CN112821359B - Protection system for electric line, circuit breaker and protection method for electric line - Google Patents
Protection system for electric line, circuit breaker and protection method for electric line Download PDFInfo
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- CN112821359B CN112821359B CN202011567723.1A CN202011567723A CN112821359B CN 112821359 B CN112821359 B CN 112821359B CN 202011567723 A CN202011567723 A CN 202011567723A CN 112821359 B CN112821359 B CN 112821359B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000012544 monitoring process Methods 0.000 claims abstract description 92
- 230000002159 abnormal effect Effects 0.000 claims abstract description 45
- 238000012545 processing Methods 0.000 claims abstract description 38
- 230000009471 action Effects 0.000 claims abstract description 14
- 230000011664 signaling Effects 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims description 49
- 238000007781 pre-processing Methods 0.000 claims description 15
- 230000005856 abnormality Effects 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 9
- 230000000737 periodic effect Effects 0.000 claims description 6
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 230000000977 initiatory effect Effects 0.000 claims description 2
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- 230000005540 biological transmission Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- 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
- H02J13/00002—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 characterised by monitoring
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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
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The application relates to a protection system for an electric line, a circuit breaker and a protection method for the electric line. The system comprises a monitoring sensor and an operation monitoring sensor, wherein the monitoring sensor comprises a switching value sensor and an operation monitoring sensor, the switching value sensor is used for being connected with a protection execution switch to monitor the switching state of the protection execution switch to obtain a switching value signal, and the operation monitoring sensor is used for being connected with a power utilization line to monitor the operation state of the power utilization line to obtain an operation signal; the input end of the signal acquisition device is connected with the monitoring sensor, and the signal acquisition device is used for acquiring switching value signals and running signals; and the processing device is used for determining whether the power utilization line is abnormal or not based on the switching value signal and the operation signal, and controlling the protection execution switch to carry out tripping action when the power utilization line is abnormal. The system can protect the power utilization line in time.
Description
Technical Field
The application relates to the technical field of electric power safety, in particular to a protection system for an electric power utilization line, a circuit breaker and a protection method for the electric power utilization line.
Background
With the rapid development of power safety, how to protect the power line is also becoming more and more important.
Currently, in order to protect the electric line, a circuit breaker is typically disposed on the electric line, so as to protect the electric line. The protection mechanism of the circuit breaker is to disconnect the power supply on the power line when the power line is short-circuited.
However, the protection mechanism of the current circuit breaker has the problem that the protection of the power utilization line is not timely enough.
Disclosure of Invention
The present application was made based on the recognition and study of the following problems:
the circuit breaker is internally provided with a protection executing switch which is arranged on the power utilization line, and when the power utilization line is short-circuited, the protection executing switch performs tripping operation so as to disconnect the power supply on the power utilization line. The current circuit breaker protects the executive switch and just carries out the tripping operation when the power consumption circuit takes place the short circuit, can not in time protect when the power consumption circuit appears unusual, just can protect the power consumption circuit when waiting to take place the short circuit to the power consumption circuit, leads to the protection of power consumption circuit not enough in time.
In view of the above, it is necessary to provide a protection system for a power line, a circuit breaker, and a protection method for a power line, which can protect the power line in time.
A protection system for an electrical utility line for protecting the electrical utility line, the electrical utility line being provided with a protection execution switch, the system comprising:
the monitoring sensor comprises a switching value sensor and an operation monitoring sensor, wherein the switching value sensor is used for being connected with the protection execution switch to monitor the switching state of the protection execution switch to obtain a switching value signal, and the operation monitoring sensor is used for being connected with the power utilization line to monitor the operation state of the power utilization line to obtain an operation signal;
the input end of the signal acquisition device is connected with the monitoring sensor, and the signal acquisition device is used for acquiring the switching value signal and the running signal;
the input end of the processing device is connected with the output end of the signal acquisition device, the control end of the processing device is connected with the protection execution switch, and the processing device is used for determining whether the power utilization line is abnormal or not based on the switching value signal and the operation signal and controlling the protection execution switch to carry out tripping action when the power utilization line is abnormal.
In one embodiment, the operation monitoring sensor includes at least one of a voltage transformer, a current transformer, and a temperature sensor.
In one embodiment, the signal acquisition device includes:
the input end of the analog-to-digital conversion module is connected with the monitoring sensor, the output end of the analog-to-digital conversion module is connected with the processing device, and the analog-to-digital conversion module is used for converting the switching value signal and the analog signal in the running signal into digital signals to obtain digital monitoring signals;
the processing device is used for determining whether the power utilization line is abnormal or not based on the digital monitoring signal.
In one embodiment, the analog-to-digital conversion module includes:
an analog-to-digital converter for converting an analog signal to a digital signal, the analog-to-digital converter configured with a control register, a status register, a channel selection register, and a result register;
the control register is used for controlling the analog-to-digital converter to start conversion or stop conversion;
the state register is used for controlling the conversion mode of the analog-to-digital converter for signal conversion;
the channel selection register is used for controlling the analog-to-digital converter to receive the analog signal sent by at least one monitoring sensor;
the result register is used for storing the conversion result of the digital-to-analog converter conversion signal.
In one embodiment, the processing device includes:
the digital signal processor is used for receiving the digital monitoring signal, determining whether the power utilization line is abnormal or not based on the digital monitoring signal, and generating a control command when the power utilization line transmits the abnormality;
the input end of the control module is connected with the output end of the digital signal processor, the control end of the control module is connected with the protection execution switch, and the control module is used for controlling the protection execution switch to carry out tripping action after receiving a control command.
In one embodiment, the control module includes:
the input end of the control unit is connected with the output end of the digital signal processor, and the control unit is used for generating a tripping driving signal after receiving a control command;
the signal amplification unit is used for amplifying the tripping driving signal and then sending the signal to the protection execution switch so as to drive the protection execution switch to perform tripping action.
In one embodiment, the operation monitoring sensor includes a voltage transformer and a current transformer, the processing device is further configured to determine electricity information of the electricity line based on a voltage signal monitored by the voltage transformer and a current signal monitored by the current transformer, and the system further includes:
the input end of the communication device is connected with the output end of the processing device, and the communication device is used for transmitting the electricity utilization information to the outside;
the input end of the display device is connected with the output end of the processing device, and the display device is used for displaying the monitoring parameters related to the power utilization line in real time and initiating an alarm prompt when the power utilization line is abnormal.
In one embodiment, the method further comprises:
the input end of the signal preprocessing device is connected with the output end of the monitoring sensor, the output end of the signal preprocessing device is connected with the analog-to-digital conversion module, and the signal preprocessing device is used for filtering out non-periodic components and higher harmonics of at least one of the switching value signal and the state monitoring signal and converting the filtered signals into signal intervals matched with the analog-to-digital conversion module.
A circuit breaker comprising a protection system for a power line as described above.
A method of protecting an electrical line, comprising:
the method comprises the steps of acquiring a switching value signal and an operation signal acquired by a signal acquisition device, wherein the switching value signal is obtained by monitoring the switching state of a protection execution switch through a switching value sensor, the operation signal is obtained by monitoring the operation state of an electric wire through an operation monitoring sensor, and the protection execution switch is arranged on the electric wire;
and determining whether the power utilization line is abnormal or not based on the switching value signal and the operation signal, and controlling the protection execution switch to carry out tripping action when the power utilization line is abnormal.
According to the protection system, the circuit breaker and the protection method of the electric wire line, the switch state of the protection execution switch is monitored through the monitoring sensor to obtain the switch value signal, the operation state of the electric wire line is monitored to obtain the operation signal, the processing device is used for determining whether the electric wire line is abnormal or not through the switch value signal and the operation signal, the protection execution switch is controlled to carry out tripping action when the electric wire line is abnormal, and therefore power supply on the electric wire line is disconnected, the electric wire line can be protected when the electric wire line is abnormal, and timely protection of the electric wire line is achieved.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a protection system for an electrical line according to one embodiment;
FIG. 2 is a schematic diagram of another protection system for an electrical line according to one embodiment;
fig. 3 is a schematic structural diagram of an analog-to-digital conversion module according to an embodiment;
FIG. 4 is a schematic diagram of another protection system for an electrical line according to one embodiment;
FIG. 5 is a schematic diagram of a control module according to an embodiment;
FIG. 6 is a schematic diagram of another protection system for an electrical line according to one embodiment;
fig. 7 is a flow chart of a protection method for a power line according to an embodiment.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments should be understood as "electrical connection", "communication connection", and the like if there is transmission of electrical signals or data between objects to be connected.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a protection system for an electric wire according to an embodiment. In one embodiment, as shown in fig. 1, there is provided a protection system for an electric line on which a protection execution switch 200 is provided, the system including a monitoring sensor 110, a signal acquisition device 120, and a processing device 130, wherein:
the monitoring sensor 110 includes a switching value sensor 111 and an operation monitoring sensor 112, where the switching value sensor 111 is used to connect with the protection execution switch 200 to monitor the switching state of the protection execution switch 200 to obtain a switching value signal, and the operation monitoring sensor 112 is used to connect with the power line to monitor the operation state on the power line to obtain an operation signal. The input end of the signal acquisition device 120 is connected with the monitoring sensor 110, and the signal acquisition device 120 is used for acquiring the switching value signal and the running signal. The input end of the processing device 130 is connected to the output end of the signal acquisition device 120, the control end of the processing device 130 is connected to the protection execution switch 200, and the processing device 130 is configured to determine whether the power consumption line is abnormal based on the switching value signal and the operation signal, and control the protection execution switch 200 to perform a trip action when the power consumption line is abnormal.
The signal from the switching value sensor 111 is a contact signal, and has two states of open and close. In the present embodiment, the switching amount sensor 111 monitors whether the protection execution switch 200 is in the closed state or in the open state, thereby obtaining the switching amount signal. Specifically, the power line is normally operated when the protection execution switch 200 is in the closed state, and is stopped when the protection execution switch 200 is in the open state. In the present embodiment, the operation monitoring sensor 112 is used to monitor the operation state on the electric wire. Optionally, the operating state includes, but is not limited to, voltage, current, temperature, etc., and the embodiment is not limited to a specific operating state.
Specifically, the switching value sensor 111 monitors the switching state of the protection execution switch 200 in real time, and obtains a switching value signal. At the same time, the operation monitoring sensor 112 monitors the operation state of the power line to obtain an operation signal. The signal acquisition device 120 acquires the switching value signal and the operation signal and then sends the switching value signal and the operation signal to the processing device 130, and the processing device 130 determines whether the power consumption line is abnormal or not based on the switching value signal and the operation signal. When the processing device 130 determines that the electric wire line is abnormal, the processing device 130 controls the protection switch to perform the tripping operation, thereby cutting off the power supply of the electric wire line to protect the electric wire line.
In this embodiment, the monitoring sensor 110 monitors the on/off state of the protection execution switch 200 to obtain the on/off signal, monitors the operation state of the power line to obtain the operation signal, and uses the on/off signal and the operation signal to determine whether the power line is abnormal through the processing device 130, and controls the protection execution switch 200 to perform the tripping operation when the power line is abnormal, so as to disconnect the power supply on the power line.
In the present embodiment, how the processing device 130 uses the switching value signal and the operation signal to determine whether or not the power line is abnormal is not particularly limited. For example, when the switch quantity signal characterizes that the protection execution switch 200 is in a closed state, whether the operation signal is greater than a corresponding set threshold value is judged, and if the operation signal is greater than the corresponding set threshold value, the abnormality of the power consumption line is determined.
It can be understood that, if the power consumption line is abnormal, the operation signal is used to determine if the power consumption line is abnormal when the switch quantity signal represents that the protection execution switch 200 is in the closed state, and if the switch quantity signal represents that the protection execution switch 200 is in the open state, the abnormality determination of the power consumption line is not performed, so that the computing resource can be saved. After the control protection execution switch 200 performs the trip operation, it is also possible to determine whether or not the power supply to the power line is cut off by the switching amount sensor 111.
Optionally, the operation monitoring sensor 112 includes one or more. In one embodiment, the operation monitoring sensor 112 includes, but is not limited to, at least one of a voltage transformer, a current transformer, and a temperature sensor.
In this embodiment, the voltage transformer is used to monitor the voltage on the wire to obtain the voltage signal. The voltage signal characterizes the voltage level of the power line. The current transformer is used for monitoring the current on the wire to obtain a current signal. The current signal characterizes the current magnitude of the power line. The temperature sensor is used for monitoring the temperature of the wire to obtain a temperature signal. The temperature signal characterizes the temperature of the power line. It will be appreciated that when
Specifically, if the voltage is greater than the preset voltage, the voltage on the power line is considered to be abnormal; if the current is larger than the preset current, the current on the power line is considered to be abnormal; if the temperature is greater than the preset temperature, the temperature on the power utilization line is considered to be abnormal.
Optionally, the monitoring sensors 110 are one or more groups. In one embodiment, the monitoring sensors 110 are in multiple groups. The plurality of sets of monitoring sensors 110 are used to monitor different power usage lines or to monitor different portions of the same power usage line, without limitation. By providing a plurality of sets of monitoring sensors 110, abnormal power lines can be located among a plurality of power lines; or locating a specific abnormal position when the power line is abnormal.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another protection system for an electric wire according to an embodiment. In one embodiment, as shown in fig. 2, the signal acquisition device 120 includes an analog-to-digital conversion module 121, where:
the input end of the analog-to-digital conversion module 121 is connected with the monitoring sensor 110, the output end of the analog-to-digital conversion module 121 is connected with the processing device 130, and the analog-to-digital conversion module 121 is configured to convert the switching value signal and the analog signal in the operation signal into digital signals, so as to obtain digital monitoring signals. The processing device 130 is configured to determine whether an abnormality occurs in the power line based on the digital monitoring signal.
The digital monitoring signal refers to a set of all digital signals obtained through monitoring. Specifically, the digital monitoring signal includes a digital signal to be converted by the analog-to-digital conversion module 121 and a monitored digital signal. For example, the switching value signal may be a digital signal, and the switching value signal has two states, 1 and 0, representing whether the protection performing switch 200 is in the open state or the closed state. The voltage signal and the current signal are analog signals, and are converted by the analog-to-digital converter 1211 to obtain digital signals.
In the present embodiment, the processing device 130 determines whether an abnormality occurs in the power line based on the digital monitor signal. Specifically, the processing device 130 may restore some or all of the digital signals of the digital monitoring signal to analog signals, so as to determine whether an abnormality occurs in the power line.
Alternatively, the analog-to-digital conversion module 121 converts an analog signal into a digital signal, which may be one of the analog signals in a time-sharing manner, or may convert all the analog signals simultaneously, which is not limited herein. In one embodiment, the monitoring sensors 110 are multiple groups, and only one analog-to-digital conversion module 121 is needed to convert analog signals obtained by monitoring the multiple groups of monitoring sensors 110 through one analog-to-digital conversion module 121, so that the analog-to-digital conversion module 121 can convert analog signals obtained by monitoring one group of the multiple groups of monitoring sensors 110 in a time-sharing manner, or can convert analog signals obtained by the multiple groups of monitoring sensors 110 at the same time, which is not limited herein.
It should be noted that, the analog signal obtained by monitoring may be collected by the analog-to-digital conversion module 121, and the digital signal obtained by monitoring may be collected by the digital signal collection card, so that the digital signal collected by the digital signal collection card and the set of digital signals obtained by conversion by the analog-to-digital conversion module 121 are sent to the processing device 130 as the digital monitoring signal.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an analog-to-digital conversion module 121 according to an embodiment. In one embodiment, analog-to-digital conversion module 121 includes analog-to-digital converter 1211, wherein:
the conversion method is a method in which the analog-to-digital converter 1211 converts a signal. In particular, the conversion means includes, but is not limited to, the sampling rate and resolution of the signal conversion by the analog-to-digital converter 1211. The sampling frequency fs of the analog-to-digital converter 1211 should be greater than 2Wa (Wa is the bandwidth of the signal being sampled) according to the sampling theorem. In practice, fs >2.5Wa is generally chosen due to the effects of non-linearities, quantization noise, distortion, and receiver noise of the analog-to-digital converter 1211. The bit number of the sampling value is selected to meet the requirements of a certain dynamic range and digital part processing precision, and the dynamic range with the resolution of 80dB is generally not lower than 12 bits.
In this embodiment, the monitoring sensor 110 is connected to one analog-to-digital converter 1211, and the channel selection register controls the transmission path between the analog-to-digital converter 1211 and the monitoring sensor 110 to be opened or closed, so that the analog-to-digital converter 1211 is controlled to receive the analog signal transmitted by at least one of the monitoring sensors 110, and the analog-to-digital converter 1211 is caused to convert the received analog signal into a digital signal. Specifically, analog-to-digital converter 1211 may receive an analog signal when the transmission path is on. Alternatively, when the monitoring sensors 110 are multiple groups, the multiple groups of monitoring sensors 110 share one analog-to-digital converter 1211, and then the channel selection register may further control the analog-to-digital converter 1211 to receive the analog signal sent by one of the multiple groups of monitoring sensors 110 in a time-sharing manner.
In the present embodiment, the operation state of the analog-to-digital converter 1211 is controlled by the register, and the analog-to-digital converter 1211 can be adjusted as needed, improving convenience.
Referring to fig. 4, fig. 4 is a schematic structural diagram of another protection system for an electric wire according to an embodiment. In one embodiment, as shown in fig. 4, the processing device 130 includes a digital signal processor 131 and a control module 132, wherein:
the digital signal processor 131 is configured to receive the digital monitoring signal, determine whether the power line is abnormal based on the digital monitoring signal, and generate a control command when the power line is abnormal; the input end of the control module 132 is connected to the output end of the digital signal processor 131, the control end of the control module 132 is connected to the protection execution switch 200, and the control module 132 is configured to control the protection execution switch 200 to perform a trip action after receiving a control command.
The dsp 131 is a processor composed of a large-scale or very large-scale integrated circuit chip for performing a task of processing a digital signal.
Specifically, after the digital signal processor 131 receives the digital monitoring signal, it determines whether the power line is abnormal, and if it is determined that the power line is abnormal, a control command is generated and sent to the control module 132. After receiving the control command, the control module 132 controls the protection execution switch 200 to perform a tripping operation. In the present embodiment, the manner how the control module 132 controls the protection execution switch 200 to perform the tripping operation is not particularly limited.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a control module 132 according to an embodiment. In one embodiment, as shown in fig. 5, the control module 132 includes a control unit 1321 and a signal amplifying unit 1322, wherein:
an input end of the control unit 1321 is connected to an output end of the digital signal processor 131, and the control unit 1321 is configured to generate a trip driving signal after receiving a control command; the input end of the signal amplification unit 1322 is connected to the output end of the control unit 1321, the output end of the signal amplification unit 1322 is connected to the protection executing switch 200, and the signal amplification unit 1322 is configured to amplify the trip driving signal and send the amplified trip driving signal to the protection executing switch 200, so as to drive the protection executing switch 200 to perform a trip action.
In this embodiment, the trip drive signal may be a current signal. The signal amplifying unit 1322 amplifies the trip driving signal and transmits the amplified trip driving signal to the protection executing switch 200, thereby driving the protection executing switch 200 to perform a trip operation. Specifically, the protection performing switch 200 is disposed on the power line, and when the current transmitted to the protection performing switch 200 is sufficiently large, a sufficiently large electromagnetic field is generated, and the generated electromagnetic field can drive the protection performing switch 200 to perform a trip operation, thereby cutting off the power supply on the power line.
In this embodiment, the control unit 1321 generates the trip driving signal after receiving the control command, and drives the protection executing switch 200 to perform the trip operation after amplifying the signal amplifying unit 1322, so that the control unit 1321 can control the protection executing switch 200 to perform the trip operation even if the control unit 1321 outputs a small current.
In one embodiment, the operation monitoring sensor 112 includes a voltage transformer and a current transformer, and the processing device 130 is further configured to determine the electricity consumption information of the electricity consumption line based on the voltage signal monitored by the voltage transformer and the current signal monitored by the current transformer.
In the present embodiment, the electricity consumption information includes, but is not limited to, electric energy information, active power information, voltage information, current information, power factor information, and the like. Specifically, the voltage information and the current information can be directly monitored, and the electric energy information, the active power information and the power factor information can be obtained through calculation of the voltage information and the current information.
The embodiment not only can protect the power utilization line, but also can meter the power utilization on the power utilization line.
Referring to fig. 6, fig. 6 is a schematic structural diagram of another protection system for an electric wire according to an embodiment. In this embodiment, the operation monitoring sensor 112 includes a voltage transformer and a current transformer, and as shown in fig. 6, the system further includes at least one of a communication device 140 and a display device 150. Wherein:
an input end of the communication device 140 is connected to an output end of the processing device 130, and the communication device 140 is configured to transmit the electricity consumption information to the outside. The input end of the display device 150 is connected to the output end of the processing device 130, and the display device 150 is configured to display the monitoring parameters related to the power line in real time, and initiate an alarm prompt when an abnormality occurs in the power line.
In the present embodiment, the outside is relative to the system, and for example, the outside may be a server, and the present embodiment is not limited. In this embodiment, the display module may use a liquid crystal screen to implement a man-machine interaction interface, and display various monitoring parameters. When the power utilization line works normally, working information such as voltage, current, active power, reactive power, power factor and the like of the power utilization line can be displayed; when an abnormality occurs in the electric wire, abnormality information such as an abnormality type, an abnormality voltage, an abnormality current, and an abnormality temperature of the electric wire can be displayed. The digital signal processor 131 is connected with the read-write signal led out by the control panel of the liquid crystal screen in an address bus mode, the read-write signal led out by the control panel of the liquid crystal screen is directly connected with the data bus of the digital signal processor 131, and the time sequence is automatically waited for in an external state by hardware expansion by utilizing the Ready pin of the digital signal processor 131, so that the time sequence between the digital signal processor 131 and the liquid crystal screen is matched.
With continued reference to fig. 6, in one embodiment, the system further includes a signal preprocessing device 160. The input end of the signal preprocessing device 160 is connected with the output end of the monitoring sensor 110, the output end of the signal preprocessing device 160 is connected with the analog-to-digital conversion module 121, and the signal preprocessing device 160 is used for filtering out the non-periodic component and the higher harmonic of at least one of the switching value signal and the state monitoring signal, and converting the filtered signal into a signal section matched with the analog-to-digital conversion module 121.
In this embodiment, the signal interval matched by the analog-to-digital conversion module 121 refers to a signal interval suitable for the analog-to-digital conversion module 121 to operate. For example, the signal interval for analog-to-digital conversion matching may be a 0V-3V voltage signal. The signal interval of the present embodiment is related to the analog-to-digital conversion module 121, and the present embodiment is not particularly limited. The signal preprocessing device 160 of the present embodiment is used for filtering out non-periodic components and higher harmonics in the analog signal, and if the signal is a digital signal, the signal preprocessing device 160 is also used for filtering out clutter in the digital signal. Specifically, the signal preprocessing device 160 includes an analog signal filtering module and a digital signal filtering module. The analog signal filtering module is used for filtering out non-periodic components and higher harmonics in the analog signal, and the digital signal filtering module is used for filtering out clutter in the digital signal.
In this embodiment, the signal preprocessing device 160 filters out the non-periodic component and the higher harmonic of the analog signal in the switching value signal and the state monitoring signal, and then determines whether the electrical line is abnormal by the filtered signal, so that the accuracy of determination can be improved. In addition, by converting the signal into the signal section matched with the analog-to-digital conversion module 121, the analog-to-digital conversion module 121 can be protected, and the working stability and safety of the analog-to-digital conversion module 121 can be improved.
With continued reference to FIG. 6, in one embodiment, optionally, the system further comprises a functional extension device 170. The function expanding device 170 is connected to the digital signal processor 131, and the function expanding device 170 is used for adding a new function.
In the present embodiment, when a new function needs to be added to the system, the addition is performed by the function expanding device 170. The embodiment improves the adaptability of the system by setting the function expanding device 170 as an interface for adding the new function.
In an embodiment, optionally, the system is further provided with an expansion interface, the expansion interface is connected with the digital signal processor 131, and the expansion interface is used as a connection medium of the newly added sensor.
In one embodiment, a circuit breaker is provided, the circuit breaker of this embodiment including a protection system for a power line. The protection system for the electrical line may refer to any of the above embodiments, and this embodiment is not described in detail.
Referring to fig. 7, fig. 7 is a flow chart of a protection method for a power line according to an embodiment. In one embodiment, as shown in fig. 7, there is provided a protection method for an electric line, including:
step 710, acquiring a switching value signal and an operation signal acquired by a signal acquisition device, wherein the switching value signal is obtained by monitoring the switching state of a protection execution switch through a switching value sensor, the operation signal is obtained by monitoring the operation state of an electric wire through an operation monitoring sensor, and the protection execution switch is arranged on the electric wire.
Wherein the switching value signal characterizes whether the protection execution switch is in an open state or in a closed state. The operational signal characterizes an operational state on the electrical line.
And step 720, determining whether the power utilization line is abnormal or not based on the switching value signal and the operation signal, and controlling the protection executing switch to carry out tripping action when the power utilization line is abnormal.
In this step, specifically, when the switching value signal indicates that the protection execution switch is in the closed state, it is determined whether the operation state of the power line is abnormal according to the operation signal.
In one embodiment, optionally, the step of determining whether the operation state of the power line is abnormal according to the operation signal includes:
and if the operation signal is larger than the corresponding threshold value, determining that the power utilization line is abnormal. For example, if the voltage is greater than the preset voltage, the voltage on the power line is considered to be abnormal; if the current is larger than the preset current, the current on the power line is considered to be abnormal; if the temperature is greater than the preset temperature, the temperature on the power utilization line is considered to be abnormal.
It should be understood that, although the steps in the flowchart of fig. 7 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least a portion of the steps in fig. 7 may include a plurality of steps or stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily sequential, but may be performed in rotation or alternatively with at least a portion of the steps or stages in other steps or other steps.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, 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 invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (8)
1. A protection system for an electrical utility line, for protecting the electrical utility line, the electrical utility line being provided with a protection execution switch, the system comprising:
the monitoring sensor comprises a switching value sensor and an operation monitoring sensor, the switching value sensor is used for being connected with the protection execution switch to monitor the switching state of the protection execution switch to obtain a switching value signal, the operation monitoring sensor is used for being connected with the power utilization line to monitor the operation state of the power utilization line to obtain an operation signal, and the operation signal comprises a voltage signal and a current signal;
the input end of the signal acquisition device is connected with the monitoring sensor, and the signal acquisition device is used for acquiring the switching value signal and the running signal;
the processing device is used for detecting whether the operation signal is greater than a corresponding set threshold value or not when the switching value signal represents that the protection execution switch is in a closed state, if yes, determining that an electric line is abnormal and controlling the protection execution switch to carry out tripping action; the processing device is further used for acquiring electricity consumption information of the electricity consumption line based on the voltage signal and the current signal, wherein the electricity consumption information comprises electric energy information, active power information, voltage information, current information and power factor information;
the system also comprises a communication device, wherein the input end of the communication device is connected with the output end of the processing device, and the communication device is used for transmitting the electricity consumption information to the outside;
the system further comprises: the input end of the signal preprocessing device is connected with the output end of the monitoring sensor, the output end of the signal preprocessing device is connected with the signal acquisition device, the signal preprocessing device is used for filtering out non-periodic components and higher harmonics of at least one of the switching value signal and the state monitoring signal, the filtered signals can be converted into signal intervals matched with the signal acquisition device, and if the signals are digital signals, the signal preprocessing device is also used for filtering clutter in the digital signals;
the signal acquisition device includes: the input end of the analog-to-digital conversion module is connected with the monitoring sensor, the output end of the analog-to-digital conversion module is connected with the processing device, and the analog-to-digital conversion module is used for converting the switching value signal and the analog signal in the running signal into digital signals to obtain digital monitoring signals;
the processing device comprises: the digital signal processor is used for receiving the digital monitoring signal, determining whether the power utilization line is abnormal or not based on the digital monitoring signal, and generating a control command when the power utilization line transmits the abnormality; the input end of the control module is connected with the output end of the digital signal processor, the control end of the control module is connected with the protection execution switch, and the control module is used for controlling the protection execution switch to carry out tripping action after receiving a control command;
the control module includes: the input end of the control unit is connected with the output end of the digital signal processor, and the control unit is used for generating a tripping driving signal after receiving a control command, wherein the tripping driving signal is a current signal; the signal amplification unit is used for amplifying the tripping driving signal and then sending the tripping driving signal to the protection execution switch so as to drive the protection execution switch to perform tripping action;
the analog-to-digital conversion module includes:
an analog-to-digital converter for converting an analog signal to a digital signal, the analog-to-digital converter configured with a control register, a status register, a channel selection register, and a result register;
the control register is used for controlling the analog-to-digital converter to start conversion or stop conversion;
the state register is used for controlling the conversion mode of the analog-to-digital converter for signal conversion;
the channel selection register is used for controlling the analog-to-digital converter to receive the analog signal sent by at least one monitoring sensor;
the result register is used for storing the conversion result of the analog-to-digital converter conversion signal.
2. The system of claim 1, wherein the operation monitoring sensor comprises at least one of a voltage transformer, a current transformer, and a temperature sensor.
3. The system of claim 1, wherein the system further comprises:
the input end of the display device is connected with the output end of the processing device, and the display device is used for displaying the monitoring parameters related to the power utilization line in real time and initiating an alarm prompt when the power utilization line is abnormal.
4. The system of claim 1, further comprising a function expansion device coupled to the digital signal processor for adding a new function.
5. The system of claim 4, further provided with an expansion interface connected to the digital signal processor for use as a connection medium for a new sensor.
6. The system of claim 1, wherein the analog-to-digital converter samples at a frequency greater than 2.5Wa when converting the signal, wherein Wa is the bandwidth of the sampled signal.
7. A circuit breaker comprising a protection system for a power line according to any one of claims 1-6.
8. A method of protecting an electrical line, applied to a system according to any one of claims 1 to 6, comprising:
the method comprises the steps of acquiring a switching value signal and an operation signal acquired by a signal acquisition device, wherein the switching value signal is obtained by monitoring the switching state of a protection execution switch through a switching value sensor, the operation signal is obtained by monitoring the operation state of an electric wire through an operation monitoring sensor, and the protection execution switch is arranged on the electric wire;
and determining whether the power utilization line is abnormal or not based on the switching value signal and the operation signal, and controlling the protection execution switch to carry out tripping action when the power utilization line is abnormal.
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| CN205791462U (en) * | 2016-06-06 | 2016-12-07 | 国网天津市电力公司 | It is applicable to the transformator broken neutral line monitoring system of low-voltage network |
| KR20180075348A (en) * | 2016-12-26 | 2018-07-04 | 전광현 | Current monitoring board and control method thereof |
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| JP5694006B2 (en) * | 2011-03-07 | 2015-04-01 | 株式会社東芝 | Monitoring device |
| CN106646309A (en) * | 2016-11-14 | 2017-05-10 | 国网江苏省电力公司淮安供电公司 | Precision detection device of arc light detector |
| CN208723528U (en) * | 2018-09-11 | 2019-04-09 | 湖南电气职业技术学院 | A kind of low-voltage circuit breaker intelligent controller |
| CN110535243A (en) * | 2019-09-26 | 2019-12-03 | 浙江涵普电力科技有限公司 | A kind of intelligent comprehensive protection supervisory equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205791462U (en) * | 2016-06-06 | 2016-12-07 | 国网天津市电力公司 | It is applicable to the transformator broken neutral line monitoring system of low-voltage network |
| KR20180075348A (en) * | 2016-12-26 | 2018-07-04 | 전광현 | Current monitoring board and control method thereof |
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