CN204694753U - A kind of high-precision transmission line of electricity electric current on-Line Monitor Device - Google Patents

Abstract

The utility model discloses a high-precision on-line monitoring device for transmission line current. It is connected with the input terminal of the induction power-taking module, the measuring transformer is connected with one end of the current measurement module, the output terminal of the induction power-taking module is respectively connected with one end of the current measurement module, the main control unit, and the GPRS communication module, and the other end of the current measurement module One end is connected to the main control unit. The GPRS communication module is connected with the main control unit. The current measurement module is used to collect current signals, and the main control unit is used to sample and calculate the current signals transmitted by the current measurement module, obtain the primary current value, and communicate with the GPRS communication module to obtain current time and address information. The device of the utility model has the advantages of reasonable structure, stable and reliable safety and accurate prediction.

Description

A high-precision on-line monitoring device for transmission line current

technical field

The utility model belongs to the field of current monitoring of transmission lines, in particular to a high-precision on-line monitoring device for current of transmission lines.

Background technique

    In the composition of the power system, the high-voltage transmission line is an important link. It plays a key role in the power transmission part of the power system. However, because most of the high-voltage transmission lines are distributed outdoors, even in relatively remote places, there are some inherent disadvantages in using manual inspection to monitor high-voltage transmission lines: such as large workload, susceptible to personal subjective factors impact, it is difficult to guarantee the comprehensiveness and accuracy of the measurement results, etc. The on-line monitoring system of high-voltage transmission lines can just overcome these shortcomings, so the research on the on-line monitoring system of high-voltage transmission lines has great application prospects and practical value, and the monitoring of on-line current is the most important part of it. At present, there are many devices on the market for current monitoring of transmission lines, but these devices not only consume high power, but also have low precision.

Utility model content

The utility model aims at the problem of low accuracy of the existing transmission line current monitoring device, and provides a high-precision transmission line current on-line monitoring device which can effectively solve the above problems. The device improves the test accuracy of the transmission line current on-line monitoring.

The technical solution adopted by the utility model to solve the technical problem is: to provide a high-precision transmission line current online monitoring device, which includes a measuring transformer, an energy transformer, an induction power taking module, a current measuring module, a main control unit, GPRS communication module, the energy transformer is connected to the input end of the induction power acquisition module, the measurement transformer is connected to one end of the current measurement module, and the output end of the induction power acquisition module is respectively connected to one end of the current measurement module, the main control unit, GPRS communication module connection, the other end of the current measurement module is connected to the main control unit; the GPRS communication module is connected to the main control unit; the induction power-taking module is used for power supply It is used to collect current signals; the main control unit is used to sample and calculate the current signal transmitted by the current measurement module, obtain the primary current value, and communicate with the GPRS communication module to obtain current time and address information; the GPRS communication module is used to transfer the main control The data of the unit is transmitted to the background system or hand-held inspection instrument through the GSM network.

According to the above technical solution, the current measurement module includes a filter circuit, a power chip, and an MCU. The output end of the measurement transformer is connected to one end of the filter circuit, the other end of the filter circuit is connected to one end of the power chip, and the other end of the power chip is connected to the MCU. .

The utility model has the following beneficial effects: the utility model supplies power to the current measurement module, the main control unit and the GPRS communication module through the induction power-taking module, the current measurement module collects the current signal, and the main control unit samples the current signal transmitted by the current measurement module And calculation, obtain the primary current value, and communicate with the GPRS communication module to obtain the current time and address information, and then transmit the data of the main control unit to the background system or hand-held inspection instrument through the GPRS communication module through the GSM network, when the background system or When the hand-held inspection instrument finds that the monitored current value is unreasonable, the monitoring personnel can deal with it in time according to the location of the fault point. The device of the utility model has the advantages of reasonable structure, stable and reliable safety and accurate prediction.

Description of drawings

The utility model will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is a schematic structural view of a transmission line current online monitoring device according to an embodiment of the present invention;

Figure 2 is a schematic diagram of the working principle of the current measurement module;

Fig. 3 is a working principle diagram of the transmission line current online monitoring device according to the embodiment of the utility model.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

In the embodiment of the utility model, a high-precision transmission line current online monitoring device is provided, as shown in Figure 1, the device includes a measuring transformer, an energy transformer, an induction power taking module, a current measuring module, and a main control unit , GPRS communication module, the energy transformer is connected to the input end of the induction power acquisition module, the measurement transformer is connected to one end of the current measurement module, and the output end of the induction power acquisition module is respectively connected to one end of the current measurement module, the main control unit, and the GPRS The communication module is connected, and the other end of the current measurement module is connected with the main control unit; the GPRS communication module is connected with the main control unit; the induction power-taking module is used to supply power for the current measurement module, the main control unit, and the GPRS communication module; the current measurement module is used for Collect current signals; the main control unit is used to sample and calculate the current signal transmitted by the current measurement module, obtain the primary current value, and communicate with the GPRS communication module to obtain current time and address information; the GPRS communication module is used to connect the main control unit The data is transmitted to the background system or handheld inspection instrument through the GSM network.

Among them, the current measurement module includes a filter circuit, a power chip, and an MCU. The output end of the measurement transformer is connected to one end of the filter circuit, the other end of the filter circuit is connected to one end of the power chip, and the other end of the power chip is connected to the MCU, as shown in the figure 2 shown.

The inductive power-taking module is designed to store energy during the idle time between measurements to ensure that there is enough energy for a current measurement and data transmission even when the primary side current is small.

The main control unit uses a high-performance processor to sample and calculate the current signal transmitted by the current measurement module, obtain the primary current value, and communicate with the GPRS communication module to obtain current time and address information. Among them, the current measurement module part is mainly composed of a measurement transformer, a filter circuit, a power chip, and an MCU. As shown in Figure 3, the large current on the primary side is transformed into a smaller current on the secondary side through a high-precision measuring transformer. Since the power chip and the single-chip microcomputer can only handle the current of the milliampere level, a high The precision sampling circuit converts the secondary side current into a current that the power chip can handle. The power chip needs to be calibrated before use. In order to improve the accuracy, the calibration instrument we use has an accuracy of 0.1%. Then, the MCU reads the current value from the power chip, performs relevant data processing, and finally obtains a current value with an accuracy of up to 0.1%. The main control unit also has a power management function. During the measurement interval, it can cut off the power supply of other modules such as the GPRS communication module and enter the sleep mode. Only when the current measurement time comes, it will resume the normal working mode, complete the current measurement, and start the GPRS module to transmit data, and then enter Sleep mode again to reduce power consumption.

The utility model mainly obtains the real-time current on the transmission wire by designing a high-precision (measurement error less than 0.1%) low-power current measurement integrated circuit, and then communicates through GPRS. The function of the power-taking device is to provide +5V voltage to the main control unit, and the function of the GPRS communication module is to transmit the measured data to the background system or the hand-held inspection instrument through the GSM network. When the current value monitored by the background or hand-held inspection instrument is unreasonable, the monitoring personnel can carry out relevant processing according to the location of the fault point in time. The device is advanced in design, reasonable in structure, safe, stable and reliable, and accurate in forecasting. It is an ideal current monitoring device for transmission lines.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present utility model.

Claims (2)

1. A high-precision transmission line current online monitoring device is characterized in that the device includes a measuring transformer, an energy harvesting transformer, an induction power fetching module, a current measurement module, a main control unit, a GPRS communication module, and an energy harvesting mutual inductor The sensor is connected to the input end of the induction power-taking module, the measuring transformer is connected to one end of the current measurement module, the output end of the induction power-taking module is respectively connected to one end of the current measurement module, the main control unit, and the GPRS communication module, and the current measurement module The other end is connected to the main control unit; the GPRS communication module is connected to the main control unit; the induction power-taking module is used to supply power for the current measurement module, the main control unit, and the GPRS communication module; the current measurement module is used to collect current signals; It is used to sample and calculate the current signal transmitted by the current measurement module, obtain the primary current value, and communicate with the GPRS communication module to obtain the current time and address information; the GPRS communication module is used to transmit the data of the main control unit to the background through the GSM network System or hand-held inspection instrument. 2. The high-precision transmission line current on-line monitoring device according to claim 1, wherein the current measurement module includes a filter circuit, a power chip, and an MCU, and the output terminal of the measurement transformer is connected with an end of the filter circuit, and the filter circuit The other end of the power chip is connected to one end of the power chip, and the other end of the power chip is connected to the MCU.