CN112670950B - Self-repairing method of PT intelligent blocking device - Google Patents
Self-repairing method of PT intelligent blocking device Download PDFInfo
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- CN112670950B CN112670950B CN202011484456.1A CN202011484456A CN112670950B CN 112670950 B CN112670950 B CN 112670950B CN 202011484456 A CN202011484456 A CN 202011484456A CN 112670950 B CN112670950 B CN 112670950B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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Abstract
The invention discloses a self-repairing method of a PT intelligent blocking device, which relates to the technical field of blocking devices, and is characterized in that a micro capacitor plate circuit on a film inside a main capacitor of the PT intelligent blocking device is redesigned, so that after a certain main micro capacitor in the micro capacitor plate circuit is broken down, the main capacitance value of the micro capacitor plate circuit is kept stable; when the capacitance value of the PT intelligent blocking device cannot be kept stable after the PT intelligent blocking device breaks down, the main capacitance value of the punctured PT intelligent blocking device is adjusted through an intelligent algorithm, so that the capacitance value of the PT blocking device is always kept stable without deviation. The problem of main part capacitance value in the current PT intelligent block ware because the miniature electric capacity of internal portion takes place to damage and leads to the capacitance value to take place to drift is solved.
Description
Technical Field
The invention belongs to the technical field of blockers, and particularly relates to a self-repairing method of a PT intelligent blocking device.
Background
When a direct current trial transmission is carried out on a power transmission line, direct current high voltage can be short-circuited to the ground due to the direct current characteristic of the PT, and a direct current instrument cannot normally boost the voltage for testing, so that the PT intelligent blocking device needs to be connected between the PT and a main line in series. However, in actual operation, the main capacitance value in the PT intelligent blocking device is damaged due to the internal micro capacitor, so that the capacitance value drifts, and the output accuracy of PT is further affected. Therefore, an intelligent self-repairing method is needed to ensure the accurate capacity value.
Disclosure of Invention
The invention aims to provide a self-repairing method of a PT intelligent blocking device, so that the defect that the capacitance value of a main capacitance value in the existing PT intelligent blocking device is shifted due to the fact that a micro capacitor in the main capacitance value is damaged is overcome.
In order to achieve the above object, the present invention provides a self-repairing method for a PT intelligent blocking device, comprising:
redesigning a micro capacitor plate circuit on a film inside a main capacitor of the PT intelligent blocking device, so that after a certain main micro capacitor in the micro capacitor plate circuit is broken down, the main capacitance value of the micro capacitor plate circuit is kept stable;
when the capacitance value of the PT intelligent blocking device cannot be kept stable after the PT intelligent blocking device fails, the main capacitance value of the punctured PT intelligent blocking device is adjusted through an intelligent algorithm, so that the main capacitance value of the PT intelligent blocking device is kept stable.
Further, redesigning the micro capacitive plate circuit on the internal film of the bulk capacitor of the PT smart cut-off device includes the following steps: an equivalent backup micro capacitor is connected in parallel beside each main micro capacitor in the main capacitor of the PT intelligent blocking device, and one electrode of the backup micro capacitor is connected with a fuse, so that the backup micro capacitor is in a short-circuit state when the micro capacitor plate circuit is normally used, and the main capacitor in the micro capacitor plate circuit is broken down to turn on the backup micro capacitor.
Further, redesigning the micro-capacitor plate circuit on the internal film of the bulk capacitor comprises: the miniature electric capacity of main part, with the miniature electric capacity of reserve and the fuse fusing device of the equal equivalence of the miniature electric capacity of main part, the one end of the miniature electric capacity of main part with the one end of fuse fusing device is connected, the both ends of the miniature electric capacity of reserve respectively with the other end of the miniature electric capacity of main part and the other end of fuse fusing device are connected, just the fuse of fuse fusing device meets with the electrode of the miniature electric capacity of reserve, makes the miniature electric capacity of reserve short circuit, through the miniature electric capacity of multiunit main part, with the miniature electric capacity of a set of new main part that the miniature electric capacity of reserve and the fuse fusing device of the equal equivalence of the miniature electric capacity of main part formed, with the miniature electric capacity board circuit on the parallelly connected inside film of a plurality of new miniature electric capacities of main part.
Further, the intelligent algorithm judges through the voltage of the output end of the PT intelligent blocking device.
Further, the intelligent algorithm comprises the following steps:
and calculating the average voltage value within a period of time, and if the ratio of the average voltage value to the nominal voltage value within a period of time exceeds a certain threshold, giving a capacity value correction instruction to allow the inside of the PT intelligent blocking device to carry out capacity value correction, otherwise, not needing correction.
Furthermore, the voltage of the output end of the PT intelligent blocking device is obtained by adding a voltage detection module at the output end of the PT intelligent blocking device.
Further, the threshold value of the metering type PT is 0.2%, the threshold value of the measuring type PT is 0.5%, and the threshold value of the switch operation power supply type PT is 1.5%.
Furthermore, the correction circuit of the PT intelligent blocking device comprises a plurality of correction capacitors, each correction capacitor is connected with a circuit breaker in series, and a plurality of groups of correction capacitors connected in series are connected with the circuit breakers in parallel.
Further, the main capacitance value is adjusted to control the breaker of the correction circuit to be switched off, so that the main capacitance value of the PT intelligent blocking device is kept stable.
Compared with the prior art, the invention has the following beneficial effects:
according to the self-repairing method of the PT intelligent blocking device, the miniature capacitor plate circuit on the film inside the main capacitor of the PT intelligent blocking device is redesigned, so that the main capacitance value of the miniature capacitor plate circuit is kept stable after a certain main miniature capacitor in the miniature capacitor plate circuit is broken down; when the capacitance value of the PT intelligent blocking device cannot be kept stable after the PT intelligent blocking device breaks down, the main capacitance value of the punctured PT intelligent blocking device is adjusted through an intelligent algorithm, so that the capacitance value of the PT blocking device is always kept stable without deviation. The problem of main part capacitance value in the current PT intelligent block ware because the miniature electric capacity of internal portion takes place to damage and leads to the capacitance value to take place to drift is solved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of a fuse and a micro capacitor of a single electrode inside a micro capacitor of a conventional PT blocker main body;
FIG. 2 is a schematic diagram of a conventional PT blocker body with breakdown of the internal micro-capacitor of the micro-capacitor;
fig. 3 is a flowchart of a self-repairing method of a PT intelligent blocking apparatus according to the present invention;
FIG. 4 is a schematic diagram of a normal state single electrode for redesigning a micro capacitor plate circuit on the internal film of a bulk capacitor in accordance with one embodiment of the present invention;
FIG. 5 is a schematic diagram of a normal state circuit for redesigning a micro capacitor plate circuit on an internal film of a bulk capacitor, in accordance with one embodiment of the present invention;
FIG. 6 is a schematic diagram of a single electrode of the embodiment of FIG. 4 in a state where a bulk capacitance is broken down;
FIG. 7 is a schematic diagram of the circuit structure of the embodiment of FIG. 5 in a state where the bulk capacitor is broken down;
FIG. 8 is a circuit diagram of a full wave rectifier module in accordance with one embodiment of the present invention;
FIG. 9 is a circuit diagram of a single-chip microcomputer according to one embodiment of the present invention;
fig. 10 is an internal capacity value correction circuit of a PT smart cut-off device according to one embodiment of the present invention;
fig. 11 is a circuit diagram of an access voltage detection module of a PT smart cut-off device according to one embodiment of the present invention.
Detailed Description
The technical solutions in the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the main capacitor inside the conventional PT intelligent blocking device is formed by connecting numerous micro capacitors and fuse blowing devices in series in parallel, that is, each micro capacitor is provided with a fuse blowing device as internal short circuit protection. When a miniature capacitor breaks down, other intact capacitors discharge the miniature capacitor, so that the fuse wire is rapidly blown in millisecond time to cut off the fault element, and the PT interrupter can continue to work. However, at this time, the main capacitance value has already deviated and needs to be corrected or self-repaired, otherwise, the accuracy of PT output will be seriously affected, and further the power grid monitoring system will be disturbed.
As shown in fig. 3, the self-repairing method of the PT intelligent blocking apparatus provided by the present invention includes the following steps:
redesigning a micro capacitor plate circuit on a film inside a main capacitor of the PT intelligent blocking device, so that after a certain main micro capacitor in the micro capacitor plate circuit is broken down, the main capacitance value of the micro capacitor plate circuit is kept stable;
when the capacitance value of the PT intelligent blocking device cannot be kept stable after the PT intelligent blocking device fails, the main capacitance value of the punctured PT intelligent blocking device is adjusted through an intelligent algorithm, so that the main capacitance value of the PT intelligent blocking device is kept stable.
In one embodiment, the redesigning of the micro capacitive plate circuit on the internal film of the bulk capacitor of the PT smart cut-off device comprises the steps of: an equivalent backup micro capacitor is connected in parallel beside each main micro capacitor in the main capacitors of the PT intelligent blocking device, and one electrode of the backup micro capacitor is connected with a fuse, so that the backup micro capacitor is in a short-circuit state when the micro capacitor plate circuit is normally used, and the main capacitors in the micro capacitor plate circuit are broken down to turn on the backup micro capacitor.
Redesigning the micro capacitor plate circuit on the bulk capacitor inner film includes: the miniature electric capacity of main part, with the miniature electric capacity of reserve and the fuse fusing device of the equal equivalence of the miniature electric capacity of main part, the one end of the miniature electric capacity of main part with the one end of fuse fusing device is connected, the both ends of the miniature electric capacity of reserve respectively with the other end of the miniature electric capacity of main part and the other end of fuse fusing device are connected, just the fuse of fuse fusing device meets with the electrode of the miniature electric capacity of reserve, makes the miniature electric capacity of reserve short circuit, through the miniature electric capacity of multiunit main part, with the miniature electric capacity of a set of new main part that the miniature electric capacity of reserve and the fuse fusing device of the equal equivalence of the miniature electric capacity of main part formed, with the miniature electric capacity board circuit on the parallelly connected inside film of a plurality of new miniature electric capacities of main part.
In one embodiment, as shown in fig. 5, C1 is a main micro capacitor, C2 is a backup micro capacitor, 3 is a fuse blowing device, that is, the main micro capacitor C1 and the fuse blowing device 3 are connected in series, the backup micro capacitor C2 is connected in parallel to two ends of the main micro capacitor C1 and the fuse blowing device 3 which are connected in series, and one electrode of the backup micro capacitor C2 (the electrode on the side close to the fuse blowing device 3 with the backup micro capacitor C2) is connected to the fuse blowing device 3 through a fuse to form a new main micro capacitor, and a structural schematic diagram (shown in fig. 4) of one micro capacitor plate (electrode) of the PT smart blocking device is formed by connecting a plurality of new main micro capacitors in parallel.
As shown in fig. 4 and 5, when the main micro capacitor C1 works normally, the backup micro capacitor C2 is short-circuited by the fuse and does not work; as shown in FIGS. 6 and 7, after an abnormality occurs in one of the micro capacitor plates of the main micro capacitor C1, the PT blocker is appliedWhen a voltage V is applied, a current I = V/R passes through the micro capacitor plate, and the current density of the current flowing through the micro capacitor plate
I.e., the closer the area within the micro capacitive plate is to the fault point, the greater its current density. Power consumption due to fault point
The generated Joule heat exponentially decreases the resistance R of the semiconductor or insulating micro capacitor plate, and the current I and the power consumption W rapidly increase, so that the current density in the region of the micro capacitor plate close to the fault point
The arc is rapidly increased until the Joule heat energy melts the fuse, so that the arc flashover between the electrodes is caused, the arc is rapidly evaporated and the molten metal at the position is thrown away, an insulating isolation area without a metal layer is formed, the arc is extinguished, and the self-healing is realized. In the process, the micro capacitor plate 1 corresponding to the backup micro capacitor C2 is disconnected from the fuse, and the micro capacitor plate 2 of the backup micro capacitor C2 is synchronously turned on to work.
The miniature capacitor plate circuit on the internal film of the main capacitor can be restored by redesigning, and when one main miniature capacitor exits due to faults, the main miniature capacitor is provided with a corresponding equivalent backup capacitor top, so that the capacitance value of the PT intelligent blocking device can be always kept stable and cannot deviate within a long period of time.
In one embodiment, the intelligent algorithm is adjusted by the voltage at the output of the PT intelligent blocking device.
When the spare micro capacitor fails, the unit micro capacitor cannot maintain the value, which results in the change of the main capacitance value. Therefore, the method adjusts the main capacitance value of the punctured PT intelligent blocking device through an intelligent algorithm to keep the main capacitance value of the PT intelligent blocking device stable, and comprises the following steps:
acquiring the voltage of the output end of the PT intelligent blocking device, and feeding back the detected voltage information to the PT intelligent blocking device in real time; and an intelligent algorithm in the PT intelligent blocking device judges whether the capacity value of the blocker is adjusted or not according to the voltage information.
The intelligent algorithm comprises the following steps:
and calculating the average voltage value within a period of time, and if the ratio of the average voltage value to the nominal voltage value within a period of time exceeds a certain threshold, giving a capacity value correction instruction to allow the inside of the PT intelligent blocking device to carry out capacity value correction, otherwise, not needing correction.
In one embodiment, the voltage of the output end of the PT intelligent blocking device is obtained by adding a voltage detection module to the output end of the PT intelligent blocking device.
In one embodiment, the threshold value of the metering type PT is 0.2%, the threshold value of the measuring type PT is 0.5%, and the threshold value of the switch operation power supply type PT is 1.5%.
In one embodiment, the voltage detection module comprises a full-wave rectification module and a CPU connected with the full-wave rectification module.
As shown in fig. 8, the full-wave rectification module includes a rectifier bridge D1, an input end of the rectifier bridge D1 is connected to an output end of the PT intelligent blocking device, one end of an output end of the rectifier bridge D1 is grounded, the other end of the output end of the rectifier bridge D1, one end of a resistor R3, a diode D1, one end of a capacitor E1, a resistor R5, and one end of a resistor R6 are sequentially connected, and one end of the resistor R6 is an output end of the full-wave rectification module; the other end of the resistor R3 is grounded, the other end of the capacitor E1 is grounded, and the other end of one end of the resistor R6 is grounded.
Through the connection of the two groups of rectifier modules and the output end of the PT intelligent blocking device, direct-current voltages (AN-V1 and AN-V2) are generated after passing through the two groups of rectifier modules, and are provided for a single chip microcomputer to be sampled after being subjected to voltage division.
The singlechip is STM series singlechip, such as STM8S207S8T 6. As shown in fig. 9, the circuit diagram of the single chip microcomputer, that is, AN-V1 is connected to pin 16 of STM8S207S8T6, AN-V2 is connected to pin 17 of STM8S207S8T6, and the single chip microcomputer averages the acquired voltage at the output terminal of the PT intelligent blocking device and transmits the averaged voltage to the PT intelligent blocking device in AN RS485 manner.
In one embodiment, the correction circuit of the PT intelligent blocking device comprises a plurality of correction capacitors, each correction capacitor is connected with a circuit breaker in series, and a plurality of groups of correction capacitors connected in series are connected with the circuit breakers in parallel.
The main capacitance value of the PT intelligent blocking device is kept stable by adjusting the main capacitance value to control the breaker of the correction circuit to be switched off. The method comprises the following steps:
s1, controlling a breaker to be closed, measuring and judging the voltage accuracy of the output end of the PT intelligent blocking device, and if the voltage accuracy meets the requirement, keeping the voltage accuracy; otherwise, entering S2, controlling the next breaker to close;
s2, measuring and judging the voltage accuracy of the output end of the PT intelligent blocking device, and if the voltage accuracy meets the requirement, keeping the voltage accuracy; otherwise, repeating S1 until the PT intelligent blocker finds a new balance point to ensure the accuracy of PT output.
In one embodiment, as shown in fig. 10 and 11, the internal capacitance value correction circuit of the PT intelligent blocking device includes a plurality of sets of correction capacitors and high-voltage circuit breakers connected in series, and the internal capacitance value correction circuit of the PT intelligent blocking device is obtained by connecting the plurality of sets of correction capacitors and high-voltage circuit breakers connected in parallel. The model of the adopted high-voltage relay is HVR24-1A10-300, DC24V supplies power and can be used for a10 KV high-voltage line. The correction capacitor adopts a 0.1uF unit capacitor array, and dynamic adjustment is carried out according to the scheduling of the intelligent module on the basis of the main capacitor (generally 0.2-0.5 uF). K1 and K1 'are linked, when K1 is closed, K1' is disconnected, and vice versa; as are the other switches.
And when the intelligent repair module in the PT intelligent blocking device judges that the PT output voltage value deviates from the threshold value, starting a self-repair program. Following a progressive approach: firstly, turning off K1 (turning off K1 ')/turning off K1 (turning off K1'), enabling a new 0.1uF capacitor to be connected into a line (enabling an old 0.1uF capacitor to be withdrawn from the line), then judging the voltage accuracy of the output end of the PT intelligent blocking device, and if the voltage accuracy is OK, keeping; if not, K2 (K2 ') is adjusted continuously until Kn (Kn'). By the circulation, the PT intelligent blocker finds a new balance point to ensure the accuracy of the PT output.
The above disclosure is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or modifications within the technical scope of the present invention, and shall be covered by the scope of the present invention.
Claims (8)
1. A self-repairing method of a PT intelligent blocking device is characterized by comprising the following steps:
redesigning a micro capacitor plate circuit on a film inside a main capacitor of the PT intelligent blocking device, so that after a certain main micro capacitor in the micro capacitor plate circuit is broken down, the main capacitance value of the micro capacitor plate circuit is kept stable;
redesigning the micro capacitor plate circuit on the inner film of the bulk capacitor of the PT smart cut-off device includes the following steps: an equivalent backup micro capacitor is connected in parallel beside each main micro capacitor in main capacitors of the PT intelligent blocking device, and one electrode of the backup micro capacitor is connected with a fuse, so that the backup micro capacitor is in a short-circuit state when the micro capacitor plate circuit is normally used, and the main capacitors in the micro capacitor plate circuit are broken down to turn on the backup micro capacitor;
when the capacitance value of the PT intelligent blocking device cannot be kept stable after the PT intelligent blocking device fails, the main capacitance value of the punctured PT intelligent blocking device is adjusted through an intelligent algorithm, so that the main capacitance value of the PT intelligent blocking device is kept stable.
2. The self-healing method of a PT smart blocking device according to claim 1, wherein the redesigning of the micro capacitor plate circuit on the internal film of the bulk capacitor comprises: the miniature electric capacity of main part, with the miniature electric capacity of reserve and the fuse fusing device of the equal equivalence of the miniature electric capacity of main part, the one end of the miniature electric capacity of main part with the one end of fuse fusing device is connected, the both ends of the miniature electric capacity of reserve respectively with the other end of the miniature electric capacity of main part and the other end of fuse fusing device are connected, just the fuse of fuse fusing device meets with the electrode of the miniature electric capacity of reserve, makes the miniature electric capacity of reserve short circuit, through the miniature electric capacity of multiunit main part, with the miniature electric capacity of a set of new main part that the miniature electric capacity of reserve and the fuse fusing device of the equal equivalence of the miniature electric capacity of main part formed, with the miniature electric capacity board circuit on the parallelly connected inside film of a plurality of new miniature electric capacities of main part.
3. The self-repairing method of a PT intelligent blocking device of claim 1, wherein the intelligent algorithm judges by the voltage of the output terminal of the PT intelligent blocking device.
4. The PT smart blocking device self-healing method according to claim 3, wherein the intelligent algorithm comprises the steps of:
and calculating the average voltage value within a period of time, and if the ratio of the average voltage value to the nominal voltage value within a period of time exceeds a certain threshold, giving a capacity value correction instruction to allow the inside of the PT intelligent blocking device to carry out capacity value correction, otherwise, not needing correction.
5. The self-repairing method of a PT intelligent blocking apparatus according to claim 3, wherein the voltage of the output terminal of the PT intelligent blocking apparatus is obtained by adding a voltage detecting module to the output terminal of the PT intelligent blocking apparatus.
6. The self-repairing method of a PT intelligent blocking apparatus according to claim 1, wherein the threshold value of the metering type PT is 0.2%, the threshold value of the metering type PT is 0.5%, and the threshold value of the switching operation power type PT is 1.5%.
7. The self-repairing method of a PT intelligent blocking apparatus according to claim 1, wherein the adjustment of the capacitance of the main body of the PT intelligent blocking apparatus is performed by combining a correction circuit, the correction circuit includes a plurality of correction capacitors, each correction capacitor is connected in series with a circuit breaker, and a plurality of sets of the correction capacitors connected in series are connected in parallel with the circuit breaker.
8. The self-repairing method of a PT intelligent blocking device according to claim 7, wherein the body capacitance value is adjusted to control the breaker of the correction circuit to be turned off, so that the body capacitance value of the PT intelligent blocking device is kept stable.
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| CN103630810A (en) * | 2013-12-01 | 2014-03-12 | 国家电网公司 | Diagnosis method for insulation state of parallel compensation capacitor |
| CN104956565A (en) * | 2012-12-24 | 2015-09-30 | 麦格纳覆盖件有限公司 | Backup energy source for automotive systems and related control method |
| CN111426865A (en) * | 2020-04-03 | 2020-07-17 | 珠海市联电科技有限公司 | PT intelligent blocking device and method for power line |
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| US20060018073A1 (en) * | 2004-07-23 | 2006-01-26 | Maxwell Technologies, Inc. | Active protection against transients |
| KR101046993B1 (en) * | 2008-12-05 | 2011-07-06 | 주식회사 하이닉스반도체 | Storage capacitor array circuit |
| CN101777755B (en) * | 2010-02-02 | 2012-09-26 | 南方电网科学研究院有限责任公司 | High-voltage capacitor unbalance protection method for high-voltage direct-current transmission system |
| CN109494702A (en) * | 2019-01-04 | 2019-03-19 | 浙江正泰仪器仪表有限责任公司 | A kind of capacitance protection circuit and power protecting circuit |
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| CN104956565A (en) * | 2012-12-24 | 2015-09-30 | 麦格纳覆盖件有限公司 | Backup energy source for automotive systems and related control method |
| CN103630810A (en) * | 2013-12-01 | 2014-03-12 | 国家电网公司 | Diagnosis method for insulation state of parallel compensation capacitor |
| CN111426865A (en) * | 2020-04-03 | 2020-07-17 | 珠海市联电科技有限公司 | PT intelligent blocking device and method for power line |
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