CN115085160B - Arc light protection system - Google Patents
Arc light protection system Download PDFInfo
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- CN115085160B CN115085160B CN202211003693.0A CN202211003693A CN115085160B CN 115085160 B CN115085160 B CN 115085160B CN 202211003693 A CN202211003693 A CN 202211003693A CN 115085160 B CN115085160 B CN 115085160B
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- arc light
- switch device
- end switch
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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
- H02H7/22—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 distribution gear, e.g. bus-bar systems; for switching devices
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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
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
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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
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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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
- H02H7/04—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 transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
Abstract
The application discloses an arc light protection system, which comprises a plurality of single cabinet protection devices; the single cabinet protection device is used for protecting the power transformation equipment; the single cabinet protection device includes: the device comprises a source end switch device, a load end switch device, a current sensor, a main control module and a plurality of arc light probes. Wherein, master control module includes: the current judging unit is used for sending a tripping signal to the source end switch device or/and the load end switch device when the current value acquired by the current sensor is larger than a preset value; the optical judgment unit is used for sending a tripping signal to the source end switch device or/and the load end switch device when the arc light probe detects arc light; and the history judging unit is used for judging whether a tripping signal needs to be sent to the source end switch device or/and the load end switch device. The application has the advantages that: an arc light protection system is provided which uses a plurality of criteria in combination to protect arc light in advance.
Description
Technical Field
The application relates to an electric power safety protection system, in particular to an arc light protection system.
Background
Short-circuit faults are inevitable in the operation process of the power system, and once an accident occurs, an important task of a relay protection system is realized by taking rapid protection measures and preventing the accident from being expanded. Short-circuit accidents of an electric power system caused by overvoltage, insulation aging, small animals, manual misoperation and the like are often accompanied by generation of arc light, high temperature (the central temperature can reach 20000 ℃) generated by short-circuit electric arc brings serious harm to operation equipment and personal safety, a plurality of pieces of equipment are burnt out if the high temperature is low, and a power distribution network is seriously damaged by economic loss and personal injury.
The prior technical scheme can only carry out trip protection when arc light is generated, but cannot carry out protection in advance so as to avoid the generation of the arc light.
Disclosure of Invention
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
Some embodiments of the present application provide an arc light protection system to solve the technical problems mentioned in the background section above.
Some embodiments of the present application provide an arc light protection system comprising: a plurality of single cabinet protection devices; the single cabinet protection device is used for protecting the power transformation equipment; the power transformation equipment comprises a transformer and a bus connected with the transformer; single cabinet protection device includes: the source end switch device is used for cutting off a line of the transformer on one side of the source end under the control of the first trip signal; the load end switching device is used for cutting off a line of the transformer on one side of the load end under the control of the first tripping signal; the current sensor is used for detecting the current of a line of the transformer on one side of a load end; the arc light probes are used for detecting whether arc light is generated at the bus detection point; the main control module controls the on-off of the source end switch device or/and the load end switch device according to signals fed back by the current sensor and the arc light probe; the main control module is electrically connected with the source end switch device, the load end switch device and the current sensor respectively; the main control module is in optical connection with the arc light probes; the main control module comprises: the current judging unit is used for judging whether the current value acquired by the current sensor is greater than a preset value or not and sending a tripping signal to the source end switch device or/and the load end switch device when the current value acquired by the current sensor is greater than the preset value; the optical judgment unit is used for judging whether the arc light probe detects arc light or not and sending a tripping signal to the source end switch device or/and the load end switch device when the arc light probe detects the arc light; and the history judging unit is used for judging whether a tripping signal needs to be sent to the source end switch device or/and the load end switch device according to the history data of the current value acquired by the current sensor.
Further, single cabinet protection device still includes: the millimeter wave sensor is used for acquiring a millimeter wave image at a bus detection point; the main control module and the millimeter wave sensor form an electric connection.
Further, single cabinet protection device still includes: the communication device is used for enabling the main control module to form data interaction with the outside; wherein, the communication device is electrically connected with the main control module.
Further, the main control module further comprises: the local judgment unit is used for outputting a local image criterion for controlling the on-off of the source end switch device or/and the load end switch device according to the millimeter wave image acquired by the millimeter wave sensor or/and the analysis data based on the image acquired by the millimeter wave sensor; and the main control module controls whether to send a tripping signal to the source end switch device or/and the load end switch device according to the local image criterion of the local judging unit.
Further, the arc light protection system further comprises: the remote server is used for forming data interaction with the main control module through the communication device; the main control module uploads a millimeter wave image acquired by the millimeter wave sensor to the remote server through the communication device, and the remote server generates a remote image criterion which is sent to the main control module according to the millimeter wave image acquired by the millimeter wave sensor.
Further, the main control module further comprises: and the remote judging unit is used for enabling the main control module to send a tripping signal to the source end switch device or/and the load end switch device according to a remote image criterion from the remote server.
Further, the remote server includes: and the single-frame judgment module is used for generating a remote image criterion which is sent to the main control module according to the single-frame image of the millimeter wave image acquired by the millimeter wave sensor.
Further, the single frame judgment module includes: the single-frame analysis unit is used for storing and operating a single-frame analysis model; the single-frame analysis unit inputs a single-frame image of the millimeter wave image into the single-frame analysis model so that the single-frame analysis unit outputs a single-frame risk level and a level confidence coefficient corresponding to the single-frame risk level, and generates a remote image criterion according to the single-frame risk level when the level confidence coefficient is greater than a preset level confidence coefficient threshold; the single-frame analysis model is a neural network model.
Further, the remote server further comprises: and the whole cabinet analysis module is used for generating a remote image criterion which is sent to the main control module according to a plurality of single-frame images of the millimeter wave images acquired by one millimeter wave sensor.
Further, the whole cabinet analysis module comprises: the whole cabinet analysis unit is used for storing and operating a whole analysis model; the whole cabinet analysis unit inputs a risk level matrix formed by a group of single-frame risk levels corresponding to a plurality of millimeter wave sensors of a single cabinet protection device into the whole analysis model so that the whole analysis model outputs a whole cabinet risk probability and a probability confidence coefficient, and generates a remote image criterion according to the whole cabinet risk probability when the probability confidence coefficient is greater than a preset probability confidence coefficient threshold; the overall analysis model is an HMM model.
The beneficial effect of this application lies in: an arc light protection system is provided which uses a plurality of criteria in combination to protect arc light in advance.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and the description of the exemplary embodiments of the present application are provided for explaining the present application and do not constitute an undue limitation on the present application.
Further, throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic and that elements and components are not necessarily drawn to scale.
In the drawings:
FIG. 1 is a system architecture schematic of an arc light protection system according to one embodiment of the present application;
FIG. 2 is a schematic block diagram of a single cabinet protection apparatus according to an embodiment of the present application;
FIG. 3 is a block diagram of a remote server according to one embodiment of the present application;
FIG. 4 is a schematic diagram of a circuit configuration of an arc light protection system according to one embodiment of the present application;
FIG. 5 is a schematic diagram of a risk level matrix according to one embodiment of the present application;
the meaning of the reference numerals:
single cabinet protection devices 101, 102, 103;
a remote server 200;
source end switching devices Q1, Q2;
main transformers B1, B2;
load side switching devices Q3, Q4;
current sensors L1, L2, L3;
bus bars W1, W2;
arc light sensors T1, T2, T3, T4, T5, T6, T7, T8;
and a bus disconnecting switch Q7.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is to be understood that the disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.
It should be noted that, for convenience of description, only the portions related to the related invention are shown in the drawings. The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.
It should be noted that the terms "first", "second", and the like in the present disclosure are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence relationship of the functions performed by the devices, modules or units.
It is noted that references to "a", "an", and "the" modifications in this disclosure are intended to be illustrative rather than limiting, and that those skilled in the art will recognize that "one or more" may be used unless the context clearly dictates otherwise.
The names of messages or information exchanged between devices in the embodiments of the present disclosure are for illustrative purposes only, and are not intended to limit the scope of the messages or information.
The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1 and 2, an arc light protection system of one embodiment of the present application includes a plurality of single cabinet protection devices and a remote server.
The single cabinet protection device is used for protecting power transformation equipment, and the power transformation equipment comprises a transformer and a bus connected with the transformer. The single-cabinet protection device referred to herein is a group of protection devices for protecting a certain power transformation apparatus, not a protection device in a narrow group of electric appliance cabinets. That is, the single-cabinet protection device defined in the present application is an integral protection device required by a substation or a single power transformation measure.
As shown in fig. 2 and 4, as a specific solution, the single cabinet protection device includes: the device comprises a source end switch device, a load end switch device, a current sensor, an arc light probe and a main control module.
Specifically, the source end switch device is used for cutting off a line of the transformer at one side of the source end under the control of a first trip signal; the load side switching device is used for cutting off a line of the transformer on the load side under the control of the first trip signal.
The current sensor is used for detecting the current of a line of the transformer at one side of a load end; a plurality of arc light probes are arranged and used for detecting whether arc light is generated at the bus detection point; and the main control module controls the on-off of the source end switch device or/and the load end switch device according to signals fed back by the current sensor and the arc light probe.
Specifically, the main control module is electrically connected with the source end switch device, the load end switch device and the current sensor respectively; the main control module is optically connected with a plurality of arc light probes.
Specifically, the main control module comprises: a current judging unit, an optical judging unit and a history judging unit. The current judging unit is used for judging whether the current value acquired by the current sensor is larger than a preset value or not and sending a tripping signal to the source end switch device or/and the load end switch device when the current value acquired by the current sensor is larger than the preset value.
The optical judging unit is used for judging whether the arc light probe detects arc light or not and sending a tripping signal to the source end switch device or/and the load end switch device when the arc light probe detects the arc light.
The history judging unit is used for judging whether a tripping signal needs to be sent to the source end switch device or/and the load end switch device according to the history data of the current value acquired by the current sensor.
Specifically, the history determination unit uses a history data manner to calculate a slope of a change in the current value according to the history data of the current value to determine whether a large current occurs to generate the arc light. As a more specific scheme, the main control module performs acquisition according to a certain frequency, and at this time, the condition of sudden current change can be monitored by using a difference value between current values acquired at two adjacent times as a substitute for a slope.
As another scheme, a neural network model may also be used to determine the change of the current value data, and determine whether the current value is rapidly increased to cause arc light.
As shown in fig. 2, as a preferable scheme, the single cabinet protection device further includes: a plurality of millimeter wave sensors and a communication device.
The millimeter wave sensor is used for acquiring a millimeter wave image at a bus detection point; the main control module and the millimeter wave sensor form an electric connection. The communication device is electrically connected with the main control module, and the communication device is used for enabling the main control module to form data interaction with the outside. The millimeter wave sensor can adopt a millimeter wave camera, the influence of ambient light, dust and the like can be firstly ignored in a millimeter wave image acquired by the millimeter wave sensor, and the image expression in the millimeter wave image can be realized through the cable heating condition, so that the temperature change can be acquired.
As a preferred scheme, the main control module further comprises a local judgment unit; the local judgment unit is used for outputting a local image criterion for controlling the on-off of the source end switch device or/and the load end switch device according to the millimeter wave image acquired by the millimeter wave sensor or/and the analysis data based on the image acquired by the millimeter wave sensor; and the main control module controls whether to send a tripping signal to the source end switch device or/and the load end switch device according to the local image criterion of the local judgment unit. The safety protection can be realized locally according to the millimeter wave image rapid judgment, and the protection can be immediate or pre-protected.
As shown in fig. 3, the arc protection system preferably further comprises a remote server.
The remote server is used for forming data interaction with the main control module through the communication device; the main control module uploads a millimeter wave image acquired by the millimeter wave sensor to the remote server through the communication device, and the remote server generates a remote image criterion which is sent to the main control module according to the millimeter wave image acquired by the millimeter wave sensor.
Specifically, the remote server includes a single frame judgment module. The single-frame judgment module is used for generating a remote image criterion which is sent to the main control module according to a single-frame image of the millimeter wave image acquired by the millimeter wave sensor.
As a preferred scheme, the single-frame judgment module comprises a single-frame analysis unit, and the single-frame analysis unit is used for storing and operating a single-frame analysis model; the single-frame analysis unit inputs a single-frame image of the millimeter-wave image into the single-frame analysis model so that the single-frame analysis unit outputs a single-frame risk level and a level confidence coefficient corresponding to the single-frame risk level, and generates a remote image criterion according to the single-frame risk level when the level confidence coefficient is greater than a preset level confidence coefficient threshold; the single-frame analysis model is a neural network model, such as a convolutional neural network, and can be trained by adopting a general image classification model original model, and training data can be acquired and constructed from the conditions of the conventional millimeter wave image and the corresponding arc light generation result. The single-frame judging module is used for judging the condition of a single point. The risk level of a single frame is specifically a numerical value corresponding to the risk level, such as 1 to 5, and the larger the numerical value, the higher the risk level.
In order to relatively standardize the input data of the single-frame analysis model and make the model easy to train and converge, the images of only one or several cables passing large current in the millimeter wave images can be acquired, such as the image of only one cable at the joint, so that a relatively stable image input is easier to form for the neural network model, and an image feature matrix is extracted through the image.
As a preferred scheme, the remote server further comprises a whole cabinet analysis module, and the whole cabinet analysis module is used for generating a remote image criterion which is sent to the main control module according to a plurality of single-frame images of the millimeter wave images acquired by one millimeter wave sensor.
FIG. 5 illustrates a risk level matrix of an embodiment of the present application, in particular, a bin wide analysis module comprising a bin wide analysis unit for storing and running an overall analysis model; the whole cabinet analysis unit inputs a risk level matrix formed by a group of single-frame risk levels corresponding to a plurality of millimeter wave sensors of a single cabinet protection device into the whole analysis model so that the whole analysis model outputs a whole cabinet risk probability and a probability confidence coefficient, and a remote image criterion is generated according to the whole cabinet risk probability when the probability confidence coefficient is greater than a preset probability confidence coefficient threshold.
The ensemble analysis model is an HMM model (hidden markov model). The risk level matrix (each row represents different millimeter wave sensors, and each column represents data of a single-frame risk level corresponding to frame images at different time points) is used as an observable state, and the possible electric arc phenomenon is used as a hidden state, namely the hidden state is only two: arcing light occurs and arcing light does not occur. The probability of transition between implicit states can be calculated from a large amount of historical data. The matrix of the single-frame risk level is taken as a characteristic in the overall analysis model, so that the temperature condition before the arc light occurs can be well reflected, and the analysis result of predicting the arc light in advance is obtained.
When the overall analysis model training is performed, corresponding feature items, such as the single-frame risk level of the present application, can be obtained from the historical data according to the HMM model training, so that a probability relationship between the feature item as a recessive state and whether the arc light occurs as a dominant state is established from the determined result (whether the arc light occurs or not) to establish a transformation. Then, training the HMM model is a well-known technical solution for those skilled in the art, and will not be described herein.
The circuit scheme of the present application is further explained below, specifically in conjunction with an actual power transformation system, as shown in fig. 4.
In fig. 4, main transformers Q1 and Q2 are used to adjust the voltage of the connected high-voltage power supply, and the bus is used to connect the main transformers Q1 and Q2 to a plurality of power supply branches; the main transformers Q1 and Q2 are connected with source end switching devices Q1 and Q2 and load end switching devices Q3 and Q4, the source end switching devices Q1 and Q2 are used for controlling a high-voltage power supply to supply power to the main transformers Q1 and Q2, and the load end switching devices Q3 and Q4 are respectively connected with the main transformers Q1 and Q2 and a bus to control the on-off of the main transformers Q1 and Q2 and the bus.
Specifically, the arc light sensor detects whether or not arc light is generated at a detection point of the bus bars W1 and W2 (the detection point refers to a mounting position of the arc light sensor). The tripping outlet of the main control module is respectively connected with the source end switch devices Q1 and Q2, the load end switch devices Q3 and Q4 and the bus disconnection switch Q7, so that the main control module can control at least one of the source end switch devices Q1 and Q2, the load end switch devices Q3 and Q4 and the bus disconnection switch Q7 to be disconnected according to an arc light signal output by the arc light sensor when the arc light is detected. Specifically, the source end switching devices Q1 and Q2, the load end switching devices Q3 and Q4, and the bus disconnection switch Q7 adopt commonly used switches or trip switches.
By adopting the scheme, whether arc light is generated at the bus detection point is correspondingly detected through the arc light sensor, arc light faults occur at different positions according to detection so as to selectively trip, the power failure range is prevented from being expanded, the power failure range is reduced, unnecessary equipment damage and personal safety accidents are avoided, meanwhile, the fault loss is reduced to the minimum, and conditions are created for rapidly processing faults and recovering power supply.
The arc light sensor adopts a passive light sensing technology with a light filtering function, and the arc light sensor directly transmits arc light signals to the inside of the device through a special optical fiber for processing, so that arc light and common light source signals are effectively distinguished, external photoelectric interference is avoided, and reliability is improved.
Specifically, as a preferable aspect, the single cabinet protection device further includes: the arc light sensor is connected with the main control module through a special communication optical cable and is used for connecting the electric arc light sensors when the number of detection points is larger than a first preset value. Specifically, the first preset value is set to 16, and when the number of the detection points is larger than 16, the arc module is configured.
Specifically, the single cabinet protection device further comprises an arc expansion module, wherein the arc expansion module is used for connecting part of the electric arc sensors when the number of the arc light sensors connected into the arc module is larger than a second preset value; the arc expansion unit is connected with the arc module and/or the main control module. Specifically, the second preset value is set to be 16, which indicates that each arc module can be connected with 16 arc sensors, and if the number of the arc light sensors is larger than the limit that the arc modules can be connected, the arc light sensors are connected by using an arc spreading unit.
An arc light sensor is installed in a bus chamber of each outgoing line cabinet, and a PT cabinet, an isolation cabinet and the like on a bus belong to the bus category. In this application, the arc interface of the main control module is assigned to the detection point of the bus for use, and the arc light sensor number of the detection point of the bus W1 is: T1-T16; the bus bar W2 connects an arc light sensor mounted to a detection point of the bus bar W2 using an arc module, and the arc detection sheet detecting the detection point of the bus bar W2 is numbered as: T17-T32.
Specifically, the current sensor L1 is disposed between the bus W1 and the load side switching device Q3 to collect a current signal; the current sensor L2 is arranged between the bus W2 and the load end switching device Q4 to collect current signals; the current sensor L3 is arranged between the bus W1 and the bus W2 to collect current signals; the current sensors L1, L2 and L3 are respectively connected with the main control module through optical interfaces and optical fibers.
The current sensors L1, L2, L3 are respectively associated with arc light sensors. Specifically, T1-T16 are respectively set to be associated with current sensors L1 and L3; T17-T32 are provided in association with current sensors L2, L3, respectively.
The electric arc light sensor is associated with the corresponding current starting signal in different areas, the system operation mode is automatically judged, and when an electric arc fault occurs, the protective outlet mode is correctly selected, so that good selectivity is achieved; and the double criterion detection technology of arc light and current is adopted, so that the reliability of the arc light protection system 100 is greatly improved, and the starting light intensity and the current threshold of the system can be set.
The following is described in detail with reference to the different modes of operation of the arc light protection system 100:
when the arc protection system 100 employs a split mode of operation:
that is, the main transformers Q1 and Q2 are respectively connected to a high-voltage power supply (hereinafter, for convenience, the high-voltage power supply corresponding to the main transformer Q1 is respectively defined as a first power supply, and the high-voltage power supply corresponding to the main transformer Q2 is defined as a second power supply), and the bus disconnecting switch Q7 is in the disconnected position.
If the position of the bus W1 is failed, a certain probe of an arc light sensor (T1-T16) related to the bus W1 is started, a current sensor L1 is started, the current and arc light dual-criterion starting condition of a first power supply is met, the first power supply arc light protection acts to trip off a load end switch device Q3, and if the failure is not removed within a specified time, the failure protection is started to trip off an upper source end switch device Q1. At this time, the current sensor L3 is not started without a current.
If the position of the bus W2 is failed, starting a certain probe of an arc sensor (T17-T32) related to the bus W2, starting a current sensor L2, meeting the current and arc dual-criterion starting condition of a second power supply, performing arc protection action of the second power supply, tripping off a load-end switch device Q34, and if the fault is not removed within a specified time, starting failure protection and tripping off an upper-level source-end switch device Q2. At this time, the current sensor L3 is not started without a current.
When the arc protection system 100 is operating in a "one-use-one-standby" mode:
a power supply system is provided with a power supply mode that a first power supply and a main transformer Q1 supply power, a bus disconnection switch Q7 is in a closed position, and the first power supply is provided with buses W1 and W2.
If the position of the bus W1 is failed, starting a certain probe of arc sensors (T1-T16) related to the bus W1, starting the current sensor L1, not starting the current sensor L3, meeting the first power supply arc protection action condition, tripping off the load end switching device Q3, and if the fault is not removed within a specified time, starting the failure protection and tripping off the upper source end switching device Q1. At the moment, the bus disconnecting switch does not meet the current starting condition, and the arc protection of the bus disconnecting switch does not act.
If the position of the bus W2 is failed, a certain probe of an arc light sensor (T17-T32) related to the bus W2 is started, a current sensor L1 is started, a current sensor L3 is started, the arc light protection action condition of a bus disconnecting switch is met, a switch of a bus disconnecting switch Q7 is tripped, if the fault is not cut within a specified time, the fault protection is started, and a switch of a source end switch device Q2 at the upper stage is tripped. At this time, if the first power arc protection (load side switching device Q3) does not satisfy the arc start condition (T17 to T32 are not related to the current sensor L1), the protection does not operate.
The operation principle of the power supply mode of the second power supply and the main transformer Q12 is similar to that described above.
When arc light protection system 100 is operating in parallel:
in normal operation, the power supply system rarely adopts a parallel operation mode, but the parallel operation mode exists in the switching operation and abnormal operation states of the system. At this time, the first power supply and the second power supply power simultaneously, the main transformer Q1 and the main transformer Q2 run in parallel, and the bus disconnecting switch Q7 is in a closed position.
If the position of the bus W1 is failed, a certain probe of an arc light sensor (T1-T16) related to the bus W1 is started, a current sensor L1, a current sensor L2 and a current sensor L3 are started simultaneously, the action conditions of first power supply and (bus connection) arc light protection are met, the switches of a load end switch device Q3 and a bus disconnection switch Q7 are tripped, if the fault is not removed within the specified time, failure protection is started, and the switch of an upper source end switch device Q1 or a main transformer Q2 is tripped. At the moment, the second power supply arc protection (the load end switching device Q4) does not meet the arc starting condition (T1-T16 are not related to the current L2), and the protection does not act;
if the position of the bus W2 is failed, a certain probe of an arc light sensor (T17-T32) related to the bus W2 is started, the current sensor L1, the current sensor L2 and the current sensor L3 are started simultaneously, arc light protection action conditions of a second power supply and a bus disconnection switch (bus connection) are met, a load end switch device Q4 and a bus disconnection switch Q7 are tripped, if the fault is not removed within a specified time, failure protection is started, and a superior source end switch device Q2 switch or a source end switch device Q1 switch is tripped. At this time, the first power source arc protection (the load side switching device Q3) does not satisfy the arc start condition (T17 to T32 are not related to the current L1), and the protection does not operate.
Preferably, at least part of the arc light sensors are used to detect detection points on the feeder lines of the bus W1 and the bus W2.
The cable chamber and the switch chamber arc light sensor of feeder pass through the arc light module and insert, and the arc light module mountable realizes arc light information acquisition in the feeder instrument indoor to and export the jump this circuit breaker function on the spot. One arc module can realize the access of an 8-side feeder cabinet arc sensor at most.
More preferably, the arc light sensors of the bus bar W1 and the arc light sensors of the bus bar W2 are connected to different arc modules.
As shown in fig. 2, there are 16 probe access points for each arc module, divided into 1-16. The probes of the 8-plane feeder cabinet can be accessed, wherein 1, 3, 5-15 are accessed with 8 cable room probes, and 2, 4, 6-16 are accessed with corresponding 8 switch room probes. And each arc sensor of the arc light module acquires arc light information of each chamber, and the local outlet is used for jumping the feeder circuit breaker. And as shown in fig. 3, wherein the probes 1 and 2 correspond to the jump out port 1, the probes 3 and 4 correspond to the jump out port 2 \8230; '823030;' and the probes 15 and 16 correspond to the jump out port 8. The aggregate may jump 8 feeder switches.
Considering that arc light of a switch room may occur at the upper end of a feeder switch, and the short-circuit point cannot be cut off even if the feeder switch is tripped open, in order to eliminate a protection dead zone and increase arc light protection of the feeder switch room, after arc light occurs on a switch room probe, an incoming line power switch or a bus disconnection switch is cut off after delay of 50-250 ms (which can be set) through a current criterion.
The trip principle (taking an arc module connected to a bus of the section I as an example) is as follows:
1) The bus is provided with a probe arc light action connected with the switch chamber, if the bus incoming current is detected to start, the connecting line current starts at the same time, and the switch of the switch is tripped to connect the bus and disconnect the bus.
2) The bus is provided with a probe arc light connected with the switch chamber to act, if the current of the I bus incoming line is detected to start, and the current of the connecting line is not started at the same time, the bus switch is jumped.
3) The bus is provided with a probe arc light action connected with the switch chamber, if the bus incoming line current is detected to be not started, the tie line current is started at the same time, and the switch of the bus disconnection switch is jumped.
In addition, connect the arc light module on the II section generating line with the same reason, 2 probes need to be installed to every room of interconnection switch, insert the arc light module on connecting I, II section generating line respectively.
The foregoing description is only exemplary of the preferred embodiments of the disclosure and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention in the embodiments of the present disclosure is not limited to the specific combinations of the above-mentioned features, and other embodiments in which the above-mentioned features or their equivalents are combined arbitrarily without departing from the spirit of the invention are also encompassed. For example, the above features and (but not limited to) the features with similar functions disclosed in the embodiments of the present disclosure are mutually replaced to form the technical solution.
Claims (6)
1. An arc light protection system comprising:
a plurality of single cabinet protection devices; the single cabinet protection device is used for protecting the power transformation equipment; the power transformation equipment comprises a transformer and a bus connected with the transformer;
the single cabinet protection device includes:
the source end switching device is used for cutting off a line of the transformer on one side of the source end under the control of the first tripping signal;
the load end switching device is used for cutting off a line of the transformer on one side of the load end under the control of the first tripping signal;
the current sensor is used for detecting the current of a line of the transformer on one side of a load end;
the arc light probes are used for detecting whether arc light is generated at the bus detection point;
the main control module controls the on-off of the source end switch device or/and the load end switch device according to signals fed back by the current sensor and the arc light probe;
the main control module is electrically connected with the source end switch device, the load end switch device and the current sensor respectively; the main control module and the arc light probes form optical connection;
the master control module comprises:
the current judging unit is used for judging whether the current value acquired by the current sensor is greater than a preset value or not and sending a tripping signal to the source end switch device or/and the load end switch device when the current value acquired by the current sensor is greater than the preset value;
the optical judgment unit is used for judging whether the arc light probe detects arc light or not and sending a tripping signal to the source end switch device or/and the load end switch device when the arc light probe detects the arc light;
the history judging unit is used for judging whether a tripping signal needs to be sent to the source end switch device or/and the load end switch device according to the history data of the current value acquired by the current sensor;
the single cabinet protection device further comprises:
the millimeter wave sensor is used for acquiring a millimeter wave image at a bus detection point;
the main control module is electrically connected with the millimeter wave sensor;
the single cabinet protection device further comprises:
the communication device is used for enabling the main control module to form data interaction with the outside;
the communication device is electrically connected with the main control module;
the master control module further comprises:
the local judging unit is used for outputting a local image criterion for controlling the on-off of the source end switch device or/and the load end switch device according to the millimeter wave image acquired by the millimeter wave sensor or/and analysis data based on the image acquired by the millimeter wave sensor;
the main control module controls whether to send a tripping signal to the source end switch device or/and the load end switch device according to a local image criterion of the local judgment unit;
the arc light protection system further comprises:
the remote server is used for forming data interaction with the main control module through the communication device;
the main control module uploads the millimeter wave image acquired by the millimeter wave sensor to the remote server through the communication device, and the remote server generates a remote image criterion which is sent to the main control module according to the millimeter wave image acquired by the millimeter wave sensor.
2. The arc light protection system of claim 1 wherein:
the master control module further comprises:
and the remote judging unit is used for enabling the main control module to send a tripping signal to the source end switch device or/and the load end switch device according to a remote image criterion from the remote server.
3. The arc light protection system of claim 2 wherein:
the remote server includes:
and the single-frame judgment module is used for generating a remote image criterion which is sent to the main control module according to the single-frame image of the millimeter wave image acquired by the millimeter wave sensor.
4. The arc light protection system of claim 3 wherein:
the single frame judgment module comprises:
the single-frame analysis unit is used for storing and operating a single-frame analysis model;
the single-frame analysis unit inputs a single-frame image of the millimeter-wave image into the single-frame analysis model so that the single-frame analysis unit outputs a single-frame risk level and a level confidence coefficient corresponding to the single-frame risk level, and generates the remote image criterion according to the single-frame risk level when the level confidence coefficient is greater than a preset level confidence coefficient threshold; the single-frame analysis model is a neural network model.
5. The arc light protection system of claim 4, wherein:
the remote server further comprises:
and the whole cabinet analysis module is used for generating a remote image criterion which is sent to the main control module according to a plurality of single-frame images of the millimeter wave images acquired by one millimeter wave sensor.
6. The arc light protection system of claim 5, wherein:
the whole cabinet analysis module comprises:
the whole cabinet analysis unit is used for storing and operating a whole analysis model;
the whole cabinet analysis unit inputs a risk level matrix formed by a group of single-frame risk levels corresponding to a plurality of millimeter wave sensors of one single cabinet protection device into the whole analysis model so that the whole analysis model outputs a whole cabinet risk probability and a probability confidence coefficient, and generates the remote image criterion according to the whole cabinet risk probability when the probability confidence coefficient is greater than a preset probability confidence coefficient threshold; the overall analysis model is an HMM model.
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| CN1129809A (en) * | 1993-08-20 | 1996-08-28 | 尹顿公司 | Arc detection using current variation |
| CN104332960A (en) * | 2014-10-31 | 2015-02-04 | 南京因泰莱电器股份有限公司 | Intelligent arc light protecting system |
| CN109117641A (en) * | 2018-08-15 | 2019-01-01 | 北京理工大学 | A kind of network security risk evaluation method based on I-HMM |
| CN110765858A (en) * | 2019-09-14 | 2020-02-07 | 杭州拓深科技有限公司 | Non-invasive fault arc monitoring method based on convolutional neural network |
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2022
- 2022-08-22 CN CN202211003693.0A patent/CN115085160B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1129809A (en) * | 1993-08-20 | 1996-08-28 | 尹顿公司 | Arc detection using current variation |
| CN104332960A (en) * | 2014-10-31 | 2015-02-04 | 南京因泰莱电器股份有限公司 | Intelligent arc light protecting system |
| CN109117641A (en) * | 2018-08-15 | 2019-01-01 | 北京理工大学 | A kind of network security risk evaluation method based on I-HMM |
| CN110765858A (en) * | 2019-09-14 | 2020-02-07 | 杭州拓深科技有限公司 | Non-invasive fault arc monitoring method based on convolutional neural network |
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