High-strength, high-temperature and corrosion-resistant special thermocouple compensation cable for nuclear power plants

Abstract

The present application discloses a high-strength, high-temperature-resistant, and corrosion-resistant special thermocouple compensation cable for nuclear power plants, which includes an outer sheath, a total shielding layer, and a total wrapping layer from the outside to the inside, and the total wrapping layer includes two reinforcement units, and there are multiple cable core units between the two reinforcement units; the cable core unit includes an inner sheath, an outer sub-item shielding layer, an inner sub-item shielding layer, and an inner wrapping layer from the outside to the inside, and there are two wire cores in the inner wrapping layer. The thermocouple compensation cable of the present application has the characteristics of high temperature resistance, corrosion resistance, and anti-interference, and is suitable for the working environment of a nuclear power plant. The reinforcement unit increases the mechanical strength of the cable, so that the cable is pressure-resistant and not easy to deform when in use; multiple cable core units can be connected to multiple thermocouples, so that temperature can be collected at multiple locations at the same time, and the temperature sensor can detect whether the ambient temperature of the cable is abnormal, and the pressure sensor can detect whether the cable is deformed.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and more specifically to a high-strength, high-temperature-resistant and corrosion-resistant special thermocouple compensation cable for nuclear power plants. Background Art

[0002] Compensation cable refers to a pair of wires with an insulation layer that have the same nominal value of thermoelectric electromotive force as the thermocouple it matches within a certain temperature range. It is used to extend the wiring of the thermocouple temperature sensor, that is, to connect the thermocouple with the temperature display control instrument with compensation cable to compensate for the error caused by temperature changes at the connection with the thermocouple.

[0003] Existing compensating cables, especially in the working environment of nuclear power plants, are easily affected by external corrosion factors, which in turn affects the service life and use effect of the compensating cables. When the ambient temperature of the compensating cables is abnormal, it will have a greater impact on the temperature measurement, resulting in lower accuracy of thermocouple measurement. If the impact of ambient temperature on the thermocouple compensation cable is not considered, the measured temperature will deviate from the actual temperature. At the same time, in the actual use process, the compensating cable will inevitably be subject to external pressure, and the external force will easily cause the cable to deform, resulting in cable flattening, displacement of the internal structure, and inaccurate temperature measurement, which will cause great trouble to the measurement of thermocouples and pose certain safety hazards. In the working environment of nuclear power plants, due to the complex use environment, the use effect is difficult to meet the needs of the current actual working environment. Summary of the invention

[0004] The present invention aims to overcome the defects of the prior art and provide a high-strength, high-temperature-resistant and corrosion-resistant special thermocouple compensation cable for nuclear power plants.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a thermocouple compensation cable, comprising, from the outside to the inside, an outer sheath, a total shielding layer and a total wrapping layer, the total wrapping layer comprising two reinforcement units, a plurality of cable core units being arranged between the two reinforcement units, and the plurality of cable core units being arranged in a row; the cable core unit comprises, from the outside to the inside, an inner sheath, an outer sub-item shielding layer, an inner sub-item shielding layer and an inner wrapping layer, the inner wrapping layer comprising two wire cores, the wire core comprising an insulating layer and a conductor wrapped by the insulating layer.

[0006] Furthermore, among the two cores, the conductor of one core is a positive conductor, and the conductor of the other core is a negative conductor.

[0007] Furthermore, the reinforcement unit includes a plurality of installation positions, the number of installation positions of each reinforcement unit is equal to the number of the cable core units, and one cable core unit is installed between two installation positions corresponding to two reinforcement units; the installation position includes a receiving groove, the receiving groove has two embedding grooves, the inner sheath has four embedding protrusions that cooperate with the embedding grooves, one side of the inner sheath has a limiting groove, and the other side has a limiting rib that cooperates with the limiting groove, any two adjacent cable core units abut against each other, and the limiting rib of one cable core unit is inserted into the limiting groove of the other cable core unit.

[0008] The reinforcement unit increases the mechanical strength of the cable, so that the cable can withstand pressure and is not easily deformed. Through the cooperation of the limiting ribs and the limiting grooves, it plays a good limiting role on the cable core unit.

[0009] Furthermore, the end of the cross section of the limiting rib is semicircular; the end of the cross section of the limiting groove is semicircular.

[0010] This makes it easier for the limiting rib to be inserted into the limiting groove of the adjacent cable core unit.

[0011] Furthermore, the cross section of the accommodating groove is an equilateral right triangle, and the right angles are in an arc-shaped chamfered shape; both ends of the cross section of the inner protective layer are in a right-angled shape, and the right angles are in an arc-shaped chamfered shape.

[0012] This makes it easier for the cable core unit to be accommodated in the accommodating groove, and the arc-shaped chamfer protects the inner sheath.

[0013] Furthermore, the cross-section of the accommodating groove includes two straight sides that are perpendicular to each other, the two straight sides are connected by an arc-shaped side, and the two embedded grooves are respectively located at the positions corresponding to the two straight sides; the cross-section of the inner protective layer includes two first straight lines that are parallel to each other, two second straight lines that are parallel to each other, and two third straight lines that are parallel to each other, each first straight line is perpendicular to the second straight line adjacent to it, and the two are connected by an arc line, and the four embedded protrusions are respectively located at the positions corresponding to the two first straight lines and the two second straight lines; the position corresponding to one of the third straight lines has the limiting groove, and the position corresponding to the other third straight line has the limiting rib.

[0014] Furthermore, the reinforcement unit includes a reinforcement cladding and a skeleton unit wrapped by the reinforcement cladding, the reinforcement cladding is extruded from polyethylene or silicone rubber, the skeleton unit includes two side support units and a connecting unit connecting the two side support units, both ends of the reinforcement unit have abutment surfaces, the abutment surface of one reinforcement unit has a plurality of positioning recesses, and the abutment surface of the other reinforcement unit has a plurality of positioning protrusions that cooperate with the positioning recesses.

[0015] The cooperation between the positioning protrusion and the positioning recess facilitates the connection of the two reinforcement units, and the reinforcement sheath provides the cable with better high temperature resistance and corrosion resistance.

[0016] Furthermore, the inner sides of both ends of the reinforcement unit are provided with abutment protrusions with fan-shaped cross-sections capable of abutting the cable core unit, and the cross-section of each abutment protrusion and the cross-section of one abutment protrusion of another reinforcement unit are spliced ​​into a semicircle.

[0017] Thereby, the cable core unit located on the outside is abutted and fixed with the end of the reinforcement unit.

[0018] Furthermore, each cable core unit has two of the limiting ribs and two of the limiting grooves.

[0019] Thereby, the limiting effect on the cable core unit is better.

[0020] Furthermore, the abutting surfaces at both ends of the reinforcement unit are provided with mounting grooves, and each mounting groove and one mounting groove of another reinforcement unit are spliced ​​into a mounting channel, and the mounting channel includes a main channel and secondary channels located on both sides of the main channel and connected with the main channel; a mounting tube is installed in the mounting channel, and the mounting tube is spliced ​​by two half-tubes, and the half-tube includes two side plates located in the secondary channel and a middle connecting plate located in the main channel connecting the two side plates, the cross-section of the side plates is straight, and the cross-section of the middle connecting plate is arc-shaped; a base plate portion is fixed at the middle connecting plate of one of the two half-tubes, and a temperature sensor is installed at the base plate portion, and a step portion is provided at one of the side plates of one of the two half-tubes, and a pressure sensor is installed at the step portion.

[0021] Therefore, the temperature sensor can detect whether the ambient temperature of the cable is abnormal, and the pressure sensor can detect whether the cable is deformed, so that corresponding measures can be taken in time to avoid affecting the accuracy of thermocouple measurement due to cable deformation or abnormal external temperature.

[0022] Furthermore, the cross section of the main channel is circular; and the cross section of the secondary channel is rectangular.

[0023] Thus, the main channel matches the shape of the middle connecting plate, and the secondary channel matches the shape of the side plate.

[0024] Furthermore, the embedding groove and the embedding protrusion both extend along the length direction of the cable core unit.

[0025] Furthermore, the limiting groove and the limiting rib both extend along the length direction of the cable core unit.

[0026] Furthermore, the side support unit and the connection unit both extend along the length direction of the reinforcement unit.

[0027] Furthermore, the abutment protrusion extends along the length direction of the reinforcement unit.

[0028] Furthermore, the length of the thermocouple compensation cable is less than 15 meters, preferably less than 10 meters.

[0029] Furthermore, the wires of the pressure sensor and the wires of the temperature sensor at each installation tube are routed through the installation tube.

[0030] The installation tube is thus convenient for wiring and for installing pressure sensors and temperature sensors.

[0031] Furthermore, a plurality of temperature sensors and a plurality of pressure sensors are installed in each installation tube, and the plurality of temperature sensors are distributed at equal intervals, and the plurality of pressure sensors are distributed at equal intervals.

[0032] Thus, the temperature and pressure values ​​at multiple test points of the cable can be detected.

[0033] Furthermore, at least two temperature sensors and at least two pressure sensors are installed in each installation tube; the pressure sensors are strain gauge pressure sensors.

[0034] The temperature and pressure can be measured at multiple points of the thermocouple compensation cable, making the measurement more accurate.

[0035] Furthermore, the overall shielding layer is a copper wire braided shielding layer; the outer sub-shielding layer is a copper wire braided shielding layer, and the inner sub-shielding layer is a copper-plastic composite tape shielding layer; the overall wrapping layer is a flame-retardant tape wrapping layer, and the outer sheath is a polyolefin outer sheath.

[0036] Thus the shielding effect of the cable is good.

[0037] Furthermore, the inner protective layer is a polyolefin inner protective layer, the skeleton unit is made of PVC material, and the insulating layer is a polyethylene insulating layer.

[0038] Therefore, the skeleton unit has strong compression resistance and effectively protects the cable core unit.

[0039] Furthermore, the number of the cable core units is four.

[0040] This allows four thermocouples to be connected, making use more efficient.

[0041] Beneficial effects:

[0042] 1. The thermocouple compensation cable of the present application is provided with a reinforcement unit, which increases the mechanical strength of the cable, so that the cable is pressure-resistant and not easily deformed, and the reinforcement unit has high temperature resistance and corrosion resistance, so it is suitable for the working environment of a nuclear power plant.

[0043] 2. The thermocouple compensation cable of the present application has a multi-layer shielding structure, so that the shielding effect of the cable is good.

[0044] 3. Multiple cable core units are provided, and multiple thermocouples can be connected, so that temperature can be collected at multiple locations at the same time, and the temperature collection efficiency is high.

[0045] 4. The temperature sensor can detect whether the ambient temperature of the cable is abnormal, and the pressure sensor can detect whether the cable is deformed, so that corresponding measures can be taken in time to avoid affecting the accuracy of thermocouple measurement due to cable deformation or abnormal external temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a schematic diagram of the cable structure of Example 1 from a first viewing angle;

[0047] Figure 2 This is an enlarged view of area 1A;

[0048] Figure 3 This is a schematic diagram of the cable structure of Example 1 from a second viewing angle;

[0049] Figure 4 This is an enlarged view of area 1B;

[0050] Figure 5 This is a partial structural decomposition diagram of Example 1;

[0051] Figure 6 This is an enlarged view of the 1C area;

[0052] Figure 7 This is a schematic diagram of the cable structure of Example 2;

[0053] Figure 8 This is an enlarged view of area 2A;

[0054] Fig. 9 This is a partial structural decomposition diagram of Example 2;

[0055] Fig.10 This is an enlarged view of area 2B;

[0056] Description of reference numerals:

[0057] 1.1 Outer sheath; 1.2 Overall shielding layer; 1.3 Overall wrapping layer;

[0058] 2 Cable core unit; 2.1 Inner sheath; 2.1.1 Embedded protrusion; 2.1.2 Limiting groove; 2.1.3 Limiting rib; 2.1.4 First straight line; 2.1.5 Second straight line; 2.1.6 Third straight line; 2.2 Outer sub-item shielding layer; 2.3 Inner sub-item shielding layer; 2.4 Inner wrapping layer; 2.5 Insulating layer; 2.6 Conductor;

[0059] 3 reinforcement cladding; 3.1 containing groove; 3.1.1 straight edge; 3.1.2 curved edge; 3.2 embedding groove; 3.3 positioning recessed portion; 3.4 positioning raised portion; 3.5 abutting protrusion; 3.6 mounting groove;

[0060] 4 skeleton units;

[0061] 5 Mounting pipe; 5.1 Side plate; 5.2 Middle connecting plate; 5.3 Temperature sensor; 5.4 Pressure sensor. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] Example 1

[0064] This embodiment provides Figure 1-6 A thermocouple compensating cable for a nuclear power plant is shown, which comprises, from outside to inside, an outer sheath 1.1, a total shielding layer 1.2 and a total wrapping layer 1.3, wherein the total wrapping layer 1.3 comprises two reinforcement units, and a plurality of cable core units 2 are arranged between the two reinforcement units, and the plurality of cable core units 2 are arranged in a row; the cable core unit 2 comprises, from outside to inside, an inner sheath 2.1, an outer sub-item shielding layer 2.2, an inner sub-item shielding layer 2.3 and an inner wrapping layer 2.4, wherein the inner wrapping layer 2.4 has two cores, and the cores comprise an insulating layer 2.5 and a conductor 2.6 wrapped by the insulating layer 2.5.

[0065] The reinforcement unit includes a plurality of installation positions, the number of installation positions of each reinforcement unit is equal to the number of the cable core units 2, and one cable core unit 2 is installed between two installation positions corresponding to two reinforcement units; the installation position includes a receiving groove 3.1, the receiving groove 3.1 has two embedded grooves 3.2, the inner sheath 2.1 has four embedded protrusions 2.1.1 that cooperate with the embedded grooves 3.2, one side of the inner sheath 2.1 has a limiting groove 2.1.2, and the other side has a limiting rib 2.1.3 that cooperates with the limiting groove 2.1.2, any two adjacent cable core units 2 abut against each other, and the limiting rib 2.1.3 of one of the cable core units is inserted into the limiting groove 2.1.2 of the other cable core unit; the cross-section of the receiving groove 3.1 is an equilateral right triangle, and the right angle is an arc chamfered shape; both ends of the cross-section of the inner sheath 2.1 are right angles, and the right angle is an arc chamfered shape.

[0066] The cross section of the accommodating groove 3.1 includes two mutually perpendicular straight sides 3.1.1, the two straight sides 3.1.1 are connected by an arcuate side 3.1.2, and the two embedded grooves 3.2 are respectively located at the positions corresponding to the two straight sides 3.1.1; the cross section of the inner protective layer 2.1 includes two mutually parallel first straight lines 2.1.4, two mutually parallel second straight lines 2.1.5 and two mutually parallel third straight lines 2.1.6, each first straight line 2.1.4 is perpendicular to the second straight line 2.1.5 adjacent to it, and the two are connected by an arc line, and the four embedded protrusions 2.1.1 are respectively located at the positions corresponding to the two first straight lines 2.1.4 and the two second straight lines 2.1.5; the position corresponding to one of the third straight lines 2.1.6 has the limiting groove 2.1.2, and the position corresponding to the other third straight line 2.1.6 has the limiting rib 2.1.3.

[0067] The reinforcement unit comprises a reinforcement cladding 3 and a skeleton unit 4 wrapped by the reinforcement cladding 3, the reinforcement cladding 3 is extruded by polyethylene or silicone rubber, the skeleton unit 4 comprises two side support units and a connection unit connecting the two side support units, both ends of the reinforcement unit have abutment surfaces, the abutment surface of one reinforcement unit has a plurality of positioning recessed portions 3.3, and the abutment surface of the other reinforcement unit has a plurality of positioning protrusions 3.4 matched with the positioning recessed portions 3.3; the inner sides of both ends of the reinforcement unit are provided with abutment protrusions 3.5 with a fan-shaped cross-section that can abut the cable core unit 2, and the cross-section of each abutment protrusion 3.5 and the cross-section of one of the abutment protrusions 3.5 of the other reinforcement unit are spliced ​​into a semicircle; each cable core unit 2 is provided with two of the limiting ribs 2.1.3 and two of the limiting grooves 2.1.2.

[0068] The total shielding layer 1.2 is a copper wire braided shielding layer; the outer sub-shielding layer 2.2 is a copper wire braided shielding layer, and the inner sub-shielding layer 2.3 is a copper-plastic composite tape shielding layer; the total wrapping layer 1.3 is a flame-retardant tape wrapping layer, the outer sheath 1.1 is a polyolefin outer sheath; the inner sheath 2.1 is a polyolefin inner sheath, the skeleton unit 4 is made of PVC material, and the insulating layer 2.5 is a polyethylene insulating layer.

[0069] Working principle: The thermocouple compensation cable of the present application is provided with a reinforcement unit, which increases the mechanical strength of the cable, so that the cable can withstand pressure and is not easily deformed, and the reinforcement unit has high temperature resistance and corrosion resistance, so it is suitable for the working environment of a nuclear power plant; and the cable has a multi-layer shielding structure, so that the shielding effect of the cable is good; at the same time, multiple cable core units are provided, and multiple thermocouples can be connected, so that temperature can be collected at multiple locations at the same time.

[0070] Example 2

[0071] like Figure 7-10 As shown, the difference between Example 2 and Example 1 is that the abutting surfaces at both ends of the reinforcement unit are provided with mounting grooves 3.6, each mounting groove 3.6 and one mounting groove 3.6 of another reinforcement unit are spliced ​​into a mounting channel, and the mounting channel includes a main channel and secondary channels located on both sides of the main channel and connected to the main channel; a mounting tube 5 is installed in the mounting channel, and the mounting tube 5 is spliced ​​by two half tubes, and the half tube includes two side panels 5.1 located in the secondary channel and an intermediate connecting plate located in the main channel connecting the two side panels 5.1. 5.2, the cross section of the side plate 5.1 is straight, and the cross section of the middle connecting plate 5.2 is arc-shaped; a base plate is fixed at the middle connecting plate 5.2 of one of the two half-tubes, and a temperature sensor 5.3 is installed at the base plate; one of the side plates 5.1 of one of the two half-tubes has a step portion, and a pressure sensor 5.4 is installed at the step portion; at least two temperature sensors 5.3 and at least two pressure sensors 5.4 are installed in each mounting tube 5; the pressure sensor 5.4 is a strain gauge pressure sensor.

[0072] Working principle: The thermocouple compensation cable of the present application is provided with a reinforcement unit, which increases the mechanical strength of the cable, so that the cable is pressure-resistant and not easily deformed, and the reinforcement unit has high temperature resistance and corrosion resistance, so it is suitable for the working environment of a nuclear power plant; and the cable has a multi-layer shielding structure, so the shielding effect of the cable is good; at the same time, multiple cable core units are provided, and multiple thermocouples can be connected, so that temperature can be collected at multiple locations at the same time. In addition, the temperature sensor can detect whether the ambient temperature of the cable is abnormal, and the pressure sensor can detect whether the cable is deformed, so that corresponding measures can be taken in time to avoid affecting the accuracy of thermocouple measurement due to cable deformation or external temperature abnormality.

[0073] During the specific installation, after the cable core unit and the reinforcement unit are made, multiple cable core units and two installation tubes are assembled between the two reinforcement units. At the same time, the cable core unit is limited by the cooperation of the limiting convex rib and the limiting groove. The positioning protrusion at the end of the reinforcement unit is inserted into the positioning recess at the other reinforcement unit. The two abutting protrusions at the same end of the two reinforcement units are spliced ​​into a semicircular abutment to fix the cable core unit located on the outside, so as to fix the cable core unit, wrap the total wrapping layer, and then make the total shielding layer and outer sheath. When the cable is compressed or deformed, it can be detected by the pressure sensor. When the ambient temperature of the cable is abnormal, it can be detected by the temperature sensor. Therefore, when the pressure sensor or temperature sensor detects an abnormal value, the staff can be notified in time to take corresponding measures.

[0074] Although the present invention has been illustrated and described with respect to the preferred embodiments, it will be appreciated by those skilled in the art that various changes and modifications may be made to the present invention without departing from the scope of the present invention as defined by the claims.

Claims

1. A high-strength, high-temperature-resistant and corrosion-resistant special thermocouple compensation cable for nuclear power plants, characterized in that: From the outside to the inside, it includes an outer sheath, a total shielding layer and a total wrapping layer in sequence, the total wrapping layer includes two reinforcement units, and a plurality of cable core units are arranged between the two reinforcement units, and the plurality of cable core units are arranged in a row; the cable core unit includes an inner sheath, an outer sub-item shielding layer, an inner sub-item shielding layer and an inner wrapping layer in sequence from the outside to the inside, and the inner wrapping layer has two wire cores, and the wire core includes an insulating layer and a conductor wrapped by the insulating layer; the reinforcement unit includes a plurality of installation positions, and the number of installation positions of each reinforcement unit is equal to the number of the cable core units, and one cable core unit is installed between two installation positions corresponding to two reinforcement units; the installation position includes a receiving groove, and the receiving groove has two embedded grooves, The inner sheath is provided with 4 embedded protrusions that cooperate with the embedded grooves, one side of the inner sheath is provided with a limiting groove, and the other side is provided with a limiting convex rib that cooperates with the limiting groove, any two adjacent cable core units abut against each other, and the limiting convex rib of one of the cable core units is inserted into the limiting groove of the other cable core unit; the cross-section of the accommodating groove is an equilateral right triangle, and the right angles are in the shape of arc chamfers; both ends of the cross-section of the inner sheath are in the shape of right angles, and the right angles are in the shape of arc chamfers; the cross-section of the accommodating groove includes two mutually perpendicular straight sides, the two straight sides are connected by an arc side, and the two embedded grooves are respectively located at the positions corresponding to the two straight sides; the cross-section of the inner sheath includes two mutually parallel second A straight line, two mutually parallel second straight lines and two mutually parallel third straight lines, each first straight line is perpendicular to the second straight line adjacent to it, and the two are connected by an arc line, and four embedded protrusions are respectively located at positions corresponding to the two first straight lines and the two second straight lines; the position corresponding to one of the third straight lines has the limiting groove, and the position corresponding to the other third straight line has the limiting convex rib; the reinforcement unit includes a reinforcement cladding and a skeleton unit wrapped by the reinforcement cladding, the reinforcement cladding is extruded by polyethylene or silicone rubber, the skeleton unit includes two side support units and a connecting unit connecting the two side support units, and both ends of the reinforcement unit have abutment surfaces, wherein The abutting surface of one reinforcement unit has a plurality of positioning recessed parts, and the abutting surface of the other reinforcement unit has a plurality of positioning protrusions that cooperate with the positioning recessed parts; the inner sides of both ends of the reinforcement unit are provided with abutting protrusions with fan-shaped cross-sections that can abut the cable core unit, and the cross-section of each abutting protrusion and the cross-section of one of the abutting protrusions of the other reinforcement unit are spliced ​​into a semicircle; each cable core unit is provided with two limiting ribs and two limiting grooves; the abutting surfaces of both ends of the reinforcement unit are provided with installation grooves, and each installation groove and one of the installation grooves of the other reinforcement unit are spliced ​​into an installation channel, and the installation channel includes a main channel and secondary channels located on both sides of the main channel and connected to the main channel;The installation channel is provided with an installation tube, which is formed by splicing two half-tubes, and the half-tube includes two side plates located in the secondary channel and a middle connecting plate located in the main channel connecting the two side plates, the cross section of the side plates is straight, and the cross section of the middle connecting plate is arc-shaped; a base plate is fixed at the middle connecting plate of one of the two half-tubes, a temperature sensor is installed at the base plate, and a step portion is provided at one of the side plates of one of the two half-tubes, a pressure sensor is installed at the step portion. ; 2. The high-strength, high-temperature-resistant and corrosion-resistant special thermocouple compensation cable for nuclear power plants according to claim 1 is characterized in that: At least two temperature sensors and at least two pressure sensors are installed in each installation tube; the pressure sensors are strain gauge pressure sensors.

3. The high-strength, high-temperature-resistant and corrosion-resistant special thermocouple compensation cable for nuclear power plants according to claim 1, characterized in that: The overall shielding layer is a copper wire braided shielding layer; the outer sub-shielding layer is a copper wire braided shielding layer, and the inner sub-shielding layer is a copper-plastic composite tape shielding layer; the overall wrapping layer is a flame-retardant tape wrapping layer, and the outer sheath is a polyolefin outer sheath.

4. The high-strength, high-temperature-resistant and corrosion-resistant special thermocouple compensation cable for nuclear power plants according to claim 1, characterized in that: The inner protective layer is a polyolefin inner protective layer, the skeleton unit is made of PVC material, and the insulating layer is a polyethylene insulating layer.

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