CN203204080U - Bushing dielectric loss on-line monitoring device based on B code timing - Google Patents
Bushing dielectric loss on-line monitoring device based on B code timing Download PDFInfo
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- CN203204080U CN203204080U CN 201320128819 CN201320128819U CN203204080U CN 203204080 U CN203204080 U CN 203204080U CN 201320128819 CN201320128819 CN 201320128819 CN 201320128819 U CN201320128819 U CN 201320128819U CN 203204080 U CN203204080 U CN 203204080U
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- 238000004080 punching Methods 0.000 claims description 12
- 238000012423 maintenance Methods 0.000 abstract description 11
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
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- 238000006243 chemical reaction Methods 0.000 description 2
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- 201000004569 Blindness Diseases 0.000 description 1
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Abstract
The utility model discloses a bushing dielectric loss on-line monitoring device based on B code timing. The device truly reflects the insulation condition of a transformer bushing in operation by carrying out real-time, long-term and on-line monitoring on the dielectric loss of the transformer bushing in a substation and has the advantages of good stability, repeatability, high precision, high reliability, convenient maintenance and the like. The device comprises a microprocessor module, a signal selection module, a programmable amplifier module and an A/D converter module, wherein the signal selection module, the programmable amplifier module and the A/D converter module are sequentially connected. The A/D converter module is connected with the microprocessor module through a sampling logic module. The microprocessor module is connected with a B code synchronization module and an RS485 bus. The RS485 bus is connected with a bushing monitoring IED unit.
Description
Technical field
The utility model relates to a kind of sleeve pipe dielectric loss on-line monitoring device, be specifically related to a kind of based on the B sign indicating number to the time sleeve pipe dielectric loss on-line monitoring device.Belong to the power transmission and transforming equipment monitoring technical field.
Background technology
The transforming plant main transformer depressor is the major equipment of electric system, and its reliability of operation is directly connected to the safety of electric system and the reliability of power supply, in case lost efficacy the loss that causes or influence huge.Sleeve pipe is the important component part in the transformer, and certain studies show that the sleeve pipe fault accounts for 40% of transformer fault, also has data to show that 52% sleeve pipe fault is very serious even initiation fire.Therefore, condenser bushing is carried out the dielectric loss Study on Online Monitoring and have very high theory significance and engineering using value.China is since the fifties in last century, and main regulation according to " electrical equipment preventive test rules " is carried out regular power failure test, maintenance to electrical equipment and safeguarded, seriously makes moist in a large number and has the equipment of open defect to be examined out.But because this interruption maintenance and test are regularly to carry out, be difficult in time reflect the insulation latency fault of device interior, has certain blindness, also caused simultaneously the waste of a large amount of manpower and materials, and trial voltage often will be lower than working voltage, therefore its equivalence is relatively poor relatively, and is sensitive inadequately to some defective reflection, can not adapt to safety, economy, the stable operation demand of electrical network fully.Therefore, progressively replacing time-based maintenance mode based on the maintenance mode of state is the inexorable trend of power system device maintenance development.And the precondition that realizes the maintenance of electrical equipment state is the application of its insulated on-line monitoring and fault diagnosis technology.But the early stage actual system that puts into operation adopts distributed structure mostly, and operational effect is unsatisfactory, and the problem that reflects mainly contains:
1) measurement stability and the poor repeatability of dielectric loss angle;
2) ability of the anti-electromagnetic interference (EMI) of current sensor and stability against atmospheric influence easily lost efficacy;
3) existing safe operation on-line monitoring system adopts centralized configuration mostly, be about to all measured signals and collect in a place, measured one by one by main frame, that just often says patrols and examines metering system, exist: 1. the long Distance Transmission of tested simulating signal is disturbed by power frequency magnetic field, influences measurement data accuracy or stability; 2. can't judge the true insulation status of equipment under test; 3. operational reliability is poor, the failure rate height; 4. on-the-spot the need laid a large amount of cables, and be great in constructing amount, causes maintenance, expansion inconvenience.
Summary of the invention
The purpose of this utility model is for overcoming above-mentioned the deficiencies in the prior art, provide a kind of based on the B sign indicating number to the time sleeve pipe dielectric loss on-line monitoring device.Reflect the insulation status of bushing shell for transformer in service to have good stability truly by the dielectric loss of bushing shell for transformer in real-time, the long-term on-line monitoring transformer station, repeatability, advantage such as precision is high, reliability is high, and is easy to maintenance.
For achieving the above object, the utility model adopts following technical proposals:
A kind of based on the B sign indicating number to the time sleeve pipe dielectric loss on-line monitoring device, it comprises microprocessor module and the signal selection module, programmable amplifier module and the A/D converter module that connect successively; Described A/D converter module is connected to microprocessor module by the sampling logic module; Described microprocessor module is connected with B sign indicating number synchronization module and RS485 bus, and described RS485 bus is connected with casing monitoring IED unit.
Described microprocessor module also is connected with the reset circuit module.
Described programmable amplifier module is connected with the signal condition module, and described signal condition module is connected to microprocessor module by the frequency measurement logic module.
The input end of described signal selection module is connected with collection PT secondary voltage voltage of signals sensor assembly with the punching current transformer module respectively.
Described punching current transformer module is BCT-2 type electromagnetic type punching small electric current sensor.
Described microprocessor module is NisoII series flush bonding processor, and it is embedded into C
yOn the clone series EP2C5T144C8N fpga chip.
Described programmable amplifier module is programmable gain instrument amplifier PGA204.
Described RS485 bus adopts the ADM2483 chip.
Principle of work of the present utility model:
The utility model adopts core-theaded type zero flux current sensor technology, the drift that compensates is brought to measurement; Adopt the Fourier analysis method of FPGA and high-precision A/D synchronous sampling technique and optimization, try to achieve amplitude, phase place and phase differential etc., and then obtain electric parameters such as required dielectric loss, leakage current, equivalent capacitance; Adopt B sign indicating number technology to carry out each monitoring device and carry out synchronized sampling, improved the measuring accuracy of system.
The utility model adopts harmonic analysis method, it is the current signal of measuring PT secondary side voltage signal and the sleeve pipe of flowing through by sensor device, again the simulating signal that obtains is converted into digital signal, adopt the method for digital spectrum analysis to obtain the first-harmonic of these two signals then, and then by fundamental phase relatively obtained dielectric loss tan δ.Be actually and carry out the fourier series decomposition to flowing through apparatus insulated current i (t), its expression formula is:
ω in the formula=2 π f, f is mains frequency; I
0DC component for electric current; I
kBe respectively the each harmonic amplitude of electric current;
Be respectively the each harmonic initial phase angle of electric current, k is positive integer.
The dielectric dissipation factor of sleeve pipe is:
Wherein,
With
Be respectively the first-harmonic initial phase angle of voltage and current.Hence one can see that, and the key of finding the solution condenser bushing equipment dielectric loss factor just is to remove the influence that system harmonics disturbs, and tries to achieve the initial phase angle of i (t) exactly.The i (t) that considers actual acquisition is the discrete periodic sequence through the finite length after dispersing, quantizing, suppose to represent discrete point (0≤n≤N-1 that sampling obtains with x (n), N is the total length of sequence, total sampling number corresponding to discrete waveform), can get after discrete Fourier transform (DFT) with x (n):
By following formula as can be known:
In the formula, X
R(k), X
I(k) be respectively real part and the imaginary part of X (k), j is the imaginary part of plural number.
According to following formula as can be seen, sequence x (n) is the initial phase angle of i (t)
For:
Obtain the initial phase angle of two signals respectively by following formula, and then ask for relative dielectric dissipation factor tan δ according to formula (1-2).
The beneficial effects of the utility model:
1, selects for use the very high fpga chip of collection progress as the processor of system, used the C of altera corp
yClone family chip EP2C5T144C8N is as the FPGA device.Its embedded NisoII series flush bonding processor had both satisfied the designing requirement of high-acruracy survey, had improved the integrated level of system, also made processor have distinctive dirigibility and customizability.NisoII obtains humiture information as microprocessor, realizes the real-time sampling control of A/D converter module and the measurement of signal frequency, and finishes the functions such as buffering, processing, transmission of data.The peripheral hardware of the NisoII system that FPGA is embedded has configurability, the user can come cutting according to practical application, and the NisoII processor has good custom instruction support, and most of instruction all can be finished in a clock period, and this also is the advantage place of configurable processor.The NisoII soft nucleus CPU is programmable system on chip SOPC (S
yStem On Programmable Chip), be 32 reduced instruction set computer CPU in logic function, and on implementation, it is realized by programming mode on FPGA, but the therefore SOPC system combined with hardware steering logic centralized procurement sample control of setting up based on FPGA, processing, buffer memory, transmission are controlled, are in communication in the chip, programmed configurations is flexible, the construction cycle is short, system is simple, advantage such as have that high integration, volume are little, low-power consumption, I/O port are many can satisfy high speed acquisition well to the requirement of real-time and synchronism.
2, adopt high precision time service pps pulse per second signal to realize that the strange land of each monitoring terminal triggers synchronously, its synchronous error is minimum less than 12ns, has improved the order of magnitude of measuring accuracy greatly; B sign indicating number synchronization module is after microprocessor recognizes synchronous pps pulse per second signal, beginning time of reception data, and convert thereof into Beijing time.Being taken in to gather in real time at time reference is enabled or set sampling interval when arriving, and the rising edge of 1PPS signal will trigger the sampling logic module synchronously and finish the A/D high-speed sampling of a power frequency period according to sampling rate in the time of high level.
3, adopt core-theaded type zero flux current sensor technology, the drift that compensates is brought to measurement, phase tranformation error≤0.01 ° has solved dielectric loss measurement precision and stability problem thereof preferably.Adopt the punching small electric current sensor, select the initial permeability height for use, the little permalloy of loss is done iron core, adopts degree of depth negative-feedback technology, realizes iron core is automatically compensated, and makes iron core be operated in desirable zero magnetic flux state.This sensor can accurately detect 100
μThe power current of A～700mA.
4, owing to dielectric loss value in the condenser bushing insulated on-line monitoring is very little, therefore the high performance A/D conversion chip of needs is finished the collection to the signal imitation amount.And 16 A/D converters of high-performance successive approximation register type (being called for short the SAR type) of the ADS8505 of TI company to be a sampling rate be 250kSPS.This chip low in energy consumption, advantages such as volume is little, sampling rate and resolution height, required peripheral discrete component is few, the linearity is good have good effect to sampling processing of the present utility model.That the utility model is selected for use is the ADS8505 of TI company, it is that a sampling rate is 16 A/D converters of high-performance successive approximation register type (being called for short the SAR type) of 250kSPS, what adopted its inside is the capacitance matrix mode of CMOS technology, therefore the power consumption of this chip is lower, and volume ratio is less.And A/D inside has sampling holder usually, and it can keep sampled voltage up to EOC, and its switching rate is very fast.Its peripheral components is also less.
5, the RS485 serial communication adopts the ADM2483 of ADI, and ADM2483 is the RS485 interface chip that a band of ADI release is isolated, and is used for carrying out data communication with intelligent terminal.Adopt the balanced differential mode to transmit the serial voltage signal, namely the state of bus determines that by the voltage difference between the couple of conductor ability of anti-common mode interference is stronger.Differential mode does not require that the earth potential of node is identical, and to the very wide (200mV～6V), therefore increased the transmission range and the transmission speed (can reach 1200m, transfer rate can reach 100kbps during 1200m) that allow of the permissible range of level.
In a word, the utility model by based on the B sign indicating number to the time the real-time status of sleeve pipe dielectric loss on-line monitoring device monitoring bushing shell for transformer, rationally scientifically according to its state arrangement maintenance, can reduce a lot of manpower and materials, reduce the production run cost, increase work efficiency, also can reduce frequency of power cut simultaneously, improve the reliability of transmission of electricity.Measure good stability, repeatability, precision is high, reliability is high, and is easy to maintenance.
Description of drawings
Fig. 1 represents structured flowchart of the present utility model;
Fig. 2 represents A/D sample circuit figure of the present utility model;
Fig. 3 represents synchronous time service synoptic diagram of the present utility model;
Fig. 4 represents RS485 interface circuit figure of the present utility model;
Wherein 1. microprocessor modules, 2. signal selection module, 3. programmable amplifier module, 4.A/D conversion module, 5. sampling logic module, 6.B sign indicating number synchronization module, 7.RS485 bus, 8. reset circuit module, 9. signal condition module, 10. frequency measurement logic module, 11. punching current transformer module, 12. the voltage sensor module, the 13.FPGA chip.
Embodiment
Below in conjunction with drawings and Examples the utility model is further set forth, should be noted that following explanation only is in order to explain the utility model, its content not to be limited.
A kind of based on the B sign indicating number to the time sleeve pipe dielectric loss on-line monitoring device, it comprises microprocessor module 1 and the signal selection module 2, programmable amplifier module 3 and the A/D converter module 4 that connect successively; Described A/D converter module 4 is connected to microprocessor module 1 by sampling logic module 5; Described microprocessor module 1 is connected with B sign indicating number synchronization module 6 and RS485 bus 7, and described RS485 bus 7 is connected with casing monitoring IED unit.
Described microprocessor module 1 also is connected with reset circuit module 8.
Described programmable amplifier module 3 is connected with signal condition module 9, and described signal condition module 9 is connected to microprocessor module 1 by frequency measurement logic module 10.
The input end of described signal selection module 2 is connected with collection PT secondary voltage voltage of signals sensor assembly 12 with punching current transformer module 11 respectively.
Described punching current transformer module 11 is BCT-2 type electromagnetic type punching small electric current sensor.
Described microprocessor module 1 is NisoII series flush bonding processor, and it is embedded into C
yOn the clone series EP2C5T144C8N fpga chip 1.
Described programmable amplifier module 3 is programmable gain instrument amplifier PGA204.
Described RS485 bus 7 adopts the ADM2483 chip.
As shown in Figure 1, the utility model adopts the FPGA (Field Programmable Gate Array) technology, is the main hardware carrier with fpga chip 13.Fpga chip 13 obtains humiture information by its embedded Nios II soft-core processor, realizes the measurement to the control of A/D converter module 4 real-time samplings and signal frequency, and finishes the functions such as buffering, processing, transmission of data.Be divided into two-way after the electrical equipment state simulation amount that obtains by the punching small electric current sensor and power frequency generation signal are selected, the one tunnel through after amplification, filtering, the square waveization, sends in the FPGA frequency measurement logic module 10 and finishes the signal frequency measurement; Another road amplify to be handled the back through self-adaptation and is converted to digital quantity by 16 high-precision a/d converters, sends into fpga chip 13 inner sampling logic modules, selects to use the direct and server of RS485 bus 7 to carry out communication at last.Realize accurately synchronously by the B sign indicating number clock source in the transformer station between each monitoring terminal.
As shown in Figure 2, A/D converter ADS8505 is by the 5V single power supply,
Be the chip selection signal end, when
Be low level
When pin is high level,
The negative edge of pin will trigger once new sampling, at this moment
Pin level is dragged down; If
For low expression is changed, after converting,
Pin level is corresponding to uprise, and internal data is updated, at this moment
Rising edge will enable to export parallel port data after the renewal.
As shown in Figure 3, after microprocessor recognizes the synchronous pps pulse per second signal of B sign indicating number, beginning time of reception data, and convert thereof into Beijing time.Being taken in to gather in real time at time reference is enabled or set sampling interval when arriving, and the rising edge of 1PPS signal will trigger the sampling logic module synchronously and finish the A/D high-speed sampling of a power frequency period according to sampling rate in the time of high level.
As shown in Figure 4, the RS485 interface ADM2483 of ADI, ADM2483 is that the RS485 interface chip that a band of ADI release is isolated considers that data quantity transmitted is little, and therefore also not communication can select for use simple and reliable RS485 to carry out communication between each monitoring terminal.The RS485 bus adopts the balanced differential mode to transmit the serial voltage signal, and namely the state of bus determines that by the voltage difference between the couple of conductor ability of anti-common mode interference is stronger.Differential mode does not require that the earth potential of node is identical, and to the very wide (200mV～6V), therefore increased the transmission range and the transmission speed (can reach 1200m, transfer rate can reach 100kbps during 1200m) that allow of the permissible range of level.
Principle of work of the present utility model:
The utility model adopts core-theaded type zero flux current sensor technology, the drift that compensates is brought to measurement; Adopt the Fourier analysis method of FPGA and high-precision A/D synchronous sampling technique and optimization, try to achieve amplitude, phase place and phase differential etc., and then obtain electric parameters such as required dielectric loss, leakage current, equivalent capacitance; Adopt B sign indicating number technology to carry out each monitoring device and carry out synchronized sampling, improved the measuring accuracy of system.
The utility model adopts harmonic analysis method, it is the current signal of measuring PT secondary side voltage signal and the sleeve pipe of flowing through by sensor device, again the simulating signal that obtains is converted into digital signal, adopt the method for digital spectrum analysis to obtain the first-harmonic of these two signals then, and then by fundamental phase relatively obtained dielectric loss tan δ.Be actually and carry out the fourier series decomposition to flowing through apparatus insulated current i (t), its expression formula is:
ω in the formula=2 π f, f is mains frequency; I
0DC component for electric current; I
kBe respectively the each harmonic amplitude of electric current;
Be respectively the each harmonic initial phase angle of electric current, k is positive integer.
The dielectric dissipation factor of sleeve pipe is:
Wherein,
With
Be respectively the first-harmonic initial phase angle of voltage and current.Hence one can see that, and the key of finding the solution condenser bushing equipment dielectric loss factor just is to remove the influence that system harmonics disturbs, and tries to achieve the initial phase angle of i (t) exactly.The i (t) that considers actual acquisition is the discrete periodic sequence through the finite length after dispersing, quantizing, suppose to represent discrete point (0≤n≤N-1 that sampling obtains with x (n), N is the total length of sequence, total sampling number corresponding to discrete waveform), can get after discrete Fourier transform (DFT) with x (n):
By following formula as can be known:
In the formula, X
R(k), X
I(k) be respectively real part and the imaginary part of X (k).
According to following formula as can be seen, sequence x (n) is the initial phase angle of i (t)
For:
Obtain the initial phase angle of two signals respectively by following formula, and then ask for relative dielectric dissipation factor tan δ according to formula (1-2).
Though above-mentionedly by reference to the accompanying drawings embodiment of the present utility model is described; but be not the restriction to the utility model protection domain; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.
Claims (8)
- One kind based on the B sign indicating number to the time sleeve pipe dielectric loss on-line monitoring device, it is characterized in that it comprises microprocessor module and the signal selection module, programmable amplifier module and the A/D converter module that connect successively; Described A/D converter module is connected to microprocessor module by the sampling logic module; Described microprocessor module is connected with B sign indicating number synchronization module and RS485 bus, and described RS485 bus is connected with casing monitoring IED unit.
- 2. sleeve pipe dielectric loss on-line monitoring device according to claim 1 is characterized in that described microprocessor module also is connected with the reset circuit module.
- 3. sleeve pipe dielectric loss on-line monitoring device according to claim 1 is characterized in that, described programmable amplifier module is connected with the signal condition module, and described signal condition module is connected to microprocessor module by the frequency measurement logic module.
- 4. sleeve pipe dielectric loss on-line monitoring device according to claim 1 is characterized in that, the input end of described signal selection module is connected with collection PT secondary voltage voltage of signals sensor assembly with the punching current transformer module respectively.
- 5. sleeve pipe dielectric loss on-line monitoring device according to claim 4 is characterized in that, described punching current transformer module is BCT-2 type electromagnetic type punching small electric current sensor.
- 6. sleeve pipe dielectric loss on-line monitoring device according to claim 1 is characterized in that, described microprocessor module is NisoII series flush bonding processor, and it is embedded on the Cyclone series EP2C5T144C8N fpga chip.
- 7. sleeve pipe dielectric loss on-line monitoring device according to claim 1 is characterized in that, described programmable amplifier module is programmable gain instrument amplifier PGA204.
- 8. sleeve pipe dielectric loss on-line monitoring device according to claim 1 is characterized in that, described RS485 bus adopts the ADM2483 chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320128819 CN203204080U (en) | 2013-03-20 | 2013-03-20 | Bushing dielectric loss on-line monitoring device based on B code timing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320128819 CN203204080U (en) | 2013-03-20 | 2013-03-20 | Bushing dielectric loss on-line monitoring device based on B code timing |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941100A (en) * | 2014-02-28 | 2014-07-23 | 国家电网公司 | Intelligent device for measuring dielectric loss factor and insulation resistance of power transformer |
| CN104407230A (en) * | 2014-11-17 | 2015-03-11 | 广州供电局有限公司 | Frequency domain dielectric spectrum measuring device for high voltage bushing |
| CN106841940A (en) * | 2017-01-13 | 2017-06-13 | 国家电网公司 | A kind of New insulated measuring device with electricity based on intelligent sensor technology |
| CN112910589A (en) * | 2021-01-19 | 2021-06-04 | 深圳市泰昂能源科技股份有限公司 | B code time synchronization signal receiving and forwarding circuit |
| CN113238132A (en) * | 2021-04-27 | 2021-08-10 | 平顶山学院 | Detection device and detection method of frequency domain dielectric spectrum tester |
-
2013
- 2013-03-20 CN CN 201320128819 patent/CN203204080U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941100A (en) * | 2014-02-28 | 2014-07-23 | 国家电网公司 | Intelligent device for measuring dielectric loss factor and insulation resistance of power transformer |
| CN104407230A (en) * | 2014-11-17 | 2015-03-11 | 广州供电局有限公司 | Frequency domain dielectric spectrum measuring device for high voltage bushing |
| CN104407230B (en) * | 2014-11-17 | 2016-08-17 | 广州供电局有限公司 | Dielectric spectroscopy measurement apparatus for bushing |
| CN106841940A (en) * | 2017-01-13 | 2017-06-13 | 国家电网公司 | A kind of New insulated measuring device with electricity based on intelligent sensor technology |
| CN112910589A (en) * | 2021-01-19 | 2021-06-04 | 深圳市泰昂能源科技股份有限公司 | B code time synchronization signal receiving and forwarding circuit |
| CN113238132A (en) * | 2021-04-27 | 2021-08-10 | 平顶山学院 | Detection device and detection method of frequency domain dielectric spectrum tester |
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