CN210141986U - Portable transformer pressure relief valve field calibration system - Google Patents
Portable transformer pressure relief valve field calibration system Download PDFInfo
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- CN210141986U CN210141986U CN201920917091.3U CN201920917091U CN210141986U CN 210141986 U CN210141986 U CN 210141986U CN 201920917091 U CN201920917091 U CN 201920917091U CN 210141986 U CN210141986 U CN 210141986U
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Abstract
The utility model relates to the field calibration technical field of pressure relief valves, in particular to a portable transformer pressure relief valve field calibration system, which comprises a master control device, a pressure transmitter and a box body; the main control device comprises a microprocessor, a touch display screen and an air compressor; the pressure transmitter comprises an air storage tank, a test tank, a first electromagnetic valve, a second electromagnetic valve and a pressure sensor. The tester sends a user operation instruction to the microprocessor through the touch display screen, the microprocessor controls the air compressor, the first electromagnetic valve and the second electromagnetic valve to be opened and closed for testing, meanwhile, the pressure sensor sends back monitored pressure information of the test tank in real time, and the microprocessor sends back the pressure information to the touch display screen after analyzing and processing the pressure information and displays the pressure information for the tester. The utility model discloses small, light in weight can carry and test to the main change maintenance scene, can save a large amount of pressure relief valve censorship time.
Description
Technical Field
The utility model relates to a pressure release valve's on-spot check-up technical field, concretely relates to portable transformer pressure release valve on-spot check-up system.
Background
The transformer pressure relief valve is an important element for non-electric quantity protection of the transformer, and is a main means for preventing the transformer oil tank from being burst due to overlarge internal fault pressure. When a short-circuit fault occurs in the transformer, the transformer oil is rapidly decomposed under the heat effect of the short-circuit current, a large amount of gas is generated, the pressure of the oil tank is increased, and if the pressure release valve cannot be effectively opened at the moment, the oil tank of the transformer can be cracked. After the pressure relief valve is opened, the pressure relief valve needs to be effectively closed along with the reduction of the pressure of the oil tank, otherwise, the transformer oil is leaked and the inside of the oil tank is polluted. Therefore, the opening and closing performance of the pressure relief valve is important for stable operation of the transformer.
The traditional pressure relief valve detection table has the defects of large size and heavy weight, is often difficult to carry, and is only suitable for detection in a laboratory. The pressure relief valve has long inspection time, the maintenance plan of the main transformer is seriously influenced, and the power failure time of the main transformer is prolonged.
Disclosure of Invention
In order to solve the problem, the utility model provides a portable transformer pressure relief valve on-spot check-up system, portability to the main transformer maintenance scene carry out the on-spot check-up to pressure relief valve to avoided the time consumption of censorship, shortened the main transformer power off time, reduced the power loss. The specific technical scheme is as follows:
a portable transformer pressure relief valve field calibration system comprises a main control device, a pressure transmitter, a main control device box body and a pressure transmitter box body; the main control device comprises a microprocessor, a touch display screen and an air compressor; the pressure transmitter comprises an air storage tank, a test tank, a first electromagnetic valve, a second electromagnetic valve and a pressure sensor;
the microprocessor is respectively connected with the touch display screen, the air compressor, the first electromagnetic valve, the second electromagnetic valve and the pressure sensor; the air compressor, the air storage tank and the test tank are sequentially connected through a pipeline;
the air compressor is used for compressing air and inputting the compressed air into the air storage tank for storage;
the test tank is used for storing test gas and verifying the pressure release valve;
the second electromagnetic valve is arranged on a pipeline for connecting the gas storage tank with the test tank and is used for controlling the on-off of the gas flow between the gas storage tank and the test tank;
the first electromagnetic valve is arranged on a pipeline connected with the test tank and the pressure release valve to be tested and is used for controlling the on-off of air flow between the test tank and the pressure release valve to be tested;
the pressure sensor is arranged in the test tank and used for detecting pressure data in the test tank and transmitting the detected pressure data to the microprocessor for processing;
the microprocessor is used for controlling the air compressor, the first electromagnetic valve and the second electromagnetic valve to be opened and closed, collecting and processing pressure data detected by the pressure sensor, and displaying the pressure data through the touch display screen;
the touch display screen is used for displaying the pressure data processed by the microprocessor and realizing man-machine interaction;
the main control device is fixed in the main control device box, the pressure transmitter is fixed in the pressure transmitter box, the length, the width and the height of the main control device box and the pressure transmitter box are not more than 50cm, the total weight of the main control device and the main control device box is not more than 15kg, and the total weight of the pressure transmitter and the pressure transmitter box is not more than 25 kg.
Preferably, the first electromagnetic valve is connected with the pressure release valve to be tested through a switching flange plate; the switching flange plate is in threaded connection with an air outlet of a pipeline provided with the first electromagnetic valve, an air outlet hole and a screw hole are formed in the switching flange plate, and the pressure release valve to be tested is fixed on the switching flange plate through the matching of the bolt and the screw hole of the switching flange plate.
Preferably, the device further comprises a voltage conversion module; the voltage conversion module is used for converting the AC220V power supply into the voltage required by the system.
Preferably, the microprocessor comprises an ARM9 type chip.
The principle of the utility model is that: the tester sends the user operation instruction to the microprocessor through the touch display screen, and the microprocessor sends corresponding control instruction to air compressor and first solenoid valve, second solenoid valve after receiving the instruction and tests, controls the switching of air compressor and first solenoid valve, second solenoid valve, and pressure sensor returns the pressure information of the test jar of monitoring in real time simultaneously, and microprocessor returns the touch display screen after carrying out analysis processes to pressure information and demonstrates for the tester.
When normal, the first electromagnetic valve and the second electromagnetic valve are both in a closed state. During the experiment, at first utilize the bolt to be fixed on the switching ring flange by pressure testing release valve, then seal test, opening pressure test and closing pressure test, adopt the utility model discloses carry out experimental step as follows:
(1) sealing test: opening the first electromagnetic valve and the second electromagnetic valve, and pressurizing the pressure release valve, the test tank and the air storage tank by the air compressor until the set pressure is reached
And standing for 2h, and recording the lowest pressure value during the period as the sealing pressure.
(2) Opening pressure test: the second electromagnetic valve is opened, the air compressor pressurizes the test tank,up to the set pressure
And closing the second electromagnetic valve, opening the first electromagnetic valve, enabling high-pressure air in the test tank to impact the pressure release valve instantly, and monitoring the action condition of the pressure release valve. If the pressure relief valve is not actuated, then
Is arranged as
Wherein
Repeat the above experiment for a given larger step up; if the pressure relief valve is actuated, then
Is arranged as
Wherein
Given a smaller step down. When it comes tonThe secondary test pressure relief valve operatesnWhen the pressure relief valve does not act in +1 test, the first test isnAt the time of the next test
To a value of opening pressure
。
(3) Closing the pressure test: in the opening pressure test, after the pressure relief valve acts for the last time, the pressure in the test tank is reduced, and when the pressure is reduced to the lowest value, the pressure is a closing pressure value
。
The utility model has the advantages that: the utility model provides a portable transformer pressure relief valve on-spot check-up system is small, and light in weight can carry and test to the main change maintenance scene, can save a large amount of pressure relief valve censorship time, has shortened the main change power off time, reduces the power loss.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a view of a base of a phi 50mm type pressure relief valve; wherein 11: spring membrane disc 50mm in diameter, 12: the diameter of each screw hole is 12-14mm, and the distance between the centers of 2 adjacent screw holes in the horizontal or vertical direction is 92 mm; 13: a phi 50mm type pressure relief valve base;
FIG. 3 is a view of a 130mm diameter pressure relief valve base; wherein 21: spring membrane disc with diameter 130mm, 22: the diameter is 17-22mm, the distance between the centers of 2 adjacent screw holes along the circumferential direction is 120 mm; 23: a phi 130mm type pressure relief valve base;
FIG. 4 is a schematic structural view of the adapter flange;
wherein 31: the air outlet is circular, the diameter is 4.2cm, and the inner side of the air outlet is provided with threads;
32: phi 50mm type pressure relief valve sealing rubber ring: the device is circular, has the diameter of 11cm, is used for sealing a tested pressure release valve with the oil injection caliber of phi 50mm, is arranged in a sealing rubber ring groove, and is detachable;
33: phi 50mm type pressure release valve fixing screw hole: the diameter of each screw hole is 1cm, the screw holes are arranged in a square mode, the side length is 9.2cm, the distance between each screw hole and a central point is 6.5cm, and the screw holes are used for fixing a measured pressure release valve with the oil injection caliber of phi 50 mm;
34: phi 130mm type pressure relief valve sealing rubber ring: the sealing device is circular, has the diameter of 20cm, is used for sealing a tested pressure release valve with the oil injection caliber of phi 130mm, is arranged in a sealing rubber ring groove, and is detachable;
35: phi 130mm type pressure relief valve fixing screw hole: six screw holes are 1.5cm in diameter, arranged in a regular hexagon, 12cm in side length and 12cm away from a central point, and are used for fixing a measured pressure release valve with the oil injection caliber of phi 130 mm;
36: switching a flange plate: circular, diameter 28cm, thickness 2 cm;
fig. 5 is a flow chart of the opening pressure test of the present invention.
Detailed Description
For a better understanding of the present invention, the following further description is made in conjunction with the accompanying drawings and the specific embodiments:
as shown in fig. 1, a portable transformer pressure relief valve field calibration system comprises a main control device, a pressure transmitter, a main control device box and a pressure transmitter box; the main control device comprises a microprocessor, a touch display screen and an air compressor; the pressure transmitter comprises an air storage tank, a test tank, a first electromagnetic valve, a second electromagnetic valve and a pressure sensor; the first electromagnetic valve and the second electromagnetic valve can adopt HOPE97 type electromagnetic valves; the measurement range of the pressure sensor is preferably 0-150 kPa, the measurement precision is 0.1kPa, and an M3200 series electronic pressure sensor can be adopted. The microprocessor is respectively connected with the touch display screen, the air compressor, the first electromagnetic valve, the second electromagnetic valve and the pressure sensor through control signal lines; the air compressor, the air storage tank, the test tank are connected in sequence through pipelines.
The air compressor is used for compressing air and inputting the compressed air into the air storage tank through the air inlet pipe for storage; the test tank is used for storing test gas and verifying the pressure release valve; the second electromagnetic valve is arranged on the gas transmission pipe between the gas storage tank and the test tank and used for controlling the on-off of the gas flow between the gas storage tank and the test tank; the first electromagnetic valve is arranged on an air outlet pipe between the test tank and the pressure release valve to be tested and used for controlling the on-off of air flow between the test tank and the pressure release valve to be tested; the pressure sensor is arranged in the test tank and used for detecting pressure data in the test tank and transmitting the detected pressure data to the microprocessor for processing; the microprocessor is used for controlling the opening and closing of the air compressor, the first electromagnetic valve and the second electromagnetic valve, collecting and processing pressure data detected by the pressure sensor, and displaying the pressure data through the touch display screen; the touch display screen is used for displaying the pressure data processed by the microprocessor and realizing man-machine interaction.
The main control device is fixed in the main control device box, the pressure transmitter is fixed in the pressure transmitter box, the length, the width and the height of the main control device box and the pressure transmitter box are not more than 50cm, the total weight of the main control device and the main control device box is not more than 15kg, and the total weight of the pressure transmitter and the pressure transmitter box is not more than 25 kg. The main control device box body is provided with a power supply interface, an air outlet and a data signal line interface, and the pressure transmitter box body is provided with an air inlet and a data signal line interface; and a data signal line interface on the main control device box body is connected with a data signal line interface on the pressure transmitter box body through a data signal line, and the microprocessor is used for transmitting corresponding control signals to the first electromagnetic valve and the second electromagnetic valve and collecting detection data of the pressure sensor. An air outlet on the main control device box body is connected with an air inlet on the pressure transmitter box body through a pipeline and used for inputting air into the air storage tank by the air compressor. The connecting line between the main control device box body and the pressure transmitter box body can be disassembled, the two ends of the pipeline connected with the gas outlet and the gas inlet can be provided with joints, and the joints are respectively in threaded connection with the gas outlet and the gas inlet.
The portable transformer pressure relief valve field calibration system also comprises a voltage conversion module; the voltage conversion module is used for converting the AC220V power supply into the voltage required by the system. The microprocessor comprises an ARM9 chip and adopts DC3.3V to supply power; the touch display screen adopts black and white liquid crystal display and adopts DC12V for power supply; the air compressor is powered by AC220V, and can adopt HP-0300C type air compressor with rated power of 150W. The whole system is connected with an AC220V power supply, and supplies power to the microprocessor and the touch display screen after being converted by the voltage conversion module, the power conversion module can adopt a DLA300L type, the input voltage AC220V, the output voltage is selected to be DC12V/3.3V, and the maximum output power is 300W.
The first electromagnetic valve is connected with the pressure release valve to be tested through the adapter flange plate; the air outlet pipe penetrates through the shell, an external thread is arranged on the outer side of the air outlet pipe, an air outlet hole, a screw hole and a sealing rubber ring are arranged on the switching flange plate, an internal thread is arranged on the inner side of the air outlet hole, the external thread of the air outlet pipe is matched with the internal thread of the air outlet hole of the switching flange plate, and the switching flange plate is fixed on the pressure transmitter box and connected with the air. The pressure release valve to be tested is fixed on the adapter flange plate through the matching of the bolt and the screw hole of the adapter flange plate; the caliber of the pressure release valve to be measured is matched with the size of the sealing rubber ring connected with the flange plate, as shown in figures 2-4.
Adopt the utility model discloses a portable pressure release valve on-the-spot check-up system that the patent provided verifies YSF8-55/130 KJBTH type pressure release valve of certain company production. The test was developed according to the relevant regulations of JB/T7065-2015 pressure relief valve for transformers, and the procedure was as follows:
(1) the pressure relief valve was secured to the 130mm port via the corresponding adapter flange using bolts.
(2) And (3) carrying out a sealing test: selecting a model of a selected pressure release valve on the touch display screen to be YSF-55/130, setting the opening pressure to be 55kPa, the caliber to be 130mm and the initial set pressure of a sealing pressure test
Is 38 kPa.
After the test is confirmed to be started, the microprocessor controls the first electromagnetic valve and the second electromagnetic valve to be opened, and the microprocessor controls the air compressor to pressurize the pressure release valve, the test tank and the air storage tank until the set pressure is reached
Standing for 2h, and the pressure values during recording are shown in table 1:
TABLE 1 values of pressure during seal test
| Time/min | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 |
| pressure/kPa | 37.5 | 37.3 | 37.0 | 36.7 | 36.5 | 36.3 | 36.1 | 36.0 | 36.0 | 36.0 | 35.9 | 35.9 |
| Time/min | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 |
| pressure/kPa | 35.9 | 35.9 | 35.9 | 35.9 | 35.9 | 35.8 | 35.8 | 35.8 | 35.8 | 35.8 | 35.8 | 35.8 |
As can be seen from Table 1, the sealing pressure was the lowest pressure value of 35.8kPa during the sealing.
(3) Carrying out an opening pressure test: selecting a pressure release valve on a touch display screen to be YSF-55/130 in type, setting the opening pressure of the system to be 55kPa and the caliber to be 130mm, and setting the initial set pressure of the opening pressure test
At 55kPa, the rise step length
Set to 2kPa, the step size of descent
Set at 0.2kPa and the experimental flow chart is shown in figure 5.
After the test is confirmed to be started, the microprocessor controls to open the second electromagnetic valve, and the microprocessor controls the air compressor to pressurize the test tank until the set pressure is reached
And closing the second electromagnetic valve, opening the first electromagnetic valve, enabling high-pressure air in the test tank to impact the pressure release valve instantly, and monitoring the action condition of the pressure release valve. If the pressure relief valve is not actuated, then
Is arranged as
Repeating the above test; if the pressure relief valve is actuated, then
Is arranged as
. In the test process
And pressure relief valve actuation are shown in table 2.
TABLE 2 opening pressure test procedure
And pressure relief valve actuation
| Number of times of pressurization | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| P set/kPa | 55 | 57 | 56.8 | 56.6 | 56.4 | 56.2 | 56.0 |
| Situation of action | Do not act | Movement of | Movement of | Movement of | Movement of | Movement of | Do not act |
When it comes tonThe secondary test pressure relief valve operatesnWhen the pressure relief valve does not act in +1 test, the first test isnAt the time of the next test
To a value of opening pressure
. Therefore, the opening pressure value of the test is 56.2 kPa.
(4) A closing pressure test was performed: in the pressure opening test, after the pressure release valve was last actuated, the pressure in the test tank was decreased, and the pressure values during the decrease were recorded as shown in table 3.
TABLE 3 shut-off pressure test pressure value recording
| Time/s | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| pressure/kPa | 56.2 | 42.0 | 33.1 | 31.7 | 31.5 | 31.4 | 31.4 | 31.4 | 31.4 | 31.4 | 31.4 |
Closing pressure
The pressure value is reduced to the lowest value of 31.4 kPa.
To sum up, adopt the utility model discloses a portable pressure release valve on-the-spot check-up system that the patent provided carries out the result of verifying to the YSF8-55/130 KJBTH type pressure release valve of a company's production does: sealing pressure 35.8kPa, opening pressure 56.2kPa, closing pressure 31.4 kPa. According to JB/T7065-2015 pressure relief valve for transformers, the sealing pressure, opening pressure and closing pressure must meet the requirements of Table 4.
TABLE 4 pressure relief valve performance requirements (Unit: kPa)
The pressure relief valve is verified as acceptable.
The present invention is not limited to the above-described embodiments, but only to the preferred embodiments of the present invention, and the present invention is not limited thereto, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (4)
1. The utility model provides a portable transformer pressure relief valve on-spot check-up system which characterized in that: the pressure transmitter comprises a main control device, a pressure transmitter, a main control device box body and a pressure transmitter box body; the main control device comprises a microprocessor, a touch display screen and an air compressor; the pressure transmitter comprises an air storage tank, a test tank, a first electromagnetic valve, a second electromagnetic valve and a pressure sensor;
the microprocessor is respectively connected with the touch display screen, the air compressor, the first electromagnetic valve, the second electromagnetic valve and the pressure sensor; the air compressor, the air storage tank and the test tank are sequentially connected through a pipeline;
the air compressor is used for compressing air and inputting the compressed air into the air storage tank for storage;
the test tank is used for storing test gas and verifying the pressure release valve;
the second electromagnetic valve is arranged on a pipeline for connecting the gas storage tank with the test tank and is used for controlling the on-off of the gas flow between the gas storage tank and the test tank;
the first electromagnetic valve is arranged on a pipeline connected with the test tank and the pressure release valve to be tested and is used for controlling the on-off of air flow between the test tank and the pressure release valve to be tested;
the pressure sensor is arranged in the test tank and used for detecting pressure data in the test tank and transmitting the detected pressure data to the microprocessor for processing;
the microprocessor is used for controlling the air compressor, the first electromagnetic valve and the second electromagnetic valve to be opened and closed, collecting and processing pressure data detected by the pressure sensor, and displaying the pressure data through the touch display screen;
the touch display screen is used for displaying the pressure data processed by the microprocessor and realizing man-machine interaction;
the main control device is fixed in the main control device box, the pressure transmitter is fixed in the pressure transmitter box, the length, the width and the height of the main control device box and the pressure transmitter box are not more than 50cm, the total weight of the main control device and the main control device box is not more than 15kg, and the total weight of the pressure transmitter and the pressure transmitter box is not more than 25 kg.
2. The portable transformer pressure relief valve field verification system of claim 1, wherein: the first electromagnetic valve is connected with the pressure release valve to be tested through the adapter flange plate; the switching flange plate is in threaded connection with an air outlet of a pipeline provided with the first electromagnetic valve, an air outlet hole and a screw hole are formed in the switching flange plate, and the pressure release valve to be tested is fixed on the switching flange plate through the matching of the bolt and the screw hole of the switching flange plate.
3. The portable transformer pressure relief valve field verification system of claim 1, wherein: the device also comprises a voltage conversion module; the voltage conversion module is used for converting the AC220V power supply into the voltage required by the system.
4. The portable transformer pressure relief valve field verification system of claim 1, wherein: the microprocessor comprises an ARM9 type chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920917091.3U CN210141986U (en) | 2019-06-18 | 2019-06-18 | Portable transformer pressure relief valve field calibration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920917091.3U CN210141986U (en) | 2019-06-18 | 2019-06-18 | Portable transformer pressure relief valve field calibration system |
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| CN210141986U true CN210141986U (en) | 2020-03-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213096A (en) * | 2020-09-28 | 2021-01-12 | 山东电工电气集团智能电气有限公司 | Pressure testing method suitable for various types of pressure release valves |
-
2019
- 2019-06-18 CN CN201920917091.3U patent/CN210141986U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213096A (en) * | 2020-09-28 | 2021-01-12 | 山东电工电气集团智能电气有限公司 | Pressure testing method suitable for various types of pressure release valves |
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