DC switch cabinet edge monitoring device

Abstract

The utility model provides a DC switch cabinet edge monitoring device comprising a DC circuit breaker, the DC circuit breaker comprises a plurality of auxiliary contacts, and the plurality of auxiliary contacts are arranged at a plurality of positions of a control loop; the monitoring module comprises a current monitoring assembly, an auxiliary position contact monitoring assembly and a distance monitoring assembly, and the monitoring module is connected with the direct current circuit breaker; the edge calculation module is used for receiving a current signal, monitored by the current monitoring assembly, of the direct-current circuit breaker, a state signal of the auxiliary contact and a numerical value signal, monitored by the current monitoring assembly, of the contact connecting rod mechanism, the edge calculation module is provided with a fault triggering threshold value, and when the received signal numerical value is larger than or smaller than the fault triggering threshold value, the fault is triggered. According to the device, the problem that core components in the direct current switch cabinet are not analyzed is solved, and the comprehensiveness and reliability of monitoring of key nodes in the direct current switch cabinet are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to subway equipment monitoring technical field more specifically, relate to a kind of dc switchgear edge monitoring device. BACKGROUND

[0002] Thousands of DC switchgears are widely configured in the rail transit systems of major cities across the country to support the power supply of their subway networks. In the past decade, the 1500V DC switches across the country encountered failures during major emergency repairs. Each power supply branch company has conducted detailed analysis and statistics, and found more than a thousand cases of failures. In view of the main causes of these failures, each company has carried out in-depth special analysis. The analysis results show that the fault of the comprehensive protection device accounts for a considerable proportion, reaching hundreds of cases; the sampling loop fault of the DC switch also occurs from time to time, exceeding dozens of cases; at the same time, the fault of the opening and closing control loop of the DC switch and the fault of the breaker body execution mechanism component also account for a considerable proportion, reaching hundreds of cases and more than a hundred cases respectively. In view of this, it is particularly necessary to establish a device condition monitoring system that comprehensively covers the real-time operating conditions of DC switches to accurately reflect the real operating conditions of each component inside the device and ensure the safe and stable operation of the urban rail transit system. SUMMARY

[0003] The utility model provides a kind of dc switchgear edge monitoring device, to solve the problem that the internal core component of dc switchgear is not analyzed, improve the comprehensiveness and reliability of the key node monitoring inside dc switch.

[0004] To achieve the above purpose, the utility model provides a kind of dc switchgear edge monitoring device, comprising:

[0005] DC circuit breaker, the DC circuit breaker includes a plurality of auxiliary contacts, a plurality of auxiliary contacts are arranged on a plurality of positions of control loop;

[0006] Monitoring module, the monitoring module includes current monitoring component, auxiliary position contact monitoring component and distance monitoring component, the monitoring module is connected with DC circuit breaker, obtains the current signal of DC circuit breaker, the state signal of auxiliary contact and the numerical signal of contact link mechanism;

[0007] Edge computing module, the edge computing module receives the current signal of DC circuit breaker, the state signal of auxiliary contact and the numerical signal of contact link mechanism monitored by current monitoring component, the edge computing module is provided with fault trigger threshold value, when the signal value received is greater than or less than the fault trigger threshold value, the edge computing module outputs fault alarm notice and shows the specific position of signal anomaly.

[0008] In one embodiment, the current monitoring component comprises a current sensor and a current transformer, the current monitoring component collects primary operating current data of the original switch, and the current transformer monitors secondary component operating current data.

[0009] In one embodiment, the auxiliary contact monitoring component comprises a contact closing monitoring unit and a fault location determining unit, the contact closing monitoring unit is connected to the fault location determining unit, and the fault location determining unit determines the location of the fault by monitoring the closing of the auxiliary contact.

[0010] In one embodiment, the distance monitoring component comprises a laser range finder, the laser range finder monitors the travel distance of the contact linkage mechanism of the DC circuit breaker, and the travel distance of the contact linkage mechanism determines the opening and closing state and the wear state of the switch.

[0011] In one embodiment, the current signal monitored by the current monitoring component comprises a relay operating current signal, a coil current signal, and a holding resistor current signal.

[0012] In one embodiment, the contact closing monitoring unit comprises a closing relay auxiliary contact monitoring unit and an opening relay auxiliary contact monitoring unit, the closing relay auxiliary contact monitoring unit monitors the closing of the auxiliary contact during the closing process, and the opening relay auxiliary contact monitoring unit monitors the closing of the auxiliary contact during the opening process.

[0013] In one embodiment, the fault triggering threshold value comprises a current signal threshold value of the DC circuit breaker, a state signal threshold value of the auxiliary contact, and a numerical signal threshold value of the contact linkage mechanism.

[0014] When the received current signal of the DC circuit breaker is greater than or less than the current signal threshold value of the DC circuit breaker, the edge computing module sends an alarm notification.

[0015] When the received state signal of the auxiliary contact is greater than or less than the state signal threshold value of the auxiliary contact, the edge computing module sends an alarm notification.

[0016] When the received numerical signal of the contact linkage mechanism is greater than or less than the numerical signal threshold value of the contact linkage mechanism, the edge computing module sends an alarm notification.

[0017] In one embodiment, the edge computing module is provided with a storage mechanism, which stores the primary operating or secondary operating current signal data and the fault alarm data when the fault alarm notification is output.

[0018] In one embodiment, the storage mechanism stores the primary operating or secondary operating current signal data and a plurality of fault alarm data within a specified period in chronological order.

[0019] In one embodiment, the storage mechanism comprises a data retrieval unit and a communication unit, the data retrieval unit retrieves current signal data in any time period for data analysis.

[0020] The utility model has the following beneficial effects:

[0021] 1. comprehensiveness: by establishing continuous monitoring of the full action process of all key nodes inside the switch, abnormal states during switch operation are quickly discovered, and fault location is realized.

[0022] 2. Reliability: Breakthrough traditional protection device fault trigger record mode and record time limit, realize the length of waveform optional, achieve waveform real-time recording, in order to quickly locate the problem and provide historical data, improve the reliability of fault diagnosis. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the structural schematic diagram of the edge monitoring device of the DC switch cabinet of an embodiment of the utility model;

[0024] Figure 2 It is the result diagram of the contact connecting rod mechanism stroke distance of an embodiment of the utility model;

[0025] Figure 3 It is the DC circuit breaker action opening coil drive current waveform schematic diagram of the edge monitoring device of the DC switch cabinet of an embodiment of the utility model;

[0026] Figure 4 It is the DC circuit breaker action closing coil drive current waveform schematic diagram of the edge monitoring device of the DC switch cabinet of an embodiment of the utility model;

[0027] Figure 5 It is the coil drive current waveform schematic diagram of the primary full start process of the edge monitoring device of the DC switch cabinet of an embodiment of the utility model.

[0028] Among them, 100 is DC circuit breaker;210 is laser sensor;220 is auxiliary contact;230 is current sensor;300 is edge computing module. DETAILED DESCRIPTION

[0029] For the purpose, technical solutions and advantages of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described in more detail below. In the drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all embodiments. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0030] Figure 1 The structure diagram of the edge monitoring device of the DC switch cabinet according to an embodiment of the present application, the edge monitoring device of the DC switch cabinet comprises:

[0031] The DC circuit breaker 100 comprises a plurality of auxiliary contacts 220, and the plurality of auxiliary contacts 220 are arranged at a plurality of positions of the control loop.

[0032] The monitoring module comprises a current monitoring assembly, an auxiliary position contact monitoring assembly and a distance monitoring assembly, the monitoring module is connected with the DC circuit breaker 100, and the current signal of the DC circuit breaker 100, the state signal of the auxiliary contact 220 and the numerical signal of the contact connecting rod mechanism are acquired.

[0033] The edge computing module 300 receives the current signal of the DC circuit breaker 100, the state signal of the auxiliary contact 220 and the numerical signal of the contact connecting rod mechanism monitored by the current monitoring assembly, and the edge computing module 300 is provided with a fault triggering threshold value, when the received signal value is greater than or less than the fault triggering threshold value, the edge computing module 300 outputs a fault alarm notification and displays the specific position of the signal anomaly.

[0034] In one embodiment, the current monitoring assembly comprises a current sensor 230 and a current transformer, the current monitoring assembly collects primary operating current data of the original switch, and the current transformer monitors secondary component working current data.

[0035] Specifically, the current monitoring assembly collects primary operating current data of the original switch, and the current transformer monitors secondary component working current data, so as to continuously monitor the primary operating current of the DC circuit breaker 100 and the current of a plurality of positions of the secondary control loop.

[0036] Further, the original switch refers to the main switch or the main contact in the DC circuit breaker 100. The original switch is the main component in the DC circuit breaker 100, which is responsible for realizing the functions of making and breaking in the circuit.

[0037] Specifically, the original switch bears the main current load in the DC circuit breaker 100, and the current flows through the original switch when the circuit is in a closed state. In order to monitor the operating state of the DC circuit breaker 100, the current monitoring assembly samples the primary operating current data of the original switch, that is, measures the current value flowing through the original switch. This data is crucial for evaluating the performance of the DC circuit breaker 100 and discovering potential faults in a timely manner.

[0038] Therefore, when sampling the primary operating current data of the original switch, the original switch refers to the main switch or main contact used to turn on and turn off the circuit in the DC circuit breaker 100.

[0039] The current monitoring assembly monitors the operating current data of the core secondary components of the DC circuit breaker 100 using a current transformer. As a specially designed transformer, the current transformer can convert high current values into small current values that are easy to measure, thereby facilitating accurate measurement of the current in the secondary control loop. Through the current transformer, the current monitoring assembly can comprehensively monitor the current data at each key position in the secondary control loop, providing detailed operating state information for system maintenance personnel.

[0040] The signals monitored and collected by the current monitoring assembly are converted into digital signals by a relevant current-type analog-to-digital converter.

[0041] The current-type analog-to-digital converter is a device that converts current signals into digital signals. Its principle is to convert current signals into voltage signals, and then convert digital signals through a voltage-type analog-to-digital converter. The current-type analog-to-digital converter usually includes inverter, integrator, comparator, digital output, etc. modules, and has the characteristics of strong anti-interference ability, suitable for high-speed data acquisition and processing.

[0042] In one embodiment, the auxiliary contact monitoring assembly includes a contact closure monitoring unit and a fault location determination unit, the contact closure monitoring unit is connected with the fault location determination unit, and the fault location determination unit determines the location of the fault by monitoring the closure of the auxiliary contact 220.

[0043] In one embodiment, the distance monitoring assembly includes a laser range finder, the laser range finder monitors the stroke distance of the contact linkage mechanism of the DC circuit breaker 100, and determines the switch opening and closing state and wear state through the stroke distance of the contact linkage mechanism, Figure 2 The result graph of the stroke distance of the contact linkage mechanism of the DC circuit breaker 100 according to the embodiment of the utility model can be seen, and the stroke length of different test points can be seen.

[0044] Specifically, as the contact link mechanism is used, its travel distance will change due to wear and tear and the like. Therefore, by continuously monitoring the travel data of the contact link mechanism, the change can be captured.

[0045] Further, the laser range finder can also be used to monitor the travel distance of the contact link mechanism of the DC circuit breaker 100 by the laser sensor 210.

[0046] In one embodiment, the current signals monitored by the current monitoring assembly include relay operating current signals, coil current signals, and holding resistor current signals.

[0047] In one embodiment, the contact closing monitoring unit includes a close relay auxiliary contact monitoring unit and an open relay auxiliary contact monitoring unit. The close relay auxiliary contact monitoring unit monitors the closing of the auxiliary contact 220 during the closing operation, and the open relay auxiliary contact monitoring unit monitors the closing of the auxiliary contact 220 during the opening operation.

[0048] Specifically, before the closing operation starts, the circuit breaker is usually in an open state, at which time the normally open contact of the auxiliary contact 220 is in an open state, and the normally closed contact is in a closed state. At this time, the contact closing monitoring unit uses the open relay auxiliary contact monitoring unit to monitor the closing of the auxiliary contact 220.

[0049] Before the opening operation starts, the circuit breaker is in a closed state, at which time the normally open contact of the auxiliary contact 220 is in a closed state, and the normally closed contact is in an open state. At this time, the contact closing monitoring unit uses the close relay auxiliary contact monitoring unit to monitor the closing of the auxiliary contact 220.

[0050] In one embodiment, the fault triggering threshold value includes a current signal threshold value of the DC circuit breaker 100, a state signal threshold value of the auxiliary contact 220, and a numerical signal threshold value of the contact link mechanism.

[0051] When the received current signal of the DC circuit breaker 100 is greater than or less than the current signal threshold value of the DC circuit breaker 100, the edge computing module 300 issues an alarm notification.

[0052] When the received state signal of the auxiliary contact 220 is greater than or less than the state signal threshold value of the auxiliary contact 220, the edge computing module 300 issues an alarm notification.

[0053] When the received numerical signal of the contact link mechanism is greater than or less than the numerical signal threshold value of the contact link mechanism, the edge computing module 300 issues an alarm notification.

[0054] In one embodiment, the edge computing module 300 is provided with a storage mechanism that stores the primary or secondary operating current signal data and the fault alarm data when the fault alarm notification is output.

[0055] In one embodiment, the storage mechanism stores the primary or secondary operating current signal data and a plurality of fault alarm data within a specified period in chronological order.

[0056] In one embodiment, the storage mechanism includes a data retrieval unit and a communication unit, and the data retrieval unit retrieves the current signal data within any time period for data analysis.

[0057] Specifically, the waveform recording mode of the current is a fault triggering mode, and the longest recording length is 4096 points, which is about 100ms. By independently installing a high-frequency sampling device or connecting with the original sampling output node, the same source operating current data is sampled and recorded in a cyclic manner, i.e.

[0058] Further, the storage mechanism can directly generate a waveform or export raw data for further detailed analysis, Figure 3 The DC circuit breaker action opening coil drive current waveform diagram of the DC switch cabinet edge monitoring device of one embodiment of the utility model, Figure 4 The DC circuit breaker action closing coil drive current waveform diagram of the DC switch cabinet edge monitoring device of one embodiment of the utility model, Figure 5 The coil drive current waveform diagram of the whole starting process of the DC switch cabinet edge monitoring device of one embodiment of the utility model, and the specific state of the current signal can be seen from the diagram.

[0059] The device is based on the monitoring of key secondary components in the DC switch, directly or indirectly detects the current or voltage signal in the opening and closing loop operation of the switch, introduces a fault position judgment unit, establishes the logical judgment between the protection device drive loop, the intermediate transmission loop and the actuator, and quickly feeds back and locates the real-time state of the equipment with light edge computing, quickly discovers the abnormal state in the switch operation and the fault positioning after the abnormality, promotes the state feedback and state of the DC switch equipment, improves the monitoring depth of the key equipment of the power DC traction, and further provides an intelligent solution for the safe and reliable operation of the DC traction equipment.

[0060] The utility model has the advantages of:

[0061] 1. Comprehensive: By establishing the continuous monitoring of the full action process of all key nodes inside the switch, the abnormal state in the switch operation process is quickly found, and then fault location is realized.

[0062] 2. Reliability: Breakthrough the traditional protection device fault trigger record mode and record time limit, realize the time length of waveform selection, achieve real-time waveform recording, in order to quickly locate the problem and provide historical data, improve the reliability of fault diagnosis.

[0063] In the description of the present application, it should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For the convenience of description, the size of each part shown in the drawings is not drawn according to the actual proportional relationship. The technology, method and equipment known to those skilled in the related art can not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as part of the authorized description. In all examples shown and discussed here, any specific value should be interpreted as only an example, not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0064] It should be noted that in this application, the term "include", "contain" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or device. It should also be noted that the scope of the method and device in the embodiments of the present application is not limited to the order of performing the functions shown or discussed, but can also include performing the functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method can be performed in an order different from the described order, and various steps can also be added, omitted or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0065] In addition, it should be noted that, unless otherwise explicitly specified and limited, the "connection", "drive" and similar words used in the description of the present application should be broadly understood, which can be direct or through intermediate media, and can also be the relationship between two elements inside. The skilled in the art can understand its specific meaning in the present application according to the specific circumstances.

[0066] The above embodiments are provided to persons skilled in the art to implement or use the present application, and the persons skilled in the art can make various modifications or changes to the above embodiments without departing from the application idea of the present application, and thus the protection scope of the present application is not limited by the above embodiments, but should be the maximum scope of the innovative features mentioned in the claims.

Claims

1. A DC switchgear edge monitoring device, characterized by, The direct-current switch cabinet edge monitoring device comprises: The direct-current circuit breaker comprises a plurality of auxiliary contacts arranged at a plurality of positions of a control loop; The monitoring module comprises a current monitoring assembly, an auxiliary position contact monitoring assembly, and a distance monitoring assembly, and is connected with the direct-current circuit breaker to acquire a current signal of the direct-current circuit breaker, a state signal of the auxiliary contact, and a numerical signal of the contact connecting rod mechanism; The edge calculation module receives the current signal of the direct-current circuit breaker, the state signal of the auxiliary contact, and the numerical signal of the contact connecting rod mechanism monitored by the current monitoring assembly, and is provided with a fault triggering threshold value, and when the received signal value is greater than or less than the fault triggering threshold value, the edge calculation module outputs a fault alarm notification and displays the specific position of the signal anomaly.

2. The DC switchgear edge monitoring device according to claim 1, characterized in that, The current monitoring assembly comprises a current sensor and a current transformer, collects primary operating current data of the original switch, and monitors secondary component working current data by the current transformer.

3. The DC switchgear edge monitoring device according to claim 1, characterized in that, The auxiliary position contact monitoring assembly comprises a contact closing monitoring unit and a fault position judgment unit, the contact closing monitoring unit is connected with the fault position judgment unit, and the fault position judgment unit judges the position of the fault occurrence by monitoring the closing condition of the auxiliary contact.

4. The DC switchgear edge monitoring device of claim 1, wherein, The distance monitoring assembly comprises a laser range finder, monitors the stroke distance of the contact connecting rod mechanism of the direct-current circuit breaker, and determines the switch opening and closing state and the wear state by the stroke distance of the contact connecting rod mechanism.

5. The DC switchgear edge monitoring device of claim 1, wherein, The current signal monitored by the current monitoring assembly comprises a relay working current signal, a coil current signal, and a holding resistor current signal.

6. The DC switchgear edge monitoring device according to claim 3, characterized in that, The contact closing monitoring unit comprises a closing relay auxiliary position contact monitoring unit and an opening relay auxiliary position contact monitoring unit, the closing relay auxiliary position contact monitoring unit monitors the closing condition of the auxiliary contact in the closing process, and the opening relay auxiliary position contact monitoring unit monitors the closing condition of the auxiliary contact in the opening process.

7. The DC switchgear edge monitoring device of claim 1, wherein, The fault triggering threshold value comprises a current signal threshold value of the direct-current circuit breaker, a state signal threshold value of the auxiliary contact, and a numerical signal threshold value of the contact connecting rod mechanism; When the received current signal of the direct-current circuit breaker is greater than or less than the current signal threshold value of the direct-current circuit breaker, the edge calculation module issues an alarm notification; When the received state signal of the auxiliary contact is greater than or less than the state signal threshold value of the auxiliary contact, the edge calculation module issues an alarm notification; When the received numerical signal of the contact connecting rod mechanism is greater than or less than the numerical signal threshold value of the contact connecting rod mechanism, the edge calculation module issues an alarm notification.

8. The DC switchgear edge monitoring device of claim 1, wherein, The edge calculation module is provided with a storage mechanism, which stores the primary operating or secondary operating current signal data and the fault alarm data when the fault alarm notification is output.

9. The DC switchgear edge monitoring device according to claim 8, characterized in that, The storage mechanism stores the primary operating or secondary operating current signal data and a plurality of fault alarm data in a specified period according to time sequence.

10. The DC switchgear edge monitoring device according to claim 9, characterized in that, The storage mechanism comprises a data retrieval unit and a communication unit, and the data retrieval unit retrieves the current signal data in any time period for data analysis.

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