CN103543307A - Device for protecting standard equipment from impact of random high-current signals output by equipment under test - Google Patents
Device for protecting standard equipment from impact of random high-current signals output by equipment under test Download PDFInfo
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- CN103543307A CN103543307A CN201310323545.1A CN201310323545A CN103543307A CN 103543307 A CN103543307 A CN 103543307A CN 201310323545 A CN201310323545 A CN 201310323545A CN 103543307 A CN103543307 A CN 103543307A
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Abstract
The invention discloses a device for protecting standard equipment from impact of random high-current signals output by equipment under test. The device mainly comprises a random high-current signal filtration unit and a current signal compensation unit. The random high-current signal filtration unit comprises a current signal simulation filter module and a signal on-off control module. The signal input end of the signal on-off control module is used for being connected with a current signal output unit of the equipment under test. The signal output end of the signal on-off control module is connected with the signal input end of the current signal simulation filter module. The signal output end of the current signal simulation filter module is respectively connected with the signal input end of the signal on-off control module and the signal input end of the current signal compensation unit. The signal output end of the current signal compensation unit is used for being connected with a current input unit of standard equipment. The device is capable of protecting the standard equipment from the impact of random high-current signals output by the equipment under test, while results of judging whether the equipment under test is qualified or not by the standard equipment are free of influences.
Description
Technical field
The invention belongs to power equipment testing calibration field, particularly a kind of protecting standard equipment is avoided the device of the random large current signal impact of tested equipment output, can effectively prevent the random large current signal infringement standard device of tested equipment output.
Background technology
In power equipment testing calibration field, along with more and more higher to the precision of power equipment and functional requirement, equipment cost also increases day by day, therefore to the damage of scrapping the equipment of the time limit, can not bring great economic loss.In the testing calibration process to power equipment, time have a phenomenon of the current measuring unit of the random large current signal failure criteria equipment of tested equipment output.
Amplitude, attenuation characteristic and the duration etc. of the instantaneous large-signal while at present occurring that about electronic product the research of the phenomenon of transient high-current mainly concentrates on electronic product and powers on, its achievement in research be typically implemented in improve tested equipment structure, improve the standard of product, and research improves the aspects such as method of measuring accuracy.About recurrent tested equipment, export random large-signal to the injury assessment of standard device and prevent but research very few, also having no method, technology and implement device for solving this class problem.
Summary of the invention
The object of the present invention is to provide a kind of simple in structure, can protecting standard equipment avoid protecting standard equipment that large-signal impacts, avoids failure criteria equipment and can not affect standard device judged result and avoid the device that the random large current signal of tested equipment output impacts.
Above-mentioned purpose of the present invention can realize by following scheme: a kind of protecting standard equipment is avoided the device of the random large current signal impact of tested equipment output, it is characterized in that: it is mainly comprised of random large current signal filtering unit and current signal compensating unit, described random large current signal filtering unit comprises current signal analog filter block and signal break-make control module, the signal input part of described signal break-make control module is for being connected with the current signal output unit of tested equipment, the signal output part of described signal break-make control module is connected with the signal input part of current signal analog filter block, the signal output part of described current signal analog filter block respectively with signal break-make control module, the signal input part of current signal compensating unit connects, the signal output part of current signal compensating unit is for the electric current input block of connection standard equipment,
Described current signal analog filter block according to the parameter of steady current signal adjust self running parameter so that normal current signal pass through, the random large current signal that filtering is simultaneously abnormal, and in current signal analog filter block under steady state (SS), current signal compensating unit compensates the electric current of current signal analog filter block output, and synchronous signal break-make control module control circuit is communicated with; Otherwise current signal occurs that variation or current signal analog filter block are in instability status, signal break-make control module control circuit disconnects.
The present invention effectively protecting standard equipment avoids the random impact of current signal greatly that tested equipment is exported; and can not affect the result that standard device judges that whether qualified tested equipment is, can be widely used in the standard device protection in power equipment testing calibration field.
As embodiments of the present invention, described random large current signal filtering unit also comprises for the electric current induction module of sensory current size with for calculating the isoparametric current signal parameter calculating module of current amplitude and frequency, the signal input part of electric current induction module is for being connected with the current signal output unit of tested equipment, and the signal output part of electric current induction module is connected with the signal input part of current signal parameter calculating module; The signal output part of current signal parameter calculating module is connected with the signal input part of current signal analog filter block; The current signal that electric current induction module is exported the electric current out-put supply of tested equipment in non-contacting mode is changed, and the amplitude and the frequency parameter that by current signal parameter calculating module, are calculated real-time current signal offer current signal analog filter block.
As embodiments of the present invention, described current signal compensating unit comprises the compensating parameter intelligence computing module for offset value calculation, the signal compensation circuit for current signal being carried out specifically compensate, wherein, the signal input part of signal compensation circuit is connected with the signal output part of current signal analog filter block, compensating parameter intelligence computing module respectively, the signal output part of signal compensation circuit is for being connected with the electric current input block of standard device, and the signal output part of signal compensation circuit is the signal output part of current signal compensating unit.
As embodiments of the present invention, described compensating parameter intelligence computing module carrys out offset value calculation according to working environment parameter, real-time current value and impedance.
Adopt three layers of BP neural network to obtain real-Time Compensation value, its inner node weights are obtained by 5000 training.The input quantity of neural network is respectively: t current value ψ constantly
i(t), impedance
with environment temperature ζ
c(t), the formula of offset value calculation is
wherein, δ, λ and η are respectively the constant obtaining after to computing formula yojan according to training result.
As a kind of preferred implementation of the present invention, described compensating parameter intelligence computing module Configuration on FPGA processor.
Compared with prior art, the present invention has following significant technique effect:
The present invention can avoid being subject to the random impact of current signal greatly of tested equipment output by protecting standard equipment, and does not affect the result that standard device judges that whether qualified tested equipment is, can be widely used in the standard device protection in power equipment testing calibration field.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the random large current signal of tested equipment output in the embodiment of the present invention;
Fig. 2 composition frame chart of the present invention;
Fig. 3 is the workflow diagram of invention.
Embodiment
As Fig. 2, shown in 3, it is the device that a kind of protecting standard equipment of the present invention is avoided the random large current signal impact of tested equipment output, it is mainly comprised of random large current signal filtering unit and current signal compensating unit, random large current signal filtering unit comprises current signal analog filter block and signal break-make control module, the signal input part of signal break-make control module is for being connected with the current signal output unit of tested equipment, the signal output part of signal break-make control module is connected with the signal input part of current signal analog filter block, the signal output part of current signal analog filter block respectively with signal break-make control module, the signal input part of current signal compensating unit connects, the signal output part of current signal compensating unit is for the electric current input block of connection standard equipment,
Current signal analog filter block according to the parameter of steady current signal adjust self running parameter so that normal current signal pass through, the random large current signal that filtering is simultaneously abnormal, and in current signal analog filter block under steady state (SS), current signal compensating unit compensates the electric current of current signal analog filter block output, and synchronous signal break-make control module control circuit is communicated with; Otherwise current signal occurs that variation or current signal analog filter block are in instability status, signal break-make control module control circuit disconnects.
In the present embodiment, random large current signal filtering unit also comprises for the electric current induction module of sensory current size with for calculating the isoparametric current signal parameter calculating module of current amplitude and frequency, the signal input part of electric current induction module is for being connected with the current signal output unit of tested equipment, and the signal output part of electric current induction module is connected with the signal input part of current signal parameter calculating module; The signal output part of current signal parameter calculating module is connected with the signal input part of current signal analog filter block; The current signal that electric current induction module is exported the electric current out-put supply of tested equipment in non-contacting mode is changed, and the amplitude and the frequency parameter that by current signal parameter calculating module, are calculated real-time current signal offer current signal analog filter block.
Current signal compensating unit comprises the compensating parameter intelligence computing module for offset value calculation, the signal compensation circuit for current signal being carried out specifically compensate, compensating parameter intelligence computing module Configuration on FPGA processor.Wherein, the signal input part of signal compensation circuit is connected with the signal output part of current signal analog filter block, compensating parameter intelligence computing module respectively, the signal output part of signal compensation circuit is for being connected with the electric current input block of standard device, the signal output part of signal compensation circuit is the signal output part of current signal compensating unit, and compensating parameter intelligence computing module carrys out offset value calculation according to the working environment parameter of this device, real-time current value and impedance.In the present embodiment, adopt three layers of BP neural network to obtain real-Time Compensation value, its inner node weights are obtained by 5000 training.The input quantity of neural network is respectively: t current value ψ constantly
i(t), impedance
with environment temperature ζ
c(t), the formula of offset value calculation is
wherein, δ, λ and η are respectively the constant obtaining after to computing formula yojan according to training result.
As shown in Figure 1, the random large current signal that the tested equipment collecting for the present embodiment is exported.The three-phase Multifunctional AC/DC calibrating installation that tested equipment Wei Mou company produces, after being shunted to (voltage that is converted to 0.8V after the current distributing of 50A), the current signal of its output by oscillograph, sampled again, with oscillograph, observe the C phase current signal of its output, its C is carried out to normal range switching (range becomes 1.00A from 5.00A) mutually, and the value of the electric current that now its C exports mutually should be 0A.In this range handoff procedure, there is an abnormal random large current signal, this abnormal signal amplitude is large (being greater than 250A) very, if standard device receives this signal, probably suffers damage.
When using this device, the signal input part of this device is connected to the current output terminal mouth of tested equipment, and the signal output part of this device is connected to the current input terminal mouth of standard device.
Be illustrated in figure 3 workflow diagram of the present invention, first the current signal of the electric current out-put supply of tested equipment being exported in non-contacting mode by electric current induction module is changed, then by current signal parameter calculating module, calculated the parameters such as the amplitude of real-time current signal and frequency, according to the parameter of current signal stable in 2 seconds, adjust the running parameter of current signal analog filter block, guarantee that normal current signal can pass through, abnormal random large current signal is by filtering; After current signal analog filter block in stable condition, just current signal compensated, and allow signal break-make control module connection circuit.Once changing appears in current signal or current signal analog filter block is also unstable, signal break-make control module just allows circuit in off state; Otherwise signal break-make control module allows circuit communication.
The present invention regulates the running parameter of analog filter (current signal analog filter block) to realize auto adapted filtering according to parameters such as the current amplitude online calculating and frequencies, and carry out control circuit break-make according to the state of wave filter, can avoid being subject to the random impact of current signal greatly that tested equipment is exported by protecting standard equipment; Consider working environment of the present invention, real-time current value and impedance of the present invention etc. because usually current signal being compensated, enough little to having influence on of size of current to reduce the present invention, thus guarantee that the present invention does not affect the result that standard device judges that whether qualified tested equipment is.
Embodiments of the present invention are not limited to this; according to foregoing of the present invention; according to ordinary skill knowledge and the customary means of this area; do not departing under the above-mentioned basic fundamental thought of the present invention prerequisite; the present invention can also make modification, replacement or the change of other various ways, within all dropping on rights protection scope of the present invention.
Claims (5)
1. a protecting standard equipment is avoided the random device that current signal impacts greatly that tested equipment is exported, it is characterized in that: it is mainly comprised of random large current signal filtering unit and current signal compensating unit, described random large current signal filtering unit comprises current signal analog filter block and signal break-make control module, the signal input part of described signal break-make control module is for being connected with the current signal output unit of tested equipment, the signal output part of described signal break-make control module is connected with the signal input part of current signal analog filter block, the signal output part of described current signal analog filter block respectively with signal break-make control module, the signal input part of current signal compensating unit connects, the signal output part of current signal compensating unit is for the electric current input block of connection standard equipment,
Current signal analog filter block according to the parameter of steady current signal adjust self running parameter so that normal current signal pass through, the random large current signal that filtering is simultaneously abnormal, and in current signal analog filter block under steady state (SS), current signal compensating unit compensates the electric current of current signal analog filter block output, and synchronous signal break-make control module control circuit is communicated with; Otherwise current signal occurs that variation or current signal analog filter block are in instability status, signal break-make control module control circuit disconnects.
2. protecting standard equipment according to claim 1 is avoided the device of the random large current signal impact of tested equipment output, it is characterized in that: described random large current signal filtering unit also comprises for the electric current induction module of sensory current size with for calculating the current signal parameter calculating module of current amplitude and frequency parameter, the signal input part of electric current induction module is for being connected with the current signal output unit of tested equipment, and the signal output part of electric current induction module is connected with the signal input part of current signal parameter calculating module; The signal output part of current signal parameter calculating module is connected with the signal input part of current signal analog filter block; The current signal that electric current induction module is exported the electric current out-put supply of tested equipment in non-contacting mode is changed, and the amplitude and the frequency parameter that by current signal parameter calculating module, are calculated real-time current signal offer current signal analog filter block.
3. protecting standard equipment according to claim 2 is avoided the device of the random large current signal impact of tested equipment output, it is characterized in that: described current signal compensating unit comprises the compensating parameter intelligence computing module for offset value calculation, for current signal being carried out to the signal compensation circuit of concrete compensation, wherein, the signal input part of signal compensation circuit respectively with current signal analog filter block, the signal output part of compensating parameter intelligence computing module connects, the signal output part of signal compensation circuit is for being connected with the electric current input block of standard device, the signal output part of signal compensation circuit is the signal output part of current signal compensating unit.
4. protecting standard equipment according to claim 3 is avoided the device of the random large current signal impact of tested equipment output, it is characterized in that: offset value calculation formula is:
Wherein: ψ
i(t)-t current value constantly;
impedance constantly; ζ
c(t)-t environment temperature constantly; δ, λ and η are respectively the constant obtaining after to computing formula yojan according to training result.
5. protecting standard equipment according to claim 4 is avoided the device of the random large current signal impact of tested equipment output, it is characterized in that: described compensating parameter intelligence computing module Configuration on FPGA processor.
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| CN201310323545.1A CN103543307B (en) | 2013-07-29 | 2013-07-29 | Protective standard equipment is avoided the device that the random large current signal of tested equipment output impacts |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104535809A (en) * | 2014-12-24 | 2015-04-22 | 广东电网有限责任公司电力科学研究院 | Standard instrument protecting system capable of avoiding dangerous current signal damage |
| CN110806221A (en) * | 2018-08-06 | 2020-02-18 | 厦门雅迅网络股份有限公司 | MEMS sensor capable of defending resonance and resonance defending method thereof |
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| US20110050206A1 (en) * | 2009-05-27 | 2011-03-03 | Huang Ming-Hsi | Method for verifying the bandwidth and phase of a digital power control system |
| CN102510284A (en) * | 2011-09-23 | 2012-06-20 | 中达电通股份有限公司 | Methods and devices for calibrating alternating-current voltage signal and alternating current signal |
| CN103105513A (en) * | 2013-01-17 | 2013-05-15 | 广东电网公司电力科学研究院 | Protection device for removing damages caused by random large-signal of detected device on standard device |
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| US5719526A (en) * | 1994-11-09 | 1998-02-17 | Crest Audio, Inc. | Internal load monitor for amplifier |
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| CN110806221A (en) * | 2018-08-06 | 2020-02-18 | 厦门雅迅网络股份有限公司 | MEMS sensor capable of defending resonance and resonance defending method thereof |
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Address before: 510080 Dongfeng East Road, Guangdong, Guangzhou, water, Kong Kong, No. 8 Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation |
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