CN103837743A - Resistance measuring device of circuit breaker with voltage dependent resistor - Google Patents
Resistance measuring device of circuit breaker with voltage dependent resistor Download PDFInfo
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- CN103837743A CN103837743A CN201310574367.XA CN201310574367A CN103837743A CN 103837743 A CN103837743 A CN 103837743A CN 201310574367 A CN201310574367 A CN 201310574367A CN 103837743 A CN103837743 A CN 103837743A
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Abstract
The invention relates to a resistance measuring device of a circuit breaker with a voltage dependent resistor. The resistance measuring device comprises a measuring terminal connected with the output end of the circuit breaker with the voltage dependent resistor, and a voltage and current sensor connected with the measuring terminal and used for transmitting inducted voltage and current results to an analog-digital conversion module. The analog-digital conversion module outputs digits to a processor and outputs the value of the resistance of an opening coil circuit and the value of the resistance of a closing coil circuit. A direct current power supply can be adjusted for more than two times. The resistance measuring device is simple and practical, can be used for directly measuring the value of the resistance of the opening coil circuit and the value of the resistance of the closing coil circuit, can discover the deterioration degree of the breaker circuit timely, can make maintenance strategies timely, and ensures the safety of a power grid.
Description
Technical field
The present invention relates to the technical field of electronic component parameter measuring apparatus, specifically a kind of electric resistance measuring apparatus of the isolating switch containing voltage dependent resistor (VDR).
Background technology
Isolating switch divides, closing coil loop resistance is to characterize that isolating switch divides, the important state device of components and parts contact condition and degradation in closing coil, closely bound up with the minimum voltage action of isolating switch, in repair based on condition of component, to judge circuit-breaker status, formulate the important evidence of overhaul of line breaker strategy, therefore in the time carrying out circuit breaker characteristic test, must measure, to analyze judgement.
The resistance that need to measure containing the isolating switch of voltage dependent resistor (VDR) mainly comprises point, the loop resistance of closing coil and the voltage dependent resistor (VDR) of voltage dependent resistor (VDR) module.But for the isolating switch that contains voltage dependent resistor (VDR), because the resistance of voltage dependent resistor (VDR) is in certain range of current, resistance changes along with the variation of magnitude of voltage, therefore carrying out circuit breaker characteristic when test, conventional ohmmeter measure cannot measure containing the isolating switch of voltage dependent resistor (VDR) divide, the loop resistance of closing coil.
Summary of the invention
Technical matters to be solved by this invention is the isolating switch that contains voltage dependent resistor (VDR) of prior art, because the resistance of voltage dependent resistor (VDR) is in certain range of current, resistance changes along with the variation of magnitude of voltage, therefore in the time carrying out circuit breaker characteristic test, conventional ohmmeter measure cannot measure containing the isolating switch of voltage dependent resistor (VDR) point, the technical matters of the loop resistance value of closing coil, design for the isolating switch that contains voltage dependent resistor (VDR) thereby provide a kind of, can directly measure isolating switch point, the electric resistance measuring apparatus of the loop resistance of closing coil.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
An electric resistance measuring apparatus that contains the isolating switch of voltage dependent resistor (VDR), comprising:
Calibrating terminal, is connected with the isolating switch output terminal containing voltage dependent resistor (VDR);
Voltage and current sensor, is connected with described calibrating terminal, for responding to the voltage and current of the outside input that described isolating switch receives, and induction result is sent to analog-to-digital conversion module;
Analog-to-digital conversion module, is connected with voltage and current sensor, for the described voltage and current induction result receiving is carried out to analog to digital conversion, and output digit signals;
Adjustable direct supply, is connected with calibrating terminal respectively, is used to described voltage and current sensor, described analog-to-digital conversion module, described calibrating terminal and the power supply of described processor, and wherein said adjustable direct supply at least regulates more than twice;
Processor, is connected with described analog-to-digital conversion module, and the digital signal transmitting for the treatment of described analog-to-digital conversion module is also calculated, and output containing the isolating switch of voltage dependent resistor (VDR) point, the resistance of closing coil loop resistance.
Also comprise;
Holding circuit, described holding circuit comprises direct supply holding circuit and the current-limiting protection circuit of prescribing a time limit, for cutting off the electricity supply in the time that adjustable direct supply electric voltage exception raises.
Described adjustable direct supply comprises AC power, inner transtat and the rectification module of outside access, and described inner transtat and rectification module are for changing into inner available direct supply by the described AC power of outside access.
The available direct supply in described inside comprises test direct supply and non-test direct supply, and described test is connected with described calibrating terminal with direct supply, and described non-test is connected with described analog-to-digital conversion module with described processor with direct supply
Described calibrating terminal comprises voltage tester terminal and testing current terminal.
Also comprise:
Human-computer interaction interface, is connected with described processor, for the resistance value of video-stream processor output.
Also comprise:
Printer, is connected with described processor, for printing the resistance value of described processor output.
Technique scheme of the present invention has the following advantages compared to existing technology:
(1) electric resistance measuring apparatus of the present invention, obtain the voltage and current containing the isolating switch two ends of voltage dependent resistor (VDR) by calibrating terminal, go out voltage and current by voltage and current sensor sensing, and be sent to analog-to-digital conversion module and carry out analog to digital conversion, and output digit signals is to processor, by processor output containing the isolating switch of voltage dependent resistor (VDR) point, the resistance of closing coil loop resistance, wherein adjustable direct supply at least regulates more than twice; Utilize statistical method, repeatedly regulate adjustable direct supply, can draw the voltage dependent resistor (VDR) value under different voltage, thereby obtain the U-R family curve of voltage dependent resistor (VDR), thereby processor can calculate point, the loop resistance value of closing coil, directly output point, the loop resistance value of closing coil, the present invention is a kind of simple and practical measurement mechanism, can directly measure point, the loop resistance value of closing coil, find in time the degradation of isolating switch, formulate in time Strategies of Maintenance, ensure power grid security.
(2) electric resistance measuring apparatus of the present invention, also comprises holding circuit, for cutting off the electricity supply in the time that adjustable direct supply electric voltage exception raises, effectively avoids electric resistance measuring apparatus to damage; Finger-impu system, is connected with described processor, for input measurement parameter, in the time that internal measurement parameter need to change, can utilize easily keyboard to reset; Human-computer interaction interface and printer, can show and print the resistance value of processor output intuitively.
Accompanying drawing explanation
For content of the present invention is more likely to be clearly understood, below in conjunction with accompanying drawing, the present invention is further detailed explanation, wherein,
Fig. 1 is the circuit diagram of the electric resistance measuring apparatus of the isolating switch containing voltage dependent resistor (VDR) of embodiment mono-of the present invention;
Fig. 2 is the circuit diagram of the electric resistance measuring apparatus of the isolating switch containing voltage dependent resistor (VDR) of embodiment bis-of the present invention.
Embodiment
As shown in Figure 1, it comprises the circuit diagram of the electric resistance measuring apparatus of the isolating switch containing voltage dependent resistor (VDR) of the present invention:
Calibrating terminal, is connected with the isolating switch output terminal containing voltage dependent resistor (VDR);
Voltage and current sensor, is connected with described calibrating terminal, for responding to the voltage and current of the outside input that described isolating switch receives, and induction result is sent to analog-to-digital conversion module;
Analog-to-digital conversion module, is connected with voltage and current sensor, for the described voltage and current induction result receiving is carried out to analog to digital conversion, and output digit signals;
Adjustable direct supply, is connected with calibrating terminal respectively, is used to described voltage and current sensor, described analog-to-digital conversion module, described calibrating terminal and the power supply of described processor, and wherein said adjustable direct supply at least regulates more than twice;
Processor, is connected with described analog-to-digital conversion module, and the digital signal transmitting for the treatment of described analog-to-digital conversion module is also calculated, and output containing the isolating switch of voltage dependent resistor (VDR) point, the resistance of closing coil loop resistance.
Groundwork principle of the present invention is along with the variation of voltage changes according to the resistance of voltage dependent resistor (VDR), and the resistance of loop resistance is steady state value, thereby utilize statistical method, repeatedly regulate adjustable direct supply, obtain the voltage dependent resistor (VDR) under different voltage and divide, closing coil loop resistance value sum, thereby can draw the U-R family curve of voltage dependent resistor (VDR), obtain the voltage dependent resistor (VDR) value under specific voltage, thereby calculate point, the loop resistance value of closing coil, directly output point, the loop resistance value of closing coil, the present invention is one measurement mechanism very intuitively, can directly measure point, the loop resistance value of closing coil, find in time the degradation of isolating switch, formulate in time Strategies of Maintenance, ensure power grid security.
In the present embodiment, described adjustable direct supply comprises AC power, inner transtat and the rectification module of outside access, and described inner transtat and rectification module are for changing into inner available direct supply by the described AC power of outside access.
Further, the available direct supply in described inside comprises test direct supply and non-test direct supply, described test is connected with described calibrating terminal with direct supply, and described non-test is connected with described analog-to-digital conversion module with described processor with direct supply.The characteristic changing along with change in voltage according to the resistance of voltage dependent resistor (VDR), adopt adjustable direct supply, test is wherein regulated more than at least twice with direct supply, the more measurements of number of times that regulate are more accurate, thereby obtain different magnitudes of voltage, measure the voltage dependent resistor (VDR) value under different voltage and divide according to different magnitudes of voltage again, the loop resistance value sum of closing coil, thereby determine the U-R family curve of voltage dependent resistor (VDR), according to the voltage dependent resistor (VDR) value under a certain voltage recording before and point, the loop resistance value sum of closing coil, deduct the voltage dependent resistor (VDR) value under this voltage, just determine point, the loop resistance value of closing coil.
Described calibrating terminal comprises voltage tester terminal and testing current terminal.Obtained the voltage and current at described isolating switch two ends by voltage and current sensor, according to voltammetry, can draw resistance value sum in isolating switch, deduct the resistance of known resistance, be unknown resistance resistance and, namely voltage dependent resistor (VDR) value and point, the loop resistance value of closing coil.
It will be understood by those skilled in the art that the analog-to-digital conversion module described in the technical program is by being realized by analog to digital conversion circuit, but not software approach is realized.
In the present embodiment, also comprise holding circuit, described holding circuit comprises direct supply holding circuit and the current-limiting protection circuit of prescribing a time limit, for cutting off the electricity supply in the time that adjustable direct supply electric voltage exception raises.It will be appreciated by those skilled in the art that this is a kind of technological means of routine, for cutting off the electricity supply in the time that adjustable direct supply electric voltage exception raises, effectively avoid electric resistance measuring apparatus to damage, in this not go into detail.
Embodiment bis-:
The present invention containing the structural representation of the electric resistance measuring apparatus of the isolating switch of voltage dependent resistor (VDR) as shown in Figure 2.On the basis of embodiment mono-, also comprise:
Finger-impu system, is connected with described processor, for input measurement parameter.Described measurement parameter comprises the output voltage while measurement, for example, while measuring output voltage, can carry out step-by-step adjustment, can raise or reduce by 5 volts at every turn.Described measurement parameter can also comprise length of testing speech, and described length of testing speech refers to the time span of internal electric source output function voltage, can select different measurement durations according to different operations.
Human-computer interaction interface, is connected with described processor, for the resistance value of video-stream processor output.
Printer, is connected with described processor, for printing the resistance value of described processor output.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also giving exhaustive to all embodiments.And the apparent variation of being extended out thus or variation are still among the protection domain in the invention.
Claims (7)
1. an electric resistance measuring apparatus that contains the isolating switch of voltage dependent resistor (VDR), is characterized in that, comprising:
Calibrating terminal, is connected with the isolating switch output terminal containing voltage dependent resistor (VDR);
Voltage and current sensor, is connected with described calibrating terminal, for responding to the voltage and current of the outside input that described isolating switch receives, and induction result is sent to analog-to-digital conversion module;
Analog-to-digital conversion module, is connected with voltage and current sensor, for the described voltage and current induction result receiving is carried out to analog to digital conversion, and output digit signals;
Adjustable direct supply, is connected with calibrating terminal respectively, is used to described voltage and current sensor, described analog-to-digital conversion module, described calibrating terminal and the power supply of described processor, and wherein said adjustable direct supply at least regulates more than twice;
Processor, is connected with described analog-to-digital conversion module, and the digital signal transmitting for the treatment of described analog-to-digital conversion module is also calculated, and output containing the isolating switch of voltage dependent resistor (VDR) point, the resistance of closing coil loop resistance.
2. electric resistance measuring apparatus according to claim 1, is characterized in that, also comprises;
Holding circuit, described holding circuit comprises direct supply holding circuit and the current-limiting protection circuit of prescribing a time limit, for cutting off the electricity supply in the time that adjustable direct supply electric voltage exception raises.
3. electric resistance measuring apparatus according to claim 1 and 2, is characterized in that,
Described adjustable direct supply comprises AC power, inner transtat and the rectification module of outside access, and described inner transtat and rectification module are for changing into inner available direct supply by the described AC power of outside access.
4. electric resistance measuring apparatus according to claim 3, is characterized in that,
The available direct supply in described inside comprises test direct supply and non-test direct supply, and described test is connected with described calibrating terminal with direct supply, and described non-test is connected with described analog-to-digital conversion module with described processor with direct supply.
5. electric resistance measuring apparatus according to claim 1, is characterized in that,
Described calibrating terminal comprises voltage tester terminal and testing current terminal.
6. electric resistance measuring apparatus according to claim 1 and 2, is characterized in that, also comprises:
Human-computer interaction interface, is connected with described processor, for the resistance value of video-stream processor output.
7. electric resistance measuring apparatus according to claim 1 and 2, is characterized in that, also comprises: printer, is connected with described processor, for printing the resistance value of described processor output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310574367.XA CN103837743A (en) | 2013-11-15 | 2013-11-15 | Resistance measuring device of circuit breaker with voltage dependent resistor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310574367.XA CN103837743A (en) | 2013-11-15 | 2013-11-15 | Resistance measuring device of circuit breaker with voltage dependent resistor |
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| CN103837743A true CN103837743A (en) | 2014-06-04 |
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| CN201310574367.XA Pending CN103837743A (en) | 2013-11-15 | 2013-11-15 | Resistance measuring device of circuit breaker with voltage dependent resistor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104076206A (en) * | 2014-06-20 | 2014-10-01 | 国家电网公司 | Method for measuring coil resistance with secondary voltammetry |
| CN108181510A (en) * | 2018-01-03 | 2018-06-19 | 宁波送变电建设有限公司 | A kind of switchgear divide-shut brake coil resistance indirect measurement method |
| CN114019245A (en) * | 2021-11-03 | 2022-02-08 | 华能国际电力股份有限公司德州电厂 | Resistance measuring method suitable for circuit breaker or disconnecting switch under high electric field intensity |
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Cited By (3)
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| CN104076206A (en) * | 2014-06-20 | 2014-10-01 | 国家电网公司 | Method for measuring coil resistance with secondary voltammetry |
| CN108181510A (en) * | 2018-01-03 | 2018-06-19 | 宁波送变电建设有限公司 | A kind of switchgear divide-shut brake coil resistance indirect measurement method |
| CN114019245A (en) * | 2021-11-03 | 2022-02-08 | 华能国际电力股份有限公司德州电厂 | Resistance measuring method suitable for circuit breaker or disconnecting switch under high electric field intensity |
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Application publication date: 20140604 |