CN113270855A - Fast isolation controller and method thereof - Google Patents
Fast isolation controller and method thereof Download PDFInfo
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- CN113270855A CN113270855A CN202110444122.XA CN202110444122A CN113270855A CN 113270855 A CN113270855 A CN 113270855A CN 202110444122 A CN202110444122 A CN 202110444122A CN 113270855 A CN113270855 A CN 113270855A
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- 238000002955 isolation Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005070 sampling Methods 0.000 claims abstract description 97
- 239000004065 semiconductor Substances 0.000 claims abstract description 17
- 230000006698 induction Effects 0.000 claims description 3
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- 239000002699 waste material Substances 0.000 description 3
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- 238000004458 analytical method Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Abstract
The invention discloses a rapid isolation controller and a method thereof, and the rapid isolation controller comprises a sampling circuit module, a processor CPU and an output circuit module, wherein the output circuit module comprises a semiconductor switch tube, the control end of the semiconductor switch tube is connected with the output control end of the processor CPU, and the output end of the semiconductor switch tube is connected with the control end of a vacuum isolation switch. The method comprises the steps that a sampling circuit module takes less than N adjacent signals in a sine wave range which is divided into N sampling points at equal time, a CPU calculates the slope degree of a current signal between every two sampling points according to the sampling signals, the slope degree is compared with the slope degrees of two sampling currents of the same sampling points at the same time of a normal current, and if the slope degrees are not consistent, the fault current is judged. The controller and the method improve the control time of the isolation controller.
Description
Technical Field
The invention relates to a 10KV medium-voltage system of a power system, in particular to a quick isolation controller and a method thereof.
Background
The power distribution network industry develops to the present, users have higher and higher requirements on power supply quality, the realization of distribution network automation is a necessary condition for improving the power supply quality, and the realization of distribution network automation also takes the intelligence of a feeder line protection device as a primary condition. A traditional intelligent distribution network is characterized in that a primary high-voltage switch, a primary high-voltage transformer PT, a secondary intelligent protection terminal controller device and cables electrically connected among the devices are arranged on a 10kV feeder line, a fault is made according to the traditional technology, at least 30 milliseconds are needed to pass, electric energy waste is caused, fault points cannot be isolated rapidly, tests show that when the line breaks down, the fault points are isolated from an actual high-voltage switch by separating, about 30 milliseconds pass, almost all the fault points are consumed in a terminal controller, and then the fault points are tested deeply, wherein software judgment uses 20 milliseconds, hardware action uses 10 milliseconds, software judgment adopts a complete period current signal which is a domestic 50HZ sine wave signal, the period is 20 milliseconds, 160 sampling points are used for one period, namely 2 points are used for one compartment time of 0.125 milliseconds, and 160 points are passed, namely 20 milliseconds, drawing a curve graph, calculating the area, when a fault occurs, the current is necessarily large, the sampling period is the same, the sampling point is the same, but the drawn curve graph is large, the calculated area is also large, and the software judges that the fault occurs. In terms of hardware, an output circuit module in the existing terminal controller adopts relay control, the action time of the relay is about 10 milliseconds inherently, the relay generates a magnetic field by electric energy, the magnetic field attracts and contacts a movable contact to complete action, and the used time is 10 milliseconds. The factors of software and hardware are added to cause that the judgment time of the whole set of equipment is slow, the quality of the transmitted electric energy is influenced, the waste of the electric energy is caused, the power supply side and the load side cannot be isolated quickly, and the hidden danger is brought to the safe operation.
Disclosure of Invention
Firstly, the invention provides a quick isolation controller for solving the hardware problem that the existing 10KV medium-voltage system cannot quickly isolate the fault point, and secondly, provides a control method of the quick isolation controller for solving the software problem that the 10KV medium-voltage system cannot quickly isolate the fault point.
The technical scheme of the invention is as follows:
a quick isolation controller is used for a 10KV medium-voltage system, the 10KV medium-voltage system comprises a 10KV power supply side, a 10KV load side, a transformer, a primary high-voltage switch and a terminal controller, wherein the primary high-voltage switch comprises a Current Transformer (CT) and a vacuum isolation switch, the output end of the 10KV power supply side is connected with the input end of the vacuum isolation switch, the transformer is installed on the outgoing line side of the 10KV power supply side and used for changing 10KV high voltage into low voltage to supply power for the terminal controller, the output end of the vacuum isolation switch is connected with the input end of the 10KV load side, the current induction end of the Current Transformer (CT) induces current on a line before the vacuum isolation switch, the output end of the Current Transformer (CT) is connected with the input end of the terminal controller, the output end of the terminal controller is connected with the control end of the vacuum isolation switch, the terminal controller comprises a sampling circuit module, a processor CPU and an output circuit module, and is characterized in that: the output circuit module comprises a semiconductor switch tube, the control end of the semiconductor switch tube is connected with the output control end of the CPU, and the output end of the semiconductor switch tube is connected with the control end of the vacuum isolating switch.
Further, the semiconductor switch tube adopts an MOS tube.
Furthermore, the method comprises the steps that the sampling circuit module adopts less than N adjacent sampling signals input to the sampling circuit module from the current transformer in a sine wave range which is divided into N sampling points at equal time, the CPU calculates the slope degree of the current signal between every two sampling points according to the sampling signals, compares the slope degree with the slope degrees of two sampling currents of the same sampling point at the same time of the normal current, and judges that the current is the fault current if the slope degrees are not consistent with the slope degrees of the two sampling currents of the same sampling point at the same time of the normal current.
Further, the processor CPU calculates the slope degree of the current signal between every two sampling points according to the sampling signals, and compares the slope degree with the slope degrees of two sampling currents of the same sampling point at the same time of the normal current to calculate the current between every two adjacent sampling points.
Further, the sampling signals input from the current transformer to the sampling circuit module taken as less than N adjacent samples are current signals between consecutive sampling points.
Further, 16 adjacent sampling signals input from the current transformer to the sampling circuit module are taken.
Further, the time interval between every two adjacent sampling points is 0.125 s.
Further, the time interval of 16 adjacent sampling signals input from the current transformer to the sampling circuit module is 0.125 s.
Further, the larger the slope degree of the current between the two sampling points is, the larger the current is, and compared with the slope degrees of the normal currents of the two sampling points, the larger the included angle is, the larger the error degree is.
The invention has the beneficial effects that: the control method of the rapid isolation controller of the invention changes the traditional fault judgment by drawing a graph by sampling points and calculating the area of the graph, directly calculates the slope degree of a plurality of sampling points, greatly shortens the calculation time, combines software and hardware, and improves the control time of the isolation controller.
Drawings
FIG. 1 is a block diagram of the hardware architecture of an embodiment of the present invention;
fig. 2 is a schematic diagram of sampling points of normal current and fault current of the method of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the features of the following embodiments and examples may be combined with each other without conflict.
As shown in fig. 1, a fast isolation controller is used for a 10KV medium voltage system, the 10KV medium voltage system includes a 10KV power supply side, a 10KV load side, a transformer 1, a primary high voltage switch 2 and a terminal controller 3, wherein the 10KV power supply side and the 10KV load side are transmission power grid 10KV wires and operate on outdoor overhead telegraph poles, the primary high voltage switch 2 includes a current transformer CT21 and a vacuum isolation switch 22, the transformer 1 is installed on the outgoing line side of the 10KV power supply side, the transformer 1 is used for changing the 10KV high voltage into a low voltage to supply power to the terminal controller 3, the output end of the vacuum isolation switch 22 is connected with the input end of the 10KV load side, the current induction end of the current transformer CT21 induces the current on the line before the vacuum isolation switch 22, the output end of the current transformer 21 is connected with the input end of the terminal controller 3, the output end of the terminal controller 3 is connected with the control end of the vacuum isolating switch 22, the terminal controller 3 is generally hung on a column of an outdoor overhead telegraph pole, the terminal controller 3 comprises a sampling circuit module 31, a processor CPU32 and an output circuit module 33, a current transformer CT21 is used for converting a large current of 10KV into a small current signal which can be collected by the sampling circuit module 31 in the terminal controller 3, and the general transformation ratio is 600: 5, the sampling circuit module 31 samples the current signal transmitted from the current transformer CT21, performs a/D conversion, converts the current signal into a digital signal desired by the processor CPU32, and when the processor CPU32 performs an operation and analysis, if a fault is determined, the signal is transmitted to the output circuit module 33, which controls the opening of the vacuum isolating switch 22 to quickly isolate the fault. In addition, the current transformer CT21 and the vacuum interrupter 22 of the present embodiment are provided inside the primary high-voltage switch 2, and the sampling circuit, the processor CPU32, and the output circuit module 33 are provided inside the terminal controller 3. The current transformer is connected with the terminal controller 3 and the terminal controller 3 is connected with the vacuum isolating switch 22 through cables. The output circuit module 33 comprises a semiconductor switch tube, the control end of the semiconductor switch tube is connected with the output control end of the processor CPU32, the output end of the semiconductor switch tube is connected with the control end of the vacuum isolating switch 22, the action time of the semiconductor is in nanosecond level, the time is hardly consumed, and the action time can be ignored. The semiconductor switch tube of the embodiment adopts the MOS tube, so that the semiconductor switch tube is not only good in use, but also low in cost. The action time of the relay is about 10 milliseconds inherently, so that the time cost is greatly saved.
A control method of a fast isolation controller comprises that a sampling circuit module 31 takes less than 160 adjacent sampling signals input to the sampling circuit module 31 from a current transformer in a sine wave range which is equally divided into 160 sampling points, a processor CPU32 calculates the slope degree of a current signal between every two sampling points according to the sampling signals, compares the slope degree with the slope degrees of two sampling currents of the same sampling point at the same time of a normal current, and judges that the current is a fault current if the slope degrees are not consistent with the slope degrees of the two sampling currents.
The processor CPU32 calculates the slope of the current signal between every two sampling points according to the sampling signal, and compares the slope with the slopes of two sampling currents at the same time and the same sampling point of the normal current to calculate the current between every two adjacent sampling points.
The sampling signals which are input to the sampling circuit module 31 from the current transformer and are less than 160 adjacent sampling signals are current signals between consecutive sampling points, the greater the gradient of the current between two sampling points is, the greater the current is, the greater the gradient is compared with the normal current of the two sampling points, and the greater the included angle is, the greater the error degree is.
In this embodiment, 16 adjacent sampling signals input from the current transformer to the sampling circuit module 31 are adopted, the time interval between every two adjacent sampling points is still 0.125s, 16 sampling points are adopted to perform a slope degree of curve change, 2 milliseconds is required, and then the data are transmitted to the processor CPU32 to be analyzed, so as to determine whether the sampling signals are fault currents. Of course, the present embodiment is not limited to collecting 16 adjacent sampling points, and collecting adjacent points can shorten the sampling time, and in addition, the number of collected points can be less than 16 without affecting the collection accuracy.
As shown in fig. 2, a normal current curve and a fault current curve are shown, wherein a line 4 represents the normal current curve and a line 5 represents the fault current curve, and the slope transition or curvature difference of the two lines can also be visually seen in the figure.
By the design of the software method, the time of 30 milliseconds calculated by the previous software can be shortened to 2 milliseconds, the time of fault current generation is reduced, the quality of transmitted electric energy can be improved, and the waste of the electric energy is reduced.
In conclusion, through the improvement of hardware and software, the fault judgment speed of the music player is improved, the power failure time caused by the fault of the transmission power grid is shortened, the judgment time caused by the fault of the transmission power grid is shortened, the rapid isolation of the power supply side and the load side is realized, and the important effect on the safe operation is achieved.
The above embodiments are merely representative of the centralized embodiments of the present invention, and the description thereof is specific and detailed, but it should not be understood as the limitation of the scope of the present invention, and it should be noted that those skilled in the art can make various changes and modifications without departing from the spirit of the present invention, and these changes and modifications all fall into the protection scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (9)
1. A quick isolation controller is used for a 10KV medium-voltage system, the 10KV medium-voltage system comprises a 10KV power supply side, a 10KV load side, a transformer, a primary high-voltage switch and a terminal controller, wherein the primary high-voltage switch comprises a Current Transformer (CT) and a vacuum isolation switch, the output end of the 10KV power supply side is connected with the input end of the vacuum isolation switch, the transformer is installed on the outgoing line side of the 10KV power supply side and used for changing 10KV high voltage into low voltage to supply power for the terminal controller, the output end of the vacuum isolation switch is connected with the input end of the 10KV load side, the current induction end of the Current Transformer (CT) induces current on a line before the vacuum isolation switch, the output end of the Current Transformer (CT) is connected with the input end of the terminal controller, the output end of the terminal controller is connected with the control end of the vacuum isolation switch, the terminal controller comprises a sampling circuit module, a processor CPU and an output circuit module, and is characterized in that: the output circuit module comprises a semiconductor switch tube, the control end of the semiconductor switch tube is connected with the output control end of the CPU, and the output end of the semiconductor switch tube is connected with the control end of the vacuum isolating switch.
2. The fast isolation controller of claim 1, wherein: the semiconductor switch tube adopts an MOS tube.
3. The control method of a fast isolating controller according to any one of claims 1 or 2, characterized by: the method comprises the steps that a sampling circuit module takes less than N adjacent sampling signals input to the sampling circuit module from a current transformer within a sine wave range divided into N sampling points by equal time, a processor CPU calculates the slope degree of the current signal between every two sampling points according to the sampling signals, compares the slope degree with the slope degrees of two sampling currents of the same sampling point at the same time of a normal current, and judges that the current is a fault current if the slope degrees are not consistent with the slope degrees of the two sampling currents of the same sampling point at the same time of the normal current.
4. The control method of a fast isolation controller according to claim 3, wherein: and the CPU calculates the slope degree of the current signal between every two sampling points according to the sampling signals, and compares the slope degree with the slope degrees of two sampling currents of the same sampling point at the same time of the normal current to calculate the current between every two adjacent sampling points.
5. The control method of a fast isolation controller according to claim 3, wherein: the sampling signals of less than N adjacent sampling signals input to the sampling circuit module from the current transformer are current signals between consecutive sampling points.
6. The control method of a fast isolation controller according to claim 5, wherein: the 16 adjacent sampling signals input to the sampling circuit module from the current transformer are taken.
7. The control method of a fast isolation controller according to claim 3, wherein: the time interval between every two adjacent sampling points is 0.125 s.
8. The control method of a fast isolation controller according to claim 6, wherein: the time interval of 16 adjacent sampling signals input to the sampling circuit module from the current transformer is 0.125 s.
9. The control method of a fast isolation controller according to claim 3, wherein: the larger the slope degree of the current between the two sampling points is, the larger the current is, and the larger the included angle is, the larger the error degree is compared with the slope degrees of the normal currents of the two sampling points.
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| CN202110444122.XA CN113270855A (en) | 2021-04-23 | 2021-04-23 | Fast isolation controller and method thereof |
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| CN202110444122.XA CN113270855A (en) | 2021-04-23 | 2021-04-23 | Fast isolation controller and method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201078829Y (en) * | 2007-04-30 | 2008-06-25 | 北京城泰电力自动化设备有限责任公司 | Fault detection controlling apparatus on column |
| CN202797918U (en) * | 2012-09-10 | 2013-03-13 | 北京恒源利通电力技术有限公司 | User demarcation load switch |
| CN103021729A (en) * | 2012-11-28 | 2013-04-03 | 扬州新概念电气有限公司 | Intelligent integrated controller for permanent magnet vacuum circuit breaker |
| US20190212713A1 (en) * | 2018-01-05 | 2019-07-11 | Emera Technologies LLC | Power grid system |
| US20200191855A1 (en) * | 2018-12-18 | 2020-06-18 | S&C Electric Company | Triggered vacuum gap fault detection methods and devices |
-
2021
- 2021-04-23 CN CN202110444122.XA patent/CN113270855A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201078829Y (en) * | 2007-04-30 | 2008-06-25 | 北京城泰电力自动化设备有限责任公司 | Fault detection controlling apparatus on column |
| CN202797918U (en) * | 2012-09-10 | 2013-03-13 | 北京恒源利通电力技术有限公司 | User demarcation load switch |
| CN103021729A (en) * | 2012-11-28 | 2013-04-03 | 扬州新概念电气有限公司 | Intelligent integrated controller for permanent magnet vacuum circuit breaker |
| US20190212713A1 (en) * | 2018-01-05 | 2019-07-11 | Emera Technologies LLC | Power grid system |
| US20200191855A1 (en) * | 2018-12-18 | 2020-06-18 | S&C Electric Company | Triggered vacuum gap fault detection methods and devices |
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