Low-error GIS circuit breaker gas density monitoring device and method thereof

Abstract

The invention discloses a low-error GIS circuit breaker gas density monitoring device and method, and the device comprises a first temperature sensor which is connected with a GIS circuit breaker gas chamber and is used for detecting the temperature of the GIS circuit breaker gas chamber; the gas density relay is connected with the GIS circuit breaker gas chamber and is used for sensing the SF6 gas pressure in the GIS circuit breaker; the gas density relay is provided with a heating element, and the heating element is used for heating the interior of the gas density relay; and the remote transmission density monitor is connected with the temperature sensor I, the gas density relay and the heating element. According to the invention, the temperature of the gas chamber of the GIS circuit breaker is fed back through the temperature sensor I, and the acquisition and control board starts the heating element to heat the gas density relay, so that the problem of inaccurate measurement caused by temperature compensation failure in a low-temperature environment is effectively solved, and the gas pressure of the gas chamber of the circuit breaker can be accurately detected.

Description

Technical Field

[0001] The invention relates to the field of electric power detection, and in particular to a low-error GIS circuit breaker gas density monitoring device and method thereof. Background Art

[0002] With the rapid development of the electric power industry, GIS (Gas Insulated Switchgear) has been widely used in power systems due to its excellent insulation performance, compact structure and high reliability. However, the SF6 (sulfur hexafluoride) gas used inside the GIS may leak during operation, resulting in a decrease in the insulation performance of the equipment and even causing failures. In order to monitor the status of SF6 gas in real time, GIS gas density relays came into being. GIS gas density relays are a monitoring device based on the principle of pressure measurement, which is used to monitor the density of SF6 gas inside GIS in real time. With the advancement of science and technology, modern GIS gas density relays have intelligent and remote monitoring functions. By connecting to the automation control system of the power system, operation and maintenance personnel can remotely monitor the working status of the density relay and the real-time data of SF6 gas, realizing a more convenient and efficient management method.

[0003] The temperature compensation of density relays currently used in the market is all compensated by the gas temperature inside them, which meets the application requirements under normal and high temperature conditions. However, when the temperature drops to a certain temperature below zero, the SF6 in the GIS will liquefy, and the greater the gas pressure, the lower the liquefaction temperature point. In order to prevent the liquefaction of SF6 gas, circuit breakers in cold areas will be equipped with heating tapes. When the temperature is lower than a certain value, the circuit breaker is heated so that the temperature of the circuit breaker gas chamber is in a state suitable for work; but since there is no heating device at the location of the density relay, the temperatures at the two locations are inconsistent, and the conventional density relay detection results cannot correctly reflect the gas pressure of the GIS circuit breaker gas chamber, the measurement is inaccurate and it is easy to cause false alarms and malfunctions, causing hidden dangers. Based on this, the present invention provides a low-error GIS circuit breaker gas density monitoring device and method, which can effectively solve the above problems. Summary of the invention

[0004] The present invention provides a low-error GIS circuit breaker gas density monitoring device and method thereof, so as to solve the problem of low-error detection of gas pressure in a GIS circuit breaker gas chamber at low temperature.

[0005] To achieve the above-mentioned purpose, an embodiment of the present invention provides a low-error GIS circuit breaker gas density monitoring device, comprising: a temperature sensor 1, a gas density relay and a remote density monitor; Temperature sensor 1 is connected to the gas chamber of the GIS circuit breaker and is used to detect the temperature of the gas chamber of the GIS circuit breaker; The gas density relay is connected to the gas chamber of the GIS circuit breaker and is used to sense the SF6 gas pressure inside the GIS circuit breaker; The remote density monitor is connected to the temperature sensor 1, the gas density relay and the heating element. On the one hand, it is used to receive the temperature of the GIS circuit breaker gas chamber detected by the temperature sensor 1, and collect the internal temperature of the gas density relay, and compare the former temperature of the GIS circuit breaker gas chamber with the latter internal temperature of the gas density relay. If the former temperature is greater than the latter temperature, the heating element is turned on to heat the inside of the gas density relay until the temperature error between the two is within the set range and the heating is stopped; on the other hand, it is used to collect the SF6 gas pressure inside the GIS circuit breaker sensed by the gas density relay, and in combination with the internal temperature of the gas density relay, the gas pressure value is calculated through the temperature compensation formula.

[0006] Optionally, in this embodiment, the gas density relay comprises: a pressure detection tube, a U-shaped metal sheet, a transmission element, a pressure dial pointer, a micro switch contact and a heating element; The pressure detection tube is connected to the gas supply interface of the GIS circuit breaker gas chamber to sense the SF6 gas pressure inside the GIS circuit breaker gas chamber. When the pressure changes, the pressure detection tube will deform accordingly, thereby driving the transmission element to work; One end of the U-shaped metal sheet is connected to the pressure detection tube, and the other end is connected to the transmission element; the additional deformation caused by the thermal expansion and contraction of the pressure detection tube due to temperature changes is compensated by the U-shaped metal sheet, ensuring that the pressure detection tube accurately reflects the changes in gas pressure; The transmission element is connected to the pressure gauge pointer and the micro switch contact, and is used to drive the pressure gauge pointer so that the pressure gauge pointer changes with the pressure change. At the same time, when the sensed air pressure reaches the set threshold, the micro switch contact is triggered to send out an alarm or control signal. The pressure dial pointer is used to display the sensed gas pressure value; The micro switch contacts are used to send out an alarm or control signal when the sensed air pressure reaches the set threshold; The heating element is used to heat the inside of the gas density relay so that the error between its internal temperature and the temperature of the GIS circuit breaker gas chamber is within the set range. At the heated temperature, the gas density relay uses the pressure detection tube and U-shaped metal sheet to detect the pressure, and the transmission element drives the pressure dial pointer and micro switch contacts to correctly display the GIS circuit breaker gas chamber pressure value and correctly output the contact signal; Optionally, in this embodiment, the remote density monitor includes: a pressure sensor, a second temperature sensor, a collection and control board, and a remote transmission module; The pressure sensor is connected to the pressure detection tube and is used to detect the air pressure in the pressure detection tube; The temperature sensor 2 is connected to the gas density relay and is used to detect the internal temperature of the gas density relay; The acquisition and control board is connected to the pressure sensor, temperature sensor 1, temperature sensor 2 and heating element. On the one hand, it is used to receive the temperature of the GIS circuit breaker gas chamber detected by temperature sensor 1 and the internal temperature of the gas density relay detected by temperature sensor 2, and compare the former temperature of the GIS circuit breaker gas chamber with the latter internal temperature of the gas density relay. If the former temperature is greater than the latter temperature, the heating element is turned on to heat the inside of the gas density relay until the temperature error between the two is within the set range and the heating is stopped; on the other hand, it is used to collect the SF gas pressure inside the GIS circuit breaker sensed by the gas density relay, and in combination with the internal temperature of the gas density relay, calculate the gas pressure value at an equivalent temperature of 20 degrees through the temperature compensation formula; The remote transmission module is connected to the acquisition and control board and is used to transmit the gas pressure value at an equivalent temperature of 20 degrees calculated by the acquisition and control board to the background system.

[0007] According to another embodiment of the present invention, a low-error GIS circuit breaker gas density monitoring method is provided, comprising the following steps: When the temperature is relatively low, in order to prevent the SF6 gas in the gas chamber of the GIS circuit breaker from liquefying, it is necessary to start the GIS circuit breaker heating tape to heat the GIS circuit breaker gas chamber; Collect the temperature of the GIS circuit breaker gas chamber and the internal temperature of the gas density relay. By comparison, if the former temperature is greater than the latter temperature, turn on the heating element to heat the inside of the gas density relay until the temperature error between the two is within the set range and stop heating; The gas density relay performs pressure detection at the heated temperature through the pressure detection tube and U-shaped metal sheet, and the transmission element drives the pressure dial pointer and the micro switch contacts to correctly display the GIS circuit breaker gas chamber pressure value and correctly output the contact signal; The acquisition and control board of the remote density monitor receives the pressure in the pressure detection tube detected by the pressure sensor and the internal temperature of the gas density relay detected by the temperature sensor 2, and calculates the gas pressure value at an equivalent temperature of 20 degrees through the temperature compensation formula. At the same time, the gas pressure value is transmitted to the background system through the remote transmission module; Keep looping the above steps and repeating them.

[0008] According to a low-error GIS circuit breaker gas density monitoring device and method of an embodiment of the present invention, a temperature sensor is used to monitor the current temperature information of the GIS circuit breaker gas chamber in real time and feed back the information to the acquisition and control board. After receiving these data, the acquisition and control board will accurately adjust the working state of the heating element. This control process is intended to adjust the temperature inside the gas density relay to keep it within a preset error range with the temperature of the GIS circuit breaker gas chamber. Such a design cleverly solves the problem of inaccurate measurement caused by the possible failure of the temperature compensation mechanism in a low temperature environment. Therefore, even under extremely low temperature conditions, the system can ensure accurate and correct detection of the gas pressure in the GIS circuit breaker gas chamber.

[0009] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The present invention is a structural block diagram of a low-error GIS circuit breaker gas density monitoring device according to an embodiment of the present invention.

[0011] Figure 2 The present invention is a flowchart of a method for monitoring gas density of a GIS circuit breaker with low error according to an embodiment of the present invention. DETAILED DESCRIPTION

[0012] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to further illustrate the present invention.

[0013] First, combine Figure 1 A low-error GIS circuit breaker gas density monitoring device according to an embodiment of the present invention is described, which is used for accurately monitoring the gas density of a GIS circuit breaker in a low-temperature environment and has a wide range of application scenarios.

[0014] like Figure 1 As shown, a low-error GIS circuit breaker gas density monitoring device according to an embodiment of the present invention comprises a temperature sensor 100, a gas density relay 200 and a remote density monitor 300.

[0015] Specifically, Figure 1 As shown, the temperature sensor 100 is connected to the gas chamber of the GIS circuit breaker to detect the temperature of the gas chamber of the GIS circuit breaker and feed it back to the collection and control board 303 of the remote density monitor 300.

[0016] Specifically, Figure 1As shown, the gas density relay 200 is connected to the gas chamber of the GIS circuit breaker and is used to sense the SF6 gas pressure inside the GIS circuit breaker; the gas density relay 200 is provided with a heating element 201, and the heating element 201 is used to heat the inside of the gas density relay 200 so that the error between its internal temperature and the temperature of the gas chamber of the GIS circuit breaker is within a set range.

[0017] Optionally, in this embodiment, if Figure 1 As shown, the gas density relay 200 includes: a pressure detection tube 202 , a pressure dial pointer 203 , a micro switch contact 204 , a transmission element 205 and a U-shaped metal sheet 206 .

[0018] In this embodiment, if Figure 1 As shown, the pressure detection tube 202 is connected to the gas supply interface of the GIS circuit breaker gas chamber, and is used to sense the SF6 gas pressure inside the GIS circuit breaker gas chamber. When the pressure inside the GIS circuit breaker gas chamber changes, its shape changes with the pressure change, thereby driving the transmission element 205 to work. The pressure detection tube 202 can adopt a Bourdon tube type (elastic metal curved tube type) pressure stroke converter.

[0019] In this embodiment, if Figure 1 As shown, one end of the U-shaped metal sheet 206 is connected to the pressure detection tube 202, and the other end is connected to the transmission element 205, which is mainly used for temperature compensation of gas pressure detection; the additional deformation caused by thermal expansion and contraction of the pressure detection tube due to temperature changes is compensated by the U-shaped metal sheet 206, ensuring that the pressure detection tube 202 accurately reflects the changes in the gas pressure in the gas chamber of the GIS circuit breaker.

[0020] In this embodiment, if Figure 1 As shown, the transmission element 205 is connected to the pressure gauge pointer 203 and the micro switch contact 204, and is used to drive the pressure gauge pointer 203 so that the pressure gauge pointer 203 changes with the change of pressure. At the same time, when the sensed air pressure reaches the set threshold, the micro switch contact 204 is triggered to send out an alarm or control signal.

[0021] In this embodiment, if Figure 1 As shown, the pressure dial pointer 203 is used to display the sensed gas pressure value, and the pressure change is converted into the movement of the pointer through mechanical transmission.

[0022] In this embodiment, if Figure 1 As shown, the micro switch contact 204 is used to send out an alarm or control signal when the sensed air pressure reaches a set threshold.

[0023] Specifically, Figure 1As shown, the remote density monitor 300 is connected to the temperature sensor 100, the gas density relay 200, and the heating element 201. On the one hand, it is used to receive the temperature of the GIS circuit breaker gas chamber detected by the temperature sensor 100, and collect the internal temperature of the gas density relay 200, and compare the former temperature of the GIS circuit breaker gas chamber with the latter internal temperature of the gas density relay 200. If the former temperature is greater than the latter temperature, the heating element 201 is turned on to heat the inside of the gas density relay 200 until the temperature error between the two is within the set range and the heating is stopped; on the other hand, it is used to collect the SF6 gas pressure inside the GIS circuit breaker sensed by the gas density relay 200, and in combination with the internal temperature of the gas density relay 200, the gas pressure value is calculated through the temperature compensation formula.

[0024] Optionally, in this embodiment, if Figure 1 As shown, the remote density monitor 300 includes: a pressure sensor 301 , a temperature sensor 302 , and a collection and control board 303 .

[0025] In this embodiment, if Figure 1 As shown, the pressure sensor 301 is connected to the pressure detection tube 202 to detect the air pressure in the pressure detection tube 202 and feed it back to the collection and control board 303.

[0026] In this embodiment, if Figure 1 As shown, the temperature sensor 2 302 is connected to the gas density relay 200 to detect the internal temperature of the gas density relay 200 and feed it back to the acquisition and control board 303 .

[0027] In this embodiment, if Figure 1 As shown, the acquisition and control board 303 is connected to the pressure sensor 301, the temperature sensor 100, the temperature sensor 2 302 and the heating element 201. On the one hand, it is used to receive the temperature of the GIS circuit breaker gas chamber detected by the temperature sensor 100 and the internal temperature of the gas density relay 200 detected by the temperature sensor 2 302, and compare the former temperature of the GIS circuit breaker gas chamber with the latter internal temperature of the gas density relay 200. If the former temperature is greater than the latter temperature, the heating element 201 is turned on to heat the inside of the gas density relay 200 until the temperature error between the two is within the set range and the heating is stopped; on the other hand, it is used to collect the SF gas pressure inside the GIS circuit breaker sensed by the gas density relay 200, and in combination with the internal temperature of the gas density relay 200, calculate the gas pressure value at an equivalent temperature of 20 degrees through the temperature compensation formula.

[0028] Optionally, in this embodiment, if Figure 1As shown, the remote transmission density monitor 300 further includes: a remote transmission module 304, which is connected to the acquisition and control board 303 and is used to transmit the gas pressure value at an equivalent temperature of 20 degrees calculated by the acquisition and control board 303 to the background system.

[0029] Control logic description of a low-error GIS circuit breaker gas density monitoring device: When the temperature is relatively low, in order to prevent the SF6 gas in the gas chamber of the GIS circuit breaker from liquefying, it is necessary to start the circuit breaker heating tape to heat the GIS circuit breaker gas chamber; Due to the heating, the temperature in the gas chamber of the GIS circuit breaker is different from the temperature at the location of the gas density relay 200. If no measures are taken, the gas density relay 200 will perform temperature compensation based on the temperature of the environment in which it is located. Then the test result will not correctly reflect the pressure of the gas in the gas chamber of the GIS circuit breaker, and the test is invalid. Therefore, at this time, it is also necessary to heat the inside of the gas density relay 200 to make its temperature the same as the temperature of the circuit breaker gas chamber to achieve a temperature compensation effect, so that the detection result can accurately reflect the pressure of the GIS circuit breaker gas chamber.

[0030] As described above, according to a low-error GIS circuit breaker gas density monitoring device of an embodiment of the present invention, the current temperature information of the GIS circuit breaker gas chamber is monitored in real time through the temperature sensor 100 and fed back to the acquisition and control board 303. After receiving these data, the acquisition and control board 303 will accurately adjust the working state of the heating element 201. This regulation process is intended to adjust the temperature inside the gas density relay 200 to keep it within a preset error range with the temperature of the GIS circuit breaker gas chamber. Such a design cleverly solves the problem of inaccurate measurement caused by the possible failure of the temperature compensation mechanism in a low temperature environment. Therefore, even under extremely low temperature conditions, the system can ensure accurate and correct detection of the gas pressure in the GIS circuit breaker gas chamber.

[0031] The above combined with Figure 1 A low-error GIS circuit breaker gas density monitoring device according to an embodiment of the present invention is described. Further, the present invention can also be applied to a low-error GIS circuit breaker gas density monitoring method.

[0032] like Figure 2 As shown, according to another embodiment of the present invention, a low-error GIS circuit breaker gas density monitoring method is provided, comprising the following steps: like Figure 2 As shown, in S1, when the temperature is relatively low, in order to prevent the SF6 gas in the gas chamber of the GIS circuit breaker from liquefying, it is necessary to start the GIS circuit breaker heating tape to heat the GIS circuit breaker gas chamber.

[0033] like Figure 2 As shown, in S2, the temperature of the GIS circuit breaker gas chamber and the internal temperature of the gas density relay 200 are collected. By comparison, if the former temperature is greater than the latter temperature, the heating element 201 is turned on to heat the inside of the gas density relay 200 until the temperature error between the two is within the set range and the heating is stopped.

[0034] like Figure 2 As shown, in S3, the gas density relay 200 performs pressure detection at the heated temperature by the pressure detection tube 202 and the U-shaped metal sheet, and the transmission element 205 drives the pressure dial pointer 203 and the micro switch contact 204 to correctly display the GIS circuit breaker air chamber pressure value and correctly output the contact signal.

[0035] like Figure 2 As shown, in S4, the acquisition and control board 303 of the remote density monitor 300 receives the pressure in the pressure detection tube 202 detected by the pressure sensor 301 and the internal temperature of the gas density relay 200 detected by the temperature sensor 202, and calculates the gas pressure value at an equivalent temperature of 20 degrees through the temperature compensation formula. At the same time, the gas pressure value is transmitted to the background system through the remote transmission module 304.

[0036] like Figure 2 As shown, in S5, the above steps S1 to S4 are continuously cycled and repeatedly executed.

[0037] Above, refer to Figure 2 A low-error GIS circuit breaker gas density monitoring method according to an embodiment of the present invention is described. The current temperature information of the GIS circuit breaker gas chamber is monitored in real time by a temperature sensor 100 and fed back to the acquisition and control board 303. After receiving these data, the acquisition and control board 303 will accurately adjust the working state of the heating element 201. This regulation process is intended to adjust the temperature inside the gas density relay 200 to keep it within a preset error range with the temperature of the GIS circuit breaker gas chamber. Such a design cleverly solves the problem of inaccurate measurement caused by the possible failure of the temperature compensation mechanism in a low temperature environment. Therefore, even under extreme low temperature conditions, the system can ensure accurate and correct detection of the gas pressure in the GIS circuit breaker gas chamber.

[0038] It should be noted that, in this specification, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0039] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A low-error GIS circuit breaker gas density monitoring device, characterized in that: Includes: temperature sensor 1, gas density relay and remote density monitor; The temperature sensor 1 is connected to the gas chamber of the GIS circuit breaker and is used to detect the temperature of the gas chamber of the GIS circuit breaker; The gas density relay is connected to the gas chamber of the GIS circuit breaker and is used to sense the SF6 gas pressure inside the GIS circuit breaker; a heating element is provided on the gas density relay, and the heating element is used to heat the inside of the gas density relay so that the internal temperature of the gas density relay and the temperature of the gas chamber of the GIS circuit breaker are within a set range; The remote density monitor is connected to the temperature sensor 1, the gas density relay and the heating element. On the one hand, it is used to receive the temperature of the GIS circuit breaker gas chamber detected by the temperature sensor 1, and collect the internal temperature of the gas density relay, and compare the former temperature of the GIS circuit breaker gas chamber with the latter internal temperature of the gas density relay. If the former temperature is greater than the latter temperature, the heating element is turned on to heat the inside of the gas density relay until the temperature error between the two is within the set range and the heating is stopped. On the other hand, it is used to collect the SF6 gas pressure inside the GIS circuit breaker sensed by the gas density relay, and calculate the gas pressure value through the temperature compensation formula in combination with the internal temperature of the gas density relay.

2. The low-error GIS circuit breaker gas density monitoring device according to claim 1 is characterized in that: The gas density relay comprises: a pressure detection tube, a U-shaped metal sheet, a transmission element, a pressure dial pointer and a micro switch contact; One end of the pressure detection tube is connected to the gas supply interface of the GIS circuit breaker gas chamber, and is used to sense the SF6 gas pressure inside the GIS circuit breaker gas chamber. When the pressure changes, the pressure detection tube is deformed accordingly, thereby driving the transmission element to work; One end of the U-shaped metal sheet is connected to the other end of the pressure detection tube, and the other end is connected to the transmission element, so as to compensate for the additional deformation caused by thermal expansion and contraction of the pressure detection tube due to temperature changes; The transmission element is connected to the pressure gauge pointer and the micro switch contact, and is used to drive the pressure gauge pointer so that the pressure gauge pointer changes with the pressure change. At the same time, when the sensed air pressure reaches a set threshold, the micro switch contact is triggered to send out an alarm or control signal. The pressure dial pointer is used to display the sensed gas pressure value; The micro switch contacts are used to send out an alarm or control signal when the sensed air pressure reaches a set threshold value.

3. The low-error GIS circuit breaker gas density monitoring device according to claim 2, characterized in that: The remote density monitor comprises: a pressure sensor, a second temperature sensor and a collection and control board; The pressure sensor is connected to the pressure detection tube and is used to detect the air pressure in the pressure detection tube; The temperature sensor 2 is connected to the gas density relay and is used to detect the internal temperature of the gas density relay; The acquisition and control board is connected to the pressure sensor, the temperature sensor 1, the temperature sensor 2 and the heating element. On the one hand, it is used to receive the temperature of the GIS circuit breaker gas chamber detected by the temperature sensor 1 and the internal temperature of the gas density relay detected by the temperature sensor 2, and compare the former temperature of the GIS circuit breaker gas chamber with the latter internal temperature of the gas density relay. If the former temperature is greater than the latter temperature, the heating element is turned on to heat the inside of the gas density relay until the temperature error between the two is within the set range and the heating is stopped; on the other hand, it is used to collect the SF gas pressure inside the GIS circuit breaker sensed by the gas density relay, and in combination with the internal temperature of the gas density relay, calculate the gas pressure value equivalent to 20 degrees through the temperature compensation formula.

4. The low-error GIS circuit breaker gas density monitoring device as claimed in claim 3, characterized in that: The remote transmission density monitor further comprises: a remote transmission module, which is connected to the acquisition and control board and is used to transmit the gas pressure value at an equivalent temperature of 20 degrees calculated by the acquisition and control board to the background system.

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