Low-voltage transformer state intelligent detection alarm device

Abstract

This application relates to the technical field of low-voltage transformer testing equipment, and in particular to an intelligent detection and alarm device for low-voltage transformer status, including a signal input module, a data acquisition module, and a signal switching unit. The data acquisition module includes multiple signal channels, each including a data acquisition signal channel and a test signal channel. The signal switching unit is used to perform switching operations between the data acquisition signal channel and the test signal channel under the control of the control module. The alarm device of this application performs a communication reliability test on the signal input line of the sensor every time interval t0, without affecting the detection of the low-voltage transformer status, and can promptly detect abnormal signal transmission and issue an alarm, especially for signal transmission abnormalities caused by communication abnormalities or analog signal processing abnormalities; it can ensure the real-time performance and reliability of low-voltage transformer status monitoring.

Description

Technical Field

[0001] This application relates to the technical field of low-voltage transformer testing equipment, and in particular to an intelligent detection and alarm device for the condition of a low-voltage transformer. Background Technology

[0002] The statements in this section are merely background information related to this application and do not necessarily constitute prior art.

[0003] Low-voltage transformers are electrical devices that convert high-voltage electrical energy into low-voltage electrical energy. They play a crucial role in many fields, including power systems, industrial production, and daily life. Because low-voltage transformers are directly used in field equipment, especially in manufacturing enterprises where the equipment is complex and prone to failure, their stability is increasingly important. Currently, there are various techniques for condition monitoring of low-voltage transformers, and both data acquisition and analysis of the acquired condition data are relatively sophisticated. However, low-voltage transformer condition data is often transmitted to a server backend via communication and then displayed on an industrial control computer or control panel. If problems occur during signal transmission, such as communication failures or issues during analog-to-digital conversion of field condition quantities, the transformer's condition data may not be displayed in a timely manner. If this occurs, transformer anomalies may be difficult to detect.

[0004] Therefore, it is necessary to provide an intelligent detection and alarm device for the condition of low-voltage transformers to solve the above-mentioned technical problems. Summary of the Invention

[0005] Based on this, and in response to the aforementioned technical problems, this application provides an intelligent detection and alarm device for the status of low-voltage transformers.

[0006] The technical solution adopted in this application to solve the problems existing in the prior art is: This application proposes an intelligent detection and alarm device for the condition of a low-voltage transformer, comprising: The signal input module includes a sensor unit and a test signal unit; The data acquisition module includes multiple signal channels. Each signal channel includes an acquisition signal channel and a test signal channel. The acquisition signal channel is electrically connected to the sensor unit, and the test signal channel is electrically connected to the test signal unit. The signal switching unit is located between the signal input module and the data acquisition module, and is used to perform the switching operation between the acquisition signal channel and the test signal channel under the action of the control module. The data processing module is used to process the signals acquired by the data acquisition module; The communication module is used to transmit data to the server backend; The test signal receiving module is connected to the server backend and is used to receive signals from the test signal unit and issue alarm information when the received signal is abnormal. The control module is electrically connected to the data acquisition module, signal switching unit, data processing module, communication module, and power supply module.

[0007] Preferably, The sensor unit includes multiple sensors for collecting different state quantities of the low-voltage transformer; The test signal unit is at t every day i The test signal unit emits a square wave signal with a duration of t starting at time t; where i is the number of times the test signal unit emits a square wave signal per day, i∈N+.

[0008] Preferably, t≥3T, where T is the period of the square wave signal.

[0009] Preferably, The abnormalities in the square wave signal include: The time tr when the test signal receiving module receives the square wave signal i The time t when the test signal unit emits the square wave signal i The difference between them exceeds the communication delay threshold M; The period TR of the square wave signal received by the test signal receiving module is unstable; The difference between the duration of the square wave signal received by the test signal receiving module and t exceeds the communication duration threshold Q; The difference between the period TR of the square wave signal received by the test signal receiving module and the period T of the square wave signal emitted by the test signal unit exceeds the communication stability threshold N.

[0010] Preferably, When the square wave signal becomes abnormal within a certain period of time t0, the signal switching unit does not perform the switching operation between the acquisition signal channel and the test signal channel; If the square wave signal does not show any abnormalities within a certain period of time t0, the signal switching unit performs the switching operation between the acquisition signal channel and the test signal channel under the control of the control module.

[0011] Preferably, The signal switching unit includes multiple signal switching components, each of which includes: The system includes a signal acquisition input port, a test signal input port, a first relay, and a second relay; among which: The signal input port is used to connect the sensor's signal input line; The test signal input port is used to connect the square wave signal input line of the test signal unit; The first relay has two sets of normally open contacts K01 K 02 and two sets of normally closed contacts K 03 K 04 The second relay has two sets of normally open contacts K 05 K 06 and two sets of normally closed contacts K 07 K 08 ; The sensor's signal input line passes through the two normally open contacts K of the first relay. 01 K 02 Connected to the test signal channel, via the two normally closed contacts K of the first relay. 03 K 04 Connect to the signal acquisition channel; The square wave signal output terminal of the test signal unit is connected to the two normally open contacts K of the second relay. 05 K 06 Connected to the signal acquisition channel, via the two sets of normally closed contacts K of the second relay. 07 K 08 Connect to the test signal channel.

[0012] Preferably, Under the control of the control module, the signal switching unit performs the switching operation between the acquisition signal channel and the test signal channel by controlling the first relay and the second relay to be energized or de-energized simultaneously.

[0013] Preferably, The time t0 ≥ 12h.

[0014] Preferably, The test signal unit is a square wave generator circuit.

[0015] Preferably, The control module, data acquisition module, signal switching unit, data processing module, communication module, and power supply module are all fixedly installed inside the control box; the power supply module is electrically connected to the photovoltaic panel, and the photovoltaic panel is fixedly installed above the control box. The sensor unit includes a current sensor, a vibration sensor, and a temperature sensor.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: 1. The signal input line of the sensor is tested for communication reliability every time interval t0 without affecting the monitoring of the low-voltage transformer status. This allows for timely detection and alarm of signal transmission anomalies, especially those caused by communication or analog signal processing errors. This ensures the real-time performance and reliability of low-voltage transformer status monitoring.

[0017] 2. The value of t0 can be set according to actual needs.

[0018] 3. Existing low-voltage transformer status anomaly alarms primarily target state quantities such as temperature, vibration, and current detected by sensors. An alarm is triggered when the detected state quantity exceeds a set threshold. However, it is difficult to detect when problems occur during state quantity transmission but the threshold is not exceeded. This application solves the problem of difficulty in issuing early warnings and alarms during the transmission of state quantities detected by sensors.

[0019] 4. The signal switching components are simple and reliable. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0021] Figure 1 This is an electrical schematic diagram of the signal switching component of the intelligent detection and alarm device for low-voltage transformer status in this application.

[0022] In the picture: 1. First relay, 2. Second relay, 3. Acquisition signal channel, 4. Test signal channel, 5. Acquisition signal input port, 6. Test signal input port. Detailed Implementation

[0023] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] In this disclosure, terms such as "upper," "lower," "left," "right," "front," "back," "vertical," "horizontal," "side," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely relational terms determined for the convenience of describing the structural relationship of the various components or elements in this disclosure, and do not specifically refer to any component or element in this disclosure, nor should they be construed as limiting this disclosure.

[0026] This application provides an intelligent detection and alarm device for the condition of a low-voltage transformer, comprising: The signal input module includes a sensor unit and a test signal unit; The data acquisition module includes multiple signal channels. Each signal channel includes an acquisition signal channel 3 and a test signal channel 4. The acquisition signal channel 3 is electrically connected to the sensor unit, and the test signal channel 4 is electrically connected to the test signal unit. The signal switching unit is located between the signal input module and the data acquisition module, and is used to perform the switching operation between the acquisition signal channel and the test signal channel under the action of the control module. The data processing module is used to process the signals acquired by the data acquisition module; The communication module is used to transmit data to the server backend; The test signal receiving module is connected to the server backend and is used to receive signals from the test signal unit and issue alarm information when the received signal is abnormal. The control module is electrically connected to the data acquisition module, signal switching unit, data processing module, communication module, and power supply module.

[0027] The control module, data acquisition module, signal switching unit, data processing module, communication module, and power supply module are all fixedly installed inside the control box. The power supply module is electrically connected to the photovoltaic panel, which is fixedly installed on top of the control box, or it can be installed separately from the control box. Depending on the actual situation, the control box and the photovoltaic panel can be placed on one side or near the low-voltage transformer, and the position of the photovoltaic panel can also be adjusted as needed to obtain the best lighting conditions.

[0028] The sensor unit includes multiple sensors for acquiring different state quantities of the low-voltage transformer. In some embodiments, the sensor unit includes a current sensor, a vibration sensor, and a temperature sensor, wherein the current transformer is used to acquire the current state of the low-voltage transformer, the vibration sensor is used to acquire the vibration state of the low-voltage transformer, and the temperature sensor is used to acquire the temperature state of the low-voltage transformer. The number of the three types of sensors is not limited, nor is it limited to only these three types. The number of sensors depends on the amount of state quantities that need to be acquired from the low-voltage transformer; this is a common technique used by those skilled in the art and will not be elaborated upon here.

[0029] The test signal unit is at t every day i A square wave signal with a duration of t is emitted starting at time t; where i is the number of times the test signal unit emits a square wave signal per day, i∈N+. t≥3T, where T is the period of the square wave signal. It should be noted that t here... i The time displayed is Beijing time. The test signal unit is connected to the wireless network to obtain Beijing time in real time.

[0030] Abnormalities in square wave signals include: The time tr when the test signal receiving module receives the square wave signal iThe time t when the test signal unit emits the square wave signal i If the difference between them exceeds the communication delay threshold M, there will definitely be a delay in sending the status data obtained on-site from the low-voltage transformer to the server backend, affecting the real-time performance of the low-voltage transformer status monitoring and early warning. The period TR of the square wave signal received by the test signal receiving module is unstable; under such circumstances, the status data obtained from the low-voltage transformer on site will inevitably result in signal instability when sent to the server backend. The difference between the duration of the square wave signal received by the test signal receiving module and t exceeds the communication duration threshold Q; in this case, the status variables acquired on-site by the low-voltage transformer will inevitably be lost or even not received at all when sent to the server backend. The difference between the period TR of the square wave signal received by the test signal receiving module and the period T of the square wave signal emitted by the test signal unit exceeds the communication stability threshold N. In this case, the status variables acquired at the low-voltage transformer site are sent to the server backend. Although the period of the signal may be stable, the change in period will inevitably lead to signal instability, which may manifest as a change in the duty cycle of the received signal.

[0031] Depending on the square wave signal, if the square wave signal exhibits an anomaly within a time period t0, the signal switching unit will not perform the switching operation between the acquisition signal channel and the test signal channel. Conversely, if the square wave signal remains normal within the time period t0, the signal switching unit, under the control of the control module, will perform the switching operation between the acquisition signal channel and the test signal channel. Specifically, if the square wave signal is normal within the duration t0, the signal switching unit will perform the switching operation between the acquisition signal channel and the test signal channel. If the square wave signal exhibits an anomaly within the time period t0, the signal switching unit will not perform the switching operation between the acquisition signal channel and the test signal channel, and in this case, the control module will control the alarm module to issue an alarm message to notify maintenance personnel. In some embodiments, the alarm module is electrically connected to the test signal receiving module.

[0032] In some embodiments, t0 ≥ 12h, meaning that every 12 hours, if the square wave signal is normal within the duration t0, the signal switching unit performs a switching operation between the acquisition signal channel and the test signal channel. In other words, if the test signal channel signal is stable for 12 hours and confirmed to be problem-free, the signal input line of the low-voltage transformer field sensor is connected, and then the square wave signal input line of the test signal unit is connected to the acquisition signal channel to test the signal transmission stability of the acquisition signal channel. In other embodiments, the value of t0 is set smaller. For example, in cases where communication anomalies occur frequently, t0 is set to less than 12 hours, and the communication reliability of the sensor's signal input line is tested every t0 time interval.

[0033] refer to Figure 1 The signal switching unit includes multiple signal switching components, and each signal switching component includes: The signal input port is 5, the test signal input port is 6, the first relay is 1, and the second relay is 2; where: The signal input port 5 is used to connect the signal input line of the sensor; Test signal input port 6 is used to connect the square wave signal input line of the test signal unit; The first relay 1 is equipped with two sets of normally open contacts K 01 K 02 and two sets of normally closed contacts K 03 K 04 The second relay 2 is equipped with two sets of normally open contacts K 05 K 06 and two sets of normally closed contacts K 07 K 08 ; The sensor's signal input line passes through the two normally open contacts K of the first relay 1. 01 K 02 Connected to test signal channel 4, via the two normally closed contacts K of the first relay 1 03 K 04 Connect to signal acquisition channel 3; The square wave signal output terminal of the test signal unit passes through the two normally open contacts K of the second relay 2. 05 K 06 Connected to signal acquisition channel 3, via two sets of normally closed contacts K of the second relay 2 07 K 08 Connect to test signal channel 4.

[0034] Under the control of the control module, the signal switching unit performs the switching operation between the acquisition signal channel and the test signal channel by controlling the first relay 1 and the second relay 2 to be powered on or off simultaneously.

[0035] In some embodiments, reference Figure 1 A power-on delay time relay is installed on each line between the first relay 1 and the data acquisition module, and between the second relay 2 and the data acquisition module. This delays the connection time from the signal input module to the data acquisition module when the first relay 1 and the second relay 2 are simultaneously powered on or simultaneously powered off, in order to prevent the difference in the action time of the auxiliary contacts of the first relay 1 and the second relay 2 from affecting the circuit.

[0036] In some embodiments, the test signal unit is a square wave generator circuit, which is electrically connected to the power supply module. Alternatively, it can be connected to a separate external power supply. This is a common technique used by those skilled in the art and will not be elaborated upon.

[0037] This application discloses an intelligent detection and alarm device for low-voltage transformer status. It performs a communication reliability check on the sensor's signal input line every time interval t0, without affecting the detection of low-voltage transformer status quantities. It can promptly detect signal transmission anomalies and issue alarms, especially for signal transmission anomalies caused by communication failures or analog signal processing errors. This ensures the real-time performance and reliability of low-voltage transformer status quantity monitoring. The value of t0 can be set according to actual needs. Existing technologies for low-voltage transformer status anomaly alarms primarily target status quantities such as temperature, vibration, and current detected by sensors. An alarm is triggered when the detected status quantity exceeds a set threshold; however, it is difficult to detect problems during status quantity transmission that do not exceed the set threshold. This application solves the problem of difficulty in issuing early warnings and alarms during the transmission of status quantities detected by sensors.

[0038] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0039] While the specific embodiments of this application have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of this application. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of this application are still within the scope of protection of this application.

Claims

1. A low-voltage transformer status intelligent detection and alarm device, characterized in that: include: The signal input module includes a sensor unit and a test signal unit; The data acquisition module includes multiple signal channels. Each signal channel includes an acquisition signal channel (3) and a test signal channel (4). The acquisition signal channel (3) is electrically connected to the sensor unit, and the test signal channel (4) is electrically connected to the test signal unit. The signal switching unit is located between the signal input module and the data acquisition module, and is used to perform the switching operation between the acquisition signal channel and the test signal channel under the action of the control module. The data processing module is used to process the signals acquired by the data acquisition module; The communication module is used to transmit data to the server backend; The test signal receiving module is connected to the server backend and is used to receive signals from the test signal unit and issue alarm information when the received signal is abnormal. The control module is electrically connected to the data acquisition module, signal switching unit, data processing module, communication module, and power supply module.

2. The intelligent detection and alarm device for low-voltage transformer status according to claim 1, characterized in that: The sensor unit includes multiple sensors for collecting different state quantities of the low-voltage transformer; The test signal unit is at t every day i The test signal unit emits a square wave signal with a duration of t starting at time t; where i is the number of times the test signal unit emits a square wave signal per day, i∈N+.

3. The intelligent detection and alarm device for low-voltage transformer status according to claim 2, characterized in that: t≥3T, where T is the period of the square wave signal.

4. The intelligent detection and alarm device for low-voltage transformer status according to claim 2 or 3, characterized in that: The abnormalities in the square wave signal include: The time tr when the test signal receiving module receives the square wave signal i The time t when the test signal unit emits the square wave signal i The difference between them exceeds the communication delay threshold M; The period TR of the square wave signal received by the test signal receiving module is unstable; The difference between the duration of the square wave signal received by the test signal receiving module and t exceeds the communication duration threshold Q; The difference between the period TR of the square wave signal received by the test signal receiving module and the period T of the square wave signal emitted by the test signal unit exceeds the communication stability threshold N.

5. The intelligent detection and alarm device for low-voltage transformer status according to claim 4, characterized in that: When the square wave signal becomes abnormal within a certain period of time t0, the signal switching unit does not perform the switching operation between the acquisition signal channel and the test signal channel; If the square wave signal does not show any abnormalities within a certain period of time t0, the signal switching unit performs the switching operation between the acquisition signal channel and the test signal channel under the control of the control module.

6. The intelligent detection and alarm device for low-voltage transformer status according to claim 5, characterized in that: The signal switching unit includes multiple signal switching components, each of which includes: The signal input port (5) is used for data acquisition, the signal input port (6) is used for testing, the first relay (1) is used, and the second relay (2) is used; among which: The signal input port (5) is used to connect the signal input line of the sensor; The test signal input port (6) is used to connect the square wave signal input line of the test signal unit; The first relay (1) has two sets of normally open contacts K 01 K 02 and two sets of normally closed contacts K 03 K 04 The second relay (2) is equipped with two sets of normally open contacts K 05 K 06 and two sets of normally closed contacts K 07 K 08 ; The sensor's signal input line passes through the two sets of normally open contacts K of the first relay (1). 01 K 02 Connected to the test signal channel (4), through the two sets of normally closed contacts K of the first relay (1) 03 K 04 Connect to the signal acquisition channel (3); The square wave signal output terminal of the test signal unit passes through the two normally open contacts K of the second relay (2). 05 K 06 Connected to the acquisition signal channel (3), via the two sets of normally closed contacts K of the second relay (2) 07 K 08 Connect to the test signal channel (4).

7. The intelligent detection and alarm device for low-voltage transformer status according to claim 6, characterized in that: Under the control of the control module, the signal switching unit performs the switching operation between the acquisition signal channel and the test signal channel by controlling the first relay (1) and the second relay (2) to be energized or de-energized at the same time.

8. The intelligent detection and alarm device for low-voltage transformer status according to claim 5, characterized in that: The time t0 ≥ 12h.

9. The intelligent detection and alarm device for low-voltage transformer status according to claim 1, characterized in that: The test signal unit is a square wave generator circuit.

10. The intelligent detection and alarm device for low-voltage transformer status according to claim 2, characterized in that: The control module, data acquisition module, signal switching unit, data processing module, communication module, and power supply module are all fixedly installed inside the control box; the power supply module is electrically connected to the photovoltaic panel, and the photovoltaic panel is fixedly installed above the control box. The sensor unit includes a current sensor, a vibration sensor, and a temperature sensor.

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