CN213813763U - Little current detection device of transformer wide band dielectric loss detecting system - Google Patents
Little current detection device of transformer wide band dielectric loss detecting system Download PDFInfo
- Publication number
- CN213813763U CN213813763U CN202022666791.5U CN202022666791U CN213813763U CN 213813763 U CN213813763 U CN 213813763U CN 202022666791 U CN202022666791 U CN 202022666791U CN 213813763 U CN213813763 U CN 213813763U
- Authority
- CN
- China
- Prior art keywords
- module
- frequency
- low
- current
- output end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 238000006243 chemical reaction Methods 0.000 claims abstract description 49
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 45
- 238000001914 filtration Methods 0.000 claims abstract description 44
- 230000003321 amplification Effects 0.000 claims abstract description 41
- 239000004065 semiconductor Substances 0.000 claims description 20
- 230000001629 suppression Effects 0.000 claims description 17
- 238000004458 analytical method Methods 0.000 claims description 5
- 230000007423 decrease Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 12
- 230000004044 response Effects 0.000 description 8
- 238000004891 communication Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003750 conditioning effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000001566 impedance spectroscopy Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model discloses a little current detection device of transformer wide band dielectric loss detecting system, include: the device comprises a low-frequency input module, a high-frequency input module, a range switch switching module, a conversion amplification filtering module, a dual-channel ADC acquisition module and an upper computer; the range switch switching module is connected with the low-frequency input module and the high-frequency input module; the conversion amplification filtering module is connected with the output end of the range switch switching module; the double-channel ADC acquisition module is connected with the output end of the conversion amplification filtering module; the upper computer is connected with the output end of the double-channel ADC acquisition module; the output end of the upper computer is connected with the range switch switching module and used for sending gating signals to the range switch switching module. The utility model overcomes the difficulty that weak signal can not the wide range frequency detection in the conventional transformer dielectric loss system, promoted accuracy and reliability that the transformer mesoscopic decreases the system detection by a wide margin.
Description
Technical Field
The utility model belongs to little current detection area of transformer oiled paper insulating medium response, concretely relates to little current detection device of transformer wide band dielectric loss detecting system.
Background
The power transformer is the most critical device for ensuring the safe operation of the power system as the core of energy conversion in the process of electric energy transmission and distribution. The insulation performance of the transformer is an important index for measuring whether the power equipment can work normally. From the analysis results of the reliability indexes of the high-voltage power transmission and transformation facilities at home and abroad, the insulation fault is one of the main reasons for causing the unplanned shutdown of the transformer, and in fact, the power failure accident caused by most insulation faults can be avoided only by regular maintenance. In order to be able to detect such defects in a timely manner and avoid irreparable economic losses, reliable and sensitive insulation detection measures are required. At present, on the basis of a dielectric response theory, a frequency domain dielectric spectroscopy is a common method, micro-current signals of certain different frequency bands usually exist in an insulating medium, and the performance of a transformer can be judged by detecting the threshold value of the micro-current. However, the conventional dielectric loss detection system cannot perform wide-range detection and has certain use limitation.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a little current detection device of transformer wide band meson decreases detecting system can be at the accurate numerical value that detects little current of broad within range, has solved for a long time to have meson and has decreased the drawback that detecting system can not the broad range detect.
In order to achieve the above object, the utility model discloses a concrete scheme does: a little current detection device of transformer wide band loss detection system that calms, includes:
a low frequency input module;
a high frequency input module;
the range switch switching module is connected with the low-frequency input module and the high-frequency input module and is used for gating the low-frequency input module and the high-frequency input module;
the conversion amplification filtering module is connected with the output end of the range switch switching module and is used for converting the current output by the low-frequency input module or the high-frequency input module into a low-frequency voltage signal or a high-frequency voltage signal;
the double-channel ADC acquisition module is connected with the output end of the conversion amplification filtering module and is used for converting the low-frequency voltage signal or the high-frequency voltage signal into a digital signal;
the upper computer is connected with the output end of the double-channel ADC acquisition module and used for receiving the digital signal and acquiring micro-current data output by the input module;
the output end of the upper computer is connected with the range switch switching module and used for sending gating signals to the range switch switching module.
The conversion amplification filtering module comprises: the two channels with the same structure are respectively connected with the low-frequency input module or the high-frequency input module and are used for respectively transmitting low-frequency current or high-frequency current;
the passageway, comprising:
the conversion amplification module is connected with the output end of the range switch switching module and is used for converting the current output by the low-frequency input module or the high-frequency input module into a voltage signal;
the band-pass filtering module is arranged at the output end of the conversion amplifying module and is used for filtering the voltage signal;
the temperature drift suppression post-stage amplification module is arranged at the output end of the band-pass filtering module and is used for performing temperature drift suppression on the voltage signal;
the output end of the temperature drift suppression post-stage amplification module is connected with the input end of the dual-channel ADC acquisition module.
The conversion amplifying module comprises:
2 pre-stage protection modules which are connected with the output end of the range switch switching module and are respectively used for limiting the low-frequency current or the high-frequency current output by the range switch switching module;
the 2 electrometer amplifier modules are all arranged at the output end of the preceding stage protection module and are respectively used for amplifying the low-frequency current or the high-frequency current output by the preceding stage protection module;
the 2 current-voltage conversion modules are all arranged at the output end of the electrometer amplifier module and are respectively used for carrying out piezoelectric conversion on the low-frequency current or the high-frequency current output by the electrometer amplifier module to obtain a low-frequency signal or a high-frequency signal;
the band-pass filtering module comprises:
the low-frequency band-pass filter is arranged at the output end of the current-voltage conversion module and is used for filtering the low-frequency signal;
or, the high-frequency band-pass filter is arranged at the output end of the current-voltage conversion module and is used for filtering the high-frequency signal;
the temperature drift suppression post-amplification module comprises:
the 2 instrument amplifier modules are respectively connected with the output ends of the low-frequency band-pass filter or the high-frequency band-pass filter and used for amplifying low-frequency signals and high-frequency signals output by the low-frequency band-pass filter or the high-frequency band-pass filter;
2 decoupling modules of the power supply, which are respectively connected with the 2 instrumentation amplifier modules and used for providing stable power supply for the instrumentation amplifier modules;
the 2 output potential shielding ring modules are respectively connected with the output ends of the 2 instrumentation amplifier modules and used for reducing leakage current of the output ends of the instrumentation amplifier modules;
and 2, the output ends of the decoupling modules of the power supply are connected with the input end of the double-channel ADC acquisition module.
The range switch switching module comprises:
a semiconductor switching device;
the driving module is connected with the semiconductor switch device and used for receiving a signal of the upper computer to drive the semiconductor switch device to be switched on and off;
the detection protection module is connected with the semiconductor switch device and is used for performing overvoltage and overcurrent protection on the semiconductor switch device;
the driving module is simultaneously connected with the upper computer and used for receiving the instruction of the upper computer.
The two-channel ADC acquisition module comprises:
the signal conditioner is connected with the output end of the conversion amplification filtering module and is used for carrying out nonlinear compensation on the low-frequency voltage signal or the high-frequency voltage signal output by the conversion amplification filtering module;
the ADC is connected with the output end of the signal conditioner and is used for converting the signal output by the signal conditioner into a digital signal;
the MCU controller is connected with the ADC and is used for controlling the acquisition time sequence of the ADC;
the memory is connected with the MCU controller and used for storing the digital signal output by the ADC;
the MCU controller is connected with the upper computer and used for sending the digital signals to the upper computer for analysis.
Has the advantages that: the utility model discloses an adopt the resistance feedback method and adopt the amplifier chip of electrometer level to jointly carry out the sampling of weak electric current, reached good detection effect to can be in wide frequency range to the transformer be situated between the little electric current that decreases and carry out effective and accurate detection, overcome the difficulty that weak signal can not wide range frequency detection in the conventional transformer dielectric loss system, promoted the accuracy and the reliability that transformer situated between decreases the system detection by a wide margin.
Drawings
Fig. 1 is a schematic block diagram of the system of the present invention.
Fig. 2 is a schematic diagram of a span switch switching module.
Fig. 3 is a schematic circuit diagram of a pre-stage protection module passing low-frequency current.
Fig. 4 is a schematic circuit diagram of a preceding stage protection module through which a high frequency current passes.
FIG. 5 is a circuit schematic of an electrometer amplifier module that amplifies low frequency current.
Fig. 6 is a schematic circuit diagram of an electrometer amplifier module that amplifies high frequency current.
Fig. 7 is a circuit schematic of a low frequency band pass filter.
Fig. 8 is a schematic circuit diagram of a high-frequency band-pass filter.
Fig. 9 is a schematic diagram of a circuit for suppressing a temperature drift of a low-frequency signal.
Fig. 10 is a schematic diagram of a circuit for suppressing a temperature drift of a high-frequency signal.
Fig. 11 is a functional block diagram of a dual channel ADC acquisition module.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
It is to be understood that: herein, 1mHz-1Hz is defined as a low frequency part, and 10Hz-1kHz is defined as a high frequency part.
In order to achieve the above object, the utility model discloses a concrete scheme does: a little current detection device of transformer wide band loss detection system that calms, includes: the device comprises a low-frequency input module, a high-frequency input module, a range switch switching module, a conversion amplification filtering module, a dual-channel ADC acquisition module and an upper computer;
the range switch switching module is connected with the low-frequency input module and the high-frequency input module and is used for gating the low-frequency input module and the high-frequency input module; the conversion amplification filtering module is connected with the output end of the range switch switching module and is used for converting the current output by the low-frequency input module or the high-frequency input module into a low-frequency voltage signal or a high-frequency voltage signal; the double-channel ADC acquisition module is connected with the output end of the conversion amplification filtering module and is used for converting the low-frequency voltage signal or the high-frequency voltage signal into a digital signal; the upper computer is connected with the output end of the double-channel ADC acquisition module and used for receiving the digital signal and acquiring micro-current data output by the input module; the output end of the upper computer is connected with the range switch switching module and used for sending gating signals to the range switch switching module.
Further, the transform-amplification filtering module includes: the two channels with the same structure are respectively connected with the low-frequency input module or the high-frequency input module and are used for respectively transmitting low-frequency current or high-frequency current;
the passageway, comprising: the temperature drift suppression device comprises a conversion amplification module, a band-pass filtering module and a temperature drift suppression post-stage amplification module; the conversion amplification module is connected with the output end of the range switch switching module and is used for converting the current output by the low-frequency input module or the high-frequency input module into a voltage signal; the band-pass filtering module is arranged at the output end of the conversion amplifying module and is used for filtering the voltage signal; the temperature drift suppression post-stage amplification module is arranged at the output end of the band-pass filtering module and is used for performing temperature drift suppression on the voltage signal; the output end of the temperature drift suppression post-stage amplification module is connected with the input end of the dual-channel ADC acquisition module.
The conversion amplifying module comprises: 2 preceding stage protection modules, 2 electrometer amplifier modules and 2 current-voltage conversion modules; the 2 preceding stage protection modules are connected with the output end of the range switch switching module and are respectively used for limiting the low-frequency current or the high-frequency current output by the range switch switching module; the 2 electrometer amplifier modules are all arranged at the output end of the preceding stage protection module and are respectively used for amplifying low-frequency current or high-frequency current output by the preceding stage protection module; the 2 current-voltage conversion modules are arranged at the output end of the electrometer amplifier module and are respectively used for carrying out piezoelectric conversion on the low-frequency current or the high-frequency current output by the electrometer amplifier module to obtain a low-frequency signal or a high-frequency signal;
the band-pass filtering module comprises: a low frequency band pass filter or a high frequency band pass filter; the low-frequency band-pass filter is arranged at the output end of the current-voltage conversion module and is used for filtering the low-frequency signal; the high-frequency band-pass filter is arranged at the output end of the current-voltage conversion module and is used for filtering the high-frequency signal;
the temperature drift suppression post-amplification module comprises: 2 instrument amplifier modules, 2 decoupling modules of power supply and 2 output potential shielding ring modules; the 2 instrument amplifier modules are respectively connected with the output ends of the low-frequency band-pass filter or the high-frequency band-pass filter and used for amplifying low-frequency signals and high-frequency signals output by the low-frequency band-pass filter or the high-frequency band-pass filter; the 2 decoupling modules of the power supply are respectively connected with the 2 instrumentation amplifier modules and used for providing stable power supply for the instrumentation amplifier modules; the 2 output potential shielding ring modules are respectively connected with the output ends of the 2 instrumentation amplifier modules and used for reducing leakage current of the output ends of the instrumentation amplifier modules; and 2, the output ends of the decoupling modules of the power supply are connected with the input end of the double-channel ADC acquisition module.
The range switch switching module comprises: the device comprises a semiconductor switch device, a driving module and a detection protection module; the driving module is connected with the semiconductor switch device and used for receiving a signal of the upper computer to drive the semiconductor switch device to be switched on and off; the detection protection module is connected with the semiconductor switch device and is used for performing overvoltage and overcurrent protection on the semiconductor switch device; the driving module is simultaneously connected with the upper computer and used for receiving the instruction of the upper computer.
The two-channel ADC acquisition module comprises: the device comprises a signal conditioner, an ADC (analog-to-digital converter), an MCU (microprogrammed control unit) controller and a memory; the signal conditioner is connected with the output end of the conversion amplification filtering module and is used for carrying out nonlinear compensation on the low-frequency voltage signal or the high-frequency voltage signal output by the conversion amplification filtering module; the ADC is connected with the output end of the signal conditioner and is used for converting the signal output by the signal conditioner into a digital signal; the MCU controller is connected with the ADC and is used for controlling the acquisition time sequence of the ADC; the memory is connected with the MCU controller and used for storing the digital signal output by the ADC; the MCU controller is connected with the upper computer and used for sending the digital signals to the upper computer for analysis.
Specific example I:
fig. 1 is a schematic diagram of a micro-current detection device provided by the present invention, wherein a low frequency input module is 1mHz-1 Hz; the high-frequency input module is 10Hz-1kHz, and comprises two small current input modules, a range switch switching module, an I-V conversion amplification module, a band-pass filtering module, a temperature drift suppression post-stage amplification module, a dual-channel ADC acquisition module and an upper computer.
The low-frequency input module is 1mHz-1Hz, the high-frequency input module is 10Hz-1kHz, the low-current input module realizes the input of response current wide-range frequency current in an insulating medium of the transformer, the range switch switching module is a change-over switch which can be controlled by an upper computer, the change-over amplification module converts a response current signal in the insulating medium into a voltage signal and realizes the first-stage amplification band-pass filtering module to filter out interference noise which is not in a required frequency band, the temperature drift suppression post-stage amplification module realizes the accurate acquisition and the second-stage amplification of the small signal, the dual-channel ADC acquisition module realizes the analog-to-digital conversion of the response current signals of different frequency bands, and the upper computer realizes the acquisition of control signals and the switching of the range switch.
The 1mHz-1Hz and 10Hz-1kHz low-current input modules mainly aim at the collection of response current in the insulating medium of the transformer, the frequency range of the response current is wide, and the continuous collection from 1mHz-1Hz and 10Hz-1kHz can be realized.
The range switch switching module comprises a controllable semiconductor switching device, a driving module of the switching device and a detection protection module of overvoltage and overcurrent of the switching device. The controllable semiconductor switch device can be a switch device with low power consumption and good switching characteristics such as a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) and an Insulated Gate Bipolar Transistor (IGBT), a driving module of the switch device mainly receives signals from an upper computer to drive the semiconductor device to be switched on and off, switching of switches in different frequency bands is realized, and the overvoltage and overcurrent detection protection module avoids damage of the device for preventing overvoltage or overcurrent caused by misoperation of the controllable semiconductor switch device.
The conversion and amplification module is divided into a high-frequency amplification part and a low-frequency amplification part, and each part comprises a pre-stage protection module, a flying-ampere-grade electrometer amplifier module and a current-voltage conversion module. The forestage protection module is composed of a filter capacitor, a gas discharge tube, a piezoresistor and the like, and provides a safe and reliable input current signal for the post-stage Feampere-grade electrometer amplification module. The electrometer amplifier module of the ann level has divided into the electrometer amplifier of high-frequency level and the electrometer amplifier of low-frequency level, the electrometer amplifier of high-frequency level select a money to be OPA192 as the preceding stage of the weak signal of high frequency and amplify, have the advantage of low input bias current, low offset voltage, low-voltage noise and wide bandwidth, the electrometer amplifier of low-frequency level select a money to be ADA4530 as the preceding stage of the weak signal of low frequency and amplify, also have the advantage of low input bias current, low offset voltage, low-voltage noise and wide bandwidth. The current-voltage conversion module is an amplification module
The band-pass filtering module comprises a three-stage low-frequency band-pass filter and a two-stage high-frequency band-pass filter, three OP281 are selected as main devices of the active filter in a low-frequency band-pass filter schematic diagram, the filtering effect that the withstand voltage is not lower than 10kV, the cut-off frequency is 1Hz and the characteristic impedance is 1k omega can be achieved, noise of other frequency bands not in the frequency range is effectively filtered, and the anti-interference capability of signals and the reliability of the signals are guaranteed. In a high-frequency band-pass filter principle diagram, two ADA4062 are selected as main devices of an active filter, and the filtering effect that the withstand voltage is not lower than 10kV, the cut-off frequency is 1kHz, and the characteristic impedance is 1k omega can be realized. Effectively filtering out the noise of other frequency bands which are not in the frequency range, and ensuring the anti-interference capability and the reliability of the signals.
The temperature drift suppression post-stage amplification module is divided into a high-frequency part and a low-frequency part and comprises a decoupling module of a power supply, a high-precision instrument amplifier module and an output potential shielding ring module. The power supply decoupling module mainly provides a power supply with high stability and strong anti-interference capability for the high-precision instrument amplifier module. The high-precision instrument amplifier module selects a high-precision amplifier of PGA281 from a low-frequency module, the amplifier in the module has the functions of numerical control gain and signal integrity test, so that excellent common mode rejection larger than 110dB is provided in a wide frequency range, and the high-precision instrument amplifier module has better common mode and power supply rejection capability, selects a high-precision instrument amplifier of INA101 from a high-frequency module, and can well realize temperature drift rejection aiming at high-frequency signals in the high-frequency module; the output potential shielding ring ensures that the potentials in the ring are equal, so that the existence of leakage current is reduced to the maximum extent.
The dual-channel ADC acquisition module comprises a signal conditioning circuit module, an ADC analog-to-digital converter circuit module, an MCU control circuit module, a memory module and the like. The signal conditioning circuit mainly provides reasonable input signals for the ADC. The ADC acquisition module is at least provided with two independent synchronous acquisition channels, the response current of the transformer insulation medium can be converted into a digital signal, the sampling rate of each sampling channel of the double-channel AD conversion chip is 5MS/s or more, and the sampling digit is 8bit or more. And the MCU controls the acquisition time sequence of the AD conversion chip and temporarily stores the conversion result in the memory. The memory is provided with two read-write channels, one channel is used for data writing, and the other channel is used for data reading. And the data reading interface is connected with the data reading and writing interface of the MCU module.
The upper computer comprises a communication module arranged on the lower computer, and the upper computer software of the software system in the upper computer sends and controls the analysis of the instruction. The lower computer communication module is used for real-time communication between the upper computer and the lower computer, and the communication module comprises wired or wireless communication interfaces such as a USB (universal serial bus), a serial port, Bluetooth and wifi, so that transmission of detection results, control instructions, video signals and the like is realized.
It is to be understood that: none of the art described herein is admitted to be prior art.
The above description is only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily change or replace the technical scope of the present invention. Therefore, the protection scope of the present invention is subject to the protection scope of the claims.
Claims (5)
1. A little current detection device of transformer wide band loss detection system that situated between, its characterized in that includes:
a low frequency input module;
a high frequency input module;
the range switch switching module is connected with the low-frequency input module and the high-frequency input module and is used for gating the low-frequency input module and the high-frequency input module;
the conversion amplification filtering module is connected with the output end of the range switch switching module and is used for converting the current output by the low-frequency input module or the high-frequency input module into a low-frequency voltage signal or a high-frequency voltage signal;
the double-channel ADC acquisition module is connected with the output end of the conversion amplification filtering module and is used for converting the low-frequency voltage signal or the high-frequency voltage signal into a digital signal;
the upper computer is connected with the output end of the double-channel ADC acquisition module and used for receiving the digital signal and acquiring micro-current data output by the input module;
the output end of the upper computer is connected with the range switch switching module and used for sending gating signals to the range switch switching module.
2. The apparatus of claim 1, wherein the transform, amplification and filtering module comprises: the two channels with the same structure are respectively connected with the low-frequency input module or the high-frequency input module and are used for respectively transmitting low-frequency current or high-frequency current;
the passageway, comprising:
the conversion amplification module is connected with the output end of the range switch switching module and is used for converting the current output by the low-frequency input module or the high-frequency input module into a voltage signal;
the band-pass filtering module is arranged at the output end of the conversion amplifying module and is used for filtering the voltage signal;
the temperature drift suppression post-stage amplification module is arranged at the output end of the band-pass filtering module and is used for performing temperature drift suppression on the voltage signal;
the output end of the temperature drift suppression post-stage amplification module is connected with the input end of the dual-channel ADC acquisition module.
3. The micro-current detection device of the transformer broadband dielectric loss detection system according to claim 2, wherein:
the conversion amplifying module comprises:
2 pre-stage protection modules which are connected with the output end of the range switch switching module and are respectively used for limiting the low-frequency current or the high-frequency current output by the range switch switching module;
the 2 electrometer amplifier modules are all arranged at the output end of the preceding stage protection module and are respectively used for amplifying the low-frequency current or the high-frequency current output by the preceding stage protection module;
the 2 current-voltage conversion modules are all arranged at the output end of the electrometer amplifier module and are respectively used for carrying out piezoelectric conversion on the low-frequency current or the high-frequency current output by the electrometer amplifier module to obtain a low-frequency signal or a high-frequency signal;
the band-pass filtering module comprises:
the low-frequency band-pass filter is arranged at the output end of the current-voltage conversion module and is used for filtering the low-frequency signal;
or, the high-frequency band-pass filter is arranged at the output end of the current-voltage conversion module and is used for filtering the high-frequency signal;
the temperature drift suppression post-amplification module comprises:
the 2 instrument amplifier modules are respectively connected with the output ends of the low-frequency band-pass filter or the high-frequency band-pass filter and used for amplifying low-frequency signals and high-frequency signals output by the low-frequency band-pass filter or the high-frequency band-pass filter;
2 decoupling modules of the power supply, which are respectively connected with the 2 instrumentation amplifier modules and used for providing stable power supply for the instrumentation amplifier modules;
the 2 output potential shielding ring modules are respectively connected with the output ends of the 2 instrumentation amplifier modules and used for reducing leakage current of the output ends of the instrumentation amplifier modules;
and 2, the output ends of the decoupling modules of the power supply are connected with the input end of the double-channel ADC acquisition module.
4. The micro-current detection device of the transformer broadband dielectric loss detection system according to claim 1, wherein the range switch switching module comprises:
a semiconductor switching device;
the driving module is connected with the semiconductor switch device and used for receiving a signal of the upper computer to drive the semiconductor switch device to be switched on and off;
the detection protection module is connected with the semiconductor switch device and is used for performing overvoltage and overcurrent protection on the semiconductor switch device;
the driving module is simultaneously connected with the upper computer and used for receiving the instruction of the upper computer.
5. The micro-current detection device of the transformer broadband dielectric loss detection system according to claim 1, wherein the dual-channel ADC acquisition module comprises:
the signal conditioner is connected with the output end of the conversion amplification filtering module and is used for carrying out nonlinear compensation on the low-frequency voltage signal or the high-frequency voltage signal output by the conversion amplification filtering module;
the ADC is connected with the output end of the signal conditioner and is used for converting the signal output by the signal conditioner into a digital signal;
the MCU controller is connected with the ADC and is used for controlling the acquisition time sequence of the ADC;
the memory is connected with the MCU controller and used for storing the digital signal output by the ADC;
the MCU controller is connected with the upper computer and used for sending the digital signals to the upper computer for analysis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022666791.5U CN213813763U (en) | 2020-11-18 | 2020-11-18 | Little current detection device of transformer wide band dielectric loss detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022666791.5U CN213813763U (en) | 2020-11-18 | 2020-11-18 | Little current detection device of transformer wide band dielectric loss detecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213813763U true CN213813763U (en) | 2021-07-27 |
Family
ID=76935742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022666791.5U Active CN213813763U (en) | 2020-11-18 | 2020-11-18 | Little current detection device of transformer wide band dielectric loss detecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213813763U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115453194A (en) * | 2022-11-04 | 2022-12-09 | 石家庄银河微波技术股份有限公司 | Front protection device and test system of frequency spectrograph |
-
2020
- 2020-11-18 CN CN202022666791.5U patent/CN213813763U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115453194A (en) * | 2022-11-04 | 2022-12-09 | 石家庄银河微波技术股份有限公司 | Front protection device and test system of frequency spectrograph |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN213813763U (en) | Little current detection device of transformer wide band dielectric loss detecting system | |
| CN209992574U (en) | Electric automobile insulation resistance detection circuitry | |
| CN105572453A (en) | Voltage acquisition electronic sensor apparatus | |
| CN103368524A (en) | Signal conditioning circuit for remote monitoring system of distribution transformer | |
| CN103986116A (en) | Primary-current detection and control module and method based on FPGA | |
| CN106532626A (en) | Instantaneous overcurrent protection circuit of medium-high voltage variable-frequency speed regulating device and frequency converter | |
| CN204214953U (en) | For the dielectric spectroscopy measurement mechanism of bushing | |
| CN220289829U (en) | Eight-channel residual current transformer broken wire and short wire detection circuit | |
| CN204515523U (en) | A kind of controller switching equipment and multichannel AC synchronized sampling unit thereof | |
| CN115201649B (en) | Driving circuit for realizing IGBT state monitoring by spontaneous short-circuit current | |
| CN107395184B (en) | Monitoring integrated diode array driving power soft switching circuit | |
| CN113884747B (en) | Overvoltage measuring device of electronic transformer | |
| CN213813842U (en) | Transformer insulation detection device based on frequency domain dielectric spectroscopy | |
| CN205158598U (en) | Electric fire monitors detector with failure detector circuit | |
| CN220983389U (en) | Portable broadband harmonic measurement device | |
| CN113884847A (en) | Large-dynamic-range partial discharge ultrahigh frequency signal detection circuit | |
| CN209589291U (en) | Temperature sampling circuit and AuCT system | |
| CN208607278U (en) | A kind of current testing device for CVT secondary voltage test device | |
| CN202886479U (en) | Insulation resistance-to-ground sampling signal processing circuit for photovoltaic grid-connection system | |
| CN214067255U (en) | Secondary signal acquisition device of capacitor voltage transformer | |
| CN216051928U (en) | Overhead transmission line power frequency current acquisition circuit | |
| CN219456777U (en) | Temperature control circuit with abnormality detection circuit | |
| CN217427771U (en) | Intelligent online monitoring system for state of power equipment based on pulse signals | |
| CN108963966A (en) | A kind of distribution controller for power supply and distribution | |
| CN203278402U (en) | Signal conditioner of distribution transformer remote monitoring system based on wireless communication |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |