CN202033432U - Monitoring device used for lightning arrester - Google Patents

Abstract

The utility model relates to the field of on-site operation monitoring of lightning arresters, and discloses a monitoring device for lightning arresters, comprising a plurality of CT sensor units arranged on the side of the lightning arrester, and an intelligent monitoring unit IED connected to the CT sensor unit signal through a communication cable, intelligent monitoring The unit IED is connected to the station control layer through optical fiber, and the station control layer is connected to the real-time clock and the timing system of the upper computer. Through the intelligent monitoring device, real-time and uninterrupted monitoring of the leakage current and the number of actions of the arrester is carried out to reflect the performance of the arrester and the overvoltage limit situation. The operator can understand the operation of the arrester through the display in the control room, and realize the function of data remote transmission. At the same time, the device also has the function of providing a remote communication interface to the upper computer of the control center, so that the operating parameters of the arrester can enter the information system of the control center in real time.

Description

A monitoring device for a lightning arrester

technical field

The utility model relates to the field of lightning arresters, in particular to the field of on-site operation monitoring of lightning arresters.

Background technique

The arrester monitoring device is a device for online monitoring of the electrical performance of the arrester in the substation. The device reflects the performance of the arrester and the limit of the overvoltage through real-time and continuous monitoring of parameters such as the leakage current and the number of operations of the arrester.

The arrester is an important protective device in the power system, and its operating status can be judged by measuring the operating parameters of the arrester. As the power system puts forward high reliability requirements for equipment operation, it is necessary to monitor, record and judge the operating parameters of the arrester in real time, and the ordinary arrester monitor cannot meet this requirement for the operation monitoring of the arrester.

Utility model content

The purpose of this utility model is to provide a monitoring device for lightning arrester, which reflects the performance of lightning arrester and overvoltage limit situation through real-time and uninterrupted monitoring of leakage current, resistive current, capacitive current, number of actions and time of lightning arrester, Realized the function of data remote transmission.

In order to achieve the above object, the utility model has been realized by adopting the following technical solutions.

A monitoring device for a lightning arrester, characterized in that it includes a plurality of CT sensor units arranged on the side of the lightning arrester, and an intelligent monitoring unit IED connected to the CT sensor unit signal through a communication cable, and the intelligent monitoring unit IED communicates with the station control layer through an optical fiber connection, the station control layer transmits the monitoring data to the real-time clock and the upper computer timing system, and automatically records the operation time and times of the arrester.

Further features of the utility model are:

The intelligent monitoring unit IED is connected with 16-64 CT sensor units.

The plurality of CT sensor units corresponds to each lightning arrester under test.

The CT sensor unit and the intelligent monitoring unit IED transmit measurement signals and control signals through communication cables.

The communication cable adopts RS422 or RS485 mode.

The sensor CT adopts a single-turn core-through installation, and the grounding wire of the arrester directly passes through the sensor and is directly grounded without changing the grounding mode of the arrester. The primary side of the arrester under test is completely electrically isolated from the monitoring device. The monitoring system and the main system only have Magnetic link.

The utility model adopts a plurality of CT sensor units to be connected with an intelligent monitoring unit IED through a communication cable, and the intelligent monitoring unit IED is connected with a station control layer through an optical fiber for data transmission. Real-time and uninterrupted monitoring of parameters such as the leakage current and the number of actions of the arrester to reflect the performance of the arrester and the overvoltage limit situation. In this way, the system also has the function of providing a remote communication interface to the upper computer in the control center of the power department, so that the operating parameters of the arrester can enter the information system of the power supply department. The device can operate in various voltage levels of substations and power plants, ensuring Monitor, record, transmit and judge the operating parameters of the arrester in real time.

Description of drawings

Fig. 1 is a structural schematic diagram of a monitor for a lightning arrester of the present invention.

In the figure: 1. CT sensor unit; 2. Communication cable; 3. Intelligent monitoring unit IED; 4. Optical fiber.

Detailed ways

Referring to Fig. 1, the monitoring device for the lightning arrester includes a plurality of CT sensor units 1 arranged on the side of the lightning arrester, and an intelligent monitoring unit IED3 connected to the CT sensor unit 1 through a communication cable 2, and the intelligent monitoring unit IED3 communicates with the CT sensor unit 1 through an optical fiber 4. The station control layer is connected, and the station control layer is connected with the real-time clock and the upper computer timing system for data transmission.

The intelligent monitoring unit IED 3 of this device can connect 16 to 64 CT sensor units 1, and multiple CT sensor units 1 correspond to each lightning arrester under test.

The CT sensor unit 1 and the intelligent monitoring unit IED3 transmit measurement signals and control signals through the communication cable 2, and the communication cable 2 adopts RS422 or RS485 mode.

The CT sensor unit 1 of this device is connected to the lightning arrester under test with a single-turn core-through connection, and the grounding wire of the arrester passes directly through the sensor and is directly grounded without changing the grounding mode of the arrester. The primary side of the arrester under test is completely electrically isolated from the monitoring device. , the monitoring system and the main system have only a magnetic connection.

In the monitoring device for lightning arresters of the present invention, the CT sensor unit 1 transmits the signals such as the leakage current of the lightning arrester transmitted from the field to the intelligent monitoring unit IED 3 through the communication cable 2, and is collected by the CPU in a unified manner, and the full current signal of the leakage current is directly solved. The resistive component is obtained based on the analysis and calculation of the waveform of the full current, so as to realize the monitoring of the full current, resistive current and capacitive current of the arrester; the number of actions of the arrester is recorded by the detection device of the sensor and sent to the In the intelligent monitoring unit IED 3, the CPU judges the operation status of the arrester after completing the signal collection, and stores the measurement results in the memory of the intelligent monitoring unit IED 3, and at the same time sends the measurement results to the upper monitoring machine through the optical fiber 4, and It is displayed on the display screen of the upper computer through the management software.

The monitoring device for lightning arrester analyzes, stores and uploads the current data and action times through the intelligent monitoring unit IED 3, and the user terminal displays and checks the historical data. The arrester operating parameters monitored by the monitoring device include the full current of the arrester's leakage current, its resistive current, capacitive current, number of operations, and time. The arrester monitoring device is equipped with a real-time clock and a host computer timing system, which can automatically record the operation time and times of the arrester.

Claims (6)

1. lightning arrester monitoring device, it is characterized in that, comprise a plurality of CT sensor units (1) that are arranged on the lightning arrester side, and the intellectual monitoring unit IED (3) that is connected with this CT sensor unit (1) signal by communication cable (2), intellectual monitoring unit IED (3) is connected with station level by optical fiber (4), and station level is connected with the host computer timing system with real-time clock.

2. a kind of lightning arrester monitoring device according to claim 1 is characterized in that, described intellectual monitoring unit IED (3) connects 16～64 CT sensor units (1).

3. a kind of lightning arrester monitoring device according to claim 1 is characterized in that described a plurality of CT sensor units (1) are corresponding to each tested lightning arrester.

4. a kind of lightning arrester monitoring device according to claim 1 is characterized in that, described CT sensor unit (1) passes through communication cable (2) transmission measurement signal and control signal with intellectual monitoring unit IED (3).

5. a kind of lightning arrester monitoring device according to claim 1 is characterized in that, described CT sensor unit (1) adopts single turn core type to be connected with tested lightning arrester, and the arrester ground line passes directly ground connection of CT sensor unit (1).

6. a kind of lightning arrester monitoring device according to claim 1 is characterized in that, described communication cable (2) adopts RS422 or RS485 pattern.

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