Intelligent auxiliary device for mechanical characteristics of circuit breaker based on voltage isolation measurement

Abstract

The invention relates to a circuit breaker mechanical characteristic intelligent auxiliary device based on voltage isolation measurement, which comprises a direct current voltage isolation measurement intelligent auxiliary module and a circuit breaker mechanical characteristic tester, the DC voltage isolation measurement intelligent auxiliary module is connected with the breaker mechanical characteristic tester through a host measurement system embedded in the breaker mechanical characteristic tester. The DC voltage isolation measurement intelligent auxiliary module comprises a voltage isolation measurement module, an intelligent control module, a man-machine interaction module, a signal output module and a control signal module. The host measuring system comprises a host module; the device has the advantages that the structure is simple, the state is conveniently and quickly detected, interactive warning is effectively carried out, and stability and signal waveforms are not affected.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit breakers, and in particular relates to an intelligent auxiliary device for mechanical characteristics of a circuit breaker based on voltage isolation measurement. Background Art

[0002] Circuit breakers are extremely important electrical equipment in the power system. Their operating status and health level are related to the safe and stable operation of the entire power grid. Once a failure occurs, it will bring serious consequences. The circuit breaker mechanical characteristics test is an important means to reflect the status information of the circuit breaker equipment and an important indicator to evaluate the performance of the circuit breaker operating mechanism and transmission mechanism. It is of great significance to prevent and discover circuit breaker failures. Relevant regulations stipulate that the reference period for mechanical characteristics test of 110kV (66) and above circuit breakers is three years. The country requires circuit breakers above 72.5kV that have not been operated for more than three years to be opened and closed to avoid circuit breaker accidents that may be caused by long-term static storage. The circuit breaker test wiring diagram and flow chart are as follows: Figure 1 and Figure 2 As shown; currently, before using the "internal trigger" method for testing, the control power supply of the circuit breaker under test must be disconnected. Statistics show that different voltage levels and different mechanisms (whether they are anti-slow opening mechanisms) require closing and opening operating power supplies. During the closing and opening operating power supply process, there is a phenomenon that after the operating power supply is closed and the energy storage is pressed, the operating power supply is omitted and the closing and opening test is performed. Using an instrument to close and open the circuit breaker with the operating power supply may affect or even damage the insulation of the closing and opening coils, and may also affect the DC control system of the substation, thereby affecting the stability of the circuit breaker equipment and the secondary relay protection device in the station; therefore, it is very necessary to provide a circuit breaker mechanical characteristic intelligent auxiliary device based on voltage isolation measurement, which has a simple structure, convenient and fast detection status, effective interactive warning, and does not affect stability and signal waveform. Summary of the invention

[0003] 1. Technical issues In view of the above-mentioned existing technical status, this application mainly addresses the following technical problems: 1. During the process of closing and opening the operating power supply, there is a phenomenon that after closing the operating power supply for energy storage and pressure testing, the operating power supply is omitted and the closing and opening test is carried out; 2. Using the instrument to open and close the circuit breaker with operating power may affect or even damage the insulation of the opening and closing coils, and may also affect the DC control system of the substation, thereby affecting the stability of the circuit breaker equipment and secondary relay protection devices in the station; 3. Since the DC operating voltage of the circuit breaker is relatively high (110V or 220V), directly introducing it into the measurement system for sampling will not only affect the measurement safety, but also the spike signal generated by the voltage switching will interfere with the normal operation of other digital circuits.

[0004] (II) Technical solution The purpose of the present invention is to overcome the shortcomings of the prior art and to provide an intelligent auxiliary device for mechanical characteristics of a circuit breaker based on voltage isolation measurement, which has a simple structure, convenient and quick detection of status, effective interactive warning, and does not affect stability and signal waveform.

[0005] The object of the present invention is achieved as follows: a circuit breaker mechanical characteristic intelligent auxiliary device based on voltage isolation measurement, which includes a DC voltage isolation measurement intelligent auxiliary module and a circuit breaker mechanical characteristic tester, the DC voltage isolation measurement intelligent auxiliary module is connected to the circuit breaker mechanical characteristic tester through a host measurement system embedded in the circuit breaker mechanical characteristic tester, the DC voltage isolation measurement intelligent auxiliary module includes a voltage isolation measurement module, an intelligent control module, a human-computer interaction module, a signal output module and a control signal module; the host measurement system includes a host module.

[0006] Furthermore, the human-computer interaction module is connected to the intelligent control module to realize the interactive alarm function; the intelligent control module is connected to the signal output module to realize the locking output function.

[0007] Further, the signal output module is connected to the secondary terminal of the circuit breaker, the signal output module is connected to the voltage isolation measurement module, the voltage isolation measurement module is connected to the control signal module, and the control signal module is connected to the host module.

[0008] Furthermore, the voltage isolation measurement module performs isolation sampling on the DC voltage signal, converts the analog signal into a digital signal, and then transmits it to the host measurement system via the signal isolator.

[0009] Furthermore, the voltage isolation measurement module includes a voltage attenuation module, a signal processing module, an analog-to-digital conversion circuit and a digital isolation circuit.

[0010] Furthermore, the voltage attenuation module is used to attenuate the high voltage signal of the circuit breaker operating voltage into a low voltage signal; the signal processing module is used to further filter out high-frequency interference signals in the signal processed by the voltage attenuation module, match the input impedance, and reduce the output impedance.

[0011] Furthermore, the analog-to-digital conversion circuit is used to convert the analog signal provided by the signal processing module into a digital signal; the digital isolation circuit transmits the digital signal output by the analog-to-digital conversion circuit to the host measurement system to complete the isolated measurement of the operating voltage.

[0012] (III) Beneficial effects 1. The present invention adds a DC voltage measurement module to the control line of the mechanical property tester, which can conveniently and quickly detect the operating power supply status of the circuit breaker and has strong compatibility with the modification of mechanical property testers from different manufacturers; 2. The present invention adopts a high-reliability voltage measurement module and an intelligent handling strategy. When the operating power supply is detected to be energized, it can effectively give interactive warnings to the on-site test personnel, and at the same time, lock the opening and closing operations of the mechanical property tester to prevent the test personnel from opening and closing the circuit breaker with the operating power supply; 3. The voltage measurement module of the present invention adopts a high-stability measurement module, which does not affect the stability of the circuit breaker operating power supply and the waveform of the opening and closing signal output by the circuit breaker mechanical characteristics tester. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the wiring diagram for testing the mechanical characteristics of the circuit breaker of the present invention.

[0014] Figure 2 This is a flow chart of the circuit breaker mechanical characteristic test of the present invention.

[0015] Figure 3 It is a structural block diagram of the present invention.

[0016] Figure 4 It is a schematic diagram of the structure of the isolation measurement module of the present invention. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with embodiments and / or drawings. Example

[0018] like Figure 1-4 As shown, an intelligent auxiliary device for mechanical characteristics of a circuit breaker based on voltage isolation measurement, an intelligent auxiliary device for mechanical characteristics of a circuit breaker based on voltage isolation measurement, comprising a DC voltage isolation measurement intelligent auxiliary module and a circuit breaker mechanical characteristics tester, wherein the DC voltage isolation measurement intelligent auxiliary module is connected to the circuit breaker mechanical characteristics tester via a host measurement system embedded in the circuit breaker mechanical characteristics tester, wherein the DC voltage isolation measurement intelligent auxiliary module comprises a voltage isolation measurement module, an intelligent control module, a human-computer interaction module, a signal output module and a control signal module; and the host measurement system comprises a host module.

[0019] The human-computer interaction module is connected to the intelligent control module to realize the interactive alarm function; the intelligent control module is connected to the signal output module to realize the locking output function.

[0020] The signal output module is connected to the secondary terminal of the circuit breaker, the signal output module is connected to the voltage isolation measurement module, the voltage isolation measurement module is connected to the control signal module, and the control signal module is connected to the host module.

[0021] In the present invention, the DC voltage isolation measurement intelligent auxiliary module comprises: an isolation measurement module, an intelligent control module, a human-computer interaction module, and a signal output module.

[0022] The specific operating principle is as follows: the device is connected in series to a dedicated control line connecting the tester host and the secondary section in the circuit breaker control cabinet. After the test instrument is turned on, the voltage isolation measurement module collects the secondary terminal voltage and converts the collected low-voltage analog signal into a digital signal. The digital isolation circuit transmits the digital signal output by the analog-to-digital conversion circuit to the device processing module, and the intelligent control module analyzes and generates an intelligent disposal strategy, locks the signal output module, and performs an interactive alarm in the human-computer interaction module to prevent the operation of the instrument to open and close the circuit breaker when the power supply is energized.

[0023] The present invention adopts a stable, efficient and reliable DC voltage isolation acquisition technology to measure the circuit breaker operating power supply, thereby realizing isolated sampling of DC voltage signals; the intelligent handling strategy of the present invention realizes reliable locking of instrument operation output and effective alarm to operators when the operating power supply is energized; the influence mechanism and preventive measures of the voltage isolation measurement module of the present invention on the waveform of the opening and closing signal output by the circuit breaker mechanical characteristics tester eliminate the possible waveform distortion influence on the opening and closing signal.

[0024] To sum up, the present invention is connected in series to the dedicated control line connecting the tester host and the secondary section in the circuit breaker control cabinet to detect the application of the circuit breaker operating power supply status, and is easy to transform the existing circuit breaker mechanical characteristics test device. There is a blank in the relevant field in China, so it is a first. After the present invention detects that the operating power is energized, it adopts an intelligent disposal strategy to effectively lock the control signal of the circuit breaker mechanical characteristics tester and alarm the on-site test personnel, avoiding the impact on the opening and closing coils and the secondary control system caused by using the instrument to open and close the circuit breaker when the operating power is energized, greatly improving the safety of on-site work and effectively ensuring the inherent safety of power grid equipment.

[0025] The present invention is an intelligent auxiliary device for mechanical characteristics of a circuit breaker based on voltage isolation measurement. During use, the present invention adopts a DC voltage isolation measurement intelligent auxiliary module to detect the operating power supply status of the circuit breaker in real time. When it is detected that the operating power supply is energized, an alarm is given to the operator, and the opening and closing operations of the mechanical characteristics tester are locked. The present invention is not only suitable for testing the mechanical characteristics of circuit breakers of various voltage levels and models, but can also be applied to low-voltage action tests of circuit breakers, and can realize intelligent disposal strategies, effectively perform human-computer interaction reminders, lock the opening and closing operations of the mechanical characteristics tester of the circuit breaker, etc., greatly improve the inherent safety of on-site work, eliminate the damage to the opening and closing coils and DC system abnormalities that may be caused by opening and closing the circuit breaker with energized operating power supply, ensure the safe and stable operation of power grid equipment and the DC control system in the station, and have significant economic and social benefits after promotion. The present invention has the advantages of simple structure, convenient and fast detection of status, effective interactive warning, and no influence on stability and signal waveform. Example

[0026] like Figure 1-4 As shown, an intelligent auxiliary device for mechanical characteristics of a circuit breaker based on voltage isolation measurement, an intelligent auxiliary device for mechanical characteristics of a circuit breaker based on voltage isolation measurement, comprising a DC voltage isolation measurement intelligent auxiliary module and a circuit breaker mechanical characteristics tester, wherein the DC voltage isolation measurement intelligent auxiliary module is connected to the circuit breaker mechanical characteristics tester via a host measurement system embedded in the circuit breaker mechanical characteristics tester, wherein the DC voltage isolation measurement intelligent auxiliary module comprises a voltage isolation measurement module, an intelligent control module, a human-computer interaction module, a signal output module and a control signal module; and the host measurement system comprises a host module.

[0027] The voltage isolation measurement module isolates and samples the DC voltage signal, converts the analog signal into a digital signal, and then transmits it to the host measurement system through the signal isolator.

[0028] The voltage isolation measurement module includes a voltage attenuation module, a signal processing module, an analog-to-digital conversion circuit and a digital isolation circuit.

[0029] The voltage attenuation module is used to attenuate the high voltage signal of the circuit breaker operating voltage into a low voltage signal; the signal processing module is used to further filter out the high-frequency interference signal in the signal processed by the voltage attenuation module, match the input impedance, and reduce the output impedance.

[0030] The analog-to-digital conversion circuit is used to convert the analog signal given by the signal processing module into a digital signal; the digital isolation circuit transmits the digital signal output by the analog-to-digital conversion circuit to the host measurement system to complete the isolated measurement of the operating voltage.

[0031] In the present invention, the isolated sampling measurement module is composed of four modules: voltage attenuation, signal processing, analog-to-digital conversion and digital isolation. The circuit block diagram of the measurement module is as follows: Figure 4 As shown; after the circuit breaker operating voltage passes through the voltage attenuation module, the high voltage signal is attenuated into a low voltage signal, and the low voltage signal enters the signal processing module; the signal processing module further filters out high-frequency interference signals, matches the input impedance, and reduces the output impedance; the analog-to-digital conversion circuit converts the analog signal given by the signal processing module into a digital signal: the digital isolation circuit transmits the digital signal output by the analog-to-digital conversion circuit to the measurement system to complete the isolated measurement of the operating voltage.

[0032] At present, there are two main methods for checking the operating power status of circuit breakers. One is that the test personnel go to the protection room to confirm the operating power status, which wastes manpower and time; the other is to use a multimeter for on-site measurement, which increases the complexity of on-site work. The present invention adopts DC voltage isolation measurement technology to effectively detect the on-site operating power status, which has the characteristics of automation and high safety and is extremely innovative. The present invention adopts an intelligent processing strategy. When the DC voltage isolation measurement intelligent auxiliary device determines that the operating power is energized, an intelligent disposal strategy is immediately adopted to promptly remind the test personnel and lock the instrument operating circuit, effectively avoiding the use of the instrument to open and close the circuit breaker when the operating power is energized.

[0033] In summary, the present invention can accurately detect the operating power supply status of the circuit breaker, and adopt an intelligent handling strategy to effectively realize human-computer interaction reminders and lock the opening and closing operations of the circuit breaker mechanical characteristic tester; the present invention solves the possible existence of omitting to disconnect the operating power supply and using the mechanical characteristic tester to open and close the circuit breaker on site, which may cause damage to the insulation of the opening and closing coils, and the possible impact on the DC control system of the substation, and adopts an intelligent handling strategy to improve the inherent safety of on-site work and ensure the safe and stable operation of the power grid.

[0034] The present invention is an intelligent auxiliary device for mechanical characteristics of a circuit breaker based on voltage isolation measurement. In use, the present invention combines a DC voltage isolation measurement intelligent auxiliary module with a circuit breaker mechanical characteristics tester, can detect the operating power supply state of the circuit breaker, and can effectively give an alarm and lock output for the test; the present invention is not only suitable for testing the mechanical characteristics of circuit breakers of various voltage levels and models, but can also be applied to low-voltage action tests of circuit breakers, can realize intelligent disposal strategies, effectively perform human-machine interactive reminders, lock the opening and closing operations of the circuit breaker mechanical characteristics tester, etc., greatly improve the inherent safety of on-site work, eliminate the damage to the opening and closing coils and DC system abnormalities that may be caused by operating the power supply to open and close the circuit breaker, ensure the safe and stable operation of power grid equipment and the DC control system in the station, and have significant economic and social benefits after promotion; the present invention has the advantages of simple structure, convenient and fast detection of status, effective interactive warning, and no influence on stability and signal waveform.

Claims

1. An intelligent auxiliary device for mechanical characteristics of a circuit breaker based on voltage isolation measurement, comprising a DC voltage isolation measurement intelligent auxiliary module and a circuit breaker mechanical characteristics tester, characterized in that: The DC voltage isolation measurement intelligent auxiliary module is connected to the circuit breaker mechanical characteristics tester through a host measurement system embedded in the circuit breaker mechanical characteristics tester. The DC voltage isolation measurement intelligent auxiliary module includes a voltage isolation measurement module, an intelligent control module, a human-computer interaction module, a signal output module and a control signal module; the host measurement system includes a host module.

2. The circuit breaker mechanical characteristic intelligent auxiliary device based on voltage isolation measurement according to claim 1, characterized in that: The human-computer interaction module is connected to the intelligent control module to realize the interactive alarm function; the intelligent control module is connected to the signal output module to realize the locking output function.

3. The circuit breaker mechanical characteristic intelligent auxiliary device based on voltage isolation measurement according to claim 2, characterized in that: The signal output module is connected to the secondary terminal of the circuit breaker, the signal output module is connected to the voltage isolation measurement module, the voltage isolation measurement module is connected to the control signal module, and the control signal module is connected to the host module.

4. The circuit breaker mechanical characteristic intelligent auxiliary device based on voltage isolation measurement according to claim 3, characterized in that: The voltage isolation measurement module isolates and samples the DC voltage signal, converts the analog signal into a digital signal, and then transmits it to the host measurement system through the signal isolator.

5. The circuit breaker mechanical characteristic intelligent auxiliary device based on voltage isolation measurement according to claim 4, characterized in that: The voltage isolation measurement module includes a voltage attenuation module, a signal processing module, an analog-to-digital conversion circuit and a digital isolation circuit.

6. The circuit breaker mechanical characteristic intelligent auxiliary device based on voltage isolation measurement according to claim 5, characterized in that: The voltage attenuation module is used to attenuate the high voltage signal of the circuit breaker operating voltage into a low voltage signal; the signal processing module is used to further filter out the high-frequency interference signal in the signal processed by the voltage attenuation module, match the input impedance, and reduce the output impedance.

7. The circuit breaker mechanical characteristic intelligent auxiliary device based on voltage isolation measurement according to claim 5, characterized in that: The analog-to-digital conversion circuit is used to convert the analog signal given by the signal processing module into a digital signal; the digital isolation circuit transmits the digital signal output by the analog-to-digital conversion circuit to the host measurement system to complete the isolated measurement of the operating voltage.

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