CN106053898A - High-frequency partial discharge equivalent signal source - Google Patents
High-frequency partial discharge equivalent signal source Download PDFInfo
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- CN106053898A CN106053898A CN201610402826.XA CN201610402826A CN106053898A CN 106053898 A CN106053898 A CN 106053898A CN 201610402826 A CN201610402826 A CN 201610402826A CN 106053898 A CN106053898 A CN 106053898A
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- signal
- high frequency
- outfan
- base
- frequency partial
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a high-frequency partial discharge equivalent signal source, which is characterized in that the high-frequency partial discharge equivalent signal source comprises a logic control and digital signal generation module, which is used for generating a partial discharge digital signal and transmitting the partial discharge digital signal to a high-frequency analog signal generation module, and generating a time-base signal and transmitting the time-base signal to a time-base signal synchronization module; the high-frequency analog signal generation module, which is used for converting the partial discharge digital signal into a partial discharge analog signal and transmitting the partial discharge analog signal to a signal conditioning module; the signal conditioning module, which is used for carrying out programmable amplification on the partial discharge analog signal and converting the processed partial discharge analog signal into a charge signal and transmitting the charge signal to an output interface; the time-base signal synchronization module, which is used for receiving the time-base signal, converting the time-base signal into a time-base synchronization signal and outputting the time-base synchronization signal to the output interface; and the output interface, which is used for outputting the charge signal and the time-base synchronization signal.
Description
Technical field
The invention belongs to microelectric technique and technical field of power signal detection, particularly relate to a kind of high frequency partial electric discharge etc.
Effect signal source.
Background technology
Shelf depreciation generally refers to a kind of physical phenomenon produced in high voltage electric equipment.Electric Power Equipment Insulation is enough
The electric discharge occurred in subrange under strong electric field action.This electric discharge with only cause between conductor insulation local short (road and bridge) connect
And be formed without conductive channel and be limited.Dielectric all can be had some to affect by shelf depreciation each time, slight shelf depreciation pair
The impact of Electric Power Equipment Insulation is less, and the decline of dielectric strength is slower；And strong shelf depreciation, then can make dielectric strength quickly
Decline.This is the key factor making the apparatus insulated damage of high-tension electricity.
Shelf depreciation plays a kind of corrosion function to insulation system, and it has the following aspects to the failure mechanism of insulation:
1. charged particle (electronics, ion etc.) impact insulation, destroys its molecular structure, and such as fiber fragmentation, thus insulation sustains damage；②
Due to the effect of impact of charged ion, make this insulation occur that local temperature raises, thus easily cause the overheated of insulation, time serious just
There will be carbonization；3. shelf depreciation produces ozone (O3) and nitrogen oxide (NO, NO2) can corrode insulation, when meeting moisture
Then producing nitric acid, the erosion to insulation is the most violent；4., when shelf depreciation, oil is because of electrolysis and the Schottky radiation effect of electrode
Make oil decomposition, add the Central Plains that oils there is a little impurity, therefore how the greasy filth easily making coagulation at ply of paper because of polymerization to generate is (at circle
At the oil film wedge of insulation or other insulation), greasy filth generates and is increased sharply at the dielectric damages angle making insulation, and heat-sinking capability reduces, and even leads
The probability that pyrogenicity punctures.The sustainable development of shelf depreciation can make the deterioration damage of insulation progressively expand, and finally makes insulation normal
The lost of life, in short-term dielectric strength reduce, in some instances it may even be possible to make whole insulation breakdown.Eventually high-voltage electrical equipment is caused seriously
Damage, even cause serious accident.
The relevant criterion of country has been directed towards high-voltage electrical equipment and has formulated enforceable partial discharge monitoring.Shelf depreciation
The existing substantial amounts of instrumentation of monitoring can apply.But the monitoring of high frequency partial discharge signal, still has and much needs solution badly
Problem.A most critically important problem, high frequency partial discharge signal cannot be simulated by classical signal source, thus lead
Cause test instrunment also cannot demarcate accurately and verify.
Summary of the invention
It is an object of the invention to: provide a kind of high frequency partial electric discharge dummy source, for putting monitor for high frequency office
Device provides the local discharge signal of multiple standards, for the base that the standardized production of partial discharge monitoring equipment is important with demarcating offer
Plinth ensures.
The technical solution used in the present invention is as follows: a kind of high frequency partial electric discharge dummy source, including: logic control and number
Word signal generation module: generation shelf depreciation digital data transmission is to high frequency analog signals generation module, and generates time-base signal
It is transferred to time-base signal synchronization module；High frequency analog signals generation module: i.e. DAC chip application circuit, by shelf depreciation numeral
Signal is converted to shelf depreciation analogue signal and is transmitted to Signal-regulated kinase；Signal-regulated kinase: to shelf depreciation mould
Intend signal carry out programming amplifying and be translated into charge signal and be transferred to output interface；Time-base signal synchronization module: during reception
Base synchronizing signal be transported to output interface when base signal is converted to；Output interface: output charge signal and Shi Ji synchronizing signal.
Further, with digital signal generation module, logic control includes that FPGA with FPGA is connected E2PROM and SRAM；
E2PROM is systematic parameter memory area, and low-power consumption SRAM is system cache.
Logic control is made up of the element such as large-scale F PGA and memorizer with digital signal generation module, internal operation NIOS
Embedded program and corresponding sequential logic.Complete the shelf depreciation digital signal built based on multiple mathematical model.These
Data export high frequency analog signals generation module, are converted to analog voltage signal, then output is adjusted to Signal-regulated kinase, signal
Reason module completes the programming amplifying of signal and voltage to the conversion of charge signal, and finally, charge signal is transported to output interface.
It addition, the time base needed for logic control coordinates time-base signal synchronization module to produce rear end equipment with digital signal generation module is same
Step signal, and it is transported to output interface.
Local discharge signal has polytype, be typically include noble gas discharge, oil clearance electric discharge, the air gap electric discharge,
Epoxy medium discharge etc..Different types, its parameter such as amplitude, frequency is different.Calculated by binding isotherm, constructed many
Plant the mathematical model of Partial discharge signal.Select corresponding shelf depreciation kind, set concrete parameter.
Further, FPGA uses CycloneIV.FPGA is mainly responsible for DAC waveform and generates, in view of examining of cost and performance
Consider, select Cyclone IV FPGA to have only to two-way power supply and power, simplify power distribution network, reduce circuit board cost, subtract
Little board area, shortens the design time.
Further, logic control and digital signal generation module are also associated with USB module, and USB module uses CYPRESS
EZ-USB FX3 chip.User can be by upper computer software program control FPGA output digit signals to DAC CYPRESS EZ-USB
FX3 is a new generation's USB3.0 peripheral control unit, has highly integrated flexible nature, and can help developer is any system
Add USB 3.0 function.EZ-USB FX3 has a parallel general programmable interface GPIF that can configure completely
II, it can be connected with any processor, ASIC or FPGA.It can the most seamlessly be connected to multiple common interfaces, the most different
Step SRAM, asynchronous and synchronous address date multiplexing type interface, Parallel ATA etc..
Further, Signal-regulated kinase includes: zero point and gain compensation circuit and filter circuit.
Further, zero point and gain compensation circuit structure are that integrated transporting discharging U1 positive input terminal is by resistance R5 ground connection, U1
Negative input end and outfan between connected by resistance R4, the negative input end of U1 connects resistance R1, R2 and R3, resistance R1, R2,
The other end of R3 is as three inputs of circuit, and the outfan of integrated transporting discharging U1 is as circuit output end.
Further, filter circuit construction is: the positive input terminal of integrated transporting discharging U2 connects its outfan, the negative input end of U2
By electric capacity C3 ground connection, the negative input end of U2 is sequentially connected with resistance R7 and R6 to be passed through to input, the node between resistance R6 and R7
The outfan of the outfan integrated transporting discharging U2 that electric capacity C1 is connected to U2 is connected to the negative input end of integrated transporting discharging U3, integrated transporting discharging U3
Negative input end by electric capacity C4 ground connection, the negative input end of U3 is connected by electric capacity C2 and U3 outfan, the positive input terminal company of U3
Connect its outfan outfan as filter circuit.
Further, outfan and the input of Signal-regulated kinase is exported by buffer and input signal respectively.When
After the buffered device of analogue signal of DAC output, need signal condition and filtering, in order to improve the signal product when final output
Matter.
Further, logic control is also connected with zero point and gain compensation circuit with digital signal generation module, it is simple to right
The control of signal condition.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1, digitized generation multiple high frequency partial discharge signal, its cycle, amplitude, rising fall time, persistent period etc. ginseng
The program-controlled regulation of number, the program-controlled selection of kind of discharging.
2, provide the time-base signal Tong Bu with Bureau of Standards discharge signal according to cycle of Partial discharge signal, make for monitoring device
With.
3, based on the present invention, the office originally should not demarcated can be made to put monitor the calibrating of standard, method of testing, makes height
More accurately and reliably, the safe operation of electrical equipment of attaching most importance to provides safeguard the partial discharge test of voltage electrical equipment.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is principle of the invention figure；
Fig. 2 is high-frequency signal generating principle figure of the present invention；
Fig. 3 is hardware block diagram of the present invention；
Fig. 4 is zero point of the present invention and gain compensation circuit figure；
Fig. 5 is filter circuit figure of the present invention.
Detailed description of the invention
All features disclosed in this specification, or disclosed all methods or during step, except mutually exclusive
Feature and/or step beyond, all can combine by any way.
Below in conjunction with Fig. 1, Fig. 2, the present invention is elaborated.
Embodiment
A kind of high frequency partial electric discharge dummy source, including: logic control and digital signal generation module: generate local and put
Electricity digital data transmission is to high frequency analog signals generation module, and generates time-base signal and be transferred to time-base signal synchronization module；High
Frequently analogue signal generation module: shelf depreciation digital signal is converted to shelf depreciation analogue signal and is transmitted to signal tune
Reason module；Signal-regulated kinase: local Discharge Simulation signal is carried out programming amplifying and is translated into charge signal and is transferred to
Output interface；Time-base signal synchronization module: receive time-base signal base synchronizing signal be transported to output interface when being converted to；Output
Interface: output charge signal and Shi Ji synchronizing signal.With digital signal generation module, logic control includes that FPGA with FPGA is connected
E2PROM and SRAM.FPGA uses CycloneIV, E2PROM as systematic parameter memory area, and low-power consumption SRAM is that system is delayed
Deposit.
Logic control and digital signal generation module are also associated with USB module, and USB module uses CYPRESS EZ-USB
FX3 chip.
Signal-regulated kinase includes: zero point and gain compensation circuit and filter circuit.Zero point and gain compensation circuit structure
For integrated transporting discharging U1 positive input terminal by resistance R5 ground connection, connected by resistance R4 between negative input end and the outfan of U1, U1
Negative input end connect resistance R1, R2 and R3, the other end of resistance R1, R2, R3 is as three inputs of circuit, integrated transporting discharging
The outfan of U1 is as circuit output end.Filter circuit construction is: the positive input terminal of integrated transporting discharging U2 connects its outfan, U2's
Negative input end passes through electric capacity C3 ground connection, and the negative input end of U2 is sequentially connected with resistance R7 and R6 to input, between resistance R6 and R7
The outfan of the outfan integrated transporting discharging U2 that node is connected to U2 by electric capacity C1 is connected to the negative input end of integrated transporting discharging U3, collection
The negative input end becoming amplifier U3 is connected by electric capacity C2 and U3 outfan by electric capacity C4 ground connection, the negative input end of U3, and U3 is just
Input connects its outfan outfan as filter circuit.
DAC chip in high frequency analog signals generation module uses the AD768 of ADI
The outfan of Signal-regulated kinase and input are exported and input signal by single buffer respectively.Logic control with
Digital signal generation module is also connected with zero point and gain compensation circuit.
Signal source power supply uses external direct current power supply to power (DC:15V), and the electricity consumption of digital circuit is turned by DC/DC
Directly use after changing；The electricity consumption of analog portion, first passes through DC/DC conversion again by using after LDO noise reduction, in order to reduce power supply and make an uproar
Sound, improves the signal to noise ratio of system.
Simultaneously in order to obtain the accurate quantity of electric charge, need to use accurate voltage-electric charge modular converter, for preventing electric charge from letting out
Dew, inside modules capacitance needs to use polystyrene film dielectric capacitor, this electric capacity have nonpolarity, frequency response wide,
Capacitance stability is good, insulation resistance advantages of higher, and in like manner substrate is also required to use the ceramic pcb board of low-k to be base
Plate；For reducing external interference, all switches in module are both needed to use magnetism holding type relay, and the relay of the type has volume
Little, contact resistance is little, stable performance, contact resistance be less than 0.1 ohm, insulation resistance be more than 100G ohm；Separately, module also needs to adopt
Make full-shield with shielding box to process.
Claims (9)
1. a high frequency partial electric discharge dummy source, it is characterised in that including:
Logic control and digital signal generation module: generate shelf depreciation digital data transmission to high frequency analog signals generation mould
Block, and generate time-base signal and be transferred to time-base signal synchronization module；
High frequency analog signals generation module: shelf depreciation digital signal is converted to shelf depreciation analogue signal and is transmitted to
Signal-regulated kinase；
Signal-regulated kinase: local Discharge Simulation signal is carried out programming amplifying and be translated into charge signal be transferred to output
Interface；
Time-base signal synchronization module: receive time-base signal base synchronizing signal be transported to output interface when being converted to；
Output interface: output charge signal and Shi Ji synchronizing signal.
A kind of high frequency partial electric discharge dummy source the most according to claim 1, it is characterised in that described logic control with
Digital signal generation module includes that FPGA with FPGA is connected E2PROM and SRAM.
A kind of high frequency partial electric discharge dummy source the most according to claim 2, it is characterised in that described FPGA uses
CycloneIV。
A kind of high frequency partial electric discharge dummy source the most according to claim 2, it is characterised in that described logic control with
Digital signal generation module is also associated with USB module, and USB module uses CYPRESS EZ-USB FX3 chip.
A kind of high frequency partial electric discharge dummy source the most according to claim 1, it is characterised in that described signal condition mould
Block includes: zero point and gain compensation circuit and filter circuit.
A kind of high frequency partial electric discharge dummy source the most according to claim 5, it is characterised in that described zero point and gain
Compensating circuit structure is that integrated transporting discharging U1 positive input terminal passes through resistance R5 ground connection, by electricity between negative input end and the outfan of U1
Resistance R4 connects, and the negative input end of U1 connects resistance R1, R2 and R3, and the other end of resistance R1, R2, R3 is as three inputs of circuit
End, the outfan of integrated transporting discharging U1 is as circuit output end.
A kind of high frequency partial electric discharge dummy source the most according to claim 5, it is characterised in that described filter circuit is tied
Structure is: the positive input terminal of integrated transporting discharging U2 connects its outfan, and the negative input end of U2 passes through electric capacity C3 ground connection, the negative input end of U2
It is sequentially connected with resistance R7 and R6 and is connected to the integrated fortune of outfan of U2 to input, the node between resistance R6 and R7 by electric capacity C1
The outfan putting U2 is connected to the negative input end of integrated transporting discharging U3, and the negative input end of integrated transporting discharging U3 passes through electric capacity C4 ground connection, U3
Negative input end be connected by electric capacity C2 and U3 outfan, the positive input terminal of U3 connects the output as filter circuit of its outfan
End.
A kind of high frequency partial electric discharge dummy source the most according to claim 5, it is characterised in that described signal condition mould
The outfan of block and input are exported and input signal by single buffer respectively.
A kind of high frequency partial electric discharge dummy source the most according to claim 5, it is characterised in that described logic control with
Digital signal generation module is also connected with zero point and gain compensation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610402826.XA CN106053898A (en) | 2016-06-12 | 2016-06-12 | High-frequency partial discharge equivalent signal source |
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| CN201610402826.XA CN106053898A (en) | 2016-06-12 | 2016-06-12 | High-frequency partial discharge equivalent signal source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111596188A (en) * | 2020-05-28 | 2020-08-28 | 南京华乘电气科技有限公司 | Signal generator simulation device and high-frequency current partial discharge signal simulation method |
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| CN105510860A (en) * | 2016-01-28 | 2016-04-20 | 云南电网有限责任公司电力科学研究院 | Power frequency synchronization digital embedded partial discharge detector calibration system |
| CN205212789U (en) * | 2015-12-14 | 2016-05-04 | 湖南工业大学 | Broadband dc amplifier based on S3C2440 |
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2016
- 2016-06-12 CN CN201610402826.XA patent/CN106053898A/en active Pending
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| CN103197256A (en) * | 2013-04-07 | 2013-07-10 | 吉林大学 | State of charge (SOC) estimation method of lithium ion battery |
| CN205212789U (en) * | 2015-12-14 | 2016-05-04 | 湖南工业大学 | Broadband dc amplifier based on S3C2440 |
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| CN111596188A (en) * | 2020-05-28 | 2020-08-28 | 南京华乘电气科技有限公司 | Signal generator simulation device and high-frequency current partial discharge signal simulation method |
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Application publication date: 20161026 |