CN107607764B - Multi-path capacitive voltage transformer real-time detection device - Google Patents

Multi-path capacitive voltage transformer real-time detection device Download PDF

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Publication number
CN107607764B
CN107607764B CN201710350512.4A CN201710350512A CN107607764B CN 107607764 B CN107607764 B CN 107607764B CN 201710350512 A CN201710350512 A CN 201710350512A CN 107607764 B CN107607764 B CN 107607764B
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signal
transmission
voltage
voltage transformer
mutation
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CN107607764A (en
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唐琪
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Foshan Power Supply Bureau of Guangdong Power Grid Corp
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Foshan Power Supply Bureau of Guangdong Power Grid Corp
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Abstract

The invention discloses a real-time detection device for multiple paths of capacitive voltage transformer equipment. The device comprises a capacitor voltage transformer, an alternating current conversion circuit, an STM32 chip, a data memory, a power supply, transmission equipment and a background terminal. The invention solves the problems that the existing capacitor voltage transformer monitoring equipment cannot detect the state of the equipment in a multi-path way in real time and cannot find the high-voltage defect of the capacitor voltage transformer. The working state and the high-voltage defect of the multi-path capacitor voltage transformer equipment can be known in real time by workers, and the safety of a power supply system is guaranteed.

Description

Multi-path capacitive voltage transformer real-time detection device
Technical Field
The invention relates to the field of electrical equipment detection, in particular to a method and a device for detecting a capacitor voltage transformer.
Background
The capacitive voltage transformer is widely applied to an electric power system, and mainly used for detecting the voltage condition of an electric power bus and a line. The damping device has the advantages of small impact strength, small volume and light weight, can reliably damp ferromagnetic resonance in practical application, has excellent transient response characteristic, gradually replaces an electromagnetic voltage transformer, and is an essential device in a power grid.
The capacitor voltage transformer acquires the voltage of a bus or a line in a capacitance voltage division mode, and then the voltage of the bus or the line is reduced to the secondary side of 100V/57.7V at the maximum through the electromagnetic transformer. Then the system such as dispatching and relay protection is used for obtaining the voltage, and the actual voltage of the bus or the line is reversely deduced.
In actual operation, the voltage acquired by the system such as scheduling and relay protection from the capacitor voltage transformer can only be used for detecting the operation condition of a bus or a line, and the condition of the capacitor voltage transformer equipment is not concerned. If the capacitor voltage transformer has a fault, the voltage detection is abnormal if the fault occurs, so that misjudgment of a dispatching and relay protection system is caused, explosion can occur if the fault occurs seriously, and serious consequences are caused.
At present, a method for ensuring the healthy operation of a capacitor voltage transformer is to perform a preventive test on the capacitor voltage transformer through periodic power failure, and judge whether the capacitor voltage transformer is good or not according to a test result. However, this method has the following drawbacks:
1. periodic power failure tests can cause waste of electric energy and human resources.
2. A plurality of capacitor voltage transformers can not be detected simultaneously during a power failure test, and only one of the capacitor voltage transformers can be detected.
3. During a power failure test, the voltage applied to the capacitor voltage transformer is generally lower and is below about 10KV, and the voltage applied to the capacitor voltage transformer during operation is generally tens or hundreds of KV. Therefore, the power failure test cannot guarantee that the defects of the capacitor voltage transformer under high voltage can be found.
Disclosure of Invention
The invention overcomes the technical defects of the existing capacitive voltage transformer detection, provides a novel multi-path real-time detection method and a novel multi-path real-time detection device, can effectively solve the problem of periodic power failure test of the capacitive voltage transformer, and can simultaneously detect a plurality of capacitive voltage transformers without influencing the operation of a power grid. Meanwhile, the defects of the capacitor voltage transformer under the high voltage condition can be found, and the equipment safety of the capacitor voltage transformer is guaranteed.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a real-time detection device for a multi-path capacitive voltage transformer comprises a plurality of paths of voltage acquisition and transmission modules and a background terminal, wherein each path of voltage acquisition and transmission module is connected with the background terminal in a wireless communication mode; each voltage acquisition and transmission module comprises a capacitor voltage transformer, an alternating current conversion circuit, a microprocessor, a power supply, a data memory and transmission equipment which are connected with each other; the alternating current conversion circuit is connected with the capacitor voltage transformer; the alternating current conversion circuit is also connected with the microprocessor; the microprocessor is also connected with the transmission equipment; the microprocessor is also connected with the data memory; the power supply is connected with the microprocessor; the power supply is also connected to the transmission device.
In a preferred scheme, the microprocessor is a main frequency 72MHz enhanced STM32 chip, and the sampling frequency is set to be 100 KHz. The microprocessor is responsible for carrying out signal processing on the detection voltage of the capacitor voltage transformer subjected to voltage reduction processing, wherein the signal processing comprises analog-to-digital conversion, high-speed sampling, data comparison and parallel/serial transmission conversion.
In a preferred scheme, the transmission device is a WiFi transmission device. And the WiFi transmission equipment transmits the signals obtained by each voltage acquisition and transmission module to the background terminal.
In a preferred embodiment, the ac power conversion circuit is a voltage divider circuit composed of a small transformer or a resistor. The alternating current conversion circuit reduces the detection voltage of the capacitor voltage transformer, and the parameter requirement of an STM32 chip is met.
In a preferred scheme, the background terminal is an integrated comprehensive processing device, and the integrated comprehensive processing device has the functions of receiving signals, processing signals and providing a human-computer interaction interface.
In a preferred embodiment, the data storage is NOR Flash.
A real-time detection method for a multi-path capacitive voltage transformer equipment detection device comprises the following steps:
step A: in each voltage acquisition and transmission module, an alternating current conversion circuit reduces the voltage of the real-time voltage acquired by the capacitor voltage transformer to obtain an analog signal;
and B: d, the microprocessor carries out AD conversion on the analog signal obtained in the step A to obtain a digital signal;
and C: b, judging whether the digital signal obtained in the step B has mutation, and if the digital signal has mutation, storing the digital signal with mutation into an abnormal data memory;
step D: b, processing the digital signal obtained in the step B;
step E: the mutation signal in the step C and the signal obtained in the step D are serially transmitted to the transmission equipment through the parallel/serial transmission conversion module, and then are transmitted to the background terminal by the transmission equipment;
step F: the background terminal carries out secondary comparison processing on the signals transmitted by each voltage acquisition and transmission module;
step G: and feeding back the comparison result to a worker.
In a preferred embodiment, the step D specifically includes the following steps:
when the signal obtained in the step B is normal, carrying out periodic averaging on the signal, wherein each period is one minute, and then outputting average data; when the signal obtained in the step B has mutation, recording the mutation signal, replacing the average data of one minute with the mutation signal, and then outputting the mutation signal.
In a preferred embodiment, the step F is specifically as follows:
step 1: the background terminal divides the same number of logic units according to the number of signals transmitted by the voltage acquisition and transmission module;
step 2: the background terminal finds out a sudden change signal in the signals transmitted by the voltage acquisition and transmission module, and marks a problem that the capacitive voltage transformer has in a corresponding logic unit;
and step 3: the background terminal adds the data without the mutation signals to calculate an average value, stores the average value into each logic unit except the logic unit marked in the step 2, simultaneously stores the data obtained by the corresponding voltage acquisition and transmission module into the respective logic unit, compares the respective data with the average value, and obtains an offset value;
and 4, step 4: and comparing the deviation value with a set corresponding deviation threshold value of the voltage grade, and if the deviation value exceeds the threshold value, reporting the abnormal information of the capacitor voltage transformer.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that: the invention provides a detection method and a detection device for a multipath capacitor voltage transformer. And then the signals are transmitted to a background terminal through WiFi transmission, and the background terminal compares the signals transmitted by the voltage acquisition and transmission modules of each path, gives information whether each capacitive voltage transformer device is in a normal state or not, and feeds the information back to a worker. The device comprises a capacitor voltage transformer, an alternating current conversion circuit, an STM32 chip, a data memory, a power supply, transmission equipment and a background terminal. The invention overcomes the technical defects of the existing capacitive voltage transformer detection, provides a new detection method and a matching device, can effectively solve the problem of the periodic power failure test of the capacitive voltage transformer, and can detect multiple capacitive voltage transformers at any time without influencing the operation of a power grid. Meanwhile, the defects of the capacitor voltage transformer under the high voltage condition can be found, and the equipment safety of the capacitor voltage transformer is guaranteed.
Drawings
FIG. 1 is a schematic view of a detection apparatus.
FIG. 2 is a schematic flow chart of the detection method.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, the detection device comprises a plurality of voltage acquisition and transmission modules and a background terminal, wherein each voltage acquisition and transmission module is connected with the background terminal in a wireless communication manner; each voltage acquisition and transmission module comprises a capacitor voltage transformer, an alternating current conversion circuit, a microprocessor, a power supply, a data memory and transmission equipment which are connected with each other; the alternating current conversion circuit is connected with the capacitor voltage transformer; the alternating current conversion circuit is also connected with the microprocessor; the microprocessor is also connected with the transmission equipment; the microprocessor is also connected with the data memory; the power supply is connected with the microprocessor; the power supply is also connected to the transmission device.
The microprocessor is an enhanced STM32 chip with a main frequency of 72MHz, the functions of the chip comprise analog-to-digital conversion, high-speed sampling, data comparison and parallel/serial transmission conversion, and the sampling frequency is set to be 100 KHz.
The transmission equipment is WiFi transmission equipment.
The alternating current conversion circuit is a voltage division circuit consisting of a small transformer or a resistor.
The background terminal is an integrated comprehensive processing device, and the integrated comprehensive processing device has the functions of receiving signals, processing the signals and providing a human-computer interaction interface.
The data memory is NOR Flash.
As shown in fig. 2, a detection method of a real-time detection device for a multi-path capacitive voltage transformer includes the following steps:
step A: in each voltage acquisition and transmission module, an alternating current conversion circuit reduces the voltage of the real-time voltage acquired by the capacitor voltage transformer to obtain an analog signal;
and B: d, the microprocessor carries out AD conversion on the analog signal obtained in the step A to obtain a digital signal;
and C: b, judging whether the digital signal obtained in the step B has mutation, and if the digital signal has mutation, storing the digital signal with mutation into an abnormal data memory;
step D: b, processing the digital signal obtained in the step B;
step E: the mutation signal in the step C and the signal obtained in the step D are serially transmitted to the transmission equipment through the parallel/serial transmission conversion module, and then are transmitted to the background terminal by the transmission equipment;
step F: the background terminal carries out secondary comparison processing on the signals transmitted by each voltage acquisition and transmission module;
step G: and feeding back the comparison result to a worker.
The step D specifically comprises the following steps:
when the signal obtained in the step B is normal, carrying out periodic averaging on the signal, wherein each period is one minute, and then outputting average data; when the signal obtained in the step B has mutation, recording the mutation signal, replacing the average data of one minute with the mutation signal, and then outputting the mutation signal.
The step F specifically comprises the following steps:
step 1: the background terminal divides the same number of logic units according to the number of signals transmitted by the voltage acquisition and transmission module;
step 2: the background terminal finds out a sudden change signal in the signals transmitted by the voltage acquisition and transmission module, and marks a problem that the capacitive voltage transformer has in a corresponding logic unit;
and step 3: the background terminal adds the data without the mutation signals to calculate an average value, stores the average value into each logic unit except the logic unit marked in the step 2, simultaneously stores the data obtained by the corresponding voltage acquisition and transmission module into the respective logic unit, compares the respective data with the average value, and obtains an offset value;
and 4, step 4: and comparing the deviation value with a set corresponding deviation threshold value of the voltage grade, and if the deviation value exceeds the threshold value, reporting the abnormal information of the capacitor voltage transformer.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (6)

1. A real-time detection device for a multi-path capacitive voltage transformer is characterized by comprising a plurality of paths of voltage acquisition and transmission modules and a background terminal, wherein each path of voltage acquisition and transmission module is connected with the background terminal in a wireless communication mode; each voltage acquisition and transmission module comprises a capacitor voltage transformer, an alternating current conversion circuit, a microprocessor, a power supply, a data memory and transmission equipment which are connected with each other; the alternating current conversion circuit is connected with the capacitor voltage transformer; the alternating current conversion circuit is also connected with the microprocessor; the microprocessor is also connected with the transmission equipment; the microprocessor is also connected with the data memory; the power supply is connected with the microprocessor; the power supply is also connected with the transmission equipment;
the detection device further comprises a program module, and the program module executes the following steps:
step A: in each voltage acquisition and transmission module, an alternating current conversion circuit reduces the voltage of the real-time voltage acquired by the capacitor voltage transformer to obtain an analog signal;
and B: d, the microprocessor carries out AD conversion on the analog signal obtained in the step A to obtain a digital signal;
and C: b, judging whether the digital signal obtained in the step B has mutation, and if the digital signal has mutation, storing the digital signal with mutation into an abnormal data memory;
step D: b, processing the digital signal obtained in the step B;
step E: the mutation signal in the step C and the signal obtained in the step D are serially transmitted to the transmission equipment through the parallel/serial transmission conversion module, and then are transmitted to the background terminal by the transmission equipment;
step F: the background terminal carries out secondary comparison processing on the signals transmitted by each voltage acquisition and transmission module;
step G: feeding back the comparison result to the staff;
the step D is as follows:
when the signal obtained in the step B is normal, carrying out periodic averaging on the signal, wherein each period is one minute, and then outputting average data; when the signal obtained in the step B has mutation, recording mutation information, replacing average data of one minute with the mutation signal, and then outputting the mutation signal;
the step F is specifically as follows:
step 1: the background terminal divides the same number of logic units according to the number of signals transmitted by the voltage acquisition and transmission module;
step 2: the background terminal finds out a sudden change signal in the signals transmitted by the voltage acquisition and transmission module, and marks a problem that the capacitive voltage transformer has in a corresponding logic unit;
and step 3: the background terminal adds the data without the mutation signals to calculate an average value, stores the average value into each logic unit except the logic unit marked in the step 2, simultaneously stores the data obtained by the corresponding voltage acquisition and transmission module into the respective logic unit, compares the respective data with the average value, and obtains an offset value;
and 4, step 4: and comparing the deviation value with a set corresponding deviation threshold value of the voltage grade, and if the deviation value exceeds the threshold value, reporting the abnormal information of the capacitor voltage transformer.
2. The detection device according to claim 1, wherein the microprocessor is a main frequency 72MHz enhanced STM32 chip, the chip functions include analog-to-digital conversion, high-speed sampling, data comparison, and parallel/serial transmission conversion, and the sampling frequency is set to 100 KHz.
3. The apparatus according to claim 1, wherein the transmission device is a WiFi transmission device.
4. The detecting device for detecting the rotation of a motor rotor according to claim 1, wherein the alternating current converting circuit is a voltage dividing circuit consisting of a miniature transformer or a resistor.
5. The detection device according to claim 1, wherein the background terminal is an integrated processing device, and functions of the integrated processing device include signal receiving, signal processing and human-computer interaction interface providing.
6. The detecting device for detecting the rotation of a motor rotor according to the claim 1, wherein the data memory is NOR Flash.
CN201710350512.4A 2017-05-17 2017-05-17 Multi-path capacitive voltage transformer real-time detection device Active CN107607764B (en)

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Application Number Priority Date Filing Date Title
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CN107607764B true CN107607764B (en) 2020-08-04

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080157783A1 (en) * 2007-01-01 2008-07-03 Maxwell Technologies, Inc. Apparatus and method for monitoring high voltage capacitors
CN102129763A (en) * 2011-01-10 2011-07-20 北京交通大学 CVT (Capacitor Voltage Transformer) online monitoring system
CN103454517B (en) * 2013-06-26 2016-05-11 广东电网公司佛山供电局 Capacitance type potential transformer on-line monitoring method
CN105182268A (en) * 2014-05-29 2015-12-23 国网山西省电力公司电力科学研究院 Method and device for monitoring operating state of capacitor voltage transformer
CN105548943B (en) * 2016-01-25 2018-06-19 中国南方电网有限责任公司超高压输电公司梧州局 A kind of CVT capacitance on-line monitoring methods based on the monitoring of CVT secondary voltages

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