Main transformer capsule oil conservator oil level checking device

Abstract

The utility model relates to an oil level checking device for a main transformer capsule oil conservator. The transformer oil conservator oil level gauge can display the real position of the oil level in a transformer oil conservator and verify the oil conservator oil level gauge. According to the technical scheme, the device comprises a pressure sensor and a laser range finder which are connected through an RS485. The pressure sensor comprises a pressure transmitter and a DC-DC voltage reduction module which are electrically connected with the RS485 wireless module. The laser range finder comprises a control system, a laser range finder, a three-dimensional electronic compass and a DC-DC step-down module which are electrically connected with the RS485 wireless module respectively; the laser range finder measures the distance between the laser range finder and the main transformer expansion tank and the distance between the laser range finder and the pressure sensor, and transmits the distances to a control system of the laser range finder; the three-dimensional electronic compass measures the included angle between the plane where the base of the laser range finder is located and the horizontal plane and transmits the included angle to a control system of the laser range finder. The pressure transmitter obtains the pressure value of the oil outlet of the main transformer through measurement and transmits the pressure value to the control system.

Description

Technical Field

[0001] The utility model relates to the technical field of oil storage device calibration, in particular to an oil level calibration device for the main transformer capsule oil conservator. Background Art

[0002] The oil conservator is an important oil storage device widely used in power transformers. The oil conservator can isolate the direct contact between the insulating oil and the air, prevent the insulating oil from getting damp, and slow down the deterioration rate of the insulating oil. Therefore, the good operation state of the oil conservator is crucial for the safe and stable operation of the transformer. According to operation experience, problems such as false oil level caused by oil level gauge failure bring uncertain factors to the safe operation of the transformer. The commonly used oil level detection methods at present are infrared temperature measurement method and sonar detection method.

[0003] The infrared temperature measurement method determines the oil level height by observing with the naked eye according to the difference between the temperature of the transformer oil during operation and the temperature of the air in the capsule. The problems it has are: since the infrared temperature measurement is affected by the external environment, this method cannot be used on the direct sunlight side, and it has relatively high requirements for the operation experience of personnel using infrared temperature measurement, such as what time to use what temperature difference, etc., which brings limitations to the measurement.

[0004] The sonar detection method determines the specific height of the oil level by the different reflection waves of ultrasonic waves in two different media of transformer oil and air, forming different images; the problems it has are: the cost is relatively high, and since the ultrasonic probe is close to the outer wall of the oil conservator, the gap needs to be filled with special materials, and non-professional personnel cannot operate well, and it has a high dependence on professional personnel. Content of the Utility Model

[0005] In view of this, the utility model provides an oil level calibration device for the main transformer capsule oil conservator, which can display the true position of the oil surface in the transformer oil conservator and calibrate the oil level gauge of the oil conservator.

[0006] In order to solve the problems existing in the prior art, the technical solution of the utility model is: an oil level calibration device for the main transformer capsule oil conservator, including a pressure sensor and a laser rangefinder connected by RS485;

[0007] The pressure sensor includes a pressure transmitter and a DC-DC buck module, and the pressure transmitter and the DC-DC buck module are respectively electrically connected to the RS485 wireless module;

[0008] The laser rangefinder includes a control system, a laser rangefinder, a three-dimensional electronic compass, and a DC-DC buck module, and the control system, the laser rangefinder, the three-dimensional electronic compass, and the DC-DC buck module are respectively electrically connected to the RS485 wireless module;

[0009] The described laser rangefinder is electrically connected to the control system, measures the distances between the laser rangefinder and the main transformer conservator and between the laser rangefinder and the pressure sensor, and transmits them to the control system of the laser rangefinder;

[0010] The described three-dimensional electronic compass is electrically connected to the control system, measures the angle between the plane where the laser rangefinder base is located and the horizontal plane, and transmits it to the control system of the laser rangefinder;

[0011] The described pressure transmitter is electrically connected to the control system, obtains the pressure value at the main transformer oil drain port through measurement, and transmits it to the control system.

[0012] Furthermore, the pressure sensor also includes a battery, and the battery supplies power to the pressure transmitter and the DC-DC buck module respectively.

[0013] Furthermore, the laser rangefinder also includes a battery, and the battery supplies power to the control system, the laser rangefinder, the three-dimensional electronic compass, and the DC-DC buck module respectively.

[0014] Furthermore, the model of the control system is TPC4023Ei.

[0015] Compared with the prior art, the advantages of the present utility model are as follows:

[0016] 1. By adopting the structure of the present utility model, a new method for indicating the position of the oil level in the conservator can be realized, which is not affected by the external environment and can accurately indicate the oil level height in the conservator.

[0017] 2. The present utility model is simple to operate, easy to get started, and has low dependence on personnel.

[0018] 3. The cost of the present utility model is controllable and the economic pressure is small.

[0019] 4. Compared with the infrared temperature measurement method, the present utility model is not affected by temperature in summer and has high accuracy in collecting data.

[0020] 5. When the present utility model is used, only the laser rangefinder needs to be rotated up and down to change the position of the red dot emitted by the laser. Compared with the sonar detection method, the sonar method requires professional personnel to handle the gap problem between the probe and the surface of the main transformer conservator. This device is simple to operate and can be used by non-experienced people, and there is no limitation on the user group. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the present utility model.

[0022] Figure 2 It is a measurement diagram of the working principle of the present utility model.

[0023] Figure 3 It is a schematic diagram of the vertical cross-section principle of the main transformer conservator.

[0024] 1-laser rangefinder, 2-main transformer oil pillow, 3-pressure sensor, 4-laser rangefinder tripod, 5-main transformer, 6-upper edge of main transformer oil pillow height, 7-lower edge of main transformer oil pillow height, 8-transformer oil drain port. DETAILED DESCRIPTION

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The utility model discloses a main transformer capsule oil conservator oil level calibration device, comprising a pressure sensor and a laser range finder, wherein the pressure sensor and the laser range finder realize wireless communication through an RS485 wireless module;

[0028] The pressure sensor includes a pressure transmitter, a DC-DC buck module and a battery. The pressure transmitter and the DC-DC buck module are electrically connected to the RS485 wireless module respectively, and the battery supplies power to the pressure transmitter and the DC-DC buck module respectively.

[0029] The laser rangefinder comprises a control system, a laser rangefinder, a three-dimensional electronic compass, a DC-DC buck module and a battery. The control system, the laser rangefinder, the three-dimensional electronic compass and the DC-DC buck module are electrically connected to the RS485 wireless module respectively; the battery supplies power to the control system, the laser rangefinder, the three-dimensional electronic compass and the DC-DC buck module respectively, and the model of the control system is TPC4023Ei.

[0030] The pressure transmitter is electrically connected to the control system, obtains the pressure value of the oil drain port of the main transformer by measurement, and transmits it to the control system of the laser rangefinder;

[0031] The described laser rangefinder is electrically connected to the control system, measures the distance between the laser rangefinder 1 and the main transformer conservator 2 and the distance between the laser rangefinder 1 and the pressure sensor 3, and transmits them to the control system of the laser rangefinder;

[0032] The described three-dimensional electronic compass is electrically connected to the control system. The three-dimensional electronic compass measures the angle between the plane where the laser rangefinder base is located and the horizontal plane and transmits it to the control system of the laser rangefinder;

[0033] The DC-DC buck module of the laser rangefinder converts the 24V voltage into 5V voltage to power the RS485 wireless module.

[0034] The DC-DC buck module of the pressure sensor converts the 12V voltage into 5V voltage to power the RS485 wireless module.

[0035] The pressure transmitter used in the pressure sensor of the present utility model has a measuring range of 0 - 100KPa and an accuracy of 0.1% FS. After calculation by the pressure formula, the height error is within 5mm.

[0036] The accuracy of the laser rangefinder and the laser distance meter of the present utility model: ±1mm; the three-dimensional electronic compass, accuracy: 0.01°

[0037] Through mathematical calculation, the height error is ±1CM.

[0038] The height of the main transformer conservator of the present utility model is 80CM - 150CM, and the middle value is taken as 115CM, with an overall error < 1%.

[0039] The usage method of the present utility model is as Figure 2 and Figure 3 shown:

[0040] This set of system consists of two parts: the pressure sensor 3 and the laser rangefinder 1. The main transformer conservator 2 is connected to the main transformer 5, and the main transformer conservator 2 is located above the main transformer 5;

[0041] First, the pressure sensor 3 obtains the pressure P at the oil discharge port of the main transformer 5 and transmits it to the human-machine interface control system of the laser rangefinder 1 through the RS485 communication Modbus RTU protocol.

[0042] The human-machine interface control system uses H = P / (ρg) to calculate the height H. H is the depth from the oil surface to the pressure sensor, ρ is the density of the transformer oil, and g is the local acceleration due to gravity;

[0043] The laser rangefinder 1 can measure the distance L between the laser rangefinder 1 and the conservator of the main transformer. There is a 3D electronic compass in the laser rangefinder 1. The 3D electronic compass measures the angle α between the laser rangefinder 1 and the horizontal plane. According to the sine function, the height H1 from the laser red dot to the horizontal plane of the device is calculated, H1 = L * Sinα;

[0044] The 3D electronic compass can also correct the laser rangefinder itself, making the laser tester 1 in a horizontal state.

[0045] In the same way, the height difference H2 between the laser rangefinder 1 and the pressure sensor 3 can be calculated, H2 = L2 * Sinβ.

[0046] According to the pressure P of the pressure sensor 3, the oil level height H in the conservator is calculated. The hand crank of the laser rangefinder tripod is used to adjust the up and down rotation angle of the laser rangefinder 1 so that H1 + H2 = H.

[0047] According to the laser red dot, the oil level position inside the conservator can be displayed outside the conservator.

[0048] To further simplify the recognition process, the laser rangefinder 1 measures the height H of the lower edge 7 of the height of the conservator of the main transformer 下 and the height H of the upper edge 6 of the height of the conservator of the main transformer 上 .

[0049] The oil level position in the conservator 2 of the main transformer relative to the height H3 of the lower edge 7 of the height of the conservator of the main transformer ( Figure 3 ).

[0050] H3 = H 下 -H2

[0051] The height H4 of the conservator 2 of the main transformer ( Figure 3 ): H4 = H 上 -H 下

[0052] Then the proportion of the oil level height in the conservator 2 of the main transformer: H3 / H4, is visually represented on the man-machine interface control system.

[0053] Note: This utility model transformer includes two types, one is the main transformer, and the other is the standby transformer. Both transformers include conservators. The conservator of the main transformer is called the conservator of the main transformer.

[0054] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A main transformer capsule oil conservator oil level calibration device, characterized in that It includes a pressure sensor and a laser rangefinder connected via RS485; The pressure sensor (3) includes a pressure transmitter and a DC-DC buck module, and the pressure transmitter and the DC-DC buck module are respectively electrically connected to the RS485 wireless module; The laser rangefinder (1) includes a control system, a laser rangefinder, a three-dimensional electronic compass, and a DC-DC buck module. The control system, the laser rangefinder, the three-dimensional electronic compass, and the DC-DC buck module are respectively electrically connected to the RS485 wireless module; The laser rangefinder is electrically connected to the control system, measures the distance between the laser rangefinder (1) and the main transformer conservator (2) and the distance between the laser rangefinder (1) and the pressure sensor (3), and transmits them to the control system of the laser rangefinder; The three-dimensional electronic compass is electrically connected to the control system, measures the angle between the plane where the laser rangefinder base is located and the horizontal plane, and transmits it to the control system of the laser rangefinder; The pressure transmitter is electrically connected to the control system, obtains the pressure value of the main transformer oil drain port through measurement, and transmits it to the control system.

2. The main transformer capsule oil conservator oil level calibration device according to claim 1, characterized in that, The pressure sensor also includes a battery, and the battery supplies power to the pressure transmitter and the DC-DC buck module respectively.

3. The main transformer capsule oil conservator oil level calibration device according to claim 1 or 2, characterized in that The laser rangefinder also includes a battery, and the battery supplies power to the control system, the laser rangefinder, the three-dimensional electronic compass, and the DC-DC buck module respectively.

4. A main transformer capsule oil conservator oil level calibration device according to claim 3, characterized in that, The model of the control system is TPC4023Ei.

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