CN210199207U - Ultralow frequency dielectric loss test system - Google Patents
Ultralow frequency dielectric loss test system Download PDFInfo
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- CN210199207U CN210199207U CN201920919864.1U CN201920919864U CN210199207U CN 210199207 U CN210199207 U CN 210199207U CN 201920919864 U CN201920919864 U CN 201920919864U CN 210199207 U CN210199207 U CN 210199207U
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Abstract
The utility model discloses an ultralow frequency dielectric loss test system, including test circuit, boost circuit, the phase difference draws and measurement system, the main control unit, the medium bridge, circuit detecting element, digital shielding unit, the signal conditioning unit, AD acquisition unit, a display module, CPU control module, communication module and print module, this dielectric loss test system is on the basis of dielectric loss tangent test zero passage time difference principle, to the characteristics that ultralow frequency power frequency is low, through measurement system and the resistance that test circuit set up, make measuring precision obtain improving, the error that brings when having eliminated effectively with resistance sampling current, digital shielding communication unit effect is through digital shielding cable transmission signal, very strong anti-electromagnetic interference ability has, make experimental result more accurate reliable.
Description
Technical Field
The utility model relates to a power loss detects technical field, specifically is ultralow frequency dielectric loss test system.
Background
At present, an insulation structure of electrical equipment is composed of various insulation media, and due to the conductance of the media, the friction of dipoles in polar media during rotation and the air gap discharge in the media, the media (or the whole insulation structure) under high voltage is lossy, the loss is called as dielectric loss, and under ultralow frequency voltage, a current transformer cannot be adopted for sampling the current of a cable medium, but only a sampling resistor can be adopted, but the access of the sampling resistor brings errors to the test of the dielectric loss tangent, the errors are large, the result of the dielectric loss measurement is influenced, the anti-interference performance is poor, the influence of other factors is easy, and the analog measurement work cannot be carried out.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem lie in overcoming the great and interference immunity subalternation defect of prior art's error, provide ultralow frequency dielectric loss test system. The ultra-low frequency dielectric loss test system has the characteristics of accurate measurement, strong anti-interference performance and the like.
In order to achieve the above object, the utility model provides a following technical scheme: the ultralow frequency dielectric loss test system comprises a test circuit, a booster circuit, a phase difference extraction and measurement system, a main control unit and a dielectric bridge, wherein the output end of the test circuit is provided with the booster circuit, the booster circuit consists of current signal amplification and processing current and voltage signal amplification and processing current, the output end of the booster circuit is electrically connected with the phase difference extraction and measurement system, the dielectric bridge is arranged between the phase difference extraction and measurement system and the booster circuit, the dielectric bridge comprises a circuit detection unit, a digital shielding unit, a signal regulation unit and an A/D acquisition unit, the circuit detection unit is used for detecting the insulation condition and various parameters of a test sample, the signal regulation unit is used for regulating the intensity of electric signals so as to obtain data under different signal intensities, and the A/D acquisition unit is used for acquiring corresponding electric signals, then transmit the master control unit, the phase difference draws and the output connection master control unit of measurement system, the master control unit includes display module, CPU control module, communication module and print module, display module and display electric connection, the display module is used for showing test data through the display, communication module and CPU control module are connected, the communication module effect is to transmit the form that detects data through the signal of telecommunication to the computer, the analysis and processing of being convenient for.
Preferably, the test circuit comprises a test power supply and three resistors, two resistors are connected in series, the other resistor is connected with the test capacitor, the test capacitor is connected with the two resistors in series in parallel, and the measurement accuracy is improved through the measurement system and the resistors arranged by the test circuit, so that errors caused by current sampling by the resistors are effectively eliminated.
Preferably, the CPU control module is in signal connection with the output end of the phase difference extraction and measurement system, so that the normal operation of the system is guaranteed.
Preferably, the input end of the digital shielding unit is electrically connected with the test circuit, and the digital shielding unit is used for transmitting signals through the digital shielding cable, so that the digital shielding unit has strong anti-electromagnetic interference capability, and the test result is more accurate and reliable.
Preferably, the display module is arranged as an LCD (liquid crystal display) screen, and the display effect is good.
Compared with the prior art, the beneficial effects of the utility model are that:
1. on the basis of the principle of zero-crossing time difference of dielectric loss tangent test, aiming at the characteristic of low frequency of an ultralow frequency power supply, the dielectric loss test system improves the measurement precision by the measuring system and the resistor arranged by the test circuit, effectively eliminates the error caused by current sampling by the resistor, designs a corresponding dielectric loss test system to improve the measurement precision according to the principle of module development, and can be directly used for measuring the dielectric loss tangent of cables under other ultralow frequency power supplies with the frequency of not 0.1 Hz;
2. the digital shielding communication unit is used for transmitting signals through a digital shielding cable, and has strong anti-electromagnetic interference capability, so that the test result is more accurate and reliable, and the dielectric loss test system can also pass through the setting of the signal adjusting unit and be used for adjusting the intensity of electric signals, so that data under different signal intensities are obtained, and the measurement result is richer.
Drawings
Fig. 1 is a structural diagram of the system circuit of the present invention.
Reference numbers in the figures: 1. a test circuit; 2. a boost circuit; 3. a phase difference extraction and measurement system; 4. a main control unit; 5. a dielectric bridge; 51. a circuit detection unit; 52. a digital shielding unit; 53. a signal conditioning unit; 54. an A/D acquisition unit; 41. a display module; 42. a CPU control module; 43. a communication module; 44. and a printing module.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: the ultralow frequency dielectric loss test system comprises a test circuit 1, a booster circuit 2, a phase difference extraction and measurement system 3, a main control unit 4 and a dielectric bridge 5, wherein the test circuit 1 consists of a test power supply and three resistors, two resistors are connected in series, the other resistor is connected with a test capacitor, the test capacitor is connected in parallel with the two resistors in series, the dielectric loss test system aims at the characteristic of low frequency of the ultralow frequency power supply on the basis of the zero-crossing time difference test principle of the dielectric loss tangent, the measurement accuracy is improved through the measurement system and the resistors arranged in the test circuit, errors caused by current sampling by the resistors are effectively eliminated, the corresponding dielectric loss test system is designed to improve the measurement accuracy according to the principle of module development, and the dielectric loss test system can be directly used for measuring the cable dielectric loss tangent under other ultralow frequency power supplies with the frequency of not 0.1Hz, the output end of the test circuit 1 is provided with a booster circuit 2, the booster circuit 2 consists of current signal amplification and processing current and voltage signal amplification and processing current, the output end of the booster circuit 2 is electrically connected with a phase difference extraction and measurement system 3, a medium bridge 5 is arranged between the phase difference extraction and measurement system 3 and the booster circuit 2, the medium bridge 5 comprises a circuit detection unit 51, a digital shielding unit 52, a signal regulation unit 53 and an A/D acquisition unit 54, the circuit detection unit 51 is used for detecting the insulation condition and various parameters of a test sample, the signal regulation unit 53 is used for regulating the intensity of electric signals so as to obtain data under different signal intensities, the A/D acquisition unit 54 is used for acquiring corresponding electric signals and then transmitting the electric signals to the main control unit 4, the output end of the phase difference extraction and measurement system 3 is connected with the main control unit 4, the main control unit 4 includes a display module 41, a CPU control module 42, a communication module 43 and a printing module 44, the display module 41 is electrically connected with a display, the display module 41 is used for displaying test data through the display, the display module 41 is arranged for an LCD (liquid crystal display), the communication module 43 is connected with the CPU control module 42, the communication module 43 is used for transmitting detection data to a computer in a form of passing through an electric signal, analysis and processing are facilitated, the CPU control module 42 is connected with an output end signal of the phase difference extraction and measurement system 3.
The theory of operation, the utility model discloses dielectric loss tester's detection principle as follows: under the action of the alternating voltage, the dielectric consumes part of the electric energy, and the part of the electric energy is converted into heat energy to generate loss. This energy loss is called dielectric loss, and when an alternating voltage is applied to a dielectric, the voltage and current in the dielectric have a phase angle difference ψ, the residual angle δ of ψ is called dielectric loss angle, and the tangent tg δ of δ is called dielectric loss tangent. the tg delta value is a parameter for measuring dielectric loss, the phase difference extraction and measurement system 3 is a mature technology through the test circuit 1, the booster circuit 2 and the phase difference extraction and measurement system 3, so that not much described here, an instrument measurement circuit comprises a standard loop Cn and a tested loop Cx, the amplitude and the phase difference of the current of the standard loop and the current of the tested loop are respectively measured through the measurement circuit 1, then the phase difference extraction and measurement system 3 adopts a digital real-time acquisition method to obtain the capacitance value and the dielectric loss tangent value of a test product through vector operation, the test circuit 1 consists of a test power supply and three resistors, two resistors are connected in series, the other resistor is connected with a test capacitor, the test capacitor is connected in parallel with the two resistors, and the measurement system and the resistors arranged through the test circuit improve the measurement precision, the error caused by sampling the current by using the resistor is effectively eliminated, meanwhile, the signal adjusting unit 53 is used for adjusting the intensity of the electric signal, so that data under different signal intensities are obtained, the LCD liquid crystal display screen in the display module 41 displays the test data through the display, and the communication module 43 is used for transmitting the detected data to the computer in the form of the electric signal, so that the analysis and the processing are convenient.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. Ultralow frequency dielectric loss test system draws and measurement system (3), main control unit (4) and medium electric bridge (5), its characterized in that including test circuit (1), boost circuit (2), phase difference: the output end of the test circuit (1) is provided with a booster circuit (2), the booster circuit (2) is composed of a current signal amplifying and processing circuit and a voltage signal amplifying and processing circuit, the output end of the booster circuit (2) is electrically connected with a phase difference extracting and measuring system (3), a dielectric bridge (5) is arranged between the phase difference extracting and measuring system (3) and the booster circuit (2), the dielectric bridge (5) comprises a circuit detection unit (51), a digital shielding unit (52), a signal adjusting unit (53) and an A/D acquisition unit (54), the circuit detection unit (51) is used for detecting the insulation condition and various parameters of a test article, the signal adjusting unit (53) is used for adjusting the intensity of an electric signal so as to obtain data under different signal intensities, and the A/D acquisition unit (54) is used for acquiring corresponding electric signals, then transmit main control unit (4), main control unit (4) is connected with the output of measurement system (3) to phase difference extraction, main control unit (4) include display module (41), CPU control module (42), communication module (43) and print module (44), display module (41) and display electric connection, display module (41) are used for showing experimental data through the display, communication module (43) are connected with CPU control module (42), communication module (43) are used for transmitting the form of detecting data through the signal of telecommunication to the computer, are convenient for analysis and processing.
2. The ultra low frequency dielectric loss test system of claim 1, wherein: the testing circuit (1) is composed of a testing power supply and three resistors, wherein the two resistors are connected in series, the other resistor is connected with a testing capacitor, and the testing capacitor is connected with the two resistors in series in parallel.
3. The ultra low frequency dielectric loss test system of claim 1, wherein: the CPU control module (42) is in signal connection with the output end of the phase difference extraction and measurement system (3).
4. The ultra low frequency dielectric loss test system of claim 1, wherein: the input end of the digital shielding unit (52) is electrically connected with the test circuit (1).
5. The ultra low frequency dielectric loss test system of claim 1, wherein: the display module (41) is arranged for an LCD (liquid crystal display).
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113252990A (en) * | 2021-04-23 | 2021-08-13 | 深圳供电局有限公司 | Cable dielectric loss testing device |
CN114859186A (en) * | 2022-04-11 | 2022-08-05 | 江苏邦士医疗科技有限公司 | Device and method for rapidly measuring lowest dielectric strength margin |
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2019
- 2019-06-19 CN CN201920919864.1U patent/CN210199207U/en active Active
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113252990A (en) * | 2021-04-23 | 2021-08-13 | 深圳供电局有限公司 | Cable dielectric loss testing device |
CN114859186A (en) * | 2022-04-11 | 2022-08-05 | 江苏邦士医疗科技有限公司 | Device and method for rapidly measuring lowest dielectric strength margin |
CN114859186B (en) * | 2022-04-11 | 2023-05-09 | 江苏邦士医疗科技有限公司 | Device and method for rapidly measuring minimum dielectric strength margin |
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Addressee: SHANGHAI DAFAN ELECTRICAL EQUIPMENT Co.,Ltd. Document name: Review of business letter |