CN110553830A - online detection method for mechanical characteristics of metal-enclosed switchgear - Google Patents

Abstract

The invention discloses an online detection method for the mechanical characteristics of metal-enclosed switchgear, which comprises the following steps: S1, collecting vibration signals when the switch cabinet operates, and collecting current data of the opening and closing coils when the circuit breaker operates; S2, collecting the vibration signals Send the signal and current data to the processing terminal; S3, extract the key current and time information and the time information of the vibration event change; S4, display the key current and time information in the form of waveform, and display the time information of the vibration event change in the form of waveform Display; S5. Judging whether the key current and the vibration event occur at the same time, if so, it is determined that the switch is operated at this time, otherwise it is judged that the switch is not operated at this time. The present invention adopts multi-sensors to perceive its mechanical characteristics, and can compare the signals sensed by the two to avoid errors caused by a single detection.

Description

A method for online detection of mechanical characteristics of metal-enclosed switchgear

technical field

The invention relates to the detection field of metal-enclosed switchgear, in particular to an online detection method for mechanical characteristics of metal-enclosed switchgear.

Background technique

High-voltage circuit breakers are the most important protection and control equipment in power systems, and the reliability of their performance is closely related to the reliability of their mechanical transmission systems. The mechanical characteristic test of the circuit breaker is not only an important item in the routine test, but also an indispensable content for the non-stop testing of the switchgear. The mechanical state evaluation based on the test results is an important guarantee for the reliable operation of the circuit breaker and the safety and stability of the power grid. , and the 10kV metal-enclosed switchgear is the last level of high-voltage switchgear facing the user side, and the operating status of the internal circuit breaker directly affects the user's electricity consumption, so it is more important.

At present, in the detection of the mechanical characteristics of the circuit breaker in the 10kV metal-enclosed switchgear, it is mainly carried out by the detection personnel carrying the mechanical characteristic detector in the switch cabinet for routine power outage maintenance. Although this detection method is currently used more Common, but there are many problems.

(1) The testing personnel must carry the detector to the scene for testing, and the testing process is cumbersome;

(2) Since the detection is generally carried out during routine maintenance and the number of times is small, it is not possible to provide more samples to infer the mechanical characteristics of the switchgear during actual operation;

(3) The detection method is relatively simple, and can only be inferred by detecting the current of the opening and closing coil.

Contents of the invention

In view of the above-mentioned shortcomings in the prior art, the online detection method of the mechanical characteristics of the metal-enclosed switchgear provided by the present invention solves the problem of cumbersome and inconvenient detection methods of the existing metal-enclosed switchgear.

In order to achieve the above-mentioned purpose of the invention, the technical scheme adopted in the present invention is:

A method for online detection of mechanical characteristics of metal-enclosed switchgear is provided, which includes the following steps:

S1. Collect the vibration signal when the switch cabinet is in motion, and collect the current data of the opening and closing coil when the circuit breaker is in motion;

S2. Send the collected vibration signal and current data to the processing terminal;

S3. Perform wavelet denoising on the current data through the processing terminal to extract key current and time information; perform wavelet denoising and envelope analysis on the vibration signal through the processing terminal to extract time information of vibration event changes;

S4. Display the key current and time information in the form of waveforms, and display the time information of vibration event changes in the form of waveforms;

S5. Determine whether the key current and the vibration event occur at the same time. If so, determine that the switch has been operated at this time; otherwise, determine that the switch has not been operated at this time.

Further, the specific method of step S1 is:

Vibration sensors are used to collect vibration signals when the switchgear is in motion, and Hall sensors are used to collect the current of the opening and closing coils when the circuit breaker is in motion to obtain vibration signals and current data.

Further, the specific method of step S2 is:

The collected vibration signal and current data are collected and converted through the A/D data acquisition card, and the converted signal is sent to the processing terminal through the wireless communication module.

Further, the wireless communication module is a Zigbee communication module.

Further, the processing terminal is an industrial computer.

The beneficial effect of the present invention is that: the method adopts multi-sensors to sense the mechanical characteristics, and the signals sensed by the two can be compared, thereby avoiding errors caused by a single detection. The various detection equipment used in this method can continue to run after only one installation, and the maintenance personnel only need to look at the on-site processing terminal to obtain the mechanical characteristics of the switchgear during each movement within the required time, and the operation is simple and convenient . The method can realize the real-time and continuous detection of the mechanical characteristics of the 10kV metal-enclosed switchgear, and avoids the problem that the actual mechanical characteristics cannot be grasped because the detection is performed only when the power is cut off for maintenance.

Description of drawings

Fig. 1 is a schematic flow chart of the present invention.

Detailed ways

The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

As shown in Figure 1, the online detection method for the mechanical characteristics of the metal-enclosed switchgear includes the following steps:

S1. Collect the vibration signal when the switch cabinet is in motion, and collect the current data of the opening and closing coil when the circuit breaker is in motion;

S2. Send the collected vibration signal and current data to the processing terminal;

S3. Perform wavelet denoising on the current data through the processing terminal to extract key current and time information; perform wavelet denoising and envelope analysis on the vibration signal through the processing terminal to extract time information of vibration event changes;

S4. Display the key current and time information in the form of waveforms, and display the time information of vibration event changes in the form of waveforms;

S5. Determine whether the key current and the vibration event occur at the same time. If so, determine that the switch has been operated at this time; otherwise, determine that the switch has not been operated at this time.

The specific method of step S1 is as follows: collect the vibration signal when the switch cabinet operates through the vibration sensor, and use the Hall sensor to collect the opening and closing coil current when the circuit breaker operates to obtain the vibration signal and current data.

The specific method of step S2 is: collect and convert the collected vibration signal and current data through the A/D data acquisition card, and send the converted signal to the processing terminal through the wireless communication module. The wireless communication module is a Zigbee communication module. The processing terminal is an industrial computer.

In one embodiment of the present invention, the vibration sensor can be used to collect the vibration signal when the switch cabinet is in motion, the Hall sensor can be used to collect the opening and closing coil current when the circuit breaker is in motion, and the A/D data acquisition card can be used to collect The sensor data is collected, and the wireless communication module based on Zigbee is used to establish a wireless network between each collection unit and the field data processing terminal. The data is sent from the acquisition unit to the on-site data processing terminal. The on-site data processing terminal is implemented by an industrial computer, equipped with data processing software, which can perform operations such as wavelet changes on the collected data, and can perform waveform diagrams of its mechanical characteristics based on the collected data. of drawing, storage, etc.

To sum up, the present invention adopts multi-sensors to perceive its mechanical characteristics, and the signals sensed by the two can be compared to avoid errors caused by a single detection. The various detection equipment used in this method can continue to run after only one installation, and the maintenance personnel only need to look at the on-site processing terminal to obtain the mechanical characteristics of the switchgear during each movement within the required time, and the operation is simple and convenient . The method can realize the real-time and continuous detection of the mechanical characteristics of the 10kV metal-enclosed switchgear, and avoids the problem that the actual mechanical characteristics cannot be grasped because the detection is performed only when the power is cut off for maintenance.

Claims (5)

1. A metal-enclosed switchgear mechanical characteristic online detection method, is characterized in that, comprises the following steps: S1. Collect the vibration signal when the switch cabinet is in motion, and collect the current data of the opening and closing coil when the circuit breaker is in motion; S2. Send the collected vibration signal and current data to the processing terminal; S3. Perform wavelet denoising on the current data through the processing terminal to extract key current and time information; perform wavelet denoising and envelope analysis on the vibration signal through the processing terminal to extract time information of vibration event changes; S4. Display the key current and time information in the form of waveforms, and display the time information of vibration event changes in the form of waveforms; S5. Determine whether the key current and the vibration event occur at the same time. If so, determine that the switch has been operated at this time; otherwise, determine that the switch has not been operated at this time. 2. The online detection method for mechanical characteristics of metal-enclosed switchgear according to claim 1, characterized in that, the specific method of the step S1 is: Vibration sensors are used to collect vibration signals when the switchgear is in motion, and Hall sensors are used to collect the current of the opening and closing coils when the circuit breaker is in motion to obtain vibration signals and current data. 3. The online detection method for mechanical characteristics of metal-enclosed switchgear according to claim 1, characterized in that, the specific method of the step S2 is: The collected vibration signal and current data are collected and converted through the A/D data acquisition card, and the converted signal is sent to the processing terminal through the wireless communication module. 4. The online detection method for mechanical characteristics of metal-enclosed switchgear according to claim 3, wherein the wireless communication module is a Zigbee communication module. 5. The online detection method for mechanical characteristics of metal-enclosed switchgear according to claim 1, wherein the processing terminal is an industrial computer.