CN203929362U - Mechanical property data collector based on breaker trip signal - Google Patents

Abstract

The utility model belongs to the technical field of circuit breakers, in particular to a mechanical characteristic data acquisition device based on circuit breaker travel signals. The utility model includes a circuit breaker; it also includes a stroke sensor, a voltage conditioning element, an AD conversion element, a clock element, a power supply element and a central processing unit. It is based on the contact stroke signal during the operation of the circuit breaker, and uses linear displacement sensors, voltage conditioning components, AD conversion components, clock components, power supply components and central processing units to realize data collection of the mechanical characteristics of the circuit breaker. On the basis of this data, the evaluation of the operating state of the circuit breaker can be further realized.

Description

Mechanical characteristic data acquisition device based on circuit breaker travel signal

technical field

The utility model belongs to the technical field of circuit breakers, in particular to a mechanical characteristic data acquisition device based on circuit breaker travel signals.

Background technique

The high-voltage circuit breaker is one of the important equipment in the power system, and its operation status directly affects the operation stability and power supply reliability of the power system. High-voltage circuit breakers mainly include three characteristics: mechanical characteristics, electrical characteristics and insulation characteristics. The research on the mechanical characteristics of circuit breakers can reflect more than 80% of faults. Improving the operational reliability of the power system has important practical significance.

At present, there are very few studies on the evaluation method of the operating status of high-voltage circuit breakers. The comprehensive evaluation of multiple signals is mainly used in the signal, but the most direct signal reflecting the mechanical characteristics of the circuit breaker is the contact stroke signal, and other signals are indirect signals. It is difficult to determine the weight of other indirect signals by comprehensive evaluation of multiple signals. Therefore, in-depth research on the operating state evaluation method of the mechanical characteristics of high-voltage circuit breakers is required, which has important practical significance for guiding the condition-based maintenance of circuit breakers and improving the operating reliability of power systems.

Contents of the invention

Aiming at the deficiencies in the prior art, the utility model provides a mechanical characteristic data acquisition device based on the stroke signal of the circuit breaker.

The technical scheme of the utility model is achieved in that:

A mechanical characteristic data acquisition device based on a circuit breaker stroke signal, comprising a circuit breaker; a stroke sensor, a voltage conditioning element, an AD conversion element, a clock element, a power supply element and a central processing unit.

For the travel sensor, a high-precision angular displacement sensor or a linear displacement sensor is selected according to the different installation methods of the circuit breaker; the power supply circuit of the sensor is connected to the voltage conditioning element, and its working voltage value is 12V and 24V. It is connected with the AD conversion element, and the output voltage range is 0-5V.

The voltage conditioning element can supply power to the stroke sensor, and can also convert the 5V voltage output by the AD conversion element into a 3.3V voltage acceptable to the central processing unit, and connect the above two elements.

The AD conversion element is mainly composed of ADS8364 chip and its peripheral circuits.

The central processing unit is mainly composed of a TMS320F28335 chip and its peripheral circuits.

The clock element is connected with the central processing unit and can provide sampling frequency for the AD conversion element.

The power supply element is connected with each element through the central processing unit, and can provide power for the whole device.

Advantage of the utility model and beneficial effect are as follows:

The utility model provides a mechanical characteristic data acquisition device based on the stroke signal of the circuit breaker. Based on the stroke signal of the contact during the operation process of the circuit breaker, a linear displacement sensor, a voltage conditioning element, an AD conversion element, a clock element, a power supply element and The central processing unit realizes the data acquisition of the mechanical characteristics of the circuit breaker. On the basis of this data, the evaluation of the operating state of the circuit breaker can be further realized.

Description of drawings

Fig. 1 is a structural block diagram of the utility model;

Fig. 2 is the schematic diagram of the linear position sensor in the utility model;

Fig. 3 is the 12V/24V input voltage level conversion circuit as shown in the utility model;

Fig. 4 is a circuit diagram of the 0-5V level conversion element in the utility model;

Fig. 5 is the schematic diagram of 5V～3.3V level conversion circuit in the utility model;

Fig. 6 is the circuit schematic diagram of the AD conversion element in the utility model;

Fig. 7 is an explanatory diagram of the central processing unit connector 10 pins in the utility model;

Fig. 8 is an explanatory diagram of the pins of the central processing unit connector 11 in the utility model;

Fig. 9 is a data diagram of the actual measurement data of the contact stroke opening and closing signals of the circuit breaker of the utility model;

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail.

As shown in Figure 1, a mechanical characteristic data acquisition device based on a circuit breaker stroke signal includes a circuit breaker, a stroke sensor, a voltage conditioning element, an AD conversion element, a clock element, a power supply element, and a central processing unit.

The stroke sensor described in the utility model selects a high-precision angular displacement sensor or a linear displacement sensor according to the different installation methods of the circuit breaker; the power supply circuit of the sensor is connected with a voltage conditioning element, and its working voltage value is 12V and 24V. , the signal loop is connected with the AD conversion element, and the output voltage range is 0-5V.

The voltage conditioning element can supply power to the stroke sensor, and can also convert the 5V voltage output by the AD conversion element into a 3.3V voltage acceptable to the central processing unit, and connect the above two elements.

The clock element is connected with the central processing unit and can provide sampling frequency for the AD conversion element.

The power supply element is connected with each element through the central processing unit, and can provide power for the whole device.

In this embodiment, the circuit breaker adopts a ZW45 monostable permanent magnet mechanism circuit breaker with a vacuum of 10kV.

The circuit breaker contact stroke sensor adopts a resistive linear displacement sensor with a measuring range of 50mm. It is characterized by simple structure, convenient installation, low cost, wide applicable temperature range, and redundant features. The working principle is shown in Figure 2. During the implementation, the displacement sensor is installed on the insulating pull rod of the B phase of the circuit breaker.

The circuit breaker needs to provide voltage to the sensor when collecting the travel signal of the contactor. The higher the voltage, the higher the signal-to-noise ratio of the sensor output signal. According to the existing power supply conditions, considering the limitation of power consumption and temperature rise, two schemes of 24V and 12V are selected, and the output signal is reduced to between 0 and 5V through the step-down circuit.

The 12V/24V input voltage level conversion circuit is shown in Figure 3. In the circuit, the OP07 operational amplifier is used to build a follower, which has high input impedance and low output impedance, which acts as a buffer stage and an isolation stage to meet the characteristics of impedance matching at both ends of the circuit.

Since the AD conversion element has the characteristics of differential input, the level conversion circuit can be designed through the operational amplifier to accept bipolar input, and the acquisition range of the AD conversion element is expanded from 0V to 5V to -5V to +5V. The level conversion circuit is shown in Figure 4. The function of this circuit is to convert the signal output by the stroke sensor into a 0-5V signal.

The output signal of the AD acquisition component is between 0 and 5V, while the power supply of the central processing unit is 3.3V, so a level conversion circuit needs to be added between the two. The chip can control the input and output directions of the chip pins by controlling the DIR function of the 1st pin and the 24th pin. The input end can be connected to a 3.3V or 5V power supply, and the output can be connected to a 3.3V circuit. The schematic diagram of the circuit is shown in Figure 5.

The AD conversion component is mainly composed of the ADS8364 chip and its peripheral circuits. Its advantage is that it can collect six channels of analog signals at the same time, the effective precision is 16 bits, and the frequency is as high as 250kHz. The circuit schematic diagram of the AD conversion element is shown in Figure 6. The acquisition frequency of the trip signal of the circuit breaker is set to 10kHz, which meets the sampling requirements of the signal.

The central processing unit is mainly composed of the TMS320F28335 chip and its peripheral circuits. The main features: (1) fast processing speed, main frequency 150MHz; (2) built-in SRAM, Flash; (3) external memory interface; (4) numerous External devices, such as SCI, SPI, CAN, EV, ADC, etc.; (5) A large number of controllable GPIO ports. The digital signal processor supports programming in C and other languages. The storage space of its memory is large, and can be used as the collection, calculation, and transmission operations of a large amount of data; Fig. 7 is an explanatory diagram of the central processing unit connector 10 pins in the utility model, wherein AD0 is the AD of the displacement signal of the circuit breaker Input pin; FIG. 8 is an explanatory diagram of the central processing unit connector 11 pins in the utility model.

Fig. 9 is an actual measurement data diagram of the opening and closing signal of the contact stroke of the circuit breaker of the utility model.

Claims (5)

1. the mechanical property data collector based on breaker trip signal, comprise isolating switch, it is characterized in that: also comprise stroke sensor, voltage conditioning element, AD conversion element, clock element, source element and CPU (central processing unit), described CPU (central processing unit) is mainly made up of TMS320F28335 chip and peripheral circuit thereof, and described AD conversion element is mainly made up of ADS8364 chip and peripheral circuit thereof.

2. the mechanical property data collector based on breaker trip signal according to claim 1, is characterized in that: described stroke sensor, select high-precision angular displacement sensor or linear displacement transducer according to the difference of isolating switch mounting means; The current supply circuit of this sensor is to be connected with voltage conditioning element, and its operational voltage value is two kinds of 12V and 24V, and signal circuit is connected with AD conversion element, and the voltage range of output is 0～5V.

3. the mechanical property data collector based on breaker trip signal according to claim 1, it is characterized in that, described voltage conditioning element, can be stroke sensor power supply, the 5V voltage transitions of AD conversion element output can also be become to the receptible 3.3V voltage of CPU (central processing unit), and above-mentioned two elements are connected.

4. the mechanical property data collector based on breaker trip signal according to claim 1, is characterized in that, described clock element is connected with CPU (central processing unit), can be AD conversion element sample frequency is provided.

5. the mechanical property data collector based on breaker trip signal according to claim 1, is characterized in that, described source element is connected with each element by CPU (central processing unit), can be whole device power supply is provided.