CN210604898U - Self-made piezodensity relay checking device - Google Patents
Self-made piezodensity relay checking device Download PDFInfo
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- CN210604898U CN210604898U CN201921494368.2U CN201921494368U CN210604898U CN 210604898 U CN210604898 U CN 210604898U CN 201921494368 U CN201921494368 U CN 201921494368U CN 210604898 U CN210604898 U CN 210604898U
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Abstract
The utility model relates to a self-made pressure density relay calibration device, which comprises an air compression pump, a first valve, an air storage tank, a pressure switch and/or a first pressure sensor, a pressure reducing valve, a proportional control valve and a measuring plug connector, wherein the air compression pump and the first valve are sequentially connected to form a part of a pressure making branch circuit, and the pressure making branch circuit is connected with an air inlet of the air storage tank; the pressure switch and/or the first pressure sensor, the pressure reducing valve, the proportion regulating valve and the measuring plug are sequentially connected to form a part of the detection branch, and the detection branch is connected with an air inlet of the air storage tank. The utility model discloses a make the densityby oneselfThe relay calibration device uses air as an air source, and forms a stable and continuous pressure air source by utilizing the pressure-making branch, so that the requirement for calibrating the action characteristic of the density relay can be met. Utilize compressed air to replace SF6Gas, avoiding the use of SF6The gas causes environmental pollution and the like, and does not need to carry SF6The gas cylinder and the checking device are convenient to carry and operate.
Description
Technical Field
The utility model relates to a to density relay's check-up technical field, concretely relates to from making densitometer relay calibration equipment.
Background
SF6The switch and the mutual inductor are high-voltage electric appliances widely used in an electric power system. SF6Reliable operation of switches and transformers has become one of the most concerned problems for the supply and utilization departments. SF6The gas density relay is used for monitoring SF in operation6The performance of the important elements of the gas density change in the switch and the mutual inductor body directly influences the SF6The operation of the switch is safe. SF for field operation6Because the gas density relay does not act frequently, the phenomena of inflexible action, poor contact of contacts and the like often occur after a period of time, the temperature compensation performance of the density relay is also deteriorated in some cases, and SF is often caused when the environmental temperature changes suddenly6The density relay malfunctions. Therefore, DL/T596-1996 "preventive test procedure for Power plants" stipulates that: each SF6Switch unit of use should regularly cope with SF6And checking the gas density relay.
For example, the utility model patent with the publication number CN200986521Y (the same applicant as the present case)) Disclosed is an SF6The gas density relay calibrator comprises a temperature measuring device and a gas cylinder, wherein the gas cylinder is connected with a host machine, and the host machine is connected with a tested SF (sulfur hexafluoride) through a connector6And the gas density relay is connected. The gas cylinder is connected with the gas path quick-change plug, the gas inlet socket and the input port of the pressure regulating valve in sequence through a pipeline, and the output port of the pressure regulating valve is connected with the SF to be tested through a test gas pipe6And the gas density relay is connected. The calibrator is suitable for laboratory use and can be used for on-site calibration as follows.
The utility model patent of grant publication No. CN202221468U (the same applicant as the present case) discloses a gas density relay check gauge, this check gauge includes the stage body, sets up measurement plug, the plug that admits air on the stage body, by check density relay signal acquisition joint, is equipped with electrical control unit, gas accuse unit in the stage body. The air control unit comprises a pressure regulating valve and an air discharge electromagnetic valve, the pressure regulating valve is connected with the single chip microcomputer, and an air inlet of the pressure regulating valve is communicated with the air bottle.
If the equipment is checked in large batch, the SF to be carried and used6More gas, SF discharged to atmosphere6Gas is increased therewith, SF6The gases are also a considerable potential hazard to the greenhouse effect for two reasons: (1) SF6The potential effect of the molecule on the greenhouse effect is large, one SF6The effect of gas molecules on the greenhouse effect is CO223900 times as much gas as it is. (2) SF6After the gas is discharged into the atmosphere, the gas has long existence time, about 3200 years. To minimize the pollution to the atmosphere, the SF of each electrical equipment is minimized in design6The amount of gas used, and the amount of leakage and discharge are reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a from making densitometer relay calibration equipment to what solve current densitometer of relay calibration instrument adoption is SF6The gas is discharged into the atmosphere, thus causing atmospheric pollution and resource waste.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the self-pressure-making density relay checking device comprises an air compression pump, a first valve, an air storage tank, a pressure switch and/or a first pressure sensor, a pressure reducing valve, a proportion regulating valve and a measuring plug connector, wherein the air compression pump and the first valve are sequentially connected to form one part of a pressure making branch, and the pressure making branch is connected to an air inlet of the air storage tank;
the pressure switch and/or the first pressure sensor, the pressure reducing valve, the proportion regulating valve and the measuring plug are sequentially connected to form a part of the detection branch, and the detection branch is connected with an air inlet of the air storage tank.
Further, the pressure making branch also comprises an air dryer, and the air dryer is connected with an inlet of the air compression pump and is used for drying air.
Furthermore, the pressure-making branch also comprises a second valve, the first valve is an air inlet electromagnetic valve, the second valve is an air discharge electromagnetic valve, the second valve is arranged on an air discharge pipeline, and the air discharge pipeline is connected to a pipeline between the first valve and the air compression pump.
Further, the pressure making branch further comprises an oil-water separator, and the oil-water separator is connected to a pipeline between the first valve and the gas storage tank.
Further, the pressure switch and the first pressure sensor are both arranged at the position of an air outlet of the air storage tank.
Furthermore, a second pressure sensor is arranged between the measuring plug connector and the proportion regulating valve on the detection branch.
Further, the first valve and the second valve are both solenoid valves.
The utility model has the advantages that:
the utility model discloses a from making densifier calibration equipment uses the air as the air supply, utilizes to make the pressure branch road, forms stable continuous pressure air supply, can satisfy the demand of doing the check-up to densifier's action characteristic. First, compressed air is used instead of SF6Gas, avoiding the use of SF6The gas causes environmental pollution and resource waste, and the checking cost is saved; secondly, the novel checking device is self-pressure-making, and does not need to carry SF6The gas cylinder is convenient to carry and operate.
Drawings
Fig. 1 is a schematic diagram of a gas path principle of a self-built piezodensity relay checking device.
Names corresponding to the marks in the figure:
1. air dryer, 2, air compressor pump, 3, second solenoid valve, 4, first solenoid valve, 5, oil water separator, 6, gas holder, 7, first pressure sensor, 8, pressure switch, 9, relief pressure valve, 10, proportion control valve, 11, second pressure sensor, 12, measurement bayonet joint.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.
The embodiment of the utility model provides a:
as shown in fig. 1, the self-made pressure density relay calibration device includes an air compression pump 2, a first solenoid valve 4, an air storage tank 6, a pressure switch 8, a first pressure sensor 7, a pressure reducing valve 9, a proportional control valve 10, and a measurement plug 12. The air compression pump 2 and the first electromagnetic valve 4 are sequentially connected to form a part of a pressure making branch, and the pressure making branch is connected to an air inlet of the air storage tank 6.
The pressure switch 8(1.5MPa), the first pressure sensor 7(1.6MPa), the pressure reducing valve 9 (1.05-1.1 MPa), the proportion adjusting valve 10 and the measuring plug 12 are sequentially connected to form a part of a detection branch, and the detection branch is connected with an air inlet of the air storage tank 6.
The pressure making branch further comprises an air dryer 1, a second electromagnetic valve 3 and an oil-water separator 5, wherein the air dryer 1 is connected with an inlet of the air compression pump 2 and used for drying air. Type of air dryer: HFD-MINI.
The first electromagnetic valve 4 is an air inlet electromagnetic valve, the second electromagnetic valve 3 is an air discharge electromagnetic valve, the second electromagnetic valve 3 is arranged on an air discharge pipeline, and the air discharge pipeline is connected to a pipeline between the first electromagnetic valve 4 and the air compression pump 2.
The oil-water separator 5 is connected on a pipeline between the first electromagnetic valve 4 and the gas storage tank 6, and the oil-water separator 5 is an automatic oil-water separator and is used for timely discharging moisture in gas output by the compressed air pump.
The pressure switch 8 and the first pressure sensor 7 are both arranged at the air outlet position of the air storage tank 6. When the pressure value of the air storage tank 6 reaches the preset value, the pressure switch 8 acts to close the air compressor, and the supply of the pressure air source is stopped. The first pressure sensor 7 can also detect the pressure of the air storage tank 6, and plays a role of double protection together with the pressure switch 8.
And a second pressure sensor 11(1MPa) is also arranged between the measuring plug 12 and the proportion regulating valve 10 on the detection branch for detecting the pressure of the checking gas. The measuring plug 12 is communicated with the air outlet of the proportional control valve 10, the air inlet of the proportional control valve 10 is communicated with the pressure reducing valve 9, and the proportional control valve 10 is also provided with an air outlet.
The air compression pump 2, the first electromagnetic valve 4, the pressure switch 8, the first pressure sensor 7, the proportion adjusting valve 10, the second electromagnetic valve 3 and the second pressure sensor 11 in the embodiment are all connected with the central control unit, the central control unit can adopt a single chip microcomputer, and the type of the single chip microcomputer is W78E 516.
The air compression pump 2 in this embodiment is model WA80, and has a large output air pressure and small vibration.
The utility model discloses a make densitometer calibration equipment from at the during operation, the step is as follows:
(1) the first pressure sensor detects the pressure in the current gas circuit and feeds a pressure signal back to the central control unit, and if the pressure signal does not meet the range of the standard gas circuit pressure, the first electromagnetic valve 4 and the second electromagnetic valve 3 are closed, and the air compression pump 2 is started.
(2) After the air compression pump 2 is started and proper time is delayed, the first electromagnetic valve 4 is opened, and outside air sequentially passes through the air dryer 1, the air compression pump 2, the first electromagnetic valve 4 and the oil-water separator 5 and enters the air storage tank 6.
(3) After the gas is continuously input, the pressure in the gas storage tank 6 is increased, when the pressure value of the gas storage tank 6 reaches the preset value, the pressure switch 8 acts to close the air compression pump 2, and the self-pressure-making process is completed.
(4) When the measuring plug 12 is connected with a density relay to be measured to start measurement, the central control unit sends out an instruction for opening the proportion regulating valve 10, the gas in the gas storage tank 6 is reduced in pressure by the pressure reducing valve 9 and then reaches the proportion regulating valve 10, and the gas for measurement with stable pressure and stable flow rate is regulated according to set parameters.
(5) In the checking process, when the gas pressure is insufficient, the gas pressure is detected by the pressure sensor and fed back to the central control unit, and the central control unit sends an instruction for starting the air compression pump 2, namely, the step (2) is executed; after the verification is finished, the second electromagnetic valve 3 is opened to release the gas in the gas path, so that the gas path is reduced to a safe pressure range, and the verification process is finished.
The utility model discloses a from making densifier calibration equipment uses the air as the air supply, utilizes to make the pressure branch road, forms stable continuous pressure air supply, satisfies to do the check-up to densifier's action characteristic. On the one hand compressed air is used to replace SF6Gas, avoiding the use of SF6The gas causes environmental pollution and resource waste, and the checking cost is saved; on the other hand, the novel checking device is self-pressure-making, and does not need to carry SF6The gas cylinder is convenient to carry and operate.
In other embodiments, the first electromagnetic valve and the second electromagnetic valve may also adopt other types of valves, such as an electric valve, a pneumatic valve, and the like, and the on-off of the air path can be controlled.
In other embodiments, the first pressure sensor may not be provided, or the pressure switch may not be provided, and the first pressure sensor may be used instead of the pressure switch.
Claims (7)
1. Make the check-up device of pressure density relay certainly, its characterized in that: the device comprises an air compression pump, a first valve, an air storage tank, a pressure switch and/or a first pressure sensor, a pressure reducing valve, a proportion regulating valve and a measuring plug connector, wherein the air compression pump and the first valve are sequentially connected to form a part of a pressure making branch, and the pressure making branch is connected to an air inlet of the air storage tank;
the pressure switch and/or the first pressure sensor, the pressure reducing valve, the proportion regulating valve and the measuring plug are sequentially connected to form a part of the detection branch, and the detection branch is connected with an air inlet of the air storage tank.
2. The self-made piezodensity relay verification device according to claim 1, wherein: the pressure making branch also comprises an air dryer, and the air dryer is connected with an inlet of the air compression pump and is used for drying air.
3. The self-made piezodensity relay verification device according to claim 1, wherein: the pressure-making branch circuit further comprises a second valve, the first valve is an air inlet electromagnetic valve, the second valve is an air discharging electromagnetic valve, the second valve is arranged on an air discharging pipeline, and the air discharging pipeline is connected to a pipeline between the first valve and the air compression pump.
4. The self-built piezodensity relay verification device according to claim 2 or 3, wherein: the pressure making branch further comprises an oil-water separator, and the oil-water separator is connected to a pipeline between the first valve and the gas storage tank.
5. The self-made piezodensity relay verification device according to claim 1, wherein: the pressure switch and the first pressure sensor are both arranged at the position of an air outlet of the air storage tank.
6. The self-made piezodensity relay verification device according to claim 1, wherein: and a second pressure sensor is also arranged between the measuring plug connector and the proportion regulating valve on the detection branch.
7. The self-made piezodensity relay verification device according to claim 3, wherein: the first valve and the second valve are electromagnetic valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921494368.2U CN210604898U (en) | 2019-09-09 | 2019-09-09 | Self-made piezodensity relay checking device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921494368.2U CN210604898U (en) | 2019-09-09 | 2019-09-09 | Self-made piezodensity relay checking device |
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| CN210604898U true CN210604898U (en) | 2020-05-22 |
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| CN201921494368.2U Active CN210604898U (en) | 2019-09-09 | 2019-09-09 | Self-made piezodensity relay checking device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200293A (en) * | 2021-11-22 | 2022-03-18 | 贵州电网有限责任公司 | Compressed air type density relay calibration device |
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2019
- 2019-09-09 CN CN201921494368.2U patent/CN210604898U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200293A (en) * | 2021-11-22 | 2022-03-18 | 贵州电网有限责任公司 | Compressed air type density relay calibration device |
| CN114200293B (en) * | 2021-11-22 | 2023-09-05 | 贵州电网有限责任公司 | Compressed air type density relay calibration device |
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