CN212811271U - Turn-to-turn short circuit protection device for dry-type air-core reactor - Google Patents
Turn-to-turn short circuit protection device for dry-type air-core reactor Download PDFInfo
- Publication number
- CN212811271U CN212811271U CN202021971153.8U CN202021971153U CN212811271U CN 212811271 U CN212811271 U CN 212811271U CN 202021971153 U CN202021971153 U CN 202021971153U CN 212811271 U CN212811271 U CN 212811271U
- Authority
- CN
- China
- Prior art keywords
- turn
- dry
- type air
- protection device
- central processing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a turn-to-turn short circuit protection device of 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 increase and establish in current 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.
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 is that there is the not high problem of sensitivity and reliability in the use in current dry-type air-core reactor, provides a dry-type air-core reactor interturn short-circuit protection device.
In order to solve the above problems, the utility model discloses a realize through following technical scheme:
a dry-type air-core reactor turn-to-turn short circuit protection device 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 increase and establish in the electric wire netting that has used dry-type air reactor now, 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.
A 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 switching value and drive the alarm device and/or the switch actuating mechanism. 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 operation process of the turn-to-turn short circuit protection device of the dry-type air reactor 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 active current by using the obtained phase voltage and phase current, and then stores the active current and the phase voltage as a current active current reference value and a current phase voltage 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 active current by using the obtained phase voltage and phase current, and then uses the active current and the phase voltage as the current active current and the current phase voltage;
step 3, the central processing unit calculates the ratio of the current active current to the current active current reference value, and the ratio is used as the current active current ratio; meanwhile, calculating the ratio of the current phase voltage to the current phase voltage reference value, and taking the ratio as the current phase voltage ratio;
step 4, if the current active current ratio is larger than the set active current ratio threshold and the current phase voltage ratio is smaller than the set phase voltage ratio threshold, the central processing unit judges that the dry-type air-core reactor has a turn-to-turn short circuit fault and sends a corresponding alarm signal and/or a cut-off signal through the driving unit; if the ratio of the active current is smaller than the set ratio threshold of the active current and the phase voltage of the current phase changes relative to the phase voltage of the last sampling period, the central processing unit replaces the current active current with the current active current reference value and replaces the current phase voltage with the current phase voltage reference value; otherwise, the central processing unit keeps the current active current reference value and the current phase voltage reference value unchanged;
and 5, repeating the step 2 to the step 4 in the operation process of the dry-type air-core reactor.
The active current IpThe 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, the active current of the dry type air reactor after different turn-to-turn short circuits is calculated according to different dry type air reactor simulations, the condition that the change amount of the active current is minimum is selected, the ratio of the active current to the active current before the short circuit is referred to under the condition, the development process of the turn-to-turn short circuit is fully considered, and the number of the periods between two proper sampling periods, the ratio threshold value of the active current and the ratio threshold value of the phase voltage are comprehensively set. In this embodiment, the number of cycles separated between two sampling cycles is at least 50 or more, i.e., the two cycles are separated by at least 1 second or more. The ratio threshold of the active current and the ratio threshold of the phase voltage are not more than 1.5.
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 dry-type air reactor turn-to-turn short circuit protection device 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 man-machine interaction interface and the communication interface circuit are connected with the central processing unit.
2. The turn-to-turn short circuit protection device of the dry-type air-core reactor 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 turn-to-turn short circuit protection device of the dry-type air-core reactor as claimed in claim 1, wherein the human-computer interaction interface is a touch screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021971153.8U CN212811271U (en) | 2020-09-10 | 2020-09-10 | Turn-to-turn short circuit protection device for dry-type air-core reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021971153.8U CN212811271U (en) | 2020-09-10 | 2020-09-10 | Turn-to-turn short circuit protection device for dry-type air-core reactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212811271U true CN212811271U (en) | 2021-03-26 |
Family
ID=75089062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021971153.8U Active CN212811271U (en) | 2020-09-10 | 2020-09-10 | Turn-to-turn short circuit protection device for dry-type air-core reactor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212811271U (en) |
-
2020
- 2020-09-10 CN CN202021971153.8U patent/CN212811271U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103457238B (en) | A kind of direct-current arc for photovoltaic generating system detects and guard method and circuit | |
| CN110110856B (en) | Power grid fault diagnosis method and system based on multi-source information deep reasoning | |
| CN104052021B (en) | Control circuit for power circuit switches | |
| CN111313833B (en) | Method for detecting series arc fault on direct current side of series photovoltaic system | |
| CN103280776A (en) | Method for preventing incorrect operation of differential protection device | |
| CN102882187A (en) | Photovoltaic inverter protection device and method based on CPLD (complex programmable logic device) | |
| CN212811271U (en) | Turn-to-turn short circuit protection device for dry-type air-core reactor | |
| CN111381127A (en) | Method and device for single-phase earth fault and insulation monitoring of mine power supply system | |
| CN212811270U (en) | Dry-type air-core reactor turn-to-turn short circuit protection device based on power factor | |
| CN111463758B (en) | Protection method of power line | |
| CN111934285A (en) | Dry-type air-core reactor turn-to-turn short circuit protection method and device | |
| WO2023098681A1 (en) | Flexible dc power grid fault line isolation method based on pre-perturbation of dc circuit breaker, protection device and system, computer storage medium and computer program product | |
| CN111478296A (en) | Bidirectional direct current solid-state circuit breaker | |
| WO2023124140A1 (en) | High-voltage circuit breaker product line integration test method | |
| CN111934286A (en) | Dry-type air-core reactor turn-to-turn short circuit protection method and device based on power factor | |
| CN110912090A (en) | Rapid intervention method for backup protection of electric power system distance II section | |
| CN207717935U (en) | Switching signal detection circuit with self-diagnostic function | |
| CN106712307B (en) | Dynamic time delay sequential closing system and method for avoiding damage to circuit breaker by bias current | |
| CN211183401U (en) | Power line protection system | |
| CN112838564B (en) | Low-voltage line electric shock fault judgment method based on triple combined criteria and residual current circuit breaker | |
| CN201994647U (en) | Small-current grounding wire selection protection controller | |
| CN110989460B (en) | Secondary locking signal anti-error method in sequential control operation | |
| CN203838251U (en) | Integration test system for quick connection of low-voltage relay protection device | |
| CN114039412A (en) | Phase selection control method and device applied to high-voltage circuit breaker | |
| CN212844320U (en) | Online monitoring system for vibration signals of high-voltage circuit breaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |