CN109100591B - Overhead line comprehensive tester - Google Patents
Overhead line comprehensive tester Download PDFInfo
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- CN109100591B CN109100591B CN201810853422.1A CN201810853422A CN109100591B CN 109100591 B CN109100591 B CN 109100591B CN 201810853422 A CN201810853422 A CN 201810853422A CN 109100591 B CN109100591 B CN 109100591B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention relates to an overhead line comprehensive tester, which has the structure that: the working mode selection module is connected with the constant current source module, the constant voltage source module and the induced voltage meter module; the constant current source module is connected with the control module 1, and the constant voltage source module and the induction voltmeter module are connected with the control module 2; the control module 1 and the control module 2 are connected with a wiring terminal, and the wiring terminal is connected with the signal acquisition module 1 and the signal acquisition module 2; the signal acquisition module 1 and the signal acquisition module 2 are connected with the analog-to-digital conversion module; the analog-to-digital conversion module is connected with the display module. The invention integrates multiple functions, integrates the induction voltage measurement, direct current resistance measurement, insulation resistance measurement and nuclear phase function of the overhead line, simplifies the test process and improves the working efficiency.
Description
Technical Field
The invention relates to a power line tester, in particular to an overhead line comprehensive tester.
Background
The method is characterized in that the line phase checking is needed after the construction of the line, and the line phase checking, the insulation resistance, the induced voltage, the direct current resistance and other tests are needed before the new line is put into operation. The line phase checking test is to check whether phase sequence phases at two ends of a line correspond to each other; the line insulation resistance test is used for testing the insulation levels of line phases, lines and towers and lines to the ground; the induced voltage test is to measure the induced voltage of the line erected on the same tower or adjacent lines; the direct current resistance test of the line is used for detecting whether the line has faults or hidden dangers such as short circuit, poor contact and the like, and the four tests are very important for the safe and stable operation of the overhead line.
However, the current testing methods have some problems.
First, the test instrument of cubic needs to be changed in four experiments, needs to change the experimental wiring of cubic, and very loaded down with trivial details inconvenience.
Secondly, because often change test wiring and test instrument, can cause very big potential safety hazard for the testing personnel. Firstly, for nuclear phase and insulation resistance measurement, firstly, an overhead line belongs to capacitive equipment, and direct current generated by an insulation resistance meter can cause the capacitive equipment to store a large amount of charges; secondly, if the adjacent line near the line framework which has been powered off has no power off or the line of the same tower framework has no power off, sudden induced voltage can hurt people, and especially when the test is carried out on the line with the voltage of above 220kV, the induced voltage is very obvious and the energy is very large. For the direct current resistance measurement of the overhead line, because the wiring needs to be replaced for three times, the potential danger that people are injured by induced electricity exists when the wiring is replaced every time, and accidents in the power grid are still endless; and test data also needs manual processing and conversion, so that the efficiency is low and the accuracy is poor.
In order to avoid injury to people by residual charges and induced voltages, the traditional method is to discharge leads of a three-phase line respectively after each test is completed, potential risks are increased inevitably when people directly contact the leads of the line with a large amount of residual charges and potential induced voltages, safety accidents can be caused if the people carelessly do not work, new induced electricity can be generated instantaneously if adjacent intervals of the tested line or the line suddenly fluctuates in current and voltage after discharge, and the risk of operators is increased due to uncertainty.
Various defects of the traditional test method are increasingly highlighted, so that the research on a new method and the development of a new means are imperative.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an overhead line comprehensive tester, which integrates the functions of overhead line induction voltage measurement, direct current resistance measurement, insulation resistance measurement and phase checking, meets the test precision, greatly simplifies the test process and improves the working efficiency; and the procedures of threatening personal safety such as frequent wire replacement, manual discharge and the like are avoided in the test process, so that the whole set of test is safer and more controllable.
The technical scheme of the invention is as follows:
the overhead line comprehensive tester comprises a working mode selection module, a constant current source module, a constant voltage source module, an induced voltage meter module, a control module 1, a control module 2, a wiring terminal, a signal acquisition module 1, a signal acquisition module 2, an analog-to-digital conversion module and a display module, wherein the working mode selection module is connected with the constant current source module, the constant voltage source module and the induced voltage meter module; the constant current source module is connected with the control module 1, and the constant voltage source module and the induction voltmeter module are connected with the control module 2; the control module 1 and the control module 2 are connected with a wiring terminal, and the wiring terminal is connected with the signal acquisition module 1 and the signal acquisition module 2; the signal acquisition module 1 and the signal acquisition module 2 are connected with the analog-to-digital conversion module; the analog-to-digital conversion module is connected with the display module.
The working mode selection module gives out a corresponding driving signal according to the test requirement, if the direct current resistance is measured, the constant current source module is driven, the control module 1 works in a matched mode, and meanwhile the signal acquisition module 1 acquires the corresponding signal; if the nuclear phase and insulation resistance measurement is carried out, the constant voltage source module is driven, the control module 2 works in a matching way, and meanwhile, the signal acquisition module 2 acquires corresponding signals; if the nuclear phase and insulation resistance measurement is carried out, the constant voltage source module is driven, and the control module 2 works in a matching way; the signal acquisition module 1, the signal acquisition module 2 and the induction voltmeter transmit the acquired corresponding signals to the analog-to-digital conversion module to digitize the electric signals, and then the electric signals are displayed on corresponding hardware by the display module.
The working mode selection module is a programmable singlechip.
The invention has the following advantages and effects:
(1) the measurement of the direct current resistance is changed from a four-wire system measurement method to a six-terminal measurement method, the accuracy of measuring the resistance (especially low resistance) is improved, and the wires do not need to be replaced when the three-phase direct current resistance is measured. And the line resistance can be automatically converted to the phase resistance.
(2) The direct current megohmmeter for nuclear phase adopts a stable direct current high voltage source and utilizes a single chip microcomputer to realize automatic control.
(3) The multifunctional integrated tester integrates multiple functions, integrates the functions of overhead line induced voltage measurement, direct current resistance measurement, insulation resistance measurement and nuclear phase measurement, simplifies the test process and improves the working efficiency.
(4) The instrument avoids the processes of threatening personal safety such as frequent wire replacement, manual discharge and the like in the test process.
(5) The current source for measuring the direct current resistance and the voltage source for measuring the insulation resistance and the nuclear phase are selected according to the approximate test parameter range of the overhead line, so that the structure of the instrument is simplified, and the manufacturing cost is reduced.
Drawings
FIG. 1 is a block diagram schematically illustrating the structure of the present invention.
Fig. 2 is a schematic diagram of the circuit principle of the invention for measuring the direct current resistance.
FIG. 3 is a schematic diagram of the circuit principle for measuring insulation resistance, nuclear phase and induced voltage according to the present invention.
Detailed Description
Examples
As shown in fig. 1, the overhead line comprehensive tester includes a working mode selection module, a constant current source module, a constant voltage source module, an induced voltage meter module, a control module 1, a control module 2, a connection terminal, a signal acquisition module 1, a signal acquisition module 2, an analog-to-digital conversion module and a display module, wherein the working mode selection module is connected with the constant current source module, the constant voltage source module and the induced voltage meter module; the constant current source module is connected with the control module 1, and the constant voltage source module and the induction voltmeter module are connected with the control module 2; the control module 1 and the control module 2 are connected with a wiring terminal, and the wiring terminal is connected with the signal acquisition module 1 and the signal acquisition module 2; the signal acquisition module 1 and the signal acquisition module 2 are connected with the analog-to-digital conversion module; the analog-to-digital conversion module is connected with the display module.
The working mode selection module gives out a corresponding driving signal according to the test requirement, if the direct current resistance is measured, the constant current source module is driven, the control module 1 works in a matched mode, and meanwhile the signal acquisition module 1 acquires the corresponding signal; if the nuclear phase and insulation resistance measurement is carried out, the constant voltage source module is driven, the control module 2 works in a matching way, and meanwhile, the signal acquisition module 2 acquires corresponding signals; if the nuclear phase and insulation resistance measurement is carried out, the constant voltage source module is driven, and the control module 2 works in a matching way; the signal acquisition module 1, the signal acquisition module 2 and the induction voltmeter transmit the acquired corresponding signals to the analog-to-digital conversion module to digitize the electric signals, and then the electric signals are displayed on corresponding hardware by the display module.
The working mode selection module is a programmable singlechip; the constant current source module is a current source capable of outputting different constant currents; the constant voltage source module is a voltage source capable of outputting different constant voltages; the induction voltmeter module is an induction voltmeter with proper and variable measuring range; after the current source is connected, the control module 1 switches on and off the internal switches according to a certain logic sequence, and then the six-terminal direct current resistance measurement can be realized; the signal acquisition modules 1 and 2 can respectively acquire voltage and current signals in the control modules 1 and 2; the digital-to-analog conversion module can carry out digital conversion according to voltage and current signals input by the two acquisition modules, carries out corresponding logic conversion to obtain a test result, and finally displays the test result through the display module.
The test for measuring dc resistance according to the present invention is shown in fig. 2, and a six-terminal lead method capable of sequentially measuring three-phase dc resistance without replacing the wires is formed.
As shown in FIG. 2, the terminals of the current source are connected to resistors respectivelyRLabel 1Resistance Rc+Resistance RLabel 2One terminal of (1), resistance RLabel 1Another end of the resistor R is connected with a resistor Ra+One terminal of (1), resistance RLabel 1And a resistance Ra+A switch S1a is arranged between; resistance RLabel 2Another end of the resistor R is connected with a resistor Rb+One terminal of (1), resistance RLabel 2And a resistance Rb+A switch S2a is arranged between; resistance Rc+The other ends of the two resistors are respectively connected with a resistor Ra+Another terminal of (1) and a resistor Rb+The other end of (1), the resistance Rc+Another terminal of (1) and a resistor Ra+A switch S23a and a resistor R are arranged between the other ends of the twoc+Another terminal of (1) and a resistor Rb+A switch S13a is provided between the other ends; the leading-out ends of the voltmeter 3 are respectively connected with the resistors Ra—Resistance Rb—Resistance Rc—One terminal of (1), resistance Ra—The other end of the first resistor is connected with a resistor R through a switch S1ba+Is connected to one end of a resistor Rx and a resistor Rb—The other end of the first resistor is connected with a resistor R through a switch S2bb+Is connected with the other end of the resistor Rx, and the resistor Rc—The other end of the resistor is connected to the two ends of the resistor Rx through a switch S23b and a switch S13b respectively; resistance RLabel 1Is connected with a voltmeter 1 at two ends, and a resistor RLabel 2Is connected with a voltmeter 2 at two ends, and a resistance R is measuredLabel 2The two ends of the voltmeter 2 are provided with a switch S3;
selective measurement of RABWhen the measurement is performed, the switches S1a, S1b, S2a, S2b and S3_ are closed, S3, S13a, S13b, S23a and S23b are all opened, and the measurement R is selectedCAWhen the switch is on, the switches S1a, S1b, S3, S13a and S13b are closed, and the switches S2a, S2b, S23a, S23b and S3_ are opened; selective measurement of RBCWhen the switch is turned off, S2a, S2b, S3, S23a and S23b are closed, and switches S1a, S1b, S13a, S13b and S3_ are opened.
In the measurement of RAB、RBC、RCAThen, the instrument system will automatically convert the three-wire resistance into the phase resistance RA、RB、RC。
Wherein A +, B +, C +, corresponding to Ai, Bi and Ci terminals, and A-, B-and C-corresponding to Au, Bu and Cu terminals.
The test for measuring insulation resistance, nuclear phase and induced voltage of the present invention is shown in fig. 3. When the insulation resistance or the nuclear phase is selected to be measured, a direct-current voltage source is connected; when the measurement of the induction voltage is selected, the induction voltage meter is accessed; if the phase A is selected to be measured, Ai and Au are accessed; B. and C, the same reason.
Claims (1)
1. A method for measuring direct current resistance by an overhead line comprehensive tester,
the overhead line comprehensive tester comprises a working mode selection module, a constant current source module, a constant voltage source module, an induced voltage meter module, a control module 1, a control module 2, a wiring terminal, a signal acquisition module 1, a signal acquisition module 2, an analog-to-digital conversion module and a display module, wherein the working mode selection module is connected with the constant current source module, the constant voltage source module and the induced voltage meter module; the constant current source module is connected with the control module 1, and the constant voltage source module and the induction voltmeter module are connected with the control module 2; the control module 1 and the control module 2 are connected with a wiring terminal, and the wiring terminal is connected with the signal acquisition module 1 and the signal acquisition module 2; the signal acquisition module 1 and the signal acquisition module 2 are connected with the analog-to-digital conversion module; the analog-to-digital conversion module is connected with the display module;
the working mode selection module gives out a corresponding driving signal according to the test requirement, if the direct current resistance is measured, the constant current source module is driven, the control module 1 works in a matched mode, and meanwhile the signal acquisition module 1 acquires the corresponding signal; if the nuclear phase and insulation resistance measurement is carried out, the constant voltage source module is driven, the control module 2 works in a matching way, and meanwhile, the signal acquisition module 2 acquires corresponding signals; if the nuclear phase and insulation resistance measurement is carried out, the constant voltage source module is driven, and the control module 2 works in a matching way; the signal acquisition module 1, the signal acquisition module 2 and the induction voltmeter transmit the acquired corresponding signals to the analog-to-digital conversion module to digitize the electric signals, and then the electric signals are displayed on corresponding hardware by the display module;
the working mode selection module is a programmable singlechip;
the method is characterized in that a six-terminal lead method is adopted for measuring the direct current resistance, and comprises the following steps:
the leading-out terminals of the current source are respectively connected with resistorsRLabel 1Resistance Rc+Resistance RLabel 2One terminal of (1), resistance RLabel 1Another end of the resistor R is connected with a resistor Ra+One terminal of (1), resistance RLabel 1And a resistance Ra+A switch S1a is arranged between; resistance RLabel 2Another end of the resistor R is connected with a resistor Rb+One terminal of (1), resistance RLabel 2And a resistance Rb+A switch S2a is arranged between; resistance Rc+The other ends of the two resistors are respectively connected with a resistor Ra+Another terminal of (1) and a resistor Rb+The other end of (1), the resistance Rc+Another terminal of (1) and a resistor Ra+Between the other ends of which is a switch S23a,
resistance Rc+Another terminal of (1) and a resistor Rb+A switch S13a is provided between the other ends;
the leading-out ends of the voltmeter 3 are respectively connected with the resistors Ra—Resistance Rb—Resistance Rc—One terminal of (1), resistance Ra—The other end of the first resistor is connected with a resistor R through a switch S1ba+Is connected to one end of a resistor Rx and a resistor Rb—The other end of the first resistor is connected with a resistor R through a switch S2bb+Is connected with the other end of the resistor Rx, and the resistor Rc—The other end of the resistor is connected to the two ends of the resistor Rx through a switch S23b and a switch S13b respectively; resistance RLabel 1Is connected with a voltmeter 1 at two ends, and a resistor RLabel 2Is connected with a voltmeter 2 at two ends, and a resistance R is measuredLabel 2The two ends of the voltmeter 2 are provided with a switch S3;
selective measurement of RABWhen the measurement is performed, the switches S1a, S1b, S2a, S2b and S3_ are closed, S3, S13a, S13b, S23a and S23b are all opened, and the measurement R is selectedCAWhen the switch is on, the switches S1a, S1b, S3, S13a and S13b are closed, and the switches S2a, S2b, S23a, S23b and S3_ are opened; selective measurement of RBCWhen the switch is turned off, S2a, S2b, S3, S23a and S23b are closed, and switches S1a, S1b, S13a, S13b and S3_ are opened.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810853422.1A CN109100591B (en) | 2018-07-30 | 2018-07-30 | Overhead line comprehensive tester |
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| CN201810853422.1A CN109100591B (en) | 2018-07-30 | 2018-07-30 | Overhead line comprehensive tester |
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| CN109100591B true CN109100591B (en) | 2021-04-20 |
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Citations (6)
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| CN203849294U (en) * | 2014-06-06 | 2014-09-24 | 国家电网公司 | Overhead line parameter measuring line connecting device |
| CN204515022U (en) * | 2015-04-14 | 2015-07-29 | 国网辽宁省电力有限公司抚顺供电公司 | Anti-interference transmission line of electricity high-voltage insulating resistance proving installation |
| CN104820177A (en) * | 2015-04-09 | 2015-08-05 | 中国电子科技集团公司第四十五研究所 | Probe switching control system and method for flying probe test |
| CN105974262A (en) * | 2016-04-28 | 2016-09-28 | 国网福建省电力有限公司 | Intelligent cable phase verification instrument capable of maintaining normal communication in no-signal environment |
| CN206440769U (en) * | 2017-02-20 | 2017-08-25 | 浙江舟山启明电力集团公司电力安装公司 | Transformer is without neutral point side instrument for measuring DC resistance |
| CN207181527U (en) * | 2017-09-05 | 2018-04-03 | 河北如电电气设备有限公司 | A kind of DCR of Transformer and no-load voltage ratio test synthesis instrument |
-
2018
- 2018-07-30 CN CN201810853422.1A patent/CN109100591B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203849294U (en) * | 2014-06-06 | 2014-09-24 | 国家电网公司 | Overhead line parameter measuring line connecting device |
| CN104820177A (en) * | 2015-04-09 | 2015-08-05 | 中国电子科技集团公司第四十五研究所 | Probe switching control system and method for flying probe test |
| CN204515022U (en) * | 2015-04-14 | 2015-07-29 | 国网辽宁省电力有限公司抚顺供电公司 | Anti-interference transmission line of electricity high-voltage insulating resistance proving installation |
| CN105974262A (en) * | 2016-04-28 | 2016-09-28 | 国网福建省电力有限公司 | Intelligent cable phase verification instrument capable of maintaining normal communication in no-signal environment |
| CN206440769U (en) * | 2017-02-20 | 2017-08-25 | 浙江舟山启明电力集团公司电力安装公司 | Transformer is without neutral point side instrument for measuring DC resistance |
| CN207181527U (en) * | 2017-09-05 | 2018-04-03 | 河北如电电气设备有限公司 | A kind of DCR of Transformer and no-load voltage ratio test synthesis instrument |
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Inventor after: Hou Nianting Inventor after: Wang Yuanyu Inventor after: Lv Zhiying Inventor after: Yin Zhiwei Inventor after: Pang Yuwei Inventor after: Tian Ye Inventor after: Tan Ying Inventor after: Lv Shuming Inventor after: Xu Lihua Inventor after: Xu Yan Inventor after: Xue Huinan Inventor before: Hou Nianting Inventor before: Wang Yuanyu Inventor before: Lv Zhiying Inventor before: Yin Zhiwei Inventor before: Pang Yuwei Inventor before: Tian Ye Inventor before: Tan Ying Inventor before: Lv Shuming Inventor before: Xu Lihua Inventor before: Xu Yan Inventor before: Xue Huinan |
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