Abnormal discharge identification method, device and system for sulfur hexafluoride circuit breaker

Abstract

The embodiment of the invention discloses a method, a device and a system for identifying abnormal discharge of a sulfur hexafluoride circuit breaker. The method comprises the following steps of: receiving a gas pressure data sequence of the sulfur hexafluoride circuit breaker, which is acquired and uploaded by a sulfur hexafluoride density relay in real time; drawing a gas pressure time curve of the sulfur hexafluoride circuit breaker according to the gas pressure data sequence; determining a communication mode of performing data communication with the sulfur hexafluoride density relay at the current moment, and obtaining a curve change extreme value of the gas pressure time curve based on the communication mode; and comparing the curve change extreme value with a preset pressure change threshold value, and when the curve change extreme value is greater than the preset pressure change threshold value, judging that abnormal discharge exists in the sulfur hexafluoride circuit breaker. Whether abnormal discharge occurs in the sulfur hexafluoride circuit breaker or not is judged by monitoring the gas pressure sudden increase phenomenon during arc discharge in the sulfur hexafluoride circuit breaker, and the problem that a mechanical density relay cannot monitor an abnormal discharge event in the circuit breaker is solved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of power system fault identification, and in particular to a method, device and system for identifying abnormal discharge of a sulfur hexafluoride circuit breaker. Background Art

[0002] Sulfur hexafluoride circuit breakers use sulfur hexafluoride gas as an insulating medium and arc extinguishing medium. Under normal circumstances, the high-voltage arc in the sulfur hexafluoride circuit breaker is extinguished by sulfur hexafluoride adsorption and the toxic substances produced after the arc is extinguished are adsorbed by the active alumina in it. However, due to certain inducements (such as lightning strikes, frequent reclosing, etc.), excessive voltage is generated, the circuit breaker current is too large, the arc is too high, and the gas in the gas chamber cannot extinguish the arc, that is, an explosion occurs. Therefore, timely and accurate detection of abnormal discharge events inside the circuit breaker is the key to ensuring the safe operation of the circuit breaker.

[0003] At present, the gas density monitoring on sulfur hexafluoride circuit breakers is basically done by mechanical sulfur hexafluoride density relays. The mechanical sulfur hexafluoride density relay is designed with a locking contact. When the gas pressure is lower than the pressure value corresponding to the locking contact, the relay outputs a switch signal to the outside. The control mechanism detects the signal to determine whether the sulfur hexafluoride gas in the circuit breaker has reached the normal operating density condition, so as to prevent the sulfur hexafluoride gas pressure (density) in the circuit breaker from being too low, causing equipment failure or danger. However, the mechanical density relay cannot monitor abnormal discharge events inside the circuit breaker. Summary of the invention

[0004] The present application proposes a method, device and system for identifying abnormal discharge of a sulfur hexafluoride circuit breaker to identify abnormal discharge events inside the sulfur hexafluoride circuit breaker.

[0005] In a first aspect, an embodiment of the present invention provides a method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker, comprising:

[0006] Receive the gas pressure data sequence of the sulfur hexafluoride circuit breaker collected and uploaded in real time by the sulfur hexafluoride density relay;

[0007] A gas pressure-time curve of the sulfur hexafluoride circuit breaker is obtained by drawing the gas pressure data sequence;

[0008] Determine a communication mode for data communication with the sulfur hexafluoride density relay at a current moment, and obtain a maximum value of a curve change of the gas pressure-time curve based on the communication mode;

[0009] The maximum change value of the curve is compared with a preset pressure change threshold value. When the maximum change value of the curve is greater than the preset pressure change threshold value, it is determined that abnormal discharge exists in the sulfur hexafluoride circuit breaker.

[0010] In a second aspect, an embodiment of the present invention provides a method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker, comprising:

[0011] Performing this data collection according to the sampling frequency determined after the gas pressure data in the sulfur hexafluoride circuit breaker was collected last time to form a gas pressure data sequence;

[0012] Obtain the difference between the gas pressure data collected this time and the gas pressure data collected last time;

[0013] Determine the sampling frequency of the next data collection and the communication mode adopted when uploading the gas pressure data to the background server this time according to the difference and the preset threshold;

[0014] The gas pressure data sequence is uploaded to the background server according to the communication mode, so that the background server determines whether there is abnormal discharge in the sulfur hexafluoride circuit breaker based on the communication mode and the gas pressure data sequence.

[0015] In a third aspect, an embodiment of the present invention provides a device for identifying abnormal discharge of a sulfur hexafluoride circuit breaker, comprising:

[0016] A data receiving module, used to receive a gas pressure data sequence of a sulfur hexafluoride circuit breaker collected and uploaded in real time by a sulfur hexafluoride density relay;

[0017] A curve drawing module, used for drawing a gas pressure time curve of the sulfur hexafluoride circuit breaker according to the gas pressure data sequence;

[0018] A maximum value acquisition module, used to determine a communication mode for data communication with the sulfur hexafluoride density relay at a current moment, and to acquire a curve change maximum value of the gas pressure time curve based on the communication mode;

[0019] The abnormality determination module is used to compare the maximum value of the curve change with a preset pressure change threshold, and when the maximum value of the curve change is greater than the preset pressure change threshold, determine that the sulfur hexafluoride circuit breaker has abnormal discharge.

[0020] In a fourth aspect, an embodiment of the present invention provides a device for identifying abnormal discharge of a sulfur hexafluoride circuit breaker, comprising:

[0021] A data acquisition module, used to perform data acquisition this time according to the sampling frequency determined after the gas pressure data in the sulfur hexafluoride circuit breaker was acquired last time, so as to form a gas pressure data sequence;

[0022] A difference acquisition module is used to obtain the difference between the gas pressure data collected this time and the gas pressure data collected last time;

[0023] A first determination module, used to determine the sampling frequency of the next data collection and the communication mode adopted when uploading the gas pressure data to the background server this time according to the difference and the preset threshold;

[0024] A data uploading module is used to upload the gas pressure data sequence to the background server according to the communication mode, so that the background server can determine whether there is abnormal discharge in the sulfur hexafluoride circuit breaker based on the communication mode and the gas pressure data sequence.

[0025] In a fifth aspect, an embodiment of the present invention provides a sulfur hexafluoride circuit breaker abnormal discharge identification system, characterized in that it includes:

[0026] A sulfur hexafluoride density relay, a background server and a memory, wherein the memory is connected to the sulfur hexafluoride density relay and the background server respectively, the sulfur hexafluoride density relay comprises a pressure sensor, a control module and a communication module, the control module is connected to the pressure sensor and the communication module respectively, the sulfur hexafluoride density relay is connected to the background server through the communication module, and the sulfur hexafluoride density relay is installed on a pipeline connected to the gas chamber of the sulfur hexafluoride circuit breaker to be monitored;

[0027] The pressure sensor is used to collect gas pressure data in the sulfur hexafluoride circuit breaker according to the sampling frequency determined by the control module;

[0028] The communication module is used to upload the gas pressure data collected by the pressure sensor to the background server according to the communication mode determined by the pressure sensor;

[0029] The control module is used to determine the sampling frequency of the pressure sensor and the communication mode of the communication module according to the gas pressure data collected by the pressure sensor;

[0030] The backend server is used to determine whether the sulfur hexafluoride circuit breaker has abnormal discharge according to the gas pressure data and the communication mode;

[0031] The memory is used to store one or more programs;

[0032] The one or more programs are executed by the background server or the sulfur hexafluoride density relay, so that the background server implements the method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker as described in the first aspect of the embodiment of the present invention, and the sulfur hexafluoride density relay implements the method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker as described in the second aspect of the embodiment of the present invention.

[0033] The embodiment of the present invention draws a gas pressure-time curve of a sulfur hexafluoride circuit breaker, obtains the maximum value of the curve change of the gas pressure-time curve, and compares the maximum value of the curve change with a preset pressure change threshold. When the maximum value of the curve change is greater than the preset pressure change threshold, it is determined that the sulfur hexafluoride circuit breaker has abnormal discharge. Therefore, it is possible to determine whether abnormal discharge occurs in the sulfur hexafluoride circuit breaker by monitoring the sudden increase in gas pressure during arc discharge in the sulfur hexafluoride circuit breaker. This solves the problem that the mechanical density relay cannot monitor abnormal discharge events inside the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a flow chart of a method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in Embodiment 1 of the present invention;

[0035] Figure 2 It is a flow chart of a method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in Embodiment 2 of the present invention;

[0036] Figure 3 It is a flow chart of a method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in Embodiment 3 of the present invention;

[0037] Figure 4 It is a flow chart of a method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in a fourth embodiment of the present invention;

[0038] Figure 5 It is a flow chart of a method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in Embodiment 5 of the present invention;

[0039] Figure 6 This is a schematic diagram of the structure of the abnormal discharge identification device of sulfur hexafluoride circuit breaker provided in the sixth embodiment of the present invention.

[0040] Figure 7 It is a structural schematic diagram of a sulfur hexafluoride circuit breaker abnormal discharge identification device provided in Embodiment 7 of the present invention;

[0041] Figure 8 It is a structural schematic diagram of a sulfur hexafluoride circuit breaker abnormal discharge identification system provided in Embodiment 8 of the present invention;

[0042] Fig. 9 This is a schematic diagram of the application of the sulfur hexafluoride circuit breaker abnormal discharge identification system provided in Example 8 of the present invention. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. It is also necessary to explain that, for ease of description, only the parts related to the embodiments of the present invention are shown in the accompanying drawings, rather than all structures.

[0044] It is understandable that when arc discharge occurs in the sulfur hexafluoride circuit breaker, the temperature of the arc plasma will rise instantly, causing the temperature of the gas in the gas chamber to rise, accompanied by the decomposition of sulfur hexafluoride gas, which will cause the gas pressure in the gas chamber to increase instantly. However, at present, the gas density monitoring on sulfur hexafluoride circuit breakers basically adopts mechanical sulfur hexafluoride density relays, and there are almost no additional pressure monitoring devices. The mechanical sulfur hexafluoride density relay measures the pressure in the sulfur hexafluoride circuit breaker gas chamber and the ambient temperature at its installation location, and adopts a mechanical compensation method to achieve the measurement of gas density. Two locking contacts are designed on the mechanical density relay. When the pressure is lower than the pressure value set by the two locking contacts, a switch signal is output to the outside. The control mechanism detects the signal to determine whether the sulfur hexafluoride gas in the electrical equipment (circuit breaker) has reached the normal operating density condition, so as to prevent the gas pressure (density) from being too low and causing equipment failure or danger. It can be seen that the use of mechanical density relays, on the one hand, cannot realize the continuous collection and transmission of measured values, and on the other hand, mechanical density relays usually do not have overpressure alarm locking points. Therefore, the information monitoring system cannot identify the instantaneous change of gas pressure in the gas chamber, nor can it determine the abnormal discharge phenomenon of sulfur hexafluoride circuit breaker by monitoring the instantaneous increase of gas pressure during arc discharge.

[0045] The technical solution provided by the embodiment of the present invention provides a digital sulfur hexafluoride density relay, which, in addition to retaining all the functions of the original mechanical density relay, measures the gas pressure in the gas chamber in real time through the built-in pressure sensor, and then calculates and judges through the background server, thereby realizing the monitoring of the instantaneous change process of the gas pressure in the gas chamber of the sulfur hexafluoride circuit breaker, so as to identify the sudden increase of gas pressure caused by arc discharge, and thus distinguish the occurrence of abnormal discharge events in the sulfur hexafluoride circuit breaker. That is, it is equivalent to adding an overpressure alarm locking point on the basis of the two low-voltage locking contacts of the original mechanical density relay.

[0046] Embodiment 1

[0047] Figure 1The flowchart of the abnormal discharge identification method of the sulfur hexafluoride circuit breaker provided in the first embodiment of the present invention is applicable to the situation of judging whether abnormal discharge occurs in the sulfur hexafluoride circuit breaker by monitoring the sudden increase of gas pressure during arc discharge in the sulfur hexafluoride circuit breaker. The method can be executed by a background server, which is implemented by hardware and / or software and is generally integrated in the abnormal discharge identification system of the sulfur hexafluoride circuit breaker to which the abnormal discharge identification method of the sulfur hexafluoride circuit breaker is applied.

[0048] like Figure 1 As shown, the method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in this embodiment specifically includes the following steps:

[0049] S101. Receive a gas pressure data sequence of a sulfur hexafluoride circuit breaker collected and uploaded in real time by a sulfur hexafluoride density relay.

[0050] The gas pressure data sequence is obtained by real-time acquisition of gas pressure data in the gas chamber of the sulfur hexafluoride circuit breaker by a sulfur hexafluoride density relay, and the gas pressure data sequence is a time data sequence.

[0051] Optionally, the sulfur hexafluoride density relay is a digital sulfur hexafluoride density relay, which may include a pressure sensor, a control module and a communication module.

[0052] It is understandable that the traditional mechanical density relay is generally only equipped with two low-voltage locking contacts. When the pressure is lower than the pressure value set by the two low-voltage locking contacts, the relay outputs a switch signal to the outside, and the control mechanism detects the signal to determine whether the sulfur hexafluoride gas in the electrical equipment (circuit breaker) has reached the density condition for normal operation, so as to prevent the gas pressure (density) from being too low and causing equipment failure or danger. That is, the traditional mechanical density relay is usually only used to monitor whether the gas pressure drop in the circuit breaker exceeds the set threshold, so as to avoid the inability to play a good insulation and arc extinguishing role due to the low sulfur hexafluoride gas pressure (density) in the circuit breaker. However, the traditional mechanical density relay does not warn about the sudden increase in gas pressure in the circuit breaker caused by arc discharge. Therefore, the overpressure warning when arc discharge occurs in the sulfur hexafluoride circuit breaker can be realized by adding a digital density meter to the original mechanical density relay.

[0053] S102: Draw a gas pressure-time curve of the sulfur hexafluoride circuit breaker according to the gas pressure data sequence.

[0054] The gas pressure-time curve is a curve showing the change of the gas pressure in the sulfur hexafluoride circuit breaker over time.

[0055] It can be understood that by plotting the gas pressure data in the form of a data curve, the change process of the gas pressure in the sulfur hexafluoride circuit breaker can be more intuitively displayed, thereby realizing continuous monitoring of the gas pressure in the sulfur hexafluoride circuit breaker. In addition, after generating the gas pressure time curve, further analysis can be performed to obtain the discrimination basis required for the subsequent discrimination step.

[0056] In one embodiment, the gas pressure time curve of the sulfur hexafluoride circuit breaker is obtained by drawing the gas pressure data sequence, including:

[0057] Obtaining gas pressure data of the sulfur hexafluoride circuit breaker in a target time period before the current moment in the gas pressure data sequence;

[0058] A gas pressure-time curve within the target time period is obtained by plotting the gas pressure data.

[0059] Optionally, the duration for which the gas pressure time curve is displayed, i.e., the target time period is 5 seconds.

[0060] Optionally, the gas pressure time curve may be synchronously updated by updating the data in the gas pressure data sequence. Depending on the amount of data update in the gas pressure data sequence, the gas pressure time curve within the target time period may be partially updated or completely updated.

[0061] S103, determining a communication mode for data communication with the sulfur hexafluoride density relay at the current moment, and obtaining a maximum curve change value of the gas pressure-time curve based on the communication mode.

[0062] The communication mode can be understood as the data transmission rate used by the sulfur hexafluoride density relay when uploading the collected sulfur hexafluoride circuit breaker gas pressure data to the background server.

[0063] Optionally, the communication mode may be a first rate communication mode or a second rate communication mode, wherein the data transmission rate in the first rate communication mode is lower than the transmission rate in the second rate communication mode.

[0064] Optionally, when the gas pressure in the sulfur hexafluoride circuit breaker does not suddenly increase, the sulfur hexafluoride density relay uses the first rate communication mode to upload the collected gas pressure data; when the gas pressure in the sulfur hexafluoride circuit breaker suddenly increases, the sulfur hexafluoride density relay uses the second rate communication mode to upload the collected gas pressure data. Correspondingly, when the gas pressure in the sulfur hexafluoride circuit breaker does not suddenly increase, the background server uses the first rate communication mode to receive the gas pressure data uploaded by the sulfur hexafluoride density relay; when the gas pressure in the sulfur hexafluoride circuit breaker suddenly increases, the background server uses the second rate communication mode to receive the gas pressure data uploaded by the sulfur hexafluoride density relay.

[0065] It is understandable that the communication mode between the sulfur hexafluoride density relay and the background server can be agreed upon by the adopted communication protocol. By identifying the communication mode, it can be determined whether a sudden increase in gas pressure occurs in the sulfur hexafluoride circuit breaker.

[0066] The maximum value of the curve change can be understood as the maximum value or minimum value of the parameter that characterizes the curve change on the gas pressure-time curve.

[0067] Optionally, the curve change maximum value includes a maximum slope value and a maximum amplitude change value, wherein the maximum slope value represents the slope value of the point with the largest slope on the gas pressure-time curve, and the maximum amplitude change value represents the difference between the maximum amplitude value and the minimum amplitude value on the gas pressure-time curve.

[0068] S104, comparing the maximum curve change value with a preset pressure change threshold value, and when the maximum curve change value is greater than the preset pressure change threshold value, determining that abnormal discharge exists in the sulfur hexafluoride circuit breaker.

[0069] The preset pressure change threshold refers to a set threshold corresponding to the maximum value of the curve change, which can be used to indicate an alarm point of gas pressure change.

[0070] It can be understood that the solution of the embodiment of the present invention is to monitor the sudden increase in gas pressure in the sulfur hexafluoride circuit breaker. When it is monitored that the sudden increase in gas pressure in the sulfur hexafluoride circuit breaker reaches a set threshold, it can be determined that abnormal discharge occurs in the sulfur hexafluoride circuit breaker, thereby promptly issuing an alarm to the operation and maintenance personnel, thereby avoiding further dangerous accidents and ensuring the safe operation of electrical equipment.

[0071] Optionally, the preset pressure change threshold includes a preset slope threshold and a preset amplitude value change threshold.

[0072] Optionally, the maximum slope value is compared with a preset slope threshold, and the maximum amplitude change value is compared with a preset amplitude value change threshold. When the maximum slope value is greater than the preset slope threshold or the maximum amplitude change value is greater than the preset amplitude value change threshold, it is determined that abnormal discharge exists in the sulfur hexafluoride circuit breaker.

[0073] The embodiment of the present invention receives the gas pressure data sequence of the sulfur hexafluoride circuit breaker collected and uploaded in real time by the sulfur hexafluoride density relay, draws the gas pressure time curve of the sulfur hexafluoride circuit breaker according to the gas pressure data sequence, and then obtains the maximum value of the curve change of the gas pressure time curve, and compares the maximum value of the curve change with the preset pressure change threshold. When the maximum value of the curve change is greater than the preset pressure change threshold, it is determined that the sulfur hexafluoride circuit breaker has abnormal discharge. Therefore, it is achieved to determine whether abnormal discharge occurs in the sulfur hexafluoride circuit breaker by monitoring the sudden increase in gas pressure during arc discharge in the sulfur hexafluoride circuit breaker. This solves the problem that the mechanical density relay cannot monitor abnormal discharge events inside the circuit breaker.

[0074] Embodiment 2

[0075] Figure 2 This is a flow chart of a method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in Embodiment 2 of the present invention, and this embodiment is further optimized on the basis of Embodiment 1. This embodiment is optimized and added with: obtaining the symbol status of the data communication mode flag at the current moment.

[0076] Furthermore, this embodiment determines the communication mode for data communication with the sulfur hexafluoride density relay at the current moment, and obtains the maximum value of the curve change of the gas pressure time curve based on the communication mode, which is specifically: determining the communication mode for data communication with the sulfur hexafluoride density relay at the current moment according to the symbol state; when it is determined that the communication mode is the second rate communication mode, obtaining the maximum value of the curve change of the gas pressure time curve.

[0077] like Figure 2 As shown, the method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in this embodiment specifically includes the following steps:

[0078] S201. Receive a gas pressure data sequence of a sulfur hexafluoride circuit breaker collected and uploaded in real time by a sulfur hexafluoride density relay.

[0079] S202. Draw a gas pressure-time curve of the sulfur hexafluoride circuit breaker according to the gas pressure data sequence.

[0080] S203: Obtain the symbol status of the data communication mode flag at the current moment.

[0081] Among them, the symbol state is used to indicate the communication mode for data communication with the sulfur hexafluoride density relay, and the communication mode includes a first rate communication mode and a second rate communication mode. The second rate communication mode is the communication mode adopted by the sulfur hexafluoride density relay to upload the gas pressure data sequence under the target condition, and the target condition is that the difference between the gas pressure data collected this time and the gas pressure data collected last time by the sulfur hexafluoride density relay is greater than a preset threshold. The first rate communication mode is the communication mode adopted by the sulfur hexafluoride density relay to upload the gas pressure data sequence under conditions other than the target condition, and the communication rate under the first rate communication mode is less than the communication rate under the second rate communication mode.

[0082] Optionally, the symbol flag may be read from the background server, or may be included in a message queue sent by the sulfur hexafluoride relay to the background server. The specific acquisition method is not limited in the embodiment of the present invention.

[0083] It can be understood that by reading the symbol state of the data communication mode flag at the current moment, the communication mode in which the background server and the sulfur hexafluoride relay communicate at the current moment can be determined. The difference between the gas pressure data collected by the sulfur hexafluoride density relay this time and the gas pressure data collected last time is greater than the preset threshold, that is, the gas pressure in the sulfur hexafluoride circuit breaker is in a state of sudden increase. That is, when the gas pressure in the sulfur hexafluoride circuit breaker suddenly increases, the background server and the sulfur hexafluoride relay communicate in the second rate communication mode, and in other cases, the background server and the sulfur hexafluoride relay communicate in the first rate communication mode.

[0084] S204. Determine a communication mode for performing data communication with the sulfur hexafluoride density relay at the current moment according to the symbol state.

[0085] It can be understood that by determining the communication mode in which the background server and the sulfur hexafluoride relay communicate at the current moment, it can be determined whether a sudden increase in the gas pressure in the sulfur hexafluoride circuit breaker occurs at the current moment.

[0086] S205: When it is determined that the communication mode is the second rate communication mode, a maximum curve change value of the gas pressure time curve is obtained.

[0087] It can be understood that the communication mode for data communication with the sulfur hexafluoride density relay at the current moment is the second rate communication mode, which means that the gas pressure in the sulfur hexafluoride circuit breaker suddenly increases at the current moment. At this time, the maximum value of the curve change on the gas pressure time curve is calculated to obtain a basis for further determining whether abnormal discharge occurs in the sulfur hexafluoride circuit breaker.

[0088] S206: Compare the maximum value of the curve change with a preset pressure change threshold value. When the maximum value of the curve change is greater than the preset pressure change threshold value, it is determined that abnormal discharge exists in the sulfur hexafluoride circuit breaker.

[0089] The embodiment of the present invention receives the gas pressure data sequence of the sulfur hexafluoride circuit breaker collected and uploaded in real time by the sulfur hexafluoride density relay, and draws the gas pressure time curve of the sulfur hexafluoride circuit breaker according to the gas pressure data sequence, and then obtains the maximum curve change value of the gas pressure time curve when it is determined that the communication mode is the second rate communication mode, and compares the maximum curve change value with the preset pressure change threshold value. When the maximum curve change value is greater than the preset pressure change threshold value, it is determined that the sulfur hexafluoride circuit breaker has abnormal discharge. Therefore, it is achieved to determine whether abnormal discharge occurs in the sulfur hexafluoride circuit breaker by monitoring the sudden increase in gas pressure during arc discharge in the sulfur hexafluoride circuit breaker. Thereby solving the problem that the mechanical density relay cannot realize the monitoring of abnormal discharge events inside the circuit breaker.

[0090] Further, as an optional embodiment of the second embodiment, after determining that the sulfur hexafluoride circuit breaker has abnormal discharge, the second embodiment further optimizes and adds:

[0091] Obtain the duration of the rising phase on the gas pressure time curve in the second rate communication mode; determine the danger level of the abnormal discharge event according to the duration and a preset fault level table; and send a corresponding early warning signal to the operation and maintenance control system according to the determined danger level.

[0092] It can be understood that the duration of the rising phase on the gas pressure time curve in the second rate communication mode is obtained, that is, the duration of the sudden increase of gas pressure in the sulfur hexafluoride circuit breaker is obtained. The longer the duration of the sudden increase of gas pressure, the longer the abnormal discharge event lasts, and the greater the potential danger. Therefore, the corresponding danger level can be set accordingly, so as to warn the operation and maintenance personnel according to the corresponding danger level after determining the duration, so as to eliminate the fault in time and avoid further dangerous accidents.

[0093] Embodiment 3

[0094] Figure 3 1 is a flow chart of a method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in Embodiment 3 of the present invention, and this embodiment is further optimized on the basis of Embodiment 2. This embodiment obtains the maximum value of the curve change of the gas pressure time curve, which is specifically: calculating the maximum slope value and the maximum amplitude change value of the gas pressure time curve in the period of the second rate communication mode.

[0095] Furthermore, this embodiment compares the maximum curve change value with a preset pressure change threshold. When the maximum curve change value is greater than the preset pressure change threshold, it is determined that the sulfur hexafluoride circuit breaker has abnormal discharge. Specifically, the maximum slope value is compared with the preset slope threshold, and the maximum amplitude change value is compared with the preset amplitude value change threshold. When the maximum slope value is greater than the preset slope threshold or the maximum amplitude change value is greater than the preset amplitude value change threshold, it is determined that the sulfur hexafluoride circuit breaker has abnormal discharge.

[0096] like Figure 3 As shown, the method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in this embodiment specifically includes the following steps:

[0097] S301, receiving the gas pressure data sequence of the sulfur hexafluoride circuit breaker collected and uploaded in real time by the sulfur hexafluoride density relay.

[0098] S302. Draw a gas pressure-time curve of the sulfur hexafluoride circuit breaker according to the gas pressure data sequence.

[0099] S303: Obtain the symbol status of the data communication mode flag at the current moment.

[0100] Among them, the symbol state is used to indicate the communication mode for data communication with the sulfur hexafluoride density relay, and the communication mode includes a first rate communication mode and a second rate communication mode. The second rate communication mode is the communication mode adopted by the sulfur hexafluoride density relay to upload the gas pressure data sequence under the target condition, and the target condition is that the difference between the gas pressure data collected this time and the gas pressure data collected last time by the sulfur hexafluoride density relay is greater than a preset threshold. The first rate communication mode is the communication mode adopted by the sulfur hexafluoride density relay to upload the gas pressure data sequence under conditions other than the target condition, and the communication rate under the first rate communication mode is less than the communication rate under the second rate communication mode.

[0101] S304. Determine a communication mode for performing data communication with the sulfur hexafluoride density relay at the current moment according to the symbol state.

[0102] S305: When it is determined that the communication mode is the second rate communication mode, calculate the maximum slope value and the maximum amplitude change value of the gas pressure time curve in the time period of the second rate communication mode.

[0103] Optionally, the gas pressure-time curve of the time period in which the second rate communication mode is located is divided into multiple intervals according to the sampling intervals of each continuous target number, and the maximum amplitude value and the minimum amplitude value of each interval are obtained, and the derivative of the difference between the maximum amplitude value and the minimum amplitude value of the interval with respect to time is used as the slope value of the interval, and the maximum value of the slope values ​​of all intervals is used as the maximum slope value of the gas pressure-time curve of the time period in which the second rate communication mode is located.

[0104] Optionally, the maximum amplitude value and the minimum amplitude value on the gas pressure time curve in the time period of the second rate communication mode are obtained, and the difference between the maximum amplitude value and the minimum amplitude value is used as the maximum amplitude change value of the gas pressure time curve in the time period of the second rate communication mode.

[0105] It can be understood that the slope of a certain point on the curve represents the rate of change of the curve at that point, and the maximum slope value of the gas pressure time curve in the period of the second rate communication mode represents the maximum rate of change of the gas pressure in the sulfur hexafluoride circuit breaker during the sudden increase stage. The maximum amplitude change value of the gas pressure time curve in the period of the second rate communication mode represents the maximum change amount of the gas pressure in the sulfur hexafluoride circuit breaker during the sudden increase stage.

[0106] S306. Compare the maximum slope value with the preset slope threshold, and compare the maximum amplitude change value with the preset amplitude value change threshold. When the maximum slope value is greater than the preset slope threshold or the maximum amplitude change value is greater than the preset amplitude value change threshold, it is determined that abnormal discharge exists in the sulfur hexafluoride circuit breaker.

[0107] It can be understood that the embodiment of the present invention is to monitor the sudden increase in gas pressure caused by the sulfur hexafluoride circuit breaker during arc discharge, and then determine whether the sulfur hexafluoride circuit breaker has abnormal discharge. Therefore, the maximum change rate and the maximum change amount of the gas pressure in the sulfur hexafluoride circuit breaker during the sudden increase stage can be compared with the corresponding threshold values, so as to serve as a basis for determining whether the sulfur hexafluoride circuit breaker has abnormal discharge.

[0108] Exemplarily, when the maximum slope value exceeds 10 kPa / s or the maximum amplitude change value exceeds 10 kPa, it is determined that the sulfur hexafluoride circuit breaker has abnormal discharge.

[0109] The embodiment of the present invention receives the gas pressure data sequence of the sulfur hexafluoride circuit breaker collected and uploaded in real time by the sulfur hexafluoride density relay, and draws the gas pressure time curve of the sulfur hexafluoride circuit breaker according to the gas pressure data sequence, and then calculates the maximum slope value and the maximum amplitude change value of the gas pressure time curve in the time period of the second rate communication mode when the communication mode is determined to be the second rate communication mode, and compares the maximum slope value with the preset slope threshold, and compares the maximum amplitude change value with the preset amplitude value change threshold, and when the maximum slope value is greater than the preset slope threshold or the maximum amplitude change value is greater than the preset amplitude value change threshold, it is determined that the sulfur hexafluoride circuit breaker has abnormal discharge. Therefore, by setting the corresponding diagnostic strategy and threshold, the pressure mutation caused by abnormal discharge in the sulfur hexafluoride circuit breaker can be monitored in real time, and the operation and maintenance personnel can be reminded in time to ensure the safe operation of the electrical equipment, and at the same time, the problem that the mechanical density relay cannot monitor the abnormal discharge event inside the circuit breaker is solved.

[0110] Embodiment 4

[0111] Figure 4 A flow chart of a method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in Embodiment 4 of the present invention is provided. This embodiment can be applied to determine whether abnormal discharge occurs in a sulfur hexafluoride circuit breaker by monitoring the sudden increase in gas pressure during arc discharge in the sulfur hexafluoride circuit breaker. The method can be performed by a sulfur hexafluoride density relay, which is implemented by hardware and / or software and is generally integrated in a sulfur hexafluoride circuit breaker abnormal discharge identification system that applies the sulfur hexafluoride circuit breaker abnormal discharge identification method.

[0112] like Figure 4 As shown, the method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in this embodiment specifically includes the following steps:

[0113] S401. Perform data collection this time according to the sampling frequency determined after the gas pressure data in the sulfur hexafluoride circuit breaker was collected last time to form a gas pressure data sequence.

[0114] In this embodiment, after the sulfur hexafluoride density relay collects gas in the sulfur hexafluoride circuit breaker, the collected data can be preprocessed to form a gas pressure data sequence, which is a time series data sequence.

[0115] S402: Obtain the difference between the gas pressure data collected this time and the gas pressure data collected last time.

[0116] It can be understood that by obtaining the difference between the gas pressure data collected this time and the gas pressure data collected last time, it can be determined whether the gas pressure in the sulfur hexafluoride circuit breaker suddenly increases.

[0117] S403: Determine the sampling frequency of the next data collection and the communication mode adopted when uploading the gas pressure data to the background server this time according to the difference and the preset threshold.

[0118] It is understandable that the higher the data sampling frequency, the more accurately the continuity of the gas pressure change can be presented, and the more completely the changing process of the gas pressure can be recorded. The embodiment of the present invention focuses on monitoring the sudden increase in gas pressure during arc discharge in the sulfur hexafluoride circuit breaker. Therefore, when the sulfur hexafluoride density relay samples the gas pressure data in the sulfur hexafluoride circuit breaker, it can allocate the sampling frequency in stages. For example, when a sudden increase in gas pressure is detected in the sulfur hexafluoride circuit breaker, a higher sampling frequency is used, and a lower sampling frequency is used in other cases. In this way, the transient process of the sudden increase in gas pressure can be better recorded and presented. Accordingly, in the stage of sudden increase in gas pressure, the collected gas pressure data can also be uploaded using a communication mode with a higher transmission rate, while in other cases, a communication mode with a lower transmission rate is used to upload.

[0119] S404. Upload the gas pressure data sequence to the background server according to the communication mode, so that the background server determines whether there is abnormal discharge in the sulfur hexafluoride circuit breaker based on the communication mode and the gas pressure data sequence.

[0120] It can be understood that the sulfur hexafluoride density relay end mainly completes the collection of gas pressure data in the sulfur hexafluoride circuit breaker and performs some preprocessing to form a gas pressure data sequence. In addition, the sulfur hexafluoride density relay monitors the difference between two adjacent gas pressure data collections and compares it with the preset threshold. When it exceeds the preset threshold, it immediately switches to a higher sampling frequency and correspondingly switches to a higher transmission rate communication mode to upload the collected gas pressure data.

[0121] The embodiment of the present invention performs data collection this time according to the sampling frequency determined after the gas pressure data in the sulfur hexafluoride circuit breaker was collected last time, forms a gas pressure data sequence, obtains the difference between the gas pressure data collected this time and the gas pressure data collected last time, determines the sampling frequency of the next data collection and the communication mode adopted when uploading the gas pressure data to the background server this time according to the difference and the preset threshold, and uploads the gas pressure data sequence to the background server according to the communication mode, so that the background server can determine whether there is abnormal discharge in the sulfur hexafluoride circuit breaker based on the communication mode and the gas pressure data sequence. As a result, it is realized to determine whether abnormal discharge occurs in the sulfur hexafluoride circuit breaker by monitoring the sudden increase of gas pressure during arc discharge in the sulfur hexafluoride circuit breaker. Thereby, the problem that the mechanical density relay cannot realize the monitoring of abnormal discharge events inside the circuit breaker is solved.

[0122] Embodiment 5

[0123] Figure 5 It is a flow chart of the abnormal discharge identification method of sulfur hexafluoride circuit breaker provided in Example 5 of the present invention, and this embodiment is further optimized on the basis of Example 4. This embodiment concretizes the sampling frequency and the communication mode, specifically: the sampling frequency includes a first sampling frequency and a second sampling frequency, and the communication mode includes a first rate communication mode and a second rate communication mode, wherein the first sampling frequency is less than the second sampling frequency, and the communication rate in the first rate communication mode is less than the communication rate in the second rate communication mode.

[0124] Furthermore, this embodiment specifies the method of determining the sampling frequency of the next data collection and the communication mode to be adopted when uploading the gas pressure data to the background server this time based on the difference and the preset threshold as follows: comparing the difference with the preset threshold, and when the difference is less than the preset threshold, determining the sampling frequency to be the first sampling frequency, and determining the communication mode to be the first rate communication mode; when the difference is greater than the preset threshold, determining the sampling frequency to be the second sampling frequency, and determining the communication mode to be the second rate communication mode.

[0125] like Figure 5 As shown, the method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in this embodiment specifically includes the following steps:

[0126] S501. Perform data collection this time according to the sampling frequency determined after the gas pressure data in the sulfur hexafluoride circuit breaker was collected last time to form a gas pressure data sequence.

[0127] S502: Obtain the difference between the gas pressure data collected this time and the gas pressure data collected last time.

[0128] S503: Compare the difference with the preset threshold.

[0129] S504: When the difference is less than the preset threshold, determine the sampling frequency as the first sampling frequency, and determine the communication mode as the first rate communication mode.

[0130] S505: When the difference is greater than or equal to the preset threshold, determine that the sampling frequency is a second sampling frequency, and determine that the communication mode is a second rate communication mode.

[0131] S506. Upload the gas pressure data sequence to the background server according to the communication mode, so that the background server determines whether there is abnormal discharge in the sulfur hexafluoride circuit breaker based on the communication mode and the gas pressure data sequence.

[0132] The embodiment of the present invention obtains the difference between the gas pressure data collected this time and the gas pressure data collected last time. When the difference is less than the preset threshold, the sampling frequency is determined to be the first sampling frequency, and the communication mode is determined to be the first rate communication mode. When the difference is greater than or equal to the preset threshold, the sampling frequency is determined to be the second sampling frequency, and the communication mode is determined to be the second rate communication mode. The gas pressure data sequence is uploaded to the background server according to the determined communication mode, so that the background server can determine whether there is abnormal discharge in the sulfur hexafluoride circuit breaker based on the communication mode and the gas pressure data sequence. In this way, it is realized to determine whether abnormal discharge occurs in the sulfur hexafluoride circuit breaker by monitoring the sudden increase of gas pressure during arc discharge in the sulfur hexafluoride circuit breaker. Thereby, the problem that the mechanical density relay cannot realize the monitoring of abnormal discharge events inside the circuit breaker is solved.

[0133] Embodiment 6

[0134] Figure 6 This is a schematic diagram of the structure of a sulfur hexafluoride circuit breaker abnormal discharge identification device provided in Embodiment 6 of the present invention. This embodiment can be used to determine whether abnormal discharge occurs in a sulfur hexafluoride circuit breaker by monitoring the sudden increase in gas pressure during arc discharge in the sulfur hexafluoride circuit breaker. The sulfur hexafluoride circuit breaker abnormal discharge identification device is implemented by hardware and / or software, and specifically includes: a data receiving module 601, a curve drawing module 602, a maximum value acquisition module 603, and an abnormality determination module 604. Among them,

[0135] The data receiving module 601 is used to receive the gas pressure data sequence of the sulfur hexafluoride circuit breaker collected and uploaded in real time by the sulfur hexafluoride density relay;

[0136] A curve drawing module 602, used for drawing a gas pressure time curve of the sulfur hexafluoride circuit breaker according to the gas pressure data sequence;

[0137] A maximum value acquisition module 603 is used to determine a communication mode for data communication with the sulfur hexafluoride density relay at a current moment, and to acquire a maximum value of the curve change of the gas pressure time curve based on the communication mode;

[0138] The abnormality determination module 604 is used to compare the maximum value of the curve change with a preset pressure change threshold, and when the maximum value of the curve change is greater than the preset pressure change threshold, determine that the sulfur hexafluoride circuit breaker has abnormal discharge.

[0139] On the basis of the above embodiments, the device for identifying abnormal discharge of a sulfur hexafluoride circuit breaker may further include:

[0140] A state acquisition module is used to obtain the symbol state of the data communication mode flag at the current moment before determining the communication mode for data communication with the sulfur hexafluoride density relay at the current moment, wherein the symbol state is used to indicate the communication mode for data communication with the sulfur hexafluoride density relay, and the communication mode includes a first rate communication mode and a second rate communication mode.

[0141] Based on the above embodiments, the maximum value acquisition module 603 includes:

[0142] a mode determination unit, configured to determine a communication mode for data communication with the sulfur hexafluoride density relay at a current moment according to the symbol state;

[0143] A maximum value acquisition unit is used to acquire a maximum value of the curve change of the gas pressure time curve when it is determined that the communication mode is the second rate communication mode.

[0144] Optionally, the curve change maximum value includes the maximum slope value and the maximum amplitude change value of the gas pressure-time curve.

[0145] Based on the above embodiments, the maximum value obtaining unit includes:

[0146] The first calculation subunit is used to calculate the maximum slope value and the maximum amplitude change value of the gas pressure time curve in the time period of the second rate communication mode.

[0147] Optionally, the preset pressure change threshold includes: a preset slope threshold and a preset amplitude value change threshold.

[0148] Based on the above embodiments, the abnormality identification module 604 includes:

[0149] The maximum slope value is compared with the preset slope threshold, and the maximum amplitude change value is compared with the preset amplitude value change threshold. When the maximum slope value is greater than the preset slope threshold or the maximum amplitude change value is greater than the preset amplitude value change threshold, it is determined that abnormal discharge exists in the sulfur hexafluoride circuit breaker.

[0150] The device for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in the embodiment of the present invention can execute the method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0151] Embodiment 7

[0152] Figure 7 This is a schematic diagram of the structure of a sulfur hexafluoride circuit breaker abnormal discharge identification device provided in Embodiment 7 of the present invention. This embodiment can be used to determine whether abnormal discharge occurs in a sulfur hexafluoride circuit breaker by monitoring the sudden increase in gas pressure during arc discharge in the sulfur hexafluoride circuit breaker. The sulfur hexafluoride circuit breaker abnormal discharge identification device is implemented by hardware and / or software, and specifically includes: a data acquisition module 701, a difference acquisition module 702, a first determination module 703, and a data upload module 704. Among them,

[0153] The data acquisition module 701 is used to perform data acquisition according to the sampling frequency determined after the gas pressure data in the sulfur hexafluoride circuit breaker was acquired last time, so as to form a gas pressure data sequence;

[0154] The difference acquisition module 702 is used to acquire the difference between the gas pressure data collected this time and the gas pressure data collected last time;

[0155] The first determination module 703 is used to determine the sampling frequency of the next data collection and the communication mode adopted when uploading the gas pressure data to the background server this time according to the difference and the preset threshold;

[0156] The data uploading module 704 is used to upload the gas pressure data sequence to the background server according to the communication mode, so that the background server can determine whether there is abnormal discharge in the sulfur hexafluoride circuit breaker based on the communication mode and the gas pressure data sequence.

[0157] Optionally, the sampling frequency includes a first sampling frequency and a second sampling frequency, and the communication mode includes a first rate communication mode and a second rate communication mode, wherein the first sampling frequency is less than the second sampling frequency, and the communication rate in the first rate communication mode is less than the communication rate in the second rate communication mode.

[0158] Based on the above embodiments, the first determining module 703 includes:

[0159] A difference comparison unit, used for comparing the difference with the preset threshold;

[0160] A first determining unit, configured to determine, when the difference is less than the preset threshold, that the sampling frequency is a first sampling frequency, and that the communication mode is a first rate communication mode;

[0161] The second determining unit is used to determine that the sampling frequency is a second sampling frequency and the communication mode is a second rate communication mode when the difference is greater than or equal to the preset threshold.

[0162] The device for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in the embodiment of the present invention can execute the method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0163] Embodiment 8

[0164] Figure 8 : is a structural diagram of a sulfur hexafluoride circuit breaker abnormal discharge identification system provided in Embodiment 8 of the present invention, such as Figure 8 As shown, the sulfur hexafluoride circuit breaker abnormal discharge identification system includes:

[0165] A sulfur hexafluoride density relay 80, a backend server 81 and a memory 82, wherein the memory 82 is connected to the sulfur hexafluoride density relay 80 and the backend server 81 respectively, the sulfur hexafluoride density relay 80 includes a pressure sensor 83, a control module 84, and a communication module 85, the control module 84 is connected to the pressure sensor 83 and the communication module 85 respectively, the sulfur hexafluoride density relay 80 is connected to the backend server 81 through the communication module 85, and the sulfur hexafluoride density relay 80 is installed on a pipeline connected to the gas chamber of the sulfur hexafluoride circuit breaker to be monitored;

[0166] The pressure sensor 83 is used to collect gas pressure data in the sulfur hexafluoride circuit breaker according to the sampling frequency determined by the control module 84; the communication module 85 is used to upload the gas pressure data collected by the pressure sensor 83 to the background server 81 according to the communication mode determined by the pressure sensor 83; the control module 84 is used to determine the sampling frequency of the pressure sensor 83 and the communication mode of the communication module 85 according to the gas pressure data collected by the pressure sensor 83; the background server 81 is used to determine whether there is abnormal discharge in the sulfur hexafluoride circuit breaker according to the gas pressure data and the communication mode.

[0167] The memory 82, as a computer-readable storage medium, can be used to store software programs, computer executable programs and modules, such as the program instructions / modules corresponding to the abnormal discharge identification method of the sulfur hexafluoride circuit breaker in the embodiment of the present invention (for example, the data receiving module 601, the curve drawing module 602, the maximum value acquisition module 603, and the abnormality discrimination module 604 in the abnormal discharge identification device of the sulfur hexafluoride circuit breaker). The backend server 81 executes the corresponding various functional applications and data processing by running the software programs, instructions and modules stored in the memory 82, that is, realizing the above-mentioned abnormal discharge identification method of the sulfur hexafluoride circuit breaker.

[0168] The memory 82 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the terminal, etc. In addition, the memory 82 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices. In some examples, the memory 82 may further include a memory remotely arranged relative to the sulfur hexafluoride density relay 80 and the background server 81, and these remote memories may be connected to the device / terminal / server via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0169] For example, Fig. 9 This is a schematic diagram of the application of the abnormal discharge identification system of sulfur hexafluoride circuit breaker provided in the eighth embodiment of the present invention. Fig. 9 As shown, the sulfur hexafluoride circuit breaker 90 is provided with a pipe 92 for installing a sulfur hexafluoride density relay 91. The sulfur hexafluoride density relay 91 is installed on the pipe 92 connected to the gas chamber of the sulfur hexafluoride circuit breaker 90. The sulfur hexafluoride density relay 91 measures the density of the gas in the gas chamber of the sulfur hexafluoride circuit breaker 90 through the internal pressure sensor 93 and the temperature sensor 94. In this way, the conventional gas density measurement of the sulfur hexafluoride circuit breaker 90 can be realized.

[0170] For monitoring of sudden increase of gas pressure in sulfur hexafluoride circuit breaker 90, control module 95 controls pressure sensor 93 to sample at a certain frequency (e.g., 10 Hz). When the difference between the currently sampled pressure and the last sampled pressure is greater than a set threshold (e.g., 10 kPa), pressure sensor 93 is immediately controlled to switch to high-frequency sampling mode (e.g., the sampling frequency is increased to 50 Hz) until the gas pressure returns to a stable state, and then the sampling frequency is restored to 10 Hz, and communication module 96 is controlled to switch to high-speed communication mode to upload data to background server 97 in real time. The backend server 97 records and displays the gas pressure time curve within the last 5 seconds until the gas pressure returns to a stable state. When the gas pressure suddenly increases, the backend server 97 calculates and analyzes the sudden increase in gas pressure, and calculates the maximum slope value, maximum amplitude change value and duration of the sudden increase in gas pressure. When the maximum slope value exceeds 10kPa / s or the maximum amplitude change value exceeds 10kPa, it is determined to be a dangerous signal, and the danger level is determined according to the duration of the sudden increase in gas pressure and notified to the management personnel. The slope threshold, amplitude change threshold, and danger level corresponding to the duration can be optimized and adjusted according to empirical data.

[0171] The technical principles of the embodiments of the present invention are described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the embodiments of the present invention and cannot be interpreted in any way as limiting the protection scope of the embodiments of the present invention. Based on the explanations herein, those skilled in the art can think of other specific implementation methods of the embodiments of the present invention without creative work, and these methods will fall within the protection scope of the embodiments of the present invention.

Claims

1. A method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker, characterized in that: include: Receive the gas pressure data sequence of the sulfur hexafluoride circuit breaker collected and uploaded in real time by the sulfur hexafluoride density relay; A gas pressure-time curve of the sulfur hexafluoride circuit breaker is obtained by drawing the gas pressure data sequence; Determine a communication mode for data communication with the sulfur hexafluoride density relay at a current moment, and obtain a maximum value of a curve change of the gas pressure-time curve based on the communication mode; The maximum value of the curve change is compared with a preset pressure change threshold, and when the maximum value of the curve change is greater than the preset pressure change threshold, it is determined that abnormal discharge exists in the sulfur hexafluoride circuit breaker.

2. The method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker according to claim 1, characterized in that: Before determining the communication mode for data communication with the sulfur hexafluoride density relay at the current moment, the method further includes: Obtain the symbol state of the data communication mode flag at the current moment, wherein the symbol state is used to indicate the communication mode for data communication with the sulfur hexafluoride density relay at the current moment, the communication mode including a first rate communication mode and a second rate communication mode, the second rate communication mode being the communication mode adopted by the sulfur hexafluoride density relay to upload a gas pressure data sequence under target conditions, the target condition being that the difference between the gas pressure data collected this time and the gas pressure data collected last time by the sulfur hexafluoride density relay is greater than a preset threshold, and the communication rate under the first rate communication mode is less than the communication rate under the second rate communication mode.

3. The method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker according to claim 2, characterized in that: The determining of the communication mode for data communication with the sulfur hexafluoride density relay at the current moment, and obtaining the maximum value of the curve change of the gas pressure time curve based on the communication mode, includes: Determining a communication mode for data communication with the sulfur hexafluoride density relay at the current moment according to the symbol state; When it is determined that the communication mode is the second rate communication mode, a maximum curve change value of the gas pressure time curve is obtained.

4. The method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker according to claim 3, characterized in that: The curve change maximum value includes the maximum slope value and the maximum amplitude change value of the gas pressure time curve; The step of obtaining a maximum curve change value of the gas pressure-time curve comprises: The maximum slope value and the maximum amplitude change value of the gas pressure time curve in the time period of the second rate communication mode are calculated.

5. The method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker according to claim 4, characterized in that: The preset pressure change threshold includes: a preset slope threshold and a preset amplitude value change threshold; The step of comparing the maximum value of the curve change with a preset pressure change threshold, and determining that the sulfur hexafluoride circuit breaker has abnormal discharge when the maximum value of the curve change is greater than the preset pressure change threshold, includes: The maximum slope value is compared with the preset slope threshold, and the maximum amplitude change value is compared with the preset amplitude value change threshold. When the maximum slope value is greater than the preset slope threshold or the maximum amplitude change value is greater than the preset amplitude value change threshold, it is determined that abnormal discharge exists in the sulfur hexafluoride circuit breaker.

6. A method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker, characterized in that: include: Performing this data collection according to the sampling frequency determined after the gas pressure data in the sulfur hexafluoride circuit breaker was collected last time to form a gas pressure data sequence; Obtain the difference between the gas pressure data collected this time and the gas pressure data collected last time; Determine the sampling frequency of the next data collection and the communication mode adopted when uploading the gas pressure data to the background server this time according to the difference and the preset threshold; The gas pressure data sequence is uploaded to the background server according to the communication mode, so that the background server determines whether there is abnormal discharge in the sulfur hexafluoride circuit breaker based on the communication mode and the gas pressure data sequence.

7. The method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker according to claim 6, characterized in that: The sampling frequency includes a first sampling frequency and a second sampling frequency, and the communication mode includes a first rate communication mode and a second rate communication mode, wherein the first sampling frequency is less than the second sampling frequency, and the communication rate in the first rate communication mode is less than the communication rate in the second rate communication mode; Correspondingly, the method of determining the sampling frequency of the next data collection and the communication mode adopted when uploading the gas pressure data to the background server this time according to the difference and the preset threshold value includes: comparing the difference with the preset threshold; When the difference is less than the preset threshold, determining the sampling frequency to be the first sampling frequency, and determining the communication mode to be the first rate communication mode; When the difference is greater than or equal to the preset threshold, the sampling frequency is determined to be a second sampling frequency, and the communication mode is determined to be a second rate communication mode.

8. A device for identifying abnormal discharge of a sulfur hexafluoride circuit breaker, characterized in that: include: A data receiving module, used for receiving the gas pressure data sequence of the sulfur hexafluoride circuit breaker collected and uploaded in real time by the sulfur hexafluoride density relay; A curve drawing module, used for drawing a gas pressure time curve of the sulfur hexafluoride circuit breaker according to the gas pressure data sequence; A maximum value acquisition module, used to determine a communication mode for data communication with the sulfur hexafluoride density relay at a current moment, and to acquire a maximum value of a curve change of the gas pressure-time curve based on the communication mode; The abnormality determination module is used to compare the maximum value of the curve change with a preset pressure change threshold, and when the maximum value of the curve change is greater than the preset pressure change threshold, determine that the sulfur hexafluoride circuit breaker has abnormal discharge.

9. A device for identifying abnormal discharge of a sulfur hexafluoride circuit breaker, characterized in that: include: A data acquisition module, used to perform data acquisition this time according to the sampling frequency determined after the gas pressure data in the sulfur hexafluoride circuit breaker was acquired last time, so as to form a gas pressure data sequence; A difference acquisition module is used to obtain the difference between the gas pressure data collected this time and the gas pressure data collected last time; A first determination module, used to determine the sampling frequency of the next data collection and the communication mode adopted when uploading the gas pressure data to the background server this time according to the difference and the preset threshold; A data uploading module is used to upload the gas pressure data sequence to the background server according to the communication mode, so that the background server can determine whether there is abnormal discharge in the sulfur hexafluoride circuit breaker based on the communication mode and the gas pressure data sequence.

10. A sulfur hexafluoride circuit breaker abnormal discharge identification system, characterized in that: include: A sulfur hexafluoride density relay, a background server and a memory, wherein the memory is connected to the sulfur hexafluoride density relay and the background server respectively, the sulfur hexafluoride density relay comprises a pressure sensor, a control module and a communication module, the control module is connected to the pressure sensor and the communication module respectively, the sulfur hexafluoride density relay is connected to the background server through the communication module, and the sulfur hexafluoride density relay is installed on a pipeline connected to the gas chamber of the sulfur hexafluoride circuit breaker to be monitored; The pressure sensor is used to collect gas pressure data in the sulfur hexafluoride circuit breaker according to the sampling frequency determined by the control module; The communication module is used to upload the gas pressure data collected by the pressure sensor to the background server according to the communication mode determined by the pressure sensor; The control module is used to determine the sampling frequency of the pressure sensor and the communication mode of the communication module according to the gas pressure data collected by the pressure sensor; The backend server is used to determine whether the sulfur hexafluoride circuit breaker has abnormal discharge according to the gas pressure data and the communication mode; The memory is used to store one or more programs; The one or more programs are executed by the background server or the sulfur hexafluoride density relay, so that the background server implements the method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker as described in any one of claims 1-5, and the sulfur hexafluoride density relay implements the method for identifying abnormal discharge of a sulfur hexafluoride circuit breaker as described in any one of claims 6-7.

Images