CN211046462U - Non-electric quantity protection device for high-voltage motor - Google Patents

Abstract

The utility model discloses a non-electrical protection device for a high-voltage motor, comprising a main control module, a monitoring module, a switch circuit and a display module; the monitoring module comprises a temperature monitoring unit, a tension deformation monitoring unit and a noise monitoring unit; the monitoring module Send the measured non-electricity signal to the main control module, the main control module cuts off the high-voltage motor in time through the switch circuit alarm, and displays the fault type through the display module. Real-time monitoring of non-electricity changes of high-voltage motors, which can detect and solve motor faults and potential faults in a timely manner through variables, and issue corresponding alarm signals while judging the type of faults, and cut off high-voltage motors in serious faults, reducing losses and expansion of hazards; it can be realized All-round, accurate and rapid protection of high-voltage motors, improve the service life of high-voltage motors, improve the sensitivity and accuracy of monitoring, reduce the incidence of accidents, and effectively ensure production.

Description

A high-voltage motor non-electrical protection device

technical field

The utility model relates to a safety protection device for a motor, in particular to a non-electrical protection device for a high-voltage motor.

Background technique

High-voltage motors occupy an important position in the production of industrial enterprises, and their safe operation plays a decisive role in ensuring the normal operation of the system and power quality. At the same time, the motor itself is a very valuable electronic device. If it fails, it will cause huge losses to the economic benefits of the enterprise and affect the normal production of the device. Therefore, it is necessary to design a safe, reliable and good performance protection device for high-voltage motors.

The failure of the high-voltage motor will have a serious impact on the production and life of the enterprise. Once a problem occurs, it will affect the safe and stable operation of the system. Many high-voltage motor failures occurred in recent years, mostly because of insufficient protection.

The power protection of high-voltage motors, such as differential protection, low-voltage protection, over-current protection, etc., has poor anti-interference ability and low sensitivity. It is difficult to monitor multiple signals at the same time, and there are hidden dangers. For a long time, the non-electrical protection of high-voltage motors has not attracted the attention of the industry and is at the primary level.

Utility model content

Purpose of the utility model: In order to solve the problems existing in the prior art, the utility model provides a non-electrical protection device for a high-voltage motor with strong anti-interference ability and high sensitivity.

Technical solution: a non-electrical protection device for a high-voltage motor, comprising a main control module, a monitoring module, a switch circuit and a display module; the monitoring module includes a temperature monitoring unit, a tension deformation monitoring unit, a noise monitoring unit and a gas monitor, the monitoring module Send the measured non-electricity signal to the main control module, the main control module alarms and cuts off the high-voltage motor through the switch circuit, and displays the fault type through the display module.

The main control module is connected to an alarm circuit; the alarm circuit includes a light-emitting diode, a triode and a buzzer; the triode is controlled by the main control module to perform switching state conversion; the P1.6 and P1.7 pins of the main control module Control the working status of buzzer and diode respectively.

The monitoring module includes a temperature monitoring unit, a tension deformation monitoring unit, a noise monitoring unit and a gas monitor for monitoring non-electrical parameters of the high-voltage motor; the monitoring module sends the measured non-electrical signal to the main control module, The main control module cuts off the high-voltage motor in time through the switch circuit alarm, and displays the fault type through the display module.

The temperature monitoring unit includes three-phase temperature sensors respectively installed on the three-phase windings of the high-voltage motors A, B, and C, and an ambient temperature sensor for monitoring the ambient temperature. When a fault occurs inside the high-voltage motor, the temperature rises, and the temperature sensor can monitor the temperature change in real time and predict the temperature change trend, and the main control module can judge the type of the fault and alarm and cut off the high-voltage motor in time.

The tension deformation monitoring unit includes a tension deformation sensor installed on the winding iron core of the high-voltage motor. When a fault occurs inside the high-voltage motor, the temperature rises and the expansion tension of the iron core increases. The deformation sensor can monitor the tension change in real time and predict the change trend, and calculate the tension change rate through the main control module, and determine the fault type.

The monitoring module further includes a noise monitoring unit installed on the wall of the high-voltage motor box, the noise monitoring unit monitors the noise emitted by the high-voltage motor body in real time, and the noise monitoring unit is controlled by the main control module. The frequency of the noise emitted by the motor in the starting state, normal operation and failure is different. When the noise change exceeds the conventional standard, the corresponding alarm circuit can be triggered to remind the staff.

The monitoring module further includes a gas monitor mounted on the wall of the high-voltage motor box, and the gas monitor is controlled by the main control module. When the high-voltage motor fails, gases such as CH ₄ , CO, and SO ₂ will be emitted; the gas monitor determines whether the high-voltage motor fails by monitoring the gas concentration.

Further, the high-voltage motor non-electrical protection device further includes a touch screen, the touch screen is connected to the main control module; the main control module is connected to a computer, and the touch screen is connected to the computer.

Further, the high-voltage motor non-electrical protection device further includes a communication module and a mobile monitoring device; the main control module sends a monitoring signal to the mobile monitoring device through the communication module.

Beneficial effect: Compared with the prior art, the utility model can monitor the non-electricity change of the high-voltage motor in real time, find and solve the motor fault or potential fault in time through the variable, and send out the corresponding alarm signal while judging the fault type, and cut off the high-voltage when serious. Motors, reducing losses and hazards. It can also monitor the non-electrical signals of multiple high-voltage motors at the same time. Combined with touch screen, computer, GPRS communication, mobile phone display and alarm module, etc., it can protect high-voltage motors more accurately and quickly in all directions, and improve the service life of high-voltage motors. The sensitivity and accuracy of monitoring are improved, the accident rate is greatly reduced, and production is effectively guaranteed.

Description of drawings

Fig. 1 is the working principle structure block diagram of the present utility model;

Fig. 2 is the main control module circuit schematic diagram of the utility model;

Fig. 3 is the alarm circuit diagram of the utility model;

FIG. 4 is a temperature sensor conversion circuit of the present invention.

Detailed ways

The technical solution of the present utility model will be further described below with reference to the accompanying drawings and specific embodiments of the description.

As shown in Figure 1, the high-voltage motor non-electrical protection device of the present utility model is composed of a main control module, various monitoring modules, switching circuits and auxiliary display equipment; wherein, the monitoring module is used to monitor the temperature, tension deformation, noise and Non-electricity such as gas concentration, including temperature monitoring unit, tension deformation monitoring unit, noise monitoring unit and gas concentration monitoring unit; auxiliary display devices include touch screen, computer, GPRS communication, mobile phone display terminal and remote secondary instrument, etc.

As shown in Figure 2, the main control module is the STC51 single-chip microcomputer; the analog-to-digital conversion module utilizes the internal A/D conversion function of the STC51 single-chip microcomputer.

As shown in Figure 3, the alarm circuit is composed of light-emitting diodes and triodes connected to the buzzer. The switching of the working states of the triodes in the alarm circuit is controlled by the STC51 single-chip microcomputer, and is controlled by the main control module to realize the switch state conversion; P1.6 of the main control module and P1.7 pins are used to control the working state of the buzzer and diode respectively. When the monitored temperature, tension, noise, gas concentration, etc. have one or more variables that exceed the normal working range, the corresponding LEDs for temperature, pressure, noise, gas concentration, etc. will be lit up. The diode can judge the fault point, and the main control module will drive the buzzer that they use together to realize the function of alarm.

As shown in Figure 4, the temperature sensor resistance voltage conversion circuit uses the temperature of the temperature resistance Pt100 and its resistance to change approximately linearly, and uses a three-wire connection method to eliminate the influence of contact resistance and lead resistance. Among them, R3, R4, and R5 are the equivalent resistances of the three leads. After the amplifier circuit and filter signal, it can convert the resistance signal into a voltage signal and transmit it to the main control chip.

The temperature monitoring unit is a temperature sensor installed on the three-phase windings of the high-voltage motor A, B, and C, and a temperature sensor specially used to monitor the ambient temperature. There are four temperature sensors in total, and the necessary signal amplification is performed respectively. A/D conversion and memory are carried out within the The temperature sensor measures the signal. If the power signal is small, the signal is amplified by the amplifier circuit, and then the signal is transmitted to the A/D conversion I/O port of the single-chip microcomputer, and the binary data information is obtained by using the analog-to-digital conversion function of the single-chip microcomputer. Then carry out data processing to realize real-time monitoring of temperature. When the temperature is obtained, it needs to be compared with the temperature in the normal range. When the temperature of the high-voltage motor rises, the corresponding light-emitting diode is turned on, and the buzzer is turned on to give an alarm; at the same time, if the temperature difference exceeds If the temperature is too large, the temperature switch, that is, the relay, will act to realize over-temperature protection and cut off the high-voltage motor.

At the same time, the single-chip microcomputer obtains the temperature rise rate dT/dt through timing calculation, and can judge whether the temperature rise is normal according to the three-phase winding and the temperature rise rate of the environment. High-voltage motor single-phase short-circuit fault, two-phase short-circuit fault, three-phase short-circuit fault, etc., realize the real-time monitoring of temperature change rate and specific fault types.

The tension protection is monitored by the tension deformation sensor, and the necessary amplifying circuit is also carried out to amplify the signal, and then converted and stored in the main control module. The acquisition of tension deformation is synchronized with the temperature. The tension deformation sensor is used to monitor the change of winding tension and predict the change trend. The signal monitoring and real-time monitoring of tension change are the same as the temperature strategy. The same buzzer is used for alarm and over-temperature alarm. , but a different lamp is lit. At the same time of alarm, the high-voltage motor is cut off to protect the motor. At the same time, it can also calculate the rate of change of tension, and determine the type of failure of the high-voltage motor.

The high-voltage motor non-electrical protection device of the utility model further comprises a noise measuring unit. The noise monitoring unit utilizes a sound sensor to monitor the sound frequency and directly transmit it to the main control chip for A/D conversion and storage. The noise sensor is used to monitor the noise signal, and after filtering and amplification, it is converted into an electrical signal and transmitted to the A/D conversion I/O port of the single-chip microcomputer.

The high-voltage motor non-electrical protection device of the utility model further comprises a gas monitor installed on the wall of the high-voltage motor box of the device, which is controlled by the main control module. When the high-voltage motor fails, gases such as CH ₄ , CO and SO ₂ will be emitted; the gas monitor determines whether the motor fails by monitoring the gas concentration.

The main control module will access the data, process and calculate the rate of change, and cooperate with the corresponding external modules such as GPRS mobile phone display, touch screen and computer, so as to accurately judge the fault and non-fault of the high-voltage motor. The circuit is cut off in time, so as to achieve the function of protecting the motor through non-electricity. In addition, the data corresponding to each protection module can be connected to the mobile phone through the wireless communication module for data transmission and real-time monitoring.

Claims (9)

1. A high-voltage motor non-electric quantity protection device comprises a main control module, a monitoring module, a switch circuit and a display module; the method is characterized in that: the monitoring module comprises a temperature monitoring unit, a tension deformation monitoring unit, a noise monitoring unit and a gas monitor, the monitoring module sends a measured non-electric quantity signal to the main control module, and the main control module gives an alarm to cut off the high-voltage motor through the switch circuit and displays a fault type through the display module.

2. The non-electric quantity protection device of the high-voltage motor according to claim 1, characterized in that: the temperature monitoring unit comprises a three-phase temperature sensor and an environment temperature sensor, and the main control module judges the fault type and timely alarms and cuts off the high-voltage motor.

3. The non-electric quantity protection device of the high-voltage motor according to claim 1, characterized in that: and a tension deformation sensor is arranged in the tension deformation monitoring unit.

4. The non-electric quantity protection device of the high-voltage motor according to claim 1, characterized in that: the noise monitoring unit is controlled by the main control module and monitors the noise emitted by the high-voltage motor body in real time; when the noise changes over the conventional standard, the staff is reminded by triggering the corresponding alarm circuit.

5. The non-electric quantity protection device of the high-voltage motor according to claim 1, characterized in that: the gas monitor is controlled by a main control module; the fault state of the high-voltage motor can give out CH₄、CO、SO₂And the gas monitor judges whether the high-voltage motor fails or not by monitoring the gas concentration.

6. The non-electric quantity protection device of the high-voltage motor according to claim 1, characterized in that: the main control module is connected with an alarm circuit.

7. The non-electric quantity protection device of the high-voltage motor according to claim 6, characterized in that: the alarm circuit comprises a light emitting diode, a triode and a buzzer; the triode is controlled by the main control module to switch states, and pins P1.6 and P1.7 of the main control module are respectively used for controlling the working states of the buzzer and the diode.

8. The non-electric quantity protection device of the high-voltage motor according to claim 1, characterized in that: the touch screen is connected with the main control module; the main control module is connected with a computer, and the touch screen is connected with the computer.

9. The non-electric quantity protection device of the high-voltage motor according to claim 1, characterized in that: the main control module sends the monitoring signals to the mobile monitoring equipment through the communication module.

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