rise and cavity fracture. In order to verify the fireproof and explosion-proof capacity of the tested transformer, a physical simulation test of artificial large-current arc faults inside a tested product is required.
The breaking capacity of an arc extinguish chamber of a current controller running on the existing power grid is difficult to exceed 63kA, but some large-current test stations have special requirements and need frequent large-current breaking tests, so that a device for breaking larger short-circuit current capacity is very urgent to develop.
On the premise of not improving the prior art of the current controller, the direct parallel connection of a plurality of arc extinguish chambers is the simplest method, all contacts are controlled to act simultaneously mainly through a set of mechanical transmission device, the closing and opening time is still asynchronous, the problem can only be solved through fine adjustment of a mechanical structure, the actual effect of the mode of fine adjustment of the positions of the contacts by the mechanical structure is not ideal due to the limitation of conditions, the synchronization performance is reduced to some extent after the current controller runs for a certain time, certain potential safety hazards exist, and the special requirement of a large-current test station on the frequent operation stability of the current controller cannot be met.
Disclosure of Invention
Aiming at the problems, the invention provides a large-current control device and a large-current control method for a transformer fire and explosion protection physical check test, aiming at improving the current carrying capacity and the short-circuit current breaking capacity of a current controller so as to improve the fire and explosion protection capacity of a transformer.
In order to solve the above technical problems, the present invention provides a high current control device for a physical fire and explosion protection verification test of a transformer, comprising,
the current controllers are connected in parallel with the fracture among 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 provides a large current control method for the fire and explosion protection physical check test of the transformer on the other hand, which is used for the large current control device for the fire and explosion protection physical check test of the transformer and comprises the following steps,
respectively controlling the switching on/off of each current controller through a preset action time sequence and a preset delay time;
collecting a position switch signal of each current controller, wherein the position switch signal comprises an action time difference from the time when the current controller receives the preset action time sequence and the preset delay time to the time when the current switching-on/switching-off is completed;
and performing centralized operation on the action time difference, and correcting the preset delay time.
In some embodiments, the centralized operation is specifically: and calculating the average value of the action time difference.
In some embodiments, the modification is in particular: and calculating a corrected value by subtracting the average value from the closing/opening completion time of the time, and adding the corrected value to the preset delay time of the closing/opening of the time to be used as the preset delay time of the next closing/opening.
In some embodiments, the preset action timing and the preset delay time corresponding to the first time of each current controller are the same.
In some embodiments, the preset action sequence is a level output sequence required for controlling the switching on/off of the current controller, and the preset delay time is a duration time of the level output.
In some embodiments, further comprising, performing the steps in a loop.
The beneficial effects of the invention are as follows: the current controller is utilized, the current carrying capacity and the short-circuit current breaking capacity of the current controller are improved in multiples by the parallel connection of the current controller arc extinguish chambers, the synchronous control device can realize extremely high synchronous performance, the high precision and the automatic error correction of the synchronous control device ensure the stability and the precision of the control of the synchronous control device, and the synchronous control device has higher reliability and stability compared with mechanical linkage.
Drawings
Fig. 1 is a schematic connection diagram of a large-current control device for a fire and explosion protection physical verification test of a transformer according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a large-current control method for a fire and explosion protection physical verification test of a transformer disclosed in the second embodiment of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the following detailed description of the present invention is provided with reference to the accompanying drawings and detailed description. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.
The embodiment provides a large current control device for a fire and explosion protection physical check test of a transformer, which comprises,
the current controllers are connected in parallel with the fracture among 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.
In the present 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 one fracture, and this is taken as an example. The closing coil and the opening coil of the two current controllers are connected with the output control port of the synchronous control device 3, and the position switches of the two current controllers are respectively connected with the input port of the synchronous control device 3.
The invention is used for improving the current carrying capacity and the short-circuit current breaking capacity of the current controllers in multiples by connecting the arc extinguish chamber fractures of the current controllers in parallel, and has simple structure and reliable function.
As shown in fig. 2, this embodiment provides a large current control method for a physical fire and explosion protection verification test of a transformer, which is used for the large current control device for the physical fire and explosion protection verification test of the transformer, and includes the following steps,
step one, respectively controlling the switching-on/switching-off of each current controller through a preset action time sequence and a preset delay time so as to achieve the purpose of simultaneous switching-on and switching-off.
In this embodiment, the preset action timing and the preset delay time corresponding to the first time of each current controller are the same. The preset action time sequence is a level output sequence required for controlling the switching-on/switching-off of the current controller, and the preset delay time is the duration time of level output. Before the initial closing/opening, the present embodiment sets the same preset action timing and preset delay time for each current controller, and aims to assume that there is no performance difference between each current controller and each current controller is in an ideal state.
And step two, collecting a position switch signal of each current controller, wherein the position switch signal comprises an action time difference from the time when the current controller receives a preset action time sequence and a preset delay time to the time when the current closing/opening is completed.
In this embodiment, the centralized operation specifically includes: the average value of the motion time difference is obtained. The correction is specifically as follows: and calculating a correction value by taking the difference between the average value and the closing/opening completion time of the current time, and adding the correction value and the preset delay time of the current closing/opening to be used as the preset delay time of the next closing/opening. The corrected delay time is used as the preset delay time of the next switching-on/switching-off, and the action time difference between the two current controllers can be integrally adjusted. In the present embodiment, two current controllers are used as an illustration, but in practice, the greater the number of current controllers, the more likely it is to obtain the optimum preset delay time. Under the ideal condition, namely, under the condition that the opening and closing times are not limited, the final correction value approaches to 0, and the opening and closing time of the current controller approaches to stability. For the current controller of the model, the correction process of the second step and the third step can be abandoned, and the corrected preset delay time and the action time sequence are directly adopted for control.
And step three, performing centralized operation on the action time difference, and correcting the preset delay time.
As still another preferred embodiment of the present invention, the above-mentioned steps one to three are performed cyclically. Through the on-off operation of the current controllers 1 and 2, the synchronizer 3 can automatically acquire action return signals, automatically calculate action time difference according to a plurality of recording results and correct the action time difference, and the synchronization effect is better along with the increase of the operation times of each current controller. In a word, the method provided by the invention can greatly reduce the research and development cost of the high-current controller. The current controller is utilized, the current carrying capacity and the short-circuit current breaking capacity of the current controller are improved in multiples through the parallel connection of the current controller arc extinguish chambers, the synchronous control device can achieve extremely high synchronous performance, the high precision and the automatic error correction of the synchronous control device ensure the stability and the precision of the control, and the synchronous control device has higher reliability and stability compared with mechanical linkage. Therefore, the invention has great economic value.
Furthermore, the invention has high flexibility, can adjust the delay time at any time according to the requirement, is convenient to operate, and can realize the special requirement of closing at any angle.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes and modifications made according to the spirit of the present disclosure should be covered within the scope of the present disclosure.
Claims (4)
1. A large current control method for a transformer fireproof and explosion-proof physical check test is used for a large current control device for the transformer fireproof and explosion-proof physical check test, wherein the large current control device for the transformer fireproof and explosion-proof physical check test comprises a plurality of current controllers which are connected in parallel with fractures among the current controllers; a synchronous control device, an output control port of the synchronous control device is connected with a closing coil and an opening coil of each current controller, an input port of the synchronous control device is connected with a position switch of each current controller, the synchronous control device is characterized by comprising the following steps,
respectively controlling the closing/opening of each current controller through a preset action time sequence and a preset delay time;
collecting a position switch signal of each current controller, wherein the position switch signal comprises an action time difference from the time when the current controller receives the preset action time sequence and the preset delay time to the time when the current switching-on/switching-off is completed;
performing centralized operation on the action time difference, and correcting the preset delay time;
the centralized operation specifically comprises: calculating the average value of the action time difference;
the correction is specifically as follows: and calculating a corrected value by subtracting the average value from the closing/opening completion time of the time, and adding the corrected value to the preset delay time of the closing/opening of the time to be used as the preset delay time of the next closing/opening.
2. The method for controlling the large current for the physical fire and explosion protection verification test of the transformer according to claim 1, wherein the preset action time sequence and the preset delay time corresponding to each current controller for the first time are the same.
3. The method for controlling the large current for the physical fire and explosion protection verification test of the transformer according to claim 1, wherein the preset action sequence is a level output sequence required for controlling the switching on/off of the current controller, and the preset delay time is a duration time of the level output.
4. The method for controlling large current for physical fire and explosion protection verification tests of transformers according to claim 1, further comprising performing the steps in a cyclic manner.
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| CN1234140C (en) * | 2001-11-05 | 2005-12-28 | 刘卫歧 | Cutoff Switch |
| JP5159075B2 (en) * | 2006-09-25 | 2013-03-06 | 株式会社東芝 | Circuit breaker switching control device |
| CN103489702B (en) * | 2013-09-05 | 2015-09-09 | 瑞亿智能控制设备（深圳）有限公司 | The circuit breaker open/closure controller detected based on optoelectronic position and control method thereof |
| CN103545133A (en) * | 2013-09-27 | 2014-01-29 | 国家电网公司 | High-voltage alternating-current phased circuit breaker and control method of switching on/off phase selection |
| CN110556267B (en) * | 2019-10-12 | 2021-08-31 | 福州大学 | Self-adaptive synchronous control method of parallel three-phase alternating current contactor |
| CN110718418B (en) * | 2019-10-24 | 2021-09-28 | 福州大学 | Switch parallel capacity expansion operation control method based on single-pole contactor |
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