1. The utility model provides a safe monitoring devices of transformer oil level operation based on wireless communication which characterized in that includes: a background management system, a communication module, a main controller, an information collector and an ultrasonic oil level sensor, wherein,

the ultrasonic oil level sensor sends modulated ultrasonic waves, and echoes generated by reflection of the modulated ultrasonic waves on the interface between the transformer oil and gas, a vacuum environment or solid are received by the ultrasonic oil level sensor to generate data signals;

the information collector collects data signals from the ultrasonic oil level sensor, amplifies the data signals and transmits the amplified data signals to the main controller;

the main controller performs algorithm processing on the data signals to obtain detection data and transmits the detection data to the background management system through the communication module;

and the background management system compares the detection data with prestored data, judges whether the oil level state has risk or not, and calculates the residual service life according to the detection data.

2. The device for monitoring the operational safety of the oil level of the transformer based on the wireless communication as claimed in claim 1, further comprising: the power supply system is connected with the main controller and the information collector and used for supplying power; and a portable battery electrically connected to the power supply system.

3. The device for monitoring the operational safety of the oil level of the transformer based on the wireless communication as claimed in claim 1, further comprising: the alarm equipment is connected with the main controller;

the background management system sends the remaining service life and the oil level state to the main controller through the communication module;

and the main controller sends an alarm through the alarm device when the oil level state has a risk.

4. The apparatus for monitoring the operational safety of the oil level of the transformer based on the wireless communication as claimed in claim 1, wherein the pre-stored data comprises a previous measured value, a preset alarm threshold value and a ratio of the volume of the rise/time.

5. The device for monitoring the safety of operation of the oil level of the transformer based on the wireless communication as claimed in claim 1, wherein the communication module comprises NB-IOT, LORA, WIFI, Bluetooth, ZigBee, 2G, 3G or 4G wireless communication modes.

6. The monitoring device for the safety in operation of the oil level of the transformer based on the wireless communication as claimed in claim 1, wherein after the background management system receives the detection data H of the oil level at regular time, the background management system calculates the normally consumed oil level H2 within the time T according to the time difference T between the current measurement and the last measurement, and compares whether the difference value between H and H2 meets the ratio of the rise/time consumption; if the comparison value is not accordant, the comparison with the previous measured value needs to be carried out for 3 times again, and if the detection results of the 3 times are consistent, the detection abnormality is prompted; judging whether the alarm threshold is reached or not after the comparison is finished, outputting oil level exhaustion alarm information according to data lower than a preset alarm threshold; and calculating the residual service time according to the data meeting the preset alarm threshold value through H/T, and updating the detection data H to the system for next comparison work.

Background

At present, more and more transformer substations are unattended, if the oil level which is very important for transformer operation is displayed inaccurately or an advanced early warning mechanism is lacked, the state perception reliability of core transformer equipment is low, and along with the definition of the concept of 'preventing from being in the bud' in the construction of smart grids and ubiquitous power internet of things, the early warning monitoring mechanism of the oil level of the transformer is concerned.

Oil level gauges are important monitoring devices for oil-filled electrical equipment such as transformers, and tube type and pointer type oil level gauges are commonly used. The phenomenon that the oil level gauges are inaccurate in display and even invalid can occur after the two oil level gauges are operated for a long time, the oil level gauges are commonly called as false oil levels, and great harm is brought to operation of oil-immersed electrical equipment such as transformers. The oil level of the conservator is detected by two modes of horizontal glass tube indication or metal floating ball type oil level gauge, wherein the former principle is the pressure balance principle of a U-shaped liquid level gauge, the latter principle is that a floating ball connecting rod causes magnetic force change and finally causes gauge needle change, and the two modes belong to pure mechanical structures and can be detected by directly contacting with transformer oil. Therefore, an improved scheme is provided for the existing oil conservator oil level detection device, and the technical problem to be solved in the industry at present is solved.

Disclosure of Invention

The invention aims to provide a monitoring device for the running safety of the oil level of a transformer based on wireless communication, which realizes non-contact measurement of the oil level of an oil conservator of the transformer and judges the remaining service life of the oil level.

The technical scheme for realizing the purpose is as follows:

a monitoring device for safe operation of a transformer oil level based on wireless communication comprises: a background management system, a communication module, a main controller, an information collector and an ultrasonic oil level sensor, wherein,

the ultrasonic oil level sensor sends modulated ultrasonic waves, and echoes generated by reflection of the modulated ultrasonic waves on the interface between the transformer oil and gas, a vacuum environment or solid are received by the ultrasonic oil level sensor to generate data signals;

the information collector collects data signals from the ultrasonic oil level sensor, amplifies the data signals and transmits the amplified data signals to the main controller;

the main controller performs algorithm processing on the data signals to obtain detection data and transmits the detection data to the background management system through the communication module;

and the background management system compares the detection data with prestored data, judges whether the oil level state has risk or not, and calculates the residual service life according to the detection data.

Preferably, the method further comprises the following steps: the power supply system is connected with the main controller and the information collector and used for supplying power; and a portable battery electrically connected to the power supply system.

Preferably, the method further comprises the following steps: the alarm equipment is connected with the main controller;

the background management system sends the remaining service life and the oil level state to the main controller through the communication module;

and the main controller sends an alarm through the alarm device when the oil level state has a risk.

Preferably, the pre-stored data comprises a previous measurement value, a preset alarm threshold value and a rise/time usage ratio.

Preferably, the communication module comprises NB-IOT, LORA, WIFI, Bluetooth, ZigBee, 2G, 3G or 4G wireless communication modes.

Preferably, after the background management system receives the detection data H of the oil level at regular time, the background management system calculates the normal oil level consumed H2 within the time T according to the time difference T between the current measurement and the last measurement, and compares whether the difference value between H and H2 meets the ratio of the rise/time usage amount; if the comparison value is not accordant, the comparison with the previous measured value needs to be carried out for 3 times again, and if the detection results of the 3 times are consistent, the detection abnormality is prompted; judging whether the alarm threshold is reached or not after the comparison is finished, outputting oil level exhaustion alarm information according to data lower than a preset alarm threshold; and calculating the residual service time according to the data meeting the preset alarm threshold value through H/T, and updating the detection data H to the system for next comparison work.

The invention has the beneficial effects that: the method is based on the characteristic that the ultrasonic waves are reflected on medium interfaces with different acoustic impedance ratios, and realizes non-contact measurement of the oil level of the transformer conservator. The fixed-point detection can be realized, and different points can be continuously detected. The device can be fixedly installed in a positioning mode and remotely controlled, and can also be used for mobile temporary detection. The invention can systematically maintain and record the monitored oil level of the transformer and judge the service life of the oil level allowance.

Drawings

FIG. 1 is a block diagram of a wireless communication based monitoring device for the operational safety of the oil level of a transformer according to the present invention;

fig. 2 is a schematic diagram of a process of data processing performed by the background management system in the present invention.

Detailed Description

The invention will be further explained with reference to the drawings.

Referring to fig. 1, the monitoring device for the safety of the oil level operation of the transformer based on wireless communication according to the present invention includes: background management system 1, communication module 2, main control unit 3, information collector 4, ultrasonic wave oil level sensor 5, power supply system 6, portable battery 7 and alarm device 8.

The ultrasonic oil level sensor 5 sends modulated ultrasonic waves, echoes generated by reflection of the ultrasonic waves at the interface between the transformer oil and gas, a vacuum environment or a solid (such as a capsule of an oil conservator) are received by the ultrasonic oil level sensor 3, and data signals are generated.

And the information acquisition device 4 acquires data signals from the ultrasonic oil level sensor 5, amplifies the data signals and transmits the amplified data signals to the main controller 3. The main controller 3 performs algorithm processing on the data signal (performs denoising processing on the data signal under the condition that the data is greater than 0), obtains detection data, and transmits the detection data to the background management system 1 through the communication module 2. The background management system 1 compares the detection data with the prestored data to judge whether the oil level state has risks or not, and calculates the remaining service life according to the detection data. Specifically, as shown in fig. 2, after the background management system 1 receives the detection data H of the oil level at regular time, the background management system calculates the normal oil level consumed H2 within the time T according to the time difference T between the current measurement and the last measurement, and it is in accordance with the ratio of the rise/time usage when the difference between H and H2 is smaller than the error value by 3.8%; if the comparison value is not matched, in order to prevent the occurrence of false alarm, the comparison with the database data (the early-stage measured value) needs to be carried out for 3 times again, and if the detection results of the 3 times are consistent, the abnormal detection is prompted. Judging whether the alarm threshold is reached or not after the comparison is finished, outputting oil level exhaustion alarm information according to data lower than a preset alarm threshold; and calculating the residual service time according to the data meeting the preset alarm threshold value through H/T, and updating the detection data H to the system for next comparison work.

The pre-stored data comprises a previous-stage measurement value, a preset alarm threshold value and a rise/time usage ratio. So as to monitor the conservator oil quantity of the transformer in real time. The remaining usage period is equal to the total time period minus the actual usage period. When the actual use time tested within 24 hours is jittered abnormally, a user is prompted to pay attention to uncertain factors such as oil leakage and severe environmental temperature change in time.

And the power supply system 6 is connected with the main controller 3 and the information collector 4 and used for supplying power. The portable battery 7 is electrically connected to the power supply system 6. The communication module 2 comprises NB-IOT, LORA, WIFI, Bluetooth, ZigBee, 2G, 3G or 4G wireless communication modes.

The background management system 1 sends the remaining service life and the oil level state to the main controller 3 through the communication module 2; the main controller 3 sends an alarm through the alarm device 8 when there is a risk of the oil level condition. Each circuit or component of this embodiment can adopt any existing circuit or component with similar function according to actual conditions, on the basis of realizing the system structure and function of whole detector, reduces the cost of whole detector and guarantees the security, the accuracy nature of detector.

The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.