CN207439671U - A kind of frame-type circuit breaker mechanical fault diagnosis device based on industrial personal computer - Google Patents

Abstract

The utility model relates to a mechanical fault diagnosis device for a frame type circuit breaker based on an industrial computer. The composition of the device includes: industrial computer, I/O control board, energy storage control module, opening and closing control module, sensor module, signal conditioning module, data acquisition module and power supply module; among them, the industrial computer and I/O control The boards are connected; the I/O control boards are respectively connected with the energy storage control module and the opening and closing control module; the power module is respectively connected with the opening and closing control module, the sensor module, and the signal conditioning module; the sensor module is respectively connected with the signal conditioning module, The data acquisition module is connected; the signal conditioning module is connected with the data acquisition module; the data acquisition module is connected with the industrial computer. The device of the utility model realizes the mechanical failure diagnosis of the operation accessories and the contact system operating mechanism during the operation process through the whole detection of the circuit breaker action; at the same time, whether the circuit breaker is effectively closed or opened during the opening and closing process Make precise judgments.

Description

A Mechanical Fault Diagnosis Device of Frame Circuit Breaker Based on Industrial Computer

technical field

The utility model belongs to a circuit breaker fault diagnosis device, in particular to a frame type circuit breaker mechanical fault diagnosis device based on an industrial computer.

Background technique

As the key equipment in the low-voltage distribution network, the frame circuit breaker's operation reliability is directly related to the reliable operation of the distribution network. With the continuous expansion of the quantity and scale of distributed power generation resources such as renewable resources, the demand for frame circuit breakers is also increasing. Quality inspection is crucial. As the core control part of circuit breaker operation, the operating accessories are particularly important for the reliable operation of the circuit breaker. As the executive mechanism of the circuit breaker, the operating mechanism of the contact system is directly related to the effectiveness of the opening and closing of the circuit breaker. Therefore, for Before the circuit breaker leaves the factory, it is necessary to carry out the test test to check whether the operating accessories and the operating mechanism have potential failures.

At present, the mechanical fault diagnosis device of the circuit breaker mainly completes the diagnosis by detecting the sound signal during the operation of the circuit breaker, the stroke signal of the moving contact, the rotation angle signal of the main shaft, and the force signal of the contact. However, these signal measurement methods are either susceptible to on-site interference, or damage the mechanical structure of the circuit breaker body, and the signals detected on this basis can no longer accurately reflect the weak changes in the mechanical structure state of the circuit breaker during actual operation. The study found that the current signal of the operating accessories contains a large amount of mechanical information of the control loop and its interlocking mechanical structure. At the same time, the current signal has the characteristics of high stability and easy detection, which can be one of the parameters for circuit breaker state detection. When the circuit breaker is opening and closing, due to the violent vibration caused by the operation of the internal mechanical structure and the impact of the contacts, any state change of the operating mechanism will be reflected in the vibration signal, so the vibration signal during the opening and closing process of the circuit breaker can be detected , to aid in mechanical fault diagnosis of the contact system. Compared with the current fault diagnosis device, the diagnostic device based on the above detection parameters can greatly increase the types of faults that can be diagnosed, and the accuracy of fault diagnosis is also significantly improved.

The mechanical action process of the circuit breaker is divided into three links: energy storage, closing and opening, all of which are controlled by the operating accessories, and all the action processes of the three links are detected to achieve more comprehensive fault diagnosis. When the circuit breaker is opening and closing, there is a situation of disconnection and closing failure. At this time, the detection signal cannot accurately reflect the operating status of the circuit breaker’s operating accessories and operating mechanism, and the diagnostic results made by the device lose validity. This device passes Construct the DC circuit of the main contact of the circuit breaker, and use the voltage sensor to detect the voltage drop of the main contact of the circuit breaker. Limit value, the opening and closing operation of the circuit breaker is valid, otherwise, it is directly judged as an opening and closing failure fault. Since the frame type circuit breaker operating accessory coil is powered by alternating current, the influence of the initial phase of the power supply on the operating characteristics of the operating accessory should be considered, but the energy storage time of the energy storage motor lasts for a long time, and the influence of the phase of the power supply can be ignored; while the opening and closing The energization time of the coil is short, and the initial phase has a great influence on its operating characteristics. It is necessary to consider the influence of the initial phase of the power supply. Therefore, in order to ensure the accuracy of fault diagnosis, the device can be selected in the selected phase during the factory test and fault diagnosis test. Connect the opening and closing coil circuit to perform opening and closing operation.

Utility model content

The purpose of this utility model is to provide a frame-type circuit breaker mechanical fault diagnosis device based on an industrial computer. The device completes the action control and signal acquisition of the frame-type circuit breaker through components such as an industrial computer, a control board, a sensor, and an acquisition card. And the validity detection of opening and closing. Use 1 voltage sensor to collect the power supply voltage of the opening and closing coil circuit, so that the industrial computer can issue an opening and closing action command under the selected phase of the opening and closing coil circuit power supply voltage; use 3 current sensors to detect the energy storage and closing of the circuit breaker respectively The current signal of the operating accessories in the three stages of opening and opening is used to complete the mechanical fault diagnosis of the operating accessories; one acceleration sensor is used to detect the opening and closing vibration signals to complete the mechanical fault diagnosis of the contact system; when the above current detection is performed , Three voltage sensors are used to detect the voltage of the DC circuit of the three-phase main contact of the circuit breaker respectively, and judge whether the circuit breaker has carried out effective opening and closing operations.

The technical scheme of the utility model is:

A mechanical fault diagnosis device for a frame type circuit breaker based on an industrial computer. The device includes: an industrial computer, an I/O control board, an energy storage control module, an opening and closing control module, a sensor module, a signal conditioning Acquisition module and power module;

Among them, the industrial computer is connected with the I/O control board; the I/O control board is connected with the energy storage control module and the opening and closing control module respectively; the power module is respectively connected with the opening and closing control module, the sensor module and the signal conditioning module The sensor module is respectively connected with the signal conditioning module and the data acquisition module; the signal conditioning module is connected with the data acquisition module; the data acquisition module is connected with the industrial computer.

The energy storage control module includes a solid state relay and a contactor, and the two are connected;

The opening and closing control module is composed of an independent closing control circuit and an opening control circuit, both of which are composed and connected in the same way, and are composed of ULN2003, optocoupler and bidirectional thyristor TH in series;

The sensor module is composed of 3 current sensors, 4 voltage sensors and 1 built-in IC piezoelectric acceleration sensor, and the 8 sensors are independent of each other;

The signal conditioning module is composed of mutually independent voltage conditioning circuits, current conditioning circuits and vibration conditioning circuits;

The data acquisition module is a data acquisition card;

The power supply modules are independent DC stabilized power supplies and switching power supplies.

The substantive features of the utility model are:

The device of the utility model is used for the factory test and fault diagnosis test of the frame type circuit breaker. When the mechanical failure of the operation accessories and the contact system operating mechanism occurs during the operation of the circuit breaker, it can ensure that the fault can be found in time and accurately, and at the same time Detect whether the circuit breaker has action failure, and improve the product quality and operation reliability of the circuit breaker before leaving the factory.

The device involves the relevant signal detection during the mechanical action of the frame circuit breaker. When the circuit breaker is in effective operation, the detection of the current signal of the operating accessories is the main method, and the vibration signal detection of the contact system is supplemented. When the factory test and fault diagnosis test of the circuit breaker are required, the fault diagnosis device can be performed by combining the current signal of the operating accessories and the vibration signal of the contact system.

The beneficial effects of the utility model are: the device of the utility model does not need to manually operate the circuit breaker when detecting the current, voltage and vibration signal, the energy storage operation can be completed by connecting the energy storage motor coil with the action of the energy storage control module, and the opening and closing operation can be completed by the opening and closing The gate control module completes the opening and closing coil circuit; the current signal and vibration signal sensitive to the mechanical state change of the circuit breaker are selected for detection, and different sensors are used to collect the current signal of the operating accessories in real time, and the detection method is more reasonable and effective , to realize the whole process detection of the circuit breaker action; in the process of opening and closing, it can make an accurate judgment on whether the circuit breaker is effectively closed and opened.

It is reflected in:

1. The detection method is convenient and effective. The sensors are all installed in a non-invasive way, which will not cause damage to the mechanical structure of the circuit breaker body; different parts are detected by different sensors, which are highly targeted and can accurately reflect the mechanical structure changes during the operation of the circuit breaker; The accuracy of subsequent fault diagnosis of the device.

2. When the circuit breaker is closing and opening, the device detects the voltage drop of the main contact through the voltage sensor, and judges whether the operating mechanism drives the circuit breaker to complete the closing and opening operations reliably, and then checks whether the opening and closing of the circuit breaker is invalid. determination.

3. This device can control the phase of the power supply when the opening and closing coil circuit of the circuit breaker is turned on, and detect the current characteristics of the opening and closing coil circuit under different phases.

4. The high-performance industrial control computer in the device can automatically store the test data for future query, and has built-in advanced data processing and analysis software, which is convenient for the operation and use of testers.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is a composition and structure diagram of the utility model device, wherein the new detection device is inside the dotted line frame.

Fig. 2 is a circuit diagram of the circuit breaker energy storage control module of the utility model device.

Fig. 3 is a schematic diagram of signal acquisition of the device of the present invention.

Fig. 4 is the peripheral wiring diagram 1 of the voltage sensor of the device of the present invention.

Fig. 5 is the peripheral wiring diagram 2 of the voltage sensor of the device of the present invention.

Fig. 6 is a wiring diagram of the current sensor of the device of the present invention.

Fig. 7 is a wiring diagram of the vibration sensor of the device of the present invention.

Fig. 8 is a current/voltage conditioning circuit diagram of the device of the present invention.

Fig. 9 is a vibration conditioning circuit diagram of the device of the present invention.

Fig. 10 is a circuit diagram of the main contact DC circuit of the utility model device.

Fig. 11 is a schematic diagram of the closing control circuit in the opening and closing control module of the device of the present invention.

Fig. 12 is a flow chart of fault diagnosis of the device of the present invention.

Fig. 13 is a signal test diagram of the industrial computer of the device of the present invention.

Detailed ways

The utility model is described below in conjunction with accompanying drawing, but they are not the limitation of protection scope of the utility model.

The device of the utility model is a frame-type circuit breaker mechanical fault diagnosis device based on an industrial computer. The overall structural block diagram is shown in the dotted line box in Fig. Energy control module 3, opening and closing control module 4, sensor module 5, signal conditioning module 6, data acquisition module 7 and power supply module 8;

Among them, the industrial computer 1 is connected to the I/O control board 2; the I/O control board 2 is connected to the energy storage control module 3 and the opening and closing control module 4 respectively; the power module 8 is respectively connected to the opening and closing control module 4, The sensor module 5 is connected to the signal conditioning module 6; the sensor module 5 is connected to the signal conditioning module 6 and the data acquisition module 7 respectively; the signal conditioning module 6 is connected to the data acquisition module 7; the data acquisition module 7 is connected to the industrial computer 1; the energy storage control Module 3 is connected to the coil circuit of the energy storage motor of the circuit breaker test product; the opening and closing control module 4 is respectively connected to the closing coil circuit and the opening coil circuit of the circuit breaker test product.

The specific connection method is as follows:

Industrial computer 1 adopts Advantech IPC-610 industrial computer;

I/O control board 2 adopts Advantech PCL-720+ board;

The energy storage control module 3 includes a solid state relay and a contactor, and the two are connected. The solid state relay can be preferably Omron G3MC-202PL, and the contactor can be preferably CJX2-1210 of China People's Electric Appliances; the control circuit shown in Figure 2 shows that the industrial computer communicates with the solid state relay in the energy storage control module 3 through the I/O control board 2 Operate, and then control the energy storage motor through the on and off of the contactor.

The power supply of the energy storage motor coil, closing coil and opening coil in the operation accessories of the circuit breaker is consistent. For the power supply of the energy storage motor coil, the phase of the power supply when the circuit is connected can be ignored, and the current is relatively large, and the energy storage can be selected. Control module 3: The phase of the power supply when the opening and closing coil is energized needs to be considered, so as to realize the rapid connection of the circuit at a suitable phase, and the opening and closing control module 4 is selected, its switching speed is fast, and the switching function can be realized in different phases .

The opening and closing control module 4 is composed of separate closing control circuits and opening control circuits, both of which are composed and connected in the same way, and are all composed of ULN2003U4, optocoupler U5 and bidirectional thyristor TH in series, wherein the closing Gate control circuit schematic diagram shown in Figure 11. The drive signal generated by the I/O control board is pulled up by R14 to 5V and connected to the input terminal of ULN2003U4 for amplification. The output of U4 is connected to the optocoupler U5 through R17. TH is connected, and TH is connected to the opening and closing coil circuit to control the opening and closing coil on and off.

The sensor module 5 is composed of 3 current sensors CHF-10P, 4 voltage sensors CHV-25P and 1 built-in IC piezoelectric acceleration sensor LC0159, and the 8 sensors are independent of each other. The three voltage sensors in the sensor module 5 that detect the DC circuit voltage of the three-phase main contacts are directly connected to the data acquisition module 7, and the remaining one voltage sensor that detects the voltage of the power supply at both ends of the opening and closing coil, three current sensors and one An acceleration sensor is connected with the signal conditioning module 6. The vibration sensor is powered by a constant current source, the constant current source is connected to the power module 8, and the power supply voltage is 24V, and the remaining 7 sensors are directly connected to the power module 8 for power supply, and the power supply voltage is ±15V. Since the three voltage sensors for detecting DC voltage only need to perform voltage jump measurement processing and do not need signal conditioning, the three voltage sensors can be directly connected to the three acquisition channels CH3, CH4, and CH5 in the data acquisition module 7 . The installation method of the current sensor is: connect with the electrical connection wires of the energy storage motor coil, closing coil and opening coil in the accessory; the installation method of the voltage sensor is: connect Hall voltage sensors 1, 2 and 3 to the main contact The DC circuit is connected. The circuit is composed of three-phase main contacts of circuit breakers A, B and C and the DC stabilized power supply in the power module 8. The circuit is switched on and off by closing and disconnecting the main contacts. The circuit diagram of the DC circuit is shown in As shown in Figure 10, the other voltage sensor 4 is connected to the electrical connection wires of the power supply at both ends of the opening and closing coil; the acceleration sensor is installed in the following way: vertically installed at the intermediate phase position of the base beam of the circuit breaker sample. The ground terminals of the eight sensors in the sensor module are connected to each other and share the ground, and the connection method is shown in FIG. 3 .

The sensor connection is a known technology, wherein the external wiring of the 4 voltage sensors includes 2 different wiring methods, the wiring of the 3 voltage sensors connected to the main contact DC circuit is consistent, which is the voltage sensor wiring diagram 1, the main Detect the voltage at both ends of the contact, as shown in Figure 4; the wiring diagram of the voltage sensor connected to the electrical connection line of the power supply at both ends of the opening and closing coil is voltage sensor wiring diagram 2, which mainly detects the AC 380V power supply voltage, as shown in Figure 5 shown. In addition, the wiring diagram of the current sensor is shown in Figure 6, and the wiring diagram of the vibration sensor is shown in Figure 7.

The signal conditioning module 6 is composed of a voltage conditioning circuit, a current conditioning circuit and a vibration conditioning circuit, wherein the current conditioning circuit is the same as the voltage conditioning circuit, and the vibration conditioning circuit is different from the two, and the conditioning circuits are independent of each other. Each conditioning circuit is connected with sensor module 5 , data acquisition module 7 and power supply module 8 . Specifically, the power supply terminals ±15V and ±10V of the conditioning circuit are connected to the power supply module 8, the IN terminals of each conditioning circuit are respectively connected to the signal output terminals of the five sensors in the sensor module 5, and the OUT terminals are respectively connected to the five sensors in the data acquisition module 7. The acquisition channels CH0, CH1, CH2, CH6, and CH7 are connected. Each conditioning circuit is designed with integrated operational amplifiers, chip resistors and Zener diodes. The integrated operational amplifier is used as the core component, and the manufacturer GTC's LM339 can be selected;

The three conditioning circuits involved in the described signal conditioning module 6 are known technologies, and the current/voltage signal conditioning circuit is as shown in Figure 8. This circuit is a second-order active low-pass filter, and the cut-off frequency of the filter is 2.5kHz , characterized by stable output voltage and strong load capacity. The diode limiter circuit at the back end can ensure that the input meets the voltage requirements of the data acquisition card, namely -10 ~ +10V. The vibration conditioning circuit is shown in Figure 9. The second-order active low-pass filter is used to filter the signal, and the cut-off frequency of the filter is 10kHz.

The data acquisition module 7 adopts a PCL-818HD data acquisition card.

The power supply module 8 is an independent DC stabilized power supply and a switching power supply. The DC stabilized power supply can be preferably GPC-3060D, and the switching power supply can be specifically Mingwei Q-120C and D-60F10.

The operation process of the device: the device first performs the initialization operation; the industrial computer sends an action command through the I/O control board 2 to operate the energy storage control module 3, which is used to control the energy storage action of the circuit breaker, and then the energy storage ends; By detecting the power supply voltage of the opening and closing coil circuit, the phase of the power supply is determined. After a delay operation, under the selected phase, the industrial computer sends a closing command through the I/O control board 2, and is controlled by the opening and closing control module 4. The circuit breaker closes, and then the closing is completed; the industrial computer sends an opening command through the I/O control board, and the opening and closing control module 4 controls the circuit breaker to perform the opening operation. The phase selection of the opening operation is similar to that of closing , so far, one action cycle of the circuit breaker is over. When the above action is in progress, the sensor collects the signal, and uploads the data to the industrial computer through the data acquisition card, and the industrial computer performs the data display, analysis and processing of this action.

When the designed frame type circuit breaker operating mechanical fault diagnosis device is used in the factory test of the circuit breaker, Figure 12 is its fault diagnosis flow chart. Among them, after obtaining the current signal envelope for the current signal of the energy storage motor, the wavelet packet decomposition method is used to extract the energy coefficient for feature extraction; for the opening and closing coil current signal and vibration signal, the wavelet packet decomposition method is directly used to extract the energy coefficient method for feature extraction. The identification of fault type is completed by support vector machine, and the current signal and vibration signal generated by the circuit breaker operation process can be processed by the program based on the LabVIEW platform on the industrial computer to obtain the corresponding mechanical fault type. The program of the LabVIEW platform is a commonly used method in the field. Under the condition of clear device composition and clear function, ordinary technicians can easily write it out, which is a known technology.

Fig. 13 is the signal test diagram of the industrial computer of the device of the present invention, that is, to collect the coil current of the operation accessory of the circuit breaker and the vibration signal of the contact system, store the data of the collected signals, and obtain the corresponding signal according to the mechanical state during the operation of the circuit breaker type of failure.

The programs and protocols involved in the utility model are provided by the device or are known technologies.

Matters not mentioned in the utility model are known technologies.

Claims (2)

1. a kind of frame-type circuit breaker mechanical fault diagnosis device based on industrial personal computer, it is characterized in that the composition of the device includes： Industrial personal computer, I/O Control cards, energy storage control module, divide-shut brake control module, sensor assembly, Signal-regulated kinase, data are adopted Collect module and power module；

Wherein, industrial personal computer is connected with I/O Control cards；I/O Control cards respectively with energy storage control module, divide-shut brake control module It is connected；Power module is connected respectively with divide-shut brake control module, sensor assembly, Signal-regulated kinase；Sensor assembly is distinguished It is connected with Signal-regulated kinase, data acquisition module；Signal-regulated kinase is connected with data acquisition module；Data acquisition module with Industrial personal computer is connected.

2. the frame-type circuit breaker mechanical fault diagnosis device based on industrial personal computer as described in claim 1, it is characterized in that described Energy storage control module include solid-state relay and contactor, the two is connected；

The divide-shut brake control module is made of each independent contacting controling circuit with sub-gate control circuit, the two composition, Connection mode is consistent, in series by ULN2003, optocoupler and bidirectional triode thyristor TH；

The composition of the sensor assembly is 3 current sensors, 4 voltage sensors and 1 built-in IC piezoelectric type accelerate Sensor is spent, 8 sensors are mutual indepedent；

The Signal-regulated kinase is by mutually independent voltage modulate circuit, current regulating circuit and vibration modulate circuit group Into；

The data acquisition module is data collecting card；

The power module is each independent D.C. regulated power supply and Switching Power Supply.