CN112924106A - Online monitoring method, device and system for SF6 gas insulation equipment of transformer substation and storage medium - Google Patents
Online monitoring method, device and system for SF6 gas insulation equipment of transformer substation and storage medium Download PDFInfo
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- CN112924106A CN112924106A CN202110126542.3A CN202110126542A CN112924106A CN 112924106 A CN112924106 A CN 112924106A CN 202110126542 A CN202110126542 A CN 202110126542A CN 112924106 A CN112924106 A CN 112924106A
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- 238000009413 insulation Methods 0.000 title claims abstract description 120
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 111
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- 238000004364 calculation method Methods 0.000 claims description 3
- 229910018503 SF6 Inorganic materials 0.000 description 227
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 227
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- 239000007787 solid Substances 0.000 description 1
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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Abstract
The invention discloses a method, a device and a system for online monitoring of SF6 gas insulation equipment of a transformer substation and a storage medium. After the position information of the pointer of the SF6 gas pressure gauge acquired by the displacement sensor is acquired, the gas pressure in SF6 gas insulation equipment is determined based on the position information, the gas pressure corresponding to the position information acquired at the K +1 th time is subtracted from the gas pressure corresponding to the position information acquired at the K th time to obtain a pressure difference value, when the pressure difference value is smaller than zero, whether gas leakage exists in the SF6 gas insulation equipment is determined based on the change of the gas pressure, and warning information is sent out when the gas leakage exists in the SF6 gas insulation equipment. Through the real-time monitoring of the gas pressure in the SF6 gas insulation equipment, when gas leakage exists in the SF6 gas insulation equipment, workers are prompted to take safety measures in time, and major accidents of a power grid are avoided.
Description
Technical Field
The embodiment of the invention relates to the technical field of equipment monitoring, in particular to an online monitoring method, device and system for SF6 gas insulation equipment of a transformer substation and a storage medium.
Background
In recent years, with the continuous development and maturity of technology, SF6 (sulfur hexafluoride) gas insulation equipment has been widely operated in each newly built substation. SF6 gas insulated equipment is widely used not only in the high voltage and extra high voltage fields, but also in the extra high voltage field. Compared with the conventional outdoor open equipment, the SF6 gas insulation equipment has the advantages of compact structure, small occupied area, high reliability, flexible configuration, strong safety, strong environmental adaptability and small maintenance workload.
At the same time, the use of large quantities of SF6 gas-insulated equipment has also created corresponding difficulties. This type of device, as the name implies, relies on charging the interior of the device with high-pressure SF6 gas to achieve insulation. Therefore, the magnitude of the SF6 gas pressure inside the insulation box directly determines whether the insulation of the equipment is reliable. Obviously, high pressure SF6 gas entails a risk of leakage, while the operating environment of SF6 gas-insulated equipment tends to be relatively harsh, which increases the risk of gas leakage even more.
The SF6 gas pressure is too low, which causes the reduction of the insulation performance and the arc extinguishing capability, and causes a great hidden trouble to the operation reliability of the power grid. However, if the SF6 gas pressure is reduced to close and open the brake, the gas will not be kicked on at once, but will gradually leak, and the quality will be changed due to the amount of the gas. If corresponding measures can be taken at the first time of leakage, various hidden dangers caused by too low SF6 gas pressure value can be avoided. One difficulty in the operation and maintenance of SF6 gas-insulated equipment from the standpoint of actual power transformation operation and maintenance is that slight gas leakage is not easily perceived, and when gas leakage can be clearly detected, the situation becomes complicated and difficult.
Disclosure of Invention
The invention provides an online monitoring method, device and system for SF6 gas insulation equipment of a transformer substation and a storage medium, so that the gas pressure in SF6 gas insulation equipment can be monitored in real time.
In a first aspect, an embodiment of the present invention provides an online monitoring method for a substation SF6 gas insulation device, including:
acquiring position information of an SF6 barometer pointer acquired by a displacement sensor;
determining a gas pressure within the SF6 gas insulated device based on the location information;
subtracting the gas pressure corresponding to the position information obtained at the K +1 th time from the gas pressure corresponding to the position information obtained at the K th time to obtain a pressure difference value;
determining whether there is a gas leakage in the SF6 gas insulated device based on a change in the gas pressure when the pressure difference is less than zero;
and sending out a warning message when the SF6 gas insulation equipment has gas leakage.
Optionally, the displacement sensor is a linear displacement sensor, and obtains the position information of the pointer of the SF6 barometer collected by the displacement sensor, including:
acquiring displacement information of the SF6 barometer pointer acquired by the linear displacement sensor;
and determining the position information of the SF6 barometer pointer based on the displacement information.
Optionally, the displacement sensor is an angular displacement sensor, and the position information of the pointer of the SF6 barometer acquired by the displacement sensor is acquired, including:
acquiring deflection angle information of the SF6 barometer pointer acquired by the angular displacement sensor;
determining position information of the SF6 barometer pointer based on the deflection angle information.
Optionally, determining whether there is a gas leakage in the SF6 gas insulation apparatus based on the change in the gas pressure includes:
calculating a rate of decrease of the gas pressure;
and when the descending rate is larger than a preset rate, determining that the SF6 gas insulation equipment has gas leakage.
Optionally, determining whether there is a gas leakage in the SF6 gas insulation apparatus based on the change in the gas pressure includes:
recording the duration of the gas pressure drop;
and when the duration is longer than a preset time, determining that the SF6 gas insulation equipment has gas leakage.
Optionally, determining whether there is a gas leakage in the SF6 gas insulation apparatus based on the change in the gas pressure includes:
recording the number of successive drops in the gas pressure;
and when the continuous descending times are accumulated to reach a preset time, determining that the SF6 gas insulation equipment has gas leakage.
In a second aspect, an embodiment of the present invention further provides an online monitoring device for a substation SF6 gas insulation device, including:
the position information acquisition module is used for acquiring the position information of the pointer of the SF6 barometer acquired by the displacement sensor;
a gas pressure determination module for determining a gas pressure within the SF6 gas insulation device based on the location information;
the pressure difference calculation module is used for subtracting the gas pressure corresponding to the position information obtained at the K +1 th time from the gas pressure corresponding to the position information obtained at the K th time to obtain a pressure difference value;
a gas leakage determination module for determining whether there is gas leakage in the SF6 gas insulated device based on the change in the gas pressure when the pressure difference is less than zero;
and the warning information sending module is used for sending warning information when the SF6 gas insulation equipment has gas leakage.
Optionally, the displacement sensor is a linear displacement sensor, and the position information obtaining module includes:
the displacement information acquisition unit is used for acquiring the displacement information of the SF6 barometer pointer acquired by the linear displacement sensor;
a first position information determination unit for determining position information of the SF6 barometer pointer based on the displacement information.
Optionally, the displacement sensor is an angular displacement sensor, and the position information obtaining module includes:
the angle information acquisition unit is used for acquiring deflection angle information of the SF6 barometer pointer acquired by the angular displacement sensor;
a second position information determination unit for determining position information of the SF6 barometer pointer based on the deflection angle information.
Optionally, the gas leakage determination module comprises:
a decreasing rate calculating unit for calculating a decreasing rate of the gas pressure;
a first gas leakage determination unit for determining that there is gas leakage in the SF6 gas-insulated device when the falling rate is greater than a preset rate.
Optionally, the gas leakage determination module comprises:
a time recording unit for recording the duration of the gas pressure drop;
and the second gas leakage determining unit is used for determining that the SF6 gas insulation equipment has gas leakage when the duration is longer than the preset duration.
Optionally, the gas leakage determination module comprises:
a drop frequency recording unit for recording the continuous drop frequency of the gas pressure;
a third gas leakage determination unit for determining that there is gas leakage in the SF6 gas-insulated device when the number of consecutive drops accumulates to a preset number.
In a third aspect, an embodiment of the present invention further provides an online monitoring system for a substation SF6 gas insulation device, including:
the displacement sensor is arranged on a barometer of the SF6 gas insulation equipment, and is used for acquiring position information of a pointer of the SF6 barometer and sending the position information to the processor;
a processor for performing the substation SF6 gas insulated equipment online monitoring method as provided in the first aspect of the invention;
and the alarm is used for receiving the warning information sent by the processor and sending an alarm prompt.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the program, when executed by a processor, implements the online monitoring method for the SF6 gas insulated equipment of the substation provided in the first aspect of the present invention.
According to the online monitoring method for the SF6 gas insulation equipment of the transformer substation, after the position information of the pointer of the SF6 gas pressure gauge acquired by the displacement sensor is acquired, the gas pressure in the SF6 gas insulation equipment is determined based on the position information, the gas pressure corresponding to the position information acquired at the K +1 th time is subtracted from the gas pressure corresponding to the position information acquired at the K th time to obtain a pressure difference value, when the pressure difference value is smaller than zero, whether gas leakage exists in the SF6 gas insulation equipment is determined based on the change of the gas pressure, and warning information is sent out when the gas leakage exists in the SF6 gas insulation equipment. Through the real-time monitoring of the gas pressure in the SF6 gas insulation equipment, when gas leakage exists in the SF6 gas insulation equipment, workers are prompted to take safety measures in time, and major accidents of a power grid are avoided.
Drawings
Fig. 1 is a flowchart of an online monitoring method for substation SF6 gas insulation equipment according to an embodiment of the present invention;
fig. 2 is a flowchart of an online monitoring method for substation SF6 gas insulation equipment according to a second embodiment of the present invention;
fig. 3 is a flowchart of an online monitoring method for substation SF6 gas insulation equipment according to a third embodiment of the present invention;
fig. 4 is a flowchart of an online monitoring method for substation SF6 gas insulation equipment according to a fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of an online monitoring device for SF6 gas insulation equipment of a transformer substation according to a fifth embodiment of the present invention;
fig. 6 is a schematic structural diagram of an online monitoring system for substation SF6 gas insulation equipment according to a sixth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a method for online monitoring of a substation SF6 gas insulated device according to an embodiment of the present invention, where the present embodiment is applicable to online monitoring of gas pressure of an SF6 gas insulated device, the method may be executed by an online monitoring apparatus for a substation SF6 gas insulated device according to an embodiment of the present invention, the apparatus may be implemented in a software and/or hardware manner, and is generally configured in a computer device, as shown in fig. 1, the method specifically includes the following steps:
and S101, acquiring position information of an SF6 barometer pointer acquired by a displacement sensor.
In the embodiment of the invention, the displacement sensor is used for acquiring the position information of the pointer of the SF6 barometer, converting the position information into an analog electric signal and sending the analog electric signal to the processor. The processor may be integrated on the SF6 gas-insulated device, or may be provided separately from the SF6 gas-insulated device, and the embodiment of the present invention is not limited herein. The position information of the pointer of the SF6 barometer is used for reflecting the gas pressure inside the SF6 gas insulation device. In some embodiments of the present invention, the displacement sensor may collect a displacement change of the pointer of the SF6 barometer as the position information, and in other embodiments of the present invention, the displacement sensor may collect an angle change of the pointer of the SF6 barometer as the position information, which is not limited herein.
Illustratively, in one embodiment of the present invention, the displacement sensor is a linear displacement sensor, and the linear displacement sensor functions to convert the linear mechanical displacement into an electrical signal. To achieve this effect, the variable resistance slide rail is usually fixed to the fixed part of the sensor, and different resistance values are measured by the displacement of the slide rail. The sensor slide rail is connected with a steady-state direct-current voltage, a small current of microamperes is allowed to flow, and the voltage between the slide sheet and the initial end is in direct proportion to the moving length of the slide sheet.
The acquiring of the position information of the pointer of the SF6 barometer collected by the displacement sensor may include:
the method comprises the steps of obtaining displacement information of an SF6 barometer pointer acquired by a linear displacement sensor, wherein the displacement information is used for reflecting the displacement of a reference point (such as a needle tip) on the SF6 barometer pointer in the time interval of two adjacent acquisitions. And then, determining the position information of the pointer of the SF6 barometer based on the displacement information, for example, adding the position information acquired last time to the displacement information of the pointer of the SF6 barometer acquired at the current time to obtain the position information of the pointer of the current SF6 barometer.
Illustratively, in one embodiment of the invention, the displacement sensor is an angular displacement sensor, which converts angle measurement into measurement of other physical quantities, and adopts a non-contact patent design, thereby effectively improving long-term reliability compared with other traditional angular displacement measuring instruments such as a synchronous analyzer and a potentiometer. The sensor adopts a rotor and a wire-wound coil with special shapes, simulates the linear displacement of a Linear Variable Differential Transformer (LVDT), has higher reliability and performance, and the rotary motion of a rotor shaft generates a linear output signal which moves by +/-60 (120 degrees in total) degrees around a factory preset zero position. The phase of this output signal indicates the direction of displacement from the null. The non-contact electromagnetic coupling of the rotor enables the product to have infinite resolution, namely the absolute measurement accuracy can reach a few tenths of degrees.
The acquiring of the position information of the pointer of the SF6 barometer collected by the displacement sensor may include:
and acquiring deflection angle information of the pointer of the SF6 barometer acquired by the angular displacement sensor, wherein the deflection angle information is used for reflecting the deflection angle of the pointer of the SF6 barometer in the time interval of two adjacent acquisitions. Position information for the SF6 barometer pointer is then determined based on the deflection angle information.
S102, determining the gas pressure inside the SF6 gas insulation device based on the position information.
In the embodiment of the invention, the position information of the pointer of the SF6 barometer reflects the gas pressure inside the SF6 gas insulation equipment. The gas pressure inside the SF6 gas insulation equipment can be obtained by converting the position information of the pointer of the SF6 gas gauge into an analog electric signal and processing the analog electric signal.
S103, subtracting the gas pressure corresponding to the position information acquired at the K +1 th time from the gas pressure corresponding to the position information acquired at the K th time to obtain a pressure difference value.
In the embodiment of the invention, the position information of the pointer of the SF6 barometer acquired by the displacement sensor is acquired at a certain frequency, and specifically, the position information of the pointer of the SF6 barometer is acquired by the displacement sensor at a certain acquisition frequency (for example, acquired every 0.2 s), and is converted into an analog electric signal to be sent to the processor. The processor processes the received analog electric signal to obtain the gas pressure intensity in the SF6 gas insulation equipment acquired each time, and subtracts the gas pressure intensity corresponding to the position information acquired last time from the gas pressure intensity corresponding to the position information acquired last time to obtain a pressure intensity difference value.
And S104, when the pressure difference value is smaller than zero, determining whether the SF6 gas insulation equipment has gas leakage or not based on the change of the gas pressure.
In the embodiment of the invention, after the pressure difference value between the currently acquired gas pressure and the previously acquired gas pressure is obtained, whether the pressure difference value is smaller than zero is judged. When the pressure difference is less than zero, indicating the possibility of a leakage in the SF6 gas-insulated device, it is further determined whether a gas leakage in the SF6 gas-insulated device exists based on a subsequent gas pressure shift.
And S105, sending warning information when the SF6 gas insulation equipment has gas leakage.
When the SF6 gas insulation equipment is determined to have gas leakage, a warning signal is sent to an alarm or terminal equipment of staff in charge of the SF6 gas insulation equipment, such as a working computer and a personal mobile phone, so that the staff is prompted to take safety measures, and major accidents of a power grid are avoided.
According to the online monitoring method for the SF6 gas insulation equipment of the transformer substation, after the position information of the pointer of the SF6 gas pressure gauge acquired by the displacement sensor is acquired, the gas pressure in the SF6 gas insulation equipment is determined based on the position information, the gas pressure corresponding to the position information acquired at the K +1 th time is subtracted from the gas pressure corresponding to the position information acquired at the K th time to obtain a pressure difference value, when the pressure difference value is smaller than zero, whether gas leakage exists in the SF6 gas insulation equipment is determined based on the change of the gas pressure, and warning information is sent out when the gas leakage exists in the SF6 gas insulation equipment. Through the real-time monitoring of the gas pressure in the SF6 gas insulation equipment, when gas leakage exists in the SF6 gas insulation equipment, workers are prompted to take safety measures in time, and major accidents of a power grid are avoided.
Example two
Fig. 2 is a flowchart of an online monitoring method for substation SF6 gas insulated equipment according to a second embodiment of the present invention, which is detailed based on the first embodiment, and describes in detail a specific process of determining whether there is gas leakage in SF6 gas insulated equipment, as shown in fig. 2, the method specifically includes the following steps:
s201, acquiring position information of an SF6 barometer pointer acquired by a displacement sensor.
In the embodiment of the invention, the displacement sensor is used for acquiring the position information of the pointer of the SF6 barometer, converting the position information into an analog electric signal and sending the analog electric signal to the processor. The position information of the pointer of the SF6 barometer is used for reflecting the gas pressure inside the SF6 gas insulation device. In some embodiments of the present invention, the displacement sensor may collect a displacement change of the pointer of the SF6 barometer as the position information, and in other embodiments of the present invention, the displacement sensor may collect an angle change of the pointer of the SF6 barometer as the position information, which is not limited herein.
S202, determining the gas pressure inside the SF6 gas insulation device based on the position information.
In the embodiment of the invention, the position information of the pointer of the SF6 barometer reflects the gas pressure inside the SF6 gas insulation equipment. The gas pressure inside the SF6 gas insulation equipment can be obtained by converting the position information of the pointer of the SF6 gas gauge into an analog electric signal and processing the analog electric signal.
S203, subtracting the gas pressure corresponding to the position information acquired at the K +1 th time from the gas pressure corresponding to the position information acquired at the K th time to obtain a pressure difference value.
In the embodiment of the invention, the position information of the pointer of the SF6 barometer acquired by the displacement sensor is acquired at a certain frequency, and specifically, the position information of the pointer of the SF6 barometer is acquired by the displacement sensor at a certain acquisition frequency (for example, acquired every 0.2 s), and is converted into an analog electric signal to be sent to the processor. The processor processes the received analog electric signal to obtain the gas pressure intensity in the SF6 gas insulation equipment acquired each time, and subtracts the gas pressure intensity corresponding to the position information acquired last time from the gas pressure intensity corresponding to the position information acquired last time to obtain a pressure intensity difference value.
And S204, judging whether the pressure difference value is smaller than zero.
And after the pressure difference value between the gas pressure acquired at the current time and the gas pressure acquired at the previous time is obtained, judging whether the pressure difference value is smaller than zero. If the pressure difference is less than zero, indicating the possibility of a leakage in the SF6 gas-insulated device, it is further determined whether a gas leakage in the SF6 gas-insulated device exists based on a subsequent gas pressure shift. Specifically, in the embodiment of the present invention, if the pressure difference is smaller than zero, step S205 is executed.
And S205, calculating the descending rate of the gas pressure.
And continuously acquiring the position information of the pointer of the subsequent SF6 barometer for multiple times, determining the gas pressure in the SF6 gas insulation equipment based on the position information, and calculating the descending rate of the gas pressure based on the change of the gas pressure corresponding to the position information of the pointer of the subsequent SF6 barometer acquired for multiple times and the total time for acquiring the position information of the pointer of the subsequent SF6 barometer for multiple times. For example, in some embodiments of the present invention, the average decreasing rate obtained by dividing the change of the gas pressure corresponding to the position information of the pointer of the SF6 barometer obtained for a plurality of times by the total time is used as the decreasing rate of the gas pressure. In other embodiments of the present invention, the differential of the gas pressure over time is calculated to obtain the rate of decrease of the gas pressure.
S206, judging whether the descending rate is larger than a preset rate.
And comparing the calculated descending rate with a preset rate, and judging whether the descending rate is greater than the preset rate. If the descending rate is greater than the predetermined rate, step S207 is executed.
And S207, determining that gas leakage exists in the SF6 gas insulation equipment.
Specifically, when the falling rate is larger than the preset rate, it is determined that the SF6 gas insulation apparatus has gas leakage.
And S208, sending out warning information.
In the embodiment of the invention, when the SF6 gas insulation equipment is determined to have gas leakage, a warning signal is sent to an alarm or terminal equipment of staff in charge of the SF6 gas insulation equipment, such as a working computer and a personal mobile phone, so that the staff is prompted to take safety measures to avoid major accidents of a power grid.
According to the online monitoring method for the SF6 gas insulation equipment of the transformer substation, after the position information of the pointer of the SF6 gas pressure gauge acquired by the displacement sensor is acquired, the gas pressure in the SF6 gas insulation equipment is determined based on the position information, the gas pressure corresponding to the position information acquired at the K +1 th time is subtracted from the gas pressure corresponding to the position information acquired at the K th time to obtain a pressure difference value, when the pressure difference value is smaller than zero, whether gas leakage exists in the SF6 gas insulation equipment is determined based on the reduction rate of the gas pressure, warning information is sent out when the gas leakage exists in the SF6 gas insulation equipment, a worker is prompted to take safety measures in time, and major accidents of a power grid are avoided. Based on the double detection of the pressure difference and the reduction rate, the accuracy of monitoring is improved, and the occurrence of false alarm is avoided.
EXAMPLE III
Fig. 3 is a flowchart of an online monitoring method for SF6 gas insulated equipment in a substation according to a third embodiment of the present invention, which is detailed based on the first embodiment of the present invention, and describes in detail a specific process of determining whether there is gas leakage in SF6 gas insulated equipment, as shown in fig. 3, the method specifically includes the following steps:
s301, acquiring position information of an SF6 barometer pointer acquired by a displacement sensor.
In the embodiment of the invention, the displacement sensor is used for acquiring the position information of the pointer of the SF6 barometer, converting the position information into an analog electric signal and sending the analog electric signal to the processor. The position information of the pointer of the SF6 barometer is used for reflecting the gas pressure inside the SF6 gas insulation device. In some embodiments of the present invention, the displacement sensor may collect a displacement change of the pointer of the SF6 barometer as the position information, and in other embodiments of the present invention, the displacement sensor may collect an angle change of the pointer of the SF6 barometer as the position information, which is not limited herein.
S302, determining the gas pressure inside the SF6 gas insulation device based on the position information.
In the embodiment of the invention, the position information of the pointer of the SF6 barometer reflects the gas pressure inside the SF6 gas insulation equipment. The gas pressure inside the SF6 gas insulation equipment can be obtained by converting the position information of the pointer of the SF6 gas gauge into an analog electric signal and processing the analog electric signal.
S303, subtracting the gas pressure corresponding to the position information acquired at the K +1 th time from the gas pressure corresponding to the position information acquired at the K th time to obtain a pressure difference value.
In the embodiment of the invention, the position information of the pointer of the SF6 barometer acquired by the displacement sensor is acquired at a certain frequency, and specifically, the position information of the pointer of the SF6 barometer is acquired by the displacement sensor at a certain acquisition frequency (for example, acquired every 0.2 s), and is converted into an analog electric signal to be sent to the processor. The processor processes the received analog electric signal to obtain the gas pressure intensity in the SF6 gas insulation equipment acquired each time, and subtracts the gas pressure intensity corresponding to the position information acquired last time from the gas pressure intensity corresponding to the position information acquired last time to obtain a pressure intensity difference value.
S304, judging whether the pressure difference value is smaller than zero.
And after the pressure difference value between the gas pressure acquired at the current time and the gas pressure acquired at the previous time is obtained, judging whether the pressure difference value is smaller than zero. If the pressure difference is less than zero, indicating the possibility of a leakage in the SF6 gas-insulated device, it is further determined whether a gas leakage in the SF6 gas-insulated device exists based on a subsequent gas pressure shift. Specifically, in the embodiment of the present invention, if the pressure difference value is smaller than zero, step S305 is performed.
S305, recording the duration of the gas pressure drop.
And continuously acquiring the position information of the pointer of the subsequent SF6 barometer for multiple times, determining the gas pressure in the SF6 gas insulation equipment based on the position information, and recording the duration of the gas pressure drop when more than 2 continuous gas pressure drops occur.
And S306, judging whether the duration is longer than a preset duration.
And comparing the obtained duration of the gas pressure drop with a preset duration, and judging whether the duration is greater than the preset duration. If the duration is greater than the preset duration, step S307 is executed.
S307, determining that the SF6 gas insulation equipment has gas leakage.
Specifically, when the duration is longer than the preset duration, it is determined that there is a gas leak in the SF6 gas-insulated equipment.
And S308, sending out warning information.
In the embodiment of the invention, when the SF6 gas insulation equipment is determined to have gas leakage, a warning signal is sent to an alarm or terminal equipment of staff in charge of the SF6 gas insulation equipment, such as a working computer and a personal mobile phone, so that the staff is prompted to take safety measures to avoid major accidents of a power grid.
According to the online monitoring method for the SF6 gas insulation equipment of the transformer substation, after the position information of the pointer of the SF6 gas pressure gauge acquired by the displacement sensor is acquired, the gas pressure in the SF6 gas insulation equipment is determined based on the position information, the gas pressure corresponding to the position information acquired at the K +1 th time is subtracted from the gas pressure corresponding to the position information acquired at the K th time to obtain a pressure difference value, when the pressure difference value is smaller than zero, whether gas leakage exists in the SF6 gas insulation equipment is determined based on the duration of the gas pressure reduction, warning information is sent out when the gas leakage exists in the SF6 gas insulation equipment, a worker is prompted to take safety measures in time, and major accidents of a power grid are avoided. Based on the double detection of the pressure difference and the duration of the pressure reduction, the accuracy of monitoring is improved, and the occurrence of false alarm is avoided.
Example four
Fig. 4 is a flowchart of an online monitoring method for SF6 gas insulated equipment in a substation according to a fourth embodiment of the present invention, which is detailed based on the first embodiment of the present invention, and describes in detail a specific process of determining whether there is gas leakage in SF6 gas insulated equipment, as shown in fig. 4, the method specifically includes the following steps:
s401, acquiring position information of an SF6 barometer pointer acquired by a displacement sensor.
In the embodiment of the invention, the displacement sensor is used for acquiring the position information of the pointer of the SF6 barometer, converting the position information into an analog electric signal and sending the analog electric signal to the processor. The position information of the pointer of the SF6 barometer is used for reflecting the gas pressure inside the SF6 gas insulation device. In some embodiments of the present invention, the displacement sensor may collect a displacement change of the pointer of the SF6 barometer as the position information, and in other embodiments of the present invention, the displacement sensor may collect an angle change of the pointer of the SF6 barometer as the position information, which is not limited herein.
S402, determining the gas pressure inside the SF6 gas insulation device based on the position information.
In the embodiment of the invention, the position information of the pointer of the SF6 barometer reflects the gas pressure inside the SF6 gas insulation equipment. The gas pressure inside the SF6 gas insulation equipment can be obtained by converting the position information of the pointer of the SF6 gas gauge into an analog electric signal and processing the analog electric signal.
And S403, subtracting the gas pressure corresponding to the position information obtained at the K +1 th time from the gas pressure corresponding to the position information obtained at the K th time to obtain a pressure difference value.
In the embodiment of the invention, the position information of the pointer of the SF6 barometer acquired by the displacement sensor is acquired at a certain frequency, and specifically, the position information of the pointer of the SF6 barometer is acquired by the displacement sensor at a certain acquisition frequency (for example, acquired every 0.2 s), and is converted into an analog electric signal to be sent to the processor. The processor processes the received analog electric signal to obtain the gas pressure intensity in the SF6 gas insulation equipment acquired each time, and subtracts the gas pressure intensity corresponding to the position information acquired last time from the gas pressure intensity corresponding to the position information acquired last time to obtain a pressure intensity difference value.
And S404, judging whether the pressure difference value is smaller than zero.
And after the pressure difference value between the gas pressure acquired at the current time and the gas pressure acquired at the previous time is obtained, judging whether the pressure difference value is smaller than zero. If the pressure difference is less than zero, indicating the possibility of a leakage in the SF6 gas-insulated device, it is further determined whether a gas leakage in the SF6 gas-insulated device exists based on a subsequent gas pressure shift. Specifically, in the embodiment of the present invention, if the pressure difference is smaller than zero, step S405 is executed.
And S405, recording the continuous reduction times of the gas pressure.
And continuously acquiring the position information of the pointer of the subsequent SF6 barometer for multiple times, determining the gas pressure in the SF6 gas insulation equipment based on the position information, and when the gas pressure drops for more than 2 times continuously, continuously dropping the gas pressure for multiple times.
And S406, judging whether the continuous descending times are more than the preset times.
And comparing the obtained continuous descending times of the gas pressure with preset times, and judging whether the continuous descending times are greater than the preset times. If the continuous descending number is greater than the preset number, step S407 is executed.
And S407, determining that the SF6 gas insulation equipment has gas leakage.
Specifically, when the number of successive drops is greater than a preset number, it is determined that there is a gas leak in the SF6 gas-insulated apparatus.
And S408, sending out warning information.
In the embodiment of the invention, when the SF6 gas insulation equipment is determined to have gas leakage, a warning signal is sent to an alarm or terminal equipment of staff in charge of the SF6 gas insulation equipment, such as a working computer and a personal mobile phone, so that the staff is prompted to take safety measures to avoid major accidents of a power grid.
According to the online monitoring method for the SF6 gas insulation equipment of the transformer substation, after the position information of the pointer of the SF6 gas pressure gauge acquired by the displacement sensor is acquired, the gas pressure in the SF6 gas insulation equipment is determined based on the position information, the gas pressure corresponding to the position information acquired at the K +1 th time is subtracted from the gas pressure corresponding to the position information acquired at the K th time to obtain a pressure difference value, when the pressure difference value is smaller than zero, whether gas leakage exists in the SF6 gas insulation equipment is determined based on the continuous descending times of the gas pressure, warning information is sent out when the gas leakage exists in the SF6 gas insulation equipment, workers are prompted to take safety measures in time, and major accidents of a power grid are avoided. Based on the double detection of the pressure difference and the continuous reduction times of the gas pressure, the accuracy of monitoring is improved, and the occurrence of false alarm is avoided.
In another embodiment of the invention, when the pressure difference is less than zero, the three verification steps are carried out based on the reduction rate of the gas pressure, the duration of the gas pressure reduction and the continuous reduction times of the gas pressure, whether the SF6 gas insulation equipment has gas leakage is judged, and only when the three conditions all meet the preset conditions, the SF6 gas insulation equipment is determined to have gas leakage, so that the monitoring accuracy is further improved, and the occurrence of false alarm is avoided. In the embodiment of the present invention, the determination order of the three conditions is not limited.
EXAMPLE five
Fig. 5 is a schematic structural diagram of an online monitoring device for SF6 gas insulation equipment of a transformer substation, which is provided in the fifth embodiment of the present invention, and includes:
a position information obtaining module 501, configured to obtain position information of an SF6 barometer pointer acquired by a displacement sensor;
a gas pressure determination module 502 for determining a gas pressure within the SF6 gas insulation device based on the position information;
the pressure difference calculation module 503 is configured to subtract the gas pressure corresponding to the position information obtained at the K +1 th time from the gas pressure corresponding to the position information obtained at the K th time to obtain a pressure difference value;
a gas leakage determination module 504 for determining whether there is a gas leakage from the SF6 gas insulated device based on a change in the gas pressure when the pressure difference is less than zero;
and a warning message sending module 505, configured to send out a warning message when there is a gas leakage in the SF6 gas-insulated equipment.
In some embodiments of the present invention, the displacement sensor is a linear displacement sensor, and the position information obtaining module 501 includes:
the displacement information acquisition unit is used for acquiring the displacement information of the SF6 barometer pointer acquired by the linear displacement sensor;
a first position information determination unit for determining position information of the SF6 barometer pointer based on the displacement information.
In some embodiments of the present invention, the displacement sensor is an angular displacement sensor, and the position information obtaining module 501 includes:
the angle information acquisition unit is used for acquiring deflection angle information of the SF6 barometer pointer acquired by the angular displacement sensor;
a second position information determination unit for determining position information of the SF6 barometer pointer based on the deflection angle information.
In some embodiments of the present invention, the gas leak determination module 504 includes:
a decreasing rate calculating unit for calculating a decreasing rate of the gas pressure;
a first gas leakage determination unit for determining that there is gas leakage in the SF6 gas-insulated device when the falling rate is greater than a preset rate.
In some embodiments of the present invention, the gas leak determination module 504 includes:
a time recording unit for recording the duration of the gas pressure drop;
and the second gas leakage determining unit is used for determining that the SF6 gas insulation equipment has gas leakage when the duration is longer than the preset duration.
In some embodiments of the present invention, the gas leak determination module 504 includes:
a drop frequency recording unit for recording the continuous drop frequency of the gas pressure;
a third gas leakage determination unit for determining that there is gas leakage in the SF6 gas-insulated device when the number of consecutive drops accumulates to a preset number.
The on-line monitoring device for the SF6 gas insulation equipment of the power station can execute the method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
EXAMPLE six
Sixth embodiment of the present invention provides an online monitoring system for a substation SF6 gas insulated device, fig. 6 is a schematic structural diagram of the online monitoring system for a substation SF6 gas insulated device provided in sixth embodiment of the present invention, and as shown in fig. 6, the computer device includes a processor 601, a memory 602, a communication module 603, an input device 604, and an output device 605. The input device 604 includes a displacement sensor, and the displacement sensor is disposed on a barometer of the SF6 gas-insulated device, and is configured to acquire position information of a pointer of the SF6 barometer, and send the position information to the processor 601. The output device 605 may include an alarm for receiving the warning message sent by the processor 601 and sending an alarm prompt.
Illustratively, the displacement sensor is a linear displacement sensor, the linear displacement sensor comprises a sliding brush and a substrate, the sliding brush is arranged on a pointer of the barometer, and the substrate is arc-shaped and is arranged below the dial.
Illustratively, the displacement sensor is an angular displacement sensor which is arranged on a pointer rotating shaft of the SF6 barometer.
The number of the processors 601 in the system may be one or more, and one processor 601 is taken as an example in fig. 6; the processor 601, the memory 602, the communication module 603, the input device 604 and the output device 605 in the system may be connected by a bus or other means, and fig. 6 illustrates the connection by the bus as an example. The processor 601, the memory 602, the communication module 603, the input device 604 and the output device 605 may be integrated on a control board of the computer apparatus.
The memory 602 is a computer-readable storage medium, and can be used to store software programs, computer-executable programs, and modules, such as modules corresponding to the online monitoring method for substation SF6 gas insulated equipment in the embodiment of the present invention. The processor 601 executes various functional applications and data processing of the computer device by running the software programs, instructions and modules stored in the memory 602, namely, the online monitoring method for the substation SF6 gas insulated equipment provided by the above embodiments is implemented.
The memory 602 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the computer device, and the like. Further, the memory 602 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 602 may further include memory located remotely from the processor 601, which may be connected to a computer device through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The communication module 603 is configured to establish a connection with an external device (e.g., an intelligent terminal), and implement data interaction with the external device. The input device 604 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function controls of the computer apparatus.
The computer device provided by this embodiment may implement the online monitoring method for the SF6 gas insulation equipment of the substation provided by any of the above embodiments of the present invention, and has corresponding functions and advantages.
EXAMPLE seven
The seventh embodiment of the present invention provides a storage medium containing computer executable instructions, where a computer program is stored on the storage medium, and when the computer program is executed by a processor, the online monitoring method for the SF6 gas insulation equipment of the substation provided in any of the above embodiments of the present invention is implemented.
The online monitoring method for the SF6 gas insulation equipment of the transformer substation comprises the following steps:
acquiring position information of an SF6 barometer pointer acquired by a displacement sensor;
determining a gas pressure within the SF6 gas insulated device based on the location information;
subtracting the gas pressure corresponding to the position information obtained at the K +1 th time from the gas pressure corresponding to the position information obtained at the K th time to obtain a pressure difference value;
determining whether there is a gas leakage in the SF6 gas insulated device based on a change in the gas pressure when the pressure difference is less than zero;
and sending out a warning message when the SF6 gas insulation equipment has gas leakage.
Of course, the storage medium provided by the embodiment of the present invention contains computer executable instructions, and the computer executable instructions are not limited to the operations of the method described above, and may also execute the operations related to the online monitoring method for substation SF6 gas insulation equipment provided by the embodiment of the present invention.
It should be noted that, as for the apparatus, the device and the storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and in relevant places, reference may be made to the partial description of the method embodiments.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, and the computer software product may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions to enable a computer device (which may be a robot, a personal computer, a server, or a network device) to perform the online monitoring method for the SF6 gas insulated substation equipment according to any embodiment of the present invention.
It should be noted that, in the above apparatus, each module and unit included in the apparatus is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by suitable instruction execution devices. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An on-line monitoring method for SF6 gas insulation equipment of a transformer substation is characterized by comprising the following steps:
acquiring position information of an SF6 barometer pointer acquired by a displacement sensor;
determining a gas pressure within the SF6 gas insulated device based on the location information;
subtracting the gas pressure corresponding to the position information obtained at the K +1 th time from the gas pressure corresponding to the position information obtained at the K th time to obtain a pressure difference value;
determining whether there is a gas leakage in the SF6 gas insulated device based on a change in the gas pressure when the pressure difference is less than zero;
and sending out a warning message when the SF6 gas insulation equipment has gas leakage.
2. The substation SF6 gas insulation equipment online monitoring method of claim 1, wherein the displacement sensor is a linear displacement sensor, obtaining position information of SF6 barometer pointer collected by the displacement sensor comprises:
acquiring displacement information of the SF6 barometer pointer acquired by the linear displacement sensor;
and determining the position information of the SF6 barometer pointer based on the displacement information.
3. The substation SF6 gas insulated equipment online monitoring method of claim 1, wherein the displacement sensor is an angular displacement sensor, obtaining position information of SF6 barometer pointer collected by the displacement sensor comprises:
acquiring deflection angle information of the SF6 barometer pointer acquired by the angular displacement sensor;
determining position information of the SF6 barometer pointer based on the deflection angle information.
4. The substation SF6 gas insulated device online monitoring method of claim 1, wherein determining whether there is a gas leak in the SF6 gas insulated device based on the change in the gas pressure comprises:
calculating a rate of decrease of the gas pressure;
and when the descending rate is larger than a preset rate, determining that the SF6 gas insulation equipment has gas leakage.
5. The substation SF6 gas insulated device online monitoring method of claim 1, wherein determining whether there is a gas leak in the SF6 gas insulated device based on the change in the gas pressure comprises:
recording the duration of the gas pressure drop;
and when the duration is longer than a preset time, determining that the SF6 gas insulation equipment has gas leakage.
6. The substation SF6 gas insulated device online monitoring method of claim 1, wherein determining whether there is a gas leak in the SF6 gas insulated device based on the change in the gas pressure comprises:
recording the number of successive drops in the gas pressure;
and when the continuous descending times are accumulated to reach a preset time, determining that the SF6 gas insulation equipment has gas leakage.
7. The utility model provides a transformer substation SF6 gas insulation equipment on-line monitoring device which characterized in that includes:
the position information acquisition module is used for acquiring the position information of the pointer of the SF6 barometer acquired by the displacement sensor;
a gas pressure determination module for determining a gas pressure within the SF6 gas insulation device based on the location information;
the pressure difference calculation module is used for subtracting the gas pressure corresponding to the position information obtained at the K +1 th time from the gas pressure corresponding to the position information obtained at the K th time to obtain a pressure difference value;
a gas leakage determination module for determining whether there is gas leakage in the SF6 gas insulated device based on the change in the gas pressure when the pressure difference is less than zero;
and the warning information sending module is used for sending warning information when the SF6 gas insulation equipment has gas leakage.
8. The utility model provides a transformer substation SF6 gas insulation equipment on-line monitoring system which characterized in that includes:
the displacement sensor is arranged on a barometer of the SF6 gas insulation equipment, and is used for acquiring position information of a pointer of the SF6 barometer and sending the position information to the processor;
a processor for performing the substation SF6 gas insulated device on-line monitoring method of any of claims 1-6;
and the alarm is used for receiving the warning information sent by the processor and sending an alarm prompt.
9. The substation SF6 gas insulated equipment online monitoring system of claim 8, wherein the displacement sensor is a linear displacement sensor or an angular displacement sensor;
the linear displacement sensor comprises a sliding brush and a substrate, the sliding brush is arranged on a pointer of the barometer, and the substrate is arranged below the dial;
the angular displacement sensor is arranged on a rotating shaft of a pointer of the barometer.
10. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the method of online monitoring of substation SF6 gas insulated equipment according to any one of claims 1 to 6.
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