CN111189596A - Gas relay sealing performance testing device and testing method - Google Patents
Gas relay sealing performance testing device and testing method Download PDFInfo
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- CN111189596A CN111189596A CN202010164321.0A CN202010164321A CN111189596A CN 111189596 A CN111189596 A CN 111189596A CN 202010164321 A CN202010164321 A CN 202010164321A CN 111189596 A CN111189596 A CN 111189596A
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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Abstract
The invention relates to a gas relay sealing performance testing device and a testing method, wherein the gas relay sealing performance testing device comprises a liquid storage tank and a clamping mechanism, the liquid storage tank is used for containing a liquid testing medium, the upper part of the liquid storage tank is connected with a pressurizing device through an air inlet pipe, the air inlet pipe is provided with a first electromagnetic valve, the liquid storage tank is provided with a pressure sensor and a second electromagnetic valve, and the second electromagnetic valve is used for controlling connection and disconnection with the outside; the clamping mechanism comprises a clamping fixed end and a clamping movable end and is used for clamping two sides of the gas relay and realizing communication, the clamping fixed end is communicated with the liquid storage tank through a connecting pipe, a third electromagnetic valve is arranged on the connecting pipe I, the clamping movable end is connected with a vacuum pump through a connecting pipe II, and a fourth electromagnetic valve, a vacuum sensor and a fifth electromagnetic valve are arranged on the connecting pipe II. The gas relay sealing performance test device can give consideration to the sealing performance test of the floating ball type and baffle type gas relays, and is safe and reliable.
Description
Technical Field
The invention relates to the technical field of gas relay tests, in particular to a gas relay sealing performance test device and a test method.
Background
The gas relay is widely applied to oil-immersed power equipment of a power system, is a main non-electric quantity protection device of the oil-immersed power equipment, and the performance of the gas relay is directly related to the safe operation of the oil-immersed power equipment.
The oil-immersed transformer is the most widely used transformer in domestic power systems at present and is one of the most important devices in a power supply system, the power supply system carries out multiple protection on the transformer for ensuring the safe operation of the transformer, and a gas relay is a main protection element for internal faults of the oil-immersed transformer. When the transformer is in fault, the oil is decomposed to generate gas or oil flow surging, and then the contact of the gas relay acts to connect a designated control loop and send a signal in time or automatically cut off the transformer. The gas relay is also called as a gas relay.
The gas relay is divided into a baffle type and a double-floating-ball type according to the action principle, and in recent years, the proportion of the double-floating-ball type gas relay used in a power system is higher and higher. According to the standard of the power industry, the heavy gas flow velocity value, the light gas volume value and the sealing performance of the gas relay need to be tested. The test method and the test equipment for the heavy gas flow velocity value and the light gas volume value of the gas relay are mature, the sealing performance test usually adopts a gas pump and a liquid pump to pressurize the gas relay to test the sealing performance, the above method is a method for realizing the sealing performance of the baffle type gas relay, and the test requirements of the double-floating-ball type gas relay cannot be met. Because the floating ball in the gas relay has the defects of micro cracks or hidden cracks and the like, the test time is limited by the pressurization test mode, and the floating ball is difficult to detect.
Disclosure of Invention
The invention aims to provide a gas relay sealing performance test device which is suitable for a floating ball type gas relay sealing performance test. Meanwhile, the invention also provides a method for testing the sealing performance of the gas relay.
In order to achieve the purpose, the invention adopts the following technical scheme:
the gas relay sealing performance testing device comprises a liquid storage tank and a clamping mechanism, wherein the liquid storage tank is used for containing a liquid test medium, the upper part of the liquid storage tank is connected with a pressurizing device through an air inlet pipe, a first electromagnetic valve is arranged on the air inlet pipe, a pressure sensor and a second electromagnetic valve are arranged on the liquid storage tank, the pressure sensor is used for detecting the pressure above the liquid test medium in the liquid storage tank, and the second electromagnetic valve is used for controlling the on-off with the outside;
the clamping mechanism comprises a clamping fixed end and a clamping movable end and is used for clamping two sides of a gas relay and realizing communication, the clamping fixed end is communicated with a liquid storage tank through a connecting pipe, a third electromagnetic valve is arranged on the connecting pipe I, the clamping movable end is connected with a vacuum pump through a connecting pipe II, a fourth electromagnetic valve, a vacuum sensor and a fifth electromagnetic valve are arranged on the connecting pipe II, and the fourth electromagnetic valve, the vacuum sensor and the fifth electromagnetic valve are sequentially arranged in the direction from the clamping movable end to the vacuum pump.
Further, the liquid test medium is transformer oil or kerosene.
Further, the connecting pipe is connected to the bottom of the liquid storage tank.
Further, the liquid storage tank is provided with a heater and a temperature sensor, the heater is used for heating the liquid test medium, and the temperature sensor is used for detecting the temperature of the liquid test medium.
Furthermore, the first connecting pipe and the second connecting pipe are both made of hard and oil-resistant materials.
Furthermore, the pressurizing device adopts an air compressor, and a pressure output interface of the air compressor is provided with a pressure regulating valve.
The test method for the sealing performance of the gas relay comprises the following steps,
(1) clamping the gas relay in the clamping mechanism;
(2) the temperature sensor collects temperature signals and transmits the temperature signals to the control system, if the temperature of the test medium does not meet the test temperature condition, the heater is started to heat, the heating is stopped when the temperature reaches the set test temperature, and the temperature sensor collects the temperature signals of the test medium in real time in the process; if the medium temperature meets the test temperature condition, the step is not executed;
(3) vacuumizing the gas relay and a connecting pipe II connected between the gas relay and the vacuum pump by using the vacuum pump to reach a set test vacuum degree and a set holding time, and stopping vacuumizing;
(4) opening a second electromagnetic valve on the liquid storage tank to communicate with the outside, opening a third electromagnetic valve connected between the liquid storage tank and the clamping mechanism, sucking part of liquid test medium in the liquid storage tank into a gas relay cavity until the vacuum degree reaches a set condition, and then closing the second electromagnetic valve and a fourth electromagnetic valve;
(5) opening a first electromagnetic valve on the air inlet pipe, starting a pressurizing device, pressing a liquid test medium into a gas relay through compressed gas, and acquiring a pressure signal in a liquid storage tank in real time by a pressure sensor in the process and transmitting the pressure signal to a control system;
(6) when the pressure transmitted by the pressure sensor reaches a set test pressure value, the control system starts timing, the timing is finished when the set test time is reached, and whether the gas relay meets the industry standard judgment requirement after the test is observed;
(7) and closing the first electromagnetic valve, opening the second electromagnetic valve, releasing the pressure in the liquid storage tank, dismantling the gas relay, and finishing the test.
Further, in the step (5), in the process that the liquid test medium is pressed into the gas relay, the gas relay exhaust nozzle is opened to exhaust gas in the cavity.
Furthermore, the pressurizing device adopts an air compressor, a pressure output interface of the air compressor is provided with a pressure regulating valve, and the pressure regulating valve is used for outputting the set test pressure.
The invention has the beneficial effects that:
the gas relay sealing performance test device and the test method are suitable for the sealing performance test of the floating ball type gas relay, can improve the fault detection rate to a certain extent, and are safe, reliable and high in automation degree. But also suitable for the sealing performance test of the baffle type gas relay. A new testing device and a testing method are provided, and some problems existing in the testing mode in the prior art are solved.
Drawings
Fig. 1 is a schematic structural diagram of a gas relay sealing performance testing apparatus according to the present invention.
Names corresponding to the marks in the figure:
1. the air compressor comprises an air compressor, 2, a pressure regulating valve, 3, a first electromagnetic valve, 4, a liquid storage tank, 5, a second electromagnetic valve, 6, a pressure sensor, 7, a heater, 8, a temperature sensor, 9, a third electromagnetic valve, 10, a gas relay, 11, a vacuum sensor, 12, a fourth electromagnetic valve, 13, a vacuum pump, 14, a fifth electromagnetic valve, 15, a clamping fixed end, 16 and a clamping movable end.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The embodiment of the gas relay sealing performance testing device of the invention comprises the following steps:
as shown in figure 1, the gas relay sealing performance testing device comprises a liquid storage tank 4 and a clamping mechanism, wherein the liquid storage tank 4 is used for containing liquid testing media. The liquid test medium is transformer oil or kerosene.
The upper part of the liquid storage tank 4 is connected with a pressurizing device through an air inlet pipe, and a first electromagnetic valve 3 is arranged on the air inlet pipe. The pressurizing device adopts an air compressor 1, and a pressure output interface of the air compressor is provided with a pressure regulating valve 2 for regulating the pressure of output compressed gas.
And a pressure sensor 6 and a second electromagnetic valve 5 are arranged on the liquid storage tank 4, and the pressure sensor 6 is used for detecting the pressure above the liquid test medium in the liquid storage tank. The second electromagnetic valve 5 is used for controlling the on-off of the air and the outside air, and air inlet or pressure relief can be achieved.
The liquid storage tank is provided with a heater 7 and a temperature sensor 88, the heater 7 is used for heating the liquid test medium, and the temperature sensor 8 is used for detecting the temperature of the liquid test medium.
The clamping mechanism comprises a clamping fixed end 15 and a clamping movable end 16, and is used for clamping two sides of the gas relay 10 and realizing communication. The clamping fixed end is communicated with the liquid storage tank 4 through a first connecting pipe, the first connecting pipe is connected to the bottom of the liquid storage tank 4, namely the position close to the lower part, and a third electromagnetic valve 9 is arranged on the first connecting pipe.
The clamping movable end 16 is connected with a vacuum pump 13 through a second connecting pipe, a fourth electromagnetic valve 12, a vacuum sensor 11 and a fifth electromagnetic valve 14 are arranged on the second connecting pipe, and the fourth electromagnetic valve 12, the vacuum sensor 11 and the fifth electromagnetic valve 14 are sequentially arranged in the direction from the clamping movable end 16 to the vacuum pump 13.
The first connecting pipe and the second connecting pipe are both made of hard and oil-resistant materials.
The structure and principle of the clamping mechanism are not the innovation points of the invention, such as the clamping mechanism on the gas relay checking table provided by the prior patent with the publication number of CN 200944380. Of course, the clamping device is not limited to the above, and other existing clamping mechanisms can be adopted, and the clamping device can be used manually or automatically.
The embodiment of the gas relay sealing performance test method adopts the gas relay sealing performance test device, the gas relay takes a double-floating-ball type gas relay as an example, and the test method comprises the following steps.
(1) The gas relay 10 is clamped in the clamping mechanism, and the clamping fixed end and the clamping movable end of the clamping mechanism are respectively clamped at two ends of the gas relay, so that the gas relay is firmly fixed; rubber sealing gaskets are arranged at two ends of the gas relay 10, the clamping fixed end and the clamping movable end, and the sealing performance of the contact position is guaranteed.
(2) The temperature sensor 8 collects temperature signals and transmits the temperature signals to the control system, if the temperature of the test medium does not meet the test temperature condition, the heater 7 is started to heat, the heating is stopped when the temperature reaches the set test temperature, and the temperature sensor 8 collects the temperature signals of the test medium in real time in the process; if the medium temperature meets the test temperature condition, the step is not executed.
(3) The third electromagnetic valve 9 is closed, the fourth electromagnetic valve 12 and the fifth electromagnetic valve 14 are opened, the vacuum pump 13 is started, the gas relay 10 and the second connecting pipe connected between the gas relay 10 and the vacuum pump 13 are vacuumized, the vacuum sensor 11 collects vacuum degree signals in real time in the process and transmits the vacuum degree signals to the control system, the set test vacuum degree and the holding time are reached, vacuumizing is stopped, and the fifth electromagnetic valve 14 is closed.
(4) The second electromagnetic valve 5 on the liquid storage tank is opened to communicate with the outside, the third electromagnetic valve 9 connected between the liquid storage tank and the clamping mechanism is opened, part of liquid test medium in the liquid storage tank 4 is sucked into the cavity of the gas relay 10 until the vacuum degree reaches a set condition (close to 0), and then the second electromagnetic valve 5 and the fourth electromagnetic valve 12 are closed.
(5) The air inlet pipe is opened, the first electromagnetic valve 3 on the air inlet pipe is opened, the air compressor 1 is started, the pressure regulating valve 2 of the pressure output interface of the air compressor outputs set test pressure, the liquid test medium is pressed into the gas relay 10 through compressed gas, and meanwhile, the gas relay exhaust nozzle is opened to discharge gas in the cavity. In the process, the pressure sensor 6 collects the pressure signal in the liquid storage tank in real time and transmits the pressure signal to the control system.
(6) And when the pressure transmitted by the pressure sensor 6 reaches a set test pressure value, the control system starts timing, finishes timing after the set test time is reached, and observes whether the gas relay meets the industry standard judgment requirement after the test.
(7) And closing the air compressor 1, closing the first electromagnetic valve 3, opening the second electromagnetic valve 5, releasing the pressure in the liquid storage tank, dismantling the gas relay 10 and finishing the test.
In this embodiment, signals collected by the pressure sensor, the temperature sensor, and the vacuum sensor are all transmitted to a controller in the control system, and the controller processes the signals and gives instructions for controlling the actions of the corresponding electrical elements, such as controlling the on/off actions of the electromagnetic valves, the start/stop of the heater, the air compressor, and the vacuum pump, and adjusting parameters of the pressure regulating valve. This part of the control principle can be realized by the prior art means, and is realized by the program, and is not the innovation point of the invention.
The characteristics of the gas relay sealing performance test apparatus and method of the present invention are explained as follows.
If the floating ball in the gas relay to be tested has the defects of micro cracks or recessive cracks and the like, the interior of the gas relay can be vacuumized, and the interior of the floating ball can also be vacuumized. In the processes of the steps (4) and (5), the liquid test medium can enter the floating ball relatively easily, and then in the step (6), whether the floating ball is in fault can be judged by observing whether the floating condition of the floating ball is influenced. For the fault judgment of the gas relay part except the floating ball, whether a seepage point exists is judged in a mode similar to the observation after pressurization in the prior art. Therefore, the gas relay sealing performance test device and the method are also suitable for the baffle type gas relay sealing performance test.
In this embodiment, pressure device adopts air compressor, utilizes compressed gas's pressure to impress the test medium inside the gas relay, for the adoption liquid pump pressurization mode among the prior art, can provide stable pressure better, because the oil medium is difficult to keep the pressurization state for a long time.
In other embodiments, also can additionally set up a heating jar body, place test medium, when needing, can carry the test medium of settlement temperature to the liquid reserve tank, satisfy experimental needs.
In other embodiments, an air tank with a constant pressure may be used in combination with a pressure regulating valve instead of the air compressor.
In other embodiments, an automatic control valve such as a pneumatic valve may be adopted to achieve the on-off function of the electromagnetic valve in each embodiment, which belongs to the conventional replacement of the technical means in the field.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.
Claims (9)
1. Gas relay sealing performance test device, its characterized in that: the device comprises a liquid storage tank and a clamping mechanism, wherein the liquid storage tank is used for containing a liquid test medium, the upper part of the liquid storage tank is connected with a pressurizing device through an air inlet pipe, the air inlet pipe is provided with a first electromagnetic valve, the liquid storage tank is provided with a pressure sensor and a second electromagnetic valve, the pressure sensor is used for detecting the pressure above the liquid test medium in the liquid storage tank, and the second electromagnetic valve is used for controlling the connection and disconnection with the outside;
the clamping mechanism comprises a clamping fixed end and a clamping movable end and is used for clamping two sides of a gas relay and realizing communication, the clamping fixed end is communicated with a liquid storage tank through a connecting pipe, a third electromagnetic valve is arranged on the connecting pipe I, the clamping movable end is connected with a vacuum pump through a connecting pipe II, a fourth electromagnetic valve, a vacuum sensor and a fifth electromagnetic valve are arranged on the connecting pipe II, and the fourth electromagnetic valve, the vacuum sensor and the fifth electromagnetic valve are sequentially arranged in the direction from the clamping movable end to the vacuum pump.
2. The gas relay sealing performance test apparatus according to claim 1, characterized in that: the liquid test medium is transformer oil or kerosene.
3. The gas relay sealing performance test apparatus according to claim 1, characterized in that: the connecting pipe is connected to the bottom of the liquid storage tank.
4. The gas relay sealing performance test apparatus according to claim 1, characterized in that: the liquid storage tank is provided with a heater and a temperature sensor, the heater is used for heating the liquid test medium, and the temperature sensor is used for detecting the temperature of the liquid test medium.
5. The gas relay sealing performance test apparatus according to any one of claims 1 to 4, characterized in that: the first connecting pipe and the second connecting pipe are both made of hard and oil-resistant materials.
6. The gas relay sealing performance test apparatus according to any one of claims 1 to 4, characterized in that: the pressurizing device adopts an air compressor, and a pressure output interface of the air compressor is provided with a pressure regulating valve.
7. The test method for the sealing performance of the gas relay is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
(1) clamping the gas relay in the clamping mechanism;
(2) the temperature sensor collects temperature signals and transmits the temperature signals to the control system, if the temperature of the test medium does not meet the test temperature condition, the heater is started to heat, the heating is stopped when the temperature reaches the set test temperature, and the temperature sensor collects the temperature signals of the test medium in real time in the process; if the medium temperature meets the test temperature condition, the step is not executed;
(3) vacuumizing the gas relay and a connecting pipe II connected between the gas relay and the vacuum pump by using the vacuum pump to reach a set test vacuum degree and a set holding time, and stopping vacuumizing;
(4) opening a second electromagnetic valve on the liquid storage tank to communicate with the outside, opening a third electromagnetic valve connected between the liquid storage tank and the clamping mechanism, sucking part of liquid test medium in the liquid storage tank into a gas relay cavity until the vacuum degree reaches a set condition, and then closing the second electromagnetic valve and a fourth electromagnetic valve;
(5) opening a first electromagnetic valve on the air inlet pipe, starting a pressurizing device, pressing a liquid test medium into a gas relay through compressed gas, and acquiring a pressure signal in a liquid storage tank in real time by a pressure sensor in the process and transmitting the pressure signal to a control system;
(6) when the pressure transmitted by the pressure sensor reaches a set test pressure value, the control system starts timing, the timing is finished when the set test time is reached, and whether the gas relay meets the industry standard judgment requirement after the test is observed;
(7) and closing the first electromagnetic valve, opening the second electromagnetic valve, releasing the pressure in the liquid storage tank, dismantling the gas relay, and finishing the test.
8. The gas relay sealing performance test method according to claim 7, characterized in that: and (5) opening an exhaust nozzle of the gas relay to exhaust gas in the cavity in the process of pressing the liquid test medium into the gas relay.
9. The gas relay sealing performance test method according to claim 7, characterized in that: the pressurizing device adopts an air compressor, a pressure output interface of the air compressor is provided with a pressure regulating valve, and the pressure regulating valve is used for outputting set test pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010164321.0A CN111189596A (en) | 2020-03-11 | 2020-03-11 | Gas relay sealing performance testing device and testing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010164321.0A CN111189596A (en) | 2020-03-11 | 2020-03-11 | Gas relay sealing performance testing device and testing method |
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| CN111189596A true CN111189596A (en) | 2020-05-22 |
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| CN202010164321.0A Pending CN111189596A (en) | 2020-03-11 | 2020-03-11 | Gas relay sealing performance testing device and testing method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111537162A (en) * | 2020-06-17 | 2020-08-14 | 郑州佛光发电设备有限公司 | System and method for detecting tightness of fuel cell |
| CN112146814A (en) * | 2020-09-25 | 2020-12-29 | 国网安徽省电力有限公司电力科学研究院 | Gas relay sealing performance test device |
| CN112985788A (en) * | 2021-02-01 | 2021-06-18 | 中山凯旋真空科技股份有限公司 | Testing device for power equipment |
| CN114112236A (en) * | 2021-11-18 | 2022-03-01 | 新乡航空工业(集团)有限公司 | Exhaust test device and system |
-
2020
- 2020-03-11 CN CN202010164321.0A patent/CN111189596A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111537162A (en) * | 2020-06-17 | 2020-08-14 | 郑州佛光发电设备有限公司 | System and method for detecting tightness of fuel cell |
| CN112146814A (en) * | 2020-09-25 | 2020-12-29 | 国网安徽省电力有限公司电力科学研究院 | Gas relay sealing performance test device |
| CN112985788A (en) * | 2021-02-01 | 2021-06-18 | 中山凯旋真空科技股份有限公司 | Testing device for power equipment |
| CN114112236A (en) * | 2021-11-18 | 2022-03-01 | 新乡航空工业(集团)有限公司 | Exhaust test device and system |
| CN114112236B (en) * | 2021-11-18 | 2023-09-12 | 新乡航空工业(集团)有限公司 | Exhaust test device and system |
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