CN105424161A - Collection system, judgment system, collection method and judgment method for vibration state of breaker housing - Google Patents

Abstract

The invention discloses an acquisition system, a judging system, an acquisition method and a judging method for the vibration state of a circuit breaker casing, which mainly include an acceleration sensor, a signal conditioning device, a trigger circuit, an SPI, a DSP system and an ARM system. Module connection, the output terminal of the signal conditioning module is connected to the DSP system, the DSP system is connected to the ARM system through SPI, the output contact of the trigger circuit is connected to the DSP system, and a touch display screen is also included, and the touch display screen is connected to the ARM system , this system diagnoses the state of the circuit breaker by monitoring the vibration of the circuit breaker casing and this system is based on an embedded system, which requires a small space and is friendly to human-computer interaction, which is convenient for maintenance personnel to judge the working status of the circuit breaker and prolong the service life of the circuit breaker .

Description

Acquisition system, judging system, acquisition method and judging method of circuit breaker casing vibration state

technical field

The invention relates to the field of vibration monitoring of a circuit breaker casing, in particular to a vibration state collection system, a judgment system, a collection method and a judgment method of a circuit breaker casing.

Background technique

In the power system, according to the operation and scheduling requirements of the power grid, circuit breakers are used to reliably switch on or off lines and electrical equipment. The circuit breaker opens and closes the circuit by opening and closing the contacts. Since the closing action of the circuit breaker is linked by various internal mechanisms, strong vibration and impact are generated at the same time. If the internal structure of the circuit breaker changes or some mechanism fails, the vibration of the casing will change. Chassis vibration can be used to diagnose the condition of the circuit breaker. Moreover, the existing vibration signal circuit breaker diagnosis system has problems such as complicated installation, large system volume, inflexible use, and unfriendly human-computer interaction.

Contents of the invention

The technical problem solved by the present invention is to provide a circuit breaker casing vibration state acquisition system which can judge the state of the circuit breaker by monitoring the vibration of the circuit breaker casing.

The technical solution adopted by the present invention to solve the technical problem is: the vibration state acquisition system of the circuit breaker casing, including a speed sensor, a signal conditioning device, a trigger circuit, an SPI, a DSP system and an ARM system, and the acceleration sensor is connected to a signal conditioning module , the output terminal of the signal conditioning module is connected with the DSP system, the DSP system is connected with the ARM system through SPI, the two ends of the output contact of the trigger circuit are respectively connected with the power supply of the DSP system and the external interrupt pin, and also includes a touch display screen, so The touch display screen is connected with the ARM system;

The acceleration sensor is used to measure the vibration signal of the circuit breaker casing, the trigger circuit is used to trigger the DSP external interrupt for sampling, and the DSP system is used for AD sampling, data processing and sending data to the ARM system through SPI, so The above-mentioned ARM system is used to receive the data sent by the DSP, save it and display it on the touch screen.

Further: it also includes an AD sampling chip connected between the signal conditioning module and the DSP system, the model of the AD sampling chip is AD7606, the model of the DSP chip in the DSP system is TMS320F28335, and the ARM in the ARM system The model of the chip is S3C6410.

Further, the trigger circuit includes two sets of resistors and an optocoupler relay, and the two sets of resistors are respectively connected in series with two input terminals of the optocoupler relay.

The present invention also introduces a system for judging the vibration state of a circuit breaker casing, including an acceleration sensor, a signal conditioning device, a trigger circuit, an SPI, a DSP system, and an ARM system. The acceleration sensor is connected to a signal conditioning module, and the output terminal of the signal conditioning module It is connected with the DSP system, the DSP system is connected with the ARM system through SPI, the two ends of the output contact of the trigger circuit are respectively connected with the power supply of the DSP system and the external interrupt pin, and a touch display screen is also included, and the touch display screen is connected with the ARM system connect;

The acceleration sensor is used to measure the vibration signal of the circuit breaker casing, the trigger circuit is used to trigger the DSP external interrupt for sampling, and the DSP system is used for AD sampling, data processing and sending data to the ARM system through SPI, so The ARM system is used to receive the data sent by the DSP and process the data, save it and display it on the touch screen. The ARM system also includes a judgment module to judge whether the state of the circuit breaker is normal and display the result on the touch screen show.

Further: it also includes an AD sampling chip connected between the signal conditioning module and the DSP system, the model of the AD sampling chip is AD7606, the model of the DSP chip in the DSP system is TMS320F28335, and the ARM in the ARM system The model of the chip is S3C6410.

Further, the trigger circuit includes two sets of resistors and an optocoupler relay, and the two sets of resistors are respectively connected in series with two input terminals of the optocoupler relay.

The invention also provides a method for collecting the vibration state of the circuit breaker casing. When the circuit breaker receives an opening or closing command, the voltage is obtained at both ends of the resistive optocoupler relay branch connected in parallel with the opening and closing coil, and the optocoupler The relay output contact is closed so that the DSP gets the signal, and the DSP external interrupt generates a falling edge and becomes low level. The DSP system provides the sampling clock for the external AD chip and reads the vibration signal after the analog-digital conversion. After the sampling is completed, if the circuit breaker is closed gate, the DSP decomposes the vibration signal with a 3-layer wavelet packet based on the DB4 wavelet to obtain 8 sequences, and calculates the energy entropy of these 8 sequences respectively, and the obtained 8 entropy values are used as feature quantities, and then the DSP converts the The data is sent to the ARM system, and the SPI driver module in the ARM system will enter an interrupt in the background after the SPI receives the data, automatically save its characteristic value, and display the characteristic value on the touch screen.

The invention also provides a method for judging the vibration state of the circuit breaker casing. When the circuit breaker receives an opening or closing command, the two ends of the branch circuit of the resistor optocoupler relay connected in parallel with the opening and closing coil obtain voltage at the same time, and the optocoupler The relay output contact is closed so that the DSP gets the signal, and the DSP external interrupt generates a falling edge and becomes low level. The DSP system provides the sampling clock for the external AD chip and reads the vibration signal after the analog-digital conversion. After the sampling is completed, if the circuit breaker is closed gate, the DSP decomposes the vibration signal with a 3-layer wavelet packet based on the DB4 wavelet to obtain 8 sequences, and calculates the energy entropy of these 8 sequences respectively, and the obtained 8 entropy values are used as feature quantities, and then the DSP converts the The data is sent to the ARM system, and the SPI driver module in the ARM system will enter the background interrupt after the SPI receives the data, and automatically save its feature quantity. Before judging its feature quantity, the SVM support vector machine algorithm must be trained once. First, according to the above method, collect no less than 30 groups of samples of closing vibration signal characteristics of the same type of circuit breaker under normal conditions, and mark them as normal samples; set the type of SVM to one-class-svm, and use this group of samples Carry out training, after the training is completed, send the newly measured feature quantity into the SVM support vector machine for judgment, and display the result on the touch screen.

The beneficial effects of the present invention are: the present invention can sample the vibration of the casing every time the circuit breaker is closed, and extract its characteristic quantity, and can accurately judge the state of the circuit breaker; this system is based on an embedded system, and the required space is small, Friendly human-computer interaction, which is convenient for maintenance personnel to judge the working status of the circuit breaker and prolong the service life of the circuit breaker.

Description of drawings

Figure 1 is the overall structure diagram of the vibration state acquisition system of the circuit breaker casing.

Fig. 2 is a flow chart of the system method for acquiring the vibration state of the circuit breaker casing.

Figure 3 is a schematic diagram of the trigger circuit.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

A circuit breaker (English name: circuit-breaker, circuitbreaker) refers to a switch that can close, carry and break current under normal circuit conditions and can close, carry and break current under abnormal circuit conditions within a specified time device. The circuit breaker is mainly composed of three basic parts, namely contacts, arc extinguishing system and various releases, including overcurrent release, loss of voltage (undervoltage) release, thermal release, shunt release device and free release. The circuit breaker switch is closed manually or electrically by the operating mechanism. After the contacts are closed, the free tripping mechanism locks the contacts in the closed position. When the above-mentioned fault occurs in the circuit, the free tripping mechanism will be activated through the respective release, and the trip will be automatic to realize the protection function. The shunt release is used as a remote control breaking circuit. The over-current release is used for short-circuit and over-current protection of the line. When the current of the line is greater than the set current value, the electromagnetic force generated by the over-current release makes the hook trip, and the movable contact breaks quickly under the tension of the spring. Open to realize the tripping function of the short circuit. Since the closing action of the circuit breaker is linked by various internal mechanisms, strong vibration and impact are generated at the same time. If the internal structure of the circuit breaker changes or some mechanism fails, the vibration of the casing will change. Chassis vibration can be used to diagnose the condition of the circuit breaker.

As shown in Figures 1 to 2, the vibration state acquisition system of the circuit breaker casing is characterized in that it includes an acceleration sensor, a signal conditioning device, a trigger circuit, an SPI, a DSP system and an ARM system, and the SPI is a serial peripheral interface (SerialPeripheralInterface) abbreviation, SPI, is a high-speed, full-duplex, synchronous communication bus. The DSP is the abbreviation of digital signal processing (digital signal processing), which is the theory and technology of processing signals in the form of numerical calculation. The ARM system is the first RISC microprocessor designed by Acorn Co., Ltd. for the low-budget market . It was earlier called AcornRISCMachine. The acceleration sensor is connected with the signal conditioning module, the output terminal of the signal conditioning module is connected with the DSP system, and the DSP system is connected with the ARM system through SPI, and the two ends of the output contact of the trigger circuit are respectively connected with the power supply and the external interrupt pin of the DSP system It also includes a touch display screen, which is connected to the ARM system; when the circuit breaker is to be detected, the acceleration sensor is first installed on the top of the circuit breaker casing, and the two input terminals of the trigger circuit are respectively connected to the circuit breaker. At this time, when the circuit breaker is working, the casing will vibrate, and the acceleration sensor and the trigger circuit will get signals at the same time to start working. Since the acceleration sensor is connected to the signal processing module, the signal processing module of this system The chip model used is CM3502, and the chip model of the acceleration sensor is CA-YD-180. The signal processing module provides a constant current power supply for the acceleration sensor and at the same time passes the AC measured acceleration signal output by the acceleration sensor superimposed on the DC bias. CR high-pass DC blocking output, blocking the DC bias voltage, and transmitting the AC acceleration signal to the DSP system. At the same time, due to the triggering of the trigger circuit, the external interrupt of the DSP system generates a falling edge and becomes low level, and the DSP enters the sampling interrupt for data sampling. , the collected analog signal is converted into a digital signal using the on-chip AD of the DSP, and then the DSP decomposes the digital signal with a 3-layer wavelet packet based on the DB4 wavelet to obtain the energy entropy of 8 sequences, and obtain 8 An entropy value is used as a characteristic quantity, and the DSP sends the obtained characteristic quantity to the ARM system through the SPI. The SPI driver module in the ARM system will enter the background interrupt after the SPI receives the data, automatically save the characteristic quantity of the vibration signal, and The characteristic quantity is displayed on the touch screen, and the maintenance personnel compare the characteristic quantity displayed on the touch screen with the characteristic quantity of the circuit breaker measured by the circuit breaker in the normal state detected in the past, and obtain the state of the circuit breaker . This system is based on an embedded system and requires a small space, which is convenient for the maintenance personnel to judge the working status of the circuit breaker and prolong the service life of the circuit breaker. The maintenance personnel can check the previous data through the touch screen, and the human-computer interaction is friendly.

The present invention also provides a system for judging the vibration state of a circuit breaker casing, including an acceleration sensor, a signal conditioning device, a trigger circuit, an SPI, a DSP system, and an ARM system. The acceleration sensor is connected to a signal conditioning module, and the signal conditioning module The output end is connected with the DSP system, and the DSP system is connected with the ARM system through SPI, and the two ends of the output contact of the trigger circuit are respectively connected with the power supply of the DSP system and the external interrupt pin, and also includes a touch screen, and the touch screen is connected with the The ARM system is connected; the acceleration sensor is used to measure the vibration signal of the circuit breaker casing, the trigger circuit is used to trigger the DSP external interrupt for sampling, and the DSP system is used for AD sampling, data processing and sending data to ARM system, the ARM system is used to receive the data sent by the DSP and process the data, save it and display it on the touch screen, the ARM system also includes a judging module to judge whether the circuit breaker is in normal state displayed on the touch screen. When the circuit breaker is to be tested, the acceleration sensor is first installed on the top of the circuit breaker casing, and the two input terminals of the trigger circuit are respectively connected to the two ends of the closing coil and the opening coil of the circuit breaker. At this time, the circuit breaker is operated. The casing will vibrate, and the acceleration sensor and the trigger circuit will get signals at the same time to start working. Since the acceleration sensor is connected to the signal processing module, the chip model used in the signal processing module of this system is CM3502, and the chip model of the acceleration sensor is CA-YD-180 , the signal processing module provides a constant current power supply for the acceleration sensor and simultaneously outputs the AC measured acceleration signal superimposed on the DC bias output by the acceleration sensor through the CR high pass to block the DC output, cut off the DC bias, and transmit the AC acceleration signal to DSP system, at the same time, due to the triggering of the trigger circuit, the external interrupt of the DSP system generates a falling edge and changes to a low level, and the DSP enters the sampling interrupt for data sampling, and uses the on-chip AD of the DSP to perform analog-to-digital conversion on the collected analog signal The digital signal is converted into a digital signal, and then the DSP decomposes the digital signal with a 3-layer wavelet packet based on the DB4 wavelet to obtain the energy entropy of 8 sequences, and obtain 8 entropy values as feature quantities. Send to the ARM system, the SPI driver module in the ARM system will enter the background interrupt after the SPI receives the data, automatically save the characteristic value of the vibration signal, and display the characteristic value on the touch screen. The characteristic quantity of the circuit breaker is compared with the characteristic quantity of the circuit breaker measured by the circuit breaker in the normal state detected in the past, and the state of the circuit breaker is obtained. Before judging the characteristic quantity in the ARM system, the SVM support vector Firstly, according to the above method, collect multiple groups of samples of the closing vibration signal feature quantity of the same type of circuit breaker in the normal state, mark them as normal samples, set the type of SVM to one-class-svm, and use This group of samples is trained. After the training is completed, there is no need to train again. It is only necessary to send the newly measured feature quantity into the SVM support vector machine for judgment. If it is judged to be of the same type, the circuit breaker is normal. There may be a fault, and the result will be displayed on the touch screen at the same time. The maintenance personnel can intuitively see the status of the circuit breaker on this system without additional comparison or calculation. This system is based on an embedded system and requires a small space , friendly human-computer interaction, convenient for maintenance personnel to judge the working status of the circuit breaker, prolong the service life of the circuit breaker, and the maintenance personnel can check the previous detection data through the touch screen, friendly human-computer interaction.

In addition, the above two systems can also use external AD sampling chips. There are many kinds of AD sampling chips. The chip model used here is AD7606. The AD chip is connected between the displacement sensor and the DSP system. Generally, the DSP The on-chip AD precision is 8 or 10 bits, while the AD7606 can reach 16 bits, which makes the AD conversion more accurate. The DSP chip used in this system is TMS320F28335, which has a 32-bit floating-point processing unit. Compared with the previous fixed-point DSP, this device has high precision, low cost, low power consumption, high performance, high integration of peripherals, And the advantages of large program storage capacity. The ARM chip used in this system is S3C6410. Compared with the previous ARM system, it has a higher main frequency and more abundant peripherals, and can be applied to embedded system applications that have higher requirements for performance and processing capabilities.

Moreover, the trigger circuits described in the above two systems include resistors and optocoupler relays. The optocoupler relay used here is of the type TLP3553. The input terminals of the optocoupler relays are connected in series with the resistors and connected in parallel to the closing coil and the opening coil respectively. Both ends, the two ends of the output contact are respectively connected to the power supply of DSP and the external interrupt pin. The optocoupler relay has no life, the light-emitting diode is turned on and off, and the receiving diode is turned on and off. It will not be broken due to aging, so the optocoupler The relay is suitable for the field of repeated switching.

The invention also introduces a method for collecting the vibration state of the circuit breaker casing. When the circuit breaker receives an opening or closing command, the two ends of the resistive photocoupler relay branch connected in parallel with the opening and closing coil obtain voltage at the same time, and the photocoupler The relay output contact is closed so that the DSP gets the signal, and the DSP external interrupt generates a falling edge and becomes low level. The DSP system provides the sampling clock for the external AD chip and reads the vibration signal after the analog-digital conversion. After the sampling is completed, if the circuit breaker is closed gate, the DSP decomposes the vibration signal with a 3-layer wavelet packet based on the DB4 wavelet to obtain 8 sequences, and calculates the energy entropy of these 8 sequences respectively, and the obtained 8 entropy values are used as feature quantities, and then the DSP converts the The data is sent to the ARM system, and the SPI driver module in the ARM system will interrupt in the background after the SPI receives the data, automatically save its characteristic quantity, and display the characteristic quantity on the touch screen. This method can make the maintenance personnel very intuitive Observing the characteristic quantity of the vibration state of the circuit breaker casing, it is easy to use and has high measurement accuracy. The maintenance personnel only need to compare this characteristic quantity with the characteristic quantity of the circuit breaker in the normal state measured in the past, and then the circuit breaker can be obtained. status.

In addition, a method for judging the vibration state of the circuit breaker casing is introduced. When the circuit breaker receives an opening or closing command, the two ends of the branch circuit of the resistive optocoupler relay connected in parallel with the opening and closing coil obtain voltage at the same time, and the optocoupler relay The output contact is closed so that the DSP gets the signal, and the DSP external interrupt generates a falling edge and becomes low level. The DSP system provides the sampling clock for the external AD chip and reads the vibration signal after the analog-to-digital conversion. After the sampling is completed, if the circuit breaker is closed , then the DSP decomposes the vibration signal with a 3-layer wavelet packet based on the DB4 wavelet, and obtains 8 sequences. The energy entropy of these 8 sequences is calculated respectively, and the obtained 8 entropy values are used as feature quantities, and then the DSP converts the data through SPI Sent to the ARM system, the SPI driver module in the ARM system will enter an interrupt in the background after the SPI receives the data, and automatically save its characteristic value. Before judging its feature quantity, it is necessary to train the SVM support vector machine algorithm. First, collect multiple groups of samples of the closing vibration signal feature quantity of the same type of circuit breaker in the normal state according to the above method, and mark it as a normal sample ; Set the type of SVM to one-class-svm, and use this set of samples for training. After the training is completed, the newly measured feature quantity is sent to the SVM support vector machine for judgment, and the result is displayed on the touch screen. This method can directly obtain the state of the circuit breaker by observing the touch screen, which is easy to use And the test is accurate, which is beneficial for the maintenance personnel to check the mechanical characteristics of the circuit breaker, prolonging the service life of the circuit breaker, and the maintenance personnel can check the previous detection data through the touch screen, and the human-computer interaction is friendly.

And, the closing vibration signal feature quantity samples under the normal state are not less than 30 groups, the more vibration signal feature quantity samples are obtained, the more accurate the closing vibration signal feature quantity under the normal state is, and at the same time, the detected The more accurate the breaker status is.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. The vibration state acquisition system of the circuit breaker casing is characterized in that: it comprises an acceleration sensor, a signal conditioning device, a trigger circuit, an SPI, a DSP system and an ARM system, the acceleration sensor is connected with the signal conditioning module, and the output terminal of the signal conditioning module It is connected with the DSP system, the DSP system is connected with the ARM system through SPI, the two ends of the output contact of the trigger circuit are respectively connected with the power supply of the DSP system and the external interrupt pin, and a touch display screen is also included, and the touch display screen is connected with the ARM system connect; The acceleration sensor is used to measure the vibration signal of the circuit breaker casing, the trigger circuit is used to trigger the DSP external interrupt for sampling, and the DSP system is used for AD sampling, data processing and sending data to the ARM system through SPI, so The above-mentioned ARM system is used to receive the data sent by the DSP, process the data, save it and display it on the touch screen. 2. The circuit breaker casing vibration state acquisition system as claimed in claim 1, is characterized in that: also comprise the AD sampling chip that is connected between signal conditioning module and DSP system, the model of described AD sampling chip is AD7606, so The DSP chip model in the DSP system is TMS320F28335, and the ARM chip model in the ARM system is S3C6410. 3. The system for collecting the vibration state of the circuit breaker casing according to claim 1, wherein the trigger circuit includes two sets of resistors and an optocoupler relay, and the two sets of resistors are respectively connected in series at two input terminals of the optocoupler relay. 4. The circuit breaker casing vibration state judgment system is characterized in that: it includes an acceleration sensor, a signal conditioning device, a trigger circuit, an SPI, a DSP system and an ARM system, the acceleration sensor is connected to the signal conditioning module, and the output terminal of the signal conditioning module It is connected with the DSP system, the DSP system is connected with the ARM system through SPI, the two ends of the output contact of the trigger circuit are respectively connected with the power supply of the DSP system and the external interrupt pin, and a touch display screen is also included, and the touch display screen is connected with the ARM system connect; The acceleration sensor is used to measure the vibration signal of the circuit breaker casing, the trigger circuit is used to trigger the DSP external interrupt for sampling, and the DSP system is used for AD sampling, data processing and sending data to the ARM system through SPI, so The ARM system is used to receive the data sent by the DSP and process the data, save it and display it on the touch screen. The ARM system also includes a judgment module to judge whether the state of the circuit breaker is normal and display the result on the touch screen show. 5. The circuit breaker casing vibration state judging system as claimed in claim 4, is characterized in that: also comprise the AD sampling chip that is connected between signal conditioning module and DSP system, the model of described AD sampling chip is AD7606, so The DSP chip model in the DSP system is TMS320F28335, and the ARM chip model in the ARM system is S3C6410. 6 . The system for judging the vibration state of a circuit breaker casing according to claim 4 , wherein the trigger circuit includes two sets of resistors and an optocoupler relay, and the two sets of resistors are respectively connected in series at two input terminals of the optocoupler relay. 7 . 7. The vibration state acquisition method of the circuit breaker, which is characterized in that: when the circuit breaker receives the opening or closing command, the two ends of the resistive optocoupler relay branch connected in parallel with the opening and closing coil obtain the voltage at the same time, and the optocoupler relay outputs The contact closure makes the DSP get the signal, the DSP external interrupt generates a falling edge and becomes low level, the DSP system provides the sampling clock for the external AD chip and reads the vibration signal after the analog-to-digital conversion. After the sampling is completed, if the circuit breaker is closed, Then the DSP decomposes the vibration signal with a 3-layer wavelet packet based on the DB4 wavelet to obtain 8 sequences, and calculates the energy entropy of these 8 sequences respectively, and the obtained 8 entropy values are used as feature quantities, and then the DSP sends the data through SPI For the ARM system, the SPI driver module in the ARM system will enter an interrupt in the background after the SPI receives the data, automatically save its characteristic value, and display the characteristic value on the touch screen. 8. The method for judging the vibration state of the circuit breaker casing, which is characterized in that: when the circuit breaker receives an opening or closing command, the two ends of the resistive optocoupler relay branch connected in parallel with the opening and closing coil obtain voltage at the same time, and the optocoupler The relay output contact is closed so that the DSP gets the signal, and the DSP external interrupt generates a falling edge and becomes low level. The DSP system provides the sampling clock for the external AD chip and reads the vibration signal after the analog-digital conversion. After the sampling is completed, if the circuit breaker is closed gate, the DSP decomposes the vibration signal with a 3-layer wavelet packet based on the DB4 wavelet to obtain 8 sequences, and calculates the energy entropy of these 8 sequences respectively, and the obtained 8 entropy values are used as feature quantities, and then the DSP converts the The data is sent to the ARM system. The SPI driver module in the ARM system will enter the background interrupt after the SPI receives the data, and automatically save its feature quantity. Before judging its feature quantity, the SVM support vector machine algorithm must be trained once: First, according to the above method, collect multiple groups of samples of the closing vibration signal characteristics of the same type of circuit breaker in the normal state, mark them as normal samples, set the type of SVM to one-class-svm, and use this group of samples for training; After the training is completed, the newly measured feature quantity is sent to the SVM support vector machine for judgment, and the result is displayed on the touch screen. 9 . The method for judging the vibration state of the circuit breaker casing according to claim 8 , characterized in that: there are no less than 30 samples of characteristic quantities of the closing vibration signal in the normal state. 10 .