CN204101639U - A kind of lightning impulse earth loop impedance test instrument - Google Patents
A kind of lightning impulse earth loop impedance test instrument Download PDFInfo
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- CN204101639U CN204101639U CN201420487691.8U CN201420487691U CN204101639U CN 204101639 U CN204101639 U CN 204101639U CN 201420487691 U CN201420487691 U CN 201420487691U CN 204101639 U CN204101639 U CN 204101639U
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Abstract
The utility model discloses a kind of lightning impulse earth loop impedance test instrument, comprises impact signal generating unit, impact signal sampling unit, signal processing unit, output and key input unit and power supply unit.The utility model can reach ampere level and waveform parameter meets the multiple impact signal of the standard-requireds such as IEC, GB by output amplitude, can impulse grounding characteristic effectively under the different lightning wave conditioning of analogue measurement, application is wide, and there is compact, structure is portable, security is high, antijamming capability is strong, practicality is good feature, be beneficial to carrying out of outdoor on-the-spot earthing device Transient grounding resistance test job, be adapted at engineering is applied.
Description
Technical field
The utility model relates to earthing device state-detection evaluation areas, and in particular, relate to a kind of lightning impulse earth loop impedance test instrument, it, based on small magnitude dash current method of testing, can be effective to the measurement of earthing device Transient grounding resistance.
Background technology
Tradition earthing device Transient grounding resistance is mainly converted by mathematical modeling, coefficient of impact, experimental formula estimation scheduling theory account form, there is the defects such as poor universality, accuracy is low, validity cannot be verified.And can reflect that the big current simulated experiment of true lightning current operative condition produces very large experiment electric current due to needs, desired signal generating means is bulky, and usually need to adopt the alternating current of AC220V or AC380 as power supply, therefore, equipment heaviness, on-the-spot power taking is difficult, security is low problem can be faced, the test at very inconvenient scene uses, poor practicability.
At present, domestic and international market does not also have and aly can effectively simulate lightning current operative condition and the portable lightning impulse earth loop impedance test instrument can applied in engineering, by measuring power frequency earthing resistance, the relevant departments such as electric power, meteorology, electric railroad reflect that whether earthing device running status is good.But; the impact of the diffusing behavioural characteristic of electric current in the earth that be hit; larger difference is there is between impulse earthed resistance and power frequency earthing resistance; both can not be directly equivalent; and Practical Project also has to there is power frequency earthing resistance qualified, but earthing device cannot play the problem of timely earial drainage, protection personnel equipment safety when there is thunderbolt.
In view of this, the defect that the present inventor exists for correlation technique in current earthing device Transient grounding resistance field tests and instrument is furtherd investigate, and then has this case to produce.
Utility model content
The purpose of this utility model is to provide a kind of and can be applied in engineering and effectively can simulates the lightning impulse earth loop impedance test instrument of lightning current operative condition, and heavy, the on-the-spot power taking of equipment that the deficiency that poor universality that conventional impact impedance ground theory calculate mode exists, accuracy are low to solve, validity cannot be verified and existing big current simulation experiment method and device thereof have is difficult, security is low, antijamming capability is weak, the defect of poor practicability.
For reaching above-mentioned purpose, solution of the present utility model is:
A kind of lightning impulse earth loop impedance test instrument, comprising:
Impact signal generating unit, has boosting conditioning module, charging capacitor module, D/A modular converter, waveform memory module, power amplifier module and switch control rule output module; Boosting conditioning module is connected with charging capacitor module, and waveform memory module is connected with D/A modular converter, is jointly afterwards connected with switch control rule output module by power amplifier module, for realizing the output of dash current signal;
Impact signal sampling unit, has dash current sampling module and surge voltage sampling module, is respectively used to gather the impulse voltage response signal injecting and the dash current signal of test loop and loop produce;
Signal processing unit, there is filtration module, peak detection block, A/D modular converter, arm processor, control signal output module, human-machine interface module, record memory module and USB transport module, the output terminal of above-mentioned dash current sampling module and surge voltage sampling module is connected to the respective input of filtration module respectively, the output terminal of filtration module connects peak detection block successively, A/D modular converter, arm processor and control signal output module, record memory module, USB transport module is connected with an output terminal of control signal output module by human-machine interface module jointly,
Export and key input unit, there is the LED state indicating module, LCD display module and the input through keyboard module that are connected with human-machine interface module respectively, and the usb interface module be connected with above-mentioned USB transport module;
Power supply unit, having the power supply interface module, charging circuit control module and the rechargeable battery that are connected successively, is also impact signal generating unit, impact signal sampling unit, signal processing unit and output and key input unit supply of electrical energy for storage of electrical energy.
Further, this impact signal generating unit produces the shock-testing current signal that amplitude is ampere level, and type of waveform comprises 0.25/100us, 1/20us, 1.2/50us, 4/10us, 8/20us, 10/350us and 30/80us.
Further, the boosting conditioning module of this impact signal generating unit, D/A modular converter and power amplifier module are all by the effect of the control signal output module in signal processing unit.
Further, 10/350us standard lightning current waveform is preset with in the waveform memory module of this impact signal generating unit.
Further, the dash current sampling module of this impact signal sampling unit adopts shunt metering system, and surge voltage sampling module adopts voltage divider metering system.
Further, the filtration module of this signal processing unit adopts accuview antialiasing wave filter.
Further, this signal processing unit also has record mode block, and another output terminal of this filtration module is connected to this control signal output module by record mode block.
Further, this signal processing unit also has clock synchronization module, and this clock synchronization module is connected with control signal output module.
Further, the usb interface module of this output and key input unit provides A type and Type B two kinds of interfaces.
Further, the rechargeable battery of this power supply unit adopts DC12V portable lead-acid battery, and charges with the power supply adaptor that AC220V 50/60Hz turns DC18V.
After adopting said structure, a kind of lightning impulse earth loop impedance test instrument that the utility model relates to, the control signal output module of its signal processing unit is after receiving the test instruction sent through the input through keyboard module of human-machine interface module transmission, first act on impact signal generating unit and produce the surge waveform signal meeting setting and require, inject the measuring circuit that earthing device to be measured has arranged.Meanwhile, the dash current sampling module of impact signal sampling unit gathers the dash current signal in Injection Current loop, and surge voltage sampling module gathers the shock response voltage signal that voltage circuit produces.After dash current and response voltage signal after filtering module filtered process, detected by peak detection block and analyze impact signal peak value, and by record mode block real time record impact signal waveform under the effect of control signal output module.Analog to digital conversion is carried out by A/D modular converter successively and arm processor carries out calculation process afterwards by detecting the impact signal peak value that analyzes, obtain Transient grounding resistance value, finally by control signal output module, human-machine interface module, impact signal peak value, Transient grounding resistance measured value and impact signal waveform are shown in LCD display module successively.
Compared with prior art, the utility model can reach ampere level and waveform parameter meets the multiple impact signal of the standard-requireds such as IEC, GB by output amplitude, can impulse grounding characteristic effectively under the different lightning wave conditioning of analogue measurement, application is wide, and there is compact, structure is portable, security is high, antijamming capability is strong, practicality is good feature, be beneficial to carrying out of outdoor on-the-spot earthing device Transient grounding resistance test job, be adapted at engineering is applied.
Accompanying drawing explanation
Fig. 1 is the inside principle schematic of a kind of lightning impulse earth loop impedance test of the utility model instrument;
Fig. 2 is the outside annexation schematic diagram of a kind of lightning impulse of the utility model earth loop impedance test instrument.
In figure:
Impact signal generating unit A impact signal sampling unit B
Signal processing unit C exports and key input unit D
Power supply unit E earthing device F to be measured
Boosting conditioning module 1 charging capacitor module 2
D/A modular converter 3 waveform memory module 4
Power amplifier module 5 switch control rule output module 6
Dash current sampling module 7 surge voltage sampling module 8
Filtration module 9 peak detection block 10
A/D modular converter 11 arm processor 12
Record mode block 13 control signal output module 14
Human-machine interface module 15 clock synchronization module 16
Record memory module 17 USB transport module 18
Usb interface module 19 LED state indicating module 20
LCD display module 21 input through keyboard module 22
Power supply interface module 23 charging circuit control module 24
Rechargeable battery 25 charge power supply interface 26
Current terminal 27 voltage terminal 28
Protective ground terminal 29 keyboard 30
LCD liquid crystal display screen 31 USB interface 32.
Embodiment
In order to explain the technical solution of the utility model further, below by specific embodiment, the utility model is elaborated.
As shown in Figure 1, a kind of preferred embodiment of lightning impulse earth loop impedance test instrument is related to for the utility model shown in it, this lightning impulse earth loop impedance test instrument comprises impact signal generating unit A, impact signal sampling unit B, signal processing unit C, output and key input unit D and power supply unit E, wherein:
Impact signal generating unit A, has boosting conditioning module 1, charging capacitor module 2, D/A modular converter 3, waveform memory module 4, power amplifier module 5 and switch control rule output module 6.Boosting conditioning module 1 is connected with charging capacitor module 2, and waveform memory module 4 is connected with D/A modular converter 3, is jointly connected with switch control rule output module 6 by power amplifier module 5 afterwards.Described boosting conditioning module 1 accepts the DC12V signal from power supply unit E, DC12V signal is boosted to DC500V and carries out voltage stabilizing conditioning, sends into charging capacitor module 2 afterwards and charges.Meanwhile, D/A modular converter 3 calls the 10/350us standard thunder and lightning waveform digital signal of storage in waveform memory module 4 and is converted to simulating signal feeding power amplifier module 5, under the control signal output module 14 of power amplifier module 5 in signal processing unit C acts on afterwards, the energy utilizing charging capacitor module 2 to discharge to provide is by selected waveform parameter (containing wave head time and half time to peak) regulation output shock-testing signal, obtain enough signal amplitudes, the last output being realized shock-testing signal again by switch control rule output module 6, and be applied in earthing device F to be measured.Wherein, conditioning module 1 of boosting and D/A modular converter 3 are all by the effect of the control signal output module 14 in signal processing unit C.In addition, preferably, switch control rule output module 6 is also connected with impact signal sampling unit B, test loop situation can be fed back to successively power amplifier module 5, charging capacitor module 2 and boosting conditioning module 1, discharged again by boost charge and realize the feedback regulation of power amplification multiple, thus export the shock-testing signal mutually mated with test loop.
Impact signal sampling unit B, there is dash current sampling module 7 and surge voltage sampling module 8, dash current sampling module 7 adopts shunt metering system, surge voltage sampling module 8 adopts voltage divider metering system, realizes the collection that test loop injects the impulse voltage response signal that dash current signal and loop produce respectively.
Signal processing unit C, there is filtration module 9, peak detection block 10, A/D modular converter 11, arm processor 12, control signal output module 14, human-machine interface module 15, clock synchronization module 16, record memory module 17 and USB transport module 18, the output terminal of above-mentioned dash current sampling module 7 and surge voltage sampling module 8 is connected to the respective input of filtration module 9 respectively, the output terminal of filtration module 9 connects peak detection block 10 successively, A/D modular converter 11, arm processor 12 and control signal output module 14, record memory module 17, USB transport module 18 is connected with an output terminal of control signal output module 14 by human-machine interface module 15 jointly.Filtration module 9 receives dash current and voltage signal that impact signal sampling module B collects and after filtering process, sends into peak detection block 10 and detects the peak value analyzing impact signal, arm processor 12 is sent into, afterwards in conjunction with impulse earthed resistance engineering definition R=U after converting impact signal peak analogue signal to digital signal via A/D modular converter 11 again
m/ I
mcarry out calculation process, thus try to achieve the Transient grounding resistance value of tested earthing device.Finally computing acquired results is sent into human-machine interface module 15 through control signal output module 14.Record memory module 17 is for storing field test data and waveform, and USB transport module 18 is for realizing data transmission.In addition, preferably, signal processing unit C also has clock synchronization module 16 and record mode block 13, and this clock synchronization module 16 is connected with control signal output module 14, for providing synchronizing clock signals to instrument; Another output terminal of filtration module 9 is connected to control signal output module 14 by record mode block 13, and record mode block 13, under control signal output module 14 acts on, records ripple in real time to the impact signal after filtration module 9 filtering process.
Export and key input unit D, there is the LED state indicating module 20, LCD display module 21, input through keyboard module 22 and the usb interface module 19 that is connected with USB transport module 18 that are connected with human-machine interface module 15, thus realize the display directly perceived of test mode, test data and test waveform and test instruction input respectively, historical data downloads analytic function.In addition, preferably, this usb interface module 19 provides A type and Type B two kinds of interfaces, can realize test record derivation by direct external movable memory equipment, also can be connected with PC, realize data transmission.
Power supply unit E, has the power supply interface module 23, charging circuit control module 24 and the rechargeable battery 25 that are connected successively.Power supply unit E is used for storage of electrical energy and is impact signal generating unit A, impact signal sampling unit B, signal processing unit C and output and key input unit D supply of electrical energy.
Like this, a kind of lightning impulse earth loop impedance test instrument that the utility model relates to, the control signal output module 14 of its signal processing unit C is after receiving the test instruction sent through the input through keyboard module 22 of human-machine interface module 15 transmission, first act on impact signal generating unit A and produce the surge waveform signal meeting setting and require, inject the measuring circuit that earthing device F to be measured has arranged.Meanwhile, the dash current sampling module 7 of impact signal sampling unit B gathers the dash current signal in Injection Current loop, and surge voltage sampling module 8 gathers the shock response voltage signal that voltage circuit produces.The dash current collected and response voltage signal, after filtering after module 9 filtering process, are detected by peak detection block 10 and analyze impact signal peak value, and by record mode block 13 real time record impact signal waveform under control signal output module 14 acts on.Analog to digital conversion is carried out by A/D modular converter 11 successively and arm processor 12 carries out calculation process afterwards by detecting the impact signal peak value that analyzes, obtain Transient grounding resistance measured value, finally by control signal output module 14, human-machine interface module 15, impact signal peak value, Transient grounding resistance measured value and impact signal waveform are shown in LCD display module 21 successively.
The utility model provides a kind of lightning impulse earth loop impedance test instrument, can can reach ampere level and waveform parameter meets the multiple impact signal of the standard-requireds such as IEC, GB by output amplitude, can impulse grounding characteristic effectively under the different lightning wave conditioning of analogue measurement, application is wide, and there is compact, structure is portable, security is high, antijamming capability is strong, practicality is good feature, be beneficial to carrying out of outdoor on-the-spot earthing device Transient grounding resistance test job, be adapted at engineering is applied.
As shown in Figure 2, below for the test of certain well type earthing device, introduce the whole process of test, it specifically comprises the steps:
1) doubly arrange auxiliary current pole in left and right by the 1-3 of the maximum geometrical equivalence radius of well type earthing device to be measured (or maximal rays length), lay p-wire, form current return with well type earthing device down conductor.With reference to fall-of-potential method principle, in location arrangements boosting voltage pole that is extremely equidirectional with auxiliary current, that be about auxiliary current pole and earthing device edge effective length about 0.618 times, lay p-wire, form voltage circuit with well type earthing device down conductor;
2) current terminal 27 of lightning impulse earth loop impedance test instrument is accessed current return, voltage terminal 28 accesses voltage circuit, opens the power switch device on keyboard 30, and it when needed, need be connected with extraneous power supply by charge power supply interface 26 certainly.Protective ground terminal 29 is independently received in the earth, to guarantee instrument and the safety of personnel in operation use procedure;
3) corresponding digital keys is operated by keyboard 30, select the test waveform type of lightning impulse earth loop impedance test instrument, this instrument provides the multiple standards thunder and lightning waveforms such as 0.25/100us, 1/20us, 1.2/50us, 4/10us, 8/20us, 10/350us, 30/80us optional;
4) after choosing test surge waveform type, operand word 1(Start on keyboard 30) start test, lightning impulse earth loop impedance test instrument exports impact signal, in test process, switch control rule output module 6 action of instrument Automatic adjusument signal magnitude, until reach the impact signal amplitude of mutually mating completely with test loop situation;
5) test terminates, and can check test result, the digital 2(Save on keypad 30 in LCD liquid crystal display screen 31) test result can be saved in record memory module 17, dash current and High Voltage Impulse Waveform can be checked by upper and lower directionkeys;
6) after step 5 completes, for obtaining test result more accurately, can digital 1(Retest on keypad 30) again repeatedly test by the process in step 4), and above-mentioned repeatedly test result is all preserved and recorded;
7) last, ask for repeatedly the arithmetic mean of test result, be this earthing device Transient grounding resistance measured value.
The utility model is when testing, current return is accessed by the current terminal 27 of Fig. 2, voltage terminal 28 accesses voltage circuit, while injecting dash current to current return, gather the response voltage signal on voltage circuit, the impact Injection Current signal collected and shock response voltage signal are carried out to the filtering process of filtration module 9, detect through peak detection block 10 and analyze impact signal peak value, be converted to digital signal through A/D modular converter 11 send into arm processor 12 and carry out calculation process in conjunction with Transient grounding resistance engineering definition, then result is successively by control signal output module 14, human-machine interface module 15 is delivered in LCD liquid crystal display screen 31 and is carried out showing and recording in memory module 17 storing.In addition, the real time record of being carried out impact signal waveform by record mode block 13 is also supported.
The utility model has following advantage:
One is to export the multiple impact signal meeting the standard-requireds such as IEC, GB such as 0.25/100us, 1/20us, 1.2/50us, 4/10us, 8/20us, 10/350us, 30/80us, can impulse grounding characteristic effectively under the different lightning wave conditioning of analogue measurement, application is wide;
Two is to export ampere level measuring current, compares milliampere level measuring current, has higher signal to noise ratio (S/N ratio), and adopts accuview antialiasing wave filter, and on-the-spot antijamming capability is good.
Three is adopt long-endurance portable lead-acid battery as power supply, compact, structure are portable, security is high, practicality is good, be beneficial to carrying out of outdoor on-the-spot earthing device Transient grounding resistance test job, be adapted at engineering is applied.
Above-described embodiment and graphic and non-limiting product form of the present utility model and style, any person of an ordinary skill in the technical field, to its suitable change done or modification, all should be considered as not departing from patent category of the present utility model.
Claims (10)
1. a lightning impulse earth loop impedance test instrument, is characterized in that, comprising:
Impact signal generating unit, has boosting conditioning module, charging capacitor module, D/A modular converter, waveform memory module, power amplifier module and switch control rule output module; Boosting conditioning module is connected with charging capacitor module, and waveform memory module is connected with D/A modular converter, is jointly afterwards connected with switch control rule output module by power amplifier module, for realizing the output of dash current signal;
Impact signal sampling unit, has dash current sampling module and surge voltage sampling module, is respectively used to gather the impulse voltage response signal injecting and the dash current signal of test loop and loop produce;
Signal processing unit, there is filtration module, peak detection block, A/D modular converter, arm processor, control signal output module, human-machine interface module, record memory module and USB transport module, the output terminal of above-mentioned dash current sampling module and surge voltage sampling module is connected to the respective input of filtration module respectively, the output terminal of filtration module connects peak detection block successively, A/D modular converter, arm processor and control signal output module, record memory module, USB transport module is connected with an output terminal of control signal output module by human-machine interface module jointly,
Export and key input unit, there is the LED state indicating module, LCD display module and the input through keyboard module that are connected with human-machine interface module respectively, and the usb interface module be connected with above-mentioned USB transport module;
Power supply unit, having the power supply interface module, charging circuit control module and the rechargeable battery that are connected successively, is also impact signal generating unit, impact signal sampling unit, signal processing unit and output and key input unit supply of electrical energy for storage of electrical energy.
2. a kind of lightning impulse earth loop impedance test instrument as claimed in claim 1, it is characterized in that, this impact signal generating unit produces the shock-testing current signal that amplitude is ampere level, and type of waveform comprises 0.25/100us, 1/20us, 1.2/50us, 4/10us, 8/20us, 10/350us and 30/80us.
3. a kind of lightning impulse earth loop impedance test instrument as claimed in claim 1, it is characterized in that, the boosting conditioning module of this impact signal generating unit, D/A modular converter and power amplifier module are all by the effect of the control signal output module in signal processing unit.
4. a kind of lightning impulse earth loop impedance test instrument as claimed in claim 1, it is characterized in that, the waveform memory module in this impact signal generating unit is preset with 10/350us standard lightning current waveform.
5. a kind of lightning impulse earth loop impedance test instrument as claimed in claim 1, is characterized in that, the dash current sampling module of this impact signal sampling unit adopts shunt metering system, and surge voltage sampling module adopts voltage divider metering system.
6. a kind of lightning impulse earth loop impedance test instrument as claimed in claim 1, is characterized in that, the filtration module of this signal processing unit adopts accuview antialiasing wave filter.
7. a kind of lightning impulse earth loop impedance test instrument as claimed in claim 1, is characterized in that, this signal processing unit also has record mode block, and another output terminal of this filtration module is connected to this control signal output module by record mode block.
8. a kind of lightning impulse earth loop impedance test instrument as claimed in claim 1, it is characterized in that, this signal processing unit also has clock synchronization module, and this clock synchronization module is connected with control signal output module.
9. a kind of lightning impulse earth loop impedance test instrument as claimed in claim 1, is characterized in that, the usb interface module of this output and key input unit provides A type and Type B two kinds of interfaces.
10. a kind of lightning impulse earth loop impedance test instrument as claimed in claim 1, is characterized in that, the rechargeable battery of this power supply unit adopts DC12V portable lead-acid battery, and charges with the power supply adaptor that AC220V 50/60Hz turns DC18V.
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| CN201420487691.8U CN204101639U (en) | 2014-08-26 | 2014-08-26 | A kind of lightning impulse earth loop impedance test instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842542A (en) * | 2016-04-13 | 2016-08-10 | 云南电网有限责任公司电力科学研究院 | Grounding device impacted grounding resistance measuring method and system |
| CN112269062A (en) * | 2020-09-14 | 2021-01-26 | 中国南方电网有限责任公司超高压输电公司广州局 | Valve section module element impedance tester |
-
2014
- 2014-08-26 CN CN201420487691.8U patent/CN204101639U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842542A (en) * | 2016-04-13 | 2016-08-10 | 云南电网有限责任公司电力科学研究院 | Grounding device impacted grounding resistance measuring method and system |
| CN112269062A (en) * | 2020-09-14 | 2021-01-26 | 中国南方电网有限责任公司超高压输电公司广州局 | Valve section module element impedance tester |
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| C14 | Grant of patent or utility model | ||
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| CP01 | Change in the name or title of a patent holder |
Address after: Unit E 21 layer ocean light No. 33 building, 361001 Xiamen Road, Siming District, Narcissus in Fujian Province Patentee after: Red phase Limited by Share Ltd Address before: Unit E 21 layer ocean light No. 33 building, 361001 Xiamen Road, Siming District, Narcissus in Fujian Province Patentee before: Xiamen Red Phase Instruments Inc. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 361001 one of the 1002 units of No. 3 Nantou Road, Siming District, Xiamen, Fujian. Patentee after: Red phase Limited by Share Ltd Address before: 361001 E 21 unit, Hai Guang building, 33 Narcissus Road, Siming Road, Xiamen, Fujian Patentee before: Red phase Limited by Share Ltd |
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| CP02 | Change in the address of a patent holder |