CN104776824A - Monitoring method and monitoring device for radial displacement of GIL (gas insulated transmission line) - Google Patents

Abstract

The invention discloses a GIL radial displacement monitoring method and a monitoring device. The monitoring device includes an angle measurement module fixedly installed on the GIL cylinder and used to measure the angle between the cylinder and the horizontal plane. The signal output end of the angle measurement module is connected to the The signal input end of the control module is connected, and the control module is used to convert the measured angle signal into a radial displacement signal and output it. The monitoring method is to measure the angle, convert the angle into the actual deformation of the busbar according to the relevant calculation, and monitor it in real time through the display screen. The data.

Description

A GIL radial displacement monitoring method and monitoring device

technical field

The invention belongs to the field of high-voltage switchgear and high-voltage electrical appliance manufacturing, and is mainly used for monitoring the radial deformation of closed transmission lines, especially for GIL, and specifically relates to a GIL radial displacement monitoring device and a monitoring method.

Background technique

Due to the many advantages of GIS, GIS equipment manufacturing and related technologies are developing rapidly, and gas insulated transmission lines (GIL) are getting more and more attention. Due to its high reliability, large transmission capacity and low power loss, GIL has gradually been widely used.

Because the gas-insulated transmission line is very long, it is generally divided into multiple inflatable units during design, and each inflatable unit is composed of multiple manufacturing units, and each is equipped with expansion joints (bellows). It is guaranteed that it can only move axially during normal operation without radial displacement due to force. However, because GIL is affected by ambient temperature changes, processing and installation errors, foundation settlement, and earthquakes, axial and lateral displacements often occur. In order to monitor the deformation of GIL caused by various factors such as temperature difference and installation of the busbar, improve the safe operation of GIL For reliability, it is necessary to measure the axial and lateral displacements. However, the axial displacement and deformation are generally easy to see intuitively, but the radial displacement is not easy to see intuitively. Therefore, most of them currently use radial displacement monitoring devices installed in appropriate positions.

At present, the existing GIL includes a relatively simple radial displacement monitoring device for the bus in the GIS string. Usually, a pointer perpendicular to the ground is set, and then the radial deformation of the bus is observed corresponding to the scale on the bus. This device can observe large displacement deformation to a certain extent. However, this method has certain limitations. First, the pointer itself is susceptible to bending due to external factors, thereby affecting the accuracy of measurement. In addition, the device cannot monitor the deformation of the busbar in real time, and more power stations need to be monitored. , There are also many measuring devices, which brings a huge workload to the inspection staff.

Contents of the invention

The purpose of the present invention is to provide a GIL radial displacement monitoring method to ensure the accuracy of GIL radial displacement measurement, and to provide a monitoring device using the monitoring device.

In order to achieve the above objectives, the technical solution adopted in the present invention is: a GIL radial displacement monitoring method, which measures the angle between the cylinder and the horizontal plane, and calculates the radial displacement of the cylinder according to the angle and the length of the cylinder.

The radial displacement of the cylinder is calculated according to the functional relationship of the triangle formed by the cylinder, the horizontal plane and the radial displacement of the cylinder.

The measuring device for measuring the angle between the cylinder body and the horizontal plane is arranged at the upper horizontal position of the connecting flange between the cylinder body and the bellows.

Divide the radial deformation that the GIL can withstand into the numerical ranges corresponding to safety, early warning and danger, and set corresponding operating status indicators on the measuring device to judge the range of the calculated radial displacement of the measuring point, and click Light up the corresponding indicator light.

The present invention also provides a GIL radial displacement monitoring device, including an angle measurement module fixedly installed on the GIL cylinder for measuring the angle between the cylinder and the horizontal plane, the signal output terminal of the angle measurement module and the signal of the control module The input end is connected, and the control module is used to convert the measured angle signal into a radial displacement signal and output it.

The device also includes an angle change display screen connected with the control module for displaying angle signals and a radial deformation display screen for displaying radial displacement signals.

The device also includes a GIL running state indicator light for indicating according to the value range of the radial displacement signal.

The device is encapsulated by a housing.

The GIL radial displacement monitoring method and monitoring device of the present invention convert the angle into the actual deformation of the busbar according to the relevant calculation through the measurement of the angle, and monitor it in real time through the display screen. The method and the device can monitor the radial deformation of the busbar in real time Numerical value, which provides accurate data for analyzing the operation status of GIL.

In addition, the device has a GIL deformation operation status indicator light, and inspection personnel can judge the deformation of GIL according to the color of the indicator light, which can greatly reduce the workload of inspection personnel.

The monitoring device is packaged in a housing, free from external factors, easy to install, and beautiful in appearance.

Description of drawings

Figure 1 is a schematic diagram of the ideal installation and operation of the GIL busbar;

Figure 2 is a schematic diagram of the actual installation and operation of the GIL busbar;

Figure 3 is a schematic diagram of the installation structure of the GIL radial displacement monitoring device;

Figure 4 is a schematic diagram of the appearance and structure of the GIL radial displacement monitoring device;

Figure 5 is a schematic structural diagram of the GIL radial displacement monitoring device;

Fig. 6 is a flow chart of signal transmission of the GIL radial displacement monitoring device.

Detailed ways

The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, it is the ideal state in the installation and operation of the busbar, that is, no radial displacement occurs, but in practice, due to the existence of installation errors, equipment processing and manufacturing errors, and the impact of a series of external forces on the cylinder, corresponding radial displacement.

As shown in Figure 2, the possible deformations during the operation of the GIL will result in corresponding angular and radial displacements. The GIL radial displacement monitoring method of the present invention is to measure the angle β between the cylinder and the horizontal plane, and then according to the Calculate the radial displacement a of the cylinder from the angle and cylinder length L.

As shown in Figure 3, the measuring device 1 used to measure the angle between the cylinder body 3 and the horizontal plane in this embodiment is arranged at the upper horizontal position of the connecting flange 7 between the cylinder body and the bellows 2. During calculation, according to the cylinder body, The horizontal plane and the radial displacement of the cylinder form a triangular functional relationship to calculate the radial displacement of the cylinder, that is, a=L*tgβ, where L is the horizontal distance between the installation point of the measuring device and the fixed support 4 of the GIL.

In addition, the present invention divides the radial deformation that the GIL can withstand into numerical ranges corresponding to safety, early warning, and danger through calculation and analysis, and associates the numerical range with the corresponding indicator light of the operating state set on the measuring device, and then judges The range where the radial displacement of the measuring point obtained by calculating the angle value is located will light up the corresponding indicator light.

As shown in Figures 4 to 5, the present invention also provides a GIL radial displacement monitoring device. As can be seen from the figure, the device includes an angle measurement module fixedly installed on the GIL cylinder for measuring the angle between the cylinder and the horizontal plane , the signal output end of the angle measurement module is connected to the signal input end of the control module, and the control module is used to convert the measured angle signal into a radial displacement signal and output it.

In addition, for the convenience of observation and use, the device also includes an angle change display screen 91 connected to the control module for displaying the angle signal and a radial deformation display screen 92 for displaying the radial displacement signal, as well as a display screen 92 for displaying the radial displacement signal. The GIL running state indicator light indicating the numerical range in which it is located includes a normal working indicator light 81 , an early warning indicator light 82 and a danger indicator light 83 ; it also includes an operation button 10 such as reset.

The device is packaged together with corresponding functional modules above a shell, and installed at a fixed position on the GIL, which can avoid the influence of external factors on the monitoring, and has the double insurance function of real-time data monitoring and signal indication.

As shown in Figure 6, the working principle and process of the monitoring device of the present invention are as follows: the GIL displacement monitoring device is installed at a fixed position of the GIL, and after calibration, the display screens 91 and 92 respectively display the angle between the busbar and the horizontal line and the deformation of the busbar in the radial direction amount, and now the normal working indicator light 81 is on. With the influence of external temperature rise and foundation settlement, its radial deformation will change, and the angle measurement module transmits the angle signal to the angle change display screen 91 for display, and the data of the display screen 2 is passed through the control module 3 by writing a corresponding program Converted into actual GIL radial deformation data, its value will be displayed on the display screen 92 in real time. Simultaneously set control module 3 according to the vertical range of radial deformation of setting security, early warning and danger, if GIL radial deformation increases to early warning range during operation, then normal working indicator light 81 goes out, early warning light 82 On; when serious radial deformation occurs, the danger indicator light 83 is on. At this time, the deformation of the GIL has exceeded the safe radial deformation range of the original design of the GIL. Take corresponding measures according to the actual situation, so as to ensure the safe and reliable operation of the GIL .

The above embodiments are only used to help understand the core idea of the present invention, and cannot limit the present invention with this. For those skilled in the art, any modification or equivalent replacement of the present invention based on the idea of the present invention, in the specific implementation mode and application scope Any changes made above should be included within the protection scope of the present invention.

Claims (8)

1. A GIL radial displacement monitoring method is characterized in that: measure the angle of cylinder and horizontal plane, calculate the radial displacement of cylinder according to this angle and cylinder length. 2. The GIL radial displacement monitoring method according to claim 1, characterized in that: the radial displacement of the cylinder is calculated according to the functional relationship of the triangle formed by the cylinder, the horizontal plane and the radial displacement of the cylinder. 3. The GIL radial displacement monitoring method according to claim 1 or 2, characterized in that: the measuring device for measuring the angle between the cylinder and the horizontal plane is arranged at the horizontal position above the connecting flange between the cylinder and the bellows . 4. The GIL radial displacement monitoring method according to claim 3, characterized in that: the radial deformation that the GIL can bear is divided into numerical ranges corresponding to safety, early warning and danger and corresponding operating states are set on the measuring device The indicator light judges the range of the calculated radial displacement of the measuring point and lights up the corresponding indicator light. 5. A GIL radial displacement monitoring device is characterized in that: comprise the angle measurement module that is fixedly installed on the GIL cylinder, is used to measure cylinder and horizontal plane angle, the signal output terminal of described angle measurement module and the control module The signal input terminal is connected, and the control module is used to convert the measured angle signal into a radial displacement signal and output it. 6. The GIL radial displacement monitoring device according to claim 5, characterized in that: the device also includes an angle change display screen connected to the control module for displaying angle signals and a radial deformation display for displaying radial displacement signals Screen. 7. The GIL radial displacement monitoring device according to claim 6, characterized in that the device further comprises a GIL operating status indicator light for indicating according to the numerical range of the radial displacement signal. 8. The GIL radial displacement monitoring device according to claim 5, characterized in that: the device is packaged by a housing.