CN102981058A - Anti-interference direct current resistance testing device - Google Patents
Anti-interference direct current resistance testing device Download PDFInfo
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- CN102981058A CN102981058A CN2012105149371A CN201210514937A CN102981058A CN 102981058 A CN102981058 A CN 102981058A CN 2012105149371 A CN2012105149371 A CN 2012105149371A CN 201210514937 A CN201210514937 A CN 201210514937A CN 102981058 A CN102981058 A CN 102981058A
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Abstract
The invention relates to an anti-interference direct current resistance testing device, which adopts the structure that a direct current, constant voltage and constant current source is connected with an impedance matching unit; the impedance matching unit and a data testing and calculating unit are respectively connected with a standard resistance and measured resistance sampling unit, a relay test action unit and an interference voltage detecting unit; the data test calculating unit is connected with a display unit; the display unit is connected with a keyboard and an over-voltage protection unit; and the keyboard and the over-voltage protection unit are connected with a storage and printing unit. The device can meet the requirements of achieving smooth and accurate test of direct current resistance under the condition of a 350V relative interference voltage or a 100V interphase interference voltage.
Description
Technical field
The present invention relates to a kind of power equipment proving installation, relate in particular to a kind of anti-interference direct current resistance proving installation, be applied to the test of power equipment direct current resistance.
Background technology
At present, along with the power construction development, 66kV and Above Transmission Lines are joint used with scissors crossing and are on the increase, and cause the mutual induced voltage of transmission line of electricity very high, and single-phase voltage-to-ground can reach about 350V, and voltage between phases can reach about 100V.
The direct current resistance m easurem ent of circuit is in order to check the basic data of circuit crimp head quality and circuit distance fault location, it also is the Main Basis of estimating the line construction quality, but because of line influence voltage height, instrument for measuring DC resistance with routine, such as double bridge, digital direct current resistance meter, can't finish the test of circuit direct current resistance at all, the serious deviation of test data often occur, even instrument damage and human body electrification accident occur.The direct current resistance test event can't be carried out so far in this area under strong jamming voltage, but the direct current resistance pilot project is again line parameter circuit value indispensable one, therefore studies a kind of anti-interference direct current resistance proving installation, is the needs that satisfy on-the-spot real work.
Summary of the invention
The present invention is directed to above-mentioned problems of the prior art, a kind of anti-interference direct current resistance proving installation is proposed, adopt harmonic analysis method to realize the parameter measurement of high-tension line direct current resistance, solved the test that to finish the circuit direct current resistance in the prior art, the serious deviation of test data often occurs, even the problem of instrument damage and human body electrification accident occurs.
Technical scheme of the present invention is as follows:
The dc constant voltage constant current source is connected with impedance matching unit; Impedance matching unit is connected with the data test computing unit with measuring resistance and measured resistance sampling unit, relay test action unit and interference voltage detecting unit and is connected; The data test computing unit connects display unit; Display unit connects keyboard, Overvoltage protecting unit; Keyboard, Overvoltage protecting unit connect storage and print unit.
Described dc constant voltage constant current source is, the EMI filtering circuit connects current rectifying and wave filtering circuit I, current rectifying and wave filtering circuit I connects isolating transformer and pwm control circuit, isolating transformer connects current rectifying and wave filtering circuit II, current rectifying and wave filtering circuit II connects sampling amplifier, sampling amplifier connects photoelectric coupling circuit, and photoelectric coupling circuit connects pwm control circuit.
Described impedance matching unit is selected in the different resistance value series connection access test loops according to the interchange interference voltage amplitude size that detects.
Described data test computing unit is that electric pressure converter is connected OR circuit and is connected with photoisolator with current converter; Photoisolator connects CPU; Working power adopts analog-and digital-two groups of Switching Power Supplies of separating, and analog switched power supply and digital switch power supply are by high speed optoelectronic coupling isolation; Voltage signal in the simulating signal is through dividing potential drop, and overvoltage protection amplifies buffering through operational amplifier again and gives the AD analog converter that gathers voltage, processes by analysis again, obtains needed data.
Described measuring resistance and measured resistance sampling unit comprise the voltage measurement collecting unit; the voltage measurement collecting unit is; superpotential input protection control module connects the constant-current source output module; the constant-current source output module connects interchange and disturbs the decrease uptake filtration module; exchange and disturb the impedance of decrease uptake filtration module matching connection; matched impedance connects test line resistance, test line resistance connection standard resistance, and measuring resistance connects to exchange disturbs the decrease uptake filtration module.
Described voltage measurement collecting unit adopts U1, U2, U3 three road voltage tester passages, dc voltage electrode, the negative pole of U1 fixing test standard resistor at two terminals; The negative pole of U2 test measured resistance, the negative pole of measuring resistance; The positive pole of U3 test measured resistance, the negative pole of measuring resistance.
Advantageous effect of the present invention is to adopt harmonic analysis method to realize the parameter measurement of high-tension line direct current resistance.Because the structures such as impedance matching unit have been installed, through after a series of filtering, isolation and the rectification, interference voltage divided melt, only measure at last DC component, reach under interference voltage the smoothly purpose of test direct current resistance, concrete characteristics are as follows:
1, adopt anti-interference direct current resistance proving installation thinking novel, rig-site utilization is strong.
2, volume, weight and double bridge are close.
Instrument damage and human body electrification accident can not occur in 3, test connection safety convenient.
4, significantly improve antijamming capability, reach accurately purpose of test figure.
5, practical, applied range.
Description of drawings
Fig. 1 is one-piece construction schematic block diagram of the present invention.
Fig. 2 is the theory structure block diagram of dc constant voltage constant current source of the present invention.
Fig. 3 is data test computing unit theory structure block diagram of the present invention.
Fig. 4 is voltage measurement collecting unit theory structure block diagram.
Embodiment
Embodiment
As shown in Figure 1, the dc constant voltage constant current source is connected with impedance matching unit; Impedance matching unit is connected with the data test computing unit with measuring resistance and measured resistance sampling unit, relay test action unit and interference voltage detecting unit and is connected; The data test computing unit connects display unit; Display unit connects keyboard, Overvoltage protecting unit; Keyboard, Overvoltage protecting unit connect storage and print unit.
As shown in Figure 2, described dc constant voltage constant current source is, the EMI filtering circuit connects current rectifying and wave filtering circuit I, current rectifying and wave filtering circuit I connects isolating transformer and pwm control circuit, isolating transformer connects current rectifying and wave filtering circuit II, current rectifying and wave filtering circuit II connects sampling amplifier, and sampling amplifier connects photoelectric coupling circuit, and photoelectric coupling circuit connects pwm control circuit.Dc constant voltage constant current source output rating 280W, 28V/10A; Adopt programmed control digital regulation resistance adjustment control DC voltage amplitude to guarantee as far as possible power supply according to rated power output voltage, electric current, improve signal to noise ratio (S/N ratio).
Described impedance matching unit according to the interchange interference voltage amplitude size that instrument detects, is selected to be used for effectively reducing interference voltage to the purpose of direct current signal impact in the different resistance value series connection access test loops.
As shown in Figure 3, described data test computing unit is that electric pressure converter is connected OR circuit and is connected with photoisolator with current converter; Photoisolator connects CPU; Working power adopts analog-and digital-two groups of Switching Power Supplies of separating, and can avoid like this interfering with each other, and can guarantee again the staff's of operating instrument safety, and analog switched power supply and digital switch power supply are realized fully isolation by the high speed optoelectronic coupling.Voltage signal in the simulating signal is through dividing potential drop, and overvoltage protection amplifies buffering through operational amplifier again and gives the AD that gathers voltage.Process by analysis again, obtain needed data.
As shown in Figure 4; described measuring resistance and measured resistance sampling unit comprise the voltage measurement collecting unit; the voltage measurement collecting unit is; superpotential input protection control module connects the constant-current source output module; the constant-current source output module connects interchange and disturbs the decrease uptake filtration module, exchanges to disturb the impedance of decrease uptake filtration module matching connection, and matched impedance connects test line resistance; test line resistance connection standard resistance, measuring resistance connect interchange and disturb the decrease uptake filtration module.
Three independently test channel are adopted in voltage measurement, can improve sample rate, both can avoid the signal between the voltage to disturb, and can also reduce the asynchronous problem that voltage and current signal gathers.
Voltage tester passage totally 3 tunnel, U1, U2, U3, dc voltage measurement a bit altogether, i.e. the negative pole of measuring resistance, corresponding test point is referring to Fig. 4.
U1: the DC voltage+utmost point of fixing test standard resistor at two terminals ,-utmost point; Obtain the measuring current value with test voltage divided by the measuring resistance value; In order to adjust resistance control output voltage, the current value of numerical value potentiometer.
U2: the test measured resistance-utmost point, measuring resistance-utmost point; As intermediate variable, be measured resistance by U3-U2=Uk, try to achieve tested dc resistance with measuring resistance U1.
U3: the test measured resistance+utmost point, measuring resistance-utmost point.
The test resistance computing formula:
Total value: Rxx=Rb * ((U3-U2)/U1)
Every kilometer value: Rxx=(Rb * ((U3-U2)/U1))/length
Temperature coefficient k=(225+20)/(225+Tm)
Antijamming capability of the present invention is: circuit is interference voltage 350V relatively; Circuit interphase interference voltage 100V;
Measurement circuit resistance range: 2m Ω～80 Ω; Highest resolution 5 μ Ω; Test accuracy is under noiseless condition: reach 0.2 grade; Externally have under 5～100V power frequency interference voltage: reach 0.5 grade.
Claims (6)
1. anti-interference direct current resistance proving installation is characterized in that the dc constant voltage constant current source is connected with impedance matching unit; Impedance matching unit is connected with the data test computing unit with measuring resistance and measured resistance sampling unit, relay test action unit and interference voltage detecting unit and is connected; The data test computing unit connects display unit; Display unit connects keyboard, Overvoltage protecting unit; Keyboard, Overvoltage protecting unit connect storage and print unit.
2. anti-interference direct current resistance proving installation according to claim 1, it is characterized in that described dc constant voltage constant current source is, the EMI filtering circuit connects current rectifying and wave filtering circuit I, current rectifying and wave filtering circuit I connects isolating transformer and pwm control circuit, isolating transformer connects current rectifying and wave filtering circuit II, current rectifying and wave filtering circuit II connects sampling amplifier, and sampling amplifier connects photoelectric coupling circuit, and photoelectric coupling circuit connects pwm control circuit.
3. anti-interference direct current resistance proving installation according to claim 1 is characterized in that described impedance matching unit according to the interchange interference voltage amplitude size that detects, and selects in the different resistance value series connection access test loops.
4. anti-interference direct current resistance proving installation according to claim 1 is characterized in that described data test computing unit is, electric pressure converter is connected OR circuit and is connected with photoisolator with current converter; Photoisolator connects CPU; Working power adopts analog-and digital-two groups of Switching Power Supplies of separating, and analog switched power supply and digital switch power supply are by high speed optoelectronic coupling isolation; Voltage signal in the simulating signal is through dividing potential drop, and overvoltage protection amplifies buffering through operational amplifier again and gives the AD analog converter that gathers voltage, processes by analysis again, obtains needed data.
5. anti-interference direct current resistance proving installation according to claim 1; it is characterized in that described measuring resistance and measured resistance sampling unit comprise the voltage measurement collecting unit; the voltage measurement collecting unit is; superpotential input protection control module connects the constant-current source output module; the constant-current source output module connects interchange and disturbs the decrease uptake filtration module; exchange and disturb the impedance of decrease uptake filtration module matching connection; matched impedance connects test line resistance; test line resistance connection standard resistance, measuring resistance connect interchange and disturb the decrease uptake filtration module.
6. anti-interference direct current resistance proving installation according to claim 5 is characterized in that described voltage measurement collecting unit adopts U1, U2, U3 three road voltage tester passages, dc voltage electrode, the negative pole of U1 fixing test standard resistor at two terminals; The negative pole of U2 test measured resistance, the negative pole of measuring resistance; The positive pole of U3 test measured resistance, the negative pole of measuring resistance.
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Cited By (6)
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| CN103293385A (en) * | 2013-05-14 | 2013-09-11 | 国家电网公司 | Direct-current resistance quick testing device for transformers in temperature-rise tests |
| CN105092926A (en) * | 2014-05-15 | 2015-11-25 | Abb技术股份公司 | Impedance matching element for voltage and/or current sensing devices |
| CN105785130A (en) * | 2016-03-21 | 2016-07-20 | 国家电网公司 | High-voltage line induced voltage and direct-current resistance measuring device |
| CN107167649A (en) * | 2017-05-23 | 2017-09-15 | 杭州兆华电子有限公司 | A kind of electret microphone current testing circuit and its method of testing |
| CN107843769A (en) * | 2016-09-20 | 2018-03-27 | 长沙乐昌林电子科技有限公司 | A kind of design of resistance capacitance electric inductance measuring-testing instrument |
| CN112578185A (en) * | 2020-11-13 | 2021-03-30 | 国网江苏省电力有限公司电力科学研究院 | Device and method for testing direct current resistance of conductor bearing electromagnetic coupling induced potential |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293385A (en) * | 2013-05-14 | 2013-09-11 | 国家电网公司 | Direct-current resistance quick testing device for transformers in temperature-rise tests |
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| CN105092926A (en) * | 2014-05-15 | 2015-11-25 | Abb技术股份公司 | Impedance matching element for voltage and/or current sensing devices |
| CN105785130A (en) * | 2016-03-21 | 2016-07-20 | 国家电网公司 | High-voltage line induced voltage and direct-current resistance measuring device |
| CN107843769A (en) * | 2016-09-20 | 2018-03-27 | 长沙乐昌林电子科技有限公司 | A kind of design of resistance capacitance electric inductance measuring-testing instrument |
| CN107167649A (en) * | 2017-05-23 | 2017-09-15 | 杭州兆华电子有限公司 | A kind of electret microphone current testing circuit and its method of testing |
| CN112578185A (en) * | 2020-11-13 | 2021-03-30 | 国网江苏省电力有限公司电力科学研究院 | Device and method for testing direct current resistance of conductor bearing electromagnetic coupling induced potential |
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