CN114865607B - Zero-loss depth current limiting method and current limiting system - Google Patents
Zero-loss depth current limiting method and current limiting system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B19/00—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow
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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
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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
- H02H7/008—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 for protective arrangements according to this subclass
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/021—Current limitation using saturable reactors
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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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The invention discloses a zero-loss deep current limiting method and a zero-loss deep current limiting system, which comprise a ZXB current limiting device, an equipment monitoring unit, a monitoring analysis unit, an abnormality processing unit, an overhaul acquisition unit, an overhaul evaluation unit, an environment monitoring unit, an environment evaluation unit, an equipment image acquisition unit and an equipment image analysis unit; the ZXB current limiting device comprises an inverter, a current limiting reactor and a control device; when the system operates normally, the rapid converter is in a closing state, the current limiting reactor is short-circuited, the active and reactive losses of the reactor are zero, the ZXB current limiting device is in a low-impedance zero-loss state, and the control device does not operate; when a short circuit occurs to a line or other equipment, the ZXB current limiting device controls the quick converter to break, and the quick converter is put into the deep current limiting reactor. The invention can realize quick control and disconnection, has better safety and more functions, and meets the actual use requirements.
Description
Technical Field
The invention relates to the field of power control, in particular to a zero-loss deep current limiting method and a zero-loss deep current limiting system.
Background
When the power transmission and transformation system has short circuit fault, the short circuit current is generally tens times of rated current, sometimes tens times, and even hundreds times of short circuit impact current. The huge short-circuit current impact causes huge damage to electric equipment such as a generator, a transformer, a circuit breaker, a power transmission line and the like, and the turn-off time of the circuit breaker is more than tens of milliseconds at present, and the turn-off capacity is less than 40KA, so that the high requirements on the thermal stability and the dynamic stability of the electric equipment are caused. Along with the continuous rising of the power consumption load of various enterprises, the capacity of the main transformer is correspondingly increased, and the power grid systems of the enterprises face the problems that the short-circuit current is close to and reaches the maximum use limit of the load vacuum circuit breaker, the breaking capacity of the load vacuum circuit breaker is insufficient, the design of the transformer for resisting the short-circuit current impact is insufficient, and the like, so that the power consumption safety operation of the enterprises is seriously threatened.
The problem of exceeding the standard of short-circuit current is more and more serious, and a plurality of enterprises limit the short-circuit current of the system by adopting a high-impedance transformer, but the problem of current limiting depth is not finally solved by increasing the impedance of the transformer, the reduction of electric power is very small, and the problems of active and reactive power loss, rising investment cost and the like are also brought;
therefore, a depth current limiting system and a method capable of limiting short-circuit current rapidly and reliably are developed, which are very important for safe and reliable operation of a power system and also for reducing equipment cost of an electric equipment manufacturer.
The existing current limiting system and method have the defects that the breaking time is too long, the protection effect is low, the use requirement which is gradually increased cannot be met, and the use of the current limiting system and method brings a certain influence, so that the zero-loss deep current limiting method and the current limiting system are provided.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: how to solve the problems that the current limiting system and method have overlong breaking time and low protection effect, cannot meet the increasing use requirement, and the current limiting system and method have certain influence due to the use, and provide a zero-loss depth current limiting method and a current limiting system.
The invention solves the technical problems through the following technical scheme that the invention comprises a ZXB current limiting device, an equipment monitoring unit, a monitoring analysis unit, an abnormality processing unit, an overhaul acquisition unit, an overhaul evaluation unit, an environment monitoring unit, an environment evaluation unit, an equipment image acquisition unit and an equipment image analysis unit;
The ZXB current limiting device comprises an inverter, a current limiting reactor and a control device;
when the system operates normally, the rapid converter is in a closing state, the current limiting reactor is short-circuited, the active and reactive losses of the reactor are zero, the ZXB current limiting device is in a low-impedance zero-loss state, and the control device does not operate;
When a circuit or other equipment is short-circuited, the ZXB current limiting device controls the quick current converter to break, the deep current limiting reactor is put into, short-circuit current is transferred to the deep current limiter, after the short-circuit fault is removed, the control device detects that the three-phase working current is recovered below a set action value, a closing command is immediately sent to the quick current converter of the three-phase current limiting unit, the deep current limiter is withdrawn, and the device is recovered to a zero-loss running state;
the equipment monitoring unit is used for monitoring system current through the current transformer, and acquiring short-circuit fault current information and short-circuit fault current occurrence time information when the short-circuit fault current is larger than a set amplitude value;
the monitoring and analyzing unit is used for processing the short-circuit fault current information and the short-circuit fault current occurrence time length information to generate fault occurrence information or short-time fault information;
The abnormality processing unit is used for sending fault sending record information and contact fault control information to the system when fault occurrence information or short-time fault information is generated;
the overhaul acquisition unit is used for acquiring overhaul information of equipment, wherein the overhaul information comprises overhaul frequency information and overhaul condition information, and the overhaul condition information comprises no faults, general faults and major faults;
the overhaul evaluation unit is used for processing overhaul frequency information and overhaul condition information to generate overhaul evaluation information and equipment replacement information;
The equipment image acquisition unit is used for acquiring image information of each equipment in the zero-loss depth current limiting system, and the equipment image analysis unit is used for analyzing the image information of each equipment to obtain equipment cleaning information and equipment overhaul warning information;
The environment monitoring unit is used for collecting the environment information of each device in the zero-loss deep current limiting system, wherein the environment information comprises temperature information, humidity information, pollution level and altitude, and the environment evaluating unit is used for processing the environment information to generate environment warning information, high-low temperature warning information and water inlet short circuit warning information.
The current limiting reactor is characterized in that an aluminum foil type dry hollow current limiting reactor is used, a winding is made of aluminum foil, the current limiting reactor is made of weather-resistant insulating materials, an ultraviolet-resistant protective layer is coated on the surface of the current limiting reactor, an anti-corrosion layer is coated on an exposed metal part of the current limiting reactor, and the anti-corrosion layer accords with the painting standard of an anti-corrosion electrical product.
Further, the specific functions of the ZXB current limiting device include:
Automatic exit: the current limiting device is put into a control power supply, the fast converter is automatically switched on after the energy storage capacitor is fully charged, the working current only flows through the fast converter with impedance close to zero, and the current limiting device works in a lossless state;
Fast current limiting: detecting working current in real time when the rapid identifier normally operates, judging once short circuit occurs, and switching off the rapid converter and putting into the deep current limiter;
Automatic recovery: after the short circuit fault is removed, the control device detects that the three-phase working current is recovered to a normal value, and immediately sends a closing command to the rapid converter of the three-phase current limiting unit, the deep current limiter is withdrawn, and the device is recovered to a lossless running state;
And (3) self-healing of faults: when any phase of the rapid converter is switched off by mistake, the rapid identifier and the control device immediately control the rapid converter to be switched on;
Remote measurement and control: the control device exchanges data with the upper monitoring system through a data interface;
event memory: the control device monitors the system current at any time, and when a short circuit accident occurs, the measurement and control unit reacts quickly and records various parameters during the short circuit.
The specific process of generating fault occurrence information or short-time fault information by processing the short-circuit fault current information and the short-circuit fault current occurrence time information of the monitoring and analyzing unit is as follows: the method comprises the steps of extracting short-circuit fault current information and short-circuit fault current occurrence time length information which are acquired, extracting short-circuit fault current occurrence time length information when the short-circuit fault current information occurs, marking the short-circuit fault current occurrence time length information as Q, generating fault occurrence information when the short-circuit fault current occurrence time length information Q is larger than a preset time length A, and generating short-time fault information when the short-circuit fault current occurrence time length information Q is smaller than A/3.
Further, the specific process of the overhaul evaluation unit for processing the overhaul frequency information and the overhaul condition information to generate overhaul evaluation information and equipment replacement information is as follows:
step one: extracting the acquired overhaul frequency information and overhaul condition information, and marking the overhaul frequency information as P;
Step two, a step two is carried out; when the overhaul frequency information P is larger than an overhaul warning value, and the overhaul time difference between the overhaul time point with the nearest time and the overhaul time point with the farthest time is larger than a preset value, directly generating equipment replacement information;
step three: when the overhaul time difference of the overhaul frequency information P is smaller than a preset value when the overhaul warning value is obtained, overhaul condition information of the overhaul frequency information P is extracted;
step four: when the number of major faults in the overhaul condition information of the overhaul frequency information P is more than or equal to 2, generating equipment replacement information;
step five: when the major faults in the overhaul condition information of the overhaul frequency information P are smaller than 2, but the occurrence frequency of the general faults is larger than a preset value, generating equipment replacement information;
Step six: and when the major faults in the overhaul condition information of the overhaul frequency information P are smaller than 2, but the occurrence frequency of the general faults is smaller than a preset value, overhaul evaluation information is generated.
The environment evaluating unit processes the environment information to generate environment warning information, high-low temperature warning information and water inlet short circuit warning information, and the specific process is as follows:
s1: providing the collected environmental information, and acquiring temperature information, humidity information, pollution level and altitude from the environmental information;
s2: the temperature information is marked as W, the temperature information is continuously collected for m times within a preset time period, m is a preset value, and the size of the temperature information is changed according to the requirement;
s3: calculating the average value of m times of temperature information W to obtain a temperature average value W Are all , recording the times d1 of m times of temperature information W larger than a high temperature threshold value and the times d2 of m times of temperature information W smaller than a low temperature threshold value, generating high and low temperature warning information when the temperature average value W Are all is larger than a preset value, and generating high and low temperature warning information when d1 or d2 is larger than the preset times;
S4: extracting humidity information, marking the humidity information as T, continuously collecting m times of humidity information T, and generating water inlet short circuit warning information when the times of which the humidity is greater than a humidity threshold value in the m times of humidity information T exceeds preset times;
S5: and extracting the pollution grade and the altitude, and generating environment warning information when the pollution grade is greater than a preset grade or the altitude is higher than the preset altitude.
The specific process of analyzing the image information of each device by the device image analysis unit to obtain the device cleaning information and the device overhaul warning information is as follows:
SS1: extracting the image information of each device, and extracting the high-definition picture information of each side of each device from the image information of each device;
SS2: marking the high-definition picture information of each side of each device as a real-time picture G Real world and comparing with a preset standard picture model G Pre-preparation ;
SS3: firstly, carrying out surface color analysis and comparison treatment, and generating equipment cleaning information when color abnormality is found;
SS4: and comparing the appearance of the real-time picture G Real world with that of a preset standard picture model G Pre-preparation , and generating equipment overhaul warning information when the obtained comparison result is abnormal in appearance.
Further, the specific process of the surface color analysis and comparison treatment is as follows: extracting a preset standard picture model G Pre-preparation , carrying out color extraction on the preset standard picture model G Pre-preparation to obtain color information in x preset standard picture models G Pre-preparation , carrying out color extraction on a real-time picture G Real world to obtain color information of a real-time picture G Real world , extracting area information of a color part when the color information of the real-time picture G Real world and the color information in x preset standard picture models G Pre-preparation are different in color, and identifying color abnormality when the area information of the color part is larger than a preset value.
Further, the specific process of obtaining the abnormal appearance by comparing the real-time picture G Real world with the preset standard picture model G Pre-preparation is as follows: providing a real-time picture G Real world , providing a preset standard picture model G Pre-preparation from a device surface area Z Real world in the real-time picture G Real world , calculating a difference value Z Pre-preparation between the device surface area Z Real world and the device surface area Z Pre-preparation from the device surface area Z Pre-preparation in the preset standard picture model G Pre-preparation , generating an appearance abnormality when the absolute value of the difference value Z Pre-preparation is larger than a preset value, performing line scanning on the real-time picture G Real world , and generating the appearance abnormality when lines which do not appear in the preset standard picture model G Pre-preparation are scanned in the real-time picture G Real world .
A zero-loss deep current limiting method, the method comprising the steps of:
Step one: the ZXB current limiting device is arranged on a circuit or equipment to be monitored, the rapid converter is in a closing state during normal operation, the current limiting reactor is short-circuited, the active and reactive losses of the reactor are zero, the ZXB current limiting device is in a low-impedance zero-loss state, and the control device does not operate;
step two: when a short circuit occurs, the ZXB current limiting device controls the quick current converter to break, the deep current limiting reactor is put into, short circuit current is transferred to the deep current limiter, after the short circuit fault is removed, the control device detects that the three-phase working current is recovered below a set action value, a closing command is immediately sent to the quick current converter of the three-phase current limiting unit, the deep current limiter is withdrawn, and the device is recovered to a zero-loss running state;
Step three: in order to prevent short-time short circuit from influencing the use of equipment in the running process of the ZXB current limiting device, a system current is monitored through a current transformer by an equipment monitoring unit, when the short-circuit fault current is larger than a set amplitude, short-circuit fault current information and short-circuit fault current occurrence time information are obtained, then the short-circuit fault current information and the short-circuit fault current occurrence time information are processed by a monitoring analysis unit to generate fault occurrence information or short-time fault information, and then an abnormal processing unit sends fault sending record information and contact fault control information to the system in the fault occurrence information or the short-time fault information.
Step four: in the running process of the ZXB current limiting device, in order to prevent the equipment from detecting abnormal damage, the overhaul collection unit collects overhaul frequency information and overhaul condition information of the equipment, and the overhaul evaluation unit processes the overhaul frequency information and the overhaul condition information to generate overhaul evaluation information and equipment replacement information;
Step five: in the running process of the ZXB current limiting device, in order to prevent the external rust or damage of the equipment, the image information of each equipment in the zero-loss depth current limiting system is acquired by an equipment image acquisition unit, and then the image information of each equipment is analyzed by an image analysis unit to obtain equipment cleaning information and equipment overhaul warning information;
Step six: in the running process of the ZXB current limiting device, in order to discover the influence of environmental conditions on the use of the device in time, an environment evaluating unit is used for collecting the environmental information of each device in the zero-loss deep current limiting system, and the environment evaluating unit processes the environmental information to generate environment warning information, high-low temperature warning information and water inlet short circuit warning information.
Compared with the prior art, the invention has the following advantages:
1. When the zero-loss deep current limiting method and the zero-loss deep current limiting system are used, a current transformer monitors the current of the system, when the short-circuit fault current is larger than a set amplitude, the accurate time of the three-phase current is rapidly and accurately predicted, signals are respectively sent out before zero crossing of each phase of current, when the current approaches zero crossing, the three phases are respectively and accurately separated and disconnected by a quick breaker, the short-circuit current enters a deep fault current limiter through current conversion device replacement flow to limit the short-circuit current, so that the impact of the short-circuit current on the system is reduced, the short-circuit current is limited to an allowable range, the short-circuit impact suffered by the system is greatly reduced, important electrical equipment such as a transformer, a generator and the like in the system is protected, the service life of the short-circuit point load vacuum breaker is prolonged, the safe operation of the system is ensured, and the system is more worth popularizing and using;
2. meanwhile, in the use process, the invention can automatically detect and evaluate the equipment installation environment, and timely send out warning information to remind maintenance personnel when the environment is abnormal, thereby reducing accidents caused by shortened service life of a current limiting device and the like due to the environment, knowing whether the shell of each equipment is corroded or damaged through image acquisition and analysis, and timely sending out warning information when the shell of each equipment is corroded or damaged, so as to avoid the accidents caused by the influence of the corrosion or damage on the equipment use caused by the shell of the equipment, and ensure higher safety of the whole system.
Drawings
Fig. 1 is a system block diagram of the present invention.
Detailed Description
The following describes in detail the examples of the present invention, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of protection of the present invention is not limited to the following examples.
As shown in fig. 1, this embodiment provides a technical solution: a zero loss deep current limiting system comprising:
the ZXB current limiting device comprises an inverter, a current limiting reactor and a control device;
The ZXB current limiting device has high action speed: the device can cut off the short-circuit current within 20ms after the system is short-circuited;
The ZXB current limiting device has strong breaking capacity: the quick breaker in the device utilizes reasonable control of the breaking initial time of the contact to minimize the arcing time, greatly increases the breaking allowance of the arc extinguishing chamber, and has the highest short-circuit breaking capacity of 80KA;
The ZXB current limiting device has good fault current limiter effect: when the device operates normally, the reactor is short-circuited, and huge electric energy loss of the reactor and voltage drop during starting of the large motor are avoided. The device is rapidly opened during short circuit, and the opening current of the load side breaker is limited to an allowable range by the reactor. When the new power supply system is designed, the impedance of the reactor can be increased, so that the opening current of the load side breaker is further reduced, and the manufacturing cost is reduced.
The ZXB current limiting device has high reliability: the converter device is internally provided with a double-loop power supply control device, and when one power supply fails indefinitely, the standby power supply control device continues to supply power to be used as a backup protection;
The ZXB current limiting device is controlled by using a ZXB control system, and comprises a ZXB control system relay controller and three split-phase controllers, wherein the relay controller is arranged in a field operation cabinet, and the split-phase controllers are respectively arranged in each phase conversion device. The split-phase controller independently controls each phase of converter unit, the relay controller is communicated with each phase-phase controller through optical fibers, displays state information of each phase of converter device, can maintain a fixed value, and can also provide data connection;
The device is arranged at the outlet of the generator or the high-voltage side short circuit of the factory and can be quickly and effectively protected, the device has large breaking capacity and limits the short circuit current depth, and is ideal protection equipment for the outlet of the generator and the branches of the factory, so that the generator and the transformer are quickly and effectively protected.
The device can replace high-impedance transformers, common series fault current limiters and explosion type high-capacity high-speed breaking devices, can be used for increasing the system impedance by using the deep fault current limiters of the device in the design of new power supply systems and the transformation of enterprise systems, further reduces the breaking current of a breaker at the load side, and can improve the power supply quality for important loads which do not allow forced self-starting of instant intermittent power supply. When a line is short-circuited, the device is quickly put into a reactor, and residual voltage on the deep fault current limiter can completely meet the requirement of maintaining continuous operation of important loads without being influenced;
when the system operates normally, the rapid converter is in a closing state, the current limiting reactor is short-circuited, the active and reactive losses of the reactor are zero, the ZXB current limiting device is in a low-impedance zero-loss state, and the control device does not operate;
When a circuit or other equipment is short-circuited, the ZXB current limiting device controls the quick current converter to break, the deep current limiting reactor is put into, short-circuit current is transferred to the deep current limiter, after the short-circuit fault is removed, the control device detects that the three-phase working current is recovered below a set action value, a closing command is immediately sent to the quick current converter of the three-phase current limiting unit, the deep current limiter is withdrawn, and the device is recovered to a zero-loss running state;
The device monitoring unit is used for monitoring system current through the current transformer, and acquiring short-circuit fault current information and short-circuit fault current occurrence time information when the short-circuit fault current is larger than a set amplitude value; the monitoring and analyzing unit is used for processing the short-circuit fault current information and the short-circuit fault current occurrence time information to generate fault occurrence information or short-time fault information; the system comprises an abnormality processing unit, a monitoring analysis unit and a short-circuit fault current occurrence time information processing unit, wherein the abnormality processing unit is used for sending fault sending record information and contact fault control information to a system when fault occurrence information or short-time fault information is generated, and the specific process of processing the short-circuit fault current information and the short-circuit fault current occurrence time information to generate the fault occurrence information or the short-time fault information is as follows: the method comprises the steps of extracting short-circuit fault current information and short-circuit fault current occurrence time length information which are acquired, extracting short-circuit fault current occurrence time length information when the short-circuit fault current information occurs, marking the short-circuit fault current occurrence time length information as Q, generating fault occurrence information when the short-circuit fault current occurrence time length information Q is larger than a preset time length A, and generating short-time fault information when the short-circuit fault current occurrence time length information Q is smaller than A/3.
Through the process, the open-circuit information can be analyzed timely, short-time open-circuit is an instant short circuit, namely, the short circuit is recovered to be normal after the short circuit occurs, the influence on a line or other equipment is small, other processing can be omitted, the situation of false failure information is avoided through integral analysis, and the normal operation of the line and other equipment is ensured.
The overhaul acquisition unit is used for acquiring overhaul information of equipment, wherein the overhaul information comprises overhaul frequency information and overhaul condition information, and the overhaul condition information comprises no faults, general faults and major faults; the overhaul evaluation unit is used for processing overhaul frequency information and overhaul condition information to generate overhaul evaluation information and equipment replacement information, and the overhaul evaluation unit is used for processing the overhaul frequency information and the overhaul condition information to generate the overhaul evaluation information and the equipment replacement information, and the specific process is as follows:
step one: extracting the acquired overhaul frequency information and overhaul condition information, and marking the overhaul frequency information as P;
Step two, a step two is carried out; when the overhaul frequency information P is larger than an overhaul warning value, and the overhaul time difference between the overhaul time point with the nearest time and the overhaul time point with the farthest time is larger than a preset value, directly generating equipment replacement information;
step three: when the overhaul time difference of the overhaul frequency information P is smaller than a preset value when the overhaul warning value is obtained, overhaul condition information of the overhaul frequency information P is extracted;
step four: when the number of major faults in the overhaul condition information of the overhaul frequency information P is more than or equal to 2, generating equipment replacement information;
step five: when the major faults in the overhaul condition information of the overhaul frequency information P are smaller than 2, but the occurrence frequency of the general faults is larger than a preset value, generating equipment replacement information;
Step six: when the major faults in the overhaul condition information of the overhaul frequency information P are smaller than 2, but the occurrence frequency of the general faults is smaller than a preset value, overhaul evaluation information is generated;
Through the process, the overhaul information uploaded by the overhaul personnel at each time can be automatically evaluated, whether the equipment is normal or not can be known by analyzing the overhaul information, and when the equipment is found to be abnormal in overhaul, the technical id sends out reminding information to replace the equipment, so that accidents caused by the abnormality of the equipment are avoided, and the safety of the system is ensured.
The device image acquisition unit is used for acquiring the image information of each device in the zero-loss depth current limiting system, the device image analysis unit is used for analyzing the image information of each device to obtain device cleaning information and device maintenance warning information, and the device image analysis unit analyzes the image information of each device to obtain the device cleaning information and the device maintenance warning information, and the specific process is as follows:
SS1: extracting the image information of each device, and extracting the high-definition picture information of each side of each device from the image information of each device;
SS2: marking the high-definition picture information of each side of each device as a real-time picture G Real world and comparing with a preset standard picture model G Pre-preparation ;
SS3: firstly, carrying out surface color analysis and comparison treatment, and generating equipment cleaning information when color abnormality is found;
SS4: performing appearance comparison on the real-time picture G Real world and a preset standard picture model G Pre-preparation , and generating equipment overhaul warning information when the obtained comparison result is abnormal in appearance;
The specific process of the surface color analysis and comparison treatment is as follows: extracting a preset standard picture model G Pre-preparation , carrying out color extraction on the preset standard picture model G Pre-preparation to obtain color information in x preset standard picture models G Pre-preparation , carrying out color extraction on a real-time picture G Real world to obtain color information of a real-time picture G Real world , extracting area information of a color part when the color information of the real-time picture G Real world and the color information in x preset standard picture models G Pre-preparation are different in color, and identifying color abnormality when the area information of the color part is larger than a preset value.
The specific process of obtaining the abnormal appearance by comparing the appearance of the real-time picture G Real world with the appearance of the preset standard picture model G Pre-preparation is as follows: providing a real-time picture G Real world , providing a preset standard picture model G Pre-preparation from a device surface area Z Real world in the real-time picture G Real world , calculating a difference value Z Pre-preparation between the device surface area Z Real world and the device surface area Z Pre-preparation from a device surface area Z Pre-preparation in a preset standard picture model G Pre-preparation , generating an appearance abnormality when the absolute value of the difference value Z Pre-preparation is larger than a preset value, performing line scanning on the real-time picture G Real world , and generating the appearance abnormality when lines which do not appear in a preset standard picture model G Pre-preparation are scanned in the real-time picture G Real world ;
through the process, the image information of each device is acquired through the image acquisition device, the image information is analyzed, whether the device is corroded and deformed outside can be known, the device is influenced by excessive corrosion, the device is deformed outside, the risk of burning out of the device is represented, when the appearance of the device is abnormal, warning information is timely sent out, and maintenance staff is reminded to maintain or replace the device so as to ensure the use safety.
The environment evaluation unit is used for collecting the environment information of each device in the zero-loss depth current limiting system, wherein the environment information comprises temperature information, humidity information, pollution level and altitude, the environment evaluation unit is used for processing the environment information to generate environment warning information, high-low temperature warning information and water inlet short circuit warning information, and the environment evaluation unit is used for processing the environment information to generate the environment warning information, the high-low temperature warning information and the water inlet short circuit warning information, and the specific process is as follows:
s1: providing the collected environmental information, and acquiring temperature information, humidity information, pollution level and altitude from the environmental information;
s2: the temperature information is marked as W, the temperature information is continuously collected for m times within a preset time period, m is a preset value, and the size of the temperature information is changed according to the requirement;
s3: calculating the average value of m times of temperature information W to obtain a temperature average value W Are all , recording the times d1 of m times of temperature information W larger than a high temperature threshold value and the times d2 of m times of temperature information W smaller than a low temperature threshold value, generating high and low temperature warning information when the temperature average value W Are all is larger than a preset value, and generating high and low temperature warning information when d1 or d2 is larger than the preset times;
S4: extracting humidity information, marking the humidity information as T, continuously collecting m times of humidity information T, and generating water inlet short circuit warning information when the times of which the humidity is greater than a humidity threshold value in the m times of humidity information T exceeds preset times;
S5: extracting the pollution level and the altitude, and generating environment warning information when the pollution level is greater than a preset level or the altitude is higher than the preset altitude;
The use environment conditions of all common equipment comprise that the highest air temperature is less than 60 ℃, the lowest air temperature is more than-40 ℃, the average relative humidity in month is less than 90%, the average relative humidity in day is less than 95%, the average elevation is less than 2000 m, and the pollution grade meets the grade III requirement;
Through automatic monitoring to environmental condition, acquire environmental information, can know the life of each equipment promptly to timely arrangement overhauls or changes, thereby guarantees circuit or equipment safety, reduces unexpected emergence.
The ZXB current limiting device body part is a fast converter and a current limiting reactor, the current limiting reactor is required to use an aluminum foil type dry hollow current limiting reactor, the winding is made of aluminum foil, long-term current passing is met, a weather-resistant insulating material is adopted, an ultraviolet-resistant protective layer is coated on the surface of the current limiting device body part, an exposed metal part is provided with a good anti-corrosion layer, the current limiting device meets the painting standard of an anti-corrosion electrical product, the whole set of current limiting device is simple and compact in structure, long-term operation conditions are met, and the requirement for equipment maintenance is reduced as much as possible.
The specific functions of the ZXB current limiting device comprise:
Automatic exit: the current limiting device is put into a control power supply, the fast converter is automatically switched on after the energy storage capacitor is fully charged, the working current only flows through the fast converter with impedance close to zero, and the current limiting device works in a lossless state.
Fast current limiting: the fast identifier detects working current in real time during normal operation, and once short circuit occurs, judgment is rapidly made within 5-7 ms, the fast converter is controlled to be disconnected within 20ms, and the fast current limiter is put into the depth current limiter to realize fast current limiting.
Automatic recovery: after the short circuit fault is removed, the control device detects that the three-phase working current is recovered to a normal value, a closing command is immediately sent to the rapid converter of the three-phase current limiting unit, the deep current limiter is withdrawn, and the device is recovered to a lossless running state.
And (3) self-healing of faults: when any phase of rapid converter is switched off by mistake, the rapid identifier and the control device immediately control the rapid converter to be switched on, so that the fault self-healing function is realized, and unbalanced operation of the system is prevented.
Remote measurement and control: the control device can exchange data with the upper monitoring system through a data interface.
Event memory: the control device monitors the system current at any time, and once a short-circuit accident occurs, the measurement and control unit reacts quickly and records various parameters during the short-circuit.
A zero-loss deep current limiting method, the method comprising the steps of:
Step one: the ZXB current limiting device is arranged on a circuit or equipment to be monitored, the rapid converter is in a closing state during normal operation, the current limiting reactor is short-circuited, the active and reactive losses of the reactor are zero, the ZXB current limiting device is in a low-impedance zero-loss state, and the control device does not operate;
step two: when a short circuit occurs, the ZXB current limiting device controls the quick current converter to break, the deep current limiting reactor is put into, short circuit current is transferred to the deep current limiter, after the short circuit fault is removed, the control device detects that the three-phase working current is recovered below a set action value, a closing command is immediately sent to the quick current converter of the three-phase current limiting unit, the deep current limiter is withdrawn, and the device is recovered to a zero-loss running state;
Step three: in order to prevent short-time short circuit from influencing the use of equipment in the running process of the ZXB current limiting device, a system current is monitored through a current transformer by an equipment monitoring unit, when the short-circuit fault current is larger than a set amplitude, short-circuit fault current information and short-circuit fault current occurrence time information are obtained, then the short-circuit fault current information and the short-circuit fault current occurrence time information are processed by a monitoring analysis unit to generate fault occurrence information or short-time fault information, and then an abnormal processing unit sends fault sending record information and contact fault control information to the system in the fault occurrence information or the short-time fault information.
Step four: in the running process of the ZXB current limiting device, in order to prevent the equipment from detecting abnormal damage, the overhaul collection unit collects overhaul frequency information and overhaul condition information of the equipment, and the overhaul evaluation unit processes the overhaul frequency information and the overhaul condition information to generate overhaul evaluation information and equipment replacement information;
Step five: in the running process of the ZXB current limiting device, in order to prevent the external rust or damage of the equipment, the image information of each equipment in the zero-loss depth current limiting system is acquired by an equipment image acquisition unit, and then the image information of each equipment is analyzed by an image analysis unit to obtain equipment cleaning information and equipment overhaul warning information;
Step six: in the running process of the ZXB current limiting device, in order to discover the influence of environmental conditions on the use of the device in time, an environment evaluating unit is used for collecting the environmental information of each device in the zero-loss deep current limiting system, and the environment evaluating unit processes the environmental information to generate environment warning information, high-low temperature warning information and water inlet short circuit warning information.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. The zero-loss depth current limiting system is characterized by comprising a ZXB current limiting device, an equipment monitoring unit, a monitoring analysis unit, an abnormality processing unit, an overhaul acquisition unit, an overhaul evaluation unit, an environment monitoring unit, an environment evaluation unit, an equipment image acquisition unit and an equipment image analysis unit;
The ZXB current limiting device comprises an inverter, a current limiting reactor and a control device;
when the system operates normally, the rapid converter is in a closing state, the current limiting reactor is short-circuited, the active and reactive losses of the reactor are zero, the ZXB current limiting device is in a low-impedance zero-loss state, and the control device does not operate;
When a circuit or other equipment is short-circuited, the ZXB current limiting device controls the quick current converter to break, the deep current limiting reactor is put into, short-circuit current is transferred to the deep current limiter, after the short-circuit fault is removed, the control device detects that the three-phase working current is recovered below a set action value, a closing command is immediately sent to the quick current converter of the three-phase current limiting unit, the deep current limiter is withdrawn, and the device is recovered to a zero-loss running state;
the equipment monitoring unit is used for monitoring system current through the current transformer, and acquiring short-circuit fault current information and short-circuit fault current occurrence time information when the short-circuit fault current is larger than a set amplitude value;
the monitoring and analyzing unit is used for processing the short-circuit fault current information and the short-circuit fault current occurrence time length information to generate fault occurrence information or short-time fault information;
The abnormality processing unit is used for sending fault sending record information and contact fault control information to the system when fault occurrence information or short-time fault information is generated;
the overhaul acquisition unit is used for acquiring overhaul information of equipment, wherein the overhaul information comprises overhaul frequency information and overhaul condition information, and the overhaul condition information comprises no faults, general faults and major faults;
the overhaul evaluation unit is used for processing overhaul frequency information and overhaul condition information to generate overhaul evaluation information and equipment replacement information;
The equipment image acquisition unit is used for acquiring image information of each equipment in the zero-loss depth current limiting system, and the equipment image analysis unit is used for analyzing the image information of each equipment to obtain equipment cleaning information and equipment overhaul warning information;
The environment monitoring unit is used for collecting the environment information of each device in the zero-loss deep current limiting system, wherein the environment information comprises temperature information, humidity information, pollution level and altitude, and the environment evaluating unit is used for processing the environment information to generate environment warning information, high-low temperature warning information and water inlet short circuit warning information.
2. A zero loss depth current limiting system according to claim 1, wherein: the current limiting reactor is made of aluminum foil, the winding is made of weather-resistant insulating materials, the surface of the current limiting reactor is coated with an ultraviolet-resistant protective layer, the exposed metal part of the current limiting reactor is coated with an anti-corrosion layer, and the anti-corrosion layer meets the painting standard of anti-corrosion electrical products.
3. A zero loss depth current limiting system according to claim 1, wherein: the specific functions of the ZXB current limiting device comprise:
Automatic exit: the current limiting device is put into a control power supply, the fast converter is automatically switched on after the energy storage capacitor is fully charged, the working current only flows through the fast converter with impedance close to zero, and the current limiting device works in a lossless state;
Fast current limiting: detecting working current in real time when the rapid identifier normally operates, judging once short circuit occurs, and switching off the rapid converter and putting into the deep current limiter;
Automatic recovery: after the short circuit fault is removed, the control device detects that the three-phase working current is recovered to a normal value, and immediately sends a closing command to the rapid converter of the three-phase current limiting unit, the deep current limiter is withdrawn, and the device is recovered to a lossless running state;
And (3) self-healing of faults: when any phase of the rapid converter is switched off by mistake, the rapid identifier and the control device immediately control the rapid converter to be switched on;
Remote measurement and control: the control device exchanges data with the upper monitoring system through a data interface;
event memory: the control device monitors the system current at any time, and when a short circuit accident occurs, the measurement and control unit reacts quickly and records various parameters during the short circuit.
4. A zero loss depth current limiting system according to claim 1, wherein: the specific process of processing the short-circuit fault current information and the short-circuit fault current occurrence time information of the monitoring and analyzing unit to generate fault occurrence information or short-time fault information is as follows: the method comprises the steps of extracting short-circuit fault current information and short-circuit fault current occurrence time length information which are acquired, extracting short-circuit fault current occurrence time length information when the short-circuit fault current information occurs, marking the short-circuit fault current occurrence time length information as Q, generating fault occurrence information when the short-circuit fault current occurrence time length information Q is larger than a preset time length A, and generating short-time fault information when the short-circuit fault current occurrence time length information Q is smaller than A/3.
5. A zero loss depth current limiting system according to claim 1, wherein: the specific process of the overhaul evaluation unit for processing the overhaul frequency information and the overhaul condition information to generate overhaul evaluation information and equipment replacement information is as follows:
step one: extracting the acquired overhaul frequency information and overhaul condition information, and marking the overhaul frequency information as P;
Step two, a step two is carried out; when the overhaul frequency information P is larger than an overhaul warning value, and the overhaul time difference between the overhaul time point with the nearest time and the overhaul time point with the farthest time is larger than a preset value, directly generating equipment replacement information;
step three: when the overhaul time difference of the overhaul frequency information P is smaller than a preset value when the overhaul warning value is obtained, overhaul condition information of the overhaul frequency information P is extracted;
step four: when the number of major faults in the overhaul condition information of the overhaul frequency information P is more than or equal to 2, generating equipment replacement information;
step five: when the major faults in the overhaul condition information of the overhaul frequency information P are smaller than 2, but the occurrence frequency of the general faults is larger than a preset value, generating equipment replacement information;
Step six: and when the major faults in the overhaul condition information of the overhaul frequency information P are smaller than 2, but the occurrence frequency of the general faults is smaller than a preset value, overhaul evaluation information is generated.
6. A zero loss depth current limiting system according to claim 1, wherein: the environment evaluating unit processes the environment information to generate environment warning information, high-low temperature warning information and water inlet short circuit warning information, and the specific process is as follows:
s1: providing the collected environmental information, and acquiring temperature information, humidity information, pollution level and altitude from the environmental information;
s2: the temperature information is marked as W, the temperature information is continuously collected for m times within a preset time period, m is a preset value, and the size of the temperature information is changed according to the requirement;
s3: calculating the average value of m times of temperature information W to obtain a temperature average value W Are all , recording the times d1 of m times of temperature information W larger than a high temperature threshold value and the times d2 of m times of temperature information W smaller than a low temperature threshold value, generating high and low temperature warning information when the temperature average value W Are all is larger than a preset value, and generating high and low temperature warning information when d1 or d2 is larger than the preset times;
S4: extracting humidity information, marking the humidity information as T, continuously collecting m times of humidity information T, and generating water inlet short circuit warning information when the times of which the humidity is greater than a humidity threshold value in the m times of humidity information T exceeds preset times;
S5: and extracting the pollution grade and the altitude, and generating environment warning information when the pollution grade is greater than a preset grade or the altitude is higher than the preset altitude.
7. A zero loss depth current limiting system according to claim 1, wherein: the specific process of analyzing the image information of each device by the device image analysis unit to obtain the device cleaning information and the device overhaul warning information is as follows:
SS1: extracting the image information of each device, and extracting the high-definition picture information of each side of each device from the image information of each device;
SS2: marking the high-definition picture information of each side of each device as a real-time picture G Real world and comparing with a preset standard picture model G Pre-preparation ;
SS3: firstly, carrying out surface color analysis and comparison treatment, and generating equipment cleaning information when color abnormality is found;
SS4: and comparing the appearance of the real-time picture G Real world with that of a preset standard picture model G Pre-preparation , and generating equipment overhaul warning information when the obtained comparison result is abnormal in appearance.
8. The zero loss depth current limiting system of claim 7, wherein: the specific process of the surface color analysis and comparison treatment is as follows: extracting a preset standard picture model G Pre-preparation , carrying out color extraction on the preset standard picture model G Pre-preparation to obtain color information in x preset standard picture models G Pre-preparation , carrying out color extraction on a real-time picture G Real world to obtain color information of a real-time picture G Real world , extracting area information of a color part when the color information of the real-time picture G Real world and the color information in x preset standard picture models G Pre-preparation are different in color, and identifying color abnormality when the area information of the color part is larger than a preset value.
9. The zero loss depth current limiting system of claim 7, wherein: the specific process of obtaining the abnormal appearance by comparing the appearance of the real-time picture G Real world with the appearance of the preset standard picture model G Pre-preparation is as follows: providing a real-time picture G Real world , providing a preset standard picture model G Pre-preparation from a device surface area Z Real world in the real-time picture G Real world , calculating a difference value Z Pre-preparation between the device surface area Z Real world and the device surface area Z Pre-preparation from the device surface area Z Pre-preparation in the preset standard picture model G Pre-preparation , generating an appearance abnormality when the absolute value of the difference value Z Pre-preparation is larger than a preset value, performing line scanning on the real-time picture G Real world , and generating the appearance abnormality when lines which do not appear in the preset standard picture model G Pre-preparation are scanned in the real-time picture G Real world .
10. A zero-loss depth current limiting method is characterized in that: the method is based on a current limiting system according to any of claims 1-9, the method comprising the steps of:
Step one: the ZXB current limiting device is arranged on a circuit or equipment to be monitored, the rapid converter is in a closing state during normal operation, the current limiting reactor is short-circuited, the active and reactive losses of the reactor are zero, the ZXB current limiting device is in a low-impedance zero-loss state, and the control device does not operate;
step two: when a short circuit occurs, the ZXB current limiting device controls the quick current converter to break, the deep current limiting reactor is put into, short circuit current is transferred to the deep current limiter, after the short circuit fault is removed, the control device detects that the three-phase working current is recovered below a set action value, a closing command is immediately sent to the quick current converter of the three-phase current limiting unit, the deep current limiter is withdrawn, and the device is recovered to a zero-loss running state;
Step three: in order to prevent short-time short circuit from influencing the use of equipment in the running process of the ZXB current limiting device, monitoring system current through a current transformer by an equipment monitoring unit, acquiring short-circuit fault current information and short-circuit fault current occurrence time information when the short-circuit fault current is larger than a set amplitude, processing the short-circuit fault current information and the short-circuit fault current occurrence time information by a monitoring analysis unit to generate fault occurrence information or short-time fault information, and sending fault sending record information and contact fault control information to the system by an abnormal processing unit when the fault occurrence information or the short-time fault information;
Step four: in the running process of the ZXB current limiting device, in order to prevent the equipment from detecting abnormal damage, the overhaul collection unit collects overhaul frequency information and overhaul condition information of the equipment, and the overhaul evaluation unit processes the overhaul frequency information and the overhaul condition information to generate overhaul evaluation information and equipment replacement information;
Step five: in the running process of the ZXB current limiting device, in order to prevent the external rust or damage of the equipment, the image information of each equipment in the zero-loss depth current limiting system is acquired by an equipment image acquisition unit, and then the image information of each equipment is analyzed by an image analysis unit to obtain equipment cleaning information and equipment overhaul warning information;
Step six: in the running process of the ZXB current limiting device, in order to discover the influence of environmental conditions on the use of the device in time, an environment evaluating unit is used for collecting the environmental information of each device in the zero-loss deep current limiting system, and the environment evaluating unit processes the environmental information to generate environment warning information, high-low temperature warning information and water inlet short circuit warning information.
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