Operation loop on-line monitoring device based on non-intrusive risk-free monitoring

Abstract

The utility model relates to an operation loop on-line monitoring device based on non-intrusive risk-free monitoring, and aims to solve the problem that a current monitoring device has no effective monitoring measures for a direct-current operation loop of a power transformation and distribution substation in the face of numerous control operation loops needing to be monitored, but has monitoring and locking functions, so that the operation loop on-line monitoring device cannot be used for monitoring the direct-current operation loop of the power transformation and distribution substation. The protection device comprises a shell, and a Hall direct current sampling module, an ADC (analog to digital converter) module, a CPU (central processing unit) module, a power module, a communication module, a signal output module and an MMI (man-machine interface) display module are arranged in the shell. According to the utility model, through a mode of collecting the node voltage of the measured loop, the influence of voltage or current fluctuation on the existing loop is not generated, the non-inbound risk-free monitoring can be realized according to the arrangement of the control operation loop needing to be monitored, the complexity and diversity of the operation loop of the protection device are reduced, and the engineering use and maintenance are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit detection, in particular to an online monitoring device for an operating circuit based on non-intrusive risk-free monitoring. Background Art

[0002] With the continuous increase in the mileage of railway electrification operation, the scale of secondary equipment is constantly expanding, and the requirements for relay protection functions are becoming higher and higher. The correctness of the secondary circuit plays a very important role in the correct operation of the relay protection. The abnormality of the secondary circuit will also cause serious system failures, causing the stability of the railway power supply system to be destroyed, and even affecting the normal operation of the train. The secondary circuit includes the AC circuit connecting the mutual inductor and the operating circuit signal circuit system connecting the circuit breaker and various protection and control devices.

[0003] 1. The function of the DC operating circuit is to realize the operation and control of the primary equipment of the railway power supply system such as circuit breakers. It plays an important role in the relay protection system. It is composed of many relays and equipment connection cables. At present, the DC operating circuit that plays the role of operation and control in the relay protection system does not have the functions of online self-test, real-time monitoring and information remote transmission. At the same time, the existing secondary control circuit operation box does not meet the requirements for status maintenance of the equipment. Therefore, for the DC operating circuit that directly acts on the tripping or closing command, there is no effective means to directly detect its working status and action.

[0004] 2. Relay protection is an important part of the substation automation system, and its device itself has a very high level of automation. By incorporating appropriate voltage-type relays into the circuit breaker operating circuit, reliable automatic monitoring of the outlet pressure plate status can be achieved at a relatively small circuit modification cost without affecting the operating circuit performance. The relay protection outlet pressure plate artificially creates an obvious visual breakpoint in the relay protection tripping circuit, which is convenient for operating personnel to correctly judge the circuit status of the protection secondary circuit, and also provides convenience and safety support for maintenance and operation. It is an important guarantee for ensuring the safe operation of the relay protection device. On the other hand, the introduction of the outlet pressure plate itself has become a safety hazard in the tripping circuit: when the outlet pressure plate is misplaced, missed, or the pressure plate is in poor contact, due to the lack of self-checking means for the status of the protection function pressure plate, the problem of improper outlet pressure plate status will not be reflected in time, which may cause protection malfunction or expansion of the fault range, causing unnecessary losses.

[0005] 3. At present, the circuit breakers in 110kV and below substations generally have only or use only one tripping coil. Correspondingly, the operating circuit in the microcomputer line protection device is also relatively simple, and the principle wiring is basically the same, only the selection of components or partial wiring is different. In conventional manned substations, the closing operation of the circuit breaker is completed by the duty personnel turning the control switch. Generally, when the control switch is turned to the closing position, it does not return immediately, but continues to stay for several seconds to ensure that the circuit breaker is closed in place. For unmanned substations, due to the use of microcomputer protection or substation automation system, the operation of the circuit breaker is completed remotely, and the operation instructions are transmitted through the network. Considering that the remote control closing pulse and protection closing pulse are very short, in order to ensure reliable closing of the circuit breaker, the microcomputer protection has an additional closing holding relay in the operation circuit compared with the conventional protection. Practice has shown that in recent years, with the widespread application of microcomputer protection in the new construction or expansion of railway power supply systems, the tripping and closing coils or contactors of switches often burn out during the commissioning and operation of the equipment, resulting in delays in power transmission and electrical isolation of the opening operation. Comparing the accident records in recent years, it is found that the number of tripping and closing coils burns out with the application of microcomputer protection devices.

[0006] At present, various anti-accident measures have been formulated to address the problems existing in the secondary circuit. However, these measures mainly emphasize technical measures to ensure that the wiring is not wrong, and there are no technical measures to monitor normal operation.

[0007] The DC control circuit of the substation is usually equipped with automatic reclosing, manual closing, manual tripping and remote-operated tripping and closing. When a behavior occurs, the control can record the complete process of the behavior, which will provide favorable evidence for analyzing the cause of the accident and distinguishing responsibilities. But the problem is that with so many control operation circuits that need to be monitored, there is still no effective monitoring measure for the DC operation circuit of the substation. One view is that if monitoring and locking functions are added to the operation circuit, the complexity and diversity of the protection device operation circuit will be further increased, which is not conducive to engineering use and maintenance. However, under the general trend of unmanned development of substations, it is very meaningful to find defects in the control circuit in time, ensure that the system can quickly isolate the fault after a fault occurs, and ensure the stability of the railway power supply system. In view of this, we propose an online monitoring device for the operation circuit based on non-intrusive and risk-free monitoring. Utility Model Content

[0008] The purpose of the utility model is to overcome the shortcomings of the prior art, meet the actual needs, and provide an online monitoring device for the operating circuit based on non-intrusive and risk-free monitoring to solve the technical problem that the current monitoring device still has no effective monitoring measures for the DC operating circuit of the substation when faced with many control operating circuits that need to be monitored, and adding monitoring and locking functions will further increase the complexity and diversity of the operating circuit of the protection device, which is not conducive to engineering use and maintenance.

[0009] In order to achieve the purpose of the utility model, the technical solution adopted by the utility model is: designing an online monitoring device for an operating circuit based on non-intrusive risk-free monitoring, including a housing;

[0010] The housing is provided with a Hall DC sampling module, an ADC module, a CPU module, a power module, a communication module, a signal output module and an MMI display module;

[0011] The output point of the Hall DC sampling module is connected to the node voltage of the measured circuit for collecting DC voltage, and the output end of the Hall DC sampling module is connected to the ADC module;

[0012] The input end of the ADC module is connected to the Hall DC sampling module, and the output module of the ADC module is connected to the CPU module;

[0013] The CPU module is connected to the ADC module, the signal output module, the MMI display module, and the communication module, and the CPU module analyzes and processes the DC voltage collected by the Hall DC sampling module, and exchanges information of the analysis results through the signal output module, the MMI display module, and the communication module to achieve online monitoring of the circuit under test.

[0014] Preferably, the power module provides power for the device, and the output end of the power module is connected to the CPU module, the MMI display module, the ADC module, and the communication module to provide power.

[0015] Preferably, the communication module is connected to a communication management machine, and the communication management machine is connected to a cloud server. The communication management machine uploads signals to the cloud server in a 4G wireless manner to achieve remote online monitoring of the operation loop.

[0016] Preferably, the communication manager communicates with the communication module using the standard Modbus protocol, and the communication manager communicates with the cloud server using the MQTT protocol via 4G.

[0017] Preferably, a magnetic key is provided on the back of the shell, and two through holes for screws to pass through are provided on both sides of the shell.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. The utility model collects the node voltage of the circuit under test, directly connects the voltage point that needs to be collected without affecting the existing circuit, so that the components in the device do not produce voltage or current fluctuations on the existing circuit. It can be set according to the control operation circuit to be monitored to achieve non-invasive risk-free monitoring, reduce the complexity and diversity of the operating circuit of the protection device, and facilitate engineering use and maintenance.

[0020] 2. The utility model solves the monitoring problems of loose operation circuit wiring, loose connection of lines, etc., realizes loose and loose connection intelligent alarm, improves the efficiency during debugging, and improves the efficiency of loose circuit wiring and loose connection detection after production.

[0021] 3. The utility model solves the problem of real-time monitoring through real-time monitoring, and develops a real-time loop online monitoring device based on the hard contact signal. At the same time, it develops alarm judgment logic, adopts conventional Modbus protocol, and uploads it to the cloud server through the communication management machine using 4G wireless method.

[0022] 4. The utility model can intuitively display the node voltage status by solving the existing monitoring blind spot problem, and can reflect the working status between the operating circuit board and the operating mechanism. By proposing a node monitoring solution and a human-computer interaction interface, the operating circuit monitoring blind spot is solved and visual monitoring is realized.

[0023] 5. The utility model effectively monitors the circuit breaker operation circuit, breaks through the dynamic node voltage monitoring and active circuit integrity detection technology of the operation circuit, solves the problem of lack of supervision of the operation circuit action process, can effectively liberate manpower, improve the operation and inspection efficiency of the operation circuit, ensure the speed of fault isolation during accidents, improve the technical level of remote operation and inspection of dispatching, achieve quality and efficiency, and further improve the safety level of the power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic block diagram used to demonstrate the node voltage monitoring method in the present utility model;

[0025] Figure 2 It is a structural schematic diagram for displaying the information uploading method in the utility model. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0027] Example 1: An online monitoring device for an operating circuit based on non-intrusive risk-free monitoring, see Figure 1, including a shell, a magnetic key is provided on the back of the shell, and two through holes for screws to pass through are provided on both sides of the shell, and the shell is magnetically installed in the high-voltage cabinet or the high-voltage cabinet door through the magnetic key provided on the back of the shell, and at the same time, in order to be more reliably installed in a fixed place, the screws are passed through the through holes and screwed into the cabinet body or the cabinet door to achieve further reinforcement of the device;

[0028] Furthermore, in order to achieve non-invasive risk-free monitoring, reduce the complexity and diversity of the protection device operation circuit, and facilitate engineering use and maintenance, see Figure 1 The housing is provided with a Hall DC sampling module, an ADC module, a CPU module, a power module, a communication module, a signal output module and an MMI display module. The output point of the Hall DC sampling module is connected to the node voltage of the circuit under test for collecting DC voltage, and the output end of the Hall DC sampling module is connected to the ADC module. By collecting the node voltage of the circuit under test, the voltage point to be collected is directly connected in parallel without affecting the existing circuit, so that the components in the device do not affect the voltage or current fluctuation of the existing circuit. It can be set according to the control operation circuit to be monitored to achieve non-invasive risk-free monitoring, reduce the complexity and diversity of the operating circuit of the protection device, and facilitate engineering use and maintenance;

[0029] Furthermore, through the node monitoring solution and human-machine interaction interface, the blind spot of operation loop monitoring can be solved. Figure 1 The input end of the ADC module is connected to the Hall DC sampling module, and the output module of the ADC module is connected to the CPU module. The CPU module is connected to the ADC module, the signal output module, the MMI display module, and the communication module. The CPU module analyzes and processes the DC voltage collected by the Hall DC sampling module, and exchanges information of the analysis results through the signal output module, the MMI display module, and the communication module to realize online monitoring of the measured circuit. By solving the existing monitoring blind spot problem, the node voltage state can be intuitively displayed, and the working state between the operation circuit board and the operating mechanism can be reflected. By proposing a node monitoring solution and a human-computer interaction interface, the operation circuit monitoring blind spot is solved and visual monitoring is realized.

[0030] Furthermore, to achieve built-in power supply to reduce the impact of power outages on real-time monitoring, see Figure 1 The power module provides power for the device, and the output end of the power module is connected to the CPU module, MMI display module, ADC module, and communication module to provide power.

[0031] Further, to upload data, see Figure 1 , Figure 2The communication module is connected to the communication management machine, and the communication management machine is connected to the cloud server. The communication management machine uploads the signal to the cloud server in a 4G wireless manner to realize remote online monitoring of the operation loop. The communication management machine and the communication module communicate using the standard Modbus protocol, and the communication management machine and the cloud server communicate using the MQTT protocol via 4G. By solving the real-time monitoring problem, real-time monitoring is achieved through a real-time loop online monitoring device based on hard contact signal upload. At the same time, an alarm judgment logic is developed, using conventional Modbus protocols, and uploaded to the cloud server via the communication management machine using 4G wireless.

[0032] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. An online monitoring device for an operating circuit based on non-intrusive risk-free monitoring, characterized in that: including a housing; The housing is provided with a Hall DC sampling module, an ADC module, a CPU module, a power module, a communication module, a signal output module and an MMI display module; The output point of the Hall DC sampling module is connected to the node voltage of the measured circuit for collecting DC voltage, and the output end of the Hall DC sampling module is connected to the ADC module; The input end of the ADC module is connected to the Hall DC sampling module, and the output module of the ADC module is connected to the CPU module; The CPU module is connected to the ADC module, the signal output module, the MMI display module, and the communication module, and the CPU module analyzes and processes the DC voltage collected by the Hall DC sampling module, and exchanges information of the analysis results through the signal output module, the MMI display module, and the communication module to achieve online monitoring of the circuit under test.

2. The operating circuit online monitoring device based on non-intrusive risk-free monitoring according to claim 1, characterized in that: The power module provides power supply for the device, and the output end of the power module is connected to the CPU module, the MMI display module, the ADC module, and the communication module to provide power supply.

3. The operating circuit online monitoring device based on non-intrusive risk-free monitoring according to claim 1, characterized in that: The communication module is connected to a communication management machine, and the communication management machine is connected to a cloud server. The communication management machine uploads signals to the cloud server in a 4G wireless manner to achieve remote online monitoring of the operation loop.

4. The operating circuit online monitoring device based on non-intrusive risk-free monitoring as claimed in claim 3, characterized in that: The communication management machine communicates with the communication module using the standard Modbus protocol, and the communication management machine communicates with the cloud server using the MQTT protocol via 4G.

5. The operating circuit online monitoring device based on non-intrusive risk-free monitoring according to claim 1, characterized in that: A magnetic key is arranged on the back of the shell, and two through holes for screws to pass through are arranged on both sides of the shell.

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