KR200267879Y1 - Electrical penetraition assemblies - Google Patents

Abstract

The present invention relates to an assembly of electric through parts for supplying medium voltage power required to operate a reactor coolant pump motor in a reactor through a concrete containment wall of a nuclear power plant. More specifically, the coolant pump motor is started. It has semi-permanent reliability by providing electrical and mechanical safety for normal operation, and endures longitudinal and lateral forces generated from thermal effects of conductors due to overcurrent generated when starting coolant pump motor. The present invention relates to an electrical through-assembly assembly in which a pressure boundary is maintained to maximize device life and safety.

The solution of the present invention is applied to the cable applied to the inside of the electrical through-assembly assembly and the insulation material proved to be reliable, and applied only a part of the exposed part connected to the field cable as a single wire as a polymer It is designed to be connected and crimped inside the material bushing so as to absorb the elongation of the conductor due to the thermal effect generated when starting the coolant pump motor.

The bushing of the existing ceramic material is made of polymer material with excellent radiation resistance, heat resistance, impact resistance, and withstand voltage characteristics to maximize safety and reliability, and it is configured to fundamentally prevent leakage by applying O-ring to maintain pressure. And

It is made of existing welding structure to improve the difficulty of manufacturing and installation, making it the minimum welding structure, and easy assembly and disassembly in case of emergency by applying Hurenji assembly method to apply plural O-rings that have proven stability and reliability. The structure was improved.

Description

ELECTRICAL PENETRAITION ASSEMBLIES

The present invention relates to an assembly of electrical penetrations for supplying power required to operate a reactor coolant pump motor in a reactor through a concrete containment wall of a nuclear power plant. More specifically, the coolant pump motor is started and normal operation is performed. It has semi-permanent reliability by providing electrical and mechanical safety so that it can endure the longitudinal and transverse forces generated from the thermal effect of the conductor by the overcurrent generated when the coolant pump motor is started. It is related to the electrical through-assembly assembly is maintained to maximize the device life and safety.

Generally in nuclear power plants, pump motors are provided for circulating reactor coolant.

In order to supply the medium voltage power required to operate such a reactor coolant pump motor, a nuclear power plant passes through a concrete containment wall, and an electrical through assembly is installed.

Such an electrical through-assembly assembly is provided with one or more conductors, and should have electrical and mechanical safety so as to operate the coolant pump motor normally, and have semi-permanent reliability.

In particular, it must be designed to withstand the longitudinal and transverse forces due to the thermal effects of the conductors from the overcurrent generated when starting the coolant pump motor, and maintain a constant pressure boundary at all times.

This conventional electrical through-assembly assembly is disclosed in US Pat. No. 3,856,983.

The U.S. Patent No. 3,856,983 has a structure in which the conductor is extended in the longitudinal direction by a thermal effect generated when the coolant pump motor is started as a single-wire and transmits a considerable force, and as a complementary measure for the longitudinal extension of the ceramic bushing Bellows-type telescopic part is made of stainless steel at the bottom of the assembly part.

However, it is formed in a structure that is fused to the outer surface of the ceramic (magnetic material) to give continuous fatigue to the welded portion has an instability due to long-term use, due to the characteristics of the ceramic material is weak to vibration and shock due to the characteristics of the ceramic is less safety Had a structure.

The present invention has been researched and developed in order to effectively solve the disadvantages of the source technology as described above,

The object of the present invention is to apply the cable applied with the proven and reliable insulation material to the inside of the electrical through-assembly assembly, and to apply only the part exposed to the outside and connected to the field cable as the single wire inside the bushing of the polymer material. The present invention provides an assembly of an electrical through-section in which the coolant pump motor absorbs the elongation of the conductor due to the thermal effect generated during startup.

The purpose of the present invention is to maximize the safety and reliability of the existing ceramic (magnetic) bushing made of a polymer material with excellent radiation resistance, heat resistance, impact resistance, and voltage resistance. In providing a penetrating assembly.

An object of the present invention is to provide an electrical through-assembly assembly that can prevent leakage by maintaining the airtight by the O-ring in the pressure boundary portion to maintain a constant pressure.

The purpose of the present invention is to improve the difficulty of fabrication and installation by the existing welding structure, to apply the minimum welding structure, and to apply the flange assembly method applying a plurality of O-rings to maximize airtightness and to easily disassemble and assemble in case of emergency. It is to provide an electrical through assembly.

The above object of the present invention is provided with a tubular sleeve penetrating through the reactor concrete containment wall, the outer surface of the welding flange is welded with the tubular sleeve, the front plate and two O-rings are applied to the welded flange and To prevent gas leakage from the inside,

The front and back plates are welded with tubular pipes to close them to maintain pressure, and inside the tubular pipes there are internal circular pipes through which the conductors can pass, allowing the conductors to pass through and O-rings on the front and back plates. The applied polymer bushing is applied to maintain the secondary sealing state, and is achieved by the assembly of the electrical through-holes to provide the perfect sealing by using two ferrules in the exposed part of the conductor.

In addition, the present invention is to apply a plurality of stranded wires inside the wire and to effectively cope with the elongation and contraction caused by the thermal change by the current, and to the outside of the primary insulation layer, which has proven reliability, By having a semiconducting layer on the outside and a secondary insulating layer on the outside of the semiconducting layer to have the characteristics of improving the grounding characteristics and excellent elasticity and responsiveness, and by the electrical through-assembly assembly having the seismic characteristics by applying the polymer bushing Is achieved.

1 is a central longitudinal cross-sectional view of an electrical through-assembly assembly incorporating the present invention, a state diagram mounted on the reactor concrete containment wall,

Figure 2 is an enlarged view of the left portion of Figure 1,

Figure 3 is an enlarged view of the excerpt of the right part of Figure 1,

4 is a left side view showing an outer portion of the present invention,

5 is a right side view showing an inner part of the present invention,

Figure 6 is an enlarged front cutaway view showing the wire assembly of the present invention,

7 is an enlarged cross-sectional view taken along the line A-A of FIG.

8 and 9 is an enlarged view of a part of the extract of FIG.

Figure 10 is an enlarged view of the "F" portion of Figure 7

11 is an enlarged longitudinal sectional view of the branch valve taken from the "G" part of FIG.

<Description of Symbols for Major Parts of Drawings>

4: front panel 5: rear panel

6: cylinder tube 7, 25: conduit

8: guide bush 12: polymer bushing

20: conductive metal rod 36: branch valve

81, 87: wire assembly 90: gas monitoring system

Hereinafter, the configuration of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

That is, as shown in the accompanying drawings, Figures 1 to 11, the electrical through-assembly assembly of the present invention is denoted by 80.

This electrical through-assembly assembly 80 is mounted to a concrete wall 1 that forms part of the reactor facility.

The concrete wall 1 passes through and extends a certain length of cylindrical metal tube 2, known as a sleeve, so as to be mounted in a sealed state on the wall, and flanges 3 and 78 are welded on opposite sides.

In the sleeve 2 an electrical through-assembly assembly 80 is arranged and extends through the sleeve 2.

The electrical through-assembly assembly 80 has a front plate 4 at the left end, and another rear plate 5 at the right end, with both ends of the cylinder tube 6 interposed therebetween in the middle of the front plate. The part 9 and the back plate welding part 24 are welded to form a sealed container T, and the wire assembly 81 extends through the sealed container.

The wire assembly 81 may be provided in an appropriate number depending on the application, but in the embodiment of the present invention shown in the drawings, three wire assemblies are arranged at equal distances in the circumferential direction.

That is, the wire assembly 81 is disposed in three identical holes 82 penetrating the front plate 4 and holes 83 that coincide with the holes and penetrate the rear plate 5.

The wire assembly 81 is disposed in the pair of holes 82 and 83 described above, and this arrangement is the same in the front and back plates 4 and 5 for each of the other wire assemblies. Only one set of elements on 4) will be described, and this description is the same as the description of the wire assembly 81 on the back plate 5.

The guide bush 8 has a structure in which the conduit 7 is assembled by assembling and welding the assembly screw hole processed in the front plate 4 and the assembly screw hole processed in the back plate 5.

The guide bush has a diameter expansion head which can be screwed into the hole 82 with a rotary tool such as a spanner (not shown) and then welded into place by the annular welding member 84. At the right end, a conduit 7 made of a conductive metal such as stainless steel is assembled.

The conduit 7 extends from the guide bush 8 on the left side of the front plate 4 to the guide bush 8 on the right side of the rear plate 5 side, and in the middle of the length, each conduit 7 is a cylinder. It is supported and welded by a support plate 10 extending transversely in the vertical direction to the inner wall of the tube 6, and both ends of the conduit 7 slide in the guide bushes 8 on both sides.

As shown in FIG. 6, the wire assembly 81 is a wire assembly including multiple strands of conductive metal such as copper, and a semiconducting layer 47 is formed in the outermost outer insulating material 48. An inner insulating material 46 is formed inside the entire layer to provide a stranded wire 45 therein, and both ends of the conductive wire 45 are formed by drilling holes in the diameter-diameter head 20a of the conductive metal rod 20 such as copper. It is inserted into each of the conduits (7) in a state of being inserted and crimped to the outside.

In order to support the wire assembly 81 coaxially in the conduit 7 in a radially spaced state, the wire assembly 81 may be formed of an appropriate insulating material on the outside of the conductor 45, as described in FIG. 6. It should be enclosed and provided with a semiconductive layer 47 up to the assembled portion of the guide bush 8 at both ends, and is assembled closely with the conduit 7 in the longitudinal direction of the conduit 7.

7 and 10 show a means for mounting the wire assembly 81.

The left end portion of the wire assembly 81 is the same as the right end portion, and the wire assembly 81 portion inserted into the conduit 7 extends on the inner side of the guide bush 8 portion welded to the front plate 4. The conductive ring 49 is mounted and connected to the stainless steel front plate 4 in case of short circuiting of the conductive wire to provide a shorting path to ground.

The outer surface of the wire assembly 81 protruding to the left side of the front plate 4 is equipped with a polymer bushing 12 to maintain the insulation distance from the outside, and also the separation distance and leakage distance between the ground and the conductive part Secure.

That is, the polymer bushing 12 is provided with O-rings 50 and 51 on the inner surface of the assembling hole provided in the front plate 4, and the flange 12a is hexagonal in a state where the right end portion 12b is fitted. The bolts 17 and the backing ring 16 are tightly assembled to the front plate 4 to hold the seal.

In addition, the left end portion 12c of the polymer bushing 12 protects the crimping portion 85 of the diameter-diameter head 20a of the conductive metal rod 20 of the terminal portion of the wire assembly 81, and the nitrogen gas filled therein. The cap 52 of the same material is screwed through the O-ring 55 in the stainless steel cap 13 so that there is no leakage of the cap 13, and the cap 13 is the O-ring 53. Is mounted and inserted into the inner surface of the polymer bushing 12 and screwed to the outer surface via the O-ring 54 on the inner side to maintain the seal as the O-rings 53, 54, 55 so that the polymer bushing 12 The inner and outer surfaces of the left end portion 12c of the side wall are simultaneously sealed.

At this time, the front ferrule 65 and the back ferrule 66 are closely adhered to the left end of the cap 13 in order to prevent leakage to the surface of the conductive metal rod 20 penetrating and extending through the cap 13. And the cap 14 of the stainless material was screwed to the cap 13 to maintain the sealing.

In addition, the conductive parts of the conductive metal rod 20 of the wire assembly 81, 86 and the terminal portion of the polymer bushing 12 is the heat shrinkage of the specified designation, except for the portion where the connection terminal 21 is assembled after the assembly is completed The tube 22 is mounted to maintain insulation and to completely prevent leakage of the filled nitrogen gas.

Therefore, the cable assembly can elastically cope with the transverse and longitudinal directions in the inner side of the polymer bushing 12 in the state of perfect sealing as seen from the end of the wire assembly 81. It is possible to absorb sufficient vibration and shock due to the material properties to realize safety.

In addition, the insulation reinforcing plate 23 is assembled at the end of each wire assembly 81 and the heat shrink tube 18, 19 is constructed to minimize the flow of the wire assembly 81.

Meanwhile, the low voltage wire assembly 87 passing through the front plate 4 and the back plate 5 will be described with reference to FIG. 7.

That is, the low-pressure wire assembly 87 is a low-pressure wire 26 is coated with an insulating film is passed through the interior of the sealant 56 of the polymer material is inserted into the conduit 25 of the stainless material As the structure, the wire 26, the sealant 56, the conduit 25 is filled with nitrogen gas to form a pressure boundary therein to be crimped in the compression sealing method 57 by a die to form a safe sealing structure.

The wire assembly 87 is a silver plated front ferrule 59, an intermediate ferrule 60, to prevent the adhesion of stainless steel to the holes 88 processed to match the front plate 4 and the rear plate 5, The back ferrule 61 is inserted and tightly assembled by screwing the assembly cap 58 made of stainless steel so that it is assembled safely and firmly so that leakage of nitrogen gas filled in the sealed container T does not occur. .

That is, the front ferrule (59), the intermediate ferrule (60), the back ferrule (61) maintains the sealing while applying pressure to each other in the form of a spring by pushing the assembly cap (58), the vibration and The assembly cap 58 is prevented from loosening due to the impact.

As shown in FIG. 1, the front plate 4, the cylinder tube 6, and the back plate 5 are configured in the shape of a sealed container T as the weld 9 and the weld 24.

Such a sealed container (T) forms a chamber in which nitrogen gas is filled at a constant pressure of about 57 pounds / square inch.

The gas (nitrogen gas) is a portion in which the intermediate voltage wire assembly 81 is assembled to the front plate 4, the rear plate 5, and a portion in which the low voltage wire assembly 87 is assembled in the above-described manner, It is to be provided with a gas leakage monitoring system 90 that can be confirmed that the leak occurs because the sealing valve is properly maintained and acts at a certain pressure, such as the branch valve 30 is assembled.

As shown in FIG. 4, each of the wire assemblies 81 and 87, that is, the medium low pressure wire assembly 81, the low pressure wire assembly 87, the temperature sensor 77, and the branch valve are provided on the front plate 4. (36) and the like, so that the nitrogen gas filled in the sealed container (T) is filled through each of the wire assemblies, the temperature sensor (77), the branch valve (36), and the like. And, this is to be confirmed in the gas leakage monitoring system 90 in case of leakage in each assembly.

The gas leakage monitoring system 90 allows the pipe 30 to be assembled to the front plate 4 by using the cap 29, the front ferrule 63, and the back ferrule 64, and the pipe 30 is assembled. Branched from the T-shaped tube 31 through one is composed of a known pressure gauge 33 and the valve 35 attached to the gas filling and removal through the T-shaped tube 34, branched from the T-shaped tube 31 The other part was attached to the pressure switch 32 so that it can be checked above and below the set pressure, and has a function to connect to the central control panel (not shown) to make an alarm sound.

As shown in FIG. 11, the role of the branch valve 36 is to apply O-rings 43 and 44 to the welding flange 3 mounted on the front plate 4 and the concrete containment wall 1 of the nuclear power plant. The mounting bolts 37 are assembled to each of the nuts 39 for installation inserted into the welding flange 3 by bolting using a spring washer 38, and the branch valve 36 is opened to open the O-ring 43, By filling the nitrogen gas up to the portion 44, it is possible to monitor whether the gas leakage monitoring system 90 leaks, and each end portion of the nitrogen gas filling pipe 28 is connected to the plug bolt 40 by an O-ring ( 41) is applied to seal the structure.

The branch valve 36 passes through the conduit 69 between the O-rings 43 and 44 by the filling conduit 28 of the front plate 4, and passes through the valve seat 73 of the conduit valve rod 70. The O-ring 72 attached to the circumferential surface is opened and closed forward and backward by screw rotation in a state in which airtightness is maintained outside.

Meanwhile, the exposed conductors 20 and 26 of the wire assemblies 81 and 87 are provided with connectors 21 and 27 so as to easily connect with a connection cable in the field.

As described above in detail, the present invention proposes a method of minimizing the longitudinal change between adjacent conductors 45 to provide a short-circuit path to ground rather than from one conductor to another, and the wire assembly 81 The conduit (7) inserted into the inner side is electrically connected through the guide bush (8) welded at both ends of the front plate (4) and the back plate (5) and the ring (49) of conductive material assembled inside the guide bush. Since the front plate 4 is connected to the ground, a short circuit current flows to the ground at the time of short-circuit to prevent short-circuit to other conductors, thereby protecting the entire assembly.

If the wire assembly 81 needs to be replaced after the electrical through-assembly assembly is installed, it may be carried out on-site in the following manner.

That is, the heat shrink tubes 18 and 19 are removed from the wire assembly 81 to be replaced by the front plate 4 and the rear plate 5, the insulation reinforcing plate 23 is removed, and the heat shrink tube 22 is then removed. Remove the cap 14 by turning the screw, remove the front ferrule 65, the back ferrule 66 freely and then remove the stainless steel cap 13 by rotating.

In this state, the hexagon socket head bolts 17 are loosened to remove the backup ring 16 and the polymer bushing 12, and then the wire assembly 81 is pulled out in the axial direction to separate them.

In this state, the wire assembly 81 to be replaced is prepared and inserted into the through conduit 7 to assemble the polymer bushing 12 and the backup ring 16, and the front ferrule 65 and the back ferrule 66 are capped. Assemble using (14).

In this assembled state, the heat shrink tube 22 may be constructed, the insulation reinforcing plate 23 may be assembled, and the heat shrink tube 18 and 19 may be installed to complete the replacement and attach the connector 21 to the terminal unit. .

It is apparent that the embodiments of the present invention illustrated and described as described above can accomplish many purposes.

As described in detail above, the present invention is an assembly of electric through parts suitable for power supply, and fundamentally solved the leakage prevention against gas leakage, and adapted to the extension and contraction of the wire by thermal effects, and to vibration and shock resistance. With excellent characteristics, semi-permanent safety is secured,

It improves the grounding characteristics due to short circuit accidents, so that the movement of the conductor in the transverse direction can be minimized, so that the safety of the installation and disassembly and assembly can be easily replaced in the field while considering safety.

Claims (12)

Conduits (7) and (25), which are mounted on the concrete wall (1) of the nuclear reactor and can be assembled with wire assemblies (81) and (87) for supplying power for medium voltage or low pressure, are provided at both ends. In the electrical through-assembly assembly (80) composed of a sealed container (T) formed by welding the back plate (4) (5) with a cylinder tube (6), The wire assembly 81 applies a twisted pair cable, and both terminal portions are compressed and assembled by single wire, and both ends thereof are sealed by applying an insulating polymer bushing 12, and the terminal portions are sealed by a plurality of caps and a plurality of parallels. An electric through-collecting assembly having a function of maintaining a constant pressure of nitrogen gas filled in the inside of the container (T) and being sensed by the gas leakage monitoring system (90). The method of claim 1, The wire assembly 81 is a cable having multiple strands of copper material therein, and a semiconducting layer 47 is formed in the outermost outer insulating material 48, and the inner insulating material 46 is formed inside the semiconducting layer. The conductive wire 45 is provided, and both ends of the conductive wire 45 are processed by inserting holes into the diameter-diameter head 20a of the conductive metal rod 20 such as copper, and crimping the outside. The electrical through-assembly assembly, characterized in that it has a structure inserted into the interior. The method according to claim 1 or 2, The left end portion or the right end portion of the wire assembly 81 is inserted into the conduit 7 until the assembled portion of the guide bush 8 welded to the front plate 4 or the back plate 5. A semiconducting layer 47 is provided, and a conductive ring 49 is mounted on the inner side of the guide bush 8 and connected to the front plate 4 or the rear plate 5 in case one of them shorts. And an electrical through-section assembly having a structure that becomes a ground. The method of claim 1, The polymer bushing 12 is provided with O-rings 50 and 51 on the inner surface of the assembling hole provided in the front plate 4, and the flange 12a is attached to the flange 12a in a state where the right end portion 12b is fitted. The through-hole assembly is characterized in that the sealing is maintained on the front plate (4) by the bolt (17) and the backing ring (16) and has a structure that is removable. The method according to claim 1 or 4, The left end portion 12c of the polymer bushing 12 protects the crimping portion 85 of the diameter-diameter head 20a of the conductive metal rod 20 of the terminal portion of the wire assembly 81 and has a nitrogen gas as a filler therein. In order to prevent leakage, the cap 52 of the same material is screwed together with the O-ring 55 interposed therebetween, and the cap 13 has the O-ring 53 with the cap 52. A polymer bushing 12 is mounted on the inner surface of the polymer bushing 12 so as to be screw-assembled to an outer surface via an O-ring 54 to maintain the seal as the O-rings 53, 54, and 55. The front ferrule at the left end of the cap 13 to seal at the same time the inner and outer surfaces of the left end 12c of the front end and prevent leakage to the surface of the conductive metal rod 20 extending through and extending through the cap 13. The 65 and the back ferrule 66 are brought into close contact with each other, and the cap 14 made of stainless steel is screwed into the cap 13 to seal the seal. An electrical through-assembly assembly comprising a retained structure. The method of claim 1, The low-voltage wire assembly 87 is a low-pressure wire 26 is coated with an insulating film is passed through the interior of the sealant 56 of the polymer material is inserted into the conduit 25 of the stainless material, usually An electric through-assembly assembly formed by crimping and sealing in a crimping seal (57) method by means of a die. The method of claim 6, The wire assembly 87 is a silver plated front ferrule (59), intermediate ferrule (60), for preventing the adhesion of stainless steel to the holes (88) processed to match the front plate (4) and the back plate (5), A back ferrule (61) is inserted into the electrical through-assembly assembly characterized in that it is made of a structure that is tightly assembled and sealed by screwing the assembly cap (58) made of stainless steel. The method of claim 1, The front plate 4 comprises a temperature sensor 77 in a state where the inside of the sealed container T and the airtightness is maintained, so that the temperature inside the sealed container T can be measured. Sub-assembly. The method of claim 1, The front plate 4 is equipped with a branch valve 36 in addition to the respective wire assembly 81, 87 and the temperature sensor 77, the filling line 28 formed in the front plate (4) Nitrogen gas is filled in the airtight container (T) through the leaking or internal pressure drop in each assembly of the wire assembly (81) (87), the temperature sensor (77), the branch valve (36). The electrical through-assembly assembly, characterized in that configured to be confirmed from the outside by the gas leakage feeling system (90) that is addressed to the sealed container (T). The method of claim 9, The gas monitoring system 90 allows the pipe 30 to be assembled to the front plate 4 using the cap 29, the front ferrule 63, and the back ferrule 64, and through the pipe 30. Branched from the T-shaped tube 31, one is composed of a valve 35 attached to the gas filling and removal through a known pressure gauge 33 and T-shaped tube 34, branched from the T-shaped tube 31 The other part is attached to the pressure gauge 32 so that the pressure drop at the set pressure can be confirmed, and connected to the central control panel, the electrical through-assembly assembly characterized in that it has the function to make an alarm sound. The method of claim 9, The branch valve 36 is applied to the welding flange 3 by applying O-rings 43 and 44 to the welding flange 3 mounted on the front plate 4 and the concrete containment wall 1 of the nuclear power plant. After assembling the mounting bolt 37 to each inserted insert nut 39 using a spring washer 38, tighten the bolt and then open the branch valve 36 to fill nitrogen gas to the O-rings 43 and 44. It is possible to monitor whether the leakage in the gas leakage monitoring system 90, and each end portion of the nitrogen gas filling pipe 28 is sealed by applying the O-ring 41 to the plug bolt (40) The electrical through-section assembly having a. The method of claim 11, The branch valve 36 passes through the conduit 69 between the O-rings 43 and 44 by the filling conduit 28 of the front plate 4, and passes through the valve seat 73 of the conduit valve rod 70. An electric through-assembly assembly, which is configured to open and close forward and backward by screw rotation in a state in which airtightness is maintained by the O-ring 72 mounted on the circumferential surface.