CN110867830A - Thermal relay with protection function - Google Patents

Abstract

The invention relates to a motor working protection device, in particular to a thermal relay with a protection function, comprising a controller, the controller is connected with a data acquisition module for collecting parameter data related to motor work, and the data acquisition module is connected to an output end of an analog-to-digital converter The analog-to-digital converter is connected with the current acquisition unit used to collect the current parameters related to the motor operation, and the voltage detection module used to collect the motor operating voltage parameters. The first temperature sensor and the second temperature sensor are connected to each other; the technical solution provided by the present invention can effectively overcome the defects of the prior art that the detection parameters are single, the intelligent protection cannot be performed according to the abnormal state of the motor, and the monitoring of the working temperature of the motor is lacking.

Description

A thermal relay with protection function

technical field

The invention relates to a motor working protection device, in particular to a thermal relay with a protection function.

Background technique

Motors are commonly used drive devices, and temperature has an important impact on the service life of the motor. During use, the normal temperature of the motor is maintained at about 90°C. However, during the working process of the motor, various conditions will cause the temperature of the motor to rise, such as high power supply voltage, large excitation current, three-phase voltage asymmetry that increases the current, damage or performance degradation of the motor cooling device, and lack of lubrication of the motor bearings. Oil, motor stator coil temperature rise, coil insulation failure leads to inter-turn short circuit, phase-to-phase short circuit or ground short circuit, etc. Excessive temperature will shorten the service life of the motor. If the temperature exceeds the limit of the motor, it will also cause the motor to be scrapped.

There is no monitoring of the operating temperature of the three-phase AC motor in the prior art, so that after the temperature of the motor rises, it cannot be detected in time and corresponding measures can be taken to avoid temperature runaway, and even damage to the motor. In addition, the detection parameters of the prior art are single, and the monitoring dynamic range is small, resulting in various product specifications, which is not conducive to the use and production management, and correspondingly increases the product cost.

SUMMARY OF THE INVENTION

(1) Technical problems solved

Aiming at the above shortcomings of the prior art, the present invention provides a thermal relay with a protection function, which can effectively overcome the single detection parameters in the prior art, the inability to perform intelligent protection according to the abnormal state of the motor, and the lack of monitoring the working temperature of the motor. Monitoring defects.

(2) Technical solutions

To achieve the above purpose, the present invention is achieved through the following technical solutions:

A thermal relay with a protection function includes a controller, the controller is connected with a data acquisition module for collecting parameter data related to motor operation, the data acquisition module is connected with an output end of an analog-to-digital converter, the analog-to-digital converter is connected The converter is connected with a current acquisition unit for acquiring current parameters related to motor operation and a voltage detection module for acquiring motor operating voltage parameters;

The controller is connected to the output end of the signal processing module, and the input end of the signal processing module is connected to the first temperature sensor and the second temperature sensor installed on the motor;

The controller is connected with a first memory for storing standard values of current parameters related to motor operation and standard values of motor operating voltage parameters, and the controller is connected with a second memory for storing data collected by the data acquisition module, so The controller is connected with the data comparison module for comparing the data in the second memory with the data in the first memory, the controller is connected with the execution module for performing corresponding actions on the motor, the The controller is connected to an alarm module for issuing an alarm, the controller is connected to a display module for displaying data in the second memory through a digital communication port, and the controller is connected to a wireless transmission of the data to the control center. The wireless communication module of the data in the second memory is connected.

Preferably, the current collection unit includes a current collection module for collecting motor operating current, a leakage current detection module for collecting leakage current generated by motor operation, and a zero-sequence current detection module for collecting zero-sequence current generated by motor operation module, and a short-circuit detection module used to collect whether a short-circuit occurs during the operation of the motor.

Preferably, the temperature detection ranges of the first temperature sensor and the second temperature sensor are two adjacent intervals.

Preferably, the temperature detection range of the first temperature sensor is 90°C-129°C, and the temperature detection range of the second temperature sensor is 130°C-150°C.

Preferably, when the controller receives the first temperature sensor signal processed by the signal processing module, the controller controls the alarm module to work; when the controller receives the signal processed by the signal processing module When the second temperature sensor signal is processed, the controller makes the motor stop working through the execution module.

Preferably, when the data comparison module compares the motor work-related current parameters in the second memory with the standard values of the motor work-related current parameters in the first memory, if the motor work-related current parameters are greater than the motor work-related current parameters The standard value of the relevant current parameter, the controller makes the motor stop working through the execution module.

Preferably, when the data comparison module compares the motor operating voltage parameter in the second memory with the motor operating voltage parameter standard value in the first memory, if the motor operating voltage parameter is greater than the motor operating voltage parameter standard value, the controller makes the motor stop working through the execution module.

Preferably, when the execution module includes a shunt release, a voltage loss release, an AC contactor and a three-phase motor starter.

Preferably, when the alarm module is a sound alarm device and/or a light alarm device.

(3) Beneficial effects

Compared with the prior art, a thermal relay with a protection function provided by the present invention has the following beneficial effects:

(1) The current acquisition module in the current acquisition unit collects the working current of the motor, the leakage current detection module collects the leakage current generated by the motor operation, the zero-sequence current detection module collects the zero-sequence current generated by the motor operation, and the short-circuit detection module collects the motor during operation. Whether there is a short circuit, the voltage detection module collects the motor working voltage parameters, and can display it on the display module through the digital communication port, and can also send it wirelessly to the control center through the wireless communication module. Facilitate external information exchange;

(2) The data comparison module compares the current parameters related to motor work with the standard values of current parameters related to motor work. If the current parameters related to motor work are greater than the standard values of current parameters related to motor work, the controller stops the motor by executing the module; The data comparison module compares the motor working voltage parameter with the standard value of the motor working voltage parameter. If the motor working voltage parameter is greater than the standard value of the motor working voltage parameter, the controller stops the motor by executing the module, so that it can perform intelligent operation according to the abnormal state of the motor. Protect;

(3) When the controller receives the first temperature sensor signal processed by the signal processing module, the controller controls the alarm module to work; when the controller receives the second temperature sensor signal processed by the signal processing module, the controller The motor is stopped by the execution module, and the corresponding protection measures are taken while the working temperature of the motor is effectively monitored.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

Fig. 1 is the system schematic diagram of the present invention;

FIG. 2 is a schematic diagram of the current detection unit in FIG. 1 of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

A thermal relay with protection function, as shown in Figure 1 and Figure 2, includes a controller, the controller is connected with a data acquisition module for collecting motor working-related parameter data, and the data acquisition module is connected with the output end of the analog-to-digital converter , the analog-to-digital converter is connected with the current acquisition unit for collecting the current parameters related to the motor operation and the voltage detection module for collecting the motor operating voltage parameters;

The controller is connected with the output end of the signal processing module, and the input end of the signal processing module is connected with the first temperature sensor and the second temperature sensor installed on the motor;

The controller is connected with the first memory for storing the standard value of the current parameter related to the working of the motor and the standard value of the working voltage parameter of the motor, the controller is connected with the second memory for storing the data collected by the data acquisition module, and the controller is used for storing the first memory. The data in the second memory is connected with the data comparison module for comparing the data in the first memory, the controller is connected with the execution module for performing corresponding actions on the motor, the controller is connected with the alarm module for issuing an alarm, the controller The digital communication port is connected with the display module for displaying the data in the second memory, and the controller is connected with the wireless communication module for wirelessly sending the data in the second memory to the control center.

The current acquisition unit includes a current acquisition module for acquiring motor operating current, a leakage current detection module for acquiring leakage current generated by motor operation, a zero-sequence current detection module for acquiring zero-sequence current generated by motor operation, and a zero-sequence current detection module for acquiring zero-sequence current generated by motor operation. A short-circuit detection module that collects whether a short-circuit occurs during motor operation.

The temperature detection ranges of the first temperature sensor and the second temperature sensor are two adjacent intervals.

The temperature detection range of the first temperature sensor is 90°C-129°C, and the temperature detection range of the second temperature sensor is 130°C-150°C.

When the controller receives the first temperature sensor signal processed by the signal processing module, the controller controls the alarm module to work; when the controller receives the second temperature sensor signal processed by the signal processing module, the controller passes the execution module make the motor stop working.

When the data comparison module compares the current parameters related to motor work in the second memory with the standard values of current parameters related to motor work in the first memory, if the current parameters related to motor work are greater than the standard values of current parameters related to motor work, the controller passes The execution module makes the motor stop working.

When the data comparison module compares the motor working voltage parameter in the second memory with the standard value of the motor working voltage parameter in the first memory, if the motor working voltage parameter is greater than the standard value of the motor working voltage parameter, the controller makes the motor work through the execution module. stop working.

When the execution module includes shunt release, voltage loss release, AC contactor and three-phase motor starter.

When the alarm module is a sound alarm device and/or a light alarm device.

The current acquisition module in the current acquisition unit collects the working current of the motor, the leakage current detection module collects the leakage current generated by the motor operation, the zero-sequence current detection module collects the zero-sequence current generated by the motor operation, and the short-circuit detection module collects whether a short circuit occurs during the motor operation. The voltage detection module collects the motor working voltage parameters, and can display it on the display module through the digital communication port, and can also send it wirelessly to the control center through the wireless communication module, so as to realize the collection of all parameters of the motor working current and voltage, and it is also convenient for external information. interact.

The data comparison module compares the motor work-related current parameters with the standard values of the motor work-related current parameters. If the motor work-related current parameters are greater than the motor work-related current parameter standard values, the controller stops the motor through the execution module; the data comparison module Compare the motor working voltage parameter with the standard value of the motor working voltage parameter. If the motor working voltage parameter is greater than the standard value of the motor working voltage parameter, the controller stops the motor through the execution module, so that intelligent protection can be performed according to the abnormal state of the motor.

The execution module includes shunt release, voltage loss release, AC contactor and three-phase motor starter.

When the controller receives the first temperature sensor signal processed by the signal processing module, the controller controls the alarm module to work; when the controller receives the second temperature sensor signal processed by the signal processing module, the controller makes the execution module make When the motor stops working, the working temperature of the motor is effectively monitored and corresponding protection measures are taken.

The temperature detection ranges of the first temperature sensor and the second temperature sensor are two adjacent intervals. The temperature detection range of the first temperature sensor is 90°C-129°C, and the temperature detection range of the second temperature sensor is 130°C-150°C. The alarm module is an audible alarm device and/or a light alarm device.

The first temperature sensor and the second temperature sensor used in the technical solution of the present application can adopt a temperature sensor processing circuit with an adjustable range disclosed in the invention with application number CN201620767431.5, and the analog-to-digital converter can adopt AD7478. The internal structure and pin function of the electrical components involved in the technical solution of the present application can be viewed in the factory manual. The circuit connection relationship of the electrical components involved in the technical solution of the present application can be obtained according to the factory manual, which is well known to those skilled in the art common sense.

It is worth noting that the purpose of the present invention is only to provide a hardware configuration that is different from the prior art, so that the skilled person can realize further development under such a hardware configuration. According to the actual effect needs to be programmed.

A thermal relay with a protection function provided by the present invention has the following beneficial effects:

(1) The current acquisition module in the current acquisition unit collects the working current of the motor, the leakage current detection module collects the leakage current generated by the motor operation, the zero-sequence current detection module collects the zero-sequence current generated by the motor operation, and the short-circuit detection module collects the motor during operation. Whether there is a short circuit, the voltage detection module collects the motor working voltage parameters, and can display it on the display module through the digital communication port, and can also send it wirelessly to the control center through the wireless communication module. Facilitate external information exchange;

(2) The data comparison module compares the current parameters related to motor work with the standard values of current parameters related to motor work. If the current parameters related to motor work are greater than the standard values of current parameters related to motor work, the controller stops the motor by executing the module; The data comparison module compares the motor working voltage parameter with the standard value of the motor working voltage parameter. If the motor working voltage parameter is greater than the standard value of the motor working voltage parameter, the controller stops the motor by executing the module, so that it can perform intelligent operation according to the abnormal state of the motor. Protect;

(3) When the controller receives the first temperature sensor signal processed by the signal processing module, the controller controls the alarm module to work; when the controller receives the second temperature sensor signal processed by the signal processing module, the controller The motor is stopped by the execution module, and the corresponding protection measures are taken while the working temperature of the motor is effectively monitored.

The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The recorded technical solutions are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. A thermal relay with a protection function, comprising a controller, characterized in that: the controller is connected with a data acquisition module for acquiring motor work related parameter data, the data acquisition module is connected with the output end of an analog-to-digital converter, and the analog-to-digital converter is connected with a current acquisition unit for acquiring motor work related current parameters and a voltage detection module for acquiring motor work voltage parameters;

the controller is connected with the output end of the signal processing module, and the input end of the signal processing module is connected with a first temperature sensor and a second temperature sensor which are arranged on the motor;

the controller is connected with a first memory used for storing a motor working-related current parameter standard value and a motor working voltage parameter standard value, the controller is connected with a second memory used for storing data collected by the data collection module, the controller is connected with a data comparison module used for comparing data in the second memory with data in the first memory, the controller is connected with an execution module used for executing corresponding actions on the motor, the controller is connected with an alarm module used for giving an alarm, the controller is connected with a display module used for displaying data in the second memory through a digital communication port, and the controller is connected with a wireless communication module used for wirelessly sending the data in the second memory to a control center.

2. The thermal relay with protection function according to claim 1, characterized in that: the current acquisition unit comprises a current acquisition module for acquiring the working current of the motor, a leakage current detection module for acquiring leakage current generated by the working of the motor, a zero sequence current detection module for acquiring zero sequence current generated by the working of the motor, and a short circuit detection module for acquiring whether short circuit occurs in the working of the motor.

3. The thermal relay with protection function according to claim 1, characterized in that: the temperature detection ranges of the first temperature sensor and the second temperature sensor are two adjacent intervals.

4. The thermal relay with protection function according to claim 3, characterized in that: the temperature detection range of the first temperature sensor is 90-129 ℃, and the temperature detection range of the second temperature sensor is 130-150 ℃.

5. The thermal relay with protection function according to claim 1, characterized in that: when the controller receives the first temperature sensor signal processed by the signal processing module, the controller controls an alarm module to work; and when the controller receives the second temperature sensor signal processed by the signal processing module, the controller stops the motor through the execution module.

6. The thermal relay with protection function according to claim 1, characterized in that: when the data comparison module compares the motor working-related current parameter in the second memory with the motor working-related current parameter standard value in the first memory, if the motor working-related current parameter is greater than the motor working-related current parameter standard value, the controller enables the motor to stop working through the execution module.

7. The thermal relay with protection function according to claim 1, characterized in that: when the data comparison module compares the motor working voltage parameter in the second memory with the motor working voltage parameter standard value in the first memory, if the motor working voltage parameter is larger than the motor working voltage parameter standard value, the controller enables the motor to stop working through the execution module.

8. The thermal relay with protection function according to claim 1, characterized in that: when the execution module comprises a shunt release, a voltage loss release, an alternating current contactor and a three-phase motor starter.

9. The thermal relay with protection function according to claim 1, characterized in that: when the alarm module is a sound alarm device and/or a light alarm device.

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