Device for monitoring internal magnetic flux of oil-filled equipment and installation method thereof

Abstract

The invention discloses an internal magnetic flux monitoring device for oil-filled equipment and an installation method thereof, and belongs to the technical field of internal performance monitoring of the oil-filled equipment, the internal magnetic flux monitoring device comprises a plurality of optical fiber probes, an optical fiber, a first fixing mechanism, a second fixing mechanism, a leading-out mechanism, an optical fiber penetrating disc and a signal receiving mechanism, the optical fiber probes are mounted on coils in the oil-filled equipment, each optical fiber probe is connected with an optical fiber, one end, not connected with the optical fiber probe, of each optical fiber penetrates through the optical fiber penetrating disc to be connected to the signal receiving mechanism, and the optical fiber penetrating disc is arranged on the surface of the oil-filled equipment; the first fixing mechanism fixes the optical fiber probe, the optical fiber is wound and wired on the leading-out mechanism, the bending radius of the optical fiber is larger than or equal to 35 mm, the leading-out mechanism is located on the outermost side of the coil, and the second fixing mechanism fixes the optical fiber on the leading-out mechanism; the internal performance is monitored through the optical fiber probe, the optical fiber is prevented from being broken through the leading-out mechanism, and the problem of single monitoring content is solved.

Description

Technical Field

[0001] The invention relates to an internal magnetic flux monitoring device of oil filling equipment and an installation method thereof, belonging to the technical field of internal performance monitoring of oil filling equipment. Background Art

[0002] In recent years, several explosion accidents have occurred in the converter transformers of some UHV DC converter stations during operation, which has attracted great attention from all parties and exposed that the electrical and non-electrical protection of the existing converter transformers is difficult to quickly and timely remove the early faults inside the converter transformers and prevent the spread of faults. In order to avoid the occurrence of transformer oil tank rupture accidents, while focusing on improving the sensitivity and rapidity of relay protection measures, considering the development process of internal transformer faults, it is more effective to quickly identify and remove them in the early stage of the fault, so as to ensure the safe and stable operation of the DC transmission system and avoid major economic losses and safety accidents.

[0003] At present, large-scale oil-filling equipment is widely equipped with gas relays, thermostats, pressure relief valves and other components for monitoring and protection, and has achieved good results. However, the internal electromagnetic field environment of live oil-filling equipment is complex, and there are many operating conditions. The monitoring content of the above components is relatively simple, and it is impossible to directly extract the magnetic flux inside the transformer when a fault occurs through sensors, so it is impossible to achieve real-time monitoring of the internal magnetic flux. Summary of the invention

[0004] The purpose of the present invention is to provide an internal magnetic flux monitoring device for oil-filled equipment and an installation method thereof, so as to solve the problem in the prior art that real-time monitoring of the internal magnetic flux cannot be achieved.

[0005] To achieve the above objectives, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a device for monitoring magnetic flux inside an oil-filled device, comprising a fiber optic probe, an optical fiber, a first fixing mechanism, a second fixing mechanism, a lead-out mechanism, an optical fiber through-disk, and a signal receiving and processing mechanism. The fiber optic probe is provided in plurality and is installed on each coil in the oil-filled device. Each fiber optic probe is connected to an optical fiber. The end of the optical fiber not connected to the fiber optic probe passes through the optical fiber through-disk and is connected to the signal receiving mechanism. The fiber optic probe converts the measured electromagnetic field inside the oil-filled device into an optical signal and sends it to the signal receiving and processing mechanism through the optical fiber. The optical fiber through-disk is arranged on the surface of the oil-filled device. The first fixing mechanism fixes the optical fiber probe at its installation position, the optical fiber is wound and wired on the lead-out mechanism, the bending radius of the optical fiber is not less than 35 mm, the lead-out mechanism is located at the outermost side of the coil, and the second fixing mechanism fixes the optical fiber on the lead-out mechanism.

[0006] Furthermore, the first fixing mechanism includes a lower iron yoke optical fiber pad, which is arranged in the lower iron yoke insulation at the bottom of the coil, and a first fixing groove is opened on the lower iron yoke optical fiber pad, and the optical fiber probe installed in the lower iron yoke optical fiber pad is fixed in the first fixing groove.

[0007] Furthermore, the lower iron yoke optical fiber pad is made of high-density laminated cardboard with a thickness of 5 to 7 mm.

[0008] Furthermore, the first fixing mechanism includes a coil optical fiber gasket, which is arranged on the voltage regulating coil in the middle of the oil filling device, and is connected to the dovetail gasket in the middle of the voltage regulating coil. The coil optical fiber gasket is also connected to the gasket in the upper end ring of the oil filling device, and a second fixing groove is opened on the coil optical fiber gasket, and the optical fiber probe installed in the coil optical fiber gasket is fixed in the second fixing groove.

[0009] Furthermore, the material of the coil optical fiber pad is the same as the insulating material inside the oil-filled device.

[0010] Furthermore, the first fixing mechanism includes an upper iron yoke optical fiber pad, which is arranged in the upper iron yoke insulation on the upper part of the coil, and the upper iron yoke optical fiber pad is provided with a third fixing groove, and the optical fiber probe installed in the upper iron yoke optical fiber pad is fixed in the third fixing groove.

[0011] Furthermore, the upper iron yoke optical fiber pad is made of high-density laminated paperboard with a thickness of 5 to 7 mm.

[0012] Furthermore, the lead-out mechanism is a cylindrical insulating paperboard arranged around the coil, the lower part of the cylindrical insulating paperboard is fixed on the lower iron yoke insulation at the lower part of the coil, and the thickness of the cylindrical insulating paperboard is 1-2 mm.

[0013] Furthermore, the second fixing mechanism is a binding belt, and the second fixing mechanism also insulates and fixes the cylindrical insulating paperboard and the lower iron yoke together.

[0014] In a second aspect, the present invention provides a method for installing the internal magnetic flux monitoring device of the oil-filling equipment according to any one of the first aspects, comprising: Fixing the lower iron yoke optical fiber spacer in the lower iron yoke insulation at the lower part of the coil, and installing an optical fiber probe in the first fixing groove on the lower iron yoke optical fiber spacer; Fix the coil optical fiber pad in the dovetail pad in the voltage regulating coil, connect the coil optical fiber pad to the pad in the upper end ring of the oil filling device, and install an optical fiber probe in the second fixing groove on the coil optical fiber pad; Fix the upper iron yoke optical fiber spacer in the upper iron yoke insulation of the coil, and install an optical fiber probe in the third fixing groove on the upper iron yoke optical fiber spacer; Install the lead-out mechanism on the outermost side of the coil and fix it on the lower iron yoke insulation at the bottom of the coil; An optical fiber is led out from the output end of each optical fiber probe, and the led optical fiber is wound along the outer surface of the lead-out mechanism until it passes through the optical fiber through-disk and is connected to the signal receiving and processing mechanism. During the winding and wiring, the optical fiber is fixed to the lead-out mechanism by a second fixing mechanism.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: The present invention provides an internal magnetic flux monitoring device for oil-filling equipment and an installation method thereof. The optical fiber probe is installed on each coil inside the oil-filling equipment, and then the optical fiber is led out. When the optical fiber is led out, the optical fiber is wound on the lead-out mechanism for wiring, and the optical fiber is fixed to the lead-out mechanism by a second fixing mechanism. The lead-out mechanism is used to prevent the optical fiber from breaking due to its toughness problem, thereby ensuring the smooth transmission of internal signals and ensuring real-time monitoring of the internal magnetic flux of the oil-filling equipment, thereby solving the problem in the prior art that the internal magnetic flux cannot be directly monitored by sensors due to the complex internal electromagnetic field when monitoring the inside of the oil-filling equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a magnetic flux monitoring device inside an oil-filling device provided by an embodiment of the present invention; Figure 2 is a schematic diagram of the structure of an optical fiber probe and an optical fiber provided in an embodiment of the present invention; Figure 3 It is a structural schematic diagram of a lower iron yoke optical fiber spacer provided in an embodiment of the present invention; Figure 4 It is a structural schematic diagram of a coil optical fiber spacer provided in an embodiment of the present invention; Figure 5 It is a schematic structural diagram of an upper iron yoke optical fiber spacer provided in an embodiment of the present invention; Figure 6 is a schematic structural diagram of a lead-out mechanism and a second fixing mechanism provided in an embodiment of the present invention; Figure 7 is a schematic structural diagram of an optical fiber through-disk provided in an embodiment of the present invention; Figure 8 It is a structural schematic diagram of a first fixing mechanism provided in an embodiment of the present invention.

[0017] In the figure: 1. Oil filling equipment; 2. Fiber optic probe; 3. Optical fiber; 4. Lower iron yoke fiber optic pad; 5. Coil fiber optic pad; 6. Upper iron yoke fiber optic pad; 7. Lead-out mechanism; 8. Second fixing mechanism; 9. Fiber through-disc; 10. Lower iron yoke pad; 11. Upper iron yoke pad; 12. Dovetail pad; 13. Fiber optic connector. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the protection scope of the present invention.

[0019] Example 1.

[0020] The present invention provides a device for monitoring the internal magnetic flux of an oil-filling device, comprising a fiber optic probe, an optical fiber, a first fixing mechanism, a second fixing mechanism, a lead-out mechanism, a fiber optic through-disk and a signal receiving and processing mechanism. A plurality of fiber optic probes are provided, which are installed on respective coils in the oil-filling device. Each fiber optic probe is connected to an optical fiber. The internal magnetic flux of the oil-filling device is monitored by the fiber optic probe. The end of the optical fiber not connected to the fiber optic probe passes through the fiber optic through-disk and is connected to the signal receiving mechanism. The fiber optic through-disk is arranged on the surface of the oil-filling device. The first fixing mechanism fixes the optical fiber probe at its installation position, the optical fiber is wound and wired on the lead-out mechanism, the lead-out mechanism is located at the outermost side of the coil, and the second fixing mechanism fixes the optical fiber on the lead-out mechanism.

[0021] The optical fiber probe is installed on each coil inside the oil-filled device, and then the optical fiber is led out. When the optical fiber is led out, the optical fiber is wound on the lead-out mechanism, and the optical fiber is fixed to the lead-out mechanism by a second fixing mechanism. The lead-out mechanism is used to prevent the optical fiber from breaking due to its toughness problem, thereby ensuring the smooth transmission of internal signals and real-time monitoring of the magnetic flux inside the oil-filled device.

[0022] Example 2.

[0023] like Figure 1 As shown, the present invention provides a device for monitoring magnetic flux inside an oil-filled device, comprising an optical fiber probe 2, an optical fiber 3, a first fixing mechanism, a second fixing mechanism 8, a lead-out mechanism 7, an optical fiber through-disk 9 and a signal receiving and processing mechanism, which is installed on the oil-filled device 1.

[0024] The oil-filled equipment 1 can be a converter transformer, an ultra-high voltage AC transformer, a reactor, etc., which is the main equipment for the implementation of power projects. Generally, transformer oil is used as an insulating medium in the equipment. In this embodiment, the oil-filled equipment 1 is a converter transformer.

[0025] Optical fiber 3 connects optical fiber probe 2 and optical fiber through disk 9 on oil filling device 1 to transmit the signal. Optical fiber probe 2 is made of glass on the outside, and contains yttrium iron garnet crystal material, optical glass and optical glue. When oil filling device 1 is running, the signal sent by optical fiber probe 2, that is, the light source sends out a single-mode laser signal, which is processed by the optical path and modulated by the external magnetic field at optical fiber probe 2, and outputs a modulated single-mode laser signal; this signal only measures the magnetic field signal, and it depends on the difference in frequency components, and can reflect vibration (even harmonics) to a certain extent, and then monitor the internal electromagnetic field distribution of the converter transformer (that is, magnetic flux).

[0026] The structure of the optical fiber probe used in this embodiment is the structure disclosed in CN201610856075.9, including the laser driving and transmitting unit and the magneto-optical isolator.

[0027] The optical fiber 3 is a connecting component between the optical fiber probe 2 and the optical fiber through-disk 9. The optical fiber core is made of glass optical fiber (silicon dioxide) material, the outer coating layer is made of high-temperature resistant polyimide, and the outermost sheath is ordinary PVC, which is used for the transmission of test signals to ensure the accuracy of the test signal of the oil-filled device 1.

[0028] The structures of the optical probe 2 and the optical fiber 3 are as follows Figure 2 As shown, Ref is the size, Input is the input end, and Output is the output end.

[0029] The lower iron yoke fiber spacer 4 is placed in the lower iron yoke insulation. The lower iron yoke insulation is distributed in the lower part of the entire coil and is placed between the iron yoke spacer and the coil end ring. One piece per phase corresponds to the upper iron yoke insulation and serves as the main insulation material. The specific position is shown in Figure 8 , overlap and bond with the lower iron yoke pad 10 in the lower iron yoke insulation of the device body, and for fixing the optical fiber probe 2, grooves are made in the lower iron yoke pad 10 of the device body, and the lower iron yoke optical fiber pad 4 is embedded in the lower iron yoke pad 10 and then fixedly led out (such as Figure 3 The lower iron yoke optical fiber spacer 4 is made of 6mm high-density laminated paperboard, and a groove (first fixed groove) is made on the lower iron yoke optical fiber spacer 4 according to the size of the optical fiber 3 and the optical fiber probe 2.

[0030] like Figure 4As shown, the coil optical fiber pad 5 is located in the middle of the voltage regulating coil. The voltage regulating coil is in the middle of the device body, on the outermost side of the coil arrangement, and there is a screen cardboard (lead-out mechanism 7) on the outside. The coil is overlapped and led out in the dovetail pad 12 of the coil, and the coil optical fiber pad 6 is overlapped and led out with the pad in the upper end ring of the device body. First, it ensures that the optical fiber probe 2 is fixed reliably, and second, if the optical fiber probe 2 fails, it can be replaced during maintenance. The material of the coil optical fiber pad 5 needs to consider its compatibility with the insulating oil inside the equipment, that is, it will not interact with each other to produce chemical reactions and cause pollution to the insulating oil. The same insulating material as that inside the converter transformer is used.

[0031] The upper iron yoke fiber pad 6 is placed in the upper iron yoke insulation, and the specific position is shown in Figure 8. The upper iron yoke insulation is distributed on the upper part of the entire coil, placed between the iron yoke pad and the coil end ring, one piece per phase, corresponding to the lower iron yoke insulation, as the main insulation material. It is overlapped and bonded with the upper iron yoke pad 11 in the upper iron yoke insulation of the device body. In order to fix the optical fiber probe 2, the lead (such as Figure 5 The upper iron yoke optical fiber spacer 6 is made of high-density laminated paperboard, and a groove (third fixed groove) is made on the spacer according to the size of the optical fiber and the optical fiber probe.

[0032] like Figure 6 As shown, the lead-out mechanism 7 (screen cardboard) provides support for the lead-out path of the optical fiber probe 2 after it is led out through the optical fiber 3. The screen cardboard is placed on the outermost side of the coil, supported by the pads extending from the lower iron yoke, and tied with the second fixing mechanism 8 (binding belt) on the outside. Considering the toughness and bending radius of the optical fiber 3 material, after being led out from the optical fiber probe 2, it is led upward along the screen cardboard 7, and the screen cardboard is made of 1.5mm thick insulating cardboard.

[0033] The second fixing mechanism 8 (binding belt) is an essential material for fixing the screen paperboard 7 and the optical fiber 3, and is used to bind and fix the screen paperboard 7 and the optical fiber 3 firmly. The optical fiber is thin and easy to bend, so it is necessary to provide a lead-out path and fixing materials for it.

[0034] like Figure 7 As shown, the fiber optic through-disk 9 is connected to the fiber optic probe 2 through the optical fiber 3. The signal monitored by the fiber optic probe 2 is transmitted here, and then led out to the external fiber optic signal box (signal receiving mechanism) through the fiber optic through-disk 9. The fiber optic through-disk 9 is provided with a fiber optic connector 13 for connecting the optical fiber.

[0035] In summary, the entire internal monitoring device can be placed on the coil and body of the oil-filling equipment. The optical fiber probe 2 is installed on the internal body and coil of the oil-filling equipment 1, and is fixed by the lower iron yoke optical fiber pad 4, the coil optical fiber pad 5, and the upper iron yoke optical fiber pad 6. The three pads are all provided with installation slots for the optical fiber probe 2 (the first fixed slot, the second fixed slot, and the third fixed slot). The optical fiber probe 2 is bonded to the fixed pad with crepe paper and special glue, and the required monitoring signals are all sent out from it. The optical fiber 3 is connected to the optical fiber through-disk 9 along the body and the wire clamp through the screen cardboard 7 and the binding tape 8. During the binding and fixing process, it is noted that the bending radius of the optical fiber 3 is not less than 35 mm, and it is not allowed to be broken or stressed.

[0036] Example 3.

[0037] The present invention provides a method for installing the internal magnetic flux monitoring device of the oil-filling equipment provided in Embodiment 1, comprising: Fixing the lower iron yoke optical fiber spacer in the lower iron yoke insulation at the lower part of the coil, and installing an optical fiber probe in the first fixing groove on the lower iron yoke optical fiber spacer; Fix the coil optical fiber pad in the dovetail pad in the voltage regulating coil, connect the coil optical fiber pad to the pad in the upper end ring of the oil filling device, and install an optical fiber probe in the second fixing groove on the coil optical fiber pad; Fix the upper iron yoke optical fiber spacer in the upper iron yoke insulation of the coil, and install an optical fiber probe in the third fixing groove on the upper iron yoke optical fiber spacer; Install the lead-out mechanism on the outermost side of the coil and fix it on the lower iron yoke insulation at the bottom of the coil; An optical fiber is led out from the output end of each optical fiber probe, and the led optical fiber is wound along the outer surface of the lead-out mechanism until it passes through the optical fiber through-disk and is connected to the signal receiving and processing mechanism. During the winding and wiring, the optical fiber is fixed to the lead-out mechanism by a second fixing mechanism.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for monitoring magnetic flux inside oil-filled equipment, characterized in that: It includes a fiber optic probe, an optical fiber, a first fixing mechanism, a second fixing mechanism, a lead-out mechanism, an optical fiber through-disk and a signal receiving and processing mechanism. The optical fiber probe is provided in plurality and installed on each coil in the oil-filling device. Each optical fiber probe is connected to an optical fiber. The end of the optical fiber not connected to the optical fiber probe passes through the optical fiber through-disk and is connected to the signal receiving and processing mechanism. The optical fiber probe converts the measured magnetic flux inside the oil-filling device into an optical signal and sends it to the signal receiving and processing mechanism through the optical fiber. The optical fiber through-disk is arranged on the surface of the oil-filling device. The first fixing mechanism fixes the optical fiber probe at its installation position, the optical fiber is wound and wired on the lead-out mechanism, the bending radius of the optical fiber is not less than 35 mm, the lead-out mechanism is located at the outermost side of the coil, and the second fixing mechanism fixes the optical fiber on the lead-out mechanism.

2. The internal magnetic flux monitoring device of oil-filled equipment according to claim 1, characterized in that: The first fixing mechanism includes a lower iron yoke optical fiber pad, which is arranged in the lower iron yoke insulation at the bottom of the coil. A first fixing groove is opened on the lower iron yoke optical fiber pad, and the optical fiber probe installed in the lower iron yoke optical fiber pad is fixed in the first fixing groove.

3. The internal magnetic flux monitoring device of oil-filled equipment according to claim 2, characterized in that: The lower iron yoke optical fiber pad is made of high-density laminated paperboard with a thickness of 5-7 mm.

4. The internal magnetic flux monitoring device of oil-filled equipment according to claim 1, characterized in that: The first fixing mechanism includes a coil optical fiber gasket, which is arranged on the voltage regulating coil in the middle of the oil filling device. The coil optical fiber gasket is connected to the dovetail gasket in the middle of the voltage regulating coil. The coil optical fiber gasket is also connected to the gasket in the upper end ring of the oil filling device. A second fixing groove is opened on the coil optical fiber gasket, and the optical fiber probe installed in the coil optical fiber gasket is fixed in the second fixing groove.

5. The internal magnetic flux monitoring device of oil-filled equipment according to claim 4, characterized in that: The material of the coil optical fiber pad is the same as the insulating material inside the oil-filled device.

6. The internal magnetic flux monitoring device of oil-filled equipment according to claim 1, characterized in that: The first fixing mechanism includes an upper iron yoke optical fiber pad, which is arranged in the upper iron yoke insulation at the upper part of the coil. The upper iron yoke optical fiber pad is provided with a third fixing groove, and the optical fiber probe installed in the upper iron yoke optical fiber pad is fixed in the third fixing groove.

7. The internal magnetic flux monitoring device of oil-filled equipment according to claim 1, characterized in that: The upper iron yoke optical fiber pad is made of high-density laminated paperboard with a thickness of 5-7 mm.

8. The internal magnetic flux monitoring device of oil-filled equipment according to claim 1, characterized in that: The lead-out mechanism is a cylindrical insulating paperboard arranged around the coil, the lower part of the cylindrical insulating paperboard is fixed on the lower iron yoke insulation at the lower part of the coil, and the thickness of the cylindrical insulating paperboard is 1-2 mm.

9. The internal magnetic flux monitoring device of oil-filled equipment according to claim 8, characterized in that: The second fixing mechanism is a binding belt, and the second fixing mechanism also insulates and fixes the cylindrical insulating paperboard and the lower iron yoke together.

10. A method for installing the internal magnetic flux monitoring device of the oil-filled equipment according to any one of claims 1 to 9, comprising: Fixing the lower iron yoke optical fiber spacer in the lower iron yoke insulation at the lower part of the coil, and installing an optical fiber probe in the first fixing groove on the lower iron yoke optical fiber spacer; Fix the coil optical fiber pad in the dovetail pad in the voltage regulating coil, connect the coil optical fiber pad to the pad in the upper end ring of the oil filling device, and install an optical fiber probe in the second fixing groove on the coil optical fiber pad; Fix the upper iron yoke optical fiber spacer in the upper iron yoke insulation of the coil, and install an optical fiber probe in the third fixing groove on the upper iron yoke optical fiber spacer; Install the lead-out mechanism on the outermost side of the coil and fix it on the lower iron yoke insulation at the bottom of the coil; An optical fiber is led out from the output end of each optical fiber probe, and the led optical fiber is wound along the outer surface of the lead-out mechanism until it passes through the optical fiber through-disk and is connected to the signal receiving and processing mechanism. During the winding and wiring, the optical fiber is fixed to the lead-out mechanism by a second fixing mechanism.

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