CN102023631B - Method for checking temperature compensation accuracy of SF6 density controller - Google Patents

Method for checking temperature compensation accuracy of SF6 density controller Download PDF

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CN102023631B
CN102023631B CN 201010594927 CN201010594927A CN102023631B CN 102023631 B CN102023631 B CN 102023631B CN 201010594927 CN201010594927 CN 201010594927 CN 201010594927 A CN201010594927 A CN 201010594927A CN 102023631 B CN102023631 B CN 102023631B
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density controller
temperature
pressure
density
temperature compensation
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CN102023631A (en
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甘大方
郑召北
吕春兰
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Beijing BLD Measuring and Control Meter Co., Ltd.
Beijing Brighty Instrument Co., Ltd.
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BEIJING BLD MEASURING AND CONTROL METER Co Ltd
BEIJING BRIGHTY INSTRUMENT Co Ltd
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Abstract

The invention discloses a method for checking the temperature compensation accuracy of an SF6 density controller, which comprises the following steps of: arranging the SF6 density controller in a thermotank of a preset checking temperature for a preset checking time; connecting a gas path of the SF6 density controller and the gas path of a standard pressure detection device; adjusting the pressure of the standard pressure detection device to an in-container pressure corresponding to the preset checking temperature; determining the display pressure of the SF6 density controller; and determining the temperature compensation accuracy of the SF6 density controller. In the method provided by the invention, only the SF6 density controller is arranged in the thermotank, and more SF6 density controllers can be arranged under the condition of not changing the space of the thermotank, so the checking efficiency is improved; and the standard pressure detection device simulates the pressure change of a container filled with an SF6 gas at different temperatures, so the problem of liquefaction of the SF6 gas is solved, and the temperature compensation accuracy of the SF6 density controller also can be checked at the checking temperature of -40 DEG C.

Description

A kind of check SF 6The method of density controller temperature compensation accuracy
Technical field
The present invention relates to pressure type SF 6The density controller applied technical field relates in particular to a kind of check SF 6The method of density controller temperature compensation accuracy.
Background technology
Sulfur hexafluoride density controller is (hereinafter to be referred as SF 6Density controller) be for monitoring and control SF 6Primary cut-out (claims again SF 6High-voltage switch gear) SF in 6The important instrument of gas density, SF 6Density controller is to guaranteeing SF 6Primary cut-out is so that the normal safe operation of whole transformer station, electrical network plays vital effect.
SF in container 6In the immovable situation of gas density, the SF in the container 6The pressure of γ-ray emission increases along with the rising of temperature, reduces along with the reduction of temperature.If monitor with conventional tensimeter, its gauge hand can change along with variation of ambient temperature, and SF 6Key property of density controller has temperature compensation function exactly.
SF 6The principle of work of density controller: temperature compensation means is installed by section within it, utilizes temperature compensation means to compensate the SF that causes because of temperature variation 6The change of density controller pointer.SF in device 6Under the constant prerequisite of gas density, no matter the variation how operating ambient temperature changes and bring the device internal pressure, SF 6The pointer of density controller always refers in its rated pressure position, is only causing SF in the device because gas leakage occurs equipment 6In the situation that gas density descends, SF 6The pointer of density controller just can change, thereby reaches monitoring and control SF 6SF in the primary cut-out 6The effect of gas density.
This shows that temperature compensation means is at whole SF 6Vital role in the density controller.Guarantee the normal accurately work of temperature compensation means, will guarantee the accuracy of this important technology index of its temperature compensation.
At present, check SF 6The process of density controller temperature compensation accuracy can be referring to Fig. 1: with tested SF 6Density controller 1 is installed on the inspecting containers 2, opens the ball valve 3 that is connected with inspecting containers 2, is filled with SF in inspecting containers 2 6Gas is adjusted to SF with the pressure of inspecting containers 2 6The rated pressure of density controller is closed ball valve 3, afterwards with SF 6Density controller 1 and inspecting containers 2 are put into constant temperature oven 4, with the adjustment of constant temperature oven 4 test temperature to standard code, after the test period of standard code, read SF 6The desired value of density controller 1 pointer is judged SF 6Whether the temperature compensation of density controller 1 is accurate.
Since in testing process, must be with tested SF 6Density controller 1 and inspecting containers 2 are put into constant temperature oven 4, SF simultaneously 6The space that density controller 1 and inspecting containers 2 take is larger, uses present constant temperature oven, at every turn can only be to 3 SF 6Density controller detects, and each detection can take 8 hours, and detection efficiency is low, because SF 6Density controller must carry out the check of amount of temperature compensation before dispatching from the factory, so the existing method of inspection can't satisfy Production requirement.In addition, the check temperature of standard code is-40 ℃ ~ 70 ℃, in the inspection instrument 2 is pure SF if be filled with 6Gas, so SF under-40 ℃ check temperature 6Gas can liquefy, at this moment SF 6Density controller can't inspection container 2 pressure, in order to solve SF 6The problem of gas liquefaction pours SF in inspection instrument 2 6And N 2Mixed gas, but now about SF in the mixed gas 6And N 2The unified regulation of ratio, this causes assay to lose accuracy.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of check SF 6The method of density controller temperature compensation accuracy can improve checkability, satisfy Production requirement, and can accurately check SF under-40 ℃ check temperature 6The temperature compensation accuracy of density controller.
For achieving the above object, the invention provides following technical scheme:
A kind of check SF 6The method of density controller temperature compensation accuracy comprises:
Place described SF 6Density controller is default proving time in the constant temperature oven that is in default check temperature, and can guarantee described SF described default proving time 6The temperature of density controller is consistent with described default check temperature;
With described SF 6Density controller takes out from described constant temperature oven, connects described SF 6The gas circuit of the gas circuit of density controller and normal pressure pick-up unit;
Regulate the pressure of described normal pressure pick-up unit to the device internal pressure corresponding with described default check temperature;
Determine described SF 6The demonstration pressure of density controller;
Judge described SF 6Whether the demonstration pressure of density controller is consistent with rated pressure, if consistent, described SF then 6The temperature compensation of density controller is accurate, otherwise described SF 6The temperature compensation of density controller is inaccurate.
Preferably, in said method, further comprise the step of determining the device internal pressure corresponding with described default check temperature, concrete, determine the device internal pressure corresponding with described default check temperature according to following formula:
P Device=P Volume+ K * △ t
Wherein, P DeviceFor being filled with SF 6The device internal pressure of the container of gas, P VolumeBe SF 6The rated pressure of density controller, K is and P VolumeCorresponding temperature compensation coefficient, △ t is the difference between default check temperature and 20 ℃.
Preferably, in said method, the value of described K is:
P VolumeDuring for 0.3MPa, described K is 0.0015MPa/ ℃;
P VolumeDuring for 0.4MPa, described K is 0.002MPa/ ℃;
P VolumeDuring for 0.5MPa, described K is 0.0025MPa/ ℃;
P VolumeDuring for 0.6MPa, described K is 0.003MPa/ ℃.
Preferably, in said method, further comprise the described SF of record 6The step of the demonstration pressure of density controller.
Preferably, in said method, described default check temperature is the arbitrary numerical value in-40 ℃ ~ 70 ℃.
Preferably, in said method, described normal pressure pick-up unit is master gauge.
Preferably, in said method, described normal pressure pick-up unit is gas bomb.
This shows, at check SF disclosed by the invention 6In the method for density controller temperature compensation accuracy, only with SF 6Density controller is put into constant temperature oven and is heated up or lower the temperature, and simultaneously inspecting containers is put into constant temperature oven in the existing method and compares, and can put into the SF of greater number in the situation of constant temperature oven space invariance 6Density controller has improved detection efficiency, can better meet Production requirement; And in the present invention according to and device internal pressure corresponding to default check temperature come the pressure of adjustment criteria pressure-detecting device, simulated by the normal pressure pick-up unit and be filled with SF 6The pressure of the container of gas under different temperatures changes, and does not have SF 6So the problem of gas liquefaction is also can be to SF when detected temperatures is-40 ℃ 6The temperature compensation accuracy of density controller detects.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention, the below will do simple introduction to the accompanying drawing of required use among the embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is for adopting existing method check SF 6SF in the density controller temperature compensation accuracy process 6Density controller is the placement location synoptic diagram in constant temperature oven;
Fig. 2 is a kind of check SF disclosed by the invention 6The process flow diagram of the method for density controller temperature compensation accuracy;
Fig. 3 is for adopting method check SF shown in Figure 2 6SF in the density controller temperature compensation accuracy process 6Density controller is the placement location synoptic diagram in constant temperature oven;
Fig. 4 is another kind of check SF disclosed by the invention 6The process flow diagram of the method for density controller temperature compensation accuracy.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making under the creative work prerequisite, and the every other embodiment that obtains belongs to protection domain of the present invention.
The invention discloses a kind of check SF 6The method of density controller temperature compensation accuracy can improve checkability, satisfy Production requirement, and can accurately check SF under-40 ℃ check temperature 6The temperature compensation accuracy of density controller.
Referring to Fig. 2, Fig. 2 is check SF disclosed by the invention 6The process flow diagram of the method for density controller temperature compensation accuracy.Comprise:
Step S1: place SF 6Density controller is default proving time in the constant temperature oven that is in default check temperature.
With SF 6Density controller is positioned in the constant temperature oven, and the temperature of control constant temperature oven is in default check temperature, and this default check temperature can be the arbitrary value in-40 ℃ ~ 70 ℃ in the standard code, with SF 6Density controller is placed default proving time in constant temperature oven, can guarantee SF this default proving time 6The temperature of density controller is consistent with default check temperature.
Step S2: connect SF 6The gas circuit of the gas circuit of density controller and normal pressure pick-up unit.
Work as SF 6Density controller is placed default proving time in the constant temperature oven that is in default check temperature after, with SF 6Density controller takes out from constant temperature oven, and with SF 6The gas circuit of density controller is connected with the gas circuit of normal pressure pick-up unit.
Step S3: the pressure of adjustment criteria pressure-detecting device is to the device internal pressure corresponding with default check temperature.
The device internal pressure corresponding with default check temperature refers to: be filled with SF 6The container of gas is guaranteeing in the constant situation of gas density, is being in the pressure that produces under the default check temperature.This is filled with SF 6Pressure and SF that the container of gas produces in the time of 20 ℃ 6The rated pressure of density controller is consistent, the SF in container 6In the constant situation of gas density, the residing temperature of container can cause SF in the container 6The variation of gaseous tension, the residing temperature of container is different can to produce different device internal pressures.By the normal pressure pick-up unit is carried out supercharging or decompression, make the actual pressure of normal pressure pick-up unit reach the device internal pressure corresponding with default check temperature.In the enforcement, what be filled with in the normal pressure pick-up unit can be air or nitrogen.
Step S4: determine SF 6The demonstration pressure of density controller.
SF 6The demonstration pressure of density controller refers to SF 6The desired value of the pointer of density controller.This demonstration pressure is not the actual pressure value of normal pressure pick-up unit, but through SF 6Density controller carries out the force value after the temperature compensation.
Step S5: judge SF 6Whether the demonstration pressure of density controller is consistent with rated pressure, if consistent, then turns to step S61, otherwise, turn to step S62.
Step S61: determine SF 6The temperature compensation of density controller is accurate.
Step S62: determine SF 6The temperature compensation of density controller is inaccurate.
The pressure of normal pressure pick-up unit is with consistent corresponding to the device internal pressure of default check temperature, namely be filled with SF 6The pressure that the container of gas produces under default check temperature is consistent.Pressure simulation by the adjustment criteria pressure-detecting device be filled with SF 6The container of gas changes with the different pressure that produce of temperature.SF 6The purpose that density controller carries out temperature compensation is exactly to eliminate the SF that is filled with that temperature factor causes 6The pressure of gas container changes, and guarantees SF 6The demonstration pressure of density controller be filled with SF 6The pressure of gas container in the time of 20 ℃ is consistent, namely guarantees SF 6The demonstration pressure of density controller is consistent with rated pressure.Therefore by comparing SF 6Demonstration pressure and the rated pressure of density controller can be judged SF 6Whether the temperature compensation of density controller is accurate.
SF in container 6In the situation that gas density remains unchanged, if SF 6Density controller can carry out accurately temperature compensation, so SF 6Demonstration pressure and the SF of density controller 6The rated pressure of density controller is consistent, if SF 6Density controller can not carry out accurately temperature compensation, so SF 6Demonstration pressure and the SF of density controller 6Difference can appear in the rated pressure of density controller, by comparing SF 6Demonstration pressure and the rated pressure of density controller can be judged this SF 6Whether the temperature compensation of density controller is accurate.
Need to prove that the position of step S3 is not limited to shown in Figure 2, can be arranged at equally before step S1 and/or the step S2.
At check SF disclosed by the invention 6In the method for density controller temperature compensation accuracy, only with SF 6Density controller 1 is put into constant temperature oven 4 and is heated up or lower the temperature (SF 6The placement location of density controller in constant temperature oven is as shown in Figure 3), and simultaneously inspecting containers is put into constant temperature oven in the existing method and compare, in the situation of constant temperature oven 4 space invariances, can put into the SF of greater number 6Density controller 1 has improved detection efficiency, can better meet Production requirement; And in the present invention according to and device internal pressure corresponding to default check temperature come the pressure of adjustment criteria pressure-detecting device, simulated by the normal pressure pick-up unit and be filled with SF 6The pressure of the container of gas under different temperatures changes, and does not have SF 6So the problem of gas liquefaction is also can be to SF when detected temperatures is-40 ℃ 6The temperature compensation accuracy of density controller detects.
Referring to Fig. 4, Fig. 4 is another kind of check SF disclosed by the invention 6The process flow diagram of the method for density controller temperature compensation accuracy.Compare with flow process shown in Figure 2, further increased step S7.
Step S7: determine the device internal pressure corresponding with described default check temperature.
The device internal pressure corresponding with default check temperature can be determined by multiple means.For example, will be filled with SF 6The container of gas is positioned under the different probe temperatures, use the usual pressure pick-up unit to detect the device internal pressure of container under the different temperatures, and log, when needs are determined the device internal pressure corresponding with default check temperature, can obtain by in test findings, searching.
In addition, the present patent application people finds through research, has corresponding relation between device internal pressure and the default check temperature, can determine the device internal pressure corresponding with described default check temperature according to following formula:
P Device=P Volume+ K * △ t
Wherein, P DeviceFor being filled with SF 6The device internal pressure of the container of gas, P VolumeBe P VolumeBe SF 6The rated pressure of density controller, K is and P VolumeCorresponding temperature compensation coefficient, △ t is the difference between default check temperature and 20 ℃.
In addition, the value of K is by P VolumeValue determine:
P VolumeDuring for 0.3MPa, described K is 0.0015MPa/ ℃;
P VolumeDuring for 0.4MPa, described K is 0.002MPa/ ℃;
P VolumeDuring for 0.5MPa, described K is 0.0025MPa/ ℃;
P VolumeDuring for 0.6MPa, described K is 0.003MPa/ ℃.
The position that it is pointed out that step S7 is not limited only to shown in Figure 4, carries out before step S3 as long as guarantee step S7.
Preferably, further comprise record SF 6The step of the demonstration pressure of density controller.Same batch SF according to record 6The demonstration pressure of density controller can be determined this batch SF 6The qualification rate of density controller is convenient to the problem that exists in the production run is analyzed.
Preferably, the normal pressure pick-up unit can adopt master gauge or gas bomb.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the disclosed device of embodiment, because it is corresponding with the disclosed method of embodiment, so description is fairly simple, relevant part partly illustrates referring to method and gets final product.

Claims (7)

1. check SF for one kind 6The method of density controller temperature compensation accuracy is characterized in that, comprising:
Place described SF 6Density controller is default proving time in the constant temperature oven that is in default check temperature, and can guarantee described SF described default proving time 6The temperature of density controller is consistent with described default check temperature;
With described SF 6Density controller takes out from described constant temperature oven, connects described SF 6The gas circuit of the gas circuit of density controller and normal pressure pick-up unit;
Regulate the pressure of described normal pressure pick-up unit to the device internal pressure corresponding with described default check temperature;
Determine described SF 6The demonstration pressure of density controller;
Judge described SF 6Whether the demonstration pressure of density controller is consistent with rated pressure, if consistent, described SF then 6The temperature compensation of density controller is accurate, otherwise described SF 6The temperature compensation of density controller is inaccurate.
2. method according to claim 1 is characterized in that, further comprises the step of determining the device internal pressure corresponding with described default check temperature, and is concrete, determines the device internal pressure corresponding with described default check temperature according to following formula:
P Device=P Volume+ K * △ t
Wherein, P DeviceFor being filled with SF 6The device internal pressure of the container of gas, P VolumeBe SF 6The rated pressure of density controller, K is and P VolumeCorresponding temperature compensation coefficient, △ t is the difference between default check temperature and 20 ℃.
3. method according to claim 2 is characterized in that, the value of described K is:
P VolumeDuring for 0.3MPa, described K is 0.0015MPa/ ℃;
P VolumeDuring for 0.4MPa, described K is 0.002MPa/ ℃;
P VolumeDuring for 0.5MPa, described K is 0.0025MPa/ ℃;
P VolumeDuring for 0.6MPa, described K is 0.003MPa/ ℃.
4. method according to claim 1 is characterized in that, further comprises the step of the demonstration pressure that records described SF6 density controller.
5. method according to claim 1 is characterized in that, described default check temperature is the arbitrary numerical value in-40 ℃ ~ 70 ℃.
6. method according to claim 1 is characterized in that, described normal pressure pick-up unit is master gauge.
7. method according to claim 1 is characterized in that, described normal pressure pick-up unit is gas bomb.
CN 201010594927 2010-12-17 2010-12-17 Method for checking temperature compensation accuracy of SF6 density controller Active CN102023631B (en)

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CN108226768A (en) * 2017-11-20 2018-06-29 国家电网公司 Temperature-compensating check system and method

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CN201327464Y (en) * 2008-11-15 2009-10-14 赤峰电业局 Density and humidity network monitoring device for SF6 circuit breaker of power system

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CN201297986Y (en) * 2008-09-26 2009-08-26 上海电力设备安装有限公司 Calibration stand of SF* gas density-pressure monitoring device
CN201327464Y (en) * 2008-11-15 2009-10-14 赤峰电业局 Density and humidity network monitoring device for SF6 circuit breaker of power system

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王朗珠, 何明芳, 刘秀莲.六氟化硫断路器的监测、监控过程中的环境温度补偿办法.《重庆电力高等专科学校学报》.2003,第8卷(第01期),第8－11页. *

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