Wireless intelligent verification system for density relay

Abstract

The invention discloses a wireless intelligent verification system for a density relay, and the system comprises a data collection module which is used for collecting the related data of the density relay; the host module is used for processing and displaying the acquired data; compared with the prior art, transmission is carried out through a wireless communication means, collected signals and transmitted signals are processed and compensated at the same time, so that the signals are more stable and accurate, meanwhile, the shape and the material of an antenna are optimized, and the antenna quality is improved. Therefore, the antenna adapts to different wireless communication standards and frequency ranges.

Description

Technical Field

[0001] The invention relates to a wireless intelligent verification system for a density relay, in particular to a wireless data verification device for an SF6 density relay for monitoring the pressure of a GIS gas chamber or other SF6 gas equipment in a transformer substation. Background Art

[0002] The SF6 density relay for substation GIS gas chamber pressure monitoring is an insulating gas pressure monitoring meter for high-voltage equipment operation. During the on-site detection of SF6 density relays in substations, some relays are installed at a high position, which makes it impossible to directly connect the calibrator using traditional wired connection. The calibrator itself is large in size and heavy in weight, which brings great inconvenience to high-altitude operations. In addition, there are a large number of SF6 density relays in high-voltage GIS equipment. Verification through traditional wired methods requires a lot of power outage time due to the complicated wiring process. Summary of the invention

[0003] The purpose of the present invention is to provide an instrument for data verification of SF6 density relays, which simplifies the difficulty of high-altitude operations through a split form and greatly reduces the time required for maintenance.

[0004] The present invention is achieved by the following technical means: A density relay wireless intelligent calibration system, comprising: Data acquisition module, used to collect relevant data of density relay; Host module, used for processing and displaying the collected data; The data acquisition module and the host module are connected via a wireless communication module. A dynamic voltage division adjustment circuit is arranged on the data acquisition module to make the collected data more stable.

[0005] The wireless communication module is a 5G communication module, which includes a wireless data sending module arranged in the data acquisition module and a wireless data receiving module arranged in the host module, and a signal strength verification device is arranged on the wireless data sending module.

[0006] The signal strength verification device detects the signal strength and frequency band number of the communication module. If the signal strength is weak, the output power of the communication module is increased. If the working frequency band has large interference, it switches to other frequency bands or other frequency points of the frequency band for signal output.

[0007] The weak signal strength includes: The reference signal receiving power is continuously lower than -110dBm; The reference signal receiving power changes continuously for more than three times within a short period of time between -90 dBm and 110 dBm.

[0008] The operating bands include sub-6GHz band and millimeter wave band.

[0009] The data acquisition module also integrates a temperature sensor, a calibration circuit and a compensation circuit, and data connection is achieved between them. The temperature sensor is responsible for obtaining the ambient temperature, and the calibration circuit calibrates the output voltage of the data acquisition module according to the ambient temperature and built-in parameters. When the ambient temperature is lower than 10 degrees Celsius or higher than 50 degrees Celsius, the compensation circuit starts and compensates the output voltage accordingly.

[0010] The host module is composed of a signal processing module, an MCU processor and a data display module, wherein the signal processing module adopts a series resistor matrix circuit form, the matrix is ​​an M*N structure, each row contains M series resistors, and N columns of resistor strings are interconnected through switches or other control elements, and M and N are both constants not less than 5.

[0011] The wireless data sending and receiving modules are both equipped with LC filtering circuits, and the LC filtering respectively filters the data obtained from the density relay and the data received by the data receiving module.

[0012] The wireless data transmission and reception modules are both equipped with an antenna, which is spiral in shape and has a butterfly-shaped outer petal on the top. The surface of the antenna is sprayed with a nano-scale silver particle coating to ensure that the antenna impedance is 50 ohms.

[0013] Compared with the prior art, the present invention transmits through wireless communication means, and processes and compensates the collected signals and the transmitted signals to make the signals more stable and accurate. At the same time, the shape and material of the antenna are optimized to adapt to different wireless communication standards and frequency ranges. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of a dynamic voltage division adjustment circuit of the present invention; Figure 3 This is a schematic diagram of the LC filter circuit. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings: The present invention relates to a wireless intelligent calibration system for a density relay, comprising: Data acquisition module, used to collect relevant data of density relay; Host module, used for processing and displaying the collected data; The data acquisition module and the host module are connected via a wireless communication module. A dynamic voltage division adjustment circuit is arranged on the data acquisition module to make the collected data more stable.

[0016] Specifically, the whole set of calibration instrument includes: 2-1 data acquisition module, 2-2 wireless data transmission module, 1-1 wireless data receiving module, 1-2 signal processing module, 1-3 MCU processor, 1-4 data display module.

[0017] When the system is actually running, the 2 data wireless acquisition module is connected to the 3 SF6 density relays in the air, and the 2-1 data acquisition module collects the contact signals of the 3 SF6 density relays. The collected signals are sent through the 2-2 wireless data sending module and received by the 1-1 wireless data receiving module of the 1 SF6 density relay calibrator host. The received signals will be processed by the 1-2 signal processing module to extract valid signal data, and then these data will be sent to the 1-3 MCU processor for further processing. Finally, the processed data will be displayed to the user through the 1-4 data display module.

[0018] The wireless communication module is a 5G communication module, which includes a wireless data sending module arranged in the data acquisition module and a wireless data receiving module arranged in the host module, and a signal strength verification device is arranged on the wireless data sending module.

[0019] The dynamic voltage-dividing circuit of the present invention comprises a microcontroller U1, resistors R1-R10, capacitors C1-C9 and an inductor L1. The VIN pin of U1 is connected to the input end after filtering through C5 and C6, the EN pin is connected to the VIN pin through R2, C7 is connected to the GND pin, and the SW pin is divided into two circuits, one of which is connected in series with C1 and R3 between the BST pin, and the other is connected in series with L1 and connected in parallel with C2, C3 and C4 to the output end; the PWM input end is connected to two circuits, one of which is connected to a 3.3V DC power supply through R6, and the other is connected in parallel with C9 after voltage division through R7 and R9, and then connected in series with R8, R1, R5 and R10 from the output through R4 input feedback FB pin, and C8 is connected in parallel with R5. The dynamic voltage-dividing adjustment circuit adopts a feedback control method to achieve real-time adaptation to different loads. The circuit monitors the output voltage and load current changes in real time through a sensor or a detection circuit, and feeds back to the control circuit.

[0020] Pin 6 of U1 is the voltage feedback pin, and the peripheral circuits R1, R5 and R10 form a voltage division feedback path. According to the real-time monitoring of the voltage of pin 6, the PWM parameters are adjusted to achieve the process of dynamically adjusting the voltage. The control circuit will calculate the appropriate voltage division ratio according to the feedback signal, and adjust the voltage division ratio by adjusting the connection method of the resistor or the parameters of the control element. The dynamic voltage division adjustment circuit uses R1, R5 and R10 to form voltage feedback, and realizes dynamic voltage adjustment by adjusting the PWM duty cycle. When the load increases, the feedback voltage increases, the PWM duty cycle decreases, and the output voltage decreases accordingly; when the load decreases, the feedback voltage decreases, the PWM duty cycle increases, and the output voltage increases. To change the voltage division ratio, so that the output voltage remains stable. When the load current increases, the circuit will automatically reduce the voltage division ratio so that the output voltage will not decrease due to the increase of the load current; when the load current decreases, the circuit will automatically increase the voltage division ratio so that the output voltage will not increase due to the decrease of the load current.

[0021] Using microprocessors or analog circuits as control circuits, different control strategies can be implemented by programming or adjusting circuit parameters. At the same time, high-precision sensors are used to monitor the changes in output voltage and load current in real time, thereby improving control accuracy and response speed.

[0022] The signal strength verification device detects the signal strength and frequency band number of the communication module. If the signal strength is weak, the output power of the communication module is increased. If the working frequency band has large interference, it switches to other frequency bands or other frequency points of the frequency band for signal output.

[0023] The weak signal strength includes: The reference signal receiving power is continuously lower than -110dBm; The reference signal receiving power changes continuously for more than three times within a short period of time between -90 dBm and 110 dBm.

[0024] The operating bands include sub-6GHz band and millimeter wave band.

[0025] The data acquisition module also includes a temperature sensor, a calibration circuit and a compensation circuit, and the three are connected in data. The temperature sensor is responsible for obtaining the ambient temperature, and the calibration circuit receives this temperature information and calibrates the output voltage of the data acquisition module according to the built-in parameters. When the ambient temperature is lower than 10 degrees Celsius or higher than 50 degrees Celsius, the compensation circuit starts and compensates the output voltage accordingly.

[0026] Specifically, when the device is turned on, the calibration circuit will automatically run. It will first check whether there are any changes in component parameters since the last calibration (such as changes in resistance due to temperature changes). The calibration circuit will obtain the current temperature information and combine it with the known temperature-component parameter change curve to determine whether recalibration is required. If it is determined that calibration is required, a quick calibration is performed using the internal calibration source. When the environmental factors (such as temperature, humidity and electromagnetic interference) in which the circuit is located change significantly, and these changes may have an adverse effect on the performance of the circuit, the calibration circuit will start to intervene. After completing the calibration operation and confirming that the output voltage has reached the predetermined accuracy range, the calibration circuit will automatically exit. When the device enters a low-power mode (such as sleep mode or standby mode), the calibration circuit will usually exit in order to reduce power consumption.

[0027] The host module includes a signal processing module, an MCU processor and a data display module. The signal processing module is a series resistor matrix circuit. The series resistor matrix is ​​an M*N matrix. M resistors in each row are connected in series, and the N columns of resistor strings are connected by switches or other control elements. M and N are both constants and not less than 5.

[0028] In actual applications, there may be a difference between the nominal value and the actual value of the resistor. Especially in circuits with extremely high precision requirements, this difference may cause the voltage division or current limiting effect to be inconsistent with the design expectations. For example: the resistance value of the resistor will change with temperature, especially in an environment with large temperature changes. This may change the voltage division and current limiting characteristics of the resistor matrix. Or after long-term use, the resistor may age and its resistance value may change. This will gradually affect the performance of the circuit and reduce the effect of signal adjustment and optimization.

[0029] Therefore, the present invention uses precision metal film resistors or wire-wound resistors, and at the same time, screens and pairs the resistors, measures the actual resistance values ​​of multiple resistors, and selects resistors that are closest to the design values ​​and match each other to form a resistor matrix.

[0030] In addition, a thermistor with a negative temperature coefficient (NTC) or a positive temperature coefficient (PTC) is added to the resistor matrix. When the temperature rises, the resistance of the NTC thermistor decreases, while the resistance of the PTC thermistor increases. These two thermistors can form a complementary effect with ordinary resistors. Alternatively, a temperature compensation circuit can be used to detect temperature changes through a temperature sensor, and then the compensation circuit can be used to adjust the equivalent resistance of the resistor matrix.

[0031] The output end of the wireless data receiving module is configured with an LC filter circuit. The received data will first be filtered by the circuit and then sent to the host module for subsequent processing. In the present invention, an LC filter circuit is also set on the wireless data transmitting module. The data obtained from the SF6 density relay is first filtered by the LC filter circuit and then sent to the wireless data sending module for transmission. The dual LC filter circuit can remove the interference generated in data acquisition and transmission to the greatest extent, thereby ensuring the accuracy of the data.

[0032] An antenna is arranged on the wireless data transmission module and the wireless data receiving module. The antenna is spiral-shaped, and a butterfly-shaped outer petal is arranged on the top of the spiral antenna. The surface of the antenna is sprayed with a nano-level silver particle coating, and the antenna impedance is 50 ohms.

[0033] In addition, the shape of the antenna helix can be in the form of an equiangular spiral, and the butterfly outer lobe adopts a multi-layer patch structure. The patch sizes and shapes of different layers correspond to different frequency bands. The bottom patch can be designed to be larger in size to cover the lower frequency band in the Sub-6GHz band, and the upper patch size is smaller to cover the higher frequency band or millimeter wave band in the Sub-6GHz band. The patches on each layer are connected by a suitable medium and feeding method, so that the antenna can work effectively in multiple frequency bands. The butterfly outer lobe and the spiral antenna are bonded by a bonding method. At the same time, advanced technologies such as slotting and adding short-circuit pins can be used on the patch to further fine-tune the resonant frequency and bandwidth of the antenna to ensure that they can meet the strict requirements of different wireless communication standards for frequency range and bandwidth, thereby optimizing the radiation efficiency and directivity design of the antenna. Designed as a multi-band antenna to adapt to different wireless communication standards and frequency ranges.

[0034] In the present invention, the antenna can dynamically adjust the outer lobe direction of the antenna according to the direction of the received signal so that it is always aimed at the signal source. The adaptive antenna can automatically adjust the outer lobe level according to the interference situation of the surrounding environment to suppress the interference signal. The adaptive antenna can automatically adjust the polarization mode of the antenna according to the polarization characteristics of the signal to achieve the best signal reception effect. The adaptive antenna continuously monitors the polarization state of the signal and accurately adjusts its polarization parameters to ensure that the polarization match between the antenna and the signal is optimal, thereby significantly improving the signal reception effect and stability.

[0035] In the present invention, a metal shielding cover is arranged outside the antenna to shield the antenna. The shielding cover has excellent reflection and absorption capabilities, can effectively resist external electromagnetic interference, create a relatively independent electromagnetic environment for the antenna, and enable the antenna to work stably in this safe space, thereby greatly reducing the adverse effects of external interference on the antenna receiving and transmitting signals. At the operating frequency of the antenna, the shielding cover will be designed with appropriate openings and gaps so that the antenna signal can effectively penetrate the shielding layer for transmission and reception.

Claims

1. A density relay wireless intelligent calibration system, characterized in that: include: Data acquisition module, used to collect relevant data of density relay; Host module, used for processing and displaying the collected data; The data acquisition module and the host module are connected via a wireless communication module. A dynamic voltage division adjustment circuit is provided on the data acquisition module to improve the stability of the acquired data.

2. A density relay wireless intelligent calibration system according to claim 1, characterized in that: The dynamic voltage division adjustment circuit is composed of a microprocessor, a switching element and a plurality of resistors, wherein the microcontroller can generate a corresponding digital control signal according to a preset algorithm or an external control signal, and the resistors form a resistor network to achieve different voltage division ratios, thereby realizing dynamic adjustment of the voltage division ratio.

3. A density relay wireless intelligent calibration system according to claim 1, characterized in that: The wireless communication module is a 5G communication module, which includes a wireless data sending module arranged in the data acquisition module and a wireless data receiving module arranged in the host module, and a signal strength verification device is arranged on the wireless data sending module.

4. A density relay wireless intelligent calibration system according to claim 3, characterized in that: The signal strength verification device detects the signal strength and frequency band number of the communication module. If the signal strength is weak, the output power of the communication module is increased. If the working frequency band has large interference, it switches to other frequency bands or other frequency points of the frequency band for signal output.

5. A density relay wireless intelligent calibration system according to claim 4, characterized in that: The weak signal strength includes: The reference signal receiving power is continuously lower than -110dBm; The reference signal receiving power changes continuously for more than three times within a short period of time between -90 dBm and 110 dBm.

6. A density relay wireless intelligent calibration system according to claim 4, characterized in that: The operating band of the device covers the sub-6GHz band and the millimeter wave band, achieving higher spectrum efficiency and lower latency and ultra-high reliability and low latency requirements.

7. A density relay wireless intelligent calibration system according to claim 1, characterized in that: The data acquisition module also includes a temperature sensor, a calibration circuit and a compensation circuit. The temperature sensor is data-connected with the calibration circuit and the compensation circuit. The temperature sensor is responsible for obtaining the ambient temperature. The calibration circuit receives the temperature information and calibrates the output voltage of the data acquisition module according to the built-in parameters. When the ambient temperature is lower than 10 degrees Celsius or higher than 50 degrees Celsius, the compensation circuit will automatically start and compensate the output voltage accordingly.

8. A density relay wireless intelligent calibration system according to claim 1, characterized in that: The host module includes a signal processing module, an MCU processor and a data display module. The signal processing module is a series resistor matrix circuit. The series resistor matrix is ​​an M*N structure, wherein each row contains M resistors connected in series, and N columns of resistor strings are connected to each other through switches or other control elements. Both M and N are constants not less than 5.

9. A density relay wireless intelligent calibration system according to claim 3, characterized in that: The wireless data sending and receiving modules are both equipped with LC filtering circuits, and the LC filtering respectively filters the data obtained from the density relay and the data received by the data receiving module.

10. A density relay wireless intelligent calibration system according to claim 3, characterized in that: The wireless data transmission module and receiving module are both equipped with antennas. The antennas are spiral in shape with butterfly-shaped outer petals on the top. Nano-scale silver particle coating is applied to the antenna surface, and the antenna impedance is set to 50 ohms.

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