CN214097754U - A test device for verifying DC PD ultra-wideband detection system - Google Patents
A test device for verifying DC PD ultra-wideband detection system Download PDFInfo
- Publication number
- CN214097754U CN214097754U CN202022785293.2U CN202022785293U CN214097754U CN 214097754 U CN214097754 U CN 214097754U CN 202022785293 U CN202022785293 U CN 202022785293U CN 214097754 U CN214097754 U CN 214097754U
- Authority
- CN
- China
- Prior art keywords
- voltage
- ultra
- detection system
- verifying
- 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
Images
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
本实用新型涉及一种用于验证直流PD超宽频带检测系统的试验装置，包括调压器、高压直流发生器、水电阻、直流分压器、耦合电容器、双回路投切开关、试品、测量阻抗、数据采集模块、工控机、信号接头盒和终端，调压器的输出端与高压直流发生器相连，高压直流发生器与水电阻相连，水电阻与直流分压器串联，双回路投切开关、试品和测量阻抗串联连接，串联线路与耦合电容器并联连接，然后并联线路接入水电阻与直流分压器之间的线路，数据采集模块的输入端分别与直流分压器和测量阻抗相连，数据采集模块的输出端与工控机相连，信号接头盒的输入端分别与直流分压器和测量阻抗相连，输出端与终端相连。与现有技术相比，本实用新型具有可信度高等优点。
The utility model relates to a test device for verifying a DC PD ultra-wideband detection system, comprising a voltage regulator, a high-voltage DC generator, a water resistance, a DC voltage divider, a coupling capacitor, a double-circuit switching switch, a test product, Measurement impedance, data acquisition module, industrial computer, signal connector box and terminal, the output end of the voltage regulator is connected to the high-voltage DC generator, the high-voltage DC generator is connected to the water resistance, the water resistance is connected to the DC voltage divider in series, and the double-loop input The switch, the test sample and the measurement impedance are connected in series, the series line is connected in parallel with the coupling capacitor, and then the parallel line is connected to the line between the water resistance and the DC voltage divider, and the input end of the data acquisition module is respectively connected with the DC voltage divider and the measurement The impedance is connected, the output end of the data acquisition module is connected with the industrial computer, the input end of the signal connector box is respectively connected with the DC voltage divider and the measuring impedance, and the output end is connected with the terminal. Compared with the prior art, the utility model has the advantages of high reliability.
Description
Technical Field
The utility model belongs to the technical field of direct current PD ultra wide band detecting system's test verification technique and specifically relates to a test device for verifying direct current PD ultra wide band detecting system.
Background
Pulse current detection method for Partial Discharge (PD) of large transformer, which is a method for detecting partial discharge of large transformer according to the method specified in GB/T7354, has the longest and most extensive application history. However, with the continuous improvement of the voltage level of the power grid and the large investment of the converter transformer, the traditional PD pulse current detection method has been more and more difficult to meet the requirements of field tests, and needs to be improved urgently.
Different from a power transformer, a PD test under direct-current voltage is only performed on a valve side, and pulse current methods adopted for factory and field PD tests of the converter transformer are described in fig. 1. However, for field handover and fault diagnosis tests, the working conditions that interference pulse signals are difficult to eliminate exist under a complex electromagnetic background. Under the working conditions, the implementation difficulty of an anti-interference technology under the GB/T7354 standard recommended detection bandwidth (less than or equal to 1MHz) is high, and PD has no phase reference information under direct current voltage, so that a field direct current withstand voltage PD test cannot process randomly-appearing interference pulses, particularly the working condition of external corona exists, the direct current withstand voltage PD of the current converter transformer is only carried out when the current converter transformer leaves a factory, and the alternating current withstand voltage PD test is only carried out on the field. Because the direct current test cannot be replaced by the alternating current test, uncertainty is brought to zero defect commissioning of the converter transformer, particularly a valve side winding, and the uncertainty can be one of the reasons for frequent faults of the converter transformer (including a sleeve) under the operation condition at present.
Relevant research shows that the PD test system based on the ultra-wideband detection can realize the separation of multiple PD sources and noise sources based on a pulse group classification technology. However, the direct current PD ultra-wideband detection system and the related test verification platform of the direct current PD ultra-wideband detection system are lacking, and particularly, a test platform capable of simulating an external corona working condition in a discharge and voltage withstand test in transformer oil is needed, and a device capable of performing test verification on the direct current PD ultra-wideband detection system is urgently needed in the present stage.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a reliable test device who is used for verifying direct current PD ultra wide band detecting system of degree of reliability of result in order to overcome the defect that above-mentioned prior art exists.
The purpose of the utility model can be realized through the following technical scheme:
a test device for verifying a direct current PD ultra-wideband detection system comprises a voltage regulator, a high-voltage direct current generator, a water resistor, a direct current voltage divider, a coupling capacitor, a double-loop switching switch, a test article, a measurement impedance, a data acquisition module, an industrial personal computer, a signal connector box and a terminal;
the input end of the voltage regulator is connected with 220V alternating current, and the output end of the voltage regulator is connected with the input end of the high-voltage direct current generator; the output end of the high-voltage direct current generator is connected with a water resistor; the water resistor is connected with the direct current voltage divider in series;
the double-loop fling-cut switch, the test article and the measuring impedance are connected in series; the series circuit consisting of the double-loop fling-cut switch, the test article and the measuring impedance is connected with the coupling capacitor in parallel; the parallel circuit formed by the double-loop fling-cut switch, the test article, the measuring impedance and the coupling capacitor is connected to the circuit between the water resistor and the direct-current voltage divider;
the input end of the data acquisition module is respectively connected with the direct current voltage divider and the measuring impedance; the output end of the data acquisition module is connected with an industrial personal computer;
the input end of the signal connector box is respectively connected with the direct current voltage divider and the measuring impedance, and the output end of the signal connector box is connected with the terminal.
Preferably, the voltage regulator is a single-phase voltage regulator of 0-400V.
Preferably, the high voltage direct current generator comprises four secondary side windings L1、L2、L3And L4Two full wave bridge rectifier silicon stacks D1And D2A filter capacitor C and a load R; the four secondary side windings L1、L2、L3And L4Are respectively arranged corresponding to the primary side winding of the voltage regulator; the secondary side winding L1And L2Series connected full wave bridge type rectifying silicon stack D1A power source terminal of (a); the secondary side winding L3And L4Series connected full wave bridge type rectifying silicon stack D2A power source terminal of (a); the full-wave bridge type rectifier silicon stack D2The negative end of the output end of the rectifier is grounded, the positive end of the output end of the rectifier is connected with a full-wave bridge rectifier silicon stack D1The negative end of the output end of the filter is connected with the negative end of the filter; the full-wave bridge type rectifier silicon stack D1The positive end of the output end of the filter is connected with the filter capacitor C; the other end of the filter capacitor is grounded; the load R is connected with the filter capacitor C in parallel.
Preferably, the water resistance is 100k Ω.
Preferably, the dc voltage divider is a resistive voltage divider.
Preferably, the coupling capacitor is a 100kV non-partial-discharge coupling capacitor for a 100pF PD test.
Preferably, the test pieces comprise a tip discharge model test piece Cx1 in oil and a corona discharge model test piece Cx2 in air; one end of the test article is connected with the double-loop switching switch, and the other end of the test article is connected with the measuring impedance.
Preferably, the measuring impedance comprises a voltage protector P and a non-inductive resistor Rd(ii) a The voltage protector P and the non-inductive resistor RdAre connected in parallel.
Preferably, the data acquisition module includes a first partial discharge PD channel and a first voltage V channel; the front end of the first PD channel is connected with a 100 kHz-50 MHz band-pass filter; the first partial discharge PD channel is connected with an output end of the measuring impedance; the first voltage V channel is connected with the output end of the direct current voltage divider.
Preferably, the signal junction box comprises a partial discharge second PD channel and a second voltage V channel; the second PD channel is connected with the output end of the measuring impedance; and the second voltage V channel is connected with the output end of the direct current voltage divider.
Compared with the prior art, the utility model discloses following beneficial effect has:
the result reliability is high: the test device in the utility model simulates the application working condition of the direct current PD ultra wide band detection system under the actual condition, and verifies the reliability and stability of the direct current PD ultra wide band detection system by setting a contrast test; meanwhile, the position of the discharge electrode is skillfully designed by the testing device, the corona working condition in the air existing in the discharge and voltage withstand test in the transformer oil is simulated, comprehensive examination is provided for the research and development of the direct current PD ultra-wide band detection system to carry out test verification, and the reliability of the verification result is further improved.
Drawings
FIG. 1 is a schematic diagram of a circuit structure of a current conversion to DC withstand voltage PD test in the prior art;
FIG. 2 is a schematic structural view of a test apparatus of the present invention;
fig. 3 is a schematic structural diagram of a high voltage dc generator according to the present invention;
fig. 4 is a schematic diagram of an equivalent circuit structure of a high voltage branch flow generator according to the present invention;
FIG. 5 is a schematic structural diagram of a tip discharge model Cx1 in oil according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an example Cx2 of an in-air corona discharge model in an embodiment of the present invention;
FIG. 7 is a schematic diagram of an equivalent circuit of a sample Cx1 of a point discharge model in oil according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of an equivalent circuit of the sample Cx2 of the corona discharge model in air according to an embodiment of the present invention;
fig. 9 is a waveform diagram obtained by a first application case pulse-time series ultra-wideband detection system in an embodiment of the present invention;
fig. 10 is a schematic diagram of a peak sequence corresponding to a pulse waveform-time sequence acquired by a first application case pulse-time sequence ultra-wideband detection system according to an embodiment of the present invention;
fig. 11 is a waveform diagram obtained by the dc PD ultra wide band detection system according to the embodiment of the present invention;
fig. 12 is a schematic diagram of a peak sequence corresponding to a pulse waveform-time sequence acquired by the dc PD ultra-wideband detection system according to the embodiment of the present invention;
fig. 13 is a waveform diagram obtained by a second application case pulse-time series ultra-wideband detection system in an embodiment of the present invention;
fig. 14 is a schematic diagram of a peak sequence corresponding to a pulse waveform-time sequence obtained by the pulse-time sequence ultra-wideband detection system according to the second embodiment of the present invention;
fig. 15 is a waveform diagram obtained by the dc PD ultra wide band detection system according to the second embodiment of the present invention;
fig. 16 is a schematic diagram of a peak sequence corresponding to a pulse waveform-time sequence obtained by the direct current PD ultra-wideband detection system according to the second application case of the embodiment of the present invention.
The reference numbers in the figures indicate:
1. the device comprises a voltage regulator, 2, a high-voltage direct-current generator, 3, a water resistor, 4, a direct-current voltage divider, 5, a coupling capacitor, 6, a double-loop switching switch, 7, a test article, 8, a measurement impedance, 9, a data acquisition module, 10, an industrial personal computer, 11, a signal connector box, 12 and a terminal.
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 some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.
An experimental device for verifying a direct current PD ultra-wideband detection system, which is structurally shown in fig. 2, includes: the device comprises a voltage regulator 1, a high-voltage direct current generator 2, a water resistor 3, a direct current voltage divider 4, a coupling capacitor 5, a double-loop fling-cut switch 6, a test article 7, a measurement impedance 8, a data acquisition module 9, an industrial personal computer 10, a signal connector box 11 and a terminal 12.
The input end of the voltage regulator 1 is connected with 220V alternating current, and the output end of the voltage regulator is connected with the input end of the high-voltage direct current generator 2. The output end of the high-voltage direct current generator 2 is connected with a water resistor 3. The water resistor 3 is connected in series with a dc voltage divider 4.
The double-loop fling-cut switch 6, the test article 7 and the measuring impedance 8 are connected in series. A series circuit consisting of the double-loop fling-cut switch 6, the test article 7 and the measuring impedance 8 is connected in parallel with the coupling capacitor 5. A parallel connection circuit consisting of a double-loop fling-cut switch 6, a test article 7, a measuring impedance 8 and a coupling capacitor 5 is connected to a circuit between the water resistor 3 and the direct-current voltage divider 4.
The input end of the data acquisition module 9 is respectively connected with the direct current voltage divider 4 and the measuring impedance 8. The output end of the data acquisition module 9 is connected with an industrial personal computer 10.
The input end of the signal connector box 11 is respectively connected with the direct current voltage divider 4 and the measuring impedance 8, and the output end is connected with the terminal 12.
The above modules are described in detail below:
pressure regulator 1
The single-phase voltage regulator is a single-phase 0-400V voltage regulator, and utilizes the 220V alternating current of a public network to output 0-400V single-phase voltage regulation through a single-phase isolation transformer to serve as a voltage regulation device of a high-voltage direct current generator 2.
Second, high voltage DC generator 2
The schematic structural diagram 3 is shown in fig. 3 and 4, and includes four secondary side windings L1、L2、L3And L4Two full wave bridge rectifier silicon stacks D1And D2A filter capacitor C, a load R, four secondary side windings L1、L2、L3And L4Are respectively arranged corresponding to the primary side winding and the secondary side winding L of the voltage regulator 11And L2Series connected full wave bridge type rectifying silicon stack D1Secondary side winding L3And L4Series connected full wave bridge type rectifying silicon stack D2Power supply terminal of, full wave bridge rectifier silicon stack D2The negative end of the output end of the rectifier is grounded, the positive end of the output end of the rectifier is connected with a full-wave bridge rectifier silicon stack D1Is connected with the negative end of the output end, and a full-wave bridge type rectifier silicon stack D1The positive end of the output end of the load is connected with the filter capacitor C, the other end of the filter capacitor is grounded, and the load R is connected with the filter capacitor C in parallel. After the voltage is rectified, the voltage is changed into direct current high voltage of 0-100 kV through a filter capacitor C and is applied to a load R.
Third, water resistance 3
Hydroelectric group R in the present examplezThe organic glass tube plugged by the insulating oak plug is filled with deionized water to a certain degree, and a resistor consisting of guide wires is arranged at two ends of the organic glass tube, the resistance value is 100k omega, and the organic glass tube is used for preventing overcurrent after insulation breakdown inside a test sample.
Four, DC voltage divider 4
A common resistance voltage-dividing type direct current voltage divider is selected, and the measuring range of the voltage-dividing type direct current voltage divider is matched with the high-voltage direct current generator 2 to output 0-100 kV.
Fifth, coupling capacitor 5
Coupling capacitor C in the present embodimentkA common 100kV non-partial discharge coupling capacitor for a PD test is selected, and the capacitance value is 100 pF.
Six, double-loop fling-cut switch 6
No power and coupling capacitor C throughout the test loopkAnd the device is hung on the ground rod, so that the two test articles can be independently put in or withdrawn.
Seventh, sample 7
The sample 7 in this example includes a tip discharge in oil model sample Cx1 and a corona discharge in air model sample Cx2, the structures and equivalent circuits of which are shown in fig. 5, 6, 7, and 8, respectively.
The principle of judging the PD pulse current polarity of Cx1 and Cx2 samples under HVDC (negative polarity) is as follows: cx1 sample simulates PD and coupling capacitance C generated insidekCharging Cx1 rapidly, wherein the pulse current waveform obtained by measuring impedance under negative-polarity direct-current voltage has negative polarity; cx2 sample simulates external discharge corona condition due to coupling capacitance CkAnd the sample capacitance Cx2 are simultaneously transferred to the stray capacitance CsAnd (3) quick charging, so that a pulse current waveform obtained by measuring impedance under negative direct current voltage has positive polarity, the positive polarity is used as a corona discharge working condition existing under an actual withstand voltage test, and a contrast test verifies the working reliability and stability of the connected pulse-time sequence ultra-wideband detection system under the field actual working condition.
Eighth, measure impedance 8
Comprising a voltage protector P and a non-inductive resistor RdVoltage protector P and non-inductive resistor RdParallel connected, non-inductive resistor RdThe resistance value of the probe is 50 omega, the detection sensitivity is 0.5pC, and the detection bandwidth of 3dB is 10 kHz-50 MHz.
Nine, data acquisition module 9
The device comprises a first partial discharge PD channel and a first voltage V channel, wherein the front end of the first PD channel is connected with a 100 kHz-50 MHz band-pass filter, and the first partial discharge PD channel is connected with the output end of a measuring impedance 8; the first voltage V channel is connected to the output of the dc voltage divider 4.
The data acquisition module 9 is specifically designed as follows:
(1) the device comprises two measurement channels of PD and voltage V;
(2) the front end of the PD channel is connected with a 10 kHz-50 MHz band-pass filter to filter power frequency interference and useless high-frequency signals, the input impedance is 50 omega, and the input impedance is well matched with a signal transmission cable;
(3) the V channel is connected with a low-voltage signal of the direct-current voltage divider, and the input impedance is 1 MOmega;
(4) the PD channel sampling rate is 100MS/s, the acquisition length can be artificially set to 100 points, 200 points and … 5000 points, the acquisition lengths of the acquisition lengths correspond to pulse recording time lengths of 1-5 mu s respectively, and the acquisition lengths are used for adapting to pulse current waveforms with different lengths;
(5) the PD channel is a trigger channel, and the trigger type (rising edge or falling edge) is set according to the polarity of the direct current voltage (when the sensor is connected with a test article in series, the trigger type is the same as the polarity of the direct current voltage, and when the sensor is connected with the coupling capacitor in series, the trigger type is opposite to the polarity of the direct current voltage);
(6) the triggering threshold is the minimum peak value of the collected PD current pulse waveform.
Two specific application cases are provided below:
the first application case:
under 36kV, waveforms obtained by the pulse-time sequence ultra-wideband detection system and the direct current PD ultra-wideband detection system are respectively shown in fig. 9 and fig. 11, and finally peak sequences corresponding to the pulse waveform-time sequences obtained by the two systems are respectively shown in fig. 10 and fig. 12.
The second application case:
under 17kV, waveforms obtained by the pulse-time sequence ultra-wideband detection system and the direct current PD ultra-wideband detection system are respectively shown in fig. 13 and fig. 15, and finally peak sequences corresponding to the pulse waveform-time sequences obtained by the two systems are respectively shown in fig. 14 and fig. 16.
Although the oscillograms obtained by the pulse-time sequence ultra-wideband detection system in the two application cases are influenced by the performance difference of the pre-filtering, the peak-time sequence has a certain difference, but the detection result of the direct current PD ultra-wideband detection system is not greatly different from the detection result of the pulse-time sequence ultra-wideband detection system.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022785293.2U CN214097754U (en) | 2020-11-27 | 2020-11-27 | A test device for verifying DC PD ultra-wideband detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022785293.2U CN214097754U (en) | 2020-11-27 | 2020-11-27 | A test device for verifying DC PD ultra-wideband detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214097754U true CN214097754U (en) | 2021-08-31 |
Family
ID=77453156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022785293.2U Active CN214097754U (en) | 2020-11-27 | 2020-11-27 | A test device for verifying DC PD ultra-wideband detection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214097754U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557984A (en) * | 2020-11-27 | 2021-03-26 | 国网上海市电力公司 | Test device for verifying direct current PD ultra-wide band detection system |
| CN115208211A (en) * | 2022-06-29 | 2022-10-18 | 西安电子科技大学 | Forward self-biased full-wave rectification circuit |
-
2020
- 2020-11-27 CN CN202022785293.2U patent/CN214097754U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557984A (en) * | 2020-11-27 | 2021-03-26 | 国网上海市电力公司 | Test device for verifying direct current PD ultra-wide band detection system |
| CN115208211A (en) * | 2022-06-29 | 2022-10-18 | 西安电子科技大学 | Forward self-biased full-wave rectification circuit |
| CN115208211B (en) * | 2022-06-29 | 2024-04-16 | 西安电子科技大学 | Forward self-biased full-wave rectifying circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206671472U (en) | High-tension cable local discharge detection device | |
| CN110346688B (en) | Method for rapidly judging and positioning faults of high-voltage complex cables of 110kV or above in segmented manner | |
| CN105137292B (en) | Direct current signal intelligent acquisition device for high-tension cable fault location | |
| CN108646144A (en) | A kind of offline distance measuring method of high voltage single-core cable short trouble, apparatus and system | |
| CN101666826B (en) | Overvoltage online monitoring device based on dual time base sampling technology | |
| CN202870244U (en) | Testing apparatus for asymmetric voltage applying of converter valve | |
| CN103926514A (en) | Insulation diagnostic method for high-voltage equipment in charged operating state | |
| CN101551432A (en) | Power distribution network fault positioning method | |
| CN109406907A (en) | High-impedance transformer simulates on-load through-flow test device and test method | |
| CN104777420B (en) | The test system and its test method of a kind of high-voltage switch contact | |
| CN214097754U (en) | A test device for verifying DC PD ultra-wideband detection system | |
| CN202837477U (en) | Cable defect simulation test device | |
| CN108872771A (en) | A kind of transformer preventive trial equivalent method | |
| CN104142421A (en) | Substation equipment insulation online monitoring system and working method thereof | |
| CN114487734B (en) | Short-time alternating-current transmission cable line insulation integrated comprehensive test device and method | |
| CN102944810B (en) | Test device for secondary circuit zero line site of voltage transformer | |
| CN112557984A (en) | Test device for verifying direct current PD ultra-wide band detection system | |
| CN204241625U (en) | A kind of withstand voltage distance measuring equipment exchanged based on ultralow frequency | |
| CN110376541A (en) | A method of test electronic mutual inductor wideband transmission characteristic | |
| CN204359883U (en) | A kind of transformer multifunctional tester | |
| CN107479016A (en) | A kind of flexible direct current power network direct current high-speed measuring device method for testing performance and system | |
| CN207730890U (en) | Integrated detection device for medium loss and partial discharge of wind driven generator | |
| CN218546873U (en) | Insulation resistance tester based on capacitance partial pressure restraines induced voltage | |
| CN208443966U (en) | A kind of partial discharge of switchgear detection device | |
| CN110645887A (en) | Winding deformation judgment method based on short-circuit reactance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |