CN105259397A - Electronic voltage transformer - Google Patents

Abstract

The invention relates to an electronic voltage transformer, the voltage transformer includes an electronic voltage transformer main body, an excitation detector and a Freescale IMX6 processing chip, and the excitation detector is used to monitor the electronic voltage transformer Excitation detection is performed on the shell of the main body, and the Freescale IMX6 processing chip receives the excitation detection result and determines the defect type of the shell of the electronic voltage transformer main body based on the excitation detection result. Through the invention, while optimizing the structure of the electronic voltage transformer, self-testing of multiple parameters of the electronic voltage transformer can be realized.

Description

Electronic voltage transformer

technical field

The invention relates to the field of electric power, in particular to an electronic voltage transformer.

Background technique

The working principle of the transformer is as follows: In the power supply line, the current difference is from a few amps to tens of thousands of amps, and the voltage difference is from a few volts to several million volts. The current and voltage in the line are relatively high, such as direct measurement is very dangerous. In order to facilitate the measurement of the secondary instrument, it needs to be converted into a relatively uniform current and voltage, and the transformer is used to play the role of variable current, variable voltage and electrical isolation. Most of the display instruments are pointer-type current and voltmeters, so most of the secondary currents of the current transformers are ampere-level (such as 5, etc.). With the development of the times, most of the power measurement has reached digitalization, and the signal sampled by the computer is generally in the milliampere level (0-5V, 4-20mA, etc.). The secondary current of the miniature current transformer is milliamp level, which mainly acts as a bridge between the large transformer and the sampling. Miniature current transformers are called "instrument current transformers".

With the rapid development of optoelectronic technology, many technologically developed countries have turned their attention to the use of optical sensing technology and electronic methods to develop new electronic current transformers, referred to as photoelectric current transformers. The International Electrotechnical Society has published standards for electronic voltage transformers. The meaning of electronic transformers includes not only photoelectric transformers, but also various other voltage and current sensors that use electronic testing principles.

However, the electronic voltage transformer in the prior art has high structural redundancy and high cost, which is too cost-effective for the power supply management department that uses voltage transformers in large quantities. At the same time, the electronic voltage transformer in the prior art The controller lacks some necessary on-site parameter detection equipment, resulting in poor real-time performance of on-site data transmission, which easily delays the processing time of on-site faults.

For this reason, the present invention proposes an electronic voltage transformer. Firstly, the structure of the electronic voltage transformer in the prior art is optimized to improve its cost performance. In addition, some on-site parameter detection equipment is added, and a self-check mechanism is added to improve the electronic voltage transformer. Intelligent level of type voltage transformer.

Contents of the invention

In order to solve the technical problems existing in the prior art, the present invention provides an electronic voltage transformer. On the one hand, it de-redundantizes the structure of the electronic voltage transformer in the prior art, while ensuring product quality , Simplify the structure of the equipment; on the other hand, integrate the infrared imager and the excitation imager into the electronic voltage transformer to improve the self-test performance of the electronic voltage transformer.

According to one aspect of the present invention, an electronic voltage transformer is provided, the voltage transformer includes an electronic voltage transformer main body, an excitation detector and a Freescale IMX6 processing chip, and the excitation detector is used for detecting the Excitation detection is performed on the shell of the main body of the electronic voltage transformer, and the Freescale IMX6 processing chip receives the excitation detection result and determines the defect type of the shell of the main body of the electronic voltage transformer based on the excitation detection result.

More specifically, in the electronic voltage transformer, it includes: an infrared imager, arranged on the opposite side of the first casing, for detecting the temperature of the first casing in real time, and when the detected temperature exceeds the preset casing temperature range , an abnormal signal of the casing temperature is sent; the excitation detector excites the first casing to obtain the feedback excitation data, and obtains the inflection point voltage, the inflection point current, the resistance conversion value of the first casing at 25 degrees and the first casing The resistance conversion value at 75 degrees, based on the inflection point voltage, the inflection point current, the resistance conversion value of the first housing at 25 degrees, and the resistance conversion value of the first housing at 75 degrees, determine the defect type of the first housing; electronic voltage Transformer main body, including first shell, second shell, high-voltage bus, air-core coil, iron core coil, signal conditioning circuit, analog-to-digital conversion circuit, data receiving equipment, data sending equipment, electro-optic conversion equipment, downlink optical fiber, primary power supply, secondary Secondary power supply, upstream optical fiber, photoelectric conversion equipment, CPLD chip, Freescale IMX6 processing chip, liquid crystal display and Bluetooth communication equipment; the first shell is used to accommodate high-voltage busbars, air-core coils, iron-core coils, signal conditioning circuits, modules Conversion circuit, data receiving device, data sending device, electro-optic conversion device and primary power supply; the second housing is used to accommodate secondary power supply, photoelectric conversion device, CPLD chip, Freescale IMX6 processing chip, display device and Bluetooth communication device; The high-voltage bus passes through the air-core coil and the iron-core coil; the air-core coil is used as the sensing head of the protection channel; the iron-core coil is used as the sensing head of the measurement channel; the signal conditioning circuit receives the signal output by the iron-core coil, including the filter processing sub The circuit, the phase-shifting processing sub-circuit and the amplification processing sub-circuit are used to sequentially filter, phase-shift and amplify the signal output by the core coil, and output the processed signal; the analog-to-digital conversion circuit is connected with the signal conditioning circuit for Perform 8-bit analog-to-digital conversion on the signal output by the signal conditioning circuit; the data receiving device is connected to the analog-to-digital conversion circuit through the SPI interface, and the received data is combined and CRC checked; the data sending device is calibrated through the SPI interface. The verified data is sent to the electro-optical conversion device, and the verified data is in parallel mode; the electro-optic conversion device transmits the verified data through the downlink optical fiber; the photoelectric conversion device receives the verified data through the uplink optical fiber The data; CPLD chip, realizes the simultaneous reception of multi-channel parallel verified data, and performs parallel-to-serial conversion to obtain multi-channel serial verified data; Freescale IMX6 processing chip, realizes the connection with CPLD chip The bus interface is connected and connected to the Bluetooth communication device; the Bluetooth communication device is connected to the infrared imager to receive the temperature of the first shell and the abnormal signal of the shell temperature, and the Bluetooth communication device is connected to the excitation detector to receive the inflection point voltage, the inflection point current, the second The converted value of the resistance of the first case at 25 degrees and the converted value of the resistance of the first case at 75 degrees, based on the inflection point voltage, the inflection point current, the converted value of the resistance of the first case at 25 degrees and the first case at 75 degrees of The resistance conversion value determines the defect type of the first shell; the bluetooth communication device is used to wirelessly send the temperature of the first shell, the abnormal signal of the shell temperature, and the defect type of the first shell to the remote measurement server, and is also used to send multiple The calibrated data of the serial line is sent wirelessly to the remote measurement server; the primary power supply provides power supply for the signal conditioning circuit, analog-to-digital conversion circuit, data receiving equipment, data sending equipment and electro-optical conversion equipment; the secondary power supply , to provide power supply for photoelectric conversion equipment, CPLD chip, Freescale IMX6 processing chip, display device and Bluetooth communication device; liquid crystal display, connected with Freescale IMX6 processing chip, for real-time display of the temperature of the first shell, shell The abnormal temperature signal and the defect type of the first shell are also used to display the verified data of multiple serial lines in real time; wherein, the Bluetooth communication device includes a first search sub-device, a second search sub-device and a matching connector equipment; wherein, the first search sub-device, according to the concentration of the MAC address in the Bluetooth scatternet, determine the Bluetooth piconet with the highest concentration of the Bluetooth MAC address as the target piconet, a bluetooth scatternet is composed of multiple bluetooth piconets; the second search sub-device , connected to the first search sub-device, in the target piconet, looking for one or more bluetooth communication devices ranked first in terms of signal strength and whose number is not greater than 7 as one or more target bluetooth devices; Connect the sub-device, connect with the second search sub-device, start the bluetooth communication connection with the one or more target bluetooth devices; the data sent to the remote measurement server place is proportional to the analog-to-digital conversion circuit after the analog-to-digital conversion the corresponding data.

More specifically, in the electronic voltage transformer: when the number of Bluetooth communication devices with signals in the target piconet is greater than or equal to 7, the number of the one or more target Bluetooth devices is 7.

More specifically, in the electronic voltage transformer: when the number of bluetooth communication devices with signals in the target piconet is less than 7, the number of the one or more target bluetooth devices is the target piconet The number of Bluetooth communication devices in the network that have a signal.

More specifically, in the electronic voltage transformer: both the infrared imager and the excitation detector are embedded with bluetooth communication interfaces.

More specifically, in the electronic voltage transformer: the Freescale IMX6 processing chip and the CPLD chip are integrated on one integrated circuit board.

Description of drawings

Embodiments of the present invention will be described below in conjunction with the accompanying drawings, wherein:

Fig. 1 is a structural block diagram of the electronic voltage transformer of the present invention.

Fig. 2 is a structural block diagram of the Bluetooth communication device of the electronic voltage transformer of the present invention.

Reference signs: 1 main body of electronic voltage transformer; 2 excitation detector; 3 Freescale IMX6 processing chip 4 first search sub-device; 5 second search sub-device; 6 matching connection sub-device

detailed description

Embodiments of the electronic voltage transformer of the present invention will be described in detail below with reference to the accompanying drawings.

With the continuous application of many new materials, many new types of transformers have emerged, and electromagnetic transformers have been fully developed. Among them, iron-core current transformers have various structures such as dry type, oil-immersed type, and gas-insulated type. Adapted to the development needs of electric power construction. However, with the continuous increase of power transmission capacity, the continuous improvement of grid voltage level and the continuous improvement of protection requirements, the general iron core current transformer structure has gradually exposed its incompatible weaknesses. Weaknesses such as saturation, ferromagnetic resonance, small dynamic range, and narrow frequency band are difficult to meet the development needs of the new generation of power system automation and power digital network. Therefore, electronic voltage and current transformers appeared.

Electronic transformer, through the AC sampling of the input voltage and current signals, and then connect the sampled value with the digital input secondary instrument through the cable, optical fiber and other transmission systems, and the digital input secondary instrument can sample the voltage and current By performing calculations, parameters such as voltage RMS, current RMS, fundamental voltage, fundamental current, harmonic voltage, harmonic current, active power, fundamental power, and harmonic power can be obtained.

However, the electronic voltage transformer in the prior art has an unreasonable structure, low cost performance, and cannot be widely used. Moreover, it is still unable to realize self-inspection of the temperature and defect type of the primary equipment shell.

For this reason, the present invention builds an electronic voltage transformer, optimizes the electronic voltage transformer in the prior art, improves the cost performance of the electronic voltage transformer, and more importantly, combines the temperature and defect of the primary equipment shell The type-related detection equipment is integrated into the electronic voltage transformer, and the wireless transmission equipment is further improved to improve the efficiency of wireless data transmission, thereby increasing the fault detection speed.

Fig. 1 is the structural block diagram of electronic voltage transformer of the present invention, and described voltage transformer comprises electronic type voltage transformer main body, excitation detector and Freescale IMX6 processing chip, and described excitation detector is used for described electronic The casing of the electronic voltage transformer main body is subjected to excitation detection, and the Freescale IMX6 processing chip receives the excitation detection result and determines the defect type of the casing of the electronic voltage transformer main body based on the excitation detection result.

Next, the structure of the electronic voltage transformer of the present invention will be specifically described.

The voltage transformer includes: an infrared imager, arranged on the opposite side of the first casing, for real-time detection of the temperature of the first casing, and when the detected temperature exceeds the preset casing temperature range, an abnormal casing temperature signal is sent.

The voltage transformer includes: an excitation detector, which excites the first casing to obtain the feedback excitation data, and obtains the inflection point voltage, the inflection point current, the resistance conversion value of the first casing at 25 degrees and the first casing at 25 degrees according to the excitation data. The resistance conversion value at 75 degrees is based on the inflection point voltage, the inflection point current, the resistance conversion value of the first housing at 25 degrees, and the resistance conversion value of the first housing at 75 degrees to determine the defect type of the first housing.

The voltage transformer includes: an electronic voltage transformer main body, including a first shell, a second shell, a high-voltage bus, an air-core coil, an iron core coil, a signal conditioning circuit, an analog-to-digital conversion circuit, a data receiving device, a data sending device, an electro-optic Conversion equipment, downlink optical fiber, primary power supply, secondary power supply, uplink optical fiber, photoelectric conversion equipment, CPLD chip, Freescale IMX6 processing chip, liquid crystal display and Bluetooth communication equipment; the first shell is used to accommodate high-voltage busbars and air-core coils , core coil, signal conditioning circuit, analog-to-digital conversion circuit, data receiving equipment, data sending equipment, electro-optical conversion equipment and primary power supply; the second shell is used to accommodate secondary power supply, photoelectric conversion equipment, CPLD chip, Freescale IMX6 Processing chips, display devices and Bluetooth communication devices; high-voltage busbars, passing through air-core coils and iron-core coils.

The voltage transformer includes: an air-core coil used as a sensing head of a protection channel; an iron-core coil used as a sensing head of a measuring channel.

The voltage transformer includes: a signal conditioning circuit, receiving the signal output by the core coil, including a filtering processing sub-circuit, a phase-shifting processing sub-circuit and an amplification processing sub-circuit, which are used to sequentially filter, phase-shift and amplify the signal output by the core coil Amplify and process, and output the processed signal; the analog-to-digital conversion circuit is connected with the signal conditioning circuit, and is used for performing 8-bit analog-to-digital conversion on the signal output by the signal conditioning circuit.

The voltage transformer includes: a data receiving device, which is connected to an analog-to-digital conversion circuit through an SPI interface, and performs combination and CRC check on the received data; a data sending device, which sends the verified data to the electro-optic converter through the SPI interface. equipment, the verified data is in parallel mode; the electro-optical conversion device transmits the verified data through the downlink optical fiber; the photoelectric conversion device receives the verified data through the uplink optical fiber.

The voltage transformer includes: a CPLD chip, capable of simultaneously receiving multi-channels of parallel verified data and performing parallel-to-serial conversion to obtain multi-channels of serial verified data.

Described voltage transformer comprises: Freescale IMX6 processing chip, realizes being connected with the bus interface of CPLD chip and mounts bluetooth communication device; Connect with infrared imager to receive the temperature of first casing and casing temperature abnormal signal by bluetooth communication device , connected to the excitation detector through a Bluetooth communication device to receive the inflection point voltage, the inflection point current, the resistance conversion value of the first shell at 25 degrees, and the resistance conversion value of the first shell at 75 degrees, and based on the inflection point voltage, inflection point current, The converted resistance value of the first enclosure at 25 degrees and the converted resistance value of the first enclosure at 75 degrees determine the defect type of the first enclosure.

The voltage transformer includes: a bluetooth communication device, which is used to wirelessly send the temperature of the first shell, the abnormal signal of the shell temperature and the defect type of the first shell to the remote measurement server, and is also used to transmit the multi-channel serial The verified data is sent wirelessly to the remote measurement server; the primary power supply provides power supply for the signal conditioning circuit, analog-to-digital conversion circuit, data receiving equipment, data sending equipment, and electro-optical conversion equipment; the secondary power supply provides power for the photoelectric conversion equipment, CPLD chip, Freescale IMX6 processing chip, display device and bluetooth communication device provide power supply; liquid crystal display screen, connected with Freescale IMX6 processing chip, is used for real-time displaying the temperature of the first shell, shell temperature abnormal signal and The defect type of the first shell is also used to display the verified data of multiple serial lines in real time.

With reference to Fig. 2, wherein, described bluetooth communication device comprises first search sub-device, second search sub-device and matching connection sub-device; Wherein, first search sub-device, determine bluetooth MAC address concentration according to the MAC address concentration in the bluetooth scatternet The highest bluetooth piconet is used as the target piconet, and a bluetooth scatternet is made up of a plurality of bluetooth piconets; The second search sub-device is connected with the first search sub-device, and in the target piconet, search for One or more bluetooth communication devices with the number not greater than 7 in the top ranking are used as one or more target bluetooth devices; match the connection sub-device, connect with the second search sub-device, and start connecting with the one or more target The Bluetooth communication connection of the Bluetooth device; the data sent to the remote measurement server is directly proportional to the corresponding data after analog-to-digital conversion by the analog-to-digital conversion circuit.

Optionally, in the electronic voltage transformer: when the number of Bluetooth communication devices with signals in the target piconet is greater than or equal to 7, the number of the one or more target Bluetooth devices is 7; When the number of bluetooth communication devices with signals in the target piconet is less than 7, the number of the one or more target bluetooth devices is the number of bluetooth communication devices with signals in the target piconet; infrared imager Both the Bluetooth communication interface and the excitation detector are embedded; and the Freescale IMX6 processing chip and the CPLD chip can be integrated on an integrated circuit board.

In addition, a filter, as the name suggests, is a device that filters waves. "Wave" is a very broad physical concept. In the field of electronic technology, "wave" is narrowly limited to the process of describing the fluctuation of the value of various physical quantities with time. This process is converted into a time function of voltage or current through the action of various sensors, which is called the time waveform of various physical quantities, or called a signal. Because the independent variable time is continuously valued, it is called a continuous time signal, and it is also customarily called an analog signal.

With the emergence and rapid development of digital electronic computer technology, in order to facilitate the processing of signals by computers, a complete theory and method for transforming continuous time signals into discrete time signals under the guidance of the sampling theorem has been produced. That is to say, the original signal can be expressed by using only the sample values of the original analog signal at a series of discrete time coordinate points without losing any information. Since the concepts of wave, waveform, and signal express the changes of various physical quantities in the objective world, Nature is the carrier of all kinds of information on which modern society depends. Information needs to be disseminated, relying on the transmission of waveform signals. The signal may be distorted due to the existence of environment and interference in every link of its generation, conversion and transmission, and even in quite a few cases, the distortion is still serious, resulting in the signal and the information it carries being deeply distorted. Buried deep in the noise. In order to filter out these noises and restore the original signal, it is necessary to use various filters for filtering.

Using the electronic voltage transformer of the present invention, aiming at the technical problems of high cost, lack of related self-test equipment and low working efficiency of wireless transmission equipment in the prior art, through the structural transformation of the electronic voltage transformer, Simplify the internal structure of the original electronic voltage transformer, at the same time, integrate a series of parameter detection equipment to detect the primary equipment, and improve the communication processing mechanism of the wireless transmission equipment, thereby improving the automation level of the electronic voltage transformer.

It can be understood that although the present invention has been disclosed above with preferred embodiments, the above embodiments are not intended to limit the present invention. For any person skilled in the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or to be modified into equivalent changes, etc. effective example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention, which do not deviate from the technical solution of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims (6)

1. A kind of electronic voltage transformer, described voltage transformer comprises electronic voltage transformer main body, excitation detector and Freescale IMX6 processing chip, and described excitation detector is used for described electronic voltage transformer main body The casing of the electronic voltage transformer is subjected to excitation detection, and the Freescale IMX6 processing chip receives the excitation detection result and determines the defect type of the casing of the main body of the electronic voltage transformer based on the excitation detection result. 2. The electronic voltage transformer according to claim 1, wherein the voltage transformer comprises: The infrared imager is arranged on the opposite side of the first casing, and is used for real-time detection of the temperature of the first casing, and when the detected temperature exceeds the preset casing temperature range, an abnormal casing temperature signal is sent; The excitation detector excites the first casing to obtain the feedback excitation data, and obtains the inflection point voltage, the inflection point current, the resistance conversion value of the first casing at 25 degrees and the resistance conversion value of the first casing at 75 degrees according to the excitation data , determining the defect type of the first enclosure based on the inflection point voltage, the inflection point current, the converted resistance value of the first enclosure at 25 degrees, and the converted resistance value of the first enclosure at 75 degrees; The main body of the electronic voltage transformer, including the first shell, the second shell, the high-voltage busbar, the hollow coil, the iron core coil, the signal conditioning circuit, the analog-to-digital conversion circuit, the data receiving device, the data sending device, the electro-optical conversion device, the downlink optical fiber, the primary Power supply, secondary power supply, uplink optical fiber, photoelectric conversion equipment, CPLD chip, Freescale IMX6 processing chip, LCD display and Bluetooth communication equipment; The first shell is used to accommodate the high-voltage busbar, air-core coil, iron-core coil, signal conditioning circuit, analog-to-digital conversion circuit, data receiving device, data sending device, electro-optical conversion device and primary power supply; The second shell is used to accommodate secondary power supply, photoelectric conversion equipment, CPLD chip, Freescale IMX6 processing chip, display device and Bluetooth communication device; High-voltage busbars, passing through air-core coils and iron-core coils; Hollow coil, used as the sensor head of the protection channel; Iron core coil, used as the sensing head of the measuring channel; The signal conditioning circuit receives the signal output by the core coil, including a filter processing sub-circuit, a phase-shift processing sub-circuit and an amplification processing sub-circuit, which are used to sequentially filter, phase-shift and amplify the signal output by the core coil, and output the processed signal of; The analog-to-digital conversion circuit is connected with the signal conditioning circuit, and is used for performing 8-bit analog-to-digital conversion on the signal output by the signal conditioning circuit; The data receiving device is connected to the analog-to-digital conversion circuit through the SPI interface, and the received data is combined and CRC checked; The data sending device sends the verified data to the electro-optical conversion device through the SPI interface, and the verified data is in parallel mode; Electro-optical conversion equipment, which transmits the verified data through the downlink optical fiber; A photoelectric conversion device that receives the verified data through an uplink optical fiber; The CPLD chip can simultaneously receive multi-channel parallel verified data and perform parallel-to-serial conversion to obtain multi-channel serial verified data; The Freescale IMX6 processing chip realizes the connection with the bus interface of the CPLD chip and connects the Bluetooth communication device; connects with the infrared imager through the Bluetooth communication device to receive the temperature of the first shell and the abnormal signal of the shell temperature, and communicates with the excitation signal through the Bluetooth communication device The detector is connected to receive the knee voltage, the knee current, the converted value of the resistance of the first enclosure at 25 degrees, and the converted value of the resistance of the first enclosure at 75 degrees, and based on the knee voltage, the knee current, the first enclosure at 25 degrees The resistance conversion value of the resistance conversion value and the resistance conversion value of the first casing at 75 degrees determine the defect type of the first casing; The Bluetooth communication device is used to wirelessly send the temperature of the first casing, the abnormal signal of the casing temperature and the defect type of the first casing to the remote measurement server, and is also used to wirelessly send the multi-channel serially verified data to the remote measurement server; Primary power supply, providing power supply for signal conditioning circuit, analog-to-digital conversion circuit, data receiving equipment, data sending equipment and electro-optical conversion equipment; Secondary power supply, providing power supply for photoelectric conversion equipment, CPLD chip, Freescale IMX6 processing chip, display device and Bluetooth communication device; The liquid crystal display is connected with the Freescale IMX6 processing chip, which is used to display the temperature of the first shell, the abnormal signal of the shell temperature and the defect type of the first shell in real time, and is also used to display the verified data of multiple serial lines in real time ; Wherein, the Bluetooth communication device includes a first search sub-device, a second search sub-device, and a matching connection sub-device; wherein, the first search sub-device determines the Bluetooth pico with the highest concentration of Bluetooth MAC addresses according to the concentration of MAC addresses in the Bluetooth scatternet. Network as the target piconet, a Bluetooth scatternet is composed of multiple bluetooth piconets; the second search sub-device is connected with the first search sub-device, and in the target piconet, search for the top ranked by signal strength 1. One or more Bluetooth communication devices whose number is not greater than 7 are used as one or more target Bluetooth devices; match the connection sub-device, connect with the second search sub-device, and start Bluetooth communication with the one or more target Bluetooth devices communication connection; Wherein, the data sent to the remote measurement server is directly proportional to the corresponding data after analog-to-digital conversion by the analog-to-digital conversion circuit. 3. The electronic voltage transformer as claimed in claim 2, characterized in that: When the number of Bluetooth communication devices with signals in the target piconet is greater than or equal to 7, the number of the one or more target Bluetooth devices is 7. 4. The electronic voltage transformer as claimed in claim 2, characterized in that: When the number of Bluetooth communication devices with signals in the target piconet is less than 7, the number of the one or more target Bluetooth devices is the number of Bluetooth communication devices with signals in the target piconet. 5. The electronic voltage transformer as claimed in claim 2, characterized in that: Both the infrared imager and the excitation detector are embedded with a Bluetooth communication interface. 6. The electronic voltage transformer as claimed in claim 2, characterized in that: Freescale IMX6 processing chip and CPLD chip are integrated on an integrated circuit board.