CN207882350U - A kind of total electric field measuring system - Google Patents

Abstract

The utility model provides a synthetic electric field measurement system, comprising: at least one electric field sensor for detecting the electric field intensity to be measured and outputting an analog voltage signal; a data acquisition unit for converting the analog voltage signal into a first digital signal , and send it to the optical fiber data transmission unit; the optical fiber data transmission unit is used to convert the first digital signal into an optical pulse, and send it to the optical fiber data receiving unit through the optical fiber; the optical fiber data receiving unit is used to The light pulse is converted into a second digital signal, and the second digital signal is sent to the upper computer; the power supply unit. In the technical solution provided by the utility model, the optical fiber line is used for data transmission, so that the transmission line has strong anti-interference ability and large transmission effective distance, which can meet the requirements of long-distance measurement and reduce errors or mistakes in the data transmission process. It is especially suitable for electric field measurement in high voltage environment and realizes high and low voltage isolation.

Description

A Synthetic Electric Field Measurement System

technical field

The utility model relates to the technical field of electric power measurement systems, in particular to a synthetic electric field measurement system.

Background technique

With the rapid development of my country's economy, the demand for electricity in various industries continues to increase. my country's power generation energy and electricity demand are extremely unbalanced geographically. The State Grid Corporation of China has proposed a major strategic measure to accelerate the development of AC-DC UHV power grids based on my country's national conditions. UHV transmission can realize long-distance and large-capacity transmission of electric energy, which is suitable for the interconnection of large-scale power grids. With the construction of UHV transmission lines, the influence of its UHV electromagnetic environment on surrounding equipment and organisms has attracted more and more attention. Among them, the ground synthetic electric field strength is one of the important indicators to evaluate the electromagnetic environment interference under the UHVDC transmission line.

When the electric field strength on the surface of the DC transmission line conductor is greater than the initial corona electric field intensity, the air near the surface of the conductor will be ionized, and the space charge generated by the ionization will move along the direction of the electric force line. For bipolar DC transmission lines, the entire space can be roughly divided into three areas: the area between the positive wire and the ground is filled with positive ions; the area between the negative wire and the ground is filled with negative ions; the area between the positive and negative wires has both positive and negative ions . These space charges will cause some effects unique to DC transmission lines: the space charge itself generates an electric field, which will greatly strengthen the electric field generated by the wire charge; the space charge moves under the action of the electric field to form an ionic current; When the ion current encounters an object that is insulated from the ground, it will attach to the object to form an electrification phenomenon, which may cause a transient electric shock. The space electric field under the DC transmission line is composed of two parts: one part is generated by the charges carried by the wires. This field is related to the geometric position of the wire arrangement and is proportional to the voltage of the wires. It is usually called the electrostatic field or the nominal electric field; the other A part is generated by space charge. The vector superposition of these two parts of the electric field is called the resultant electric field. The size of the synthetic electric field mainly depends on the severity of the corona discharge of the wire.

The Chinese patent with the publication number CN101188059A discloses a DC synthetic electric field measurement system, which includes a set of DC field strength meters connected to a signal acquisition and processing device through a signal cable, and an A/D conversion module is arranged in the acquisition and processing device. The network cable is bidirectionally connected to the control and signal display device. And, the Chinese patent with the publication number CN102928701A discloses a measurement system for measuring the distribution characteristics of the ion flow field under direct current transmission, including an electric field strength sensor, a meteorological parameter sensor and a multi-channel real-time synchronous control device, the direct current electric field The intensity sensor, the ion current collection sensor and the meteorological parameter sensor are evenly distributed on the measurement site, and the multi-channel real-time synchronous control device is respectively connected with the DC electric field intensity sensor, the ion current collection sensor and the meteorological parameter sensor, and receives the DC electric field intensity sensor, the ion current sensor and the meteorological parameter sensor in real time. The utility model has the advantages of realizing multi-parameter multi-channel real-time measurement and high measurement accuracy.

The above two patents have the following problems: they both use electrical communication to transmit data, and in the complex electromagnetic environment under the UHV line, the packet loss rate and bit error rate are relatively high. For the electrical communication system, considering the influence of the complex electromagnetic environment, wireless communication and wired electrical communication systems are susceptible to interference, and the distance from the experimental data back to the measurement room may be relatively long, so the electrical communication system is extremely prone to data failure. Error transmission, which makes the measurement results inaccurate or even wrong. In addition, the measurement circuit located in a complex electromagnetic environment can easily lead high-voltage electricity to the low-voltage measurement terminal, which may pose a safety threat to operators and equipment.

Utility model content

The technical problem to be solved by the utility model is to provide a synthetic electric field measurement system, which can reduce errors or mistakes in the data transmission process and realize isolation between high and low voltages at the same time.

In order to solve the above technical problems, the utility model provides a synthetic electric field measurement system, including:

At least one electric field sensor is used to detect the electric field strength to be measured and convert it into an analog voltage signal, and send it to the data acquisition unit;

A data acquisition unit, configured to convert the received analog voltage signal into a first digital signal, and send it to the optical fiber data transmission unit;

An optical fiber data transmission unit, configured to convert the received first digital signal into an optical pulse, and send it to the optical fiber data receiving unit through an optical fiber;

An optical fiber data receiving unit, configured to convert the received optical pulse into a second digital signal, and send the second digital signal to the host computer;

The power supply unit is used to supply power to the electric field sensor, the data acquisition unit and the optical fiber data transmission unit.

Further, the data acquisition unit includes an A/D conversion circuit and a communication module corresponding to the electric field sensors one by one, the A/D conversion circuit converts the analog voltage signal into a first digital signal, and the second A digital signal is transmitted to the optical fiber data transmission unit through the communication module.

Further, the electric field sensor is suspended and located at the high potential end.

Further, a mounting seat corresponding to the electric field sensors one-to-one is also included for placing the electric field sensors.

Further, the mounting seat is circular, the lower part of the electric field sensor is spherical, and the lower part of the electric field sensor is clamped in the inner ring of the mounting seat.

Further, the upper computer is composed of a measurement and control computer and upper computer software, and is used for analyzing, displaying and saving the second digital signal.

Further, the electric field sensor is used to intercept the synthetic field strength in the environment to be measured, and convert the obtained electric field signal into the analog voltage signal that can be collected by the data acquisition unit through the signal conditioning circuit inside the electric field sensor .

Further, the host computer software is used to calculate the electric field strength to be measured according to the configuration parameters of the electric field sensor stored therein and the second digital signal.

The synthetic electric field measurement system provided by the utility model uses optical fiber to transmit data, and has the following advantages:

1. The utility model combines the stable transmission characteristics of optical fiber communication technology, which can meet the real-time and reliable data transmission standards required by application fields such as transmission of UHV synthetic electric field data;

2. The utility model is especially suitable for electric field measurement in a high-voltage environment. It perfectly realizes the isolation of high-voltage side measurement and low-voltage side data storage and processing, and ensures the safety of low-voltage side equipment and personal safety to the greatest extent.

3. In the technical solution provided by the utility model, the optical fiber line is used for data transmission, so that the anti-interference ability of the transmission line is strong, and the effective distance of transmission is large, which can meet the requirements of long-distance measurement and reduce errors or mistakes in the process of data transmission;

4. The system of the present invention simplifies the hardware design of data acquisition, data transmission, etc., and reduces the production cost.

Description of drawings

Fig. 1 is the structural representation of the synthetic electric field measurement system of the present utility model;

Fig. 2 is a schematic diagram of the connection between the electric field sensing array and the data acquisition unit in the synthetic electric field measurement system of the present invention;

Fig. 3 is a structural schematic diagram of the suspension measurement of the electric field sensor in the synthetic electric field measurement system of the present invention;

Fig. 4 is a top view of the electric field sensor fixing assembly in the synthetic electric field measurement system of the present invention;

Fig. 5 is a functional diagram of the host computer software in the synthetic electric field measurement system of the present invention.

In the figure, 1. Bracket, 2. Electric field sensor, 3. Hook, 4. Mounting seat.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the utility model and implement it, but the examples given are not intended to limit the utility model.

A synthetic electric field measurement system, as shown in Figure 1 and Figure 2, includes:

The electric field sensing array includes at least one electric field sensor for detecting the electric field intensity to be measured and outputting an analog voltage signal. The electric field sensor intercepts the synthetic field strength in the environment to be measured, and converts the obtained electric field signal into an analog voltage signal that can be collected by the data acquisition unit through the signal conditioning circuit inside the electric field sensor. The electric field sensing array is composed of a plurality of electric field sensors, and the number and installation positions of the sensors can be flexibly selected according to actual measurement requirements. In this embodiment, in the actual corona cage measurement environment, a group of 5 sensors is used, and a single electric field sensor is arranged every 2 meters as shown in Figure 4, thereby completing the installation of the electric field sensing array . The relevant parameters of the electric field sensor are as follows: DC measurement range is -80～+80kV/m; AC measurement range is 0～30kV/m; measurement uncertainty is ±5%; operating/storage temperature is -10～+40℃; The humidity is 0% to 100%; the size is 90mm×90mm×90mm; the weight is 0.5kg; the power consumption is 0.5W;

a data acquisition unit, configured to convert the analog voltage signal into a first digital signal, and send it to the optical fiber data transmission unit;

An optical fiber data transmission unit, configured to convert the first digital signal into an optical pulse, and send it to the optical fiber data receiving unit through an optical fiber;

The optical fiber data receiving unit is used to convert the optical pulse into a second digital signal, and transmit the second digital signal to the host computer through the serial port to USB;

A power supply unit (not shown in the figure) is used to supply power to the electric field sensor, data acquisition unit and optical fiber data transmission unit.

The combined electric field measurement system adopts optical fiber communication, realizes the combination of optical fiber and electric field measurement, has strong anti-electromagnetic interference capability, and has a long transmission distance. Compared with wireless and other wired electrical communication methods, it has many advantages.

In an optional implementation manner of this embodiment, as shown in FIG. 2, the data acquisition unit includes an A/D conversion circuit and a communication module corresponding to the electric field sensor one by one, and the A/D conversion circuit converts the The analog voltage signal is converted into a first digital signal, and the first digital signal is transmitted to the optical fiber data transmission unit through the communication module. The data acquisition unit has a multi-channel synchronous acquisition function, and completes the data synchronous acquisition function of the electric field sensing array. The data acquisition unit multi-channel synchronously acquires the signals of the electric field sensing array, and the acquired data has a good time scale at the same time, which ensures the accuracy of the later data analysis results.

In an optional implementation manner of this embodiment, as shown in FIG. 3 , the electric field sensor 2 is suspended and located at the high potential end. Considering the special electric field measurement environment of the complex electromagnetic environment, the synthetic electric field measurement system designed should be suitable for the complex measurement environment. Therefore, the synthetic electric field measurement system adopts the suspension measurement method, which can reduce ground interference compared with the electric field sensor measurement on the ground The influence of the electric field improves the accuracy of the synthetic electric field measurement system.

In an optional implementation manner of this embodiment, as shown in FIG. 4 , mounting bases 4 corresponding to the electric field sensors 2 are also included for placing the electric field sensors 2 .

In an optional implementation of this embodiment, as shown in Figure 4, the mounting seat 4 is circular, the lower part of the electric field sensor is spherical, and the lower part of the electric field sensor is clamped on the mounting seat. In the inner ring, the mounting seat 4 is fixed on the bracket 1 through the hook 3 . The mounting seat 4 adopts a ring-shaped structure to replace the original three-claw base, and the three-claw base is more suitable for arranging sensors on the ground. Since the synthetic electric field measurement system adopts a suspension measurement method when measuring in a complex electromagnetic environment, The circular base structure can enable the sensor to better maintain an upright posture when it is suspended, and reduce the measurement error caused by the change of the sensor posture.

In an optional implementation manner of this embodiment, as shown in FIG. 5 , the host computer is composed of a measurement and control computer and host computer software, and completes sending and receiving, analyzing, displaying and saving data. The host computer software stores the configuration parameters of each electric field sensor in the electric field sensing array, and obtains the electric field intensity value measured by the sensor by calculating the analog voltage value obtained and the configuration parameters of the electric field sensor. The main functions of the upper computer are divided into two parts: sensor parameter management and data acquisition management. Sensor parameter management includes two parts: channel-sensor-position mapping and calibration coefficient input and loading. Among them, channel-sensor-position mapping realizes the one-to-one correspondence between acquisition module channels, sensor numbers and sensor measurement positions, so that the design can be flexibly adapted to actual measurement Problems that may occur in the sensor; the calibration coefficient input and loading function is mainly because when the electric field sensor is used for a period of time, the aging of the sensor components and the change in the resistance value will cause the sensor calibration coefficient to change. In order to ensure the accuracy of the collected data, It is necessary to obtain the calibration coefficient of the sensor before collecting data and update it in the program; data collection management mainly includes functions such as range, collection cycle setting, data collection storage, and data chart display. The data can be displayed in a variety of ways, including distributed data display in tabular form and distributed graphical display through histograms, allowing users to grasp the precise value of the electric field intensity corresponding to each position. The real-time storage of data requires that the program must be supported by a background database. After the data collection is completed, the user can analyze the offline database files.

The protection scope of the present utility model is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present utility model are all within the protection scope of the present utility model. The scope of protection of the utility model shall be determined by the claims.

Claims (7)

1. a kind of total electric field measuring system, which is characterized in that including：

At least one electric-field sensor for detecting electric-field strength to be measured and being converted to analog voltage signal, and sends it to number According to collecting unit；

Data acquisition unit for the analog voltage signal received to be converted to the first digital signal, and is sent to Unit is transmitted to fiber data；

Fiber data transmits unit, for first digital signal received to be converted to light pulse, and is passed through light Fibre is sent to fiber data receiving unit；

Fiber data receiving unit, for the light pulse received to be converted to the second digital signal, and by described second Digital signal is sent to host computer；

Power supply unit, for giving the transmission unit power supply of the electric-field sensor, data acquisition unit and fiber data.

2. total electric field measuring system as described in claim 1, which is characterized in that the data acquisition unit include with it is described The one-to-one A/D conversion circuits of electric-field sensor and communication module, the A/D conversion circuits turn the analog voltage signal It is changed to the first digital signal, first digital signal is transferred to the fiber data by the communication module and transmits unit.

3. total electric field measuring system as claimed in claim 1 or 2, which is characterized in that the electric-field sensor, data acquisition Unit, fiber data transmission unit and power supply unit are vacantly arranged, and are located at hot end.

4. total electric field measuring system as claimed in claim 3, which is characterized in that further include with the electric-field sensor one by one Corresponding mounting base, for placing the electric-field sensor.

5. total electric field measuring system as claimed in claim 4, which is characterized in that the mounting base is circular ring shape, the electricity Field sensor lower part is spheroidal, and the lower part of the electric-field sensor is arranged in the inner ring of the mounting base.

6. total electric field measuring system as claimed in claim 3, which is characterized in that the host computer is by Measurement ＆control computer and upper Position machine software sharing, for parsing, displaying and saving second digital signal.

7. total electric field measuring system as claimed in claim 3, which is characterized in that the electric-field sensor is to be measured for intercepting The formate field intensity in environment is measured, and obtained electric field signal is converted by the signal conditioning circuit inside the electric-field sensor For the collectable analog voltage signal of the data acquisition unit.