CN111751622A - Method and system for measuring circuit breaker loop resistance - Google Patents
Method and system for measuring circuit breaker loop resistance Download PDFInfo
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- CN111751622A CN111751622A CN202010411714.7A CN202010411714A CN111751622A CN 111751622 A CN111751622 A CN 111751622A CN 202010411714 A CN202010411714 A CN 202010411714A CN 111751622 A CN111751622 A CN 111751622A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
- G01R31/3274—Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance
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Abstract
The invention discloses a method and a system for measuring circuit breaker loop resistance, wherein the method for measuring the circuit breaker loop resistance comprises the following steps: pre-detecting a voltage loop of a circuit breaker to be detected; controlling a power supply module to apply direct current test current to two ends of the circuit breaker to be tested; sampling, amplifying and carrying out analog-to-digital conversion processing on the voltage at two ends of the resistance-type current divider at one side of the circuit breaker to be tested based on a current signal sampling module to obtain a first voltage signal; sampling, amplifying and carrying out analog-to-digital conversion processing on the voltages at two ends of the circuit breaker to be tested based on a voltage signal sampling module to obtain a second voltage signal; and calculating the first voltage signal and the second voltage signal based on a main control chip, acquiring the loop resistance value of the circuit breaker to be tested and outputting the loop resistance value to a display screen. The measuring method and the measuring system provided by the invention can improve the measuring precision of the circuit breaker loop resistance and improve the overall measuring efficiency.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a method and a system for measuring circuit breaker loop resistance.
Background
The high-voltage circuit breaker is important electrical equipment in a power system, and the loop resistance test is an important means for reflecting the quality and the running state of the circuit breaker, so that the real contact condition of the contact of the circuit breaker can be effectively judged. Because the field electromagnetic environment is complex, how to measure the loop state of the circuit breaker more quickly and accurately is a problem that technicians are constantly dedicated to research.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides the method and the system for measuring the circuit breaker loop resistance, which can improve the measurement accuracy of the circuit breaker loop resistance through a pre-detection function and have good practicability and economy in specific implementation.
Correspondingly, the invention provides a method for measuring the circuit resistance of the circuit breaker, which comprises the following steps:
pre-detecting a voltage loop of a circuit breaker to be detected;
controlling a power supply module to apply direct current test current to two ends of the circuit breaker to be tested;
sampling, amplifying and carrying out analog-to-digital conversion processing on the voltage at two ends of the resistance-type current divider at one side of the circuit breaker to be tested based on a current signal sampling module to obtain a first voltage signal;
sampling, amplifying and carrying out analog-to-digital conversion processing on the voltages at two ends of the circuit breaker to be tested based on a voltage signal sampling module to obtain a second voltage signal;
and calculating the first voltage signal and the second voltage signal based on a main control chip, acquiring the loop resistance value of the circuit breaker to be tested and outputting the loop resistance value to a display screen.
In an optional embodiment, the pre-detecting the voltage loop of the circuit breaker to be detected includes: and identifying and judging the bad contact phenomenon existing on the voltage loop of the circuit breaker to be detected based on a pre-detection module.
In an optional embodiment, the controlling the power supply module to apply the dc test current to the two ends of the to-be-tested circuit breaker includes:
and adjusting the output voltage value of the power module through a capacitor charger inside the power module, and controlling the power module to apply direct current test current to the two ends of the circuit breaker to be tested based on the adjusted output voltage value reaching a preset voltage value.
In an optional embodiment, the operating the first voltage signal and the second voltage signal based on the main control chip includes:
dividing the first voltage signal by the resistance value of the resistance-type current divider to obtain a current signal flowing through the resistance-type current divider;
and calculating the ratio of the second voltage signal to the current signal, wherein the ratio is the loop resistance value of the circuit breaker to be tested.
In addition, the embodiment of the invention also provides a measuring system of the circuit breaker loop resistance, which comprises a power supply module, a resistance-type current divider, a voltage signal sampling module, a current signal sampling module, a pre-detection module and a main control chip;
the pre-detection module is used for judging whether a pair of voltage test lines and a circuit breaker to be tested, which are equipped in the test system, are in a good wiring state;
the power supply module is used for providing direct current test current for two ends of the circuit breaker to be tested;
the current signal sampling module is used for sampling the voltage at two ends of the resistance-type current divider;
the voltage signal sampling module is used for sampling voltages at two ends of the circuit breaker to be tested;
the main control chip is used for calculating the output signal of the current signal sampling module and the output signal of the voltage signal sampling module to obtain the loop resistance value of the circuit breaker to be tested.
In an optional implementation mode, the pre-detection module comprises a first relay, a small current constant current source and a second relay, and the small current constant current source is connected to the voltage test line through the first relay and the second relay and is connected to the circuit breaker to be detected.
In an optional embodiment, the power module comprises a storage battery, a capacitor charger, an electronic switch pair and a super capacitor;
the storage battery is used for supplying power to the capacitor charger and carrying out charging and terminal voltage real-time detection on the super capacitor through the capacitor charger; the electronic switch pair is used for controlling the charging and discharging behaviors of the super capacitor; the super capacitor is used for providing direct current test current for two ends of the circuit breaker to be tested.
In an optional implementation manner, one end of the resistance-type shunt is connected with the power supply module, and the other end of the resistance-type shunt is connected with the circuit breaker to be tested;
the input end of the current signal sampling module is connected in parallel with the two ends of the resistance-type current divider, and the output end of the current signal sampling module is connected with the main control chip and is used for collecting first voltage signals at the two ends of the resistance-type current divider and outputting the first voltage signals to the main control chip;
the input of voltage signal sampling module connects in parallel the both ends of circuit breaker that awaits measuring, the output of voltage signal sampling module is connected main control chip is used for gathering the second voltage signal at the circuit breaker both ends that await measuring and exporting extremely main control chip.
In an optional implementation manner, the current signal sampling module and the voltage signal sampling module both include a common mode filter circuit, a signal amplifier circuit and an AD sampling circuit, and the common mode filter circuit is connected to the signal amplifier circuit, and the signal amplifier circuit is connected to the AD sampling circuit.
In an optional implementation manner, the measurement system further includes a display screen, and the display screen is connected to the main control chip through a signal line and is used for displaying the loop resistance value of the circuit breaker to be measured.
The invention provides a method and a system for measuring the circuit resistance of a circuit breaker, which can improve the measurement precision of the circuit resistance of the circuit breaker through a pre-detection function and avoid the influence of external factors on the measurement result; the improved power supply module provides test current, and the super capacitor is used as a core device, so that the field test and utilization are facilitated, and the cost is low; in addition, the display screen is used for displaying the test data in real time, so that the operating personnel can take corresponding measures in time, and the method has good practicability in specific implementation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a structural composition diagram of a circuit breaker loop resistance measurement system disclosed by an embodiment of the invention;
fig. 2 is a schematic structural diagram of a current signal sampling module according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a circuit breaker loop resistance measurement method disclosed in the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a structural composition diagram of a circuit breaker loop resistance measurement system in an embodiment of the present invention. The embodiment of the invention provides a measuring system of a circuit breaker loop resistor, which comprises a power supply module, a resistance type shunt, a voltage signal sampling module, a current signal sampling module, a pre-detection module and a main control chip.
Basically, the pre-detection module is used for judging whether a pair of voltage test lines equipped in the measurement system and the circuit breaker to be tested are in a good wiring state; the power supply module is used for providing direct current test current for two ends of the circuit breaker to be tested; the current signal sampling module is used for sampling the voltage at two ends of the resistance-type current divider; the voltage signal sampling module is used for sampling voltages at two ends of the circuit breaker to be tested; the main control chip is used for calculating the output signal of the current signal sampling module and the output signal of the voltage signal sampling module to obtain the loop resistance value of the circuit breaker to be tested.
Further, the pre-detection module comprises a first relay, a small current constant current source and a second relay, wherein the small current constant current source passes through the first relay and the second relay are connected on the voltage test line and connected with the circuit breaker to be detected, the first relay is connected with a voltage positive test line, and the second relay is connected with a voltage negative test line. In specific implementation, based on the closing state of the first relay and the second relay, the voltage signal sampling module is used for acquiring a voltage value on the voltage test line, and then the main control chip judges whether the contact failure exists or not. The measuring system considers that the contact problem of the voltage test wire and the circuit breaker to be tested is provided with the pre-detection module, the influence of external factors is overcome preferentially, and the phenomenon that a tester misjudges that the measuring system has problems due to insufficient experience is avoided, so that the power failure time is delayed, unnecessary troubles are brought to test work, and inconvenience is brought to a power consumer.
Further, the power module includes a storage battery, a capacitor charger, an electronic switch pair and a super capacitor, the electronic switch pair includes a first electronic switch and a second electronic switch, and the first electronic switch and the second electronic switch all adopt IGBT switch tubes, and are controlled by the main control chip as the capacitor charger, as shown in fig. 1, the storage battery is connected to the capacitor charger, the capacitor charger is connected to the super capacitor through the first electronic switch, and the super capacitor is connected to the resistance shunt through the second electronic switch. In a specific implementation process, the storage battery is used for supplying power to the capacitor charger and performing charging and terminal voltage real-time detection on the super capacitor through the capacitor charger; the electronic switch pair is used for controlling the charging and discharging behaviors of the super capacitor; the super capacitor is used for providing direct current test current for two ends of the circuit breaker to be tested. At present, a high-frequency switching power supply and a high-current transformer are matched to realize a high-current output effect in actual engineering, and the integrated tester has large volume and weight, so that inconvenience and high cost are brought to field testing.
One end of the resistance-type shunt is connected with the power module, the other end of the resistance-type shunt is connected with the circuit breaker to be tested, and the resistance-type shunt is used for assisting in testing a current loop of the circuit breaker to be tested. Specifically, the input end of the current signal sampling module is connected in parallel to two ends of the resistive shunt, and the output end of the current signal sampling module is connected to the main control chip, and is used for acquiring a first voltage signal at two ends of the resistive shunt and converting the first voltage signal into a corresponding current signal based on the main control chip; the input of voltage signal sampling module connects in parallel the both ends of circuit breaker that awaits measuring, the output of voltage signal sampling module is connected main control chip is used for gathering the second voltage signal at the circuit breaker both ends that await measuring and exporting extremely main control chip. According to the embodiment of the invention, the current signal sampling module and the voltage signal sampling module can be used for simultaneously sampling the signals of the current loop and the voltage loop of the circuit breaker to be tested, so that the testing time length can be effectively shortened.
Fig. 2 is a schematic structural diagram of a current signal sampling module in an embodiment of the present invention, where an internal structure of the voltage signal sampling module is the same as that of the current signal sampling module, and each of the voltage signal sampling module and the current signal sampling module includes a common mode filter circuit, a signal amplification circuit, and an AD sampling circuit, where the common mode filter circuit is connected to the signal amplification circuit, and the signal amplification circuit is connected to the AD sampling circuit. The common mode filter circuit is used for overcoming common mode interference signals caused by long test connecting lines and avoiding errors generated by measurement results, and the signal amplification circuit and the AD sampling circuit are common signal processing circuits.
In addition, measurement system still includes the display screen, the display screen pass through the signal line with main control chip is connected for show the return circuit resistance value of the circuit breaker that awaits measuring is convenient for testing personnel to judge directly perceivedly the operating quality of the circuit breaker that awaits measuring to and the countermeasure of making in time.
Based on the circuit breaker loop resistance measurement system provided in fig. 1, fig. 3 shows a schematic flow chart of a circuit breaker loop resistance measurement method in an embodiment of the present invention. The embodiment of the invention provides a method for measuring circuit breaker loop resistance, which comprises the following steps:
s101, performing pre-detection on a voltage loop of a circuit breaker to be detected;
specifically, the poor contact phenomenon existing on the voltage loop of the circuit breaker to be detected is identified and judged based on the pre-detection module. The specific implementation process comprises the following steps: when a pair of voltage test lines equipped in a measurement system are clamped and connected to a wiring terminal bar of the circuit breaker to be tested by using respective test line clamps, a main control chip drives a first relay and a second relay in the pre-detection module to be in a closed state, and a small current constant current source in the pre-detection module applies a constant current power supply to two ends of the circuit breaker to be tested; a voltage signal sampling module is used for acquiring a voltage signal on the voltage test line and outputting the voltage signal to the main control chip; comparing the voltage signal with a preset voltage value through the main control chip; if the voltage value is smaller than the preset voltage value, the main control chip drives the first relay and the second relay to be in a disconnected state, and the step S102 is continuously executed; if the voltage value is larger than the preset voltage value, a display screen connected with the main control chip reminds a tester to handle the phenomenon of abnormal contact.
It should be noted that this step is for the problem that often appears in the circuit breaker measurement process: under most circumstances, the wiring terminal of the circuit breaker can generate an oxide film or an oil film on the surface of the wiring terminal after long-term operation, so that the voltage test wire and the wiring position of the circuit breaker to be tested generate poor contact, if the wiring work is not preferentially checked, the measurement result of the loop resistance of the circuit breaker to be tested is seriously influenced, the checking difficulty of testers is additionally increased, and the test efficiency is reduced.
S102, controlling the power supply module to apply direct current test current to two ends of the circuit breaker to be tested;
in the embodiment of the invention, the power module realizes the high-current discharge characteristic by replacing a common switching power supply with an internal super capacitor, and the super capacitor is used as a novel energy storage device, has the advantages of small internal resistance, high-current discharge, quick charging and the like, and can generate continuous current of more than 100A in a short time so as to meet the test requirement of the measuring system of the loop resistance of the circuit breaker to be tested.
The specific implementation process comprises the following steps: acquiring a terminal voltage value of the super capacitor through a capacitor charger inside the power module, outputting the terminal voltage value to the main control chip, and judging whether the terminal voltage value reaches a preset voltage value or not by using the main control chip; if yes, controlling a first electronic switch in the power module to be in an off state and a second electronic switch in the power module to be in an on state through the main control chip, and continuing to execute the step S103; if not, the control instruction is adjusted through the main control chip to control the capacitor charger to charge the super capacitor.
It should be noted that, because there is a layer of very thin film resistor on the contact surface of the moving contact and the static contact of the circuit breaker to be tested, if the direct current test current is too small, and the film resistor cannot be broken down, the finally measured loop resistance of the circuit breaker to be tested is smaller than the actual value, so the preset voltage value needs to be strictly set according to the test requirement of the circuit breaker to be tested and the capacitance value of the super capacitor.
S103, sampling, amplifying and carrying out analog-to-digital conversion processing on the voltage at two ends of the resistance-type current divider at one side of the circuit breaker to be tested based on the current signal sampling module to obtain a first voltage signal;
in the embodiment of the invention, a common-mode filter circuit, a signal amplification circuit and an AD sampling circuit are integrated in the current signal sampling module, so that a large common-mode interference signal existing in the measurement process is removed, a real signal is amplified and converted into a digital signal which can be recognized by the main control chip, and the accuracy of the first voltage signal is ensured.
S104, sampling, amplifying and carrying out analog-to-digital conversion processing on the voltages at the two ends of the circuit breaker to be tested based on a voltage signal sampling module to obtain a second voltage signal;
and S105, calculating the first voltage signal and the second voltage signal based on a main control chip, acquiring a loop resistance value of the circuit breaker to be detected and outputting the loop resistance value to a display screen.
In a specific implementation process, after acquiring the first voltage signal and the second voltage signal, the main control chip preferentially performs division operation with the first voltage signal according to the stored resistance value of the resistive shunt, so as to acquire a current signal flowing through the resistive shunt; calculating the ratio of the second voltage signal to the current signal, wherein the ratio is the loop resistance value of the circuit breaker to be tested; and the main control chip outputs the loop resistance value of the circuit breaker to be tested to the display screen for a tester to check and analyze.
The invention provides a method and a system for measuring the circuit resistance of a circuit breaker, which can improve the measurement precision of the circuit resistance of the circuit breaker through a pre-detection function and avoid the influence of external factors on the measurement result; the improved power supply module provides test current, and the super capacitor is used as a core device, so that the field test and utilization are facilitated, and the cost is low; in addition, the display screen is used for displaying the test data in real time, so that the operating personnel can take corresponding measures in time, and the method has good practicability in specific implementation.
The method and the system for measuring the circuit breaker loop resistance provided by the embodiment of the invention are described in detail, a specific example is adopted in the text to explain the principle and the implementation of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A method of measuring circuit breaker loop resistance, the method comprising:
pre-detecting a voltage loop of a circuit breaker to be detected;
controlling a power supply module to apply direct current test current to two ends of the circuit breaker to be tested;
sampling, amplifying and carrying out analog-to-digital conversion processing on the voltage at two ends of the resistance-type current divider at one side of the circuit breaker to be tested based on a current signal sampling module to obtain a first voltage signal;
sampling, amplifying and carrying out analog-to-digital conversion processing on the voltages at two ends of the circuit breaker to be tested based on a voltage signal sampling module to obtain a second voltage signal;
and calculating the first voltage signal and the second voltage signal based on a main control chip, acquiring the loop resistance value of the circuit breaker to be tested and outputting the loop resistance value to a display screen.
2. The method for measuring the circuit breaker loop resistance as claimed in claim 1, wherein the pre-detecting the voltage loop of the circuit breaker to be tested comprises: and identifying and judging the bad contact phenomenon existing on the voltage loop of the circuit breaker to be detected based on a pre-detection module.
3. The method of claim 1, wherein the controlling the power module to apply a dc test current across the circuit breaker to be tested comprises:
and adjusting the output voltage value of the power module through a capacitor charger inside the power module, and controlling the power module to apply direct current test current to the two ends of the circuit breaker to be tested based on the adjusted output voltage value reaching a preset voltage value.
4. The method of claim 1, wherein the operating the first voltage signal and the second voltage signal based on a main control chip comprises:
dividing the first voltage signal by the resistance value of the resistance-type current divider to obtain a current signal flowing through the resistance-type current divider;
and calculating the ratio of the second voltage signal to the current signal, wherein the ratio is the loop resistance value of the circuit breaker to be tested.
5. The measuring system of the circuit breaker loop resistance is characterized in that the testing system comprises a power supply module, a resistance-type shunt, a voltage signal sampling module, a current signal sampling module, a pre-detection module and a main control chip;
the pre-detection module is used for judging whether a pair of voltage test wires arranged in the measurement system and the circuit breaker to be tested are in a good wiring state;
the power supply module is used for providing direct current test current for two ends of the circuit breaker to be tested;
the current signal sampling module is used for sampling the voltage at two ends of the resistance-type current divider;
the voltage signal sampling module is used for sampling voltages at two ends of the circuit breaker to be tested;
the main control chip is used for calculating the output signal of the current signal sampling module and the output signal of the voltage signal sampling module to obtain the loop resistance value of the circuit breaker to be tested.
6. The system for measuring the loop resistance of the circuit breaker as claimed in claim 5, wherein the pre-detection module comprises a first relay, a small current constant current source and a second relay, and the small current constant current source is connected to the voltage test line through the first relay and the second relay and is connected to the circuit breaker to be tested.
7. The system of claim 5, wherein the power module comprises a battery, a capacitor charger, a pair of electronic switches, and a supercapacitor;
the storage battery is used for supplying power to the capacitor charger and carrying out charging and terminal voltage real-time detection on the super capacitor through the capacitor charger; the electronic switch pair is used for controlling the charging and discharging behaviors of the super capacitor; the super capacitor is used for providing direct current test current for two ends of the circuit breaker to be tested.
8. The system for measuring the loop resistance of the circuit breaker according to claim 5, wherein one end of the resistive shunt is connected with the power module, and the other end of the resistive shunt is connected with the circuit breaker to be measured;
the input end of the current signal sampling module is connected in parallel with the two ends of the resistance-type current divider, and the output end of the current signal sampling module is connected with the main control chip and is used for collecting first voltage signals at the two ends of the resistance-type current divider and outputting the first voltage signals to the main control chip;
the input of voltage signal sampling module connects in parallel the both ends of circuit breaker that awaits measuring, the output of voltage signal sampling module is connected main control chip is used for gathering the second voltage signal at the circuit breaker both ends that await measuring and exporting extremely main control chip.
9. The system as claimed in claim 5, wherein the current signal sampling module and the voltage signal sampling module each comprise a common mode filter circuit, a signal amplifier circuit and an AD sampling circuit, and the common mode filter circuit is connected to the signal amplifier circuit, and the signal amplifier circuit is connected to the AD sampling circuit.
10. The circuit breaker loop resistance measuring system according to claim 5, further comprising a display screen connected to the main control chip through a signal line for displaying the loop resistance value of the circuit breaker to be tested.
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| CN112649726A (en) * | 2020-12-08 | 2021-04-13 | 上能电气股份有限公司 | Switch mechanical life testing circuit and method |
| CN113030582A (en) * | 2021-04-16 | 2021-06-25 | 美登思电气（上海）有限公司 | Online measuring system for contact resistance of circuit breaker contact |
| CN113295991A (en) * | 2021-04-08 | 2021-08-24 | 国网浙江省电力有限公司台州供电公司 | Fault analysis method and device based on high-voltage circuit breaker control loop impedance |
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Application publication date: 20201009 |