CN112165172B - Power distribution detection device and method - Google Patents
Power distribution detection device and method Download PDFInfo
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- CN112165172B CN112165172B CN202011085840.4A CN202011085840A CN112165172B CN 112165172 B CN112165172 B CN 112165172B CN 202011085840 A CN202011085840 A CN 202011085840A CN 112165172 B CN112165172 B CN 112165172B
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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
- H02J13/00001—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 the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
- H02J13/00006—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 information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—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 information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Computer Networks & Wireless Communication (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention is applicable to the technical field of safety of power system operation, and provides a power distribution detection device and a method, wherein the power distribution detection device comprises: the man-machine interaction module is used for parameter setting; the comprehensive monitoring module collects and gathers information and performs fault judgment and operation on the obtained information; the communication module is used for transmitting information to the outside; the action module is connected with the man-machine interaction module, the comprehensive monitoring module and the communication module and used for controlling, switching on and off, alarming and resetting data; the power supply module is used for providing operation energy to realize the data acquisition of the equipment operation state under the power system, so that the power system fault caused by the dead application software can be avoided, and the working complexity of operators in the power industry can be reduced.
Description
Technical Field
The invention belongs to the technical field of safety of operation of an electric power system, and particularly relates to an electric power distribution detection device and method.
Background
The monitoring of power faults is very important to the field of power application, and in some special application scenarios, the occurrence of power faults means a great loss of resource property, so the monitoring of power faults is very important at present. There are many factors that cause power failure, and power failure due to a short circuit and abnormal power quality belongs to electrical data failure among power failures. Along with the access of the automation system to the power application scene, whether the operation of the automation system is correct or not gradually starts to cause the generation of power faults, and the faults belong to the faults of power system equipment. In recent years, a system network of distributed application is rapidly popularized in the power industry, especially in some application scenes with high requirements on electric power safety coefficient, such as national defense, medical treatment, large-scale heavy industry and the like. Current power monitoring basically monitors electrical data such as voltage, current, phase, etc. of the application scenario. But no product has been equipped with a system that can monitor the running state of the distributed application, and in particular whether the running logic state inside the distributed application is normal.
Disclosure of Invention
An embodiment of the invention aims to provide a power distribution detection device, which aims to solve the problem of whether a monitoring logic state is normal or not.
The embodiment of the invention is realized in that a power distribution detection apparatus includes:
the man-machine interaction module is used for parameter setting;
the comprehensive monitoring module collects and gathers information and performs fault judgment and operation on the obtained information;
the communication module is used for transmitting information to the outside;
the action module is connected with the man-machine interaction module, the comprehensive monitoring module and the communication module and used for controlling;
a power module for providing operating energy;
the action module controls the man-machine interaction module to switch and alarm and clears data.
In the embodiment of the invention, the man-machine interaction module is used for parameter setting of the monitoring system, and the main setting values are as follows: the number of connected devices, the number of distributed applications corresponding to each device, and the alarm threshold and alarm outlet of each distributed application. The system needs to be in butt joint with the automation equipment in the actual application site and performs information interaction, and if the system is a method for installing physical wiring, a communication line of the automation equipment is connected to a communication module, or the system uses the opening amount of the automation equipment to be connected to the communication module, so that the state of the corresponding distributed application is reported by the automation equipment. If the system is transplanted and installed, the system is needed to be embedded into corresponding automation equipment, a count value is added into corresponding distributed application, namely each application runs once, and the count value is added by 1. And acquiring data of the accessed automation equipment, acquiring the running states and the running data of all physical equipment forming the distributed reference, and if the physical wiring installation method is adopted, periodically sending an information uploading instruction to the automation equipment, polling all the automation equipment states, and storing the states corresponding to all the equipment in a data matrix of one equipment state for use by the comprehensive monitoring module, thereby realizing the data acquisition of the accessed equipment. If the system is transplanted, the data in the data matrix corresponding to the distributed application is added one by creating a one-dimensional data matrix with the length of the matrix which is the number of the distributed application, and the corresponding distributed application is operated once. And transmitting the data matrix to the integrated monitoring module. After receiving all the data matrixes of the distributed application, performing comprehensive state monitoring at regular time, comparing the data in the data matrix with a corresponding alarm threshold set in the man-machine interaction module, and if the data is larger than the set alarm threshold, clearing the data of the data matrix and waiting for the arrival of the next timer period. If the data is smaller than the set alarm threshold, the application is considered to be in an abnormal running state, namely, the comprehensive state monitoring equipment transmits corresponding alarm information to the communication module and the man-machine interaction interface. And performing fault processing on the alarm according to the set alarm outlet. The action module checks whether there is action information transmitted from the integrated status monitoring module. The action module performs a corresponding action. The method can realize the data acquisition of the running state of the equipment under the power system, can avoid the power system fault caused by the dead application software, and can reduce the working complexity of operators in the power industry.
Drawings
Fig. 1 is a block diagram of a power distribution detecting device according to an embodiment of the present invention;
fig. 2 is a flowchart of a power distribution detecting device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Specific implementations of the invention are described in detail below in connection with specific embodiments.
As shown in fig. 1-2, a block diagram of a power distribution detecting device according to an embodiment of the present invention includes:
the man-machine interaction module is used for parameter setting;
the comprehensive monitoring module collects and gathers information and performs fault judgment and operation on the obtained information;
the communication module is used for transmitting information to the outside;
the action module is connected with the man-machine interaction module, the comprehensive monitoring module and the communication module and used for controlling;
a power module for providing operating energy;
the action module controls the man-machine interaction module to switch and alarm and clears data.
In the embodiment of the invention, the man-machine interaction module is used for parameter setting of the monitoring system, and the main setting values are as follows: the number of connected devices, the number of distributed applications corresponding to each device, and the alarm threshold and alarm outlet of each distributed application. The system needs to be in butt joint with the automation equipment in the actual application site and performs information interaction, and if the system is a method for installing physical wiring, a communication line of the automation equipment is connected to a communication module, or the system uses the opening amount of the automation equipment to be connected to the communication module, so that the state of the corresponding distributed application is reported by the automation equipment. If the system is transplanted and installed, the system is needed to be embedded into corresponding automation equipment, a count value is added into corresponding distributed application, namely each application runs once, and the count value is added by 1. And acquiring data of the accessed automation equipment, acquiring the running states and the running data of all physical equipment forming the distributed reference, and if the physical wiring installation method is adopted, periodically sending an information uploading instruction to the automation equipment, polling all the automation equipment states, and storing the states corresponding to all the equipment in a data matrix of one equipment state for use by the comprehensive monitoring module, thereby realizing the data acquisition of the accessed equipment. If the system is transplanted, the data in the data matrix corresponding to the distributed application is added one by creating a one-dimensional data matrix with the length of the matrix which is the number of the distributed application, and the corresponding distributed application is operated once. And transmitting the data matrix to the integrated monitoring module. After receiving all the data matrixes of the distributed application, performing comprehensive state monitoring at regular time, comparing the data in the data matrix with a corresponding alarm threshold set in the man-machine interaction module, and if the data is larger than the set alarm threshold, clearing the data of the data matrix and waiting for the arrival of the next timer period. If the data is smaller than the set alarm threshold, the application is considered to be in an abnormal running state, namely, the comprehensive state monitoring equipment transmits corresponding alarm information to the communication module and the man-machine interaction interface. And performing fault processing on the alarm according to the set alarm outlet. The action module checks whether there is action information transmitted from the integrated status monitoring module.
As a preferred embodiment of the present invention, the man-machine interaction module further comprises an input device and a display device, wherein the input device is used for inputting instructions, and the output device is used for displaying and/or outputting information; the output equipment displays the output information and the alarm information, so that error contents and symptomatic error correction are convenient to observe, and timeliness of solving the problem is improved.
As a preferred embodiment of the invention, the comprehensive monitoring module comprises a timer module and a core calculation module, wherein the timer module is used for checking information at regular time, if the information runs normally, the timer module continues to run and waits for the cycle of the next timer period, if the equipment is abnormal, the alarm information is transmitted to an operator through a corresponding man-machine interaction interface, and the action module is informed to execute corresponding processing actions; and the core calculation module is used for carrying out statistical analysis on the data.
As a preferred embodiment of the present invention, the communication module includes a 485 communication module and a general input output module; 485 communication module is used for receiving and transmitting signals, and general input/output module is used for inputting and outputting information.
As a preferred embodiment of the present invention, the action module includes a watchdog module for timer-generating a task to remove to restart the device or application, and an actuator module for powering down the power module.
As a preferred embodiment of the invention, the function additional module comprises an audible and visual alarm module and a cloud recording module, wherein the audible and visual alarm module is used for sending out audible and visual alarm signals, and the cloud recording module is used for recording data and carrying out network transmission.
The embodiment of the invention also provides a power distribution detection method, which is applied to the power distribution detection device and comprises the following steps:
selecting an installation mode;
setting parameters of a monitoring system;
interfacing with an automation device;
collecting the state of equipment;
monitoring the comprehensive state;
the action module performs a corresponding action. The method can realize the data acquisition of the running state of the equipment under the power system, can avoid the power system fault caused by the dead application software, and can reduce the working complexity of operators in the power industry.
As a preferred embodiment of the invention, the selection of the installation mode, the system is selectable by two installation modes; 1. and (3) physical wiring installation: the system is self-formed into a device, the corresponding communication interface of the automation device of the application scene is connected into the system, and the corresponding action module is also connected into the system device. 2. And (3) system transplanting and installing: the system is a portable library file program, and a manufacturer developing the automation equipment can be transplanted into corresponding equipment on own side to realize embedding the system into the automation equipment so as to realize monitoring of the power supply module.
As a preferred embodiment of the present invention, parameter tuning of the monitoring system is performed, and the parameter tuning of the monitoring system is performed by using the man-machine interaction module, and the main tuning values are as follows: the number of connected devices, the number of distributed applications corresponding to each device, and the alarm threshold and alarm outlet of each distributed application.
As a preferred embodiment of the present invention, the system needs to interface with the automation device in the actual application site and interact information, and if the method is a method of installing physical wiring, the communication line of the automation device needs to be connected to the communication module of the state monitoring system, or the opening amount of the automation device is used to be connected to the communication module of the monitoring system, so as to report the state of the corresponding distributed application by the automation device. If the system is transplanted and installed, the system is needed to be embedded into corresponding automation equipment, a count value is added into corresponding distributed application, namely each application runs once, and the count value is added by 1.
As a preferred embodiment of the present invention, device status collection, data collection is performed on the accessed automation device, and the running status and running data of all physical devices forming the distributed reference, such as the cluster device connectivity status, the CPU of the device, the memory, and the use condition of disk resources, are obtained. If the method is a physical wiring installation method, information uploading instructions are sent to the automation equipment at regular time, all the automation equipment states are polled, and the states corresponding to all the equipment are stored in a data matrix of the equipment state for the comprehensive monitoring module to use, so that the data acquisition of the accessed equipment is realized. If the system is transplanted, the data in the data matrix corresponding to the distributed application is added one by creating a one-dimensional data matrix with the length of the matrix which is the number of the distributed application, and the corresponding distributed application is operated once. And transmitting the data matrix to the integrated monitoring module.
As a preferred embodiment of the invention, the comprehensive state is monitored, after the data matrix of all distributed applications is received, the comprehensive state monitoring is executed at regular time, the data in the data matrix is compared with the corresponding alarm threshold value set in the man-machine interaction module, if the data is larger than the set alarm threshold value, the data of the data matrix is cleared, and the arrival of the next timer period is waited. If the data is smaller than the set alarm threshold, the application is considered to be in an abnormal running state, namely, the comprehensive state monitoring equipment transmits corresponding alarm information to the communication module and the man-machine interaction interface. And performing fault processing on the alarm according to the set alarm outlet.
As a preferred embodiment of the present invention, the action module checks whether there is action information transmitted from the integrated status monitoring module. The action information comprises an executing mechanism power-off instruction and a watchdog instruction, if the executing mechanism power-off action is received, the alarm is considered to be a serious alarm, the power-off operation is executed, and the audible and visual alarm module of the function additional module alarms. And if the software watchdog instruction is received, a watchdog starting mechanism for the application is realized, namely, the watchdog timer is removed, so that the task of restarting the equipment or the application is realized.
As a preferred embodiment of the invention, the human-computer interaction module adopts a form of a human-computer interaction interface of a system related to the touch capacitive screen, the core calculation module adopted by the comprehensive monitoring module is an STM32F429IGT6 singlechip, and the timer module belongs to a module attached to the singlechip. The communication module adopts RS485 bus communication. The action module adopts a vacuum breaker and a chip of a watchdog module of other automatic equipment. The additional function module adopts an audible and visual alarm system. The power module is a 10kV distribution room of a market.
In this example, by adopting a physical connection manner, an operator sets six distributed applications in three devices through a man-machine interaction interface carried on the touch capacitive screen, and sets their alarm thresholds respectively. The three automation devices to be monitored are communication modules, namely RS485 transceiver modules, which are respectively connected to the system through RS485 buses. In the monitoring system, polling information is carried out every 10s, information of automation equipment to be monitored in the power distribution room is respectively queried, all the information is sorted after the information is obtained, and a data matrix with the length of 6 corresponds to six monitored distributed applications. And the physical equipment information supported by the applications is also consolidated and summarized, namely the utilization rate of the CPU, the utilization rate of the memory and the utilization rate of the disk. After finishing the arrangement, the data matrix and the arranged information are sent to the comprehensive monitoring module for judgment.
The comprehensive monitoring module receives the state information matrix and the physical information of the equipment and respectively compares the state information matrix and the physical information with a set threshold value, if the state information matrix and the physical information are larger than the threshold value, the application is considered to run normally, if the state information matrix and the physical information are smaller than the threshold value, a set action instruction is sent to the action module, in the example, the monitored application No. 2 is abnormal, the set action module is used for triggering the action of the watchdog module of the equipment, the state monitoring system stops outputting a clear 0 signal to the hardware watchdog module of the equipment, and the timer of the watchdog overflows so as to restart the related application of the equipment. If the application is still in fault after multiple starting, corresponding alarm information such as audible and visual alarm and power-off of the executing mechanism is triggered.
The above embodiment of the present invention provides a power distribution detecting device, and provides a power distribution detecting method based on the power distribution detecting device, in which whether there is motion information transmitted from the integrated status monitoring module is checked by the motion module. The action module performs a corresponding action. The method can realize the data acquisition of the running state of the equipment under the power system, can avoid the power system fault caused by the dead application software, and can reduce the working complexity of operators in the power industry.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (3)
1. An electric power distribution detection apparatus, characterized by comprising:
the man-machine interaction module is used for parameter setting;
the comprehensive monitoring module collects and gathers information and performs fault judgment and operation on the obtained information;
the communication module is used for transmitting information to the outside;
the action module is connected with the man-machine interaction module, the comprehensive monitoring module and the communication module and used for controlling, switching on and off, alarming and resetting data;
a power module for providing operating energy;
the function additional module comprises an audible and visual alarm module and a cloud recording module, wherein the audible and visual alarm module is used for sending out audible and visual alarm signals, the cloud recording module is used for recording data and carrying out network transmission, the comprehensive monitoring module comprises a timer module and a core calculation module, the timer module is used for checking information at regular time, transmitting alarm information and notifying the action module to execute corresponding processing actions; the core calculation module is used for carrying out statistical analysis on the data, and the power distribution detection method of the power distribution detection device comprises the following steps:
selecting an installation mode;
setting parameters of a monitoring system;
docking with the device;
collecting the state of equipment;
monitoring the comprehensive state;
the action module executes output information and alarm, the selection of the installation mode comprises physical wiring installation and system transplanting installation, the parameter setting value comprises the number of connected devices, the distributed application number corresponding to each device, the alarm threshold value and the alarm outlet of each distributed application, and the device is in butt joint with the action module; if the system is transplanted and installed, the system is required to be embedded into corresponding automation equipment, a count value is added into corresponding distributed applications, namely each application is operated once, the count value is added with 1, the equipment state is acquired, data acquisition is carried out on the accessed equipment, the operation states and operation data of all physical equipment forming distributed reference are acquired, if the physical wiring is installed, information uploading instructions are sent to the automation equipment at regular time, all equipment states are polled, and the states corresponding to all equipment are stored in a data matrix of one equipment state; if the system is transplanted, a one-dimensional data matrix with the number of the distributed applications as the length of the matrix is created, and the data in the data matrix corresponding to the application is added one for each running of the corresponding distributed application, so that comprehensive state monitoring is performed at regular time, the data in the data matrix is compared with a corresponding alarm threshold value set in a man-machine interaction module, if the data is larger than the set alarm threshold value, the data of the data matrix is cleared, and the arrival of the next timer period is waited; if the data is smaller than the set alarm threshold, the application is considered to be in an abnormal running state, namely, the comprehensive state monitoring equipment transmits corresponding alarm information to the communication module and the man-machine interaction interface.
2. The power distribution detection apparatus according to claim 1, wherein the communication module includes a 485 communication module and a general purpose input output module; 485 communication module is used for receiving and transmitting signals, and general input/output module is used for inputting and outputting information.
3. A power distribution detection apparatus according to claim 1, wherein the action module comprises a watchdog module for timer-generating removal to effect a task of restarting the device or application, and an actuator module for power-off operation of the power supply module.
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| CN101785675A (en) * | 2010-03-04 | 2010-07-28 | 重庆理工大学 | Movement monitoring device and monitoring method thereof |
| CN101963797A (en) * | 2010-04-16 | 2011-02-02 | 中国矿业大学 | Embedded system based intrinsic safety type coal mining machine state monitoring and analyzing device |
| CN107276226A (en) * | 2017-07-05 | 2017-10-20 | 合肥思博特软件开发有限公司 | The electric power monitoring system that a kind of metro safety is powered |
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