CN202939224U - Anti-interference direct-current resistance testing device - Google Patents

Anti-interference direct-current resistance testing device Download PDF

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Publication number
CN202939224U
CN202939224U CN 201220662353 CN201220662353U CN202939224U CN 202939224 U CN202939224 U CN 202939224U CN 201220662353 CN201220662353 CN 201220662353 CN 201220662353 U CN201220662353 U CN 201220662353U CN 202939224 U CN202939224 U CN 202939224U
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CN
China
Prior art keywords
unit
resistance
connects
voltage
test
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 201220662353
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Chinese (zh)
Inventor
刘国斌
王清昊
顾孟山
李萍
王翼
李岩
张宁
李刚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Fushun Power Supply Co of Liaoning Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Fushun Power Supply Co of Liaoning Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, Fushun Power Supply Co of Liaoning Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN 201220662353 priority Critical patent/CN202939224U/en
Application granted granted Critical
Publication of CN202939224U publication Critical patent/CN202939224U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model relates to an anti-interference direct-current resistance testing device. The structure of the device is as follows: 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 calculation unit are connected with a standard resistance and measured resistance sampling unit, a relay testing action unit and an interference voltage detection unit; the data testing and calculation unit is connected with a display unit; and the display unit is connected with a keyboard and an overvoltage protection unit; and the keyboard and the overvoltage protection unit are connected with a storing and a printing unit. With the anti-interference direct-current resistance testing device, the direct-current resistance can be smoothly and accurately tested under the relative interference voltage 350V or inter-phase interference voltage 100V.

Description

Anti-interference direct current resistance proving installation
Technical field
The utility model relates to a kind of power equipment proving installation, relates in particular to a kind of anti-interference direct current resistance proving installation, is 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 the 350V left and right, and voltage between phases can reach the 100V left and right.
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 is also the Main Basis of estimating the line construction quality, but because of line influence voltage high, instrument for measuring DC resistance with routine, as double bridge, digital direct current resistance meter, can't complete the test of circuit direct current resistance at all, the serious deviation of test data often occur, instrument damage and human body electrification accident even 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 utility model is for 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 and to have completed the test of circuit direct current resistance in the prior art, the serious deviation of test data often occurs, the problem of instrument damage and human body electrification accident even occurs.
The technical solution of the utility model 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 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 process dividing potential drop in simulating signal, overvoltage protection, then amplify buffering through operational amplifier and give the AD analog converter that gathers voltage, then process by analysis, obtain 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.
The utility model has the advantages of for, 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 rectification, interference voltage is divided melt, only measure at last DC component, reach the purpose of testing smoothly direct current resistance under interference voltage, 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 test figure purpose accurately.
5, practical, applied range.
Description of drawings
Fig. 1 is the utility model one-piece construction schematic block diagram.
Fig. 2 is the theory structure block diagram of the utility model dc constant voltage constant current source.
Fig. 3 is the utility model data test computing unit theory structure block diagram.
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 the adjustment of programmed control digital regulation resistance to control the DC voltage amplitude and 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 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 isolation fully by the high speed optoelectronic coupling.Voltage signal process dividing potential drop in simulating signal, overvoltage protection, then amplify buffering through operational amplifier and give 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 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; Control output voltage, current value in order to the resistance of adjusting the 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)
The utility model antijamming capability 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 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 process dividing potential drop in simulating signal, overvoltage protection, then amplify buffering through operational amplifier and give the AD analog converter that gathers voltage, then process by analysis, obtain 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.
CN 201220662353 2012-12-05 2012-12-05 Anti-interference direct-current resistance testing device Expired - Fee Related CN202939224U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220662353 CN202939224U (en) 2012-12-05 2012-12-05 Anti-interference direct-current resistance testing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220662353 CN202939224U (en) 2012-12-05 2012-12-05 Anti-interference direct-current resistance testing device

Publications (1)

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CN202939224U true CN202939224U (en) 2013-05-15

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102981058A (en) * 2012-12-05 2013-03-20 辽宁省电力有限公司抚顺供电公司 Anti-interference direct current resistance testing device
CN106170164A (en) * 2016-07-01 2016-11-30 上海铁路车辆工贸有限公司淮南分公司 A kind of novel rail LED light source illuminating lamp
CN107884624A (en) * 2017-12-28 2018-04-06 国家电网公司 Transmission line of electricity anti-interference direct current resistance test device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102981058A (en) * 2012-12-05 2013-03-20 辽宁省电力有限公司抚顺供电公司 Anti-interference direct current resistance testing device
CN106170164A (en) * 2016-07-01 2016-11-30 上海铁路车辆工贸有限公司淮南分公司 A kind of novel rail LED light source illuminating lamp
CN107884624A (en) * 2017-12-28 2018-04-06 国家电网公司 Transmission line of electricity anti-interference direct current resistance test device

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GR01 Patent grant
C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130515

Termination date: 20181205

CF01 Termination of patent right due to non-payment of annual fee