CN112526434A - On-site wireless calibration device and method for direct current transformer - Google Patents
On-site wireless calibration device and method for direct current transformer Download PDFInfo
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Abstract
The invention discloses a field wireless calibration device and method for a direct current transformer, and belongs to the technical field of intelligent equipment. The device of the invention comprises: the checking host computer and the checking slave computer, the checking host computer includes: the system comprises a wireless synchronization module, a control module, a data acquisition module and a wireless transmission module; the verification slave includes: the device comprises a wireless synchronization module, a control module, a data acquisition module and a wireless transmission module. The method can overcome the defect of repeated field calibration of the direct current transformer, greatly saves the field calibration time of the direct current transformer and improves the field calibration work efficiency.
Description
Technical Field
The invention relates to the technical field of intelligent equipment, in particular to an on-site wireless calibration device and method for a direct current transformer.
Background
Compared with the traditional extra-high voltage alternating current transmission technology, the extra-high voltage direct current transmission technology has the advantages of long distance, large capacity, no synchronization problem, low loss and the like. The direct current voltage transformer is used as key measuring equipment for providing voltage signals for control and protection of a direct current transmission system in an extra-high voltage direct current transmission project, and the quality of the measuring performance of the direct current voltage transformer is directly related to safe and stable operation of the direct current transmission system. At present, direct measurement methods are basically adopted for calibrating the direct current transformers, namely, secondary sampling values of a standard transformer and a calibrated transformer are directly measured and converted into primary values, and then error calculation is carried out. The direct current voltage divider body of the direct current transformer and a secondary measurement system thereof are respectively arranged in a direct current field and a control room, the distance between two places is hundreds of meters, and the practical problem to be solved when the direct current transformer is calibrated on site is to synchronously measure secondary signals of a standard transformer and a measured transformer and calculate relative errors. On site, two schemes, namely wired and wireless, are usually adopted to perform on-site calibration on the dc transformer, and the wired calibration scheme is to transmit a secondary signal of the dc transformer to be tested to a calibration device through a long-distance cable and an optical fiber for calibration. The wireless calibration scheme is generally to transmit a secondary signal of the tested dc transformer to the calibration device for calibration in an intercom or wireless WIFI local area network manner. At present, research institutions such as the Chinese institute of electrical science, namely the metrological research institute, the institute of the Xian high-voltage electrical apparatus, the national grid company provincial institute of electrical science and the like actively develop scientific research and experimental capacity construction work related to the field calibration of the direct current transformer.
Because direct current transformer calibration usually during the maintenance of converter station, the site environment is complicated, there are a lot of drawbacks in the implementation of wired calibration scheme, and the long distance cable of laying is easily damaged and influences other site personnel operation construction, the scheme of the long-range tally of intercom, and the check-up work load is big and consuming time, and wireless WIFI LAN mode transmission distance is short, needs to build a plurality of extra network relay equipment at the scene. In addition, considering that the output signal of the direct current transformer needs to be provided for a control and protection system and a redundancy backup of the converter station, each direct current voltage transformer is generally provided with a plurality of sets of independent secondary measurement systems, so that each direct current voltage transformer needs to perform a plurality of field verification tests, the field verification of the direct current transformer is long in time consumption and low in efficiency, and the direct current high-voltage power supply needs to operate under the rated voltage for a long time, so that certain potential safety hazard is brought to the field verification.
Disclosure of Invention
In order to solve the above problems, the present invention provides an on-site wireless calibration apparatus for a dc transformer, including:
a verification host, the verification host comprising:
the wireless synchronization receiving module receives and analyzes the Beidou synchronous signal and outputs the second pulse synchronous trigger signal and the time scale information of the current second pulse synchronous trigger signal;
the control module outputs a sampling control signal to the data sampling module at the rising edge of each pulse per second synchronous trigger signal sent by the wireless synchronization module, compares a sampling value sequence and time scale information of the standard mutual inductor with a sampling value sequence and time scale information of the tested mutual inductor, selects relative errors of the sampling value of the standard mutual inductor and the sampling value of the tested mutual inductor, which are the same as the sampling value sequence of the standard mutual inductor, and verifies the tested mutual inductor according to the relative errors;
the data sampling module receives the sampling control signal, samples the standard mutual inductor signal, stores the sampling value of the standard mutual inductor and the time scale information corresponding to the sampling value, and generates a sampling value sequence and time scale information of the standard mutual inductor;
the wireless transmission module receives a sampling value of the tested mutual inductor stored by the cloud server and time mark information corresponding to the sampling value, and generates a sampling value sequence and time mark information of the tested mutual inductor;
a checking slave, said checking slave comprising:
the wireless synchronization receiving module receives and analyzes the Beidou synchronous signal and outputs the second pulse synchronous trigger signal and the time scale information of the current second pulse synchronous trigger signal;
the control module outputs a sampling control signal to the data sampling module at the rising edge of each pulse per second synchronous trigger signal sent by the wireless synchronization module;
the data sampling module receives the sampling control signal, samples the signal of the tested mutual inductor and stores the sampling value of the tested mutual inductor and the time scale information corresponding to the sampling value;
and the wireless transmission module uploads the sampling value of the tested mutual inductor collected by the data collection module and the time scale information corresponding to the sampling value to the cloud server.
Optionally, the structure of the checking master machine is the same as that of the checking slave machine, the checking master machine includes 1, and the checking slave machine includes a plurality of checking slave machines.
Optionally, the wireless synchronization module is provided with a Beidou time service signal input interface, a second pulse signal output interface and a serial port output interface.
Optionally, the data acquisition module has a dc voltage measurement interface, a pulse-per-second trigger sampling interface, and a data transmission interface, and communicates with the control module through an IEEE488.2 standard protocol, a USB transmission protocol, and a TCP/IP ethernet protocol.
The invention also provides a field wireless calibration method for the direct current transformer, which comprises the following steps:
receiving and analyzing the Beidou synchronous signal, and outputting the second pulse synchronous trigger signal and the time scale information of the current second pulse synchronous trigger signal;
outputting a sampling control signal at the rising edge of each pulse per second synchronous trigger signal;
sampling a standard transformer signal and a measured transformer signal according to a control signal, storing a sampling value of the standard transformer and time scale information corresponding to the sampling value, generating a sampling value sequence and time scale information of the standard transformer, storing the sampling value of the measured transformer and the time scale information corresponding to the sampling value, and generating the sampling value sequence and the time scale information of the measured transformer;
comparing the time scale information corresponding to the sampling value of the standard mutual inductor with the time scale information corresponding to the sampling value of the tested mutual inductor;
selecting a sampling value of a standard mutual inductor with the same time scale information as the measured mutual inductor and a sampling value of the measured mutual inductor, calculating the relative error between the sampling value of the standard mutual inductor and the sampling value of the measured mutual inductor when the time scale information is the same, and carrying out error check on the measured mutual inductor according to the relative error.
The invention can realize remote wireless synchronous sampling and data transmission, can solve the defects caused by the remote transmission of the on-site calibration sampling signals of the direct current transformer, is based on a distributed deployment structure, is provided with a calibration host and a plurality of calibration slaves, can perform multi-channel data synchronous acquisition and transmission of a plurality of tested transformers or a single tested transformer, realizes the simultaneous calibration of multi-channel output signals of the direct current transformer, can solve the defects of the on-site multiple calibration of the direct current transformer, greatly saves the on-site calibration time of the direct current transformer, and improves the on-site calibration working efficiency.
Drawings
FIG. 1 is a structural diagram of an on-site wireless calibration device for a direct current transformer of the invention;
FIG. 2 is a structural diagram of a checking master machine or a checking slave machine of the on-site wireless checking device for the direct current transformer, which is disclosed by the invention;
FIG. 3 is a time scale alignment chart of data of a sampling value of a checking host or a checking slave of the on-site wireless checking device for the direct-current transformer;
fig. 4 is a flowchart of an on-site wireless calibration method for a dc transformer according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides an on-site wireless calibration device for a direct current transformer, as shown in fig. 1, comprising:
a verification host, the verification host comprising:
the wireless synchronization receiving module receives and analyzes the Beidou synchronous signal and outputs the second pulse synchronous trigger signal and the time scale information of the current second pulse synchronous trigger signal;
the control module outputs a sampling control signal to the data sampling module at the rising edge of each pulse per second synchronous trigger signal sent by the wireless synchronization module, compares a sampling value sequence and time scale information of the standard mutual inductor with a sampling value sequence and time scale information of the tested mutual inductor, selects relative errors of the sampling value of the standard mutual inductor and the sampling value of the tested mutual inductor, which are the same as the sampling value sequence of the standard mutual inductor, and verifies the tested mutual inductor according to the relative errors;
the data sampling module receives the sampling control signal, samples the standard mutual inductor signal, stores the sampling value of the standard mutual inductor and the time scale information corresponding to the sampling value, and generates a sampling value sequence and time scale information of the standard mutual inductor;
the wireless transmission module receives a sampling value of the tested mutual inductor stored by the cloud server and time mark information corresponding to the sampling value, and generates a sampling value sequence and time mark information of the tested mutual inductor;
a checking slave, said checking slave comprising:
the wireless synchronization receiving module receives and analyzes the Beidou synchronous signal and outputs the second pulse synchronous trigger signal and the time scale information of the current second pulse synchronous trigger signal;
the control module outputs a sampling control signal to the data sampling module at the rising edge of each pulse per second synchronous trigger signal sent by the wireless synchronization module;
the data sampling module receives the sampling control signal, samples the signal of the tested mutual inductor and stores the sampling value of the tested mutual inductor and the time scale information corresponding to the sampling value;
and the wireless transmission module uploads the sampling value of the tested mutual inductor collected by the data collection module and the time scale information corresponding to the sampling value to the cloud server.
The structure of the checking master machine is the same as that of the checking slave machine, as shown in fig. 2, the checking master machine comprises 1 checking slave machine, and the checking slave machine comprises a plurality of checking slave machines.
The wireless synchronization module is provided with a Beidou time service signal input interface, a second pulse signal output interface and a serial port output interface;
receiving high-accuracy time service information of the Beidou satellite, analyzing time identification information (instant mark information) in the time service information in real time, outputting the time mark information in a character string hhmmss format, and outputting a second pulse synchronous trigger signal every whole second. The time mark information analyzed by the wireless synchronization modules is the same, and the second pulse synchronization trigger signal is synchronously output.
The data acquisition module is provided with a direct-current voltage measurement interface, a second pulse trigger sampling interface and a data transmission interface, is communicated with the control module through an IEEE488.2 standard protocol, a USB transmission protocol and a TCP/IP Ethernet protocol, triggers A/D sampling of the voltage measurement interface at the rising edge of the second pulse, and transmits a sampling value to the control module through the data transmission interface.
Continuously receiving the sampling value of the tested mutual inductor from the cloud server and the corresponding time scale information through the wireless transmission module to form a sampling value sequence of the tested mutual inductor, comparing the time scale information of the sampling value sequence of the standard mutual inductor with the time scale information of the sampling value sequence of the tested mutual inductor received through the wireless transmission module by the control module, and screening out the sampling value U of the standard mutual inductor corresponding to the same time scale information as shown in figure 3s-k1、Us-k2、Us-k3……Us-kmAnd the sampling value U of the tested transformer ntn-k1、Utn-k2、Utn-k3……Utn-kmRespectively calculating the relative errors of the sampling values of the standard mutual inductor and the tested mutual inductor n corresponding to the same time scale as follows:
wherein n is the serial number of the tested mutual inductor, and m is the serial number of the time scale. By the time mark alignment scheme, the sampling values for calculating the relative errors can be ensured to be the sampling values of the standard mutual inductor and the tested mutual inductor at the same time, and the influence of wireless transmission delay on error verification is eliminated.
The checking master machine and the checking slave machines are connected with the cloud server through the Ethernet through the wireless transmission module, the wireless transmission module adopts a DTU module with a 4G communication function and a serial port communication function, the wireless transmission module is subjected to parameter setting through an RS232 serial port of the control module, the IP address and the port of the cloud server connected with the wireless transmission module are arranged at the end of the wireless transmission module, the serial number and the connection password of the wireless transmission module for data transmission are arranged at the end of the cloud server, so that encrypted data transmission between the cloud server and the wireless transmission module is realized, the wireless transmission module corresponding to the checking master machine and the wireless transmission modules corresponding to the checking slave machines are arranged at the end of the cloud server for point-to-point data transmission, the cloud server receives data sent by the wireless transmission module of the checking slave machine and then forwards the data to the wireless transmission module of the checking master machine in real time, and wireless data transmission between the checking slave machines and, the control module of the checking host calculates relative errors between a plurality of output signal sampling values of a plurality of tested transformers or one tested transformer and output signal sampling values of a standard direct current transformer, and simultaneously realizes error checking of a plurality of output channels of the tested transformers or the tested mutual inductors.
The invention also provides an on-site wireless calibration method for the direct current transformer, as shown in fig. 4, comprising the following steps:
receiving and analyzing the Beidou synchronous signal, and outputting the second pulse synchronous trigger signal and the time scale information of the current second pulse synchronous trigger signal;
outputting a sampling control signal at the rising edge of each pulse per second synchronous trigger signal;
sampling a standard transformer signal and a measured transformer signal according to a control signal, storing a sampling value of the standard transformer and time scale information corresponding to the sampling value, generating a sampling value sequence and time scale information of the standard transformer, storing the sampling value of the measured transformer and the time scale information corresponding to the sampling value, and generating the sampling value sequence and the time scale information of the measured transformer;
comparing the time scale information corresponding to the sampling value of the standard mutual inductor with the time scale information corresponding to the sampling value of the tested mutual inductor;
selecting a sampling value of a standard mutual inductor with the same time scale information as the measured mutual inductor and a sampling value of the measured mutual inductor, calculating the relative error between the sampling value of the standard mutual inductor and the sampling value of the measured mutual inductor when the time scale information is the same, and carrying out error check on the measured mutual inductor according to the relative error.
The invention can realize remote wireless synchronous sampling and data transmission, can solve the defects caused by the remote transmission of the on-site calibration sampling signals of the direct current transformer, is based on a distributed deployment structure, is provided with a calibration host and a plurality of calibration slaves, can perform multi-channel data synchronous acquisition and transmission of a plurality of tested transformers or a single tested transformer, realizes the simultaneous calibration of multi-channel output signals of the direct current transformer, can solve the defects of the on-site multiple calibration of the direct current transformer, greatly saves the on-site calibration time of the direct current transformer, and improves the on-site calibration working efficiency.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the application can be implemented by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (5)
1. An in-situ wireless calibration apparatus for a dc transformer, the apparatus comprising:
a verification host, the verification host comprising:
the wireless synchronization receiving module receives and analyzes the Beidou synchronous signal and outputs the second pulse synchronous trigger signal and the time scale information of the current second pulse synchronous trigger signal;
the control module outputs a sampling control signal to the data sampling module at the rising edge of each pulse per second synchronous trigger signal sent by the wireless synchronization module, compares a sampling value sequence and time scale information of the standard mutual inductor with a sampling value sequence and time scale information of the tested mutual inductor, selects relative errors of the sampling value of the standard mutual inductor and the sampling value of the tested mutual inductor, which are the same as the sampling value sequence of the standard mutual inductor, and verifies the tested mutual inductor according to the relative errors;
the data sampling module receives the sampling control signal, samples the standard mutual inductor signal, stores the sampling value of the standard mutual inductor and the time scale information corresponding to the sampling value, and generates a sampling value sequence and time scale information of the standard mutual inductor;
the wireless transmission module receives a sampling value of the tested mutual inductor stored by the cloud server and time mark information corresponding to the sampling value, and generates a sampling value sequence and time mark information of the tested mutual inductor;
a checking slave, said checking slave comprising:
the wireless synchronization receiving module receives and analyzes the Beidou synchronous signal and outputs the second pulse synchronous trigger signal and the time scale information of the current second pulse synchronous trigger signal;
the control module outputs a sampling control signal to the data sampling module at the rising edge of each pulse per second synchronous trigger signal sent by the wireless synchronization module;
the data sampling module receives the sampling control signal, samples the signal of the tested mutual inductor and stores the sampling value of the tested mutual inductor and the time scale information corresponding to the sampling value;
and the wireless transmission module uploads the sampling value of the tested mutual inductor collected by the data collection module and the time scale information corresponding to the sampling value to the cloud server.
2. The device of claim 1, wherein the checking master and the checking slave have the same structure, the checking master comprises 1 and the checking slave comprises a plurality of checking slaves.
3. The device of claim 1, wherein the wireless synchronization module has a Beidou time service signal input interface, a pulse per second signal output interface and a serial port output interface.
4. The apparatus of claim 1, the data acquisition module having a dc voltage measurement interface, a pulse-per-second trigger sampling interface, and a data transmission interface, communicating with the control module via IEEE488.2 standard protocol, USB transmission protocol, and TCP/IP ethernet protocol.
5. An on-site wireless calibration method for a direct current transformer, the method comprising:
receiving and analyzing the Beidou synchronous signal, and outputting the second pulse synchronous trigger signal and the time scale information of the current second pulse synchronous trigger signal;
outputting a sampling control signal at the rising edge of each pulse per second synchronous trigger signal;
sampling a standard transformer signal and a measured transformer signal according to a control signal, storing a sampling value of the standard transformer and time scale information corresponding to the sampling value, generating a sampling value sequence and time scale information of the standard transformer, storing the sampling value of the measured transformer and the time scale information corresponding to the sampling value, and generating the sampling value sequence and the time scale information of the measured transformer;
comparing the time scale information corresponding to the sampling value of the standard mutual inductor with the time scale information corresponding to the sampling value of the tested mutual inductor;
selecting a sampling value of a standard mutual inductor with the same time scale information as the measured mutual inductor and a sampling value of the measured mutual inductor, calculating the relative error between the sampling value of the standard mutual inductor and the sampling value of the measured mutual inductor when the time scale information is the same, and carrying out error check on the measured mutual inductor according to the relative error.
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| CN117388785A (en) * | 2023-12-12 | 2024-01-12 | 武汉格蓝若智能技术股份有限公司 | Calibration method and system for voltage acquisition device |
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