Device for detecting oil level of transformer oil tank

Abstract

The invention provides a transformer oil tank oil level detection device which comprises a first ultrasonic sensor, a second ultrasonic sensor and a controller. The first ultrasonic sensor is arranged at the top end of the transformer oil tank, the second ultrasonic sensor is arranged at the bottom end of the transformer oil tank, and the position between the first ultrasonic sensor and the second ultrasonic sensor is symmetrical about the horizontal axis of the transformer oil tank; the first ultrasonic sensor and the second ultrasonic sensor are electrically connected with the controller. And the controller is used for acquiring the ultrasonic signals transmitted and received by the first ultrasonic sensor and the second ultrasonic sensor, determining the height of a medium in the transformer oil tank according to the ultrasonic signals, and outputting the height of the medium as an oil level value. The actual height of the oil level of the transformer is accurately and reliably tested, so that whether the oil level meets the operation condition of the transformer or not is judged.

Description

Technical Field

[0001] The invention relates to the technical field of transformer oil tank oil level detection, in particular to a transformer oil tank oil level detection device. Background Art

[0002] For transformers in use, transformer oil is equivalent to transformer blood. When an abnormal oil level (high or low oil level) signal appears, or when the oil level does not change during oil filling or oil draining, the safe and stable operation of the transformer will be threatened. Usually, it is necessary to manually verify the actual oil level of the transformer to confirm whether the signal and the oil level gauge send a signal by mistake. The traditional mode is usually to install a valve at the bottom valve of the transformer to connect a transparent pipeline, and the actual oil level height of the pipeline is the actual oil level height of the transformer. This solution is relatively cumbersome and requires a valve that matches the main transformer valve to drain the oil. And manually lift the oil pipe to test the oil level. Since the transformer is very high and there is high voltage electricity around it, manual operation has certain risks, and because there is air in the pipeline, the test may not be accurate enough. Summary of the invention

[0003] The purpose of the present invention is to provide a device for detecting the oil level of a transformer tank, so as to solve the technical problem of how to simply and accurately detect the oil level of the transformer tank.

[0004] On the one hand, a device for detecting the oil level of a transformer tank is provided, comprising:

[0005] A first ultrasonic sensor, a second ultrasonic sensor and a controller;

[0006] The first ultrasonic sensor is arranged at the top end of the transformer oil tank, and the second ultrasonic sensor is arranged at the bottom end of the transformer oil tank. The positions of the first ultrasonic sensor and the second ultrasonic sensor are symmetrical to the horizontal axis of the transformer oil tank. The first ultrasonic sensor and the second ultrasonic sensor are electrically connected to the controller respectively.

[0007] The controller is used to obtain the ultrasonic signals emitted and received by the first ultrasonic sensor and the second ultrasonic sensor, determine the medium height in the transformer oil tank according to the ultrasonic signals, and output the medium height as an oil level value.

[0008] Preferably, the controller is specifically used to detect the ultrasonic signal emitted by the second ultrasonic sensor, record the first moment when the ultrasonic signal reaches the inner wall of the oil tank, record the second moment when the ultrasonic signal reaches the oil level of the oil pillow transformer, and record the third moment when the ultrasonic signal reaches the upper inner wall of the oil tank.

[0009] Preferably, the controller is further used to determine the difference between the second moment and the first moment and the difference between the third moment and the first moment;

[0010] The result of multiplying the transmission speed of the ultrasonic signal in the medium in the transformer oil tank by half of the difference between the second moment and the first moment is output as the oil level height value;

[0011] The result of multiplying the transmission speed of the ultrasonic signal in the medium in the transformer oil tank by half of the difference between the third moment and the first moment is output as the oil tank height value.

[0012] Preferably, the controller is further used to determine the ratio between the oil level height value and the oil tank height value, and output the product of the ratio between the oil level height value and the oil tank height value and the conversion parameter as the first oil level value.

[0013] Preferably, the controller is also used to detect the ultrasonic signal emitted by the first ultrasonic sensor, record the fourth moment when the ultrasonic signal reaches the inner wall of the oil tank, record the fifth moment when the ultrasonic signal reaches the oil level of the oil pillow transformer, and record the sixth moment when the ultrasonic signal reaches the lower inner wall of the oil tank.

[0014] Preferably, the controller is further used to determine the difference between the sixth moment and the fifth moment and the difference between the sixth moment and the fifth moment;

[0015] The result of multiplying the transmission speed of the ultrasonic signal in the medium in the transformer oil tank by half of the difference between the sixth moment and the fifth moment is output as the oil level height value;

[0016] The result of multiplying the transmission speed of the ultrasonic signal in the medium in the transformer oil tank by half of the difference between the sixth moment and the fifth moment is output as the oil tank height value.

[0017] Preferably, the controller is further used to determine the ratio between the oil level height value and the oil tank height value, and output the product of the ratio between the oil level height value and the oil tank height value and the conversion parameter as the second oil level value.

[0018] Preferably, the controller is further used to compare the first oil level value and the second oil level value, and if the first oil level value is consistent with the second oil level value, output a final oil level value.

[0019] In summary, the implementation of the embodiments of the present invention has the following beneficial effects:

[0020] The device for detecting the oil level of a transformer oil tank provided by the present invention installs two ultrasonic sensors at symmetrical points at the topmost end of the transformer oil pillow and the bottommost end of the transformer oil pillow, and tests the time of the medium through ultrasonic signal transmission and reception, thereby calculating the height of the medium; the two sensors measure simultaneously and verify each other, thereby accurately and reliably testing the actual height of the transformer oil level, thereby judging whether the oil level meets the transformer operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0022] Figure 1 The figure is a schematic diagram of a device for detecting the oil level of a transformer tank according to an embodiment of the present invention.

[0023] Figure 2 The figure is a schematic diagram of a device for detecting the oil level of a transformer tank according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] like Figure 1 and Figure 2 FIG. 1 is a schematic diagram of an embodiment of a transformer oil tank oil level detection device provided by the present invention. In this embodiment, it includes:

[0026] The first ultrasonic sensor 3, the second ultrasonic sensor 2 and the controller; the first ultrasonic sensor 3 is arranged at the top of the transformer oil tank 1, the second ultrasonic sensor 2 is arranged at the bottom of the transformer oil tank 1, and the position between the first ultrasonic sensor 3 and the second ultrasonic sensor 2 is symmetrical to the horizontal axis of the transformer oil tank 1; the first ultrasonic sensor 3 and the second ultrasonic sensor 2 are electrically connected to the controller respectively; the controller is used to obtain the ultrasonic signals emitted and received by the first ultrasonic sensor 3 and the second ultrasonic sensor 2, and determine the medium height in the transformer oil tank 1 according to the ultrasonic signals, and output the medium height as the oil level value. It can be understood that two ultrasonic sensors are installed symmetrically at the top and the bottom of the transformer oil pillow. The time of the medium is tested by transmitting and receiving ultrasonic signals, so as to calculate the height of the medium.

[0027] In one embodiment, the controller is specifically used to detect the ultrasonic signal emitted by the second ultrasonic sensor 2, record the first moment when the ultrasonic signal reaches the inner wall of the oil tank, record the second moment when the ultrasonic signal reaches the oil level of the oil pillow transformer, and record the third moment when the ultrasonic signal reaches the upper inner wall of the oil tank. The controller is also used to determine the difference between the second moment and the first moment and the difference between the third moment and the first moment; multiply the transmission speed value of the ultrasonic signal in the medium in the transformer oil tank 1 by half of the difference between the second moment and the first moment and output the result as the oil level height value; multiply the transmission speed value of the ultrasonic signal in the medium in the transformer oil tank 1 by half of the difference between the third moment and the first moment and output the result as the oil tank height value.

[0028] The controller is also used to determine the ratio between the oil level height value and the oil tank height value, and output the product of the ratio between the oil level height value and the oil tank height value and the conversion parameter as the first oil level value. It can be understood that the bottom ultrasonic sensor sends out an ultrasonic signal, receives T1 when it reaches the outer wall of the oil tank, receives T2 when it reaches the inner wall of the oil tank, returns T3 signal when it reaches the oil level of the oil pillow transformer, and returns T4 signal when it reaches the upper inner wall of the oil tank.

[0029] (V334)*(T3-T2) / 2 = Oil level

[0030] (V334)*(T4-T2) / 2=Fuel tank height

[0031] 10*oil level height / oil tank height = oil level.

[0032] In one embodiment, the controller is also used to detect the ultrasonic signal emitted by the first ultrasonic sensor 3, record the fourth moment when the ultrasonic signal reaches the inner wall of the oil tank, record the fifth moment when the ultrasonic signal reaches the oil level of the oil pillow transformer, and record the sixth moment when the ultrasonic signal reaches the lower inner wall of the oil tank. The controller is also used to determine the difference between the sixth moment and the fifth moment and the difference between the sixth moment and the fifth moment; multiply the transmission speed value of the ultrasonic signal in the medium in the transformer oil tank 1 by half of the difference between the sixth moment and the fifth moment and output the result as the oil level height value; multiply the transmission speed value of the ultrasonic signal in the medium in the transformer oil tank 1 by half of the difference between the sixth moment and the fifth moment and output the result as the oil tank height value.

[0033] The controller is also used to determine the ratio between the oil level value and the oil tank height value, and output the product of the ratio between the oil level value and the oil tank height value and the conversion parameter as a second oil level value. The top ultrasonic sensor can also measure the oil level using the same principle as the bottom ultrasonic sensor.

[0034] In one embodiment, the controller is further used to compare the first oil level value with the second oil level value, and if the first oil level value is consistent with the second oil level value, the final oil level value is output. It can be understood that the top ultrasonic sensor and the bottom sensor verify each other, thereby obtaining a reliable actual oil level of the transformer. When an abnormal fault occurs in the oil level gauge, the ultrasonic detection device reliably detects the transformer oil level in real time, so that the transformer can always operate reliably.

[0035] In summary, the implementation of the embodiments of the present invention has the following beneficial effects:

[0036] The device for detecting the oil level of a transformer oil tank provided by the present invention installs two ultrasonic sensors at symmetrical points at the topmost end of the transformer oil pillow and the bottommost end of the transformer oil pillow, and tests the time of the medium through ultrasonic signal transmission and reception, thereby calculating the height of the medium; the two sensors measure simultaneously and verify each other, thereby accurately and reliably testing the actual height of the transformer oil level, thereby judging whether the oil level meets the transformer operating conditions.

[0037] The above disclosure is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A device for detecting the oil level of a transformer tank, characterized in that: include: A first ultrasonic sensor, a second ultrasonic sensor and a controller; The first ultrasonic sensor is arranged at the top end of the transformer oil tank, and the second ultrasonic sensor is arranged at the bottom end of the transformer oil tank. The positions of the first ultrasonic sensor and the second ultrasonic sensor are symmetrical to the horizontal axis of the transformer oil tank. The first ultrasonic sensor and the second ultrasonic sensor are electrically connected to the controller respectively. The controller is used to obtain the ultrasonic signals emitted and received by the first ultrasonic sensor and the second ultrasonic sensor, determine the medium height in the transformer oil tank according to the ultrasonic signals, and output the medium height as an oil level value.

2. The detection device according to claim 1, characterized in that The controller is specifically used to detect the ultrasonic signal emitted by the second ultrasonic sensor, record the first moment when the ultrasonic signal reaches the inner wall of the oil tank, record the second moment when the ultrasonic signal reaches the oil level of the oil pillow transformer, and record the third moment when the ultrasonic signal reaches the upper inner wall of the oil tank.

3. The detection device according to claim 2, characterized in that: The controller is further used to determine the difference between the second moment and the first moment and the difference between the third moment and the first moment; The result of multiplying the transmission speed of the ultrasonic signal in the medium in the transformer oil tank by half of the difference between the second moment and the first moment is output as the oil level height value; The result of multiplying the transmission speed of the ultrasonic signal in the medium in the transformer oil tank by half of the difference between the third moment and the first moment is output as the oil tank height value.

4. The detection device according to claim 3, characterized in that: The controller is further used to determine the ratio between the oil level value and the oil tank height value, and output the product of the ratio between the oil level value and the oil tank height value and the conversion parameter as the first oil level value.

5. The detection device according to claim 4, characterized in that: The controller is also used to detect the ultrasonic signal emitted by the first ultrasonic sensor, record the fourth moment when the ultrasonic signal reaches the inner wall of the oil tank, record the fifth moment when the ultrasonic signal reaches the oil level of the oil pillow transformer, and record the sixth moment when the ultrasonic signal reaches the lower inner wall of the oil tank.

6. The detection device according to claim 5, characterized in that: The controller is further used to determine the difference between the sixth moment and the fifth moment and the difference between the sixth moment and the fifth moment; The result of multiplying the transmission speed of the ultrasonic signal in the medium in the transformer oil tank by half of the difference between the sixth moment and the fifth moment is output as the oil level height value; The result of multiplying the transmission speed of the ultrasonic signal in the medium in the transformer oil tank by half of the difference between the sixth moment and the fifth moment is output as the oil tank height value.

7. The detection device according to claim 6, characterized in that: The controller is further used to determine the ratio between the oil level value and the oil tank height value, and output the product of the ratio between the oil level value and the oil tank height value and the conversion parameter as a second oil level value.

8. The detection device according to claim 7, characterized in that: The controller is further configured to compare the first oil level value with the second oil level value, and output a final oil level value if the first oil level value is consistent with the second oil level value.

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