CN114397105A - Pressure relief valve calibration device and calibration method for oil-immersed transformer - Google Patents
Pressure relief valve calibration device and calibration method for oil-immersed transformer Download PDFInfo
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- CN114397105A CN114397105A CN202111510157.5A CN202111510157A CN114397105A CN 114397105 A CN114397105 A CN 114397105A CN 202111510157 A CN202111510157 A CN 202111510157A CN 114397105 A CN114397105 A CN 114397105A
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Abstract
The invention relates to the technical field of power equipment calibration devices, in particular to a pressure release valve calibration device and a calibration method for an oil-immersed transformer. The volume of the residual space in the test tank is adjusted by the variable-volume mechanism under the driving of the power device, and the pressure of the residual space in the test tank is adjusted by the exhaust valve, so that the variable-volume mechanism is suitable for pressure release valves of different specifications, the check of all check items of one pressure release valve can be completed in one-time installation process, the space occupied by detection equipment is saved, the installation and disassembly times during check are reduced, the check steps are fewer, and the high-efficiency pressure test device is more efficient. The test port of the test tank is provided with the quick-mounting clamp, and the quick-mounting clamp is connected with the to-be-tested pressure release valve more simply and quickly and is simpler and more convenient to operate.
Description
Technical Field
The invention relates to the technical field of power equipment calibration devices, in particular to a pressure release valve calibration device and a calibration method for an oil-immersed transformer.
Background
The pressure release valve is an important device for non-electric quantity protection of the transformer, and the DL/T393 and the 'five-way one measure' of the national grid both put definite requirements on the inspection of the pressure release valve. However, the existing pressure relief valve inspection device cannot completely meet the inspection requirements of the pressure relief valve, and the following problems mainly exist:
1. according to the regulation of JB/T7065-2015 pressure release valve for transformer, pressure release valves with different calibers need to be opened and closed by adopting different test tanks, the volume of the pressure release valve with the effective calibers of phi 25 and phi 50 oil injection is 30L for opening the pressure test tank, and the volume of the pressure test tank for closing is 60L. The volume of the pressure release valve opening pressure test tank with the oil injection effective caliber of phi 80 and phi 130 is 60L, and the volume of the pressure release valve closing pressure test tank is 150L. For a laboratory, 3 test tanks occupy a lot of useful area. The opening pressure and the closing pressure need to be carried out on different test tanks, the opening pressure and the closing pressure need to be checked and verified by one valve respectively in the opening pressure test tank and the closing pressure test tank, the assembling and disassembling times are multiple, the labor intensity is high, and the efficiency is low.
2. Some experimental devices overcome the problems, and a test tank is adopted to test the opening and closing pressure values of all pressure release valves, but the requirements of JB/T7065-2015 pressure release valves for transformers are not met.
3. In order to achieve the pressure increment of 25-40 kPa required by the test, all the conventional test devices are required to be provided with large air compressors, so that the noise and vibration are large, and the normal work of other people in a laboratory is influenced. And the air compressor belongs to special equipment, all needs the inspection every year, increases use cost.
Based on this, it is necessary to develop and design a pressure relief valve calibration device for an oil-immersed transformer.
Disclosure of Invention
The embodiment of the invention provides a pressure release valve checking device and a pressure release valve checking method for an oil-immersed transformer, which are used for solving the problem that the checking operation of the pressure release valve for the oil-immersed transformer in the prior art is complicated.
In a first aspect, an embodiment of the present invention provides a pressure relief valve calibration apparatus for an oil-immersed transformer, including:
the device comprises a power device, a test tank, a variable volume mechanism, an exhaust valve and a quick-mounting clamp;
the variable-capacity mechanism is movably and hermetically connected with the inner space of the test tank, and the power device is used for driving the variable-capacity mechanism so as to change the volume of the residual space in the test tank;
the test tank is provided with a test port and an exhaust port;
the fast-assembling clamp is fixedly arranged at a test port of the test tank and is used for connecting a first port of the pressure release valve with the test port of the test tank;
the exhaust valve is a two-position two-way valve, one end of the exhaust valve is communicated with the exhaust port of the test tank, and the other end of the exhaust valve is communicated with the atmosphere.
In one possible implementation, the test tank is a cylinder, and the variable-volume mechanism includes: a piston and two connecting rods;
the piston is arranged in the test tank and is in sliding sealing connection with the interior of the test tank;
the first end of one of the connecting rods is hinged with the piston, and the second end of the connecting rod is hinged with the first end of the other connecting rod;
and the second end of the other connecting rod is fixedly connected with the output shaft of the power device.
In a possible implementation manner, the pressure relief valve verification apparatus for an oil-immersed transformer further includes: a control unit, the control unit comprising: the system comprises a control module, a volume sensor and a pressure sensor; the exhaust valve is an electromagnetic valve;
the volume sensor, the pressure sensor, the exhaust valve and the power device are respectively electrically connected with the control module;
the pressure sensor is used for acquiring a pressure signal of the residual space of the test tank, and the volume sensor is used for acquiring a volume signal of the residual space of the test tank;
the output shaft of the power device can be locked;
the control module is used for controlling the opening and closing of the exhaust valve according to the pressure signal and controlling the starting and stopping of the power device according to the volume signal.
In a possible implementation manner, the pressure relief valve verification apparatus for an oil-immersed transformer further includes: and the signal collector is electrically connected with the control module and is used for collecting the action signal of the pressure release valve.
In one possible implementation, the volume sensor includes: a permanent magnet and a hall sensor;
the permanent magnet is fixed on the outer peripheral surface of the piston, the Hall sensor is fixedly arranged at a target volume position of the outer wall of the cylinder body, the Hall sensor is used for sensing a magnetic field signal of the permanent magnet to serve as a volume signal, and the Hall sensor is electrically connected with the control module.
In a possible implementation manner, the pressure relief valve verification apparatus for an oil-immersed transformer further includes: an upper computer;
the control module is electrically connected with the upper computer;
the upper computer is used for receiving externally input checking conditions, outputting control signals according to the checking conditions, receiving action signals of the pressure release valve from the control module and judging whether the pressure release valve is qualified or not according to the action signals of the pressure release valve;
and the control module is used for controlling the capacity and the pressure of the residual space of the test tank according to the control signal.
In a possible implementation manner, the power device is a servo motor, a stepping motor or a motor with a worm gear reducer output;
wherein, the motor that has worm gear speed reducer output includes: the output end of the motor is in transmission connection with the input end of the worm gear speed reducer, and the output end of the worm gear speed reducer serves as a power output end.
In a second aspect, an embodiment of the present invention provides a method for verifying a pressure relief valve for an oil-immersed transformer, including:
obtaining the model of a pressure release valve to be verified;
determining the volume of the opening pressure test tank, the volume of the closing pressure test tank, the check pressure and the check standard according to the model;
according to the volume of the opening pressure test tank and the check pressure, opening pressure test is carried out on the pressure release valve by controlling the power device and the exhaust valve;
according to the volume of the closed pressure test tank and the check pressure, performing a closed pressure test on the pressure release valve by controlling the power device and the exhaust valve;
and determining whether the pressure relief valve is qualified or not according to the pressure when the pressure relief valve acts and the inspection standard.
In one possible implementation manner, the pressure relief valve opening pressure test by controlling the power unit and the exhaust valve according to the volume of the opening pressure test tank and the check pressure includes:
opening the exhaust valve;
starting the power device, and adjusting the residual volume of the test tank to the volume of the opening pressure test tank;
closing the exhaust valve;
starting the power device to enable the residual volume of the test tank to be rapidly reduced and the pressure to be increased;
and recording the pressure when the pressure relief valve acts.
In one possible implementation manner, the performing the closing pressure test on the pressure relief valve by controlling the power plant and the exhaust valve according to the volume of the closing pressure test tank and the verification pressure includes:
opening the exhaust valve;
starting the power device, and adjusting the residual volume of the test tank to the volume of the closed pressure test tank;
closing the exhaust valve;
starting the power device to enable the residual volume of the test tank to be rapidly reduced and the pressure to be increased;
and recording the pressure when the pressure relief valve acts.
Compared with the prior art, the implementation mode of the invention has the following beneficial effects:
the embodiment of the invention discloses a pressure release valve calibration device for an oil-immersed transformer. The volume of the residual space in the test tank is adjusted by the variable-volume mechanism under the driving of the power device, and the pressure of the residual space in the test tank is adjusted by the exhaust valve, so that the variable-volume mechanism is suitable for pressure release valves of different specifications, the check of all check items of one pressure release valve can be completed in one-time installation process, the space occupied by detection equipment is saved, the installation and disassembly times during check are reduced, the check steps are fewer, and the high-efficiency pressure test device is more efficient. The test port of the test tank is provided with the quick-mounting clamp, and the quick-mounting clamp is connected with the to-be-tested pressure release valve more simply and quickly and is simpler and more convenient to operate.
In the embodiment of the invention, the volume of the inner space of the test tank is changed by the sliding seal of the piston and the test tank in the shape of a cylinder body, and the piston is driven by the connecting rod mechanism, so the mechanism has simple structure and reliable operation, and does not need secondary power energy forms such as an air pressure source, a hydraulic source and the like, thereby occupying small space, having less investment and having more compact integral equipment structure.
The embodiment of the invention also provides a control unit, the control unit controls the pressure in the test tank according to the signal of the pressure sensor and controls the volume of the residual space in the test tank according to the signal of the volume sensor, so that the process of manual intervention is reduced, and the adjustment is quick, accurate and stable.
The embodiment of the invention also provides a calibration method, when the calibration method is applied to a calibration device comprising a control unit and a mechanical part, automatic calibration can be continuously carried out only by inputting calibration parameters and connecting a pressure release valve to be calibrated, and an experimental result is given, so that the operation is simple and convenient, and the calibration efficiency is high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic diagram of a mechanical part of a pressure relief valve calibration device for an oil-immersed transformer according to an embodiment of the present invention;
fig. 2 is a functional block diagram of a control portion of a pressure relief valve checking device for an oil-immersed transformer according to an embodiment of the present invention.
In the figure:
1, a power device;
2, connecting rods;
3, testing the tank;
4, a piston;
5, exhausting the valve;
6, quickly assembling a clamp;
7 a pressure relief valve;
8, a pressure sensor;
9 volume sensor.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made with reference to the accompanying drawings.
The following is a detailed description of the embodiments of the present invention, which is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Fig. 1 is a mechanical part schematic diagram of a pressure relief valve 7 verification device for an oil-immersed transformer according to an embodiment of the present invention.
As shown in fig. 1, a schematic diagram of a mechanical part of a pressure relief valve 7 verification device for an oil-filled transformer according to an embodiment of the present invention is shown, and detailed below:
a pressure relief valve 7 calibration device for an oil-immersed transformer comprises: the device comprises a power device 1, a test tank 3, a variable volume mechanism, an exhaust valve 5 and a quick-mounting clamp 6.
The variable volume mechanism is movably and hermetically connected with the inner space of the test tank 3, and the power device 1 is used for driving the variable volume mechanism, so that the volume of the residual space in the test tank 3 is changed. The test tank 3 is provided with a test port and an exhaust port, and the quick-assembling clamp 6 is fixedly arranged at the test port of the test tank 3 and used for connecting a first port of the pressure release valve 7 with the test port of the test tank 3. The exhaust valve 5 is a two-position two-way valve, one end of the exhaust valve 5 is communicated with the exhaust port of the test tank 3, and the other end of the exhaust valve 5 is communicated with the atmosphere.
Exemplarily, the embodiment of the invention provides a pressure relief valve 7 verification device for an oil-immersed transformer. The core of the mechanical part is a test tank 3 with adjustable pressure and internal space volume.
The apparatus is provided with a variable volume mechanism for adjusting the volume of the internal space of the test vessel 3 in the internal space of the test vessel 3, and specifically, the internal volume is changed by changing the shape of the internal space of the test vessel 3 by a mechanical device or a fluid device.
The variable volume mechanism is driven by the power device 1 to change the size of the internal space of the filling test tank 3.
As is known, when a gas is constant, the volume of the gas is changed, and the pressure of the gas is changed along with the change of the volume. Therefore, in order to control the pressure in the inner space of the test vessel 3, an exhaust valve 5 is provided. The exhaust valve 5 is a two-position two-way valve for communicating the space inside the test canister 3 with the outside atmosphere, so that the pressure inside the test canister 3 and the pressure of the outside atmosphere tend to coincide.
The quick-assembling clamp 6 is used for quickly installing the pressure relief valve 7 and a test port of the test tank 3.
Specifically, in the embodiment, the power device 1 is matched with the volume-changing mechanism to adjust the volume of the space inside the test tank 3, the volume-changing mechanism can be a piston 4, the volume is changed by the position of the piston 4 in the test tank 3, or a liquid pump is used for injecting liquid into the test tank 3, and the volume in the test tank 3 is changed. The test canister 3 may also be a variable volume bladder of flexible material that changes shape by squeezing or the like, thereby changing its internal volume. Accordingly, the power unit 1 may be in the form of an electric motor, a gasoline engine, a hydraulic cylinder, a pneumatic cylinder, an electric cylinder, etc., and should not be construed as being particularly limited herein.
Those skilled in the art will appreciate that the foregoing examples are provided merely for convenience of understanding and are not intended to be limiting.
According to the embodiment of the invention, the volume of the residual space in the test tank 3 is adjusted by the variable volume mechanism of the pressure release valve 7 under the driving of the power device 1, and the pressure in the residual space in the test tank 3 is adjusted by the exhaust valve 5, so that the pressure release valve 7 can be suitable for pressure release valves 7 of different specifications, all verification items of one pressure release valve 7 can be verified in one installation process, the space occupied by detection equipment is saved, the installation and disassembly times during verification are reduced, the verification steps are fewer, and the efficiency is higher. The test port of the test tank 3 is provided with a quick-mounting clamp 6 which is connected with a to-be-tested pressure release valve 7 more simply and quickly, and the operation is simpler and more convenient.
In a possible way of realisation, the test tank 3 is a cylinder, and the positive-displacement mechanism comprises: a piston 4 and two connecting rods 2.
The piston 4 is arranged inside the test tank 3 and is connected with the inside of the test tank 3 in a sliding and sealing manner. One of the connecting rods 2 is hinged at a first end to the piston 4 and at a second end to a first end of the other connecting rod 2. The second end of the other connecting rod 2 is fixedly connected with the output shaft of the power device 1.
Illustratively, in a preferred calibration device, the test canister 3 is a cylinder, the positive displacement mechanism comprises a piston 4 and two connecting rods 2, the piston 4 is in sliding seal with the inner space of the test canister 3, and the piston 4 stops at different positions of the test canister 3 to change the volume of the effective residual space of the test canister 3.
For the sake of convenience of separation, the two links 2 are referred to as a first link 2 and a second link 2, respectively, in the present embodiment. The first end of the first connecting rod 2 is hinged with the bottom of the piston 4, the second end of the first connecting rod 2 is hinged with the first end of the second connecting rod 2, and the second end of the second connecting rod 2 is fixedly connected with the output shaft of the power device 1.
The power device 1 has various embodiments, such as a hydraulic motor, a starting motor, an electric motor, etc., in this embodiment, the electric motor is an electric motor, an output shaft of the electric motor is fixedly connected with the second end of the second connecting rod 2, and when the output shaft of the electric motor rotates, the second connecting rod 2 and the first connecting rod 2 drive the piston 4 to slide along the inside of the test tank 3, so as to change the volume of the residual space inside the test tank 3.
In the embodiment of the invention, the volume of the internal space of the test tank 3 is changed by the sliding seal of the piston 4 and the test tank 3 in the shape of a cylinder body, and the piston 4 is driven by the connecting rod 2 mechanism, so the mechanism has simple structure and reliable operation, and does not need power energy forms such as an air pressure source, a hydraulic source and the like, thereby the occupied space is small, the investment is less, and the whole equipment structure is more compact.
In a possible implementation manner, the pressure relief valve 7 verification device for an oil-immersed transformer further includes: a control unit, the control unit comprising: a control module, a volume sensor 9 and a pressure sensor 8; the exhaust valve 5 is an electromagnetic valve. The volume sensor 9, the pressure sensor 8, the exhaust valve 5 and the power device 1 are respectively electrically connected with the control module.
The pressure sensor 8 is used for collecting a pressure signal of the residual space of the test tank 3, and the volume sensor 9 is used for collecting a volume signal of the residual space of the test tank 3. The output shaft of the power device 1 can be locked. The control module is used for controlling the opening and closing of the exhaust valve 5 according to the pressure signal and controlling the starting and stopping of the power device 1 according to the volume signal.
In one embodiment, a control unit is provided, which serves the purpose of controlling the power unit 1 and the exhaust valve 5 for automatically controlling the volume of the remaining space inside the test vessel 3.
Specifically, the control unit is provided with a control module, a volume sensor 9, and a pressure sensor 8, the control module being implemented in the form of a PLC, such as a programmable logic controller manufactured by siemens corporation under model number S7-400. In another embodiment, the system is a microcomputer measurement and control system, in particular to an embedded system. The controller controls the volume of the remaining space in the test tank 3 by controlling the start and stop of the power unit 1 by a volume sensor 9, and controls the pressure in the test tank 3 by opening and closing an exhaust valve 5 by a pressure sensor 8.
It should be noted that the output shaft position of the power device 1 can be locked, so as to achieve the purpose of controlling the size of the space in the test canister 3.
In a possible implementation manner, the pressure relief valve 7 verification device for an oil-immersed transformer further includes: and the signal collector is electrically connected with the control module and is used for collecting the action signal of the pressure release valve 7.
Illustratively, the signal collector is used for collecting whether the pressure relief valve 7 acts, and in an application scenario, when the pressure relief valve 7 collected by the signal collector acts, the pressure in the test tank 3 is recorded, so that whether the pressure relief valve 7 is qualified is determined according to the pressure when the pressure relief valve 7 acts.
The pressure relief valve 7 can be implemented in various ways, for example, a normally open switch can be used, and when a contact of the normally open switch is touched, the normally open switch is closed, which means that the pressure relief valve 7 acts.
In one possible implementation, the volume sensor 9 comprises: a permanent magnet and a hall sensor;
the permanent magnet is fixed on the peripheral surface of the piston 4, the Hall sensor is fixedly arranged at a target volume position on the outer wall of the cylinder body, the Hall sensor is used for sensing a magnetic field signal of the permanent magnet to serve as a volume signal, and the Hall sensor is electrically connected with the control module.
Illustratively, the volume sensor 9 is implemented by providing a permanent magnet on the outer peripheral surface of the piston 4, and when the piston 4 moves, if the piston moves to the position of the hall sensor, the magnetic field on the outer peripheral surface of the piston 4 will be sensed by the hall sensor, so that the hall sensor is arranged at the position of the corresponding volume, and the purpose of identifying the corresponding volume can be achieved.
In a possible implementation manner, the pressure relief valve 7 verification device for an oil-immersed transformer further includes: an upper computer; the control module is electrically connected with the upper computer.
The upper computer is used for receiving externally input checking conditions, outputting control signals according to the checking conditions, receiving action signals of the pressure release valve 7 from the control module and judging whether the pressure release valve 7 is qualified or not according to the action signals of the pressure release valve 7. The control module is used for controlling the capacity and the pressure of the residual space of the test tank 3 according to the control signal.
Illustratively, as shown in fig. 2, the host computer is used for setting a verification condition, sending the verification condition to the control module, and the control module executes corresponding control, such as controlling the volume of the remaining space in the test tank 3 and controlling the pressure in the test tank 3.
In a possible implementation, the power device 1 is a servo motor, a stepping motor or a motor with a worm gear reducer output. Wherein, the motor that has worm gear speed reducer output includes: the output end of the motor is in transmission connection with the input end of the worm gear speed reducer, and the output end of the worm gear speed reducer serves as a power output end.
For example, the output shafts in the above embodiments can be locked, and in an application scenario, as shown in fig. 2, a servo motor is used.
In a second aspect, an embodiment of the present invention provides a method for verifying a pressure relief valve 7 for an oil-immersed transformer, including:
obtaining the model of the pressure release valve 7 to be verified;
according to the model, determining the volume of the opening pressure test tank 3, the volume of the closing pressure test tank 3, the check pressure and the check standard;
according to the volume of the opening pressure test tank 3 and the check pressure, opening pressure test is carried out on the pressure relief valve 7 by controlling the power device 1 and the exhaust valve 5;
performing a closing pressure test on the pressure relief valve 7 by controlling the power device 1 and the exhaust valve 5 according to the volume of the closing pressure test tank 3 and the check pressure;
and determining whether the pressure relief valve 7 is qualified or not according to the pressure when the pressure relief valve 7 acts and the inspection standard.
In one possible implementation manner, the pressure relief valve 7 is subjected to an opening pressure test by controlling the power unit 1 and the exhaust valve 5 according to the volume of the opening pressure test tank 3 and the check pressure, and the pressure relief valve 7 includes:
opening the exhaust valve 5;
starting the power device 1, and adjusting the residual volume of the test tank 3 to the volume of the opening pressure test tank 3;
closing the exhaust valve 5;
starting the power device 1 to rapidly reduce the residual volume of the test tank 3 and increase the pressure;
the pressure at which the pressure relief valve 7 is actuated is recorded.
In one possible implementation manner, the performing of the closing pressure test on the pressure relief valve 7 by controlling the power plant 1 and the exhaust valve 5 according to the volume of the closing pressure test tank 3 and the check pressure includes:
opening the exhaust valve 5;
starting the power device 1, and adjusting the residual volume of the test tank 3 to the volume of the closed pressure test tank 3;
closing the exhaust valve 5;
starting the power device 1 to rapidly reduce the residual volume of the test tank 3 and increase the pressure;
the pressure at which the pressure relief valve 7 is actuated is recorded.
In one application scenario, the process of checking the pressure relief valve 7 is as follows, for example:
and (3) checking preparation: and (3) checking that the appearance of the pressure release valve 7 meets the requirements, fixing the pressure release valve 7 on the mounting flange of the test tank 3 by using the quick-assembling clamp 6 through the fastening piece, and connecting a signal collector.
Adjusting the volume of the test tank 3: taking the pressure relief valve 7 for checking the effective caliber of 130 phi oil injection as an example, the volume of the opening pressure test tank 3 should be 60L, and the volume of the closing pressure test tank 3 should be 150L. After the parameters of the pressure release valve 7 to be calibrated are input into the computer, the microcomputer measurement and control system determines that the volume of the test tank 3 required by the pressure test is 60L according to the effective oil injection caliber of the pressure release valve 7 and the requirements of JB/T7065-2015 pressure release valve 7 for the transformer, opens the exhaust electromagnetic valve, and starts the servo motor to drive the connecting rod 2 and the piston 4 to move. When the test tank 3 is moved to the standard position of the opening pressure test, the corresponding position sensor sends out a signal, and the servo motor stops.
Opening pressure test: after the position adjustment is finished, the exhaust electromagnetic valve is closed, the servo motor runs fast to drive the piston 4 to compress the gas in the test tank 3, 25-40 kPa pressure increment is generated, the microcomputer measurement and control system monitors pressure change and action signals through the pressure sensor 8 in real time, and the pressure at the opening moment of the membrane disc of the pressure release valve 7 is the opening pressure value of the pressure release valve 7. Meanwhile, the signal collector determines whether the signal switch normally acts according to whether the action signal is collected or not, and the exhaust electromagnetic valve is opened to balance the internal pressure and the external pressure of the test tank 3.
Closing the pressure test: after the opening pressure is checked, the servo motor drives the connecting rod 2 and the piston 4 to move to a standard position of 150L in the closing pressure test, the corresponding position sensor sends out a signal, the servo motor stops, and the exhaust electromagnetic valve is closed. Then the servo motor operates rapidly to drive the piston 4 to compress the gas in the test tank 3 to generate 25-40 kPa pressure increment, the microcomputer measurement and control system monitors pressure change and action signals in real time through the pressure sensor 8, the servo motor stops operating after the pressure release valve 7 is opened, the pressure release valve 7 is closed, the lowest pressure value monitored when the pressure release valve 7 is closed is the closing pressure value of the pressure release valve 7, and the exhaust electromagnetic valve is opened to balance the pressure inside and outside the test tank 3.
And (4) finishing the inspection: after the pressure relief valve 7 is inspected, the microcomputer measurement and control system automatically judges whether the pressure relief valve 7 is qualified or not according to the acquired data and standards, a judgment result is given, and an operator places the inspected pressure relief valve 7 in a subarea mode according to the result.
As will be known by those skilled in the art, the microcomputer measurement and control system automatically judges whether the pressure relief valve 7 is qualified or not according to the collected data and standards, and gives a judgment result, and in the opening pressure test, judges whether the pressure corresponding to the opening of the pressure relief valve 7 is qualified or not; in the closing pressure test, it is determined whether or not the pressure corresponding to the closing of the pressure relief valve 7 is acceptable.
The opening pressure and closing pressure check sequence of the pressure relief valve 7 can be arbitrarily selected.
The other pressure relief valves 7 with the effective oil injection caliber are verified to be the same as the pressure relief valves 7 with the effective oil injection caliber of phi 130.
It should be understood that the sequence numbers of the steps in the above embodiments do not mean the execution sequence, and the execution sequence of each process should be determined by the function and the inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides an oily pressure release valve calibration equipment for transformer which characterized in that includes: the device comprises a power device (1), a test tank (3), a variable volume mechanism, an exhaust valve (5) and a quick clamp (6);
the variable-capacity mechanism is movably and hermetically connected with the inner space of the test tank (3), and the power device (1) is used for driving the variable-capacity mechanism so as to change the volume of the residual space in the test tank (3);
the test tank (3) is provided with a test port and an exhaust port;
the quick-assembling clamp (6) is fixedly arranged at a test port of the test tank (3) and is used for connecting a first port of the pressure release valve (7) with the test port of the test tank (3);
one end of the exhaust valve (5) is communicated with an exhaust port of the test tank (3), and the other end of the exhaust valve (5) is communicated with the atmosphere.
2. The pressure relief valve verification device for an oil filled transformer according to claim 1, wherein the test tank (3) is a cylinder body, and the variable-capacity mechanism comprises: the piston, the first connecting rod and the second connecting rod;
the piston (4) is arranged inside the test tank (3) and is connected with the inside of the test tank (3) in a sliding and sealing manner;
the first end of the first connecting rod is hinged with the piston (4), and the second end of the first connecting rod is hinged with the first end of the second connecting rod;
and the second end of the second connecting rod is fixedly connected with an output shaft of the power device (1).
3. The pressure relief valve verification device for an oil-filled transformer according to claim 2, further comprising: a control unit, the control unit comprising: a control module, a volume sensor (9) and a pressure sensor (8); the exhaust valve (5) is an electromagnetic valve;
the volume sensor (9), the pressure sensor (8), the exhaust valve (5) and the power device (1) are electrically connected with the control module respectively;
the pressure sensor (8) is used for acquiring a pressure signal of the residual space of the test tank (3), and the volume sensor (9) is used for acquiring a volume signal of the residual space of the test tank (3);
the position of an output shaft of the power device (1) can be locked;
the control module is used for controlling the opening and closing of the exhaust valve (5) according to the pressure signal and controlling the starting and stopping of the power device (1) according to the volume signal.
4. The pressure relief valve verification device for an oil-filled transformer according to claim 3, further comprising: and the signal collector is electrically connected with the control module and is used for collecting the action signal of the pressure release valve (7).
5. Pressure relief valve verification device for an oil filled transformer according to claim 3, characterized in that the volume sensor (9) comprises: a permanent magnet and a hall sensor;
the permanent magnet is fixed on the peripheral surface of the piston (4), the Hall sensor is fixedly arranged at a target volume position on the outer wall of the cylinder body, the Hall sensor is used for sensing a magnetic field signal of the permanent magnet to serve as a volume signal, and the Hall sensor is electrically connected with the control module.
6. The pressure relief valve verification device for an oil-filled transformer according to claim 4, further comprising: an upper computer;
the control module is electrically connected with the upper computer;
the upper computer is used for receiving externally input verification conditions, outputting control signals according to the verification conditions, receiving action signals of the pressure release valve (7) from the control module and judging whether the pressure release valve (7) is qualified or not according to the action signals of the pressure release valve (7);
the control module is used for controlling the capacity and the pressure of the residual space of the test tank (3) according to the control signal.
7. The pressure relief valve checking device for the oil-immersed transformer according to any one of claims 1-6, wherein the power device (1) is a servo motor, a stepping motor or a motor with a worm gear reducer output;
wherein, the motor that has worm gear speed reducer output includes: the output end of the motor is in transmission connection with the input end of the worm gear speed reducer, and the output end of the worm gear speed reducer serves as a power output end.
8. A pressure relief valve verification method for an oil-immersed transformer is applied to the pressure relief valve verification device for the oil-immersed transformer according to claim 6 or 7, and comprises the following steps:
obtaining the model of a pressure release valve (7) to be verified;
according to the model, determining the volume of the opening pressure test tank (3), the volume of the closing pressure test tank (3), the check pressure and the check standard;
according to the volume of the opening pressure test tank (3) and the check pressure, performing an opening pressure test on the pressure relief valve (7) by controlling the power device (1) and the exhaust valve (5);
performing a closing pressure test on the pressure relief valve (7) by controlling the power device (1) and the exhaust valve (5) according to the volume of the closing pressure test tank (3) and the check pressure;
and determining whether the pressure relief valve (7) is qualified or not according to the pressure when the pressure relief valve (7) acts and the inspection standard.
9. The method for verifying the pressure relief valve for an oil filled transformer according to claim 8, wherein the pressure relief valve (7) is subjected to an opening pressure test by controlling the power unit (1) and the exhaust valve (5) according to the volume of the opening pressure test tank (3) and the verification pressure, and the method comprises the following steps:
-opening the exhaust valve (5);
starting the power device (1) to adjust the residual volume of the test tank (3) to the volume of the opening pressure test tank (3);
-closing the exhaust valve (5);
starting the power device (1) to enable the residual volume of the test tank (3) to be rapidly reduced and the pressure to be increased;
and recording the pressure when the pressure relief valve (7) acts.
10. The method for verifying the pressure relief valve for an oil filled transformer according to claim 8, wherein the pressure relief valve (7) is subjected to a closing pressure test by controlling the power plant (1) and the exhaust valve (5) according to the volume of the closing pressure test tank (3) and the verification pressure, and the method comprises:
-opening the exhaust valve (5);
starting the power device (1) to adjust the residual volume of the test tank (3) to the volume of the closed pressure test tank (3);
-closing the exhaust valve (5);
starting the power device (1) to enable the residual volume of the test tank (3) to be rapidly reduced and the pressure to be increased;
and recording the pressure when the pressure relief valve (7) acts.
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