Dielectric loss calibration device
Through the dielectric loss calibration device of series resistors and relays, accurate dielectric loss measurement in the range of 0.001-1000 Hz is achieved, which solves the problem of insufficient accuracy of frequency domain dielectric spectrum testing and improves test accuracy and portability.
Patent Information
- Application Number
- CN202422239811.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-09-12
AI Technical Summary
In the existing technology, the test data of the frequency domain dielectric spectrum in the low-frequency and high-frequency bands are different from the actual test values. The lack of standard test samples and calibration devices leads to insufficient test accuracy.
A dielectric loss calibration device was designed. By connecting resistors and relays of different resistance values in series, combined with a microcontroller and a touch screen, the dielectric loss value was automatically calculated, achieving accurate calibration in the range of 0.001-1000 Hz.
It improves the test precision and accuracy of dielectric loss measurement, solves the problem of lack of standard test pieces for wide-frequency domain dielectric loss meters, and enhances the reliability and portability of on-site testing.
Smart Images
Figure CN223308364U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electrical test equipment, in particular to a dielectric loss calibration device. Background Art
[0002] Frequency-domain dielectric spectroscopy is a method for testing dielectric properties in electrical testing. It reveals the electrical properties of a material by measuring its dielectric constant and dielectric loss factor at different frequencies. Frequency-domain dielectric spectroscopy typically covers frequencies from millihertz to tens of kilohertz. Test data at low and high frequencies often differ from actual test values. Therefore, a dielectric loss calibration device is used as a test piece to measure the test data from the dielectric loss meter to improve test accuracy.
[0003] Therefore, in order to solve the calibration problem of the above-mentioned test device for measuring the dielectric constant and dielectric loss factor of dielectric materials at different frequencies, a calibration device for the dielectric loss measuring device is needed. Utility Model Content
[0004] The present invention aims to provide a dielectric loss calibration device. This device uses a series connection of resistors and capacitors to simulate dielectric loss. By using a fixed 50-100pF standard vacuum capacitor, dielectric loss is close to zero. Under an AC sinusoidal voltage, the ratio of the active component of the resistor to the reactive component of the capacitor is the dielectric loss. At lower frequencies, the capacitive reactance increases while the resistance remains constant. Dielectric loss decreases proportionally with decreasing frequency. To improve test accuracy, it is necessary to increase the resistance and increase the resolution of dielectric loss. Therefore, this device utilizes resistors of different values, R1-R7, and controls relays connected in series with R1-R7 via a touchscreen display to select resistors of different values for testing and calibration. A different resistor is selected via an LCD screen, and a microprocessor controls the corresponding relay to connect to the different resistors. The LCD screen displays the capacitance, resistance, and dielectric loss values at different frequencies. Based on the selected resistor, the microcontroller automatically calculates the dielectric loss value within a wide frequency range of 0.001-1000 Hz. This device meets the requirements for calibrating different resistance values to the greatest extent possible, improves calibration test accuracy, and is simple, convenient, and quick to operate, with strong practicality.
[0005] The utility model is implemented as follows: the utility model includes a vacuum capacitor, a calibration resistor selection device connected to the vacuum capacitor, and a touch screen connected to the calibration resistor selection device;
[0006] wherein the calibration resistance selection device comprises at least one resistor and a relay connected in series, or a relay, wherein the resistor and the relay are connected in series or the relay is connected to the vacuum capacitor;
[0007] The calibration resistor selection device is specifically a calibration resistor selection device in which a relay is connected to the touch screen, and the touch screen is provided with a micro-control processing unit, which is connected to the relay through the micro-control processing unit.
[0008] The vacuum capacitor includes a vacuum insulation tank and a vacuum capacitor top cover mounted on the vacuum insulation tank. A terminal is provided through the vacuum capacitor top cover. The terminal extends into the vacuum insulation tank and is connected to a first capacitor plate. A second capacitor plate is provided on an outer side of the first capacitor plate. A vacuum chamber is formed between the first capacitor plate and the second capacitor plate.
[0009] A shielding cover is provided at the outer end of the second capacitor plate, and the shielding cover passes through the vacuum insulation tank and is connected to a hollow sealing cover.
[0010] Furthermore, the calibration resistance selection device is arranged in the sealing cover, and the resistors include R1, R2, R3, R4, R5, R6, and R7, and the resistors R1, R2, R3, R4, R5, R6, and R7 are respectively connected in series with relays 1, relay 2, relay 3, relay 4, relay 5, relay 6, and relay 7 in a one-to-one correspondence;
[0011] The resistors R1, R2, R3, R4, R5, R6, and R7 are respectively connected in series with relays 1, 2, 3, 4, 5, 6, and 7, and are specifically connected to the second capacitor plate in the vacuum capacitor. A relay 8 is also provided in the sealing cover, and the relay 8 is connected to the second capacitor plate in the vacuum capacitor.
[0012] The relays are connected to the touch screen, specifically relay 1, relay 2, relay 3, relay 4, relay 5, relay 6, and relay 7. Relay 8 is connected to the microcontroller processing unit. The resistors R1 = 10GΩ, R2 = 1GΩ, R3 = 100MΩ, R4 = 10MΩ, R5 = 1MΩ, R6 = 100kΩ, and R7 = 10kΩ. The capacitance of the vacuum capacitor is 50-100pF.
[0013] Furthermore, the relay 1 , relay 2 , relay 3 , relay 4 , relay 5 , relay 6 , relay 7 , relay 8 and the sealing cover are grounded.
[0014] Furthermore, the operation of the present invention is as follows: by using the terminal as a test point, the touch screen is used to control the opening and closing of the relay, so as to achieve the test calibration by selecting resistors of different resistance values through the relays connected in series with R1-R7, and selecting different resistors through the LCD screen. The microprocessor controls the corresponding relays to connect different resistors. The LCD screen displays the capacitance, resistance and dielectric loss values at different frequencies. According to the selected resistance, the microcontroller automatically calculates the dielectric loss value within a wide frequency range of 0.001-1000 Hz.
[0015] Compared with the prior art, the beneficial effects of the present invention are:
[0016] 1) This utility model has the characteristics of small size, light weight, simple test method, and portability. This utility model provides a standard dielectric loss calibration device that can maintain high accuracy of dielectric loss values within a wide frequency range of 0.001-1000 Hz, solving the problem of lack of standard test pieces for wide-frequency domain dielectric loss meter testing and calibration, and improving the accuracy and precision of on-site testing. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.
[0018] Figure 1 It is a schematic diagram of the device structure of the utility model;
[0019] Figure 2 This is a schematic diagram of the test structure of the utility model;
[0020] Among them, 1. terminal; 2. vacuum capacitor top cover; 3. vacuum insulation tank; 4. first capacitor plate; 5. second capacitor plate; 6. vacuum chamber; 7. shielding cover; 8. sealing cover; 9. touch display screen. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0022] In this embodiment, please refer to Figure 1-Figure 2 , the utility model includes a vacuum capacitor, a calibration resistor selection device connected to the vacuum capacitor, and a touch screen connected to the calibration resistor selection device;
[0023] wherein the calibration resistance selection device comprises at least one resistor and a relay connected in series, or a relay, wherein the resistor and the relay are connected in series or the relay is connected to the vacuum capacitor;
[0024] The calibration resistor selection device is specifically a calibration resistor selection device in which a relay is connected to the touch screen 9, and the touch screen 9 is provided with a micro-control processing unit, which is connected to the relay through the micro-control processing unit.
[0025] The vacuum capacitor includes a vacuum insulation tank 3 and a vacuum capacitor top cover 2 mounted on the vacuum insulation tank 3. A terminal 1 is provided through the vacuum capacitor top cover 2. The terminal 1 extends into the vacuum insulation tank 3 and is connected to a first capacitor plate 4. A second capacitor plate 5 is provided on the outer side of the first capacitor plate 4. A vacuum chamber 6 is formed between the first capacitor plate 4 and the second capacitor plate 5.
[0026] A shielding cover 7 is provided at the outer end of the second capacitor plate 5 , and the shielding cover 7 passes through the vacuum insulation tank and is connected to a hollow sealing cover 8 .
[0027] In this embodiment, the calibration resistance selection device is arranged in the sealing cover 8, and the resistors include R1, R2, R3, R4, R5, R6, and R7. Relays 1, relay 2, relay 3, relay 4, relay 5, relay 6, and relay 7 are connected in series with the resistors R1, R2, R3, R4, R5, R6, and R7 respectively.
[0028] The resistors R1, R2, R3, R4, R5, R6, and R7 are connected in series with relays 1, 2, 3, 4, 5, 6, and 7, respectively, and are then connected to the second capacitor plate 5 in the vacuum capacitor. A relay 8 is also provided in the sealing cover and is connected to the second capacitor plate 5 in the vacuum capacitor.
[0029] The relays are connected to the touch screen, specifically relay 1, relay 2, relay 3, relay 4, relay 5, relay 6, relay 7, and relay 8, and are connected to the microcontroller processing unit. The resistors R1 = 10GΩ, R2 = 1GΩ, R3 = 100MΩ, R4 = 10MΩ, R5 = 1MΩ, R6 = 100kΩ, and R7 = 10kΩ. The capacitance of the vacuum capacitor is 50-100pF.
[0030] In this embodiment, the relay 1 , relay 2 , relay 3 , relay 4 , relay 5 , relay 6 , relay 7 , relay 8 and the sealing cover are grounded.
[0031] In this embodiment, for example, when the relay 8 is closed, the vacuum capacitor is directly measured, and the capacitance C is the capacitance of the vacuum capacitor.
[0032] For example, the capacitance of a vacuum capacitor is 50pF, and the capacitive reactance when the frequency is 1HZ is as shown in formula (1);
[0033] Formula (1)
[0034] For example, R4=10MΩ=0.01GΩ in series, the total impedance is 3.18GΩ.
[0035] Dielectric loss
[0036] When the frequency is 0.001HZ, the capacitive reactance of the capacitor is as shown in formula (2);
[0037] Formula (2)
[0038] If R1 is in series with 10GΩ, the total impedance is 3180GΩ.
[0039] Dielectric loss
[0040] When the frequency is 1000HZ, the capacitive reactance of the capacitor is as shown in formula (3);
[0041] Formula (3)
[0042] If R7=10kΩ in series, the total impedance is 0.01MΩ.
[0043] Dielectric loss
[0044] The above example data shows that the dielectric loss value in the wide frequency range of 0.001-1000 Hz can maintain a high degree of accuracy, which solves the problem of the lack of standard test pieces for wide-frequency domain dielectric loss meters and improves the accuracy and precision of on-site testing.
[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.
Claims
1. A dielectric loss calibration device, characterized in that: It comprises a vacuum capacitor, a calibration resistance selection device connected to the vacuum capacitor, and a touch screen (9) connected to the calibration resistance selection device; wherein the calibration resistance selection device comprises at least one resistor and a relay connected in series, or a relay, wherein the resistor and the relay are connected in series or the relay is connected to the vacuum capacitor; The calibration resistance selection device is specifically a calibration resistance selection device in which a relay is connected to the touch screen (9), and a micro-control processing unit is provided in the touch screen, which is connected to the relay via the micro-control processing unit.
2. A dielectric loss calibration device according to claim 1, characterized in that: The vacuum capacitor comprises a vacuum insulation tank (3) and a vacuum capacitor top cover (2) mounted on the vacuum insulation tank (3); a terminal (1) is provided through the vacuum capacitor top cover (2); the terminal (1) extends into the vacuum insulation tank (3) and is connected to a first capacitor plate (4); a second capacitor plate (5) is provided on the outer side of the first capacitor plate (4); and a vacuum chamber (6) is formed between the first capacitor plate (4) and the second capacitor plate (5); A shielding cover (7) is provided at the outer end of the second capacitor plate (5), and the shielding cover (7) passes through the vacuum insulation tank (3) and is connected to a hollow sealing cover (8).
3. The dielectric loss calibration device according to claim 2, characterized in that: The calibration resistance selection device is arranged in the sealing cover (8), and the resistors include R1, R2, R3, R4, R5, R6, and R7. Relays 1, relays 2, relays 3, relays 4, relays 5, relays 6, and relays 7 are connected in series with the resistors R1, R2, R3, R4, R5, R6, and R7 respectively. After the resistors R1, R2, R3, R4, R5, R6, and R7 are connected in series with relays 1, relays 2, relays 3, relays 4, relays 5, relays 6, and relays 7 respectively, they are specifically connected to the second capacitor plate (5) in the vacuum capacitor. A relay 8 is also arranged in the sealing cover, and the relay 8 is connected to the second capacitor plate (5) in the vacuum capacitor.
4. The dielectric loss calibration device according to claim 1, characterized in that: The relays are connected to the touch screen (9), specifically relay 1, relay 2, relay 3, relay 4, relay 5, relay 6, relay 7, and relay 8 are connected to the microcontroller processing unit.
5. The dielectric loss calibration device according to claim 4, characterized in that: The relay 1, relay 2, relay 3, relay 4, relay 5, relay 6, relay 7, relay 8 and the sealing cover (8) are grounded.
6. The dielectric loss calibration device according to claim 3, characterized in that: The resistors R1=10GΩ, R2=1GΩ, R3=100MΩ, R4=10MΩ, R5=1MΩ, R6=100kΩ, and R7=10kΩ, and the capacitance of the vacuum capacitor is 50-100pF.