CN202008455U

CN202008455U - Circular flow measurement type on-line monitoring transmitter for SF6 micro-water and density

Info

Publication number: CN202008455U
Application number: CN2010205398012U
Authority: CN
Inventors: 申子文
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-09-25
Filing date: 2010-09-25
Publication date: 2011-10-12
Anticipated expiration: 2020-09-25

Abstract

The utility model is named as a circular flow measurement type on-line monitoring transmitter for SF6 micro-water and density. The transmitter is applied to the measurement of micro-water concentration of SF6 gas and SF6 gas density in high voltage switches in an electric power plant and a power grid transmission and transformation GIS (geographic information system) system. The transmitter adopts the technical scheme that a section of gas passage device is formed by a transmitter interface (1), a flange (2), gas power part (3), a humidity sensor (8), a transmitter body (4), an air guide tube (5) and a valve (20).The transmitter interface (1) and the valve (20) are communicated with a sulfur hexafluoride container; the gas power part (3) blows the sulfur hexafluoride gas to a probe of a micro-water sensor so as to be measured; and the transmitter solves the problem that the original electronic sulfur hexafluoride micro-water density sensor cannot accurately measure the actual micro-water value of the sulfur hexafluoride in the container due to the absorption of internal parts and moisture penetration and diffusion at joints.

Description

Circulate measurement formula SF 6Little water, density on-line monitoring transmitter

Technical field:

This product is applied to SF in power plant and the electrical network power transmission and transformation generalized information system mesohigh switch ₆Gas micro-water content and SF ₆The measurement of gas density.

Background technology:

The applied technology in current above-mentioned field mainly contains two kinds: 1, directly measure demonstration SF with on-the-spot mechanical pointer formula densitometer ₆Density.Gas in the high-voltage switch gear is discharged a part and its micro-water content is measured with the artificial pointwise of portable micro-water tester, it is accurate to be characterized in that little water sensor can directly contact tested gas institute micrometer water number.But shortcoming is to carry out in strict accordance with the desired operating specification of instrument, and operating personnel's quality is had higher requirement, need artificial to the scene point-to-point measurement on the spot, waste time and energy; And metering system is to measure by the tested gas of discharging outside switch jar introversion, in order to make accuracy of reading with stable, must waste a large amount of gas, this not only can reduce equipment work air pressure, and also can't monitor for a long time promptly and can't monitor in real time measured value from security, can not in time grasp the variation of little water number in the high-voltage switch gear and find the situation that exceeds standard, can not carry out modern data monitoring and management, more seriously can cause the pollution of environment.

2, favourablely in recent years generalized information system density and little water number are measured in real time, data are shown on the switch board display at the scene, and be transferred to the pulpit and show and report to the police with electronic instrument and data transmission and processing technology.In the pulpit, the each point measured value is monitored like this, improved up-to-dateness, save field staff's workload.But wherein also come with some shortcomings, cut off inner because the requirement of generalized information system security causes little water sensor probe can not be installed to switch, so must by the self-styled valve on the tank body will sensor and switch keep apart in cutting off, be unlikely to influence the operate as normal of switch like this so that little water-mass density transmitter can carry out changeing of transmitter after breaking down.But this working method causes little water sensor probe can not directly touch the interior gas of switch, the transmitter internal cavity is a dead space, internal gas can not flow, and the micro-water content around the liquid water content that a small amount of little water that each connecting portion permeates is into added transmitter inner structure absorption causes sensor far above switch in actual water cut, and be difficult for diffusion.Cause little water sensor institute measured value to be higher than the little water number of true tested gas, such as the actual little water number of gas in the switch during less than 100PPm signal of sensor as calculated the result but can reach 300-500PPm, present actual practice is by software this difference correction to be come near actual value.And some added some producer in this field afterwards owing to lack correlation test and technical experience, space UNICOM in little water sensor and the switch simply thinks as long as can be measured real little water number, thereby the transmitter present position of being developed far and impermeable measure of gas in true jar is nowhere near, cause the sensor institute minimum change of moisture content trend of measured value not possess, irrelevant with actual value, certainly no matter how to revise also impossible approaching true little water number from software, end user unit had no alternative but to put it aside as useless.

Summary of the invention:

In order to overcome existing SF ₆Portable type measuring can not be realized on-line monitoring and need emit the SF that can cause decline of high-voltage switch gear internal pressure and contaminated environment in a large number in the little water gaging technology of gas ₆Gas, and the conventional online monitoring transducer can not directly reflect the shortcoming of tested gas micro-water content strictly according to the facts, the utility model provides a kind of measurement formula SF that circulates ₆Little water, density on-line monitoring transmitter, this transmitter not only can be realized on-line monitoring and can test the true micro-water content of gas in the direct reflection container as portable micro-water, and not need to emit tested gas.

The technical scheme that its technical matters that solves the utility model adopts is: transmitter interface, flange, transmitter body, aerodynamic force parts, humidity sensor, wireway, valve are formed one section gas passage device.The little water transmitter of on-line monitoring interface is passed through self-styled valve and high-voltage switch gear tank body UNICOM, other end valve forms a loop by self-styled valve on the tank body and high-voltage switch gear tank body UNICOM, the work of aerodynamic force parts, jar interior gas is released in this loop, arrive the transmitter inner chamber by interface, form in getting back to jar through pipeline, valve again and circulating, thus with gas in the jar release blow in the transmitter cavity on little water sensor inductive probe and then through wireway in valve is got back to jar.The gas that flows through little water sensor probe like this is jar gas of inner true micro-water content, so can reach the portable micro-water tester accurately, simultaneously because gas is self-loopa flow from and can under the situation that does not influence the normal operation of equipment, monitor in real time.

The beneficial effects of the utility model are that real realization can reflect the on-line monitoring transmitter of gas micro-water content strictly according to the facts.Simple and compact for structure, and guarantee desired resistance to pressure of high-voltage switch gear and sealingly secure, easy for installation, appended to add cost cheap.

Description of drawings:

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is a longitudinal profile of the present utility model structural map.

Fig. 2 is the structural map of embodiment.

.1. transmitter interface among Fig. 1,2. flange, 3. aerodynamic force parts, 4. transmitter body, 5. wireway, 6 sensor stands, 7. shell, the little water humidity sensor of 8.VISARA, 9. sensor holder, 10. pressure transducer, 11. circuit boards, 12. sintering seats, 13. terminal strip, 14. cable, 15. cable seal interfaces, 16. cushion rubbers.

Among Fig. 2.17. the high-voltage switch gear container, 18. self-styled valve A, 19. little water-mass density transmitters, 20. valve B, 21. self-styled valve C

Embodiment:

Body among Fig. 1 (4), a side have an aprons slot, and built-in cushion rubber (16) compresses sealing with the flange (2) that is welded with transmitter interface (1).Built-in aerodynamic force parts that make gas flow in the body (4).Body (4) opposite side has the wireway that is tightly connected with body (4), and a valve is arranged on the air guide pipeline.Among Fig. 2 transmitter is connected with the high-voltage switch gear container, transmitter interface (1) backs down self-styled valve A (18) on the container, self-styled valve C (21) backs down mutually on last valve B (20) of transmitter wireway (5) and the switch container, makes switch container, transmitter, wireway return container through self-styled valve B, C and forms a closed-loop path.

The cable (14) that comes from switch board among Fig. 1 is fixed on the housing by the cable seal interface, comprising signal wire, 4---20mA pressure signal line, 4---the 20mA moisture signal line and the ground wire of 24V direct current supply line, pilot-gas power part power supply.Receive on sintering seat (12) extension line by terminal strip, receive circuit board (11) through sintering seat line again, circuit board (11) is received the power supply and the signal wire of pressure transducer respectively, for it provides power supply and the millivolt signal of pressure transducer output is enlarged into 4---and the current signal output of 20mA.Being connected to it with the aerodynamic force parts provides power supply, links to each other with signal and ground wire with the power supply of the little water humidity sensor of VISARA (8), for it provides power supply and signal output.Receive switch board through the moisture signal of putting the output of big pressure signal of circuit board amplifier and humidity sensor through cable.

The work of aerodynamic force parts is with SF when transmitter is worked ₆Gas is extracted in the transmitter body (4) by the self-styled valve A that backs down and transmitter interface and blows on the little water humidity sensor of VISARA (8) probe, and the gas that flows through flows back in the container through the self-styled valve C of wireway (5) valve B (20) (21) again.So both can guarantee that the gas that little water sensor probe touches was the gas that contains the true micro-water content of internal tank, and not be subjected to junction infiltration and transmitter internal part liquid water content diffusion influence, thereby reach the purpose of finally measuring true micro-water content.

Little water-mass density on-line monitoring basic functional principle: pressure transducer is that bulk density and humidity are used, and measured pressure signal outputs to PLC draws 20 degree again in conjunction with the measured scene temperature calculated signals of scene temperature sensor pressure value P ₂₀, can represent density value, the used circuit of pressure amplifier is that general amplifying circuit does not belong to the no longer detailed description here of the utility model claim scope.

Because it is a process slowly that little water changes, even if taking place, leakage wait accident also can in time to find by pressure measurement signal, so in order to guarantee the life-span of unique movable member aerodynamic force parts in the transmitter, little water sensor and gas power part are not continuous workings, the signal triggering that used power supply will be sent by PLC just can be communicated with and work, and sets the time and the cycle of little water gaging by program setting.The dew point signal combination container inner pressure value and the scene temperature value of little water sensor output calculate gas water content PPM value in the container.This process is that PLC software design part does not belong to the utility model claim protection domain so be not described in detail.

Claims

1. one kind circulates measurement formula SF ₆Little water, density on-line monitoring transmitter is characterized in that transmitter interface (1), flange (2), aerodynamic force parts (3), humidity sensor (8), transmitter body (4), wireway (5), one section gas passage device of valve (20) composition.

2. the measurement formula SF that circulates according to claim 1 ₆Little water, density on-line monitoring transmitter is characterized in that body (4), and there is an aprons slot side, and built-in cushion rubber (16) compresses sealing with the flange (2) that is welded with transmitter interface (1).

3. the measurement formula SF that circulates according to claim 1 ₆Little water, density on-line monitoring transmitter is characterized in that built-in aerodynamic force parts that make gas flow in the body (4).

4. the measurement formula SF that circulates according to claim 1 ₆Little water, density on-line monitoring transmitter is characterized in that body (4) opposite side has the wireway that is tightly connected with body (4), has a valve on the air guide pipeline.