CN115060997A - Coil testing method, voltage transformer, system, computer device and medium - Google Patents
Coil testing method, voltage transformer, system, computer device and medium Download PDFInfo
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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Abstract
The invention provides a coil testing method, a voltage transformer, a system, computer equipment and a medium, wherein a distributed capacitance value fed back by a switching-on/off coil is obtained after a preset current signal is input to the switching-on/off coil by using the voltage transformer, and whether the switching-on/off coil fails or not is judged according to the distributed capacitance value, so that whether the switching-on/off coil fails or not can be identified without powering off the switching-on/off coil and an external high-voltage circuit breaker, the problems of power load loss and power grid risk caused by the fact that the conventional high-voltage circuit breaker switching-on/off coil needs to be powered off and then carries out fault detection during fault detection in the prior art are solved, and the probability of power load loss and power grid risk is reduced.
Description
Technical Field
The invention relates to the technical field of electromagnetic coils, in particular to a coil testing method, a voltage transformer, a system, computer equipment and a medium.
Background
The high-voltage circuit breaker is a key device in a power system, has a quite perfect arc extinguishing structure and enough current breaking capacity, can not only cut off or close no-load current and load current in a high-voltage circuit, but also cut off overload current and short-circuit current through the action of a relay protection device when the system breaks down. The opening and closing coil is used as a key component of the high-voltage circuit breaker, and the fault of the opening and closing coil causes the action failure (called 'refusal action' for short) of the circuit breaker, particularly when the opening failure (called 'refusal action' for short), the circuit breaker at the previous stage is tripped, called 'override trip', the power failure range of the accident is expanded, even the system disconnection is possibly caused, and the serious accident of large-area power failure is caused;
and traditional high voltage circuit breaker divide-shut brake coil accessible monitoring input constant voltage undercurrent break-make realizes the simple function of coil broken string real-time supervision to prevent because the emergence of the malignant accident that the large tracts of land has a power failure appears in the trouble of traditional high voltage circuit breaker divide-shut brake coil self, but traditional high voltage circuit breaker divide-shut brake coil structure does not possess discernment self trouble function. Meanwhile, when the traditional high-voltage circuit breaker opening and closing coil is required to be judged to be in fault, the high-voltage circuit breaker can be caused to act, the high-voltage circuit breaker needs to be subjected to fault detection after the high-voltage circuit breaker to be detected is powered off and isolated from a power grid in order to prevent the detection process from causing misoperation of the high-voltage circuit breaker, and therefore the extra power failure process can cause power load loss and power grid risks to a certain degree.
Therefore, how to research a test method which can identify the faults of the opening and closing coils of the traditional high-voltage circuit breaker and does not need to cut off the power of the high-voltage circuit breaker during monitoring becomes a problem which needs to be solved urgently.
Disclosure of Invention
In view of the above, it is necessary to provide a coil testing method, a voltage transformer, a system, a computer device, and a medium, which can identify faults such as turn-to-turn short circuit and short circuit virtual connection of a coil and can monitor without disconnecting the power of a line.
A coil testing method comprises an opening and closing coil and a voltage transformer, wherein the opening and closing coil is connected with a power supply line, a testing end of the voltage transformer is connected to two ends of the opening and closing coil, a power supply end of the voltage transformer is connected with external power supply, and the method comprises the following steps:
inputting a preset current signal into two ends of the opening and closing coil through the voltage transformer;
acquiring pilot frequency voltage acquired by the secondary side of the voltage transformer after the preset current signal is input;
calculating the distributed capacitance value of the opening and closing coil according to the pilot frequency voltage and the preset current signal;
and judging whether the opening and closing coil fails or not according to the distributed capacitance value.
Further, the frequency range of the preset current signal is 2kHz-1000 kHz.
Further, the current value range of the preset current signal is 0.1 mA-100 mA.
Further, the step of calculating the distributed capacitance value of the switching-on/off coil according to the pilot frequency voltage and the preset current signal specifically includes:
acquiring the current value and the current angular frequency of the preset current signal, and recording as an estimated current value and an estimated angular frequency;
acquiring a voltage value of the pilot frequency voltage, and recording the voltage value as a calculated voltage value;
acquiring theoretical coil resistance and theoretical coil inductance of the opening and closing coil, and recording as coil resistance parameters and coil inductance parameters;
acquiring the coil transformation ratio of the voltage transformer, and recording the coil transformation ratio as a coil ratio parameter;
recording the estimated current value, the estimated angular frequency, the estimated voltage value, the coil resistance parameter, and the coil inductance parameter as the estimated current value i 0 The estimated angular frequency ω and the estimated voltage value u o The coil resistance parameter R, the coil inductance parameter L and the coil ratio parameter n 2 /n 1 ；
Will i is described 0 ω, i 0 The u o R, L and n 2 /n 1 And calculating by using a preset linear equation so as to obtain the distributed capacitance value.
Further, the preset linear equation is embodied as:
wherein the value of C in the predetermined linear equation is the distributed capacitance value.
Further, whether the opening and closing coil fails or not is judged according to the distributed capacitance value, and the method specifically comprises the following steps:
acquiring a preset capacitance amplitude value matched with the opening and closing coil;
judging whether the distributed capacitance value is in the preset capacitance amplitude value or not;
if not, judging that the opening and closing coil has a fault, otherwise, judging that the opening and closing coil has no fault.
A voltage transformer comprises a power supply module, a high-frequency power supply module, a current output module, a measuring module, a processing module and an electromagnetic voltage transformer;
the detection end of the electromagnetic voltage transformer is connected with two ends of the switching-on and switching-off coil, so that the functions of inputting preset current signals and obtaining pilot frequency voltage are achieved, the electromagnetic voltage transformer is further connected with one end of the measuring module, so that specific parameters of the pilot frequency voltage are obtained through the measuring module, the other end of the measuring module is connected with one end of the current output unit, so that the preset current signals are output through the current output unit, the other end of the current output unit is connected with one end of the high-frequency power supply module, so that the preset current signals are generated through the high-frequency power supply module, the other end of the high-frequency power supply module is connected with one end of the power supply module, so that external power supply is connected, the other end of the power supply module is connected with the external power supply, and the processing module is connected with the power supply module, The high-frequency power supply module, the current output module, the measuring module and the electromagnetic voltage transformer are connected, so that the function of calculating the distributed capacitance value is realized;
the processing module comprises a processing unit and a display unit;
the processing unit is connected with the display unit and used for calculating the distribution capacitance value and displaying the distribution capacitance value through the display unit.
The utility model provides a coil test system, includes divide-shut brake coil and voltage transformer, divide-shut brake coil links to each other with the power supply line, voltage transformer's test end is connected divide-shut brake coil both ends, voltage transformer's supply end links to each other with the outside power supply, the system includes:
the input unit is used for inputting a preset current signal into two ends of the opening and closing coil through the voltage transformer;
the acquisition unit is used for acquiring the pilot frequency voltage acquired by the secondary side of the voltage transformer after the preset current signal is input;
the calculation unit is used for calculating the distributed capacitance value of the opening and closing coil according to the pilot frequency voltage and the preset current signal;
and the judging unit is used for judging whether the opening and closing coils are in fault or not according to the distributed capacitance values.
A computer device comprising a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the steps of:
inputting a preset current signal into two ends of the opening and closing coil through the voltage transformer;
acquiring pilot frequency voltage acquired by the secondary side of the voltage transformer after the preset current signal is input;
calculating the distributed capacitance value of the opening and closing coil according to the pilot frequency voltage and the preset current signal;
and judging whether the opening and closing coil fails or not according to the distributed capacitance value.
A computer-readable medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of:
inputting a preset current signal into two ends of the opening and closing coil through the voltage transformer;
acquiring pilot frequency voltage acquired by the secondary side of the voltage transformer after the preset current signal is input;
calculating the distributed capacitance value of the opening and closing coil according to the pilot frequency voltage and the preset current signal;
and judging whether the opening and closing coil fails or not according to the distributed capacitance value.
According to the coil testing method, the voltage transformer, the system, the computer equipment and the medium, the distributed capacitance value fed back by the opening and closing coil is obtained after the preset current signal is input to the opening and closing coil by using the voltage transformer, and whether the opening and closing coil breaks down is judged according to the distributed capacitance value, so that whether the opening and closing coil breaks down can be identified without powering off the opening and closing coil and an external high-voltage circuit breaker, the problems of power load loss and power grid risk caused by the fact that the high-voltage circuit breaker needs to be powered off and then fault detection is carried out when fault detection is carried out on the existing traditional opening and closing coil of the high-voltage circuit breaker in the prior art are solved, and the probability of power load loss and power grid risk occurrence is reduced.
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.
Wherein:
FIG. 1 is a flow chart illustrating a coil testing method according to an embodiment;
FIG. 2 is a block diagram of a coil testing system according to an embodiment;
FIG. 3 is a schematic diagram illustrating an installation of a switching-on/off coil and a voltage transformer in an embodiment;
FIG. 4 is a schematic diagram of an embodiment of a voltage transformer;
FIG. 5 is a block diagram of a processing module in one embodiment;
FIG. 6 is a block diagram of a computing device in one embodiment.
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.
Referring to fig. 1 and 3, a coil testing method includes a switching-on/off coil 1 and a voltage transformer 2, the switching-on/off coil 1 is connected to a power supply line, a testing end of the voltage transformer 2 is connected to two ends of the switching-on/off coil 1, and a power supply end of the voltage transformer 2 is connected to an external power supply, and the method includes:
s1, inputting a preset current signal to two ends of the opening and closing coil through the voltage transformer;
as described in the step S1, the power supply end of the voltage transformer is connected to an external 220V power supply, and the test end of the voltage transformer is connected to both ends of the opening/closing coil, so as to monitor the specific parameters of the opening/closing coil, and then the background system controls the voltage transformer to convert the external 220V power supply into a preset current signal and inject the preset current signal into both ends of the opening/closing coil through the test end of the voltage transformer, so as to determine the state of the opening/closing coil by obtaining the feedback of the opening/closing coil after injecting the preset current signal;
in addition, the background system is generally a background server, and in addition, the background system may be an independent server, or may be a cloud server that provides basic cloud computing services such as cloud service, a cloud database, cloud computing, a cloud function, cloud storage, web service, cloud communication, middleware service, domain name service, security service, Content Delivery Network (CDN), and a big data and artificial intelligence platform, which is not limited in this respect.
S2, obtaining pilot frequency voltage obtained by the secondary side of the voltage transformer after the preset current signal is input;
as described in step S2, after the background system injects the preset current signal into the opening/closing coil through the testing end of the voltage transformer, the current value and the voltage value of the opening/closing coil fluctuate, and at this time, the background system acquires the pilot frequency voltage acquired at the secondary side of the voltage transformer (i.e., the fluctuating voltage of the opening/closing coil after the preset current signal is injected into the opening/closing coil).
S3, calculating the distributed capacitance value of the opening and closing coil according to the pilot frequency voltage and the preset current signal;
as described in step S3, the background system calculates the distributed capacitance value of the opening/closing coil according to the specific value of the pilot frequency voltage and the specific value of the preset current signal, which are obtained by the voltage transformer.
And S4, judging whether the opening and closing coil has a fault according to the distributed capacitance value.
As described in step S4, the background system determines whether the opening/closing coil is faulty according to the specific value of the distributed capacitance value;
specifically, the background system acquires a preset distributed capacitance preset value, then the background system judges whether the distributed capacitance value is higher than the distributed capacitance preset value, if so, the opening and closing coil is judged to be in a fault, and if not, the opening and closing coil is judged to be in a normal state.
Through the structure, the distributed capacitance value that divides closing coil feedback is obtained after presetting the current signal to the divide-shut brake coil input through using voltage transformer to this embodiment, and according to the distributed capacitance value is judged divide-shut brake coil whether the mode that breaks down has realized need not to cut off the power supply to divide-shut brake coil and outside high voltage circuit breaker and can discern that divide-shut brake coil whether breaks down, has solved current traditional high voltage circuit breaker divide-shut brake coil among the prior art and need carry out fault detection again after cutting off the power supply with high voltage circuit breaker when carrying out fault detection, leads to the problem of power load loss and electric wire netting risk, has reduced the probability that power load loss and electric wire netting risk take place.
In an embodiment, the frequency range of the predetermined current signal is 2kHz to 1000 kHz.
As described in the above embodiment, the frequency range of the preset current signal is 2kHz to 1000 kHz;
for example, the following steps are carried out: and the background system injects a preset current signal with the frequency range of 20kHz into two ends of the switching-on and switching-off coil through the voltage transformer, so that the function of testing the switching-on and switching-off coil is realized.
In one embodiment, the current value range of the preset current signal is 0.1mA to 100 mA.
As described in the above embodiment, the current value range of the preset current signal is 0.1mA to 100 mA;
for example, the following steps are carried out: and the background system injects a preset current signal with a current value range of 50mA into two ends of the switching-on/off coil through the voltage transformer, so that the function of testing the switching-on/off coil is realized.
In an embodiment, the step S3 specifically includes:
s31, obtaining a current value and a current angular frequency of the preset current signal, recording the current value and the current angular frequency as an estimated current value and an estimated angular frequency, obtaining a voltage value of the pilot frequency voltage as an estimated voltage value, obtaining a theoretical coil resistance and a theoretical coil inductance of the opening and closing coil, recording coil resistance parameters and coil inductance parameters as a coil transformation ratio of the voltage transformer as a coil ratio parameter, and recording the estimated current value, the estimated angular frequency, the estimated voltage value, the coil resistance parameters and the coil inductance parameters as the estimated current value i 0 The estimated angular frequency ω and the estimated voltage value u o The coil resistance parameter R, the coil inductance parameter L and the coil ratio parameter n 2 /n 1 A 1 to i 0 ω, i 0 The u o R, L and n 2 /n 1 And calculating by using a preset linear equation so as to obtain the distributed capacitance value.
As described in the above embodiment, the background system obtains the current value and the current angular frequency of the preset current signal through the voltage transformer, obtains the voltage value of the pilot frequency voltage after being recorded as the estimated current value and the estimated angular frequency, obtains the theoretical coil resistance and the theoretical coil inductance of the switching-on/off coil input by the user, and records the theoretical coil resistance and the theoretical coil inductance as coil resistance parameters and coil inductance parameters, finally obtains the coil transformation ratio matched with the voltage transformer input by the user, and records the coil transformation ratio as coil ratio parameters, and finally obtains the current value and the estimated angular frequency, the calculated voltage value, the coil resistance parameter, the coil inductance parameter and the coil ratio parameter are calculated, so that the distributed capacitance value of the opening and closing coil is calculated;
the background system sets preset parameter labels for the calculated current value, the calculated angular frequency, the calculated voltage value, the coil resistance parameter and the coil inductance parameter, and specifically shows that: the estimated current value i 0 The estimated angular frequency ω and the estimated voltage value u o The coil resistance parameter R, the coil inductance parameter L and the coil ratio parameter n 2 /n 1 Then the background system acquires the preset linear equation and compares the i 0 ω, i 0 The u o R, L and n 2 /n 1 And inputting the calculated values into the preset linear equation to calculate the distributed capacitance value.
In one embodiment, the preset linear equation is embodied as:
wherein the value of C in the predetermined linear equation is the distributed capacitance value.
As described in the above embodiment, the preset linear equation is embodied as:
the background system will send the i 0 ω, i 0 The u o R, L and n 2 /n 1 Input to the preset lineCalculating in the linear equation to obtain the value of C in the preset linear equation, namely the distributed capacitance value.
In an embodiment, the step S4 specifically includes:
s41, acquiring a preset capacitance amplitude value matched with the opening and closing coil, judging whether the distributed capacitance value is in the preset capacitance amplitude value, if not, judging that the opening and closing coil has a fault, otherwise, judging that the opening and closing coil has no fault.
As in the above embodiment, the background system obtains a preset capacitance amplitude value matched with the switching-closing coil for input, and then the background system determines whether the distributed capacitance value is in the preset capacitance amplitude value, if so, the background system determines whether the distributed capacitance value fed back by the switching-closing coil is in the preset capacitance amplitude value after the voltage transformer injects the preset current signal into the switching-closing coil, and if not, determines that the switching-closing coil feedback is abnormal, at this time, the background system determines that the switching-closing coil fails, otherwise, when the distributed capacitance value is in the preset capacitance amplitude value, the background system determines that the switching-closing coil fails.
Referring to fig. 4, a voltage transformer includes a power supply module 22, a high frequency power supply module 23, a current output module 24, a measurement module 25, a processing module 26, and an electromagnetic voltage transformer 27;
the detection end of the electromagnetic voltage transformer 27 is connected with the two ends of the opening and closing coil 1, so as to realize the functions of inputting a preset current signal and acquiring a pilot frequency voltage, the electromagnetic voltage transformer 27 is further connected with one end of the measuring module 25, so as to acquire specific parameters of the pilot frequency voltage through the measuring module 25, the other end of the measuring module 25 is connected with one end of the current output unit 24, so as to output the preset current signal through the current output unit 24, the other end of the current output unit 24 is connected with one end of the high-frequency power module 23, so as to generate the preset current signal through the high-frequency power module 23, the other end of the high-frequency power module 23 is connected with one end of the power module 22, so as to be connected with an external power supply, the other end of the power module 22 is connected with the external power supply, the processing module 26 is connected with the power module 22, the high-frequency power module 23, the power module 24, and the measuring module 24, The current output module 24, the measuring module 25 and the electromagnetic voltage transformer 27 are connected, so that the function of calculating the distributed capacitance value is realized;
referring to fig. 5, wherein the processing module 26 includes a processing unit 261 and a display unit 262;
the processing unit 261 is connected to the display unit 262, and the processing unit 261 is configured to estimate the distribution capacitance and display the distribution capacitance through the display unit 262.
As described in the above embodiment, the detection end of the electromagnetic voltage transformer 27 is connected to the two ends of the switching-on/off coil 1, so as to inject the preset current signal into the switching-on/off coil 1 according to the control signal of the background system, thereby implementing the functions of inputting the preset current signal and obtaining the pilot frequency voltage, the electromagnetic voltage transformer 27 is further connected to one end of the measurement module 25, so that the background system obtains the specific parameter of the pilot frequency voltage through the measurement module 25, the other end of the measurement module 25 is connected to one end of the current output unit 24, so that the voltage transformer can output the preset current signal required by the background system through the current output unit 24, the other end of the current output unit 24 is connected to one end of the high-frequency power module 23, so as to generate the preset current signal through the high-frequency power module 23, and achieve the effect of outputting the preset current signal through the voltage transformer, the other end of the high-frequency power module 23 is connected with one end of the power module 22 so as to be connected with external power supply, the other end of the power module 22 is connected with the external power supply, and the processing module 26 is connected with the power module 22, the high-frequency power module 23, the current output module 24, the measuring module 25 and the electromagnetic voltage transformer 27 so as to realize the function of calculating the distribution capacitance value according to the pilot frequency voltage acquired from each module;
in addition, the processing unit 261 is connected to the display unit 262, the processing unit 261 is configured to calculate the distribution capacitance value, and the display unit 262 is configured to display the distribution capacitance value, so that the user can view the distribution capacitance value in real time.
Referring to fig. 2, a coil test system, including divide-shut brake coil 1 and voltage transformer 2, divide-shut brake coil 1 links to each other with the power supply line, and voltage transformer 2's test end is connected at 1 both ends of divide-shut brake coil, and voltage transformer 2's supply end links to each other with external power supply, the system includes:
the input unit 10 is used for inputting a preset current signal into two ends of the opening and closing coil through the voltage transformer;
an obtaining unit 20, configured to obtain a pilot frequency voltage obtained at a secondary side of the voltage transformer after the preset current signal is input;
the calculating unit 30 is configured to calculate a distributed capacitance value of the switching-on/off coil according to the pilot frequency voltage and the preset current signal;
and the judging unit 40 is used for judging whether the opening and closing coils are in failure or not according to the distributed capacitance value.
The units are not described one by one, and are used for executing the coil testing system.
FIG. 6 is a diagram that illustrates an internal structure of the computer device in one embodiment. The computer device may specifically be a server including, but not limited to, a high performance computer and a cluster of high performance computers. As shown in fig. 6, the computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system and also stores a computer program, and when the computer program is executed by a processor, the computer program can enable the processor to realize the employee state judgment method. The internal memory may also have stored therein a computer program that, when executed by the processor, causes the processor to perform the coil testing method.
In one embodiment, the client behavior recognition method provided by the present invention can be implemented in the form of a computer program that can be run on a computer device as shown in fig. 6. The memory of the computer device can store various program templates which form the automatic mail classification and aggregation device. Such as: the input unit 10, the acquisition unit 20, the estimation unit 30, and the determination unit 40.
A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
inputting a preset current signal into two ends of the opening and closing coil through the voltage transformer, acquiring pilot frequency voltage acquired by the secondary side of the voltage transformer after the preset current signal is input, calculating a distributed capacitance value of the opening and closing coil according to the pilot frequency voltage and the preset current signal, and judging whether the opening and closing coil fails according to the distributed capacitance value.
According to the embodiment, the method has the greatest beneficial effects that the distributed capacitance value fed back by the switching-on and switching-off coil is obtained after the preset current signal is input to the switching-off and switching-off coil by using the voltage transformer, and whether the switching-on and switching-off coil breaks down or not is judged according to the distributed capacitance value, so that whether the switching-on and switching-off coil breaks down or not can be identified without powering off the switching-on and switching-off coil and an external high-voltage circuit breaker, the problems of power load loss and power grid risks caused by the fact that the conventional high-voltage circuit breaker switching-on and switching-off coil needs to be powered off and then fault detection is carried out during fault detection in the prior art are solved, and the probability of power load loss and power grid risks is reduced.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a non-volatile computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the program is executed. Any reference to memory, storage, databases, or other media used in embodiments provided herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), and double data rate.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A coil testing method is characterized by comprising an opening and closing coil and a voltage transformer, wherein the opening and closing coil is connected with a power supply line, a testing end of the voltage transformer is connected to two ends of the opening and closing coil, a power supply end of the voltage transformer is connected with external power supply, and the method comprises the following steps:
inputting a preset current signal into two ends of the opening and closing coil through the voltage transformer;
acquiring pilot frequency voltage acquired by the secondary side of the voltage transformer after the preset current signal is input;
calculating the distributed capacitance value of the opening and closing coil according to the pilot frequency voltage and the preset current signal;
and judging whether the opening and closing coil fails or not according to the distributed capacitance value.
2. The coil testing method of claim 1, wherein the predetermined current signal has a frequency in a range of 2kHz to 1000 kHz.
3. The coil testing method of claim 1, wherein the preset current signal has a current value ranging from 0.1mA to 100 mA.
4. The coil testing method according to claim 1, wherein the step of calculating the distributed capacitance value of the opening/closing coil according to the pilot frequency voltage and the preset current signal specifically includes:
acquiring the current value and the current angular frequency of the preset current signal, and recording as an estimated current value and an estimated angular frequency;
acquiring a voltage value of the pilot frequency voltage, and recording the voltage value as a calculated voltage value;
acquiring theoretical coil resistance and theoretical coil inductance of the opening and closing coil, and recording as coil resistance parameters and coil inductance parameters;
acquiring the coil transformation ratio of the voltage transformer, and recording the coil transformation ratio as a coil ratio parameter;
recording the estimated current value, the estimated angular frequency, the estimated voltage value, the coil resistance parameter, and the coil inductance parameter as the estimated current value i 0 The estimated angular frequency ω and the estimated voltage value u o The coil resistance parameter R, the coil inductance parameter L and the coil ratio parameter n 2 /n 1 ；
Will i is 0 ω, i 0 The u o R, L and n 2 /n 1 And calculating by using a preset linear equation so as to obtain the distributed capacitance value.
5. The coil testing method of claim 4, wherein the predetermined linear equation is embodied as:
wherein the value of C in the predetermined linear equation is the distributed capacitance value.
6. The coil testing method according to claim 1, wherein the determining whether the opening/closing coil fails according to the distributed capacitance value specifically includes:
acquiring a preset capacitance amplitude matched with the opening and closing coil;
judging whether the distributed capacitance value is in the preset capacitance amplitude value or not;
if not, judging that the opening and closing coil has a fault, otherwise, judging that the opening and closing coil has no fault.
7. A voltage transformer is characterized by comprising a power supply module, a high-frequency power supply module, a current output module, a measuring module, a processing module and an electromagnetic voltage transformer;
the detection end of the electromagnetic voltage transformer is connected with two ends of the opening and closing coil, so that the functions of inputting preset current signals and acquiring pilot frequency voltage are achieved, the electromagnetic voltage transformer is further connected with one end of the measuring module, so that specific parameters of the pilot frequency voltage are acquired through the measuring module, the other end of the measuring module is connected with one end of the current output unit, so that the preset current signals are output through the current output unit, the other end of the current output unit is connected with one end of the high-frequency power supply module, so that the preset current signals are generated through the high-frequency power supply module, the other end of the high-frequency power supply module is connected with one end of the power supply module, so that external power supply is connected, the other end of the power supply module is connected with the external power supply, and the processing module is connected with the power supply module, The high-frequency power supply module, the current output module, the measuring module and the electromagnetic voltage transformer are connected, so that the function of calculating the distributed capacitance value is realized;
the processing module comprises a processing unit and a display unit;
the processing unit is connected with the display unit and used for calculating the distribution capacitance value and displaying the distribution capacitance value through the display unit.
8. The utility model provides a coil test system which characterized in that, includes divide-shut brake coil and voltage transformer, divide-shut brake coil links to each other with the power supply line, voltage transformer's test end is connected divide-shut brake coil both ends, voltage transformer's supply end links to each other with external power supply, the system includes:
the input unit is used for inputting a preset current signal into two ends of the opening and closing coil through the voltage transformer;
the acquisition unit is used for acquiring the pilot frequency voltage acquired by the secondary side of the voltage transformer after the preset current signal is input;
the calculation unit is used for calculating the distributed capacitance value of the opening and closing coil according to the pilot frequency voltage and the preset current signal;
and the judging unit is used for judging whether the opening and closing coils are in fault or not according to the distributed capacitance values.
9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the coil testing method as claimed in any one of claims 1 to 6 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the coil testing method according to any one of claims 1 to 6.
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