CN111193247B - A full-line fast-acting two-stage current protection device and method - Google Patents
A full-line fast-acting two-stage current protection device and method Download PDFInfo
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- CN111193247B CN111193247B CN202010133053.6A CN202010133053A CN111193247B CN 111193247 B CN111193247 B CN 111193247B CN 202010133053 A CN202010133053 A CN 202010133053A CN 111193247 B CN111193247 B CN 111193247B
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
- H02H1/0015—Using arc detectors
- H02H1/0023—Using arc detectors sensing non electrical parameters, e.g. by optical, pneumatic, thermal or sonic sensors
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- 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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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Abstract
一种全线速动的两段式电流保护装置及方法，涉及电流保护技术领域。主要由多个微机型线路保护装置和若干个图像处理终端构成；图像处理终端依次设置在线路杆塔上，微机型线路保护装置设置在变电站内。本发明的全线速动的两段式电流保护装置及方法，可以明确发生故障的位置是在本段线路还是在下一段线路上，将三段式电流保护简化为两段式电流保护。其中，电流I段保护保护本段的全长，无延时动作，作为本段的主保护。而且，无线信号的传送速度非常快，对于继电保护的速动性几乎没有影响，可以在0.1s以内快速准确切除故障。电流II段保护保护范围为本段的全长，延时Δt时间动作，作为本段的后备保护。
A two-stage current protection device and method with full-line fast action, relating to the field of current protection technology. It is mainly composed of a plurality of microcomputer-type line protection devices and a plurality of image processing terminals; the image processing terminals are arranged on the line towers in sequence, and the microcomputer-type line protection device is arranged in the substation. The full-line fast-acting two-stage current protection device and method of the present invention can clearly determine whether the fault occurs in the current section or the next section, and simplify the three-stage current protection into two-stage current protection. Among them, the current section I protection protects the entire length of this section, without delay action, and serves as the main protection of this section. Moreover, the transmission speed of the wireless signal is very fast, which has almost no effect on the speed of relay protection, and can quickly and accurately cut off the fault within 0.1s. The protection range of the current section II protection is the entire length of this section, and it acts with a delay of Δt time, serving as the backup protection of this section.
Description
Technical Field
The invention relates to the technical field of current protection, in particular to a full-line quick-acting two-section type current protection device and method.
Background
In voltage networks of 35kV and below, three-stage current protection consisting of time-free current quick-break protection (current I-stage protection), time-limited current quick-break protection (current II-stage protection) and time-limited overcurrent protection (current III-stage protection) are widely used as protection schemes for phase-to-phase short circuits of power transmission lines.
The three-stage current protection is simple and reliable and can meet the requirement of rapid fault removal in general, but the three-stage current protection also has the defect of being directly influenced by the wiring mode of a power grid and the operation mode change of a power system, for example, a setting value must be selected according to the maximum operation mode of the system, and the sensitivity must be checked by the minimum operation mode of the system, so that the three-stage current protection cannot meet the requirement of sensitivity or protection range.
In the network shown in fig. 1, the phase voltage of the power supply is E G, the maximum equivalent impedance is Z smax, the minimum equivalent impedance is Z smin, and the line impedance per unit length is Z 1, then according to the conventional three-stage current protection calculation method, the current I-stage protection constant value in the networkThe calculation formula is shown as formula (1), whereinFor the reliable coefficient of the current I section protection, 1.2-1.3 is usually adopted.
As can be seen from the formula (1), the setting value of the current I section protectionIs a reliable coefficientMultiplied by the maximum short circuit current at the end of the line I kmax. If the reliability coefficient is not consideredWhen the short-circuit fault occurs at the outlet (such as n point) of the next section of line (BC section) due to the overlarge protection range of the current I section, the short-circuit fault is mistakenly considered to occur at the tail end (such as m point) of the current section of line (AB section) due to measurement error and the like, so that the breaker QF1 trips to cut the fault, and no selective misoperation is caused. But consider the reliability coefficientAnd then, the protection range of the current I section protection is reduced, and if the system operation mode changes greatly, the protection area of the current I section protection is very small or even has no protection area.
Disclosure of Invention
In order to solve the problems, the invention provides a full-line quick-acting two-section current protection device and a full-line quick-acting two-section current protection method, which can clearly determine whether a fault occurs on a current section of line or a next section of line, and realize rapid and accurate fault removal.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The two-stage current protector for full-line quick-action is set on the power transmission line and is mainly formed from several microcomputer-type circuit protectors and several image processing terminals; the image processing terminal is sequentially arranged on the circuit tower and consists of an arc light camera, a first analog-to-digital conversion module, a first microprocessor, a first wireless receiving module and a first wireless transmitting module which are electrically connected in sequence, wherein the shooting directions of all the arc light cameras are all directed at the tail end of the circuit; the microcomputer circuit protection device is arranged in a transformer substation and comprises a second wireless transmitting module, a second wireless receiving module, a low-pass filter, a second analog-to-digital conversion module, a second microprocessor, a first light isolator and a circuit breaker which are electrically connected in sequence.
The signal sent by the second microprocessor is output to the second wireless transmitting module through the second light interval, then the first wireless receiving module of the image processing terminal receives the signal, the first microprocessor controls the arc light camera to start working, the arc light signal shot by the arc light camera converts the arc light intensity into digital quantity through the first analog-to-digital conversion module, and the digital quantity is transmitted to the second wireless receiving module of the microcomputer circuit protection device through the first wireless transmitting module.
The second wireless receiving module receives the signals sent by the first wireless sending module, outputs the signals to the second microprocessor through the second light interval, compares the digital signals transmitted by the plurality of image processing terminals to find out a line arc light occurrence point, namely a fault point, and then controls a breaker of a line section where the fault point is located to trip so as to cut off the fault.
The two-stage current protection method for realizing full-line quick-action by utilizing the protection device comprises the following steps:
① . Two-section type current protection device for constructing full-line quick-action
Image processing terminals n, … and 6,5,4,3,2,1 arranged on the pole tower are respectively arranged on an AB section of the power transmission line along the conveying direction; image processing terminals 1m,1m-1, …,16, 15, 14, 13, 12, 11 which are arranged on a pole tower are respectively arranged on a BC section of the power transmission line along the conveying direction;
the 2 groups of microcomputer-type circuit protection devices are respectively arranged in transformer substations at two ends of the AB section, and the circuit breakers QF1 and QF2 are respectively arranged at the starting ends of the AB section and the BC section;
The image processing terminal is arranged on the circuit tower, all the directions of the arc cameras are directed at the tail end of the circuit, and the image processing terminal is used for collecting arc light during short circuit, converting the intensity of the arc light into digital quantity and transmitting the digital quantity to a microcomputer circuit protection device in a transformer substation; the microcomputer type line protection device collects arc intensity wireless digital signals transmitted from the image processing terminal;
② . Current I-section protection
Assuming that a short-circuit fault occurs at a K 2 point of the BC segment line, and a K 2 point is arranged between the image processing terminals 1m and 1 m-1;
When a short circuit fault occurs at the point K 2, the microcomputer type circuit protection device can judge that the short circuit fault occurs on the line AB or the line BC through the collected current, a wireless transmitting module in the microcomputer type circuit protection device sends out a wireless signal, an image processing terminal arranged on the AB line and the BC line is summoned to work, an arc light camera in the image processing terminal shoots, and the arc light camera is converted into a digital quantity and then is transmitted to the microcomputer type circuit protection device through a wireless communication module;
Because the shooting directions of all the arc cameras face the tail end of the line, the image processing terminals 1m-1, 1m-2, … and 11 between the short-circuit fault point and the tail end of the line cannot shoot the arc, the light intensity of the arc collected by the image processing terminal 1m is strongest, the light intensity of the arc collected by the image processing terminal 1 is second, the light intensity of the arc collected by the image processing terminal 2 is second, and the light intensity of the arc collected by the image processing terminal n is weakest;
After the microcomputer type line protection device receives the light intensity digital signals, the short circuit fault is determined to occur in the line part between the image processing terminal 1m and the image processing terminal 1m-1 through analysis and judgment, namely, the short circuit fault occurs in the line BC section, and the microcomputer type line protection device generates a tripping command to enable the breaker QF2 to trip and cut off the fault;
the current I section protects the whole length of the section, has no delay action and is used as the main protection of the section;
③ . Current II section protection
The protection range of the current II section is the whole length of the section, and the current II section acts with a delay delta t time to serve as the backup protection of the section.
Compared with the prior art, the invention has the beneficial effects that:
the full-line quick-acting two-section type current protection device and method can clearly determine whether the fault position is on the current section line or the next section line, and simplify the three-section type current protection into the two-section type current protection. The current I section protects the whole length of the current I section, and the current I section does not have time delay action and is used as the main protection of the current I section. In addition, the transmission speed of the wireless signal is very high, the influence on the quick action of relay protection is little, and faults can be rapidly and accurately removed within 0.1 s. The protection scope of the current II section is the whole length of the section, and the current II section acts with a delay delta t time to serve as the backup protection of the section.
Drawings
The full-line snap-action two-stage current protection device and method of the present invention are described in further detail below with reference to the examples and figures.
Fig. 1 is a transmission line network.
Fig. 2 is a schematic diagram of a full-line snap-action two-stage current protection device according to the present invention.
Fig. 3 is a schematic diagram of the structure of the image processing terminal.
Fig. 4 is a schematic structural view of the microcomputer-based line protection device.
Detailed Description
In view of the reduced protection range of the current I section protection in the prior art, if the system operation mode changes greatly, the protection area of the current I section protection is very small or even has no protection area and the like. If it is clear when a short-circuit fault occurs, whether the fault is located on the current section line or the next section line, it is completely possible to simply set the three-section current protection to the two-section current protection. The current I section protects the whole length of the current I section, has no delay action and is used as the main protection of the current I section; the protection scope of the current II section is the whole length of the section, and the current II section acts with a delay delta t time to serve as the backup protection of the section.
Therefore, the present invention proposes a full-line quick-acting two-stage current protection device to achieve the protection function, referring to fig. 2-4, and mainly comprising a plurality of microcomputer-type line protection devices and a plurality of image processing terminals. The image processing terminal is sequentially arranged on the circuit tower and is composed of an arc light camera, a first analog-to-digital conversion module, a first microprocessor, a first wireless receiving module and a first wireless transmitting module which are electrically connected in sequence, and the shooting directions of all the arc light cameras are all directed to the tail end of the circuit. The microcomputer circuit protection device is arranged in the transformer substation and comprises a second wireless transmitting module, a second wireless receiving module, a low-pass filter, a second analog-to-digital conversion module, a second microprocessor, a first light isolator and a circuit breaker which are electrically connected in sequence.
The signal sent by the second microprocessor is output to the second wireless transmitting module through the second light interval, then the first wireless receiving module of the image processing terminal receives the signal, the first microprocessor controls the arc light camera to start working, the arc light signal shot by the arc light camera converts the arc light intensity into digital quantity through the first analog-to-digital conversion module, and the digital quantity is transmitted to the second wireless receiving module of the microcomputer circuit protection device through the first wireless transmitting module.
The second wireless receiving module receives the signals sent by the first wireless sending module, outputs the signals to the second microprocessor through the second light interval, compares the digital signals transmitted by the plurality of image processing terminals to find out a line arc light occurrence point, namely a fault point, and then controls a breaker of a line section where the fault point is located to trip so as to cut off the fault.
The two-stage current protection method for full-line quick-action comprises the following steps:
① . Two-section type current protection device for constructing full-line quick-action
Image processing terminals n, … and 6,5,4,3,2,1 mounted on the towers are respectively arranged on the AB section of the power transmission line along the conveying direction. Image processing terminals 1m,1m-1, …,16, 15, 14, 13, 12, 11 mounted on the towers are respectively provided on the BC section of the power transmission line in the conveying direction.
The 2 groups of microcomputer-type circuit protection devices are respectively arranged in substations at two ends of the AB section, and the circuit breakers QF1 and QF2 are respectively arranged at the starting ends of the AB section and the BC section.
The image processing terminal (part ① in fig. 2) is installed on the tower of the circuit, and in general, the distance between two towers is between 50m and 200m, and all the directions of arc cameras of the image processing terminal are directed to the tail end of the circuit, so as to collect arc light during short circuit, convert the intensity of the arc light into digital quantity, and then transmit the digital quantity to a microcomputer circuit protection device in the transformer substation by using a 5G wireless communication means.
The main protection principle of the microcomputer type line protection device (the component ② in fig. 2) adopts the principle of the two-stage type current protection, and besides the necessary analog quantities such as voltage and current, the general switching values such as the position of a circuit breaker and the position of a disconnecting switch, the wireless digital signal of arc intensity transmitted from an image processing terminal (the component ①) needs to be acquired.
② . Current I-section protection
Assuming that the short-circuit fault occurs at the point K 2 of the BC-section line, the point K 2 is located between the image processing terminals 1m and 1m-1, according to the relay protection selectivity, the breaker QF2 should trip to cut off the fault, since K 2 is close to the end of the AB-section, if the conventional three-section current protection scheme is adopted, the fault is likely to be mistakenly considered that K 1 in the AB-section of the line occurs, and the breaker QF1 is tripped, so that the power outage range is enlarged. Whereas the full-line snap-action two-segment current protection device system of the present invention operates in the following manner:
When a short-circuit fault occurs at the point K 2, the microcomputer type circuit protection device can judge that the short-circuit fault occurs on the line AB or the line BC through the collected current, but the short-circuit fault is unknown in particular in the AB segment or the BC segment. At the moment, a wireless transmitting module in the microcomputer type circuit protection device transmits wireless signals, an image processing terminal arranged on an AB circuit and a BC circuit is summoned to work, an arc light camera in the image processing terminal shoots, and the arc light camera is converted into digital quantity and then transmitted to the microcomputer type circuit protection device through a wireless communication module.
It is obvious that since the shooting directions of all the arc cameras are toward the line end, the image processing terminals 1m-1, 1m-2, …, 11 between the short-circuit fault point and the line end cannot shoot the arc, the intensity of the arc light collected by the image processing terminal 1m is strongest, the intensity of the arc light collected by the image processing terminal 1 is next second, the intensity of the arc light collected by the image processing terminal 2 is next weakest, and the intensity of the arc light collected by the image processing terminal n is the weakest.
After the microcomputer type line protection device receives the light intensity digital signals, through analysis and judgment, it can be determined that a short circuit fault occurs in a line part between the image processing terminal 1m and the image processing terminal 1m-1, namely, a short circuit fault occurs in a line BC section, and a trip command occurs in the microcomputer type line protection device, so that the breaker QF2 trips to cut off the fault.
Therefore, the current I section protection can protect the whole length of the current I section without delay action and is used as the main protection of the current I section. Moreover, the transmission speed of the wireless signal is very high, the quick action of relay protection is hardly influenced, and the protection can be ensured to cut off faults within 0.1 s.
③ . Current II section protection
The protection range of the current II section is the whole length of the section, and the current II section acts with a delay delta t time to serve as the backup protection of the section.
The foregoing is merely illustrative and explanatory of the principles of the invention, as various modifications and additions may be made to the specific embodiments described, or similar thereto, by those skilled in the art, without departing from the principles of the invention or beyond the scope of the appended claims.
Claims (1)
1. The two-section type current protection method for realizing the full-line quick-action by utilizing the two-section type current protection device for the full-line quick-action is characterized in that:
The full-line quick-acting two-section type current protection device is arranged on a power transmission line and consists of a plurality of microcomputer type line protection devices and a plurality of image processing terminals; the image processing terminal is sequentially arranged on the circuit tower and consists of an arc light camera, a first analog-to-digital conversion module, a first microprocessor, a first wireless receiving module and a first wireless transmitting module which are electrically connected in sequence, wherein the shooting directions of all the arc light cameras are all directed at the tail end of the circuit; the microcomputer circuit protection device is arranged in the transformer substation and comprises a second wireless transmitting module, a second wireless receiving module, a low-pass filter, a second analog-to-digital conversion module, a second microprocessor, a first light isolator and a circuit breaker which are electrically connected in sequence;
the signal sent by the second microprocessor is output to the second wireless transmitting module through a second light partition, the first wireless receiving module of the image processing terminal receives the signal, the first microprocessor controls the arc light camera to start working, the arc light signal shot by the arc light camera converts the arc light intensity into digital quantity through the first analog-to-digital conversion module, and the digital quantity is transmitted to the second wireless receiving module of the microcomputer circuit protection device through the first wireless transmitting module;
The second wireless receiving module receives the signals sent by the first wireless sending module, outputs the signals to the second microprocessor through a second light interval, compares the digital signals transmitted by the plurality of image processing terminals to find out a line arc occurrence point, namely a fault point, and then controls a breaker of a line section where the fault point is located to trip so as to cut off the fault;
the two-stage current protection method comprises the following steps:
① . Two-section type current protection device for constructing full-line quick-action
Image processing terminals n, … and 6,5,4,3,2,1 arranged on the pole tower are respectively arranged on an AB section of the power transmission line along the conveying direction; image processing terminals 1m,1m-1, …,16, 15, 14, 13, 12, 11 which are arranged on a pole tower are respectively arranged on a BC section of the power transmission line along the conveying direction;
the 2 groups of microcomputer-type circuit protection devices are respectively arranged in transformer substations at two ends of the AB section, and the circuit breakers QF1 and QF2 are respectively arranged at the starting ends of the AB section and the BC section;
The image processing terminal is arranged on the circuit tower, all the directions of the arc cameras are directed at the tail end of the circuit, and the image processing terminal is used for collecting arc light during short circuit, converting the intensity of the arc light into digital quantity and transmitting the digital quantity to a microcomputer circuit protection device in a transformer substation; the microcomputer type line protection device collects arc intensity wireless digital signals transmitted from the image processing terminal;
② . Current I-section protection
Assuming that a short-circuit fault occurs at a K 2 point of the BC segment line, and a K 2 point is arranged between the image processing terminals 1m and 1 m-1;
When a short circuit fault occurs at the point K 2, the microcomputer type circuit protection device can judge that the short circuit fault occurs on the line AB or the line BC through the collected current, a wireless transmitting module in the microcomputer type circuit protection device sends out a wireless signal, an image processing terminal arranged on the AB line and the BC line is summoned to work, an arc light camera in the image processing terminal shoots, and the arc light camera is converted into a digital quantity and then is transmitted to the microcomputer type circuit protection device through a wireless communication module;
Because the shooting directions of all the arc cameras face the tail end of the line, the image processing terminals 1m-1, 1m-2, … and 11 between the short-circuit fault point and the tail end of the line cannot shoot the arc, the light intensity of the arc collected by the image processing terminal 1m is strongest, the light intensity of the arc collected by the image processing terminal 1 is second, the light intensity of the arc collected by the image processing terminal 2 is second, and the light intensity of the arc collected by the image processing terminal n is weakest;
After the microcomputer type line protection device receives the light intensity digital signals, the short circuit fault is determined to occur in the line part between the image processing terminal 1m and the image processing terminal 1m-1 through analysis and judgment, namely, the short circuit fault occurs in the line BC section, and the microcomputer type line protection device generates a tripping command to enable the breaker QF2 to trip and cut off the fault;
the current I section protects the whole length of the section, has no delay action and is used as the main protection of the section;
③ . Current II section protection
The protection range of the current II section protection is the full length of the section, and the time delay is carried outTime action is used as backup protection of the section.
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| JPS5854825A (en) * | 1981-09-29 | 1983-03-31 | 株式会社東芝 | Protective relay unit |
| US7463465B2 (en) * | 2006-12-28 | 2008-12-09 | General Electric Company | Series arc fault current interrupters and methods |
| KR101334312B1 (en) * | 2013-03-21 | 2013-11-29 | 주식회사 다인산전 | Distribution board, motor control panel and cabinet panel with function of controlling approch distance in accordance with arc flash energy |
| CN103499774B (en) * | 2013-07-09 | 2016-03-02 | 武汉双微电气科技有限公司 | Transmission of electricity insulator arc-over in-service monitoring safety early warning device |
| CN109617027B (en) * | 2018-12-11 | 2020-07-31 | 华北电力大学 | High-frequency sudden-change distance protection method for flexible direct-current power distribution system |
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| CN101515716A (en) * | 2009-04-03 | 2009-08-26 | 天津大学 | Current protection method of feeder line containing distributed power |
| CN203589715U (en) * | 2013-11-26 | 2014-05-07 | 成都比善科技开发有限公司 | Master-control-type arc light protection system |
| CN211530734U (en) * | 2020-03-01 | 2020-09-18 | 国网安徽省电力有限公司培训中心 | A full-line quick-acting two-stage current protection device |
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