CN116525256A - Device and system for protecting transformer inside from over-high oil pressure release - Google Patents
Device and system for protecting transformer inside from over-high oil pressure release Download PDFInfo
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- CN116525256A CN116525256A CN202310743189.2A CN202310743189A CN116525256A CN 116525256 A CN116525256 A CN 116525256A CN 202310743189 A CN202310743189 A CN 202310743189A CN 116525256 A CN116525256 A CN 116525256A
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- 238000001514 detection method Methods 0.000 claims abstract description 44
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- 238000009434 installation Methods 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 description 16
- 230000000007 visual effect Effects 0.000 description 7
- 239000012528 membrane Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
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- 230000002829 reductive effect Effects 0.000 description 2
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- 229910000838 Al alloy Inorganic materials 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
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- 239000002775 capsule Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
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- 229920000647 polyepoxide Polymers 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
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Abstract
The invention provides a device and a system for protecting release of excessive oil pressure in a transformer, and belongs to the technical field of power transformers. The device comprises a two-stage pressure release valve module which is arranged at the installation position of an original pressure release valve of a transformer, wherein the two-stage pressure release valve module is obtained by connecting two pressure release valves with completely consistent model parameters in series, one end of the two-stage pressure release valve module is connected with a pressure release outlet of the transformer, and the other end of the two-stage pressure release valve module is connected with an oil guide pipe; the system also comprises a detection control module; when the transformer normally operates, any one pressure release valve in the two-stage pressure release valve module is subjected to a pressurization test, the other pressure release valve keeps working normally, the states of the two pressure release valves are determined after the two pressure release valves are subjected to multiple tests, and the detection control module controls the oil guide pipe and the charging port to be normally opened and closed. According to the invention, the two-stage pressure release valve is arranged, so that the state of the pressure release valve can be determined through the test in the running process of the transformer, and the problem of refusal in long-term non-test is avoided.
Description
Technical Field
The invention belongs to the technical field of operation and maintenance of power transformers, and particularly relates to a device and a system for protecting the release of excessive oil pressure in a transformer.
Background
The pressure relief valve is a pressure protection device for a transformer, and when there is a serious fault in the transformer, oil is decomposed to generate a large amount of gas. Because the transformer is basically a closed object, the diameter of the connecting pipe communicated with the oil storage cabinet is smaller, the pressure cannot be effectively and rapidly reduced only by the connecting pipe communicated with the oil storage cabinet, the pressure in the oil tank is rapidly increased, and the oil tank of the transformer is broken. The pressure relief valve will be opened in time to remove part of the transformer oil and reduce the pressure in the oil tank. After the pressure in the oil tank is reduced, the pressure release valve is automatically closed, and the sealing of the oil tank is maintained.
The main structural style of the release valve is an external spring type, with or without a directional injection device. Its main components are valve body and electromechanical signal device. The relief valve top seal structure has a top seal structure with a high degree of reliability and operational stability. The structure of the top sealing gasket tightly embedded by epoxy resin improves the stability of the sealing gasket in the process of releasing strong pressure. The cyanide rubber second contact type sealing gasket ensures more reliable operation. The double springs in the forward and reverse directions and the assembly method thereof ensure the uniform load of the valve and improve the release rate.
Currently, no field check condition is provided for the pressure relief valve, and it is generally recommended to remove the inspection during the overhaul of the transformer. However, due to the long overhaul intervals of the transformer, the pressure relief valve may be rejected due to long-term non-testing. The existing pressure relief valve cannot be effectively tested in transformer operation.
Disclosure of Invention
In view of this, the present invention aims to solve the problem that the existing pressure relief valve cannot be tested during the operation of the transformer, resulting in possible rejection.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the present invention provides a device for protecting a transformer from excessive oil pressure relief, comprising: the two-stage pressure release valve module and the detection control module;
the two-stage pressure release valve module is arranged at the mounting position of the original pressure release valve of the transformer and is obtained by connecting two pressure release valves with completely consistent model parameters in series, one end of the two-stage pressure release valve module is connected with a pressure release outlet of the transformer, and the other end of the two-stage pressure release valve module is connected with an oil guide pipe;
the detection end of the detection control module is connected with the two-stage pressure release valve module, and the control end is connected with the oil guide pipe and the charging port of the transformer;
when the transformer normally operates, any one pressure release valve in the two-stage pressure release valve module is subjected to a pressurization test, the other pressure release valve keeps working normally, the states of the two pressure release valves are determined after the two pressure release valves are subjected to multiple tests, and the detection control module controls the oil guide pipe and the charging port to be normally opened and closed.
Further, the detection control module includes: the device comprises a detection module, a valve opening and closing module and a control module;
the detection module is used for collecting the pressure of the oil guide pipe and the inflation inlet;
the control module is used for controlling the opening and closing of the oil guide pipe and the inflation inlet through the valve opening and closing module according to the collected pressure condition.
Further, the control module is used for controlling the opening and closing of the oil guide pipe and the inflation inlet through the valve opening and closing module according to the collected pressure condition, and specifically comprises the following steps:
when the transformer operates normally, if the pressure of the oil guide pipe and the pressure of the charging port are in a normal range, the control module controls the oil guide pipe and the charging port to be closed through the valve opening and closing module; if the oil pressure of the oil guide pipe exceeds the normal range, the control module controls the oil guide pipe and the inflation inlet to be opened through the valve opening and closing module;
when the transformer performs pressurization and leakage detection, if the two-stage pressure release valve module acts, the control module controls the oil guide pipe to be closed through the valve opening and closing module, and the charging port is opened so as to release the air pressure in the transformer.
Further, the method further comprises the following steps: an alarm module;
the alarm module is used for giving an alarm according to an alarm instruction, and the alarm instruction is generated by the control module when the pressure at the oil guide pipe or the inflation inlet exceeds a normal range.
Further, after at least 3 pressurization tests, any one pressure release valve in the two-stage pressure release valve module obtains corresponding test parameters, so that the state of the corresponding pressure release valve is determined.
Further, the detection module specifically includes: an oil pressure sensor and an air pressure sensor;
the oil pressure sensor is arranged at the oil guide pipe and used for detecting the oil pressure of the port of the oil guide pipe;
the air pressure sensor is arranged at the air charging port and used for detecting the air pressure of the air charging port.
Further, the valve opening and closing module specifically includes: an oil guide pipe electromagnetic valve and an inflation inlet electromagnetic valve;
the oil guide pipe electromagnetic valve is arranged at the oil guide pipe and used for controlling the opening and closing of the oil guide pipe;
the inflation inlet solenoid valve is arranged at the inflation inlet and used for controlling the opening and closing of the inflation inlet.
In a second aspect, the present invention provides a transformer internal oil pressure excessive pressure relief protection system, operating based on the transformer internal oil pressure excessive pressure relief protection apparatus as in the first aspect, comprising: a detection unit and a control unit;
the detection unit is used for detecting the pressure of the transformer oil guide pipe and the transformer inflation inlet;
the control unit is used for controlling the normal open and close of the oil guide pipe and the inflation inlet according to the detected pressure.
Further, the control unit is used for controlling the normal open and close of the oil guide pipe of the transformer and the inflation inlet of the transformer according to the detected pressure, and specifically comprises the following steps:
when the transformer operates normally, if the pressure of the oil guide pipe and the pressure of the charging port are in a normal range, the control unit controls the oil guide pipe and the charging port to be closed; if the oil pressure of the oil guide pipe exceeds the normal range, the control unit controls the oil guide pipe and the inflation inlet to be opened;
when the transformer performs pressurization and leakage detection, if the two-stage pressure release valve module acts, the control unit controls the oil guide pipe to be closed, and the charging port to be opened so as to release the air pressure in the transformer.
Further, the method further comprises the following steps: an alarm unit;
the alarm unit is used for alarming when the pressure at the oil guide pipe or the inflation inlet exceeds the normal range according to the instruction of the control unit.
In summary, the invention provides a device and a system for protecting the pressure relief of the excessive oil pressure in a transformer, which comprises a two-stage pressure relief valve module arranged at the mounting position of an original pressure relief valve of the transformer, wherein the two-stage pressure relief valve module is formed by connecting two pressure relief valves with completely consistent model parameters in series, one end of the two-stage pressure relief valve module is connected with a pressure relief outlet of the transformer, and the other end of the two-stage pressure relief valve module is connected with an oil guide pipe; the system also comprises a detection control module; when the transformer normally operates, any one pressure release valve in the two-stage pressure release valve module is subjected to a pressurization test, the other pressure release valve keeps working normally, the states of the two pressure release valves are determined after the two pressure release valves are subjected to multiple tests, and the detection control module controls the oil guide pipe and the charging port to be normally opened and closed. According to the invention, the two-stage pressure release valve is arranged, so that the state of the pressure release valve can be determined through the test in the running process of the transformer, and the problem of refusal in long-term non-test is avoided.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic installation diagram of an oil pressure overload release protection device in a transformer according to an embodiment of the present invention.
In the accompanying drawings: the device comprises a 1-two-stage pressure release valve, a 2-oil pressure sensor, a 3-oil pipe electromagnetic valve, a 4-inflation inlet three-way head, a 5-inflation inlet electromagnetic valve, a 6-air pressure sensor, a 7-test valve, an 8-control module and a 9-alarm lamp.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A detailed description will be given first of a conventional pressure relief valve for a transformer.
According to the standard GB/T6451-1999, pressure protection devices should be provided for transformers having a capacity of 800kVA and above. The pressure relief valve is mounted on the upper portion of the transformer oil tank. For the high-capacity transformer, sometimes the pressure relief valve is arranged on the side surface of the upper part of the transformer oil tank, and for oil discharge convenience, the oil discharge pipe is arranged at the outlet of the pressure relief valve.
There are two types of pressure relief devices: a safety air passage (explosion proof cylinder) and a pressure relief valve. The safety air passage is of a release film structure, and when the internal pressure of the transformer rises, the release film is broken to release the pressure. The pressure release valve is an alternative product of a safe air passage, is widely used at present, and has the structure that a spring presses a membrane disc, and the pressure overcomes the pressure of the spring to wash away the membrane disc for release, so that the pressure release valve has the greatest advantage of being capable of automatically recovering. The pressure relief valve generally requires an opening pressure corresponding to a closing pressure and a failure opening time of less than 2ms, so that the opening pressure, the closing pressure and the opening time all need to be checked when checking the pressure relief valve. The pressure release valve is provided with a contact which is linked with the action of the release valve and acts on signal alarm or tripping.
The pressure relief valve has four basic terms of opening pressure, closing pressure, opening time and sealing pressure. The opening pressure is the inlet static pressure to which the membrane disc of the release valve is subjected when the transformer oil is continuously discharged. The closing pressure is the inlet static pressure to which the membrane disc is subjected, i.e. the pressure at which leakage through the sealing means ceases, when the membrane disc re-contacts the valve seat or when the opening height is zero. The opening time is the opening pressure of the pressure channel acted by the membrane disc, and the release valve is not opened immediately, so that the opening time is prolonged. The sealing pressure is an inlet pressure above the closing pressure and below the opening pressure, and when the inlet pressure rises to this pressure value, the relief valve should seal reliably against leakage.
The pressure relief valve comprises a Quali pressure relief valve, a MESSKO pressure relief valve, a YSF pressure relief valve, a COMEN pressure relief valve, and several typical pressure relief valves, the working principle of which is described in detail below.
The COMEN valve has the functions of corrosion prevention and preventing foreign objects from penetrating between the shell disc and the protection disc, so that the safety valve can maintain a normal operation state for a long time. The valve includes a flange-containing housing and a corrosion-resistant aluminum alloy disk with a spring steel support in the middle. There are two sealing rings in the valve: a specially made upper sealing plate (gasset) and a rubber O-ring.
The upper sealing land presses against the valve disc when the valve is closed. The tailored shape of the sealing plate maintains a good sealing effect when the disc is moved upwards by 1-2mm, while the valve disc is pressed and sealed against the edge of the rubber ring. When the internal air pressure increases to move the valve disc upwards beyond the limit, the upper sealing piece cannot seal, the edge seal is kept at the moment, the area of the internal pressure added to the valve disc is increased, the spring bears larger pressure, and the safety valve is immediately fully opened to discharge excessive pressure.
After the pressure is vented, the spring pushes the valve disc back and closes the pressure relief valve. The disc moves downward pushing away the edge seal due to the tailored shape of the upper sealing plate when depressed by 1-2 mm. This vents the pressure that may be trapped in the two seals. At this point the pressure relief valve resumes normal operation. The pressure relief valve may provide a mechanical visual alarm system. The valve comprises a push rod arranged in the middle of a protective shell, wherein the push rod protrudes out of the shell when the valve is started, and can be easily pushed back to restore operation. A pressure relief valve actuated alarm system may be provided that includes a device contact switch within the sealed housing. This system operates in conjunction with the sight alert system, and when the valve is actuated to push out the pushrod, the contact system will remain closed until the pushrod is pushed back.
With the conventional pressure release valve device described above, it cannot be effectively tested in transformer operation, but long-term non-testing of the pressure release valve may result in its rejection. Accordingly, the invention provides a device and a system for protecting the release of the excessive oil pressure in the transformer.
The following is a detailed description of an embodiment of the present invention for a transformer internal oil pressure overpressure relief protection apparatus.
The embodiment provides a transformer inside oil pressure too high pressure release protection device, includes: the system comprises a two-stage pressure release valve module and a detection control module.
The two-stage pressure release valve module is arranged at the mounting position of the original pressure release valve of the transformer and is obtained by connecting two pressure release valves with completely consistent model parameters in series, one end of the two-stage pressure release valve module is connected with a pressure release outlet of the transformer, and the other end of the two-stage pressure release valve module is connected with an oil guide pipe;
the detection end of the detection control module is connected with the two-stage pressure release valve module, and the control end is connected with the oil guide pipe and the charging port of the transformer;
when the transformer normally operates, any one pressure release valve in the two-stage pressure release valve module is subjected to a pressurization test, the other pressure release valve keeps working normally, the states of the two pressure release valves are determined after the two pressure release valves are subjected to multiple tests, and the detection control module controls the oil guide pipe and the charging port to be normally opened and closed.
In the protection device provided in this embodiment, the two-stage pressure release valve replaces the conventional pressure release valve of the large-scale power transformer, and is connected in series by two pressure release valves with identical parameters, namely, an upper-stage pressure release valve and a lower-stage pressure release valve. The opening pressure, closing pressure, opening time and sealing performance of the two-stage pressure release valve are consistent with the definition of the traditional pressure release valve. This ensures that the use of a dual stage pressure relief valve does not interfere with the conventional transformer pressure relief action.
For the two-stage pressure release valve, the action characteristic of the lower-stage pressure release valve can be tested at the position of the lower-stage test valve in a pressurizing mode; the upper stage pressure relief valve actuation characteristics, such as opening pressure and closing pressure, are tested under pressurization at the upper stage test valve. The opening pressure is used as the most basic action characteristic parameter of the pressure release valve, the test method is that compressed gas is filled into the test valve at normal temperature, the pressure increment reaches 25 kPa/s-40 kPa/s, and the opening pressure value of the pressure release valve is the opening pressure. The pressure release valve should close the inlet valve immediately after actuation. The pressure relief valve will close slowly as the pressure in the canister is still greater than the closing pressure of the pressure relief valve. When the pointer of the pressure gauge is completely stopped, the pointer is completely closed, and the reading of the pointer is the closing pressure value of the pressure release valve. The closing pressure should meet the relevant regulations, the test times are not less than 3 times, and the minimum value is taken as the closing pressure value.
The embodiment provides an oil pressure over-high pressure release protection device in a transformer, which comprises a two-stage pressure release valve module arranged at the installation position of an original pressure release valve of the transformer, wherein the two-stage pressure release valve module is formed by connecting two pressure release valves with completely consistent model parameters in series, one end of the two-stage pressure release valve module is connected with a pressure release outlet of the transformer, and the other end of the two-stage pressure release valve module is connected with an oil guide pipe; the system also comprises a detection control module; when the transformer normally operates, any one pressure release valve in the two-stage pressure release valve module is subjected to a pressurization test, the other pressure release valve keeps working normally, the states of the two pressure release valves are determined after the two pressure release valves are subjected to multiple tests, and the detection control module controls the oil guide pipe and the charging port to be normally opened and closed. According to the invention, the two-stage pressure release valve is arranged, so that the state of the pressure release valve can be determined through the test in the running process of the transformer, and the problem of refusal in long-term non-test is avoided.
In a further embodiment of the invention, on the basis of setting the two-stage pressure release valve to realize the effective test of the pressure release valve in operation, a detection module, a valve opening and closing module and a control module are further arranged so as to further improve the timeliness of pressure release of the transformer when the internal oil pressure is too high. The detection module is used for collecting the pressure of the oil guide pipe and the inflation inlet; the control module is used for controlling the opening and closing of the oil guide pipe and the inflation inlet through the valve opening and closing module according to the collected pressure condition.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating an installation of an apparatus for protecting an excessive oil pressure relief in a transformer according to an embodiment of the invention. Wherein, detection module can be provided with oil pressure sensor 2 and air pressure sensor 6, sets up respectively in oil pipe department and aerify tee bend head 4 department. The valve opening and closing module can be provided with an oil guide pipe electromagnetic valve 3 and an inflation inlet electromagnetic valve 5, and the control module 8 is arranged at the transformer and connected with each part through corresponding cables. In addition, an alarm module can be further arranged, the alarm lamp 9 can be connected with the control module 8 in actual implementation, and the control module 8 controls the alarm lamp 9 to carry out audible and visual alarm when certain conditions are met. The test valve 7 is a test valve for performing a pressurization test on the two-stage pressure release valve.
The middle of the oil guide pipe is controlled to be opened and closed by an array of oil guide pipe electromagnetic valves 3, one of the three-way heads 4 of the air charging port is controlled to be opened and closed by an air charging port electromagnetic valve 5, and air pressure is detected by an air pressure sensor 6. The control module can be a PLC control system, monitors the pressure of an oil pressure sensor and a pressure of an air pressure sensor, opens and closes the oil pipe electromagnetic valve 3 and the inflation inlet electromagnetic valve 5 according to certain logic, and alarms when the pressure of the two-stage pressure release valve 1 and the pressure of the two sensors are too high.
Specifically, when the main transformer works normally, the oil pressure at the two-stage pressure release valve 1 is lower, the oil guide pipe electromagnetic valve 3 and the inflation inlet electromagnetic valve 5 are normally closed, and no alarm is given. When the internal oil pressure of the main transformer rises, the pressure detection control system gives an audible and visual alarm, the oil guide pipe electromagnetic valve 3 and the inflation inlet electromagnetic valve 5 are started (the starting pressure of the electromagnetic valve is smaller than the starting pressure of the pressure release valve), and the internal gas of the transformer oil and the conservator capsule is timely discharged.
When the main transformer is overhauled, the inflation inlet is required to be pressurized and leak-detected, the oil guide pipe electromagnetic valve 3 and the inflation inlet electromagnetic valve 5 are normally closed, and when the pressure at the positions of the oil guide pipe electromagnetic valve 3 and the inflation inlet electromagnetic valve 5 is too high, the audible and visual alarm is given; when the double-stage pressure release valve 1 acts during pressurization, the oil guide pipe electromagnetic valve 3 is closed, the inflation inlet electromagnetic valve 5 is opened, the added air pressure is released, and the main transformer is prevented from continuously discharging oil.
In normal operation of the transformer, severe operation conditions such as high temperature and the like can cause ageing of a sealing rubber ring, jamming of a spring or a machine part, potential safety hazards such as leakage, false alarm or refusal are easily generated when the transformer is operated continuously, and unplanned operation and even fault range expansion of the transformer are caused. The two-stage pressure release valve is different from the traditional single pressure release valve in that the function of adding one-stage pressure release is added, and the main transformer is prevented from being stopped in an unscheduled way due to misoperation of the one-stage pressure release valve. The working process of the two-stage pressure release valve is specifically as follows: when serious discharge faults occur in the transformer, both the two pressure relief valves of the two-stage pressure relief valve act to relieve excessive pressure in the transformer. When the primary pressure release valve is in misoperation due to the quality problem of the primary pressure release valve, the butterfly valve of the transformer body to the conservator through the gas relay is not opened, the transformer breathes unevenly, the transformer is excessively filled with oil, and the like, the secondary pressure release valve does not act, and the main transformer is prevented from receiving signals to stop operation.
Compared with the prior art, the protection device provided by the invention has the following advantages:
1. the double-stage pressure relief valve with pressure detection replaces the traditional pressure relief valve of a large-scale power transformer, and an oil pressure sensor is arranged in the double-stage pressure relief valve to detect the oil pressure at the double-stage pressure relief valve and upload the oil pressure to a pressure detection control system. The pressure detection control system is a PLC control system, detects the pressure of the air pressure sensor and the oil pressure sensor, opens and closes the two electromagnetic valves according to certain logic, and gives an audible and visual alarm when the primary pressure release valve acts. And alarming when the pressure of the two sensors is too high. The pressure release valve on-line test in the operation of the transformer can be performed while the real-time monitoring of the transformer is realized, so that the operation safety and reliability of the transformer are ensured.
2. The top portion of the conventional pressure relief valve will protrude a colored pin after actuation and the operator will find that the pressure relief valve has been actuated when looking at it. However, the response speed of the alarm mode is slower, the alarm mode depends on the inspection frequency and time, and the faults of the transformer cannot be processed in time. The audible and visual alarm lamp can trigger audible and visual alarm after the pressure release valve acts or the pressure is abnormal, actively prompt operators, ensure that the transformer can be processed in the first time after the transformer fails, and reduce the safety risk of equipment.
3. In the process of overhauling, pressurizing and leakage detecting the main transformer, the main transformer is prevented from continuously discharging oil by adjusting the air pressure released by the electromagnetic valve array, and the waste of transformer oil is avoided. And the electromagnetic valve is controlled to prevent the misoperation of the pressure release valve during pressurization.
The above is a detailed description of an embodiment of an excess oil pressure relief protection device for a transformer according to the present invention, and an embodiment of an excess oil pressure relief protection system for a transformer according to the present invention will be described in detail.
The present embodiment provides a system for protecting against excessive oil pressure relief in a transformer, which is operated based on the apparatus for protecting against excessive oil pressure relief in a transformer according to the first aspect, comprising: a detection unit and a control unit;
the detection unit is used for detecting the pressure of the transformer oil guide pipe and the transformer inflation inlet;
the control unit is used for controlling the normal open and close of the oil guide pipe and the inflation inlet according to the detected pressure.
Further, the control unit is used for controlling the normal open and close of the oil guide pipe of the transformer and the inflation inlet of the transformer according to the detected pressure, and specifically comprises the following steps:
when the transformer operates normally, if the pressure of the oil guide pipe and the pressure of the charging port are in a normal range, the control unit controls the oil guide pipe and the charging port to be closed; if the oil pressure of the oil guide pipe exceeds the normal range, the control unit controls the oil guide pipe and the inflation inlet to be opened;
when the transformer performs pressurization and leakage detection, if the two-stage pressure release valve module acts, the control unit controls the oil guide pipe to be closed, and the charging port to be opened so as to release the air pressure in the transformer.
Further, the method further comprises the following steps: an alarm unit;
the alarm unit is used for alarming when the pressure at the oil guide pipe or the inflation inlet exceeds the normal range according to the instruction of the control unit.
It should be noted that, the protection system provided in this embodiment operates based on the protection device provided in the foregoing embodiment, and specific setting of each unit is based on the complete implementation of the method, which is not described herein again.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An excess oil pressure relief protection device for a transformer interior, comprising: the two-stage pressure release valve module and the detection control module;
the two-stage pressure release valve module is arranged at the mounting position of the original pressure release valve of the transformer and is obtained by connecting two pressure release valves with completely consistent model parameters in series, one end of the two-stage pressure release valve module is connected with a pressure release outlet of the transformer, and the other end of the two-stage pressure release valve module is connected with an oil guide pipe;
the detection end of the detection control module is connected with the two-stage pressure release valve module, and the control end is connected with the oil guide pipe and the charging port of the transformer;
when the transformer normally operates, a pressurizing test is carried out on any one pressure release valve in the two-stage pressure release valve module, the other pressure release valve keeps working normally, the states of the two pressure release valves are determined after the two pressure release valves are subjected to multiple tests, and the detection control module controls the oil guide pipe and the charging port to be normally opened and closed.
2. The transformer internal oil pressure excess pressure relief protection device of claim 1, wherein the detection control module comprises: the device comprises a detection module, a valve opening and closing module and a control module;
the detection module is used for collecting the pressure of the oil guide pipe and the inflation inlet;
the control module is used for controlling the opening and closing of the oil guide pipe and the inflation inlet through the valve opening and closing module according to the collected pressure condition.
3. The device for protecting the release of the excessive oil pressure inside the transformer according to claim 2, wherein the control module is configured to control the opening and closing of the oil guide pipe and the charging port through the valve opening and closing module according to the collected pressure condition, and specifically comprises:
when the transformer operates normally, if the pressure of the oil guide pipe and the pressure of the charging port are in a normal range, the control module controls the oil guide pipe and the charging port to be closed through the valve opening and closing module; if the oil pressure of the oil guide pipe exceeds the normal range, the control module controls the oil guide pipe and the inflation inlet to be opened through the valve opening and closing module;
when the transformer performs pressurization and leakage detection, if the two-stage pressure release valve module acts, the control module controls the oil guide pipe to be closed through the valve opening and closing module, and the inflation inlet is opened to release the air pressure in the transformer.
4. The transformer internal oil pressure excess pressure relief protection device according to claim 3, further comprising: an alarm module;
the alarm module is used for sending an alarm according to an alarm instruction, and the alarm instruction is generated by the control module when the pressure at the oil guide pipe or the inflation inlet exceeds a normal range.
5. The device for protecting the excessive oil pressure release in the transformer according to claim 1, wherein the state of the corresponding pressure release valve is determined by obtaining corresponding test parameters after at least 3 pressurization tests of any one of the two-stage pressure release valve modules.
6. The device for protecting the release of the excessive oil pressure inside the transformer according to claim 2, wherein the detection module specifically comprises: an oil pressure sensor and an air pressure sensor;
the oil pressure sensor is arranged at the oil guide pipe and is used for detecting the oil pressure of the port of the oil guide pipe;
the air pressure sensor is arranged at the air charging port and is used for detecting the air pressure of the air charging port.
7. The excess oil pressure relief protection device for transformer internal pressure according to claim 2, wherein the valve opening and closing module specifically comprises: an oil guide pipe electromagnetic valve and an inflation inlet electromagnetic valve;
the oil guide pipe electromagnetic valve is arranged at the oil guide pipe and used for controlling the opening and closing of the oil guide pipe;
the inflation inlet electromagnetic valve is arranged at the inflation inlet and used for controlling the opening and closing of the inflation inlet.
8. A transformer internal oil pressure excess pressure relief protection system operating based on the transformer internal oil pressure excess pressure relief protection device according to any one of claims 1-7, characterized by comprising: a detection unit and a control unit;
the detection unit is used for detecting the pressure of the transformer oil guide pipe and the transformer inflation inlet;
the control unit is used for controlling the normal open and close of the oil guide pipe and the inflation inlet according to the detected pressure.
9. The system according to claim 8, wherein the control unit is configured to control the normal open/close of the oil conduit and the charging port of the transformer according to the detected pressure, and specifically comprises:
when the transformer operates normally, if the pressure of the oil guide pipe and the pressure of the charging port are in a normal range, the control unit controls the oil guide pipe and the charging port to be closed; if the oil pressure of the oil guide pipe exceeds the normal range, the control unit controls the oil guide pipe and the inflation inlet to be opened;
when the transformer performs pressurization and leakage detection, if the two-stage pressure release valve module acts, the control unit controls the oil guide pipe to be closed, and the inflation inlet is opened to release the air pressure in the transformer.
10. The transformer internal oil pressure excess pressure relief protection system of claim 9, further comprising: an alarm unit;
the alarm unit is used for alarming when the pressure at the oil guide pipe or the inflation inlet exceeds a normal range according to the instruction of the control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310743189.2A CN116525256A (en) | 2023-06-21 | 2023-06-21 | Device and system for protecting transformer inside from over-high oil pressure release |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310743189.2A CN116525256A (en) | 2023-06-21 | 2023-06-21 | Device and system for protecting transformer inside from over-high oil pressure release |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116525256A true CN116525256A (en) | 2023-08-01 |
Family
ID=87396191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310743189.2A Pending CN116525256A (en) | 2023-06-21 | 2023-06-21 | Device and system for protecting transformer inside from over-high oil pressure release |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116525256A (en) |
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2023
- 2023-06-21 CN CN202310743189.2A patent/CN116525256A/en active Pending
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