CN102981058B - Anti-interference direct current resistance testing device - Google Patents
Anti-interference direct current resistance testing device Download PDFInfo
- Publication number
- CN102981058B CN102981058B CN201210514937.1A CN201210514937A CN102981058B CN 102981058 B CN102981058 B CN 102981058B CN 201210514937 A CN201210514937 A CN 201210514937A CN 102981058 B CN102981058 B CN 102981058B
- Authority
- 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.)
- Active
Links
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 238000001914 filtration Methods 0.000 claims description 22
- 238000005259 measurement Methods 0.000 claims description 14
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 claims description 5
- 230000003139 buffering effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000005693 optoelectronics Effects 0.000 claims description 3
- 230000016507 interphase Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
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, particularly relate 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 power construction development, 66kV and Above Transmission Lines are joint used and are on the increase with scissors crossing, and the induced voltage causing transmission line of electricity mutual is 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 the basic data in order to check circuit crimp head quality and circuit distance fault location, also be the Main Basis evaluating line construction quality, but because line influence voltage is high, with the instrument for measuring DC resistance of routine, as double bridge, digital direct current resistance meter, the test of circuit direct current resistance cannot be completed at all, often occur test data severe deviations, even instrument damage and human body electrification accident occur.Direct current resistance test event cannot be carried out so far in this area under strong jamming voltage, but 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 of satisfied 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, harmonic analysis method is adopted to realize the parameter measurement of high-tension line direct current resistance, solve the test that cannot complete circuit direct current resistance in prior art, often there is test data severe deviations, the problem of instrument damage and human body electrification accident even occurs.
Technical scheme of the present invention is as follows:
DC constant voltage constant current source is connected with impedance matching unit; Impedance matching unit and data test computing unit are connected with measuring resistance and measured resistance sampling unit, relay contact analog control system motor unit and interference voltage detecting unit respectively; 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, EMI filter 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, according to the AC influence voltage magnitude size detected, is selected in different resistance value series connection access test loops.
Described data test computing unit is that electric pressure converter is connected with photoisolator by OR circuit 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 coupled by high speed optoelectronic and isolate; Voltage signal in simulating signal through dividing potential drop, overvoltage protection, then amplify buffering through operational amplifier and give and gather the AD analog converter of voltage, then process by analysis, the data required for acquisition.
Described measuring resistance and measured resistance sampling unit comprise voltage measurement collecting unit; voltage measurement collecting unit is; superpotential input protection control module connects constant-current source output module; constant-current source output module connects AC influence decrease uptake filtration module; the impedance of AC influence decrease uptake filtration module matching connection; matched impedance connects test line resistance, test line resistance connection standard resistance, and measuring resistance connects AC influence decrease uptake filtration module.
Described voltage measurement collecting unit adopts U1, U2, U3 tri-road voltage tester passage, DC voltage electrode, the negative pole of U1 fixing test standard resistor at two terminals; U2 tests the negative pole of measured resistance, the negative pole of measuring resistance; U3 tests the positive pole of measured resistance, the negative pole of measuring resistance.
Advantageous effect of the present invention is, adopts harmonic analysis method to realize the parameter measurement of high-tension line direct current resistance.Because installed the structures such as impedance matching unit, after a series of filtering, isolation and rectification, interference voltage is divided and melts, finally only measure DC component, reach the object of test direct current resistance smoothly under interference voltage, concrete feature is 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 be there is in 3, test connection safety convenient.
4, significantly improve antijamming capability, reach test figure object accurately.
5, practical, applied range.
Accompanying drawing explanation
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, DC constant voltage constant current source is connected with impedance matching unit; Impedance matching unit and data test computing unit are connected with measuring resistance and measured resistance sampling unit, relay contact analog control system motor unit and interference voltage detecting unit respectively; 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, EMI filter 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 DC voltage amplitude and ensure that power supply is according to rated power output voltage, electric current as far as possible, improve signal to noise ratio (S/N ratio).
Described impedance matching unit, according to the AC influence voltage magnitude size that instrument detects, selects in different resistance value series connection access test loops, for effectively reducing the object that interference voltage affects direct current signal.
As shown in Figure 3, described data test computing unit is that electric pressure converter is connected with photoisolator by OR circuit 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, can ensure again the safety of the staff of operating instrument, and analog switched power supply and digital switch power supply realize completely isolated by high speed optoelectronic coupling.Voltage signal in simulating signal through dividing potential drop, overvoltage protection, then amplify buffering through operational amplifier and give and gather the AD of voltage.Process by analysis again, the data required for acquisition.
As shown in Figure 4; described measuring resistance and measured resistance sampling unit comprise voltage measurement collecting unit; voltage measurement collecting unit is; superpotential input protection control module connects constant-current source output module; constant-current source output module connects AC influence decrease uptake filtration module, the impedance of AC influence decrease uptake filtration module matching connection, and matched impedance connects test line resistance; test line resistance connection standard resistance, measuring resistance connects AC influence decrease uptake filtration module.
Voltage measurement adopts three independently test channel, can improve sample rate, both can avoid the signal disturbing between voltage, can also reduce the asynchronous problem that voltage and current signal gathers.
Voltage tester passage is totally 3 tunnels, U1, U2, U3, and a bit altogether, i.e. the negative pole of measuring resistance, corresponding test point is see Fig. 4 for DC voltage measurement.
U1: the DC voltage+pole of fixing test standard resistor at two terminals ,-pole; Measuring current value is obtained divided by measuring resistance value by test voltage; Resistance in order to adjust numerical value potentiometer controls output voltage, current value.
U2: test measured resistance-pole, measuring resistance-pole; As intermediate variable, by U3-U2=Uk and measured resistance, try to achieve tested DC resistance with measuring resistance U1.
U3: test measured resistance+pole, measuring resistance-pole.
Test resistance computing formula:
Total value: Rxx=Rb × ((U3-U2)/U1)
Every kilometer of 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; Under outside has 5 ~ 100V Hz noise voltage: reach 0.5 grade.
Claims (1)
1. anti-interference direct current resistance proving installation, is characterized in that DC constant voltage constant current source is connected with impedance matching unit; Impedance matching unit and data test computing unit are connected with measuring resistance and measured resistance sampling unit, relay contact analog control system motor unit and interference voltage detecting unit respectively; 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, EMI filter 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, according to the AC influence voltage magnitude size detected, is selected in different resistance value series connection access test loops; Described data test computing unit is that electric pressure converter is connected with photoisolator by OR circuit 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 coupled by high speed optoelectronic and isolate; Voltage signal in simulating signal through dividing potential drop, overvoltage protection, then amplify buffering through operational amplifier and give and gather the AD analog converter of voltage, then process by analysis, the data required for acquisition; Described measuring resistance and measured resistance sampling unit comprise voltage measurement collecting unit, voltage measurement collecting unit is, superpotential input protection control module connects constant-current source output module, constant-current source output module connects AC influence decrease uptake filtration module, the impedance of AC influence decrease uptake filtration module matching connection, matched impedance connects test line resistance, test line resistance connection standard resistance, and measuring resistance connects AC influence decrease uptake filtration module; Described voltage measurement collecting unit adopts U1, U2, U3 tri-road voltage tester passage, DC voltage electrode, the negative pole of U1 fixing test standard resistor at two terminals; U2 tests the negative pole of measured resistance, the negative pole of measuring resistance; U3 tests the positive pole of measured resistance, the negative pole of measuring resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210514937.1A CN102981058B (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 |
|---|---|---|---|
| CN201210514937.1A CN102981058B (en) | 2012-12-05 | 2012-12-05 | Anti-interference direct current resistance testing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102981058A CN102981058A (en) | 2013-03-20 |
| CN102981058B true CN102981058B (en) | 2015-03-11 |
Family
ID=47855266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210514937.1A Active CN102981058B (en) | 2012-12-05 | 2012-12-05 | Anti-interference direct current resistance testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102981058B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293385B (en) * | 2013-05-14 | 2016-03-02 | 国家电网公司 | Transformer temperature rise test quick test device for direct-current resistance |
| EP2944967B1 (en) * | 2014-05-15 | 2020-08-05 | ABB Schweiz AG | 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 |
| CN111693779A (en) * | 2020-06-19 | 2020-09-22 | 珠海市运泰利自动化设备有限公司 | High-precision measuring system for ultrahigh impedance of low-voltage device |
| 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 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2508252Y (en) * | 2001-11-23 | 2002-08-28 | 贺明志 | Electric wire and cable AC resistance tester |
| JP2003232822A (en) * | 2002-02-07 | 2003-08-22 | Deicy Corp | Resistivity measuring method by four probe method and its device |
| CN101034117B (en) * | 2007-04-02 | 2010-05-19 | 武汉大学 | Power transmission line power frequency parameters measuring method and device |
| CN201397363Y (en) * | 2009-04-09 | 2010-02-03 | 华中电网有限公司 | Device for measuring direct-current resistance of strong coupling transmission line |
| CN201773131U (en) * | 2009-12-14 | 2011-03-23 | 山西省电力公司晋中供电分公司 | Anti-interference device for direct-current resistance measurement of power transmission lines with voltage higher than 110kV |
| CN201607488U (en) * | 2009-12-31 | 2010-10-13 | 上海市电力公司 | DC resistance measuring device of ultra-high-voltage transmission line |
| CN102590673A (en) * | 2012-02-24 | 2012-07-18 | 辽宁省电力有限公司抚顺供电公司 | Parameter tester for transmission line |
| CN202939224U (en) * | 2012-12-05 | 2013-05-15 | 辽宁省电力有限公司抚顺供电公司 | Anti-interference direct-current resistance testing device |
-
2012
- 2012-12-05 CN CN201210514937.1A patent/CN102981058B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102981058A (en) | 2013-03-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102981058B (en) | Anti-interference direct current resistance testing device | |
| CN103293443B (en) | A kind of distribution network overhead line Earth design method | |
| WO2015117304A1 (en) | System for online monitoring of zinc oxide arrester and method thereof | |
| CN102135571B (en) | Anti-interference measurement method for zero sequence impedance of super-high-voltage/ultrahigh-voltage multi-loop power transmission line | |
| CN104678341A (en) | Detection device and detection method for station-dedicated DC power system insulation monitoring device | |
| WO2012059061A1 (en) | Method and device for quality-monitoring of high-voltage electrical energy | |
| CN101592701A (en) | Direct-current voltage withstanding test method for multilevel zinc oxide lightning arresters | |
| EP3918350B1 (en) | Current and voltage measuring unit | |
| CN202939224U (en) | Anti-interference direct-current resistance testing device | |
| CN101299385A (en) | Electron type current transformer for ultrahigh voltage transmission lines and corona loss measurement device thereof | |
| CN101887085B (en) | Zinc oxide arrester DC characteristic testing device and method | |
| CN202141752U (en) | Online monitoring device for metal zinc oxide lightning arrester | |
| CN204515113U (en) | Stand with the pick-up unit of DC power system insulation monitoring and warning device | |
| CN205539204U (en) | Frequency conversion earth impedance measuring apparatu | |
| CN104034977B (en) | Capacitance type potential transformer live detection instrument | |
| CN203405561U (en) | Direct current power source grounding fault searching device | |
| CN204101663U (en) | Lightning arrester with electrical testing meter | |
| CN218546873U (en) | Insulation resistance tester based on capacitance partial pressure restraines induced voltage | |
| CN103777064A (en) | Zinc oxide arrester live detection device free of external connection with alternating-current power supply | |
| CN203949980U (en) | The charged detector of capacitance type potential transformer | |
| CN104375031A (en) | On-line measurement device for power supply system surge protection device insulation resistance | |
| CN213302497U (en) | Current transformer secondary side loop detection device and circuit | |
| CN103630763A (en) | Alternating-current power supply three-phase unbalanced drop simulator and simulation method | |
| CN105572489A (en) | Live-line tester for lightning arrester | |
| CN204333937U (en) | Detect the intellectualized detection device based on the intellectualized switchgear one-phase ground protection function of 10kV isolated neutral distribution network systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |