A pressure monitoring device and method for the oil chamber of an on-load tap-changer

Abstract

The present invention belongs to the technical field of substation equipment condition monitoring, and particularly relates to an on-load tap-changer oil chamber pressure monitoring device and method. The present invention includes an on-load tap-changer oil chamber and an on-load tap-changer oil conservator, and further includes an intelligent terminal. The on-load tap-changer oil chamber is connected to the on-load tap-changer oil conservator through a connecting pipe, and a pressure sensor electronic tag bolt is also connected to the connecting pipe. The device of the present invention has the characteristics of simple structure and convenient operation. It can facilitate the maintenance personnel to read the pressure value of the on-load tap-changer oil chamber during the ground inspection process, read the pressure value through the intelligent terminal and the electronic tag, and store the historical pressure value. The maintenance strategy of the on-load tap-changer is formulated through the absolute value of the pressure and the change rate of the pressure value, so that the maintenance personnel can timely discover the hidden dangers of the on-load tap-changer, and the safety of the maintenance is significantly improved. At the same time, the failure rate of the on-load tap-changer is effectively reduced, and the work efficiency is significantly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of substation equipment condition monitoring, and particularly relates to a on-load tap-changer oil chamber pressure monitoring device and method. Background Art

[0002] To meet the requirements of users for power quality, the on-load tap-changer of an operating power transformer needs to adjust the voltage by changing the tap position. With the increase in the number of operations of the on-load tap-changer, problems such as loose fasteners, insufficient spring kinetic energy, contact wear, and abnormal switching current may occur, causing the insulating oil in the on-load tap-changer oil chamber to generate energy and characteristic gases exceeding normal operation, and further leading to a change in the pressure of the on-load tap-changer oil chamber. Due to the huge volume of the transformer, the top cover of the on-load tap-changer oil chamber is in the direction of the upper cover of the transformer body, and the upper cover of the transformer body is much higher than the line of sight of the operation and maintenance personnel. When the operation and maintenance personnel conduct ground inspections, it is almost impossible to obtain the pressure value of the on-load tap-changer oil chamber. Summary of the Invention

[0003] In view of the deficiencies in the above-mentioned prior art, the present invention provides a on-load tap-changer oil chamber pressure monitoring device and method. The purpose is to enable operation and maintenance personnel to read the real-time and historical values of the on-load tap-changer oil chamber pressure through ground inspections using intelligent terminals and electronic tags, timely discover potential hazards in the on-load tap-changer, formulate power outage and maintenance strategies, and reduce the occurrence of on-load tap-changer failures.

[0004] The technical solution adopted by the present invention to achieve the above purpose is as follows:

[0005] A on-load tap-changer oil chamber pressure monitoring device includes: an on-load tap-changer oil chamber and an on-load tap-changer oil conservator. The feature is that it further includes an intelligent terminal. The on-load tap-changer oil chamber is connected to the on-load tap-changer oil conservator through a first connecting pipe and a second connecting pipe. A valve is connected to the T-shaped pipeline connected between the first connecting pipe and the second connecting pipe, and a pressure sensor electronic tag bolt is connected to the flange at one end of the valve.

[0006] Further, one end of the reserved flange of the on-load tap-changer oil chamber is connected to the first connecting pipe through a flange; the other end of the second connecting pipe is connected to the reserved flange of the on-load tap-changer oil conservator; the first connecting pipe is also connected to the T-shaped pipeline through a flange, the third end of the T-shaped pipeline is connected to the valve through a flange, and the other end of the valve is connected to the pressure sensor electronic tag bolt through a flange.

[0007] Furthermore, the pressure sensor electronic tag bolt includes: a metal plate, a metal expander, a spring, bolt threads, a bolt nut, and an electronic tag; the metal plate is adhered to the top plane of the metal expander by double-sided tape, and the bottom end of the metal expander is connected to one side of the bolt nut; the spring is adhered and fixed to the lower part of the metal plate through double-sided tape, and the lower end of the spring is adhered to the upper part of the electronic tag; the electronic tag is connected to one side of the bolt nut.

[0008] Furthermore, the shape of the electronic tag is circular, and the cross-section is trapezoidal; the electronic tag includes: a metal layer, a resin layer, a buffer layer, a circuit layer, and a protective layer; the metal layer and the resin layer are connected by casting; the buffer layer, the circuit layer, and the protective layer are adhered together in sequence by hot melt adhesive.

[0009] Furthermore, the metal layer selects 304 stainless steel material; the resin layer selects polyester resin material; the buffer layer selects foam material; the circuit layer selects Printed Circuit Board; the protective layer selects polyester resin material.

[0010] Furthermore, the structure or shape of the metal layer is circular, and the cross-section is trapezoidal;

[0011] The resin layer, the buffer layer, the circuit layer, and the protective layer are circular in shape, and the cross-section is trapezoidal;

[0012] The metal layer, the resin layer, and the three layers are adhered together by hot melt adhesive.

[0013] Furthermore, the circuit layer includes: a UHF RF antenna, a UHF automatically adjustable and matchable chip, and a battery; the UHF RF antenna is connected to the UHF automatically adjustable and matchable chip, and the UHF automatically adjustable and matchable chip is connected to the battery; the UHF automatically adjustable and matchable chip can store an identity identifier.

[0014] A method for monitoring the pressure of the on-load tap-changer oil chamber includes the following steps:

[0015] Step 1: Write the identity identifier information and the impedance value-pressure value analysis program of the pressure sensor electronic tag bolt into the UHF automatically adjustable and matchable chip and the intelligent terminal respectively;

[0016] Step 2: Start the intelligent terminal 7 and read the information of the pressure sensor electronic tag bolt;

[0017] Step 3: When the identity identifier of the UHF automatically adjustable and matchable chip is consistent with the identity identifier of the intelligent terminal, the pressure value of the UHF automatically adjustable and matchable chip returns the impedance value to the intelligent terminal through the UHF RF antenna;

[0018] Step 4: The intelligent terminal analyzes the pressure value of the on-load tap-changer oil chamber for reference.

[0019] Further, in Step 1, before installing the pressure sensor electronic tag bolt, the intelligent terminal writes the unique identity identifier of the pressure sensor electronic tag bolt into the ultra-high frequency automatically adjustable and matchable chip of the pressure sensor electronic tag bolt. The ultra-high frequency automatically adjustable and matchable chip has the function of storing the identity identifier. The intelligent terminal is pre-written with the analysis program of the impedance value and the pressure value of the pressure sensor electronic tag bolt.

[0020] In Step 2, when the operation and maintenance personnel patrol near the on-load tap-changer of the transformer, the intelligent terminal emits energy, and the pressure sensor electronic tag bolt is enabled when it receives the energy.

[0021] In Step 3, when the identity identifier read by the pressure sensor electronic tag bolt from the ultra-high frequency automatically adjustable and matchable chip written before installation is consistent with the identity identifier searched by the intelligent terminal 7, the pressure value of the ultra-high frequency automatically adjustable and matchable chip returns the impedance value to the intelligent terminal through the ultra-high frequency radio frequency antenna.

[0022] In Step 4, the intelligent terminal analyzes the pressure value of the on-load tap-changer oil chamber through the pre-written correspondence between the impedance value and the pressure value, and reads the pressure value of the on-load tap-changer oil chamber from the intelligent terminal for making maintenance decisions.

[0023] Further, when the oil pressure in the on-load tap-changer oil chamber changes, the metal expander is compressed or expanded with the change of the oil pressure, the position of the metal plate relative to the ultra-high frequency radio frequency antenna also changes, and the impedance value of the ultra-high frequency radio frequency antenna also changes, causing the impedance matching imbalance between it and the ultra-high frequency automatically adjustable and matchable chip, resulting in the ultra-high frequency automatically adjustable and matchable chip automatically adjusting its impedance value until it matches and balances with the impedance value of the ultra-high frequency radio frequency antenna.

[0024] When the oil pressure in the on-load tap-changer oil chamber changes, the position of the metal plate relative to the ultra-high frequency radio frequency antenna changes, and the impedance values matched by the ultra-high frequency automatically adjustable and matchable chips are different. Each impedance value of the ultra-high frequency automatically adjustable and matchable chip corresponds to a unique pressure value of the on-load tap-changer oil chamber. According to the given curve graph of the correspondence between the impedance value and the pressure value of the ultra-high frequency automatically adjustable and matchable chip, the intelligent terminal reads the pressure value of the on-load tap-changer oil chamber.

[0025] The high-frequency RF antenna receives the signal transmitted by the intelligent terminal and transmits it to the ultra-high-frequency automatically adjustable and matchable chip; according to the instruction of the intelligent terminal, the high-frequency RF antenna transmits the information in the ultra-high-frequency automatically adjustable and matchable chip. The intelligent terminal receives the signal transmitted by the high-frequency RF antenna and analyzes the pressure value corresponding to the impedance value of the ultra-high-frequency automatically adjustable and matchable chip, that is, the pressure value of the on-load tap-changer oil chamber.

[0026] The present invention has the following beneficial effects and advantages:

[0027] The on-load tap-changer oil chamber pressure monitoring device of the present invention has the characteristics of simple structure and convenient operation. This device can facilitate the maintenance personnel to read the pressure value of the on-load tap-changer oil chamber during the ground inspection process, read the pressure value through the intelligent terminal and the electronic tag, and store the historical pressure value. The maintenance personnel can formulate the maintenance strategy of the on-load tap-changer based on the absolute pressure value and the pressure value change rate, which can enable the maintenance personnel to discover the hidden dangers of the on-load tap-changer in time and significantly improve the safety of the operation and maintenance. At the same time, the present invention can also effectively reduce the failure rate of the on-load tap-changer and significantly improve the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0029] Figure 1 is a schematic structural diagram of the device of the present invention;

[0030] Figure 2 is a schematic structural diagram of the pressure sensor electronic tag bolt in the present invention;

[0031] Figure 3 is a schematic structural diagram of the electronic tag in the present invention;

[0032] Figure 4 is a front sectional view of the circuit layer of the electronic tag in the present invention.

[0033] In the figure: on-load tap-changer oil chamber 1, first connecting pipe 2, T-shaped pipeline 3, valve 4, pressure sensor electronic tag bolt 5, on-load tap-changer oil conservator 6, intelligent terminal 7, second connecting pipe 8, metal plate 51, metal expander 52, spring 53, bolt thread 54, bolt nut 55, electronic tag 56, metal layer 561, resin layer 562, buffer layer 563, circuit layer 564, protective layer 565, ultra-high-frequency RF antenna 5641, ultra-high-frequency automatically adjustable and matchable chip 5642, battery 5643. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] In order to more clearly understand the above-mentioned objects, features, and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0035] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0036] The following refers to Figures 1-4 Describe the technical solutions of some embodiments of the present invention.

[0037] Embodiment 1

[0038] The present invention is an on-load tap-changer oil chamber pressure monitoring device, as Figure 1 shown, Figure 1 is a schematic structural diagram of the device of the present invention.

[0039] The device of the present invention mainly includes: on-load tap-changer oil chamber 1, first connecting pipe 2, T-shaped pipeline 3, valve 4, pressure sensor electronic tag bolt 5, on-load tap-changer oil storage tank 6, intelligent terminal 7, and second connecting pipe 8.

[0040] Among them, the on-load tap-changer oil chamber 1, first connecting pipe 2, T-shaped pipeline 3, valve 4, on-load tap-changer oil storage tank 6, intelligent terminal 7, and second connecting pipe 8 are all commercially available products. The first connecting pipe 2 is used to connect the on-load tap-changer oil chamber and the oil storage tank. One end of the connecting pipe 2 is connected to the reserved flange of the on-load tap-changer oil chamber 1 through a flange, and the other end of the first connecting pipe 2 is connected to the T-shaped pipeline 3 through a flange. The second end of the T-shaped pipeline is connected to the reserved flange of the on-load tap-changer oil storage tank 6 through the second connecting pipe 8 through a flange. The third end of the T-shaped pipeline 3 is connected to the valve 4 through a flange, and the other end of the valve 4 is connected to the pressure sensor electronic tag bolt 5 through a flange.

[0041] The intelligent terminal 7 is a commercially available product, and its program needs to be developed secondarily, and a parsing program for the impedance value and pressure value of the pressure sensor electronic tag bolt is written, which is used to read and write the identity identification information of the pressure sensor electronic tag bolt and parse the pressure value of the on-load tap-changer oil chamber.

[0042] As Figure 2 shown, Figure 2 is a schematic structural diagram of the pressure sensor electronic tag bolt in the present invention. The pressure sensor electronic tag bolt 5 in the present invention includes: metal electrode plate 51, metal expander 52, spring 53, bolt thread 54, bolt nut 55, and electronic tag 56.

[0043] Among them, the metal plate 51, the metal expander 52, the spring 53, the bolt thread 54, and the bolt nut 55 are all commercially available products. The metal plate 51 is pasted on the top plane of the metal expander 52 through double-sided tape, and the bottom end of the metal expander 52 is welded to one side of the bolt nut 55; the bolt nut 55 is provided with a bolt thread 54, and the bolt thread 54 is used to fix the pressure sensor electronic tag bolt 5 on the flange at one end of the valve 4 by means of bolt tightening, and this bolt thread 54 is obtained by processing the bolt nut 55; the spring 53 pastes and fixes its upper end on the lower plane of the metal plate 51 through double-sided tape, and the spring 53 pastes its lower end on the upper plane of the electronic tag 56 through the pasting method; the electronic tag 56 is connected to one side of the bolt nut 55 by welding.

[0044] As Figure 3 shown, Figure 3 is a schematic structural diagram of the electronic tag in the present invention. The shape of the electronic tag 56 in the present invention is a circular sheet, and the cross-section is a trapezoid;

[0045] The electronic tag 56 mainly includes: a metal layer 561, a resin layer 562, a buffer layer 563, a circuit layer 564, and a protective layer 565. The metal layer 561 and the resin layer 562 are connected by casting; the buffer layer 563, the circuit layer 564, and the protective layer 565 are sequentially pasted together by hot melt adhesive. The metal layer 561 selects 304 stainless steel material, the resin layer 562 selects polyester resin material, the buffer layer 563 selects foam material, the circuit layer 564 selects Printed Circuit Board, and the protective layer 565 selects polyester resin material.

[0046] The Printed Circuit Board is a printed circuit board and is a commercially available product.

[0047] The structure or shape of the metal layer 561 is a circular sheet, and the cross-section is a trapezoid;

[0048] The shapes of the resin layer 562, the buffer layer 563, the circuit layer 564, and the protective layer 565 are circular sheets, and the cross-sections are trapezoids;

[0049] The metal layer 561, the resin layer 562 and the three layers of the buffer layer 563, the circuit layer 564, and the protective layer 565 are pasted together by hot melt adhesive.

[0050] As Figure 4 shown, Figure 4It is a front cross-sectional view of the electronic tag circuit layer in the present invention. The circuit layer 564 of the electronic tag in the present invention includes: a UHF RF antenna 5641, a UHF automatically adjustable and matchable chip 5642, and a battery 5643, all of which are commercially available products.

[0051] The UHF automatically adjustable and matchable chip 5642 has the function of storing identity identification.

[0052] The UHF RF antenna 5641 is connected to the UHF automatically adjustable and matchable chip 5642 by welding, and the UHF automatically adjustable and matchable chip 5642 is connected to the battery 5643 by welding.

[0053] When the oil pressure in the on-load tap-changer oil chamber 1 changes, the metal expander 52 is compressed or expanded with the change of the oil pressure, and the position of the metal plate 51 relative to the UHF RF antenna 5641 also changes accordingly. The impedance value of the UHF RF antenna 5641 also changes accordingly, causing the impedance matching imbalance between it and the UHF automatically adjustable and matchable chip 5642, resulting in the UHF automatically adjustable and matchable chip 5642 automatically adjusting its impedance value until it matches the impedance value of the UHF RF antenna 5641. When the oil pressure in the on-load tap-changer oil chamber 1 changes, the position of the metal plate 51 relative to the UHF RF antenna 5641 changes, and the impedance values matched by the UHF automatically adjustable and matchable chip 5642 are different. Each impedance value of the UHF automatically adjustable and matchable chip 5642 corresponds to a unique pressure value of the on-load tap-changer oil chamber 1. According to the given curve graph of the impedance value of the UHF automatically adjustable and matchable chip 5642 corresponding to the pressure value, the pressure value of the on-load tap-changer oil chamber 1 can be read through the intelligent terminal 7.

[0054] The above-mentioned high-frequency RF antenna 5641 receives the signal transmitted by the intelligent terminal 7 and transmits it to the UHF automatically adjustable and matchable chip 5642; according to the instruction of the intelligent terminal 7, the high-frequency RF antenna 5641 transmits the information in the UHF automatically adjustable and matchable chip 5642. The intelligent terminal 7 receives the signal transmitted by the high-frequency RF antenna 5641 and analyzes the pressure value corresponding to the impedance value of the UHF automatically adjustable and matchable chip 5642, which is the pressure value of the on-load tap-changer oil chamber 1.

[0055] Embodiment 2

[0056] The present invention further provides an embodiment, a method for monitoring the pressure of the on-load tap-changer oil chamber, including the following steps:

[0057] Step 1: Write the identity identification information of the pressure sensor electronic tag bolt and the analysis program of the impedance value corresponding to the pressure value into the UHF automatically adjustable and matchable chip and the intelligent terminal 7 respectively.

[0058] Before installing the pressure sensor electronic tag bolt 5, the unique identity identifier of the pressure sensor electronic tag bolt 5 is written into the ultra-high frequency automatically adjustable and matchable chip 5642 of the pressure sensor electronic tag bolt 5 through the intelligent terminal 7. The ultra-high frequency automatically adjustable and matchable chip 5642 has the function of storing the identity identifier. The intelligent terminal 7 is pre-written with the analysis program of the impedance value and the pressure value of the pressure sensor electronic tag bolt 5.

[0059] Step 2: Start the intelligent terminal 7 and read the information of the pressure sensor electronic tag bolt.

[0060] When the operation and maintenance personnel make rounds, they carry the intelligent terminal 7 with them. When they make rounds near the on-load tap-changer of the transformer, they start the intelligent terminal 7. When the intelligent terminal 7 emits energy and the pressure sensor electronic tag bolt 5 receives the energy, it starts to transmit information to the intelligent terminal 7.

[0061] Step 3: When the identity identifier of the ultra-high frequency automatically adjustable and matchable chip is consistent with the identity identifier of the intelligent terminal, the impedance value of the pressure value of the ultra-high frequency automatically adjustable and matchable chip is returned to the intelligent terminal 7 through the ultra-high frequency radio frequency antenna.

[0062] When the pressure sensor electronic tag bolt 5 reads that the identity identifier written before installation in the ultra-high frequency automatically adjustable and matchable chip 5642 is consistent with the identity identifier searched by the intelligent terminal 7, the impedance value of the pressure value of the ultra-high frequency automatically adjustable and matchable chip 5642 is returned to the intelligent terminal 7 through the ultra-high frequency radio frequency antenna 5641.

[0063] Step 4: The intelligent terminal analyzes the pressure value of the on-load tap-changer oil chamber for the operation and maintenance personnel to refer to.

[0064] The intelligent terminal 7 analyzes the pressure value of the on-load tap-changer oil chamber 1 through the pre-written correspondence between the impedance value and the pressure value. The operation and maintenance personnel can read the pressure value of the on-load tap-changer oil chamber 1 from the intelligent terminal 7 to make maintenance decision-making.

[0065] In the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. The terms "connection" and "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0066] In the description of the present invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention.

[0067] In the description of this specification, the description of terms such as "one embodiment" and "some embodiments" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0068] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pressure monitoring device for the oil chamber of an on-load tap-changer, comprising: On-load tap-changer oil chamber (1) and on-load tap-changer oil conservator (6), characterized in that: it further includes an intelligent terminal (7), the on-load tap-changer oil chamber (1) is connected to the on-load tap-changer oil conservator (6) through a first connecting pipe (2) and a second connecting pipe (8), a valve (4) is connected to the T-shaped pipeline (3) connected in the middle of the first connecting pipe (2) and the second connecting pipe (8), and a pressure sensor electronic tag bolt (5) is connected to the flange at one end of the valve (4); the reserved flange end of the on-load tap-changer oil chamber (1) is connected to the first connecting pipe (2) through a flange; the other end of the second connecting pipe (8) is connected to the reserved flange of the on-load tap-changer oil conservator (6); the first connecting pipe (2) is also connected to the T-shaped pipeline (3) through a flange, the third end of the T-shaped pipeline (3) is connected to the valve (4) through a flange, and the other end of the valve (4) is connected to the pressure sensor electronic tag bolt (5) through a flange; the pressure sensor electronic tag bolt (5) includes: a metal plate (51), a metal expander (52), a spring (53), a bolt thread (54), a bolt nut (55) and an electronic tag (56); the metal plate (51) is pasted on the top plane of the metal expander (52) through double-sided tape, and the bottom end of the metal expander (52) is connected to one side of the bolt nut (55); the spring (53) is pasted and fixed to the lower part of the metal plate (51) through double-sided tape at its upper end, and the lower end of the spring (53) is pasted on the upper part of the electronic tag (56); the electronic tag (56) is connected to one side of the bolt nut (55); the electronic tag (56) is in the shape of a circular sheet, and the cross-section is trapezoidal; the electronic tag (56) includes: a metal layer (561), a resin layer (562), a buffer layer (563), a circuit layer (564) and a protective layer (565); the metal layer (561) and the resin layer (562) are connected by pouring; the buffer layer (563), the circuit layer (564) and the protective layer (565) are sequentially pasted together by hot melt adhesive; the metal layer (561) selects 304 stainless steel material; the resin layer (562) selects polyester resin material; the buffer layer (563) selects foam material; the circuit layer (564) selects Printed Circuit Board; the protective layer (565) selects polyester resin material; the structure or shape of the metal layer (561) is a circular sheet, and the cross-section is trapezoidal; the resin layer (562), the buffer layer (563), the circuit layer (564) and the protective layer (565) are in the shape of a circular sheet, and the cross-section is trapezoidal; the metal layer (561), the resin layer (562) and the three layers are pasted together by hot melt adhesive; the circuit layer (564) includes: an ultra-high frequency radio frequency antenna (5641), an ultra-high frequency automatically adjustable and matchable chip (5642) and a battery (5643);The ultra-high frequency RF antenna (5641) is connected to the ultra-high frequency automatically adjustable and matchable chip (5642), and the ultra-high frequency automatically adjustable and matchable chip (5642) is connected to the battery (5643); the ultra-high frequency automatically adjustable and matchable chip (5642) can store an identity identifier.

2. A pressure monitoring method for the oil chamber of an on-load tap-changer, characterized in that: It includes the following steps: Step 1: Write the identity identification information and impedance value-pressure value parsing program of the pressure sensor electronic tag bolt into the ultra-high frequency automatically adjustable and matchable chip and the intelligent terminal respectively; Step 2: Start the intelligent terminal and read the information of the pressure sensor electronic tag bolt; Step 3: When the identity identification of the ultra-high frequency automatically adjustable and matchable chip is consistent with that of the intelligent terminal, the pressure value of the ultra-high frequency automatically adjustable and matchable chip returns the impedance value to the intelligent terminal through the ultra-high frequency radio frequency antenna; Step 4: The intelligent terminal parses the pressure value of the oil chamber of the on-load tap-changer for reference.

3. The pressure monitoring method for the oil chamber of an on-load tap-changer according to claim 2, characterized in that: In step 1, before the installation of the pressure sensor electronic tag bolt, the unique identity identification of the pressure sensor electronic tag bolt is written into the ultra-high frequency automatically adjustable and matchable chip of the pressure sensor electronic tag bolt through the intelligent terminal, and the ultra-high frequency automatically adjustable and matchable chip has the function of storing the identity identification; the intelligent terminal is pre-written with the parsing program of the impedance value and pressure value of the pressure sensor electronic tag bolt; In step 2, when the operation and maintenance personnel patrol near the on-load tap-changer of the transformer, the intelligent terminal emits energy, and when the pressure sensor electronic tag bolt receives the energy, it is enabled; In step 3, when the pressure sensor electronic tag bolt reads that the identity identification written into the ultra-high frequency automatically adjustable and matchable chip before installation is consistent with the identity identification searched by the intelligent terminal, the pressure value of the ultra-high frequency automatically adjustable and matchable chip returns the impedance value to the intelligent terminal through the ultra-high frequency radio frequency antenna; In step 4, the intelligent terminal parses the pressure value of the oil chamber of the on-load tap-changer through the pre-written corresponding relationship between the impedance value and the pressure value, and reads the pressure value of the oil chamber of the on-load tap-changer from the intelligent terminal for making maintenance decision-making.

4. The pressure monitoring method for the oil chamber of an on-load tap-changer according to claim 2, characterized in that: When the oil pressure in the oil chamber of the on-load tap-changer changes, the metal expander is compressed or expanded with the change of the oil pressure, and the position of the metal plate relative to the ultra-high frequency radio frequency antenna also changes accordingly, and the impedance value of the ultra-high frequency radio frequency antenna also changes accordingly, causing the impedance matching imbalance between it and the ultra-high frequency automatically adjustable and matchable chip, resulting in the ultra-high frequency automatically adjustable and matchable chip automatically adjusting its impedance value until it matches and balances with the impedance value of the ultra-high frequency radio frequency antenna; When the oil pressure in the oil chamber of the on-load tap-changer changes, the position of the metal plate relative to the ultra-high frequency radio frequency antenna changes, and the impedance values matched by the ultra-high frequency automatically adjustable and matchable chips are different. Each impedance value of the ultra-high frequency automatically adjustable and matchable chip corresponds to a unique pressure value of the oil chamber of the on-load tap-changer; according to the given curve graph of the corresponding relationship between the impedance value and the pressure value of the ultra-high frequency automatically adjustable and matchable chip, the intelligent terminal reads the pressure value of the oil chamber of the on-load tap-changer. The high-frequency RF antenna receives the signal transmitted by the intelligent terminal and transmits it to the ultra-high-frequency automatically adjustable and matchable chip; according to the instruction of the intelligent terminal, the high-frequency RF antenna transmits the information in the ultra-high-frequency automatically adjustable and matchable chip. The intelligent terminal receives the signal transmitted by the high-frequency RF antenna and analyzes the pressure value corresponding to the impedance value of the ultra-high-frequency automatically adjustable and matchable chip, that is, the pressure value of the on-load tap-changer oil chamber.

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