A low-voltage switch trip monitoring system and method for a substation

Abstract

The present invention belongs to the field of electric power monitoring technology, specifically, a substation low-voltage switch trip monitoring system and method thereof, comprising a data acquisition module and a data processing module, the data acquisition module is used to collect the operation data of the substation low-voltage switch in real time, and the data processing module is used to perform trip protection coefficient analysis on the operation data of the substation low-voltage switch to determine whether trip prevention measures need to be implemented; if the trip protection coefficient FT of the substation low-voltage switch is greater than a preset trip protection coefficient threshold FTY, it is determined that the corresponding substation low-voltage switch has a trip risk; the trip protection coefficient FT of the substation low-voltage switch is obtained by combining the deviation coefficient PS and the substation low-voltage switch operation coefficient YX, which can take into account current, voltage and temperature factors, and also combines the time change trend factor of the substation low-voltage switch operation coefficient YX, which can more accurately determine whether the substation low-voltage switch has a trip risk to avoid false alarms.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power monitoring, in particular to a low-voltage switch trip monitoring system and method for an area. Background Art

[0002] In the power system, the low-voltage switch in the substation is one of the key equipment for power transmission. However, due to various reasons, such as equipment aging, overload, short circuit, etc., the low-voltage switch may trip, bringing risks to the safe operation of the power network.

[0003] Most of the existing low-voltage switch monitoring methods in substations use sensors to collect the voltage, current and temperature of the substation power supply lines. When the data exceeds the preset value at a certain moment, the alarm device will be directly triggered to alarm. It is impossible to intelligently judge whether the alarm is caused by current fluctuations or voltage fluctuations at this moment as time changes. There are false alarms, and the development process of tripping cannot be predicted. It also affects the range warning, and it is easy to cause serious damage when an unexpected trip occurs.

[0004] To this end, the present invention provides a low-voltage switch trip monitoring system and method for an area. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a low-voltage switch trip monitoring system in a substation described in the present invention is characterized by comprising a data acquisition module, a data processing module, a trip monitoring module and a trip process evolution module;

[0007] Data acquisition module: used to collect the operation data of the low-voltage switch in the substation in real time, and transmit the collected operation data to the data processing module;

[0008] Data processing module: used to analyze the tripping protection factor of the operation data of the low-voltage switch in the substation area to determine whether tripping prevention measures need to be implemented; if the tripping protection factor FT of the low-voltage switch in the substation area is greater than the preset tripping protection factor threshold FTY, it is determined that the corresponding low-voltage switch in the substation area has a tripping risk and generates a tripping prevention signal;

[0009] Tripping monitoring module: used to monitor the tripping process of the low-voltage switch in the substation with tripping risk, and send the monitoring data to the tripping process evolution module;

[0010] Tripping process evolution module: used to input the monitoring data obtained by the tripping monitoring module into the evolution model, perform the evolution of the switch tripping process, establish the switch tripping process development coordinate axis, predict the time and nodes, obtain the scope of tripping damage and transmit it to the correction module;

[0011] Correction module: used to correct the evolved tripping damage range and send the corrected tripping damage range to the corresponding power supply center;

[0012] Substation power supply center: used to issue early warnings to various local areas in the substation based on the evolution results and the scope of tripping damage, to ensure that preventive measures are taken before the substation low-voltage switch trips.

[0013] Furthermore, the operating data includes a current value IS, a voltage value US, and a temperature value WS.

[0014] Further, the current value IS is measured by a current sensor, the voltage value US is measured by a voltage sensor, and the temperature value WS is measured by a temperature sensor.

[0015] Furthermore, the data processing module is used to analyze the trip protection factor of the operation data of the low-voltage switch in the substation area, specifically:

[0016] Obtain the standard environmental operating parameters of the substation low-voltage switch, and use the corresponding rated current value IE, voltage value UE, and ambient temperature value WE in the standard environmental operating parameters. According to the actual operating data of the substation low-voltage switch, the formula YX=(IS-IE)×a1+(US-UE)×a2+(WS-WE)×a3 is used to obtain the substation low-voltage switch operating coefficient YX, where a1, a2, and a3 are preset proportional factors, and a1+a2+a3=1, a1>a3>a2. According to the time change trend of the substation low-voltage switch operating coefficient YX, the tripping protection coefficient FT of the substation low-voltage switch is analyzed.

[0017] Furthermore, the tripping protection factor FT of the low-voltage switch in the substation is analyzed according to the time variation trend of the operation coefficient YX of the substation, specifically:

[0018] Establish a curve chart of the change of the low-voltage switch operation coefficient YX over time; compare the low-voltage switch operation coefficient YX of the substation at each moment in the cycle with the preset operation coefficient threshold YB; if the low-voltage switch operation coefficient YX of the substation is greater than the preset operation coefficient threshold YB, obtain the difference between the low-voltage switch operation coefficient YX of the substation and the preset operation coefficient threshold YB, and mark the difference as the deviation value PL;

[0019] All deviation values ​​PL within the period are integrated with respect to time and summed to obtain the deviation coefficient PS; the tripping protection coefficient FT of the low-voltage switch in the substation is calculated using the formula FT=YX×b1+PL×b2, where b1 and b2 are coefficient factors.

[0020] Furthermore, a curve chart showing the change of the low-voltage switch operation coefficient YX over time is established, specifically:

[0021] Within a preset period, several collection moments are set, and the operation coefficient YX of the substation low-voltage switch at adjacent moments is connected by a straight line to form a curve graph of the change of the operation coefficient YX of the substation low-voltage switch over time.

[0022] Furthermore, the tripping process evolution module is used to input the monitoring data into the evolution model to perform the evolution of the switch tripping development process, specifically:

[0023] Establish a neural network model, and retrieve the development process and historical monitoring data of the tripped low-voltage switch in the substation through the Internet. The historical monitoring data includes environmental operating parameters during the tripping process, the scope of tripping damage, and emergency measures;

[0024] The development process of the tripping of the low-voltage switch in the substation and the corresponding historical data are marked as a training set, where the historical data is used as input data and the development process of the corresponding low-voltage switch in the substation that has tripped is used as output data. The neural network model is trained using the training set, and the trained neural network model is marked as an evolutionary model.

[0025] Furthermore, the correction module is used to correct the trip damage range obtained by evolution, specifically:

[0026] After the first evolution is completed, the areas where the actual tripping damage range exceeds the evolved tripping damage range are screened out, and then inversion is performed. The inversion results are compared with the actual results monitored by the tripping monitoring module, and the similar historical data of low-voltage switch tripping in the substation on the Internet are referred to. The cause is analyzed, the evolutionary model is corrected and evolved again until the actual tripping damage range is consistent with the evolved tripping damage range.

[0027] Furthermore, if the tripping protection factor FT of the substation low-voltage switch is less than or equal to the preset tripping protection factor threshold FTY, it is determined that the corresponding substation low-voltage switch has no tripping risk and no operation is required.

[0028] A method for monitoring the tripping of a low-voltage switch in a substation, comprising the following steps:

[0029] Step 1: Collect the operation data of the low-voltage switch in the substation in real time, analyze the tripping protection factor of the operation data of the low-voltage switch in the substation, and determine whether tripping prevention measures need to be implemented;

[0030] If the tripping protection factor FT of the low-voltage switch in the substation is greater than the preset tripping protection factor threshold FTY, it is determined that the corresponding low-voltage switch in the substation has a tripping risk, and a tripping prevention signal is generated;

[0031] Step 2: Monitor the tripping process of the low-voltage switch in the substation with tripping risk, input the monitoring data into the evolution model, evolve the switch tripping process, establish the switch tripping process development coordinate axis, predict the time and node, and obtain the scope of tripping damage;

[0032] Step 3: Correct the evolved tripping damage range, and send the corrected tripping damage range to the corresponding power supply center;

[0033] Step 4: The power supply center of the substation is used to issue early warnings to various local areas in the substation based on the evolution results and the scope of tripping damage to ensure that preventive measures are taken before the substation low-voltage switch trips.

[0034] The beneficial effects of the present invention are as follows:

[0035] 1. The present invention describes a substation low-voltage switch tripping monitoring system and method. The tripping protection coefficient FT of the substation low-voltage switch is obtained by combining the deviation coefficient PS and the substation low-voltage switch operation coefficient YX. It can take into account current, voltage and temperature factors. At the same time, it also combines the time change trend factor of the substation low-voltage switch operation coefficient YX. It can more accurately judge whether there is a tripping risk of the substation low-voltage switch to avoid false alarms.

[0036] 2. The present invention describes a substation low-voltage switch tripping monitoring system and method, which further monitors the substation low-voltage switch with a tripping risk, and establishes an evolution model in combination with the historical tripping data of the substation low-voltage switch. By inputting the monitored data, the development process of the switch tripping of the substation low-voltage switch can be determined, the time and node of the tripping can be predicted, and the scope of the tripping damage can be obtained. According to the evolution results, the scope of the tripping damage can be used to warn various local areas of the substation to ensure that preventive measures are taken before the substation low-voltage switch trips, thereby reducing damage caused by accidental tripping of the substation low-voltage switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] Figure 1 It is a system flow chart of a low-voltage switch trip monitoring system in a substation of the present invention;

[0039] Figure 2 The present invention is a flow chart of a method for monitoring the tripping of a low-voltage switch in an area. DETAILED DESCRIPTION

[0040] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0041] Embodiment 1

[0042] like Figure 1 to Figure 2 As shown, a low-voltage switch trip monitoring system for a substation according to an embodiment of the present invention includes a data acquisition module, a data processing module, a trip monitoring module, a trip process evolution module, a correction module, and a substation power supply center;

[0043] The data acquisition module is used to collect the operation data of the low-voltage switch in the substation in real time, and transmit the collected operation data to the data processing module;

[0044] Data processing module: used to analyze the tripping protection factor of the operation data of the low-voltage switch in the substation area to determine whether tripping prevention measures need to be implemented; if the tripping protection factor FT of the low-voltage switch in the substation area is greater than the preset tripping protection factor threshold FTY, it is determined that the corresponding low-voltage switch in the substation area has a tripping risk and generates a tripping prevention signal;

[0045] Tripping monitoring module: used to monitor the tripping process of the low-voltage switch in the substation with tripping risk, and send the monitoring data to the tripping process evolution module;

[0046] Tripping process evolution module: used to input the monitoring data obtained by the tripping monitoring module into the evolution model, perform the evolution of the switch tripping process, establish the switch tripping process development coordinate axis, predict the time and nodes, obtain the scope of tripping damage and transmit it to the correction module;

[0047] Correction module: used to correct the evolved tripping damage range and send the corrected tripping damage range to the corresponding power supply center;

[0048] Substation power supply center: used to issue early warnings to various local areas in the substation based on the evolution results and the scope of tripping damage, to ensure that preventive measures are taken before the substation low-voltage switch trips.

[0049] The operating data includes a current value IS, a voltage value US, and a temperature value WS.

[0050] The current value IS is measured by a current sensor, the voltage value US is measured by a voltage sensor, and the temperature value WS is measured by a temperature sensor.

[0051] In one embodiment: by installing a current sensor and a voltage sensor on the substation low-voltage switch line, and installing a temperature sensor inside the substation low-voltage switch, it is possible to obtain the current value IS, voltage value US, and temperature value WS of the substation low-voltage switch in real time when the substation low-voltage switch is working normally, and detect the operating data of the substation low-voltage switch at all times.

[0052] The data processing module is used to analyze the tripping protection factor of the operation data of the low-voltage switch in the substation area, specifically:

[0053] Obtain the standard environmental operating parameters of the substation low-voltage switch, and use the corresponding rated current value IE, voltage value UE, and ambient temperature value WE in the standard environmental operating parameters. According to the actual operating data of the substation low-voltage switch, the formula YX=(IS-IE)×a1+(US-UE)×a2+(WS-WE)×a3 is used to obtain the substation low-voltage switch operating coefficient YX, where a1, a2, and a3 are preset proportional factors, and a1+a2+a3=1, a1>a3>a2. According to the time change trend of the substation low-voltage switch operating coefficient YX, the tripping protection coefficient FT of the substation low-voltage switch is analyzed.

[0054] Specifically, the standard environmental operating parameters of the substation low-voltage switch are standard working data provided by the manufacturer. By subtracting the standard environmental operating parameters of the pressure switch from the actual operating data, the current difference, voltage difference and temperature difference are obtained respectively. Combined with the corresponding preset proportional coefficient, the substation low-voltage switch operating coefficient YX can be obtained. According to the time change trend of the substation low-voltage switch operating coefficient YX, the tripping protection coefficient FT of the substation low-voltage switch is analyzed.

[0055] According to the time variation trend of the low-voltage switch operation coefficient YX in the substation, the tripping protection coefficient FT of the low-voltage switch in the substation is analyzed, specifically:

[0056] Establish a curve chart of the change of the low-voltage switch operation coefficient YX over time; compare the low-voltage switch operation coefficient YX of the substation at each moment in the cycle with the preset operation coefficient threshold YB; if the low-voltage switch operation coefficient YX of the substation is greater than the preset operation coefficient threshold YB, obtain the difference between the low-voltage switch operation coefficient YX of the substation and the preset operation coefficient threshold YB, and mark the difference as the deviation value PL;

[0057] All deviation values ​​PL within the period are integrated with respect to time and summed to obtain the deviation coefficient PS; the tripping protection coefficient FT of the low-voltage switch in the substation is calculated using the formula FT=YX×b1+PL×b2, where b1 and b2 are coefficient factors.

[0058] It can be understood that the tripping protection coefficient FT of the substation low-voltage switch is obtained by combining the deviation coefficient PS and the substation low-voltage switch operating coefficient YX. It can take into account the current, voltage and temperature factors. At the same time, it also combines the time change trend factor of the substation low-voltage switch operating coefficient YX, which can more accurately judge whether there is a tripping risk of the substation low-voltage switch.

[0059] Establish a curve chart of the low-voltage switch operation coefficient YX changing with time, specifically:

[0060] Within a preset period, several collection moments are set, and the operation coefficient YX of the substation low-voltage switch at adjacent moments is connected by a straight line to form a curve graph of the change of the operation coefficient YX of the substation low-voltage switch over time.

[0061] The tripping process evolution module is used to input the monitoring data into the evolution model to perform the evolution of the switch tripping development process, specifically:

[0062] Establish a neural network model, and retrieve the development process and historical monitoring data of the tripped low-voltage switch in the substation through the Internet. The historical monitoring data includes environmental operating parameters during the tripping process, the scope of tripping damage, and emergency measures;

[0063] The development process of the tripping of the low-voltage switch in the substation and the corresponding historical data are marked as a training set, where the historical data is used as input data and the development process of the corresponding low-voltage switch in the substation that has tripped is used as output data. The neural network model is trained using the training set, and the trained neural network model is marked as an evolutionary model.

[0064] The correction module is used to correct the trip damage range obtained by evolution, specifically:

[0065] After the first evolution is completed, the areas where the actual tripping damage range exceeds the evolved tripping damage range are screened out, and then inversion is performed. The inversion results are compared with the actual results monitored by the tripping monitoring module, and the similar historical data of low-voltage switch tripping in the substation on the Internet are referred to. The cause is analyzed, the evolutionary model is corrected and evolved again until the actual tripping damage range is consistent with the evolved tripping damage range.

[0066] In a specific embodiment,

[0067] If the tripping protection factor FT of the substation low-voltage switch is less than or equal to the preset tripping protection factor threshold FTY, it is determined that the corresponding substation low-voltage switch has no tripping risk and no operation is required.

[0068] Embodiment 2

[0069] like Figure 2 As shown in Comparative Example 1, another embodiment of the present invention is:

[0070] A method for monitoring the tripping of a low-voltage switch in an area, comprising:

[0071] Step 1: Collect the operation data of the low-voltage switch in the substation in real time, analyze the tripping protection factor of the operation data of the low-voltage switch in the substation, and determine whether tripping prevention measures need to be implemented;

[0072] If the tripping protection factor FT of the low-voltage switch in the substation is greater than the preset tripping protection factor threshold FTY, it is determined that the corresponding low-voltage switch in the substation has a tripping risk, and a tripping prevention signal is generated;

[0073] Step 2: Monitor the tripping process of the low-voltage switch in the substation with tripping risk, input the monitoring data into the evolution model, evolve the switch tripping process, establish the switch tripping process development coordinate axis, predict the time and node, and obtain the scope of tripping damage;

[0074] Step 3: Correct the evolved tripping damage range, and send the corrected tripping damage range to the corresponding power supply center;

[0075] Step 4: The power supply center of the substation is used to issue early warnings to various local areas in the substation based on the evolution results and the scope of tripping damage to ensure that preventive measures are taken before the substation low-voltage switch trips.

[0076] When the risk of tripping of the low-voltage switch in the substation is predicted, an early warning can be issued to various local areas in the substation on the scope of the tripping damage, allowing each region to remotely open and close the low-voltage switch in advance to eliminate the fault in time and ensure the safe operation of the power network.

[0077] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A low-voltage switch trip monitoring system in an area, characterized in that: It includes a data acquisition module, a data processing module, a tripping monitoring module and a tripping process evolution module; Data acquisition module: used to collect the operation data of the low-voltage switch in the substation in real time, and transmit the collected operation data to the data processing module; Data processing module: used to analyze the tripping protection factor of the operation data of the low-voltage switch in the substation area to determine whether tripping prevention measures need to be implemented; if the tripping protection factor FT of the low-voltage switch in the substation area is greater than the preset tripping protection factor threshold FTY, it is determined that the corresponding low-voltage switch in the substation area has a tripping risk and generates a tripping prevention signal; Tripping monitoring module: used to monitor the tripping process of the low-voltage switch in the substation with tripping risk, and send the monitoring data to the tripping process evolution module; Tripping process evolution module: used to input the monitoring data obtained by the tripping monitoring module into the evolution model, perform the evolution of the switch tripping process, establish the switch tripping process development coordinate axis, predict the time and nodes, obtain the scope of tripping damage and transmit it to the correction module; Correction module: used to correct the evolved tripping damage range and send the corrected tripping damage range to the corresponding power supply center; Substation power supply center: used to issue early warnings to various local areas in the substation according to the evolution results and the scope of tripping damage, so as to ensure that preventive measures are taken before the substation low-voltage switch trips; The data processing module is used to analyze the tripping protection factor of the operation data of the low-voltage switch in the substation area, specifically: Obtain the standard environmental operating parameters of the substation low-voltage switch, and use the corresponding rated current value IE, voltage value UE, and ambient temperature value WE in the standard environmental operating parameters, according to the actual operation data of the substation low-voltage switch, to obtain the substation low-voltage switch operation coefficient YX through the formula YX=(IS-IE)×a1+(US-UE)×a2+(WS-WE)×a3, where a1, a2, and a3 are preset proportional factors, and a1+a2+a3=1, a1>a3>a2, and analyze the trip protection factor FT of the substation low-voltage switch according to the time change trend of the substation low-voltage switch operation coefficient YX; According to the time variation trend of the low-voltage switch operation coefficient YX in the substation, the tripping protection coefficient FT of the low-voltage switch in the substation is analyzed, specifically: Establish a curve chart of the change of the low-voltage switch operation coefficient YX over time in the substation; compare the substation low-voltage switch operation coefficient YX at each moment in the cycle with the preset operation coefficient threshold value YB; If the low-voltage switch operation coefficient YX of the substation is greater than the preset operation coefficient threshold value YB, the difference between the low-voltage switch operation coefficient YX of the substation and the preset operation coefficient threshold value YB is obtained, and the difference is marked as the deviation value PL; All deviation values ​​PL within the cycle are integrated with respect to time and summed to obtain the deviation coefficient PS; The trip protection factor FT of the low-voltage switch in the substation is calculated using the formula FT = YX × b1 + PL × b2, where b1 and b2 are coefficient factors; Establish a curve chart of the low-voltage switch operation coefficient YX changing with time, specifically: In a preset period, several collection moments are set, and the operation coefficients YX of the substation low-voltage switches at adjacent moments are connected by straight lines to form a curve graph of the operation coefficients YX of the substation low-voltage switches changing with time; The tripping process evolution module is used to input the monitoring data into the evolution model to perform the evolution of the switch tripping development process, specifically: Establish a neural network model, and retrieve the development process and historical monitoring data of the tripped low-voltage switch in the substation through the Internet. The historical monitoring data includes environmental operating parameters during the tripping process, the scope of tripping damage, and emergency measures; The development process of the low-voltage switch tripping in the substation area and the corresponding historical data are marked as a training set, wherein the historical data is used as input data, and the development process of the corresponding low-voltage switch tripping in the substation area is used as output data. The neural network model is trained through the training set, and the trained neural network model is marked as an evolution model; The correction module is used to correct the trip damage range obtained by evolution, specifically: After the first evolution is completed, the areas where the actual tripping damage range exceeds the evolved tripping damage range are screened out, and then inversion is performed. The inversion results are compared with the actual results monitored by the tripping monitoring module, and the similar historical data of low-voltage switch tripping in the substation on the Internet are referred to. The cause is analyzed, the evolutionary model is corrected and evolved again until the actual tripping damage range is consistent with the evolved tripping damage range.

2. A low-voltage switch trip monitoring system for a substation according to claim 1, characterized in that: The operating data includes a current value IS, a voltage value US, and a temperature value WS.

3. A low-voltage switch trip monitoring system for a substation according to claim 2, characterized in that: The current value IS is measured by a current sensor, the voltage value US is measured by a voltage sensor, and the temperature value WS is measured by a temperature sensor.

4. A low-voltage switch trip monitoring system for a substation according to claim 1, characterized in that: If the tripping protection factor FT of the substation low-voltage switch is less than or equal to the preset tripping protection factor threshold FTY, it is determined that the corresponding substation low-voltage switch has no tripping risk and no operation is required.

5. A method for monitoring the tripping of a low-voltage switch in an area, characterized in that: The method is performed by the system according to any one of claims 1 to 4, and the method comprises the following steps: Step 1: Collect the operation data of the low-voltage switch in the substation in real time, analyze the tripping protection factor of the operation data of the low-voltage switch in the substation, and determine whether tripping prevention measures need to be implemented; If the tripping protection factor FT of the low-voltage switch in the substation is greater than the preset tripping protection factor threshold FTY, it is determined that the corresponding low-voltage switch in the substation has a tripping risk, and a tripping prevention signal is generated; Step 2: Monitor the tripping process of the low-voltage switch in the substation with tripping risk, input the monitoring data into the evolution model, evolve the switch tripping process, establish the switch tripping process development coordinate axis, predict the time and node, and obtain the scope of tripping damage; Step 3: Correct the evolved tripping damage range, and send the corrected tripping damage range to the corresponding power supply center; Step 4: The power supply center of the substation is used to issue early warnings to various local areas in the substation based on the evolution results and the scope of tripping damage to ensure that preventive measures are taken before the substation low-voltage switch trips.

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