CN212811270U - Dry-type air-core reactor turn-to-turn short circuit protection device based on power factor - Google Patents
Dry-type air-core reactor turn-to-turn short circuit protection device based on power factor Download PDFInfo
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- CN212811270U CN212811270U CN202021969636.4U CN202021969636U CN212811270U CN 212811270 U CN212811270 U CN 212811270U CN 202021969636 U CN202021969636 U CN 202021969636U CN 212811270 U CN212811270 U CN 212811270U
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Abstract
The utility model discloses a power factor-based turn-to-turn short circuit protection device for a dry-type air reactor, which comprises an analog signal conditioning unit, an A/D signal conversion unit, a central processing unit, a driving unit, a communication interface circuit and a human-computer interaction interface; the input end of the analog signal conditioning unit is used as the input end of the protection device and inputs phase voltage and phase current of the dry-type air-core reactor; the output end of the analog signal conditioning unit is connected with the input end of the central processing unit through the A/D signal conversion unit, the output end of the central processing unit is connected with the input end of the driving unit, and the output end of the driving unit is used as the output end of the protection device to output switching value; the man-machine interaction interface and the communication interface circuit are connected with the central processing unit. The utility model discloses increasing and establishing in the electric wire netting that uses dry-type air reactor, it has improved the sensitivity and the reliability of dry-type air reactor protection, can in time correctly act when the reactor takes place turn-to-turn short circuit fault, avoids the further extension of trouble.
Description
Technical Field
The utility model relates to a dry-type air-core reactor technical field, concretely relates to dry-type air-core reactor interturn short circuit protection device based on power factor.
Background
With the increasing operation of dry-type air-core reactors in a power grid, the situations of reactor faults are increased, especially after the reactor has turn-to-turn short circuit faults, the protection of the reactor cannot rapidly act to remove fault phases, so that the fault phases are burnt out by fire, and the protection cannot act until the turn-to-turn short circuit is enlarged and developed into relative ground or interphase short circuit or current is changed greatly, and the current is increased to an action threshold value. The reason why the operation is not performed but hysteresis operation is not sufficient, is mainly that when the reactor has an inter-turn short circuit fault, even if the current of the short circuit loop becomes very large, the current change of the phase current of the reactor is very slight in the conventional air-core reactor structure, while the current of the short circuit loop cannot be detected because the phase current of the reactor is detected in the two-stage overcurrent protection arranged in the reactor, and the phase current change value cannot reach the operation threshold of the protection, so that the protection cannot be performed naturally. Besides small phase current change, the voltage, inductance, magnetic field and other electric quantities of the dry-type air-core reactor are not obvious in change value during turn-to-turn short circuit fault, and the purpose of early warning is difficult to achieve by monitoring the dry-type air-core reactor.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that current dry-type air-core reactor has sensitivity and reliability not high in the use provides a dry-type air-core reactor interturn short-circuit protection device based on power factor.
In order to solve the above problems, the utility model discloses a realize through following technical scheme:
the power factor-based turn-to-turn short circuit protection device for the dry-type air reactor comprises an analog signal conditioning unit, an A/D signal conversion unit, a central processing unit, a driving unit, a communication interface circuit and a human-computer interaction interface; the input end of the analog signal conditioning unit is used as the input end of the protection device and inputs phase voltage and phase current of the dry-type air-core reactor; the output end of the analog signal conditioning unit is connected with the input end of the central processing unit through the A/D signal conversion unit, the output end of the central processing unit is connected with the input end of the driving unit, and the output end of the driving unit is used as the output end of the protection device to output switching value; the man-machine interaction interface and the communication interface circuit are connected with the central processing unit.
In the above scheme, the communication interface circuit includes an RS485 interface circuit, an RS232 interface circuit and/or a CAN interface circuit.
In the above scheme, the human-computer interaction interface is a touch screen.
In the scheme, one end of the communication interface circuit is connected with the central processing unit, and the other end of the communication interface circuit is connected with the upper computer.
Compared with the prior art, the utility model discloses increasing and establishing in the electric wire netting that uses dry-type air reactor, it has improved the sensitivity and the reliability of dry-type air reactor protection, can in time correctly act when the reactor takes place turn-to-turn short circuit fault, avoids the further extension of trouble.
Drawings
Fig. 1 is a schematic block diagram of a turn-to-turn short circuit protection device of a dry-type air-core reactor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that directional terms such as "upper", "lower", "middle", "left", "right", "front", "rear", and the like, referred to in the examples, refer only to the direction of the drawings. Accordingly, the directions used are for illustration only and are not intended to limit the scope of the present invention.
A power factor-based turn-to-turn short circuit protection device of a dry type air reactor is shown in figure 1 and comprises an analog signal conditioning unit, an A/D signal conversion unit, a central processing unit, a driving unit, a communication interface circuit and a man-machine interaction interface. In this embodiment, the communication interface circuit includes an RS485 interface circuit, an RS232 interface circuit and/or a CAN interface circuit; the human-computer interaction interface is a touch screen.
The input end of the analog signal conditioning unit is used as the input end of the protection device and inputs phase voltage and phase current of the dry-type air-core reactor. The output end of the analog signal conditioning unit is connected with the input end of the central processing unit through the A/D signal conversion unit, the output end of the central processing unit is connected with the input end of the driving unit, and the output end of the driving unit is used as the output end of the protection device to output the switching value. The man-machine interaction interface is connected with the central processing unit. One end of the communication interface circuit is connected with the central processing unit, and the other end of the communication interface circuit is connected with the upper computer.
And the analog signal conditioning unit acquires phase voltage and phase current of the dry air-core reactor. And the A/D signal conversion unit performs analog-to-digital conversion on the phase voltage and the phase current of the dry air reactor acquired by the analog signal conditioning unit and then sends the phase voltage and the phase current to the central processing unit. The central processing unit utilizes the analog phase voltage and the phase current to judge the turn-to-turn short circuit fault and outputs the switching value to drive the alarm device and/or the switch actuating mechanism when the turn-to-turn short circuit fault occurs. The man-machine interaction interface is used for setting system parameters and displaying operation parameters. The communication interface circuit is used for realizing the communication between the protection device and the upper computer and enabling the protection device and the upper computer to send and receive data.
The work process of the turn-to-turn short circuit protection device of the dry type air reactor based on the power factor is as follows:
step 1, after a dry-type air-core reactor is put into operation, phase voltage and phase current of the dry-type air-core reactor are simultaneously acquired in a period, and are sent to a central processing unit after being conditioned by an analog signal conditioning unit and subjected to analog-to-digital conversion by an A/D signal conversion unit; the central processing unit calculates a power factor by using the obtained phase voltage and phase current, and then stores the power factor as a current power factor reference value;
step 2, after a plurality of periods of continuous intervals, phase voltage and phase current of the dry-type air-core reactor are simultaneously acquired in one period, and are conditioned by the analog signal conditioning unit and sent to the central processing unit after analog-to-digital conversion is carried out by the A/D signal conversion unit; the central processing unit calculates a power factor by using the obtained phase voltage and phase current, and then takes the power factor as the current power factor;
step 3, the central processing unit calculates the ratio of the current power factor to the current power factor reference value, if the power factor ratio is larger than the set ratio threshold value of the power factor, the dry-type air-core reactor is judged to have the turn-to-turn short circuit fault, and a corresponding alarm signal and/or a cut-off signal are sent out through the driving unit; otherwise, replacing the current power factor reference value with the current power factor;
and 4, repeating the step 2 and the step 3 in the operation process of the dry-type air-core reactor.
The above power factor
The calculation formula of (2) is as follows:
wherein:
in the formula (I), the compound is shown in the specification,
the sampling interval of the phase voltage in one sampling period is the same as the sampling interval of the phase current in one sampling period, both are at,
t represents the time length of a sampling period, and N represents the number of sampling points of phase voltage and phase current in the sampling period; u (k Δ t) represents the phase voltage of the kth sampling point within one sampling period; i (k Δ t) represents the phase current at the kth sampling point within one sampling period; and omega represents the power frequency angular frequency.
Before the protection device is put into use, power factors of the dry type air reactor after different turn-to-turn short circuits are calculated according to different dry type air reactor simulations, the condition that the variation of the power factors is minimum is selected, the ratio of the power factors to the power factors before short circuits under the condition is referred, the development process of the turn-to-turn short circuits is fully considered, and the appropriate number of the periods spaced between two sampling periods and the ratio threshold of the power factors are comprehensively set. In this embodiment, the number of cycles separated between two sampling cycles is at least 50 or more, that is, two sampling cycles are separated by at least 1 second or more. The threshold value of the ratio of the power factors is not more than 1.45.
It should be noted that, although the above-mentioned embodiments of the present invention are illustrative, the present invention is not limited thereto, and therefore, the present invention is not limited to the above-mentioned embodiments. Other embodiments, which can be made by those skilled in the art in light of the teachings of the present invention, are considered to be within the scope of the present invention without departing from the principles thereof.
Claims (3)
1. A power factor-based turn-to-turn short circuit protection device of a dry type air reactor is characterized by comprising an analog signal conditioning unit, an A/D signal conversion unit, a central processing unit, a driving unit, a communication interface circuit and a human-computer interaction interface;
the input end of the analog signal conditioning unit is used as the input end of the protection device and inputs phase voltage and phase current of the dry-type air-core reactor; the output end of the analog signal conditioning unit is connected with the input end of the central processing unit through the A/D signal conversion unit, the output end of the central processing unit is connected with the input end of the driving unit, and the output end of the driving unit is used as the output end of the protection device to output switching value; the human-computer interaction interface and the communication interface circuit are connected to the central processing unit; one end of the communication interface circuit is connected with the central processing unit, and the other end of the communication interface circuit is connected with the upper computer.
2. The power factor-based dry-type air-core reactor turn-to-turn short circuit protection device as claimed in claim 1, wherein the communication interface circuit comprises an RS485 interface circuit, an RS232 interface circuit and/or a CAN interface circuit.
3. The power factor-based dry air-core reactor turn-to-turn short circuit protection device as claimed in claim 1, wherein the human-machine interface is a touch screen.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021969636.4U CN212811270U (en) | 2020-09-10 | 2020-09-10 | Dry-type air-core reactor turn-to-turn short circuit protection device based on power factor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021969636.4U CN212811270U (en) | 2020-09-10 | 2020-09-10 | Dry-type air-core reactor turn-to-turn short circuit protection device based on power factor |
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| CN212811270U true CN212811270U (en) | 2021-03-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111934286A (en) * | 2020-09-10 | 2020-11-13 | 桂林五环电器制造有限公司 | Dry-type air-core reactor turn-to-turn short circuit protection method and device based on power factor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111934286A (en) * | 2020-09-10 | 2020-11-13 | 桂林五环电器制造有限公司 | Dry-type air-core reactor turn-to-turn short circuit protection method and device based on power factor |
| CN111934286B (en) * | 2020-09-10 | 2024-07-23 | 桂林五环电器制造有限公司 | Method and device for protecting turn-to-turn short circuit of dry air reactor based on power factor |
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