JP3229238U - DC switch box and its monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a DC switch box capable of timely intelligentization, monitoring and protection, and guaranteeing the safety of personnel and property. A DC switch box includes a positive electrode box 11, a negative electrode box 12, a breaker 13, and an insulating switch 14. The first end of the breaker is connected to the busbar of the positive electrode box, the second end of the breaker is connected to the first end of the insulation switch, and the breaker is connected to the busbar of the positive electrode box and the positive electrode box when the DC switch box fails. Block the connection. Further, the second end of the insulation switch is connected to the overhead wire 15, and the insulation switch cuts off and conducts the voltage signal between the DC switch box and the overhead wire. [Selection diagram] Fig. 2

Description

This embodiment relates to the technical field of electronic circuits, for example, to a DC switch box, its monitoring system and monitoring method.

In related technology, the DC towing power supply system is an important component of the track traffic towing equipment, and the DC switch device is the core of the DC towing power supply equipment. Usually, the DC switch device mainly includes a DC switch box, a DC breaker, a DC microcomputer comprehensive measurement control protection device, and an insulation switch. With the rapid development of track traffic in Japan, the development of China's self-designed track traffic DC switch device is desired.

The main function of the switch box of a DC switch device is the opening and closing of the power system during power generation, transmission, distribution and electrical energy conversion, controlling and protecting electrical equipment, mainly breakers, isolating switches, loads. It consists of a switch, an operating mechanism, a transformer, and a plurality of protective devices. The DC breaker ensures the safe operation of the DC power supply system and requires the DC breaker mechanism to operate at high speed, and its main function is to protect the on / off of the primary current of the power supply of the positive electrode circuit of the DC traction power supply system. That is. The DC microcomputer comprehensive measurement control protection device is a DC control and protection relay that employs multiple powerful microprocessors to realize measurement, protection and control functions, and can be applied to trains, urban track traffic, etc. Satisfy the measurement control requirements of the breaker.

However, the DC switch box and its monitoring system in the related technology are not sufficient for intelligence and cannot be controlled in a timely manner, so they are not applied to the increasingly intelligent track traffic control system.

In view of this, in this embodiment, the DC switch box and its monitoring system and monitoring solve the technical problem that the DC switch box and its monitoring system are not sufficient for intelligence in the related technology and the DC switch box cannot be controlled in a timely manner. Provide a method.

The DC switch box includes a positive electrode box, a negative electrode box, a breaker, and an insulated switch.
The first end of the breaker was configured to be connected to the busbar of the positive electrode box, the second end of the breaker was connected to the first end of the insulating switch, and the breaker had the DC switch box failed. At that time, it is configured to cut off the connection between the positive electrode box and the bus bar of the positive electrode box.
The second end of the insulation switch is connected to an overhead wire, and the insulation switch is configured to cut off and conduct a voltage signal between the DC switch box and the overhead wire.

Preferably, the breaker is a DC breaker.

The DC switch box monitoring system is used to monitor the DC switch box according to any one of the above, and the monitoring system includes a signal collecting device, a server, a communication device, and a processor.
The first input end of the signal collecting device is connected to the bus bar of the positive electrode box of the DC switch box and is configured to collect the signal of the bus bar of the positive electrode box, and the second input end of the signal collecting device is It is connected to the bus bar of the negative electrode box of the DC switch box and is configured to collect the signal of the bus bar of the negative electrode box, and the third input end of the signal collecting device is attached to the second end of the breaker of the DC switch box. Connected and configured to collect electrical signals output from breakers in protective devices,
The input end of the communication device is connected to the output end of the signal collection device, the first transmission end of the communication device is connected to the server, and the second transmission end of the communication device is connected to the control end of the processor. Connected, the communication device is configured to transmit a signal collected by the signal collection device to the server, and transmits communication between the server and the processor.
The server is configured to match the collected signals by the signal collecting device so as to construct a database, monitor the collected signals by the signal collecting device in real time, and transmit the signal to the processor by the communication device.
The output end of the processor is connected to the control end of the DC switch box, and the processor is configured to perform a protective operation on the DC switch box based on a signal transmitted by the server.

Preferably, a shunt is further provided.
The first end of the shunt is connected to the second end of the breaker of the DC switch box, the second end of the shunt is connected to the first end of the insulated switch of the DC switch box, and the shunt is The signal output from the breaker is limited, and the signal collecting device is configured to collect the limited electrical signal.

Preferably, the shunt comprises a current sensing end and a voltage sensing end, and a third input end of the signal collecting device comprises a current collecting end and a voltage collecting end.
The current collecting end of the signal collecting device is connected to the current detecting end of the shunt and is configured to detect the current of the current detecting end, and the voltage collecting end is connected to the voltage detecting end of the shunt. , It is configured to detect the voltage at the voltage detection end.

Preferably, the signal collector comprises an optical fiber isolated amplifier.

Preferably, a master machine is further provided.
The master machine is connected to the server via the communication device, stores and displays the database constructed by the server and the real-time monitoring data of the signal collection device, receives an external control command, and receives the communication device. Is configured to send to the server
The server is further configured to transmit a signal to the processor by the communication device in response to the external control command.

The monitoring method of the DC switch box is executed by the monitoring system of the DC switch box according to any one of the above.
Acquiring all recorded waveform data of electrical signals in the DC switch box and constructing a database,
It includes determining the operating parameters of the DC switch box based on the collected signals obtained by detecting the electrical signals of the database and the DC switch box in real time.

Preferably, the database is used to detect the electrical signal of the DC switch box in real time and determine the operating parameters of the DC switch box.
To set and calculate the electrical signals stored in the database and analyze the operating status of the DC switch box.
It includes tracking the current change of the DC switch box in real time according to the operating condition and determining the operating parameter of the DC switch box.

Preferably, it is possible to set and calculate the electrical signals stored in the database.
Based on all the recorded waveform data in the database, the current change tendency of the DC switch box is analyzed to determine the parameter value of the setting calculation.
The setting calculation is performed based on the parameter value of the setting calculation and the electric signal stored in the database.

Preferably, after determining the operating parameters of the DC switch box,
It further includes performing a quality evaluation on the DC switch box based on the database and the operating parameters.

Preferably, performing a quality evaluation on the DC switch box based on the database and the operating parameters
To construct a data graphic by extracting DC components and harmonic components from the data in the database.
Determining the power distribution status of the DC switch box in a plurality of operating states based on the data graphic and operating parameters in a plurality of operating states.
It includes acquiring the operation pattern of the DC switch box and determining the operation parameters of the DC switch box based on the power distribution status.

Preferably, all recorded waveform data of the electric signal in the DC switch box is periodically collected, and further includes updating the data information stored in the database.

Preferably, based on the database and the operating parameters, before performing a quality evaluation on the DC switch box,
Acquiring the number of breaks / trips and basic parameters of the breaker in the DC switch box
It further includes setting maintenance criteria for the DC switch box based on the breaker break / trip count and basic parameters.

Preferably, performing a quality evaluation on the DC switch box based on the database and the operating parameters
To analyze the failure rate and failure interval time of the DC switch box in real time based on the database and the operation parameters.
It includes evaluating the quality of the DC switch box based on the maintenance criteria, failure rate and time between failures of the DC switch box.

The DC switch box, its monitoring system, and the monitoring method according to this embodiment solve the technical problem that the control and monitoring of the DC switch box of the related technology is not timely and is not sufficient for intelligence. In this embodiment, a monitoring system is adopted to monitor the operating status of the DC switch box so as to cut off the connection between the DC switch box and the bus bar / power supply equipment in the event of a failure, and a breaker and an insulation switch are installed in the DC switch box. By installing it, the DC switch box can be timely intelligent, monitored and protected, and the safety of personnel and property can be guaranteed.

It is a structural schematic diagram of the DC switch box which concerns on Example 1. FIG. It is a structural schematic diagram of the DC switch box which concerns on Example 2. FIG. It is a structural schematic diagram of the monitoring system of the DC switch box which concerns on Example 3. FIG. It is a flowchart of the monitoring method of the DC switch box which concerns on Example 4. FIG. It is a flowchart of the monitoring method of the DC switch box which concerns on Example 5. FIG. It is a flowchart of the monitoring method of the DC switch box which concerns on Example 6. It is a flowchart of the monitoring method of the DC switch box which concerns on Example 7. FIG.

Example 1
The DC switch box according to this embodiment can be applied to a usage scene of an orbital traffic power supply system. FIG. 1 is a schematic structural diagram of a DC switch box according to the first embodiment. As shown in FIG. 1, the DC switch box 10 according to this embodiment includes a positive electrode box 11, a negative electrode box 12, a breaker 13, and an insulating switch 14. Here, the first end of the breaker 13 is connected to the bus bar DC + of the positive electrode box 11, the second end of the breaker 13 is connected to the first end of the insulation switch 14, and the breaker 13 is connected to the first end of the insulation switch 14 when the electric circuit fails. It is used to cut off the connection between the positive electrode box 11 and its bus bar DC +. The second end of the insulation switch 14 is connected to the overhead line 15 and is used to cut off the voltage signal between the DC switch box and the overhead line 15.

Illustratively, in a track traffic power supply system in a related technology, the AC high voltage value of the main substation of a towing substation is stepped down by a rectifying element, rectified to a DC voltage of 1500 V, and supplied to an overhead line by a DC switch box. .. However, during actual use, failures such as short circuits can occur in the electric circuit, which is disadvantageous for the operation of track traffic. Therefore, when a failure occurs, the corresponding protection device can protect against track traffic. Need to be installed. As shown in FIG. 1, the box of the DC switch box 10 according to the present embodiment includes a positive electrode box 11 and a negative electrode box 12, and may be further provided with another feeder line box, a shunt trip box, and the like. .. The corresponding DC switch box 10 further comprises a breaker 13 and an insulating switch 13. The breaker 13 cuts off the connection between the positive electrode box 11 and the bus bar DC + of the positive electrode box 11 when the DC switch box 10 fails so as to ensure that the positive electrode box and the corresponding device are not damaged by the short-circuit current. be able to. Further, the insulation switch 14 connected in series with the breaker 13 electrically separates the DC switch box 10 from the overhead line 15. Here, the AC high voltage value may be 2400V or 3600V.

Preferably, the breaker 13 of the DC switch box 10 according to the present embodiment may be a DC breaker. Since the DC breaker has a high breaking capacity and limiting characteristics, it can be ensured that the breaker 13 is not damaged under the condition of a short circuit current, and the safe distance can be shortened based on the high breaking capacity.

The DC switch box according to this embodiment controls the connection between the positive electrode box and the bus bar by a breaker, and adopts an insulation switch to cut off the DC switch box and the electrical equipment in the overhead line when a failure occurs. In addition, the connection between the DC switch box and the bus or overhead line will be promptly cut off to ensure the safety of personnel and property.

Example 2
The DC switch box monitoring system according to this embodiment is applied to a usage scene for monitoring the operating status of the DC switch box in the track traffic power supply system. FIG. 2 is a schematic structural diagram of the DC switch box according to the second embodiment. The DC switch box monitoring system according to this embodiment is applied to the DC switch box according to this embodiment. As shown in FIG. 2, the monitoring system includes a signal collecting device 20, a server 30, a communication device 40, and a processor 50.

Here, in the signal collecting device 20, the first input end is connected to the bus bar of the positive electrode box 11 of the DC switch box 10, the second input end is connected to the bus bar of the negative electrode box 12 of the DC switch box 10, and the third input. The end is connected to the second end of the breaker 13 of the DC switch box 10 and is used to collect the signal of the bus bar of the positive electrode box 11, the signal of the bus bar of the negative electrode box 12, and the electric signal of the breaker 13 output. The input end of the communication device 40 is connected to the output end of the signal collection device 20, the first transmission end of the communication device 40 is connected to the server 30, and the second transmission end of the communication device 40 is connected to the control end of the processor 50. The communication device 40 is used to transmit the signal collected by the signal collecting device 20 to the server 30 and transmit the communication between the server 30 and the processor 50. The server 30 matches the signals collected by the signal collecting device 20 as if constructing a database, monitors the signals collected by the signal collecting device 20 in real time, and transmits the signals to the processor 50 by the communication device 40. Used. The output end of the processor 50 is connected to the control end of the DC switch box 10 and is used to perform a protective operation on the DC switch box 10 based on the signal transmitted by the server 30.

Illustratively, in an orbital traffic power supply system, the DC switch box is the core of the power supply equipment. While using the power supply system for orbital traffic, the failure probability of the DC1500V DC system is uncertain due to uncertain factors such as bad environment and deterioration of equipment. Common types of failure include overhead line overload, transmitter failure, rectifier room and high voltage room alarms, and the like. Therefore, it is necessary for the parties concerned to always pay attention to changes in parameters such as temperature and humidity of the equipment, report any abnormalities in a timely manner, analyze the failure type by the parties concerned, and then carry out the inspection. In this way, the method in which a person performs a patrol inspection to detect and analyze a failure is not sufficient for intelligence and the manpower is limited, so that the failure cannot be detected in a timely manner, and the personnel and property Highly likely to cause loss.
As shown in FIG. 2, in this embodiment, the signal collecting device 20 collects the signal of the bus bar of the positive electrode box 11, the signal of the bus bar of the negative electrode box 12, and the electric signal output from the output end of the breaker 13, respectively, and collects electricity. By uploading the signal to the server 30 by the communication device 40, the server 30 matches the signal collected by the signal collecting device 20, constructs a corresponding database, monitors the collected signal in real time, and performs a DC switch box. Provided is a monitoring system of a DC switch device that realizes all recorded waveforms for the operating conditions of track traffic related to 10 and the overhead line 15. Further, the communication device 40 further transmits communication between the server 30 and the processor 50, and the corresponding control is performed based on the database constructed by the processor 50 in the server 30 and the real-time signal collected by the signal collection device 20. Signals can be transmitted to implement protective measures on the relevant orbital traffic equipment on the DC switch box 10 and overhead line 15.

The DC switch box monitoring system according to this embodiment detects the operating status of the DC switch box and overhead line in the entire process, constructs a corresponding database, and monitors the operating status of the DC switch box and overhead line in real time. As a result, the current failure status can be determined in a timely manner, the DC switch box and the overhead line can be intelligently monitored, and the safety of personnel and property can be ensured.

Example 3
The present embodiment provides optimization based on the above embodiment, and employs a shunt based on the above embodiment to detect an electric signal output from a breaker output end in a DC switch box. FIG. 3 is a schematic structural diagram of the DC switch box monitoring system according to the third embodiment. As shown in FIG. 3, the monitoring system according to the present embodiment includes a signal collecting device 20, a server 30, a communication device 40, a processor 50, and a shunt 60. Here, the first end of the current divider 60 is connected to the second end of the breaker 13 of the DC switch box 10, and the second end is connected to the first end of the insulation switch 14 of the DC switch box 10 from the breaker 13. It is used to limit the output signal and make the electrical signal collected by the signal collector 20 more accurate.

Preferably, the shunt 60 comprises a current sensing end and a voltage sensing end, and correspondingly, the third input end of the signal collector 20 may include a current collecting end and a voltage collecting end. Here, the current collecting end of the signal collecting device 20 is connected to the current detecting end of the diversion device 60, the voltage collecting end of the signal collecting device 20 is connected to the voltage detecting end of the diversion device 60, and the current detecting end of the diversion device 60. It is used to detect the current and the voltage at the voltage detection end, respectively.

Illustratively, in an orbital traffic power supply system, it is necessary to employ a reliable measuring system that measures the current signal flowing through the DC switch box to ensure that the high voltage DC switch box has reliable adjustment and protection functions. There is. The shunt can measure the current value flowing through the shunt by connecting the DC shunt in series in a high-voltage DC circuit as an accurate resistance capable of passing a large current. The signal collecting device 20 in the monitoring system according to the present embodiment realizes that the electric signal output from the output end of the breaker 13 is accurately collected based on the voltage and current values at both ends of the collecting shunt 60.

Preferably, the signal collector 20 comprises an optical fiber isolated amplifier. The electrical signal collected by the signal collector 20 by the shunt can be converted into a numerical signal, transmitted via an optical fiber, and electrically isolated. In the signal collecting device 20, an optical fiber isolated amplifier can be adopted to transmit a signal to have higher measurement accuracy and measurement range.

Preferably, as shown in FIG. 3, based on the above embodiment, the DC switch box monitoring system according to the present embodiment further includes a master machine 70. Here, the master machine 70 is connected to the server 30 via the communication device 40, stores and displays the database constructed by the server 30 and the real-time monitoring data of the signal collection device 20, receives an external control command, and communicates. It is used for transmission to the server 30 by the device 40. The server 30 is further used to transmit a signal to the processor 50 by the communication device 40 in response to an external control command.

Illustratively, a master machine 70 is installed in a DC switch box monitoring system, and communication with the server 30 is realized by a communication device 40, whereby the master machine 70 intuitively displays matching data in the server. It is possible to store the electric signal and receive the electric signal collected in real time by the signal collecting device 20. At the same time, the engineer predicts the possibility of failure by observing the data displayed on the master machine 70, and inputs the control command related to the master machine 70 to transmit the control command to the communication device 40. Can be transmitted to the processor 50, whereby the processor 50 controls the DC switch box 10 to perform a protective operation.

In the DC switch box monitoring system according to the present embodiment, by installing a shunt, the signal collector collects the electric signal limited to the shunt current after outputting from the breaker, and the signal collector collects the electric signal. The resulting electrical signal is made more accurate, and more accurate monitoring of the operating status of the DC switch box is realized.

Example 4
This embodiment provides a monitoring method for a DC switch box. The monitoring method is applied to the usage scene of all recorded waveforms of the operating status of the DC switch box. The method is applied to monitoring a DC switch box according to the present embodiment and is performed on the monitoring system according to the present embodiment. FIG. 4 is a flowchart of a DC switch box monitoring method according to the fourth embodiment. As shown in FIG. 4, the monitoring method according to this embodiment includes S410 to S420.

In S410, all recorded waveform data of the electric signal in the DC switch box is acquired, and a database is constructed.

Illustratively, a DC switch box may be a metal closed plant with a nominal operating voltage of generally DC 1500 V or less, mounted inside a door, and air-insulated, divided into a plurality of functional chambers. May be good. For example, the DC switch box described in this embodiment may be divided into a positive electrode box, a negative electrode box, a hand card chamber of a breaker, and the like. The main function of the DC switch box is used in the DC traction power supply system, which distributes DC electrical energy and supplies power to overhead lines or power supply rails. While using the DC switch box, various types of failures may occur due to the operating environment or human operation, so it is necessary to monitor the DC switch box in real time. Since the failure status differs depending on the DC switch box, it is necessary to first collect the electrical signals transmitted in the DC switch box, acquire all the recorded waveform data of the electrical signals of the DC switch box, and build the corresponding database. , Acquire the failure monitoring standard of the DC switch box.
In S420, the electric signal of the DC switch box is detected in real time while using the database, and the operating parameters of the DC switch box are determined.

Illustratively, by constructing a database of a DC switch box, the monitoring standard of the DC switch box, that is, the change status of the electric signal at the failure point of the DC switch box is acquired, and the DC switch box is in operation. By collecting the electrical signals in real time, it is possible to compare with the information stored in the database and grasp the actual operating parameters of the DC switch box, that is, the situation of the failure that may occur. Here, the state of failure that may occur may be the failure probability of the DC switch box, the degree of risk of failure, or the like.

The method for monitoring the DC switch box according to this embodiment is to record the electric signal in the DC switch box in the entire process, construct a corresponding database, and detect the operating status of the DC switch box in real time based on the database. This makes it possible to intelligently monitor the DC switch box in a timely manner and ensure the safety of personnel and property when the DC switch box operates. In this embodiment, the DC switch box monitoring method further includes S430.

In S430, quality evaluation is performed on the DC switch box based on the database and the operating parameters.

Illustratively, by acquiring a database of the DC switch box based on all recorded waveform data of the electric signals of the DC switch box, it is possible to grasp the change status of the electric signals at a plurality of failure points in the DC switch box. Can be done. Then, after comparing the electric signal when the DC switch box actually operates with the information stored in the database, the DC switch box actually operates by acquiring the actual operating parameters of the DC switch box. At that time, the probability of failure and the degree of danger can be obtained. Therefore, the superiority or inferiority quality of the DC switch box can be evaluated.

Preferably, based on the above embodiment, the monitoring method further comprises periodically collecting all recorded waveform data of electrical signals in the DC switch box and updating the data information stored in the database.

Illustratively, while the DC switch box is actually operating, there is a difference between the specific operation information of the DC switch box and the reference operation information due to the influence of the operating environment and human operation, and the failure occurs. Since the points change correspondingly, it is necessary to update the information stored in the database in real time. After collecting all recorded waveform data of electrical signals in real time while the DC switch box is actually operating, it is possible to update the information stored in the database in real time by realigning the information in the data. To do.

Example 5
The present embodiment provides a method of optimizing based on the above embodiment and determining the operating parameters of the DC switch box after detecting the electric signal of the DC switch box in real time. FIG. 5 is a flowchart of a DC switch box monitoring method according to the fifth embodiment. As shown in FIG. 5, the method for monitoring the DC switch box according to the present embodiment includes S501 to S504.

In S501, all recorded waveform data of the electric signal in the DC switch box is acquired, and a database is constructed.

In S502, the electric signal stored in the database is set and calculated, and the operating state of the DC switch box is analyzed. The operating state is a theoretical operating state.

Illustratively, the change tendency of the path current in the DC switch box can be grasped from the accumulation and statistics of all recorded waveform data of the DC switch box and big data for a long time, whereby the DC switch box is applied. The current pattern when the locomotive is started is acquired from the different operating states of the track traffic and the different operating diagrams, and the operation change is set and calculated, and the relay operating status of the rail traction power supply system, that is, the operation of the DC switch box. Understand the situation. Here, in the method of setting and calculating the electric signal stored in the database, the current change tendency of the DC switch box is analyzed by all the recorded waveform data in the database, the parameter value of the setting calculation is determined, and the setting is performed. It may be a method of setting calculation based on the calculation parameter value and the electric signal stored in the database.

In S503, the current change of the DC switch box is tracked in real time according to the operating condition, and the operating parameters of the DC switch box are determined.

Illustratively, the operating status of the DC switch box acquired after setting and calculating the data information stored in the database is the theoretical operating status of the DC switch box, which is the actual operating parameter of the DC switch box. Provide a rationale for the decision. Therefore, by monitoring the DC feed current in real time in the DC switch box, the current change in a special period, for example, the boundary condition of protection activation can be tracked back and forth, a detailed current curve can be obtained, and protection and operation failure can be obtained. Accurately analyze the cause of malfunction or operation and determine the actual operating parameters of the DC switch box.

In S504, quality evaluation is performed on the DC switch box based on the database and the operation parameters.

The monitoring method of the DC switch box according to the present embodiment sets and calculates the data information stored in the database constructed by recording the data in the entire process of the DC switch box, and sets and calculates the theoretical operating state of the DC switch box. By acquiring the data and determining the operating parameters of the DC switch box according to the actual current change tendency, the protection operation in the DC switch box is accurately analyzed, and the DC switch box is intelligently monitored in a timely manner. Achieve what you do.

Example 6
This embodiment is modified based on the above embodiment to provide a method for quality evaluation of a DC switch box. FIG. 6 is a flowchart of a DC switch box monitoring method according to the sixth embodiment. As shown in FIG. 6, the method for monitoring the DC switch box according to the present embodiment includes S601 to S606.

In S601, all recorded waveform data of the electric signal in the DC switch box is acquired, and a database is constructed.

In S602, the electric signal of the DC switch box is detected in real time by the database, and the operating parameters of the DC switch box are determined.

In S603, a DC component and a harmonic component are extracted from the data in the database, and a data graphic is constructed.

Illustratively, in an orbital traffic power supply system, an AC electrical signal is usually rectified, a corresponding DC voltage is obtained and distributed by a DC switch box. The large-capacity non-linear load of the rectification technique consumes a large amount of reactive power and thus generates a harmonic current. The complexity of the harmonic and DC components in the feeding system poses some risk to the feeding system. In a database constructed from all recorded waveform data of DC switch box electrical signals, the DC and harmonic components of the DC switch box electrical signals influence the determination of DC switch box operating parameters. Therefore, after extracting the DC component and the harmonic component, the corresponding numerical diagram may be constructed. The data graphic may be a combination of data reporting and a histogram, pie chart, etc. for intuitive display and judgment.

In S604, the power distribution status of the DC switch box in the plurality of operating states is determined based on the data graphic and the operating parameters in the plurality of operating states.

In S605, the operation pattern of the DC switch box is acquired based on the power distribution status, and the operation parameters of the DC switch box are determined.

Illustratively, after extracting DC components and harmonic components from the data information stored in the database, the corresponding data graphics are constructed, and the operating states of the track traffic controlled by the DC switch box for multiple periods. And, according to the operating environment, a power distribution comparison table is formed for a corresponding period, the influence tendency of the power distribution and the operating status in a plurality of operating states of the DC switch box is acquired, and the corresponding operating pattern is acquired. The operating parameters of the DC switch box can be determined by the operating pattern.

In S606, the quality of the DC switch box is evaluated based on the database and the operating parameters.

In the DC switch box monitoring method according to this embodiment, after extracting the DC component and harmonic component in the database constructed by recording the electric signal of the DC switch box in the entire process, the corresponding data graphic is displayed. It is constructed, the power distribution status of the DC switch box is acquired according to the operating parameters of the DC switch box in a plurality of operating states, and the operating parameters of the DC switch box are determined. Further, the quality of the DC switch box is evaluated, and the DC switch box can be intelligently monitored in a timely manner.

Example 7
The present embodiment is modified based on the technique of the above embodiment to provide a method of monitoring a DC switch box and a method of setting a maintenance standard for the DC switch box. The method of evaluating the quality of the DC switch box based on the database and the operation parameters is to acquire the breakage / trip count and basic parameters of the breaker of the protection device in the DC switch box, and to obtain the basic parameters of the breaker. Includes setting maintenance criteria for the DC switch box based on the number of disconnections / trips and basic parameters. FIG. 7 is a flowchart of a DC switch box monitoring method according to the seventh embodiment. As shown in FIG. 7, the method for monitoring the DC switch box according to this embodiment includes S701 to S704.

In S701, all recorded waveform data of the electric signal in the DC switch box is acquired, and a database is constructed.

In S702, the electric signal of the DC switch box is detected in real time by the database, and the operating parameters of the DC switch box are determined. In S703, the breaker disconnection / trip count and the basic parameters in the DC switch box are acquired.

Illustratively, a breaker in a DC switch box may break the connection between the positive electrode box in the DC switch box and the busbar of the DC switch box in the event of a failure to ensure that the positive electrode box and corresponding equipment are not damaged. it can. The breaker's breaking ability and the quality of the limiting characteristics are important characteristics for evaluating the speed of operation of the breaker under the condition of short-circuit current. However, during actual operation, the breaker in the DC switch box disconnects / trips depending on the current conditions under the actual operating conditions. Therefore, when further monitoring the DC switch box, the basic parameters of the breaker and the actual disconnection occur. / Need to be tied to the trip situation.

In S704, the maintenance standard of the DC switch box is set according to the number of breaks / trips of the breaker and the basic parameters.

Illustratively, by monitoring the actual break / trip situation of the breaker, it is possible to grasp the current node in the circuit of the break / trip during the actual operation of the breaker, and the basic operation parameters of the breaker. According to this, the status of disconnection / trip in the breaker is classified and statistic, the status of the DC current when the DC switch box performs the protection operation is acquired, and the maintenance standard corresponding to the DC switch box is set. Maintenance can be performed automatically when the DC switch box is the same or similar.

The method for monitoring the DC switch box according to this embodiment sets maintenance standards for the DC switch box based on the number of breaks / trips of the breaker in the DC switch box and the basic operation parameters of the breaker, and in the same or similar cases, A command to maintain the DC switch box is automatically issued, the DC switch box is intelligentized and monitored in a timely manner, and the safety of personnel and property is ensured.

The DC switch box, its monitoring system, and the monitoring method according to this embodiment solve the technical problem that the DC switch box is not sufficient for intelligence in the related technology and cannot be controlled and monitored in a timely manner. In this embodiment, a monitoring system is used to monitor the operating status of the DC switch box, and a breaker and an insulated switch are installed in the DC switch box. When a failure occurs, the DC switch box and bus bar / power supply equipment The connection with the DC switch box can be cut off, and the DC switch box can be intelligently monitored and protected in a timely manner to guarantee the safety of personnel and property.

This embodiment relates to the technical field of electronic circuits, for example, to a DC switch box, its monitoring system and monitoring method.

In related technology, the DC towing power supply system is an important component of the track traffic towing equipment, and the DC switch device is the core of the DC towing power supply equipment. Usually, the DC switch device mainly includes a DC switch box, a DC breaker, a DC microcomputer comprehensive measurement control protection device, and an insulation switch. With the rapid development of track traffic in Japan, the development of China's self-designed track traffic DC switch device is desired.

The main function of the switch box of a DC switch device is the opening and closing of the power system during power generation, transmission, distribution and electrical energy conversion, controlling and protecting electrical equipment, mainly breakers, isolating switches, loads. It consists of a switch, an operating mechanism, a transformer, and a plurality of protective devices. The DC breaker ensures the safe operation of the DC power supply system and requires the DC breaker mechanism to operate at high speed, and its main function is to protect the on / off of the primary current of the power supply of the positive electrode circuit of the DC traction power supply system. That is. The DC microcomputer comprehensive measurement control protection device is a DC control and protection relay that employs multiple powerful microprocessors to realize measurement, protection and control functions, and can be applied to trains, urban track traffic, etc. Satisfy the measurement control requirements of the breaker.

However, the DC switch box and its monitoring system in the related technology are not sufficient for intelligence and cannot be controlled in a timely manner, so they are not applied to the increasingly intelligent track traffic control system.

In view of this, in this embodiment, the DC switch box and its monitoring system and monitoring solve the technical problem that the DC switch box and its monitoring system are not sufficient for intelligence in the related technology and the DC switch box cannot be controlled in a timely manner. Provide a method.

The DC switch box includes a positive electrode box, a negative electrode box, a breaker, and an insulated switch.
The first end of the breaker was configured to be connected to the busbar of the positive electrode box, the second end of the breaker was connected to the first end of the insulating switch, and the breaker had the DC switch box failed. At that time, it is configured to cut off the connection between the positive electrode box and the bus bar of the positive electrode box.
The second end of the insulation switch is connected to an overhead wire, and the insulation switch is configured to cut off and conduct a voltage signal between the DC switch box and the overhead wire.

Preferably, the breaker is a DC breaker.

The DC switch box monitoring system is used to monitor the DC switch box according to any one of the above, and the monitoring system includes a signal acquisition module , a server, a communication module, and a processor.
The first input end of the signal acquisition module is connected to the bus bar of the positive electrode box of the DC switch box and is configured to collect the signal of the bus bar of the positive electrode box, and the second input end of the signal acquisition module is It is connected to the bus bar of the negative electrode box of the DC switch box and is configured to collect the signal of the bus bar of the negative electrode box, and the third input end of the signal collection module is located at the second end of the breaker of the DC switch box. Connected and configured to collect electrical signals output from breakers in protective devices,
The input end of the communication module is connected to the output end of the signal acquisition module , the first transmission end of the communication module is connected to the server, and the second transmission end of the communication module is connected to the control end of the processor. Connected, the communication module is configured to transmit a signal collected by the signal acquisition module to the server, and transmits communication between the server and the processor.
The server is configured to match the signals collected by the signal collection module so as to build a database, monitor the signals collected by the signal collection module in real time, and transmit the signals to the processor by the communication module .
The output end of the processor is connected to the control end of the DC switch box, and the processor is configured to perform a protective operation on the DC switch box based on a signal transmitted by the server.

Preferably, a shunt is further provided.
The first end of the shunt is connected to the second end of the breaker of the DC switch box, the second end of the shunt is connected to the first end of the insulated switch of the DC switch box, and the shunt is The signal output from the breaker is limited, and the signal acquisition module is configured to collect the limited electrical signal.

Preferably, the shunt comprises a current sensing end and a voltage sensing end, and a third input end of the signal acquisition module comprises a current collecting end and a voltage collecting end.
The current collecting end of the signal collecting module is connected to the current detecting end of the shunt and is configured to detect the current of the current detecting end, and the voltage collecting end is connected to the voltage detecting end of the shunt. , It is configured to detect the voltage at the voltage detection end.

Preferably, the signal acquisition module comprises an optical fiber isolated amplifier.

Preferably, a master machine is further provided.
The master machine is connected to the server via the communication module , stores and displays the database constructed by the server and the real-time monitoring data of the signal collection module , receives an external control command, and receives the communication module. Is configured to send to the server
The server is further configured to transmit a signal to the processor by the communication module in response to the external control command.

The monitoring method of the DC switch box is executed by the monitoring system of the DC switch box according to any one of the above.
Acquiring all recorded waveform data of electrical signals in the DC switch box and constructing a database,
It includes determining the operating parameters of the DC switch box based on the collected signals obtained by detecting the electrical signals of the database and the DC switch box in real time.

Preferably, the database is used to detect the electrical signal of the DC switch box in real time and determine the operating parameters of the DC switch box.
To set and calculate the electrical signals stored in the database and analyze the operating status of the DC switch box.
It includes tracking the current change of the DC switch box in real time according to the operating condition and determining the operating parameter of the DC switch box.

Preferably, it is possible to set and calculate the electrical signals stored in the database.
Based on all the recorded waveform data in the database, the current change tendency of the DC switch box is analyzed to determine the parameter value of the setting calculation.
The setting calculation is performed based on the parameter value of the setting calculation and the electric signal stored in the database.

Preferably, after determining the operating parameters of the DC switch box,
It further includes performing a quality evaluation on the DC switch box based on the database and the operating parameters.

Preferably, performing a quality evaluation on the DC switch box based on the database and the operating parameters
To construct a data graphic by extracting DC components and harmonic components from the data in the database.
Determining the power distribution status of the DC switch box in a plurality of operating states based on the data graphic and operating parameters in a plurality of operating states.
It includes acquiring the operation pattern of the DC switch box and determining the operation parameters of the DC switch box based on the power distribution status.

Preferably, all recorded waveform data of the electric signal in the DC switch box is periodically collected, and further includes updating the data information stored in the database.

Preferably, based on the database and the operating parameters, before performing a quality evaluation on the DC switch box,
Acquiring the number of breaks / trips and basic parameters of the breaker in the DC switch box
It further includes setting maintenance criteria for the DC switch box based on the breaker break / trip count and basic parameters.

Preferably, performing a quality evaluation on the DC switch box based on the database and the operating parameters
To analyze the failure rate and failure interval time of the DC switch box in real time based on the database and the operation parameters.
It includes evaluating the quality of the DC switch box based on the maintenance criteria, failure rate and time between failures of the DC switch box.

The DC switch box, its monitoring system, and the monitoring method according to this embodiment solve the technical problem that the control and monitoring of the DC switch box of the related technology is not timely and is not sufficient for intelligence. In this embodiment, a monitoring system is adopted to monitor the operating status of the DC switch box so as to cut off the connection between the DC switch box and the bus bar / power supply equipment in the event of a failure, and a breaker and an insulation switch are installed in the DC switch box. By installing it, the DC switch box can be timely intelligent, monitored and protected, and the safety of personnel and property can be guaranteed.

It is a structural schematic diagram of the DC switch box which concerns on Example 1. FIG. It is a structural schematic diagram of the DC switch box which concerns on Example 2. FIG. It is a structural schematic diagram of the monitoring system of the DC switch box which concerns on Example 3. FIG. It is a flowchart of the monitoring method of the DC switch box which concerns on Example 4. FIG. It is a flowchart of the monitoring method of the DC switch box which concerns on Example 5. FIG. It is a flowchart of the monitoring method of the DC switch box which concerns on Example 6. It is a flowchart of the monitoring method of the DC switch box which concerns on Example 7. FIG.

Example 1
The DC switch box according to this embodiment can be applied to a usage scene of an orbital traffic power supply system. FIG. 1 is a schematic structural diagram of a DC switch box according to the first embodiment. As shown in FIG. 1, the DC switch box 10 according to this embodiment includes a positive electrode box 11, a negative electrode box 12, a breaker 13, and an insulating switch 14. Here, the first end of the breaker 13 is connected to the bus bar DC + of the positive electrode box 11, the second end of the breaker 13 is connected to the first end of the insulation switch 14, and the breaker 13 is connected to the first end of the insulation switch 14 when the electric circuit fails. It is used to cut off the connection between the positive electrode box 11 and its bus bar DC +. The second end of the insulation switch 14 is connected to the overhead line 15 and is used to cut off the voltage signal between the DC switch box and the overhead line 15.

Illustratively, in a track traffic power supply system in a related technology, the AC high voltage value of the main substation of a towing substation is stepped down by a rectifying element, rectified to a DC voltage of 1500 V, and supplied to an overhead line by a DC switch box. .. However, during actual use, failures such as short circuits can occur in the electric circuit, which is disadvantageous for the operation of track traffic. Therefore, when a failure occurs, the corresponding protection device can protect against track traffic. Need to be installed. As shown in FIG. 1, the box of the DC switch box 10 according to the present embodiment includes a positive electrode box 11 and a negative electrode box 12, and may be further provided with another feeder line box, a shunt trip box, and the like. .. The corresponding DC switch box 10 further comprises a breaker 13 and an insulating switch 13. The breaker 13 cuts off the connection between the positive electrode box 11 and the bus bar DC + of the positive electrode box 11 when the DC switch box 10 fails so as to ensure that the positive electrode box and the corresponding device are not damaged by the short-circuit current. be able to. Further, the insulation switch 14 connected in series with the breaker 13 electrically separates the DC switch box 10 from the overhead line 15. Here, the AC high voltage value may be 2400V or 3600V.

Preferably, the breaker 13 of the DC switch box 10 according to the present embodiment may be a DC breaker. Since the DC breaker has a high breaking capacity and limiting characteristics, it can be ensured that the breaker 13 is not damaged under the condition of a short circuit current, and the safe distance can be shortened based on the high breaking capacity.

The DC switch box according to this embodiment controls the connection between the positive electrode box and the bus bar by a breaker, and adopts an insulation switch to cut off the DC switch box and the electrical equipment in the overhead line when a failure occurs. In addition, the connection between the DC switch box and the bus or overhead line will be promptly cut off to ensure the safety of personnel and property.

Example 2
The DC switch box monitoring system according to this embodiment is applied to a usage scene for monitoring the operating status of the DC switch box in the track traffic power supply system. FIG. 2 is a schematic structural diagram of the DC switch box according to the second embodiment. The DC switch box monitoring system according to this embodiment is applied to the DC switch box according to this embodiment. As shown in FIG. 2, the monitoring system includes a signal acquisition module 20, a server 30, a communication module 40, and a processor 50.

Here, the signal acquisition module 20 has a first input end connected to the bus bar of the positive electrode box 11 of the DC switch box 10, a second input end connected to the bus bar of the negative electrode box 12 of the DC switch box 10, and a third input. The end is connected to the second end of the breaker 13 of the DC switch box 10 and is used to collect the signal of the bus bar of the positive electrode box 11, the signal of the bus bar of the negative electrode box 12, and the electric signal of the breaker 13 output. The input end of the communication module 40 is connected to the output end of the signal acquisition module 20, the first transmission end of the communication module 40 is connected to the server 30, and the second transmission end of the communication module 40 is connected to the control end of the processor 50. The communication module 40 is used to transmit the signal collected by the signal acquisition module 20 to the server 30 and transmit the communication between the server 30 and the processor 50. Server 30 to build a database to match the signal signal acquisition module 20 collects, monitors the signal signal acquisition module 20 is collected in real-time, by the communication module 40 to send a signal to the processor 50 Used. The output end of the processor 50 is connected to the control end of the DC switch box 10 and is used to perform a protective operation on the DC switch box 10 based on the signal transmitted by the server 30.

Illustratively, in an orbital traffic power supply system, the DC switch box is the core of the power supply equipment. While using the power supply system for orbital traffic, the failure probability of the DC1500V DC system is uncertain due to uncertain factors such as bad environment and deterioration of equipment. Common types of failure include overhead line overload, transmitter failure, rectifier room and high voltage room alarms, and the like. Therefore, it is necessary for the parties concerned to always pay attention to changes in parameters such as temperature and humidity of the equipment, report any abnormalities in a timely manner, analyze the failure type by the parties concerned, and then carry out the inspection. In this way, the method in which a person performs a patrol inspection to detect and analyze a failure is not sufficient for intelligence and the manpower is limited, so that the failure cannot be detected in a timely manner, and the personnel and property Highly likely to cause loss.
As shown in FIG. 2, in this embodiment, the signal acquisition module 20 collects the signal of the bus bar of the positive electrode box 11, the signal of the bus bar of the negative electrode box 12, and the electric signal output from the output end of the breaker 13, respectively, and collects electricity. By uploading the signal to the server 30 by the communication module 40, the server 30 matches the signal collected by the signal collection module 20, constructs a corresponding database, monitors the collected signal in real time, and makes a DC switch box. Provided is a monitoring system of a DC switch device that realizes all recorded waveforms for the operating conditions of track traffic related to 10 and the overhead line 15. Further, the communication module 40 further transmits communication between the server 30 and the processor 50, and the corresponding control is performed based on the database constructed by the processor 50 in the server 30 and the real-time signal collected by the signal collection module 20. Signals can be transmitted to implement protective measures on the relevant orbital traffic equipment in the DC switch box 10 and overhead line 15.

The DC switch box monitoring system according to this embodiment detects the operating status of the DC switch box and overhead line in the entire process, constructs a corresponding database, and monitors the operating status of the DC switch box and overhead line in real time. As a result, the current failure status can be determined in a timely manner, the DC switch box and the overhead line can be intelligently monitored, and the safety of personnel and property can be ensured.

Example 3
The present embodiment provides optimization based on the above embodiment, and employs a shunt based on the above embodiment to detect an electric signal output from a breaker output end in a DC switch box. FIG. 3 is a schematic structural diagram of the DC switch box monitoring system according to the third embodiment. As shown in FIG. 3, the monitoring system according to the present embodiment includes a signal acquisition module 20, a server 30, a communication module 40, a processor 50, and a shunt 60. Here, the first end of the current divider 60 is connected to the second end of the breaker 13 of the DC switch box 10, and the second end is connected to the first end of the insulation switch 14 of the DC switch box 10 from the breaker 13. It is used to limit the output signal and make the electrical signal collected by the signal acquisition module 20 more accurate.

Preferably, the shunt 60 comprises a current sensing end and a voltage sensing end, and correspondingly, the third input end of the signal acquisition module 20 may include a current collecting end and a voltage collecting end. Here, the current collecting end of the signal collecting module 20 is connected to the current detecting end of the diversion device 60, the voltage collecting end of the signal collecting module 20 is connected to the voltage detecting end of the diversion device 60, and the current detecting end of the diversion device 60. It is used to detect the current and the voltage at the voltage detection end, respectively.

Illustratively, in an orbital traffic power supply system, it is necessary to employ a reliable measuring system that measures the current signal flowing through the DC switch box to ensure that the high voltage DC switch box has reliable adjustment and protection functions. There is. The shunt can measure the current value flowing through the shunt by connecting the DC shunt in series in a high-voltage DC circuit as an accurate resistance capable of passing a large current. The signal collection module 20 in the monitoring system according to the present embodiment realizes that the electric signal output from the output end of the breaker 13 is accurately collected based on the voltage and current values at both ends of the collection shunt 60.

Preferably, the signal acquisition module 20 comprises an optical fiber isolated amplifier. The electrical signal collected by the signal acquisition module 20 by the shunt can be converted into a numerical signal, transmitted via an optical fiber, and electrically isolated. In the signal acquisition module 20, an optical fiber isolated amplifier can be adopted to transmit a signal to have higher measurement accuracy and measurement range.

Preferably, as shown in FIG. 3, based on the above embodiment, the DC switch box monitoring system according to the present embodiment further includes a master machine 70. Here, the master machine 70 is connected to the server 30 via the communication module 40, stores and displays the database constructed by the server 30 and the real-time monitoring data of the signal collection module 20, receives an external control command, and communicates. It is used to transmit to the server 30 by the module 40. The server 30 is further used to transmit a signal to the processor 50 by the communication module 40 in response to an external control command.

Illustratively, a master machine 70 is installed in a DC switch box monitoring system, and communication with the server 30 is realized by a communication module 40, whereby the master machine 70 intuitively displays matching data in the server. It can be stored and the electric signal collected in real time by the signal acquisition module 20 can be received. At the same time, the engineer predicts the possibility of failure by observing the data displayed on the master machine 70, and inputs the control command related to the master machine 70 to transmit the control command to the communication module 40. Can be transmitted to the processor 50, whereby the processor 50 controls the DC switch box 10 to perform a protective operation.

In the DC switch box monitoring system according to this embodiment, by installing a shunt, the signal collection module collects the electrical signal limited to the shunt current after outputting from the breaker, and the signal collection module collects it. The resulting electrical signal is made more accurate, and more accurate monitoring of the operating status of the DC switch box is realized.

Example 4
This embodiment provides a monitoring method for a DC switch box. The monitoring method is applied to the usage scene of all recorded waveforms of the operating status of the DC switch box. The method is applied to monitoring a DC switch box according to the present embodiment and is performed on the monitoring system according to the present embodiment. FIG. 4 is a flowchart of a DC switch box monitoring method according to the fourth embodiment. As shown in FIG. 4, the monitoring method according to this embodiment includes S410 to S420.

In S410, all recorded waveform data of the electric signal in the DC switch box is acquired, and a database is constructed.

Illustratively, a DC switch box may be a metal closed plant with a nominal operating voltage of generally DC 1500 V or less, mounted inside a door, and air-insulated, divided into a plurality of functional chambers. May be good. For example, the DC switch box described in this embodiment may be divided into a positive electrode box, a negative electrode box, a hand card chamber of a breaker, and the like. The main function of the DC switch box is used in the DC traction power supply system, which distributes DC electrical energy and supplies power to overhead lines or power supply rails. While using the DC switch box, various types of failures may occur due to the operating environment or human operation, so it is necessary to monitor the DC switch box in real time. Since the failure status differs depending on the DC switch box, it is necessary to first collect the electrical signals transmitted in the DC switch box, acquire all the recorded waveform data of the electrical signals of the DC switch box, and build the corresponding database. , Acquire the failure monitoring standard of the DC switch box.
In S420, the electric signal of the DC switch box is detected in real time while using the database, and the operating parameters of the DC switch box are determined.

Illustratively, by constructing a database of a DC switch box, the monitoring standard of the DC switch box, that is, the change status of the electric signal at the failure point of the DC switch box is acquired, and the DC switch box is in operation. By collecting the electrical signals in real time, it is possible to compare with the information stored in the database and grasp the actual operating parameters of the DC switch box, that is, the situation of the failure that may occur. Here, the state of failure that may occur may be the failure probability of the DC switch box, the degree of risk of failure, or the like.

The method for monitoring the DC switch box according to this embodiment is to record the electric signal in the DC switch box in the entire process, construct a corresponding database, and detect the operating status of the DC switch box in real time based on the database. This makes it possible to intelligently monitor the DC switch box in a timely manner and ensure the safety of personnel and property when the DC switch box operates. In this embodiment, the DC switch box monitoring method further includes S430.

In S430, quality evaluation is performed on the DC switch box based on the database and the operating parameters.

Illustratively, by acquiring a database of the DC switch box based on all recorded waveform data of the electric signals of the DC switch box, it is possible to grasp the change status of the electric signals at a plurality of failure points in the DC switch box. Can be done. Then, after comparing the electric signal when the DC switch box actually operates with the information stored in the database, the DC switch box actually operates by acquiring the actual operating parameters of the DC switch box. At that time, the probability of failure and the degree of danger can be obtained. Therefore, the superiority or inferiority quality of the DC switch box can be evaluated.

Preferably, based on the above embodiment, the monitoring method further comprises periodically collecting all recorded waveform data of electrical signals in the DC switch box and updating the data information stored in the database.

Illustratively, while the DC switch box is actually operating, there is a difference between the specific operation information of the DC switch box and the reference operation information due to the influence of the operating environment and human operation, and the failure occurs. Since the points change correspondingly, it is necessary to update the information stored in the database in real time. After collecting all recorded waveform data of electrical signals in real time while the DC switch box is actually operating, it is possible to update the information stored in the database in real time by realigning the information in the data. To do.

Example 5
The present embodiment provides a method of optimizing based on the above embodiment and determining the operating parameters of the DC switch box after detecting the electric signal of the DC switch box in real time. FIG. 5 is a flowchart of a DC switch box monitoring method according to the fifth embodiment. As shown in FIG. 5, the method for monitoring the DC switch box according to the present embodiment includes S501 to S504.

In S501, all recorded waveform data of the electric signal in the DC switch box is acquired, and a database is constructed.

In S502, the electric signal stored in the database is set and calculated, and the operating state of the DC switch box is analyzed. The operating state is a theoretical operating state.

Illustratively, the change tendency of the path current in the DC switch box can be grasped from the accumulation and statistics of all recorded waveform data of the DC switch box and big data for a long time, whereby the DC switch box is applied. The current pattern when the locomotive is started is acquired from the different operating states of the track traffic and the different operating diagrams, and the operation change is set and calculated, and the relay operating status of the rail traction power supply system, that is, the operation of the DC switch box. Understand the situation. Here, in the method of setting and calculating the electric signal stored in the database, the current change tendency of the DC switch box is analyzed by all the recorded waveform data in the database, the parameter value of the setting calculation is determined, and the setting is performed. It may be a method of setting calculation based on the calculation parameter value and the electric signal stored in the database.

In S503, the current change of the DC switch box is tracked in real time according to the operating condition, and the operating parameters of the DC switch box are determined.

Illustratively, the operating status of the DC switch box acquired after setting and calculating the data information stored in the database is the theoretical operating status of the DC switch box, which is the actual operating parameter of the DC switch box. Provide a rationale for the decision. Therefore, by monitoring the DC feed current in real time in the DC switch box, the current change in a special period, for example, the boundary condition of protection activation can be tracked back and forth, a detailed current curve can be obtained, and protection and operation failure Accurately analyze the cause of malfunction or operation and determine the actual operating parameters of the DC switch box.

In S504, quality evaluation is performed on the DC switch box based on the database and the operation parameters.

The monitoring method of the DC switch box according to the present embodiment sets and calculates the data information stored in the database constructed by recording the data in the entire process of the DC switch box, and sets and calculates the theoretical operating state of the DC switch box. By acquiring the data and determining the operating parameters of the DC switch box according to the actual current change tendency, the protection operation in the DC switch box is accurately analyzed, and the DC switch box is intelligently monitored in a timely manner. Achieve what you do.

Example 6
This embodiment is modified based on the above embodiment to provide a method for quality evaluation of a DC switch box. FIG. 6 is a flowchart of a DC switch box monitoring method according to the sixth embodiment. As shown in FIG. 6, the method for monitoring the DC switch box according to the present embodiment includes S601 to S606.

In S601, all recorded waveform data of the electric signal in the DC switch box is acquired, and a database is constructed.

In S602, the electric signal of the DC switch box is detected in real time by the database, and the operating parameters of the DC switch box are determined.

In S603, a DC component and a harmonic component are extracted from the data in the database, and a data graphic is constructed.

Illustratively, in an orbital traffic power supply system, an AC electrical signal is usually rectified, a corresponding DC voltage is obtained and distributed by a DC switch box. The large-capacity non-linear load of the rectification technique consumes a large amount of reactive power and thus generates a harmonic current. The complexity of the harmonic and DC components in the feeding system poses some risk to the feeding system. In a database constructed from all recorded waveform data of a DC switch box electrical signal, the DC and harmonic components of the DC switch box electrical signal influence the determination of the operating parameters of the DC switch box. Therefore, after extracting the DC component and the harmonic component, the corresponding numerical diagram may be constructed. The data graphic may be a combination of data reporting and a histogram, pie chart, etc. for intuitive display and judgment.

In S604, the power distribution status of the DC switch box in the plurality of operating states is determined based on the data graphic and the operating parameters in the plurality of operating states.

In S605, the operation pattern of the DC switch box is acquired based on the power distribution status, and the operation parameters of the DC switch box are determined.

Illustratively, after extracting DC components and harmonic components from the data information stored in the database, the corresponding data graphics are constructed, and the operating states of the track traffic controlled by the DC switch box for multiple periods. And, according to the operating environment, a power distribution comparison table is formed for a corresponding period, the influence tendency of the power distribution and the operating status in a plurality of operating states of the DC switch box is acquired, and the corresponding operating pattern is acquired. The operating parameters of the DC switch box can be determined by the operating pattern.

In S606, the quality of the DC switch box is evaluated based on the database and the operating parameters.

In the DC switch box monitoring method according to this embodiment, after extracting the DC component and harmonic component in the database constructed by recording the electric signal of the DC switch box in the entire process, the corresponding data graphic is displayed. It is constructed, the power distribution status of the DC switch box is acquired according to the operating parameters of the DC switch box in a plurality of operating states, and the operating parameters of the DC switch box are determined. Further, the quality of the DC switch box is evaluated, and the DC switch box can be intelligently monitored in a timely manner.

Example 7
This embodiment is modified based on the technique of the above embodiment to provide a method of monitoring a DC switch box and a method of setting a maintenance standard for the DC switch box. The method of evaluating the quality of the DC switch box based on the database and the operating parameters is to acquire the breakage / trip count and basic parameters of the breaker of the protection device in the DC switch box, and to obtain the basic parameters of the breaker. Includes setting maintenance criteria for the DC switch box based on the number of disconnections / trips and basic parameters. FIG. 7 is a flowchart of a DC switch box monitoring method according to the seventh embodiment. As shown in FIG. 7, the method for monitoring the DC switch box according to this embodiment includes S701 to S704.

In S701, all recorded waveform data of the electric signal in the DC switch box is acquired, and a database is constructed.

In S702, the electric signal of the DC switch box is detected in real time by the database, and the operating parameters of the DC switch box are determined. In S703, the breaker disconnection / trip count and the basic parameters in the DC switch box are acquired.

Illustratively, a breaker in a DC switch box may break the connection between the positive electrode box in the DC switch box and the busbar of the DC switch box in the event of a failure to ensure that the positive electrode box and corresponding equipment are not damaged. it can. The breaker's breaking ability and the quality of the limiting characteristics are important characteristics for evaluating the speed of operation of the breaker under the condition of short-circuit current. However, during actual operation, the breaker in the DC switch box disconnects / trips depending on the current conditions under the actual operating conditions. Therefore, when further monitoring the DC switch box, the basic parameters of the breaker and the actual disconnection occur. / Need to be tied to the trip situation.

In S704, the maintenance standard of the DC switch box is set according to the number of breaks / trips of the breaker and the basic parameters.

In S705, quality evaluation is performed on the DC switch box based on the database and the operating parameters.

Illustratively, by monitoring the actual break / trip situation of the breaker, it is possible to grasp the current node in the circuit of the break / trip during the actual operation of the breaker, and the basic operation parameters of the breaker. According to this, the status of disconnection / trip in the breaker is classified and statistic, the status of the DC current when the DC switch box performs the protection operation is acquired, and the maintenance standard corresponding to the DC switch box is set. Maintenance can be performed automatically when the DC switch box is the same or similar.

The method for monitoring the DC switch box according to this embodiment sets maintenance standards for the DC switch box based on the number of breaks / trips of the breaker in the DC switch box and the basic operation parameters of the breaker, and in the same or similar cases, A command to maintain the DC switch box is automatically issued, the DC switch box is intelligentized and monitored in a timely manner, and the safety of personnel and property is ensured.

The DC switch box, its monitoring system, and the monitoring method according to this embodiment solve the technical problem that the DC switch box is not sufficient for intelligence in the related technology and cannot be controlled and monitored in a timely manner. In this embodiment, a monitoring system is used to monitor the operating status of the DC switch box, and a breaker and an insulated switch are installed in the DC switch box. When a failure occurs, the DC switch box and bus bar / power supply equipment The connection with the DC switch box can be cut off, and the DC switch box can be intelligently monitored and protected in a timely manner to guarantee the safety of personnel and property.

Claims (15)

Equipped with positive electrode box, negative electrode box, breaker and insulation switch,
The first end of the breaker is configured to connect to the busbar of the positive electrode box, the second end of the breaker is connected to the first end of the insulating switch, and the breaker is used when the DC switch box fails. It is configured to cut off the connection between the positive electrode box and the bus bar of the positive electrode box.
A DC switch box in which a second end of the insulated switch is connected to an overhead wire, and the insulated switch is configured to cut off and conduct a voltage signal between the DC switch box and the overhead wire. The DC switch box according to claim 1, wherein the breaker is a DC breaker. A DC switch box monitoring system used to monitor the DC switch box according to any one of claims 1 to 2.
Equipped with signal collector, server, communication device and processor
The first input end of the signal collecting device is connected to the bus bar of the positive electrode box of the DC switch box and is configured to collect the signal of the bus bar of the positive electrode box, and the second input end of the signal collecting device is It is connected to the bus bar of the negative electrode box of the DC switch box and is configured to collect the signal of the bus bar of the negative electrode box, and the third input end of the signal collecting device is attached to the second end of the breaker of the DC switch box. Connected and configured to collect electrical signals output from breakers in protective devices,
The input end of the communication device is connected to the output end of the signal collection device, the first transmission end of the communication device is connected to the server, and the second transmission end of the communication device is connected to the control end of the processor. Connected, the communication device is configured to transmit a signal collected by the signal collection device to the server, and transmits communication between the server and the processor.
The server is configured to match the collected signals by the signal collecting device so as to construct a database, monitor the collected signals by the signal collecting device in real time, and transmit the signal to the processor by the communication device.
The output end of the processor is connected to the control end of the DC switch box, and the processor is configured to perform a protective operation on the DC switch box based on a signal transmitted by the server. Monitoring system. With more shunts
The first end of the shunt is connected to the second end of the breaker of the DC switch box, the second end of the shunt is connected to the first end of the insulated switch of the DC switch box, and the shunt is The monitoring system according to claim 3, wherein the signal output from the breaker is limited, and the signal collecting device is configured to collect the limited electrical signal. The shunt includes a current detection end and a voltage detection end, and a third input end of the signal collector includes a current collection end and a voltage collection end.
The current collecting end of the signal collecting device is connected to the current detecting end of the shunt and is configured to detect the current of the current detecting end, and the voltage collecting end is connected to the voltage detecting end of the shunt. The monitoring system according to claim 4, wherein the voltage at the voltage detection end is detected. The monitoring system according to any one of claims 3 to 5, wherein the signal collecting device includes an optical fiber isolated amplifier. Equipped with a master machine
The master machine is connected to the server via the communication device, stores and displays the database in which the server is built and the real-time monitoring data of the signal collection device, receives an external control command, and receives the communication. Configured by the device to send to the server
The monitoring system according to any one of claims 3 to 6, wherein the server is further configured to transmit a signal to the processor by the communication device in response to the external control command. A method for monitoring a DC switch box executed by the DC switch box monitoring system according to any one of claims 3 to 7.
Acquiring all recorded waveform data of electrical signals in the DC switch box and constructing a database,
A method for monitoring a DC switch box, which comprises determining operating parameters of the DC switch box based on a collected signal obtained by detecting an electric signal of the database and the DC switch box in real time. Using the database, it is possible to detect the electrical signal of the DC switch box in real time and determine the operating parameters of the DC switch box.
To set and calculate the electrical signals stored in the database and analyze the operating status of the DC switch box.
The monitoring method according to claim 8, further comprising tracking the current change of the DC switch box in real time according to the operating condition and determining the operating parameters of the DC switch box. Setting and calculating the electrical signal stored in the database
Based on all the recorded waveform data in the database, the current change tendency of the DC switch box is analyzed to determine the parameter value of the setting calculation.
The monitoring method according to claim 9, wherein the setting calculation is performed based on the parameter value of the setting calculation and the electric signal stored in the database. After determining the operating parameters of the DC switch box,
The monitoring method according to claim 8, further comprising performing a quality evaluation on the DC switch box based on the database and the operating parameters. Performing a quality evaluation on the DC switch box based on the database and the operating parameters
To construct a data graphic by extracting DC components and harmonic components from the data in the database.
Determining the power distribution status of the DC switch box in the plurality of operating states based on the data graphic and the operating parameters in the plurality of operating states.
The monitoring method according to claim 11, further comprising acquiring an operation pattern of the DC switch box and determining an operation parameter of the DC switch box based on the power distribution status. The monitoring method according to claim 8, further comprising regularly collecting all recorded waveform data of electrical signals in the DC switch box and updating the data information stored in the database. Before quality evaluation of the DC switch box based on the database and the operating parameters
Acquiring the breaker disconnection / trip count and basic parameters in the DC switch box
The monitoring method according to claim 11, further comprising setting a maintenance standard for the DC switch box based on the number of breaks / trips of the breaker and basic parameters. Performing a quality evaluation on the DC switch box based on the database and the operating parameters
To analyze the failure rate and failure interval time of the DC switch box in real time based on the database and the operation parameters.
The monitoring method according to claim 14, further comprising evaluating the quality of the DC switch box based on the maintenance criteria, failure rate and failure interval time of the DC switch box.