CN203658326U - An SF6 gas micro-water and density online monitoring device - Google Patents

Abstract

The utility model discloses an on-line monitoring device for micro-water and density of SF ₆ gas, which comprises a plurality of micro-water and density transmitters for accurately measuring the pressure value, temperature value and relative humidity value in a gas chamber, and is used for detecting SF ₆ The centralized monitoring host of gas indicators is used for the workstation processor to display the SF ₆ gas density, micro-water content and real-time temperature data in real time at the terminal. The micro-water and density transmitters are connected to the centralized monitoring host through RS-485/CAN bus , the centralized monitoring host is connected to the workstation processor through network communication. The utility model uploads the detected data to the centralized monitoring host through the communication bus, and then connects the centralized monitoring host to the workstation processing machine through the network, so that the staff can remotely or locally access and view the real-time data in the form of a webpage, and can according to Alarm prompt needs, set the predetermined alarm parameters and so on.

Description

An SF6 gas micro-water and density online monitoring device

technical field

The utility model relates to the field of environmental protection monitoring, in particular to an on-line monitoring device for SF ₆ gas micro water and density.

Background technique

With the rapid development of China's power industry, SF ₆ technology has been widely used in the field of smart grid construction. Due to its inherent characteristics, SF ₆ gas is currently an ideal insulation and arc extinguishing medium. However, because SF ₆ fresh air contains a certain amount of water, due to the omissions in the process of equipment installation, dismantling and maintenance, inflation, and air replenishment, there is water in the air chamber and pipe valve, and there are mistakes in the processing of switch workpieces and the above operations. As a result, the seal is not tight, and SF ₆ gas leaks outward. Because the external water pressure is much higher than the water pressure of the gas in the air chamber, the external moisture will reversely infiltrate into the air chamber, causing the water content of SF ₆ gas to increase while the density decreases. Under the action of high-temperature arc drawing, the decomposition product will chemically react with water to generate highly corrosive HF and H ₂ SO _3, etc., which will corrode and damage the insulating parts, and generate heat, which will lead to a dangerous increase in the gas pressure in the gas chamber. The durability strength and breaking capacity of the circuit breaker will decrease. In severe cases, the circuit breaker will explode, which will not only cause grid accidents, but also cause harmful gas and greenhouse gas emissions. Therefore, the micro-water content and gas density of SF ₆ will have a direct impact on the operation of equipment, the safety of personnel, and the stability of the power grid. How to strictly control the leakage and discharge of SF ₆ gas has become an important issue for environmental protection and safe operation of circuit breakers. major issues in the field. Whether the two physical indicators of humidity and density of SF ₆ gas are within the rated range determines whether the insulation and arc extinguishing performance of SF ₆ gas is effective or not.

At present, the monitoring of micro-water and density of SF ₆ gas generally adopts off-line measurement of micro-water content, which requires degassing and gas replenishment process, which is troublesome and unsafe to operate. At the same time, the toxic decomposition of SF ₆ gas in the SF ₆ gas equipment is harmful to operators. There is a great threat to health, and the recovery and emission of gas require a large investment in equipment, manpower and material resources.

Contents of the invention

The technical problem to be solved by the utility model is to provide a real-time and accurate SF ₆ online intelligent comprehensive monitoring system that can measure the micro-water and density of SF ₆ gas in order to ensure the normal operation of power equipment. .

For realizing above-mentioned object, the technical scheme that the utility model adopts is:

An SF ₆ gas micro-water and density online monitoring device, including multiple micro-water and density transmitters for accurately measuring the pressure value, temperature value and relative humidity value in the gas chamber, and used for centralized monitoring of SF ₆ gas indicators The host computer is used for the terminal to display the SF ₆ gas density, micro-water content and real-time temperature data in real time. The host computer and the workstation processor are connected through network communication.

Further, the centralized monitoring host uses Simple Network Management Protocol (SNMP) to communicate with the workstation processor.

Further, the micro-water and density transmitters include pressure sensors, temperature sensors, dew point sensors, signal processing circuits, A/D sampling circuits, microcontrollers and communication interface circuits, and the pressure sensors, temperature sensors and humidity sensors The output terminals of the signal processing circuit are respectively connected to the input terminals of the signal processing circuit, the output terminals of the signal processing circuit are connected to the input terminals of the A/D sampling circuit, and the input terminals and the output terminals of the microcontroller are respectively connected to the output terminals of the A/D sampling circuit and communicate with each other. The input terminals of the interface circuit are connected.

Further, the communication interface circuit includes an RS-485 bus interface circuit and a CAN bus interface circuit, and the input ends of the RS-485 bus interface circuit and the CAN bus interface circuit are connected to the output end of the microcontroller.

Further, the micro-water and density transmitters also include local locking output devices, digital display screens and alarm lights.

Further, the centralized monitoring host includes a liquid crystal display module for displaying monitoring data, a monitor for uploading an alarm or locking signal to a workstation processor according to a set threshold, and an alarm and locking execution device.

Compared with the prior art, the utility model has the following advantages: by uploading the detected data to the centralized monitoring host through the communication bus, the centralized monitoring host is then connected to the workstation processing machine through the network, so that the staff can realize remote or local webpage Access and view real-time data in the form, and set predetermined alarm parameters according to the needs of alarm prompts. At the same time, information can be retrieved, modified, and faults can be found at any node on the network, and fault diagnosis, capacity planning, and report generation can be completed.

Description of drawings

Accompanying drawing 1 is the system structural diagram of the utility model embodiment.

Accompanying drawing 2 is the structure schematic diagram of micro-water and density transmitter of the utility model embodiment.

Detailed ways

Specific embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

In this embodiment, a SF ₆ gas micro-water and density on-line monitoring device includes a plurality of micro-water and density transmitters 1 for accurately measuring the pressure value, temperature value and relative humidity value in the gas chamber, for detecting Centralized monitoring host 2 of SF ₆ gas index, workstation processor 3 for real-time display of SF ₆ gas density, micro-water content and real-time temperature data on the terminal, said micro-water, density transmitter 1 and centralized monitoring host 2 through RS -485/CAN bus connected, the centralized monitoring host 2 is connected with the workstation processor 3 through network communication, by visiting the WEB page, the data such as SF ₆ gas density, micro-water content and real-time temperature can be observed in real time, and can be prompted according to the needs of the alarm , set predetermined alarm parameters, etc.

Wherein, the centralized monitoring host 2 uses Simple Network Management Protocol (SNMP) to communicate with the workstation processor 3, which can realize remote or local access and viewing of real-time data in the form of webpages, and the network administrator can retrieve information at any node on the network, Make modifications, troubleshoot, and complete troubleshooting, capacity planning, and report generation.

Wherein, the micro-water and density transmitter 1 includes a pressure sensor 13, a temperature sensor 12, a dew point sensor 11, a signal processing circuit 14, an A/D sampling circuit 15, a microcontroller 16 and a communication interface circuit, and the pressure sensor 13. The output ends of the temperature sensor 13 and the humidity sensor 11 are respectively connected to the input end of the signal processing circuit 14, the output end of the signal processing circuit 14 is connected to the input end of the A/D sampling circuit 15, and the input end of the microcontroller 16 is connected to the input end of the A/D sampling circuit 15. The output end is respectively connected with the output end of the A/D sampling circuit 15 and the input end of the communication interface circuit. The communication interface circuit includes an RS-485 bus interface circuit 18 and a CAN bus interface circuit 17, and the input ends of the RS-485 bus interface circuit 18 and the CAN bus interface circuit 17 are connected to the output end of the microcontroller 16. The signal processing circuit 14 and the A/D sampling circuit 15 shape the signals of the dew point sensor 11, the pressure sensor 13 and the temperature sensor 12, process the data through the microcontroller 16, and upload the data to the on-site centralized monitoring host 2 through the RS485/CAN bus . When the measured SF ₆ gas index exceeds the standard, the monitor will automatically upload the alarm or blocking signal to the remote workstation processor 3 according to the preset threshold, or directly start the alarm and blocking device.

Wherein, the micro-water and density transmitter 1 also includes a local locking output device, a digital display and an alarm light. The centralized monitoring host 2 includes a liquid crystal display module for displaying monitoring data, a monitor for uploading an alarm or locking signal to a workstation processor according to a set threshold, and an alarm and locking execution device.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present utility model still belong to The scope of protection of the technical solution of the utility model.

Claims (4)

1. a SF ₆the micro-water of gas and density on-Line Monitor Device, is characterized in that, comprises multiple micro-water, density transmitter for accurately measuring air chamber internal pressure value, temperature value and rh value, for detection of SF ₆the Centralized Monitoring main frame of gas index, shows SF in real time for terminal ₆gas density, the workstation processor of micro-water content and real time temperature data, described micro-water, density transmitter is connected by RS-485/CAN bus with Centralized Monitoring main frame, described Centralized Monitoring main frame is connected by network service with workstation processor, described micro-water, density transmitter comprises pressure transducer, temperature sensor, dew point transducer, signal processing circuit, A/D sample circuit, microcontroller and communication interface circuit, described pressure transducer, the output terminal of temperature sensor and dew point transducer is connected with signal processing circuit input end respectively, described signal processing circuit output terminal is connected with A/D sample circuit input end, described microcontroller input end is connected with communication interface circuit input end with A/D sample circuit output terminal respectively with output terminal.

2. the micro-water of SF6 gas according to claim 1 and density on-Line Monitor Device, it is characterized in that, described communication interface circuit comprises RS-485 bus interface circuit and CAN bus interface circuit, and described RS-485 bus interface circuit is connected with microcontroller output terminal with CAN bus interface circuit input end.

3. the micro-water of SF6 gas according to claim 2 and density on-Line Monitor Device, is characterized in that, described micro-water, density transmitter also comprise and carry local locking output unit, digital display screen and alarm lamp.

4. the micro-water of SF6 gas and the density on-Line Monitor Device described in arbitrary according to claim 1-3, it is characterized in that, described Centralized Monitoring main frame comprise LCD MODULE for showing Monitoring Data, by the thresholding of setting upload report to the police or block signal to monitor and the warning locking actuating unit of workstation processor.

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