Servo drive integrated circuit breaker characteristic debugging system

Abstract

The invention relates to the field of high-voltage circuit breakers, in particular to a characteristic debugging system for a servo drive integrated circuit breaker. The system comprises a direct-current power supply, a servo driver, a rotation sensor, a direct-current power supply, a servo motor and a computer. The direct-current power supply is connected in series with an inlet / outlet port of the circuit breaker, and a parallel resistor is connected in parallel in a loop; the input port of the servo driver is connected with a connecting lead led out from the inlet / outlet port of the circuit breaker in parallel; the rotation sensor is installed at the shaft end of the circuit breaker transmission system, and the rotation sensor transmits a voltage change signal to an input port of the servo driver; the direct-current power supply supplies power to the rotary sensor; the servo motor is installed on the circuit breaker and transmits driving force to the circuit breaker through the circuit breaker transmission system. And the computer receives a voltage signal acquired by the servo driver. The characteristics of the circuit breaker are detected by adopting a simple structure, the characteristics and information of the servo motor can be transmitted and reflected on a computer, and the overall cost is low.

Description

Technical Field

[0001] This invention relates to the field of high-voltage circuit breakers, and in particular to a characteristic debugging system for servo-driven integrated circuit breakers. Background Technology

[0002] The mechanical characteristics of circuit breakers and GIS disconnectors are the most fundamental factors for evaluating their performance. Conventional characteristic testing is performed using an external mechanical characteristic tester. The conventional method for breaking point testing is as follows: the characteristic tester supplies DC 24V to the circuit breaker's breaking point. When the switch is open, the moving and stationary contacts separate, and the voltage detected is the DC 24V voltage from the power supply side. The voltage value detected by the characteristic tester indicates that the circuit breaker is in the open state. When the switch is closed, the moving and stationary contacts close, and this measurement circuit is closed. Since the resistance of the switch is very small (in the μΩ range), the voltage value shared by the circuit breaker is very small, almost zero. The characteristic tester detects a very small voltage value and considers the circuit breaker to be in the closed state. This is the principle of the characteristic tester for breaking point testing of circuit breakers. The characteristic curve of a circuit breaker is obtained by a characteristic instrument as follows: a rotary or linear sensor, often in the form of a sliding resistor, is installed at the shaft end or tie rod of the circuit breaker's drive system. A certain DC voltage is supplied to this sensor, and during switch operation, the sliding resistor transmits a constantly changing voltage value, which is displayed as a changing characteristic curve on the characteristic instrument. By inputting the switch's travel value into the characteristic instrument, the voltage value is converted into travel data according to a conversion algorithm, and the switch's motion curve is displayed on the characteristic instrument. Combined with the detection of the circuit breaker's break point, a complete characteristic curve can be obtained. By defining the circuit breaker's speed (e.g., 10ms before closing and after opening), the speed characteristics of the circuit breaker in each time period can be obtained.

[0003] However, the traditional method of measuring mechanical characteristics requires the use of a characteristic tester to perform characteristic testing on circuit breakers. The price of a characteristic tester ranges from tens of thousands to hundreds of thousands of yuan, making the purchase cost expensive. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the background technology by proposing a characteristic debugging system for servo-driven integrated circuit breakers. Based on the circuit breaker structure powered by a servo motor and the signal acquisition function of the motor driver, a simple structure is used to detect the circuit breaker characteristics. The system can also transmit and display the information of the servo motor on a computer, resulting in low overall cost.

[0005] The technical solution of this invention provides a servo-driven integrated circuit breaker characteristic debugging system, comprising a DC power supply, a servo driver, a rotary sensor, a DC power supply, a servo motor, and a computer. The DC power supply is connected in series at the circuit breaker's inlet / outlet ports and in parallel with a parallel resistor in the circuit. The servo driver's input port is connected to a connecting wire extending in parallel from the circuit breaker's inlet / outlet ports. The rotary sensor is mounted on the shaft end of the circuit breaker's drive system, transmitting voltage change signals to the servo driver's input port. The DC power supply powers the rotary sensor. The servo motor is mounted on the circuit breaker, transmitting driving force to the circuit breaker through the circuit breaker's drive system. The computer receives the voltage signals collected by the servo driver and displays the voltage change signal curve on the driver software.

[0006] Preferably, the parallel resistor has a resistance of 50-100KΩ.

[0007] Preferably, the rotary sensor is a sliding resistor structure.

[0008] Preferably, the DC power supply voltage is 2V and the DC power supply voltage is 9V.

[0009] Preferably, when the circuit breaker opens, the voltage at the input port of the servo driver changes from 0V to 2V at the instant the circuit breaker opens; when the circuit breaker closes, the voltage at the input port of the servo driver changes from 2V to 0V at the instant the circuit breaker closes.

[0010] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention is based on a circuit breaker structure powered by a servo motor and the signal acquisition function of the motor driver. It adopts a simple structure to realize the detection of circuit breaker characteristics, accurately measure the circuit breaker stroke, speed, time, and break position, and display the voltage change signal curve and stroke change curve on the same cross section of the computer to obtain a complete characteristic curve. It can also be transmitted and displayed on the computer along with the information of the servo motor. The overall cost is low, saving the purchase cost of tens of thousands or hundreds of thousands of yuan for characteristic instruments. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention. Detailed Implementation

[0012] like Figure 1 As shown in the figure, this embodiment proposes a characteristic debugging system for servo-driven integrated circuit breakers, which includes a DC power supply, a servo driver, a rotary sensor, a DC power supply, a servo motor, and a computer.

[0013] The DC power supply voltage is 2V, and either a rechargeable battery or a storage battery can be used. The DC power supply is led out through a wire and connected in series to the circuit breaker's inlet / outlet ports. A parallel resistor with a resistance of 50-100KΩ is connected in parallel in the circuit. The servo drive input port is connected to the connecting wire led out in parallel from the circuit breaker's inlet / outlet ports.

[0014] The DC power supply has a voltage of 9V and powers the rotary sensor. The rotary sensor is a sliding resistor structure and is mounted on the shaft end of the circuit breaker drive system. The rotary sensor transmits voltage change signals to the input port of the servo driver.

[0015] The servo motor is mounted on the circuit breaker, and the servo motor transmits the driving force to the circuit breaker through the circuit breaker's drive system.

[0016] The computer receives the voltage signal collected by the servo driver and displays the voltage change signal curve on the driver software. When the circuit breaker opens, the moving and stationary contacts of the circuit breaker separate. At the instant the circuit breaker opens, the voltage at the input port of the servo driver changes from 0V to 2V. The voltage detected at this time is the DC 2V voltage on the power supply side. The voltage value detected by the characteristic instrument at this time indicates that the circuit breaker is in the open state. When the circuit breaker closes, the moving and stationary contacts of the circuit breaker close. This measurement circuit is closed. Since the resistance of the circuit breaker switch is very small (in the μΩ range), the voltage value borne by the circuit breaker at this time is very small, almost zero. The characteristic instrument detects a very small voltage value. At the instant the circuit breaker closes, the voltage at the input port of the servo driver changes from 2V to 0V. This voltage change shows the state of the break point just closing, indicating that the circuit breaker is in the closed state at this time. The above is the principle of circuit breaker break point detection.

[0017] Based on the correspondence between voltage and stroke, a conversion algorithm is used to convert voltage values ​​into stroke data, which is then displayed on the characteristic instrument as the circuit breaker's motion curve. A rotary sensor is fixed to the end of the drive shaft of the circuit breaker's transmission system. When the circuit breaker operates, the servo motor drives the drive shaft to rotate through the transmission system, causing the sliding rheostat inside the rotary sensor to rotate. Since the supply voltage is 9V, the continuously rotating rheostat outputs a changing voltage. Taking the circuit breaker closing action as an example: at the initial stage of the circuit breaker's closing action, the voltage transmitted by the rotary sensor is 2V; after the circuit breaker closes, the voltage transmitted by the rotary sensor is 9V. During the operation, the rotary sensor outputs a changing voltage from 2V to 9V. The circuit breaker's closing stroke is 85mm. That is, for every 85mm of movement, the voltage change of the rotary sensor is 9-2=7 (V). 85mm / (9-2)V * current voltage value = current circuit breaker stroke, where the current voltage value is the voltage value output by the rotary sensor at that moment. Since the rotation of the rotary sensor is a continuous voltage change curve, a continuously changing stroke curve can be obtained using the above calculation method. The servo driver will continuously detect the feedback voltage value, and the stroke change curve can be obtained using the above formula. The above formula needs to be programmed in the servo driver software.

[0018] This embodiment utilizes a circuit breaker structure powered by a servo motor and leverages the signal acquisition function of the motor driver. A simplified structure is employed to detect circuit breaker characteristics, enabling precise measurements of the circuit breaker's travel, speed, time, and break position. Voltage change curves and travel change curves are displayed on the same screen on the computer, providing a complete characteristic curve. This information, along with servo motor data, is transmitted and displayed on the computer, resulting in low overall cost. The sliding scale in the driver software allows for the measurement of speed characteristics over any time period. While commonly used characteristic analyzers only provide travel-time curves, the driver analysis software uses a differentiating tool to obtain the speed-time curve at any given moment. Moving the scale on the speed-time curve reveals the acceleration at any given time. The servo motor's angle, speed, current, and voltage are also displayed on the same interface, clearly showing the relationship between the circuit breaker characteristics and the various characteristics of the servo motor. Furthermore, based on the time relationship, it can also determine the time lag between the circuit breaker action and the servo motor action, and further improve the structural design so that the force or torque is better transmitted to the moving end of the circuit breaker, thereby improving the transmission efficiency. This debugging method is economical and saves the tens or hundreds of thousands of yuan purchase cost of a characteristic instrument.

[0019] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A system for debugging the characteristics of a servo-driven integrated circuit breaker, characterized in that, include: A DC power supply is connected in series at the circuit breaker's inlet / outlet ports, and a parallel resistor is connected in parallel in the circuit; The servo drive's input port is connected to a connecting wire that is led out in parallel from the circuit breaker's inlet / outlet port; A rotary sensor, installed on the shaft end of the circuit breaker drive system, transmits voltage change signals to the input port of the servo driver. A DC power supply powers the rotary sensor. The servo motor is mounted on the circuit breaker and transmits driving force to the circuit breaker through the circuit breaker's drive system. The computer receives the voltage signal collected by the servo driver and displays the voltage change signal curve on the driver software.

2. The characteristic debugging system for servo-driven integrated circuit breakers according to claim 1, characterized in that, The parallel resistor has a resistance of 50-100KΩ.

3. The characteristic debugging system for servo-driven integrated circuit breakers according to claim 1, characterized in that, The rotary sensor is a sliding resistor structure.

4. The characteristic debugging system for servo-driven integrated circuit breakers according to claim 1, characterized in that, The DC power supply voltage is 2V, and the DC power supply voltage is 9V.

5. A characteristic debugging system for servo-driven integrated circuit breakers according to claim 4, characterized in that, When the circuit breaker opens, the voltage at the servo drive input port changes from 0V to 2V at the instant the circuit breaker opens. When the circuit breaker closes, the voltage at the servo drive input port changes from 2V to 0V at the instant the circuit breaker closes.

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