CN106094898B - A kind of gas relay flow velocity value coarse adjustment mechanism - Google Patents
A kind of gas relay flow velocity value coarse adjustment mechanism Download PDFInfo
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- CN106094898B CN106094898B CN201610526259.9A CN201610526259A CN106094898B CN 106094898 B CN106094898 B CN 106094898B CN 201610526259 A CN201610526259 A CN 201610526259A CN 106094898 B CN106094898 B CN 106094898B
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- flow rate
- flow velocity
- definite value
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- 230000007246 mechanism Effects 0.000 title claims abstract description 32
- 230000001105 regulatory effect Effects 0.000 claims abstract description 15
- 238000012795 verification Methods 0.000 claims abstract description 14
- 238000009423 ventilation Methods 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims description 18
- 230000009467 reduction Effects 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 9
- 238000012937 correction Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 7
- 238000004088 simulation Methods 0.000 abstract description 2
- 238000007689 inspection Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
Abstract
In order to solve in the existing coarse adjustment stage for carrying out flow rate verification to gas relay, existing coarse adjustment mechanism is not easy to adjust, the low problem of accuracy provides a kind of gas relay flow velocity value coarse adjustment mechanism there are complicated for operation the present invention.The regulating device, comprising: pressure fan, the pressure fan are continually and steadily blown with the quasi- corresponding gas flow rate definite value of regulating gas relay oil flow rate definite value to gas relay；Wind speed regulating valve, to adjust pressure fan wind speed, so that pressure fan wind speed is continuously adjusted in a certain range；Ventilation shaft connects the sealing pipeline of pressure fan and gas relay, provides path for gas flowing；Alarm mechanism provides instruction including the series loop that alarm element and alarm element and gas relay movable contact are formed for whether pressure fan wind speed reaches gas relay flow velocity definite value.Compared to the coarse adjustment method of traditional slide calliper rule+counterweight, gas relay flow velocity value coarse adjustment mechanism operation of the invention is more simple, and the course of work of the more preferable simulation gas relay of energy, so that the accuracy adjusted greatly improves.
Description
Technical field
The present invention relates to power system devices to verify correlative technology field, specifically, being related to a kind of gas relay stream
Speed value coarse adjustment mechanism.
Background technique
Gas relay is one of most important non-electricity protecting device of transformer, gas relay it is reliable whether, directly
Connect the safe and reliable operation for being related to transformer.In order to prevent because of its incorrect operation caused by gas relay problem itself, need
Inspection and periodic inspection before putting into operation to gas relay.
It is required according to " gas relay inspection procedure " DL/T 540-2013, examining project includes flow speed value verification (weight watt
This), volumetric values verification (light gas), sealing performance, the projects such as insulation performance, wherein flow speed value verification is the weight in inspection project
Want part.At present for the device of gas relay flow velocity value verification substantially using transformer oil as the gas relay school of medium
Test platform, oily mobility status in this kind of device energy real simulation transformer, can accurately to gas relay flow velocity value into
Row verification.But the device has following disadvantage: (1) volume is larger, is not suitable for verifying in engineering site；(2) due to its oil stream
Environment, it is more demanding to the installation compactness of gas relay on the platform, it has not been convenient to repeatedly to adjust.
For the accuracy for guaranteeing verification, currently used checking process is: carrying out first to the flow speed value of gas relay
Then relay is packed into verification platform again and is finely verified by coarse adjustment.
Tradition coarse adjustment mechanism and method are to carry out coarse adjustment with lever principle by the way of slide calliper rule+counterweight at present,
Scale of the counterweight on slide calliper rule is preset, with lever principle, is reached by regulating gas relay baffle elastic force flat
Weighing apparatus, so that it is determined that the flow speed value of gas relay, traditional coarse adjustment mechanism is not easy to adjust there are complicated for operation, and accuracy is low etc.
Problem.
Summary of the invention
The present invention is in order to solve in the existing coarse adjustment stage for carrying out flow rate verification to gas relay, existing coarse adjustment dress
It sets there are complicated for operation, is not easy to adjust, the low problem of accuracy provides a kind of gas relay flow velocity value coarse adjustment mechanism.
Technical problems to be solved needed for the present invention can be achieved through the following technical solutions:
A kind of gas relay flow velocity value coarse adjustment mechanism characterized by comprising
Pressure fan, the pressure fan is to intend gas flow rate definite value corresponding to regulating gas relay oil flow rate definite value to gas
Body relay is blown；
Ventilation shaft connects the sealing pipeline of pressure fan and gas relay；
Wind speed regulating valve is arranged on ventilation shaft, for adjusting pressure fan wind speed, so that pressure fan wind speed is in default model
It encloses interior continuously adjustable；
Alarm mechanism, the series loop including alarm element and the formation of alarm element and gas relay movable contact are
Whether pressure fan wind speed, which reaches gas relay flow velocity definite value, provides instruction.
In the present invention, the pressure fan wind speed range is 0-40m/s, can be blown, be sent to gas relay with constant wind speed
Wind wind speed is identical as gas flow rate definite value corresponding to the oil flow rate definite value of the quasi- gas relay adjusted.
In the present invention, the wind speed regulating valve is for adjusting pressure fan wind speed, so that pressure fan wind speed is in the pre- of 0-40m/s
If being continuously adjusted in range, while pressure fan air speed value can also be preset, and have gas flow rate display function.
In the present invention, the ventilation shaft is smooth seal pipeline, and caliber is Φ 25mm or Φ 50mm or Φ
80mm。
In the present invention, intend gas flow rate definite value (theoretical value) corresponding to the oil flow rate definite value of the gas relay adjusted,
Acquisition is directly calculated using fluid flow rate reduction formula.
Described, fluid flow rate reduction formula isWherein, VaFor the flow velocity of gas medium, VbFor oil medium
Flow velocity, ρaFor the density of gas medium, ρbFor the density of oil medium.
Alternatively, considering that the amendment reduction formula of temperature and pressure operating condition includes:
Wherein, VaFor the flow velocity of gas medium, VbFor the flow velocity of oil medium, ρaFor the density of gas medium, ρbFor oil medium
Density, QaFor gas medium flow, QbFor oil medium flow, T is absolute temperature, and S is gas relay in the face of current-carrying cross section
Product, P are pressure of the gas relay in current-carrying cross section, and t is actual temperature of the gas relay in current-carrying cross section.
In the present invention, intend gas flow rate definite value (experiential modification corresponding to the oil flow rate definite value of the gas relay adjusted
Value), it obtains in the following manner:
The quasi- verification gas relay of determining caliber is measured using oil medium calibration equipment, obtains the gas relay
Current oil flow rate definite value A1；
Using fluid flow rate reduction formula, oil flow rate definite value A when being verified using gas medium is calculated1Corresponding theory
Gas flow rate definite value B1；
More are taken multiple measurements with caliber with the gas relay of flow velocity definite value using gas medium calibration equipment, is remembered
It records the actual measurement gas flow rate definite value of every gas relay and calculates its average value C1av；
Utilize the average value C of actual measurement gas flow rate definite value1avTo Theoretical gas flow velocity definite value B1It is modified, and with average
Value C1avAs the corresponding gas flow rate definite value correction value of the caliber gas relay.
Gas relay flow velocity value coarse adjustment mechanism of the invention, it is easy to operate, adjust it is simple, compared to traditional slide calliper rule+
The coarse adjustment method of counterweight, preferably simulates the course of work of gas relay, and accommodation accuracy greatly improves.
Detailed description of the invention
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is the structural diagram of the present invention.
Specific embodiment
In order to make the technical means, creative features, achievement of purpose and effectiveness of the invention easy to understand, below with reference to tool
Body diagram, the present invention is further explained.
Idea of the invention is that by existing gas relay flow velocity coarse adjustment mechanism structure and working principle
Analysis finds in the existing coarse adjustment stage for carrying out flow rate verification to gas relay that it is multiple that existing coarse adjustment mechanism has operation
It is miscellaneous, be not easy to adjust, accuracy it is low the problem of, provide a kind of gas relay flow velocity value coarse adjustment mechanism through the invention to solve
The certainly above problem.
Referring to Fig. 1, gas relay flow velocity value coarse adjustment mechanism of the invention, including pressure fan, the effect of pressure fan be,
It is blown, is blown to gas relay with gas flow rate definite value corresponding to the oil flow rate definite value of the quasi- gas relay adjusted
Machine wind speed range is 0-40m/s, can be blown with constant wind speed to gas relay, and oil flow rate definite value can be situated between by traditional oil
Matter calibration equipment, which is checked, to be obtained.
Further include a set of ventilation shaft in present embodiment, the both ends of ventilation shaft respectively with pressure fan and gas relay
Device connection provides air-supply path for pressure fan and the wind of pressure fan is sent into gas relay, and ventilation shaft preferably uses
Smooth seal pipeline, caliber have tri- kinds of Φ 25mm, Φ 50mm, Φ 80mm specifications.
It include a wind speed regulating valve, setting is by the way that on pipeline, wind speed regulating valve is for adjusting in present embodiment
Pressure fan wind speed so that pressure fan wind speed is continuously adjusted in the range that 0-40m/s is preset, while can also preset pressure fan wind speed
Value, and have gas flow rate display function.
In addition, the invention also includes a set of alarm mechanism, the mechanism include alarm element and alarm element and gas after
The series loop that electric appliance movable contact is formed, alarm element can be using elements such as alarm lamp, buzzers.When enter gas after
The air flow velocity of electric appliance reaches the gas flow rate definite value of the gas relay, the contact closure, circuit conducting, sound-light alarm machine
Structure will start, and relay movable contact can be generally arranged inside gas relay.
The specific embodiment of apparatus of the present invention are as follows: after opening whole device, if alarm mechanism starts immediately, lead to
Wind speed regulating valve is crossed to turn the air flow velocity for entering gas relay to critical releasing of alarming down；If alarm structure is not immediately
The air flow velocity for entering gas relay is then tuned up by adjusting wind speed regulating valve, is opened until alarm mechanism is critical by starting
It is dynamic, think that current air flow velocity is that the gas flow rate of gas relay acts definite value at this time.Here, critical starting is
Refer to, if alarm mechanism is inactive at this time, slightly increases the gas flow rate for entering gas relay, alarm mechanism starts, instead
It is slightly reduced the gas flow rate into gas relay if alarm mechanism has been started up at this time, and alarm mechanism stops,
The numerical value for slightly increasing and being slightly reduced can be set to the least regulating amount of gas control valve.
For the present invention, intending gas flow rate definite value corresponding to the oil flow rate definite value of the gas relay adjusted is one
A important parameter, oil flow rate definite value as previously described can be checked by traditional oil medium calibration equipment and be obtained, then, it is corresponding
Gas flow rate definite value this acquisition can directly be calculated using fluid flow rate reduction formula.It can be by the way of following:
Gas relay can pass through formula by the flow of its nozzle current-carrying cross section: Q according to the size of its nozzle caliber
=Sv, is calculated, and wherein Q is the fluid flow by gas relay nozzle current-carrying cross section, and S is gas relay nozzle
The area of current-carrying cross section, v are the flow velocity of fluid.
So, the flow rate conversion formula based on two kinds of different mediums:It is assumed that ρaFor the close of gas medium
Degree, ρbFor the density of oil medium, in conjunction with aforementioned flow calculation formula, it can be deduced that fluid flow rate reduction formula isWherein, VaFor the flow velocity of gas medium, VbFor the flow velocity of oil medium.
Certainly, in above-mentioned fluid flow rate reduction formula, absolutely not influence of the consideration temperature and pressure to fluid, because
This, reduction formula above-mentioned may generate error under actual condition, solve the problem above-mentioned in the present invention, improve essence
Degree can preferably use formula below:
Wherein, VaFor the flow velocity of gas medium, VbFor the flow velocity of oil medium, ρaFor the density of gas medium, ρbFor oil medium
Density, QaFor gas medium flow, QbFor oil medium flow, T is absolute temperature, and S is gas relay in the face of current-carrying cross section
Product, P are pressure of the gas relay in current-carrying cross section, and t is actual temperature of the gas relay in current-carrying cross section.
Therefore, gas medium is being used air as, when using transformer oil as oil medium, it is known that standard air density pGas
=1.293kg/m3, transformer oil standard density ρOil=895kg/m3, can calculate corresponding to the oil flow rate definite value of gas relay
Gas flow rate definite value.According to nozzle diameter size, there are three types of specifications for gas relay at present: Φ 25mm, Φ 50mm, Φ
80mm can calculate the size of different tube diameters area of section S.
However, it is solid to be likely present equipment when carrying out coarse adjustment to gas relay using coarse adjustment mechanism of the invention
There are error, such as pressure fan air speed error, verification platform gas caliber Size Error constant error etc., the present invention is in order to further
Precision is promoted, additionally provides mode below to solve:
Firstly, for the quasi- gas relay for carrying out coarse adjustment of caliber is determined, to oil on traditional oil medium calibration equipment
Flow velocity is checked, such as is verified to the gas relay that a certain caliber is 50mm, and the oil stream of the gas relay is obtained
Fast definite value A1.Traditional oil medium calibration equipment can consider based on its working principle meets oil medium when gas relay works
The main purpose of the true value of flow velocity, this step lies also in this.
After completing above-mentioned steps, is calculated using fluid flow rate reduction formula and use gas medium (gas medium calibration equipment)
When carrying out gas relay verification, corresponding Theoretical gas flow velocity definite value B1, i.e., do not considering the presence of gas medium verifying attachment
In the case where any error, consider completely ideally, corresponding Theoretical gas flow velocity definite value, Theoretical gas flow velocity definite value is
The subsequent comparison basis being modified, can be by the way of following when specifically being calculated:
Gas relay can pass through formula by the flow of its nozzle current-carrying cross section: Q according to the size of its nozzle caliber
=Sv, is calculated, and wherein Q is the fluid flow by gas relay nozzle current-carrying cross section, and S is gas relay nozzle
The area of current-carrying cross section, v are the flow velocity of fluid.
So, the flow rate conversion formula based on two kinds of different mediums:It is assumed that ρaFor the close of gas medium
Degree, ρbFor the density of oil medium, in conjunction with aforementioned flow calculation formula, it can be deduced that fluid flow rate reduction formula isWherein, VaFor the flow velocity of gas medium, VbFor the flow velocity of oil medium.
Certainly, in above-mentioned fluid flow rate reduction formula, absolutely not influence of the consideration temperature and pressure to fluid, because
This, reduction formula above-mentioned can not preferably reflect that medium is changed to the relationship after gas theoretically from oil, be in the present invention
It solves the problem above-mentioned, can preferably formula below be used by improving precision:
Wherein, VaFor the flow velocity of gas medium, VbFor the flow velocity of oil medium, ρaFor the density of gas medium, ρbFor oil medium
Density, QaFor gas medium flow, QbFor oil medium flow, T is absolute temperature, and S is gas relay in the face of current-carrying cross section
Product, P are pressure of the gas relay in current-carrying cross section, and t is actual temperature of the gas relay in current-carrying cross section.
Therefore, gas medium is being used air as, when using transformer oil as oil medium, it is known that standard air density pGas
=1.293kg/m3, transformer oil standard density ρOil=895kg/m3, the corresponding Theoretical gas flow velocity of gas medium can be calculated
Definite value B1.According to nozzle diameter size, there are three types of specifications for gas relay at present: Φ 25mm, Φ 50mm, Φ 80mm can be calculated
The size of different tube diameters area of section S.
Then, same gas relay above-mentioned is verified on gas medium calibration equipment, determines the gas
The actual measurement gas flow rate definite value C of relay11, in the same way, choose n platform with caliber oil flow rate definite value is A to benefit1Gas
Relay determines the record C of each gas relay12、C13….C1nValue, calculate its average value C1av, average value C1av
The as average value of the actual measurement gas flow rate definite value of gas relay, at this point, by by average value C1avIt is fixed with Theoretical gas flow velocity
Value B1It is compared, utilizes the average value C of actual measurement gas flow rate definite value1avTo Theoretical gas flow velocity definite value B1It is modified, and with
Average value C1avAs the corresponding gas flow rate definite value correction value of gas relay, A can be obtained at this time1、B1、C1avSuch one group
Data, the respectively oil flow rate of the caliber gas relay, Theoretical gas flow velocity, amendment gas flow rate.
It similarly, can be for determining caliber difference oil flow rate definite value A2、A3…AnGas relay, can be according to above-mentioned
Method obtains its corresponding gas flow rate definite value correction value C2av、C3av…Cnav。
Only the preferred embodiment of the present invention has been described above, but is not to be construed as limiting the scope of the invention.This
Invention is not only limited to above embodiments, and specific structure is allowed to vary.In short, all guarantors in independent claims of the present invention
Made various change is within the scope of the invention in shield range.
Claims (5)
1. a kind of gas relay flow velocity value coarse adjustment mechanism characterized by comprising
Pressure fan, the pressure fan with gas flow rate definite value corresponding to quasi- regulating gas relay oil flow rate definite value to gas after
Electric appliance is blown；
Ventilation shaft connects the sealing pipeline of pressure fan and gas relay；
Wind speed regulating valve is arranged on ventilation shaft, for adjusting pressure fan wind speed, so that pressure fan wind speed is within a preset range
It is continuously adjustable；
Alarm mechanism, including the series loop that alarm element and alarm element and gas relay movable contact are formed, for air-supply
Whether machine wind speed, which reaches gas relay flow velocity definite value, provides instruction；
Gas flow rate definite value corresponding to the oil flow rate definite value of the quasi- gas relay adjusted is straight using fluid flow rate reduction formula
It connects calculating to obtain, fluid flow rate reduction formula isWherein, Va is the flow velocity of gas medium, and Vb is oil medium
Flow velocity, ρaFor the density of gas medium, ρbFor the density of oil medium, consider that the modified gas flow rate of temperature and pressure operating condition is fixed
Value reduction formula includes:
Wherein, VaFor the flow velocity of gas medium, VbFor the flow velocity of oil medium, ρaFor the density of gas medium, ρbFor the close of oil medium
Degree, QaFor gas medium flow, QbFor oil medium flow, T is absolute temperature, and S is area of the gas relay in current-carrying cross section, P
It is gas relay in the pressure of current-carrying cross section, t is actual temperature of the gas relay in current-carrying cross section.
2. a kind of gas relay flow velocity value coarse adjustment mechanism according to claim 1, which is characterized in that its feature exists
In: the wind speed range of the pressure fan is 0-40m/s, can persistently be blown with constant wind speed to gas relay.
3. a kind of gas relay flow velocity value coarse adjustment mechanism according to claim 1, which is characterized in that its feature exists
In: the wind speed regulating valve is continuously adjusted pressure fan wind speed in the preset range of 0-40m/s.
4. a kind of gas relay flow velocity value coarse adjustment mechanism according to claim 1, which is characterized in that its feature exists
In: the ventilation shaft is smooth seal pipeline, and caliber is Φ 25mm or Φ 50mm or Φ 80mm.
5. a kind of gas relay flow velocity value coarse adjustment mechanism according to any one of claims 1 to 4, which is characterized in that its
Be characterized in that: gas flow rate definite value corresponding to the oil flow rate definite value of the quasi- gas relay adjusted obtains in the following manner:
The quasi- verification gas relay of determining caliber is measured using oil medium calibration equipment, it is current to obtain the gas relay
Oil flow rate definite value A1；
Using fluid flow rate reduction formula, oil flow rate definite value A when being verified using gas medium is calculated1Corresponding Theoretical gas
Flow velocity definite value B1；
More are taken multiple measurements with caliber with the gas relay of flow velocity definite value using gas medium calibration equipment, record is every
The actual measurement gas flow rate definite value of platform gas relay simultaneously calculates its average value C1av；
Utilize the average value C of actual measurement gas flow rate definite value1avTo Theoretical gas flow velocity definite value B1It is modified, and with average value C1av
As the corresponding gas flow rate definite value correction value of the caliber gas relay.
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| CN201610526259.9A CN106094898B (en) | 2016-07-06 | 2016-07-06 | A kind of gas relay flow velocity value coarse adjustment mechanism |
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| CN201610526259.9A CN106094898B (en) | 2016-07-06 | 2016-07-06 | A kind of gas relay flow velocity value coarse adjustment mechanism |
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| CN106094898B true CN106094898B (en) | 2019-09-10 |
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