Conductive oil gel for repairing ablation of power transmission line and preparation method of filler of conductive oil gel

Abstract

The invention discloses a power transmission line ablation repair conductive oil gel and a preparation method of a filler thereof, the conductive oil gel comprises a component A and a component B. The component A comprises 45%-60% by mass of ethanol, 10%-20% by mass of ethylene glycol, 10%-20% by mass of dipotassium adipate and 10%-20% by mass of liquid polysulfide rubber. The mass fraction of the adipic acid dipotassium salt is 10-20%; the mass fraction of liquid polysulfide rubber is 2-4%; and the component B is poly [(2-oxiranyl)-1, 2-cyclohexanediol] 2-ethyl-2-(hydroxymethyl)-1, 3-propylene glycol ether. The preparation method comprises the following steps: mixing ethanol and dipotassium adipate in the component A, then adding ethylene glycol and liquid polysulfide rubber, and finally adding the component B; according to the use method, the conductive oil gel is used for preparing a filling agent for cable repair. According to the invention, the ablated cable can be simply, conveniently and rapidly repaired, so that the cable with the ablated phenomenon can continue to work, and the cable does not need to be replaced. The cable life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to power cable, in particular to a preparation method of power line ablation repair conductive oil gel and its filler. BACKGROUND

[0002] In recent years, cable failures caused by ablation of cable buffer layer and outer shielding layer have occurred in many places in China, and similar reports have also been made in Singapore, Australia and other countries. Due to the humid environment in the tunnel, the cable bending part, the suspended corrugated aluminum and the water-blocking buffer layer, the insufficient conductive contact point causes the concentrated ablation of the local induced current. Such hidden dangers are particularly common. The ablation problem of the water-blocking buffer layer of the high-voltage cable is that the buffer layer is ablated at multiple places, the outer shielding layer of the cable is seriously ablated, and the insulation layer of the cable is endangered. If effective measures such as replacing the cable are not taken in time, the ablation point will continue to develop and the outer shielding layer will be completely ablated, and then the main insulation layer will be damaged, eventually leading to insulation breakdown failure of the cable body, triggering the cable warning device, and causing line trip accidents, which seriously endanger the stability of the cable line and the power system. The industry believes that after the water-blocking buffer layer absorbs moisture, the water-blocking powder, aluminum sleeve and water react to generate precipitates, causing the interlayer contact resistance of the buffer layer to exceed the standard, causing the capacitive current near the deteriorated position to concentrate, causing the local temperature to be too high; when the local hot spot and ablation point are serious, the buffer belt, the semi-conductive shielding layer and even the insulation layer will be damaged, causing the cable to fail. It is of great significance to the maintenance and management of the power system to ensure the reliable operation of the power system. SUMMARY

[0003] The problem solved by the present application is to provide a preparation method of a power line ablation repair conductive oil gel and its filler, which is used to prepare the filler, which is used for cable repair, can simply and quickly repair the ablated cable, so that the cable where the ablation phenomenon occurs can continue to work, and the cable does not need to be replaced. Prolong the service life of the cable.

[0004] To solve the above technical problems, the present application adopts the following technical means: A power line ablation repair conductive oil gel, comprising A and B two components, the A component is ethanol, ethylene glycol, adipic acid dipotassium salt, liquid polysulfide rubber, and the mass fraction of ethanol is 45%-60%; the mass fraction of adipic acid dipotassium salt is 10%-20%; the mass fraction of liquid polysulfide rubber is 2%-4%; the B component is poly[(2-oxirane)-1,2-cyclohexanediol]2-ethyl-2-(hydroxymethyl)-1,3-propanediol ether.

[0005] As a further improvement of the present technical document: The A component, ethanol 50 kg, adipic acid dipotassium salt 10 kg, ethylene glycol 38 kg, liquid polysulfide rubber 2 kg; the B component is poly [(2-oxiranylmethyl)-1,2-cyclohexanediol] 2-ethyl-2-(hydroxymethyl)-1,3-propanediol ether 2 kg.

[0006] The A component, ethanol 60 kg, adipic acid dipotassium salt 15 kg, ethylene glycol 22 kg, liquid polysulfide rubber 3 kg; the B component is poly [(2-oxiranylmethyl)-1,2-cyclohexanediol] 2-ethyl-2-(hydroxymethyl)-1,3-propanediol ether 3 kg.

[0007] The A component, ethanol 45 kg, adipic acid dipotassium salt 18 kg, ethylene glycol 33 kg, liquid polysulfide rubber 4 kg; the B component is poly [(2-oxiranylmethyl)-1,2-cyclohexanediol] 2-ethyl-2-(hydroxymethyl)-1,3-propanediol ether 4 kg.

[0008] The A component, ethanol 45 kg, adipic acid dipotassium salt 10 kg, ethylene glycol 38 kg, liquid polysulfide rubber 2 kg; the B component is poly [(2-oxiranylmethyl)-1,2-cyclohexanediol] 2-ethyl-2-(hydroxymethyl)-1,3-propanediol ether 2 kg.

[0009] The preparation method of the transmission line ablation repair conductive oil gel filling agent, comprising the following steps: 1) ethanol and adipic acid dipotassium salt are mixed, heated to 50°C, and stirred for 1 hour to dissolve into a solution; after cooling, the product of step 1 is obtained; 2) ethylene glycol and liquid polysulfide rubber are added to the product of step 1, mixed for 10 minutes to obtain the product of step 2; 3) poly [(2-oxiranylmethyl)-1,2-cyclohexanediol] 2-ethyl-2-(hydroxymethyl)-1,3-propanediol ether is added to the product of step 2, and after mixing for 10 minutes, the transmission line ablation repair conductive oil gel filling agent is obtained.

[0010] The use method of the transmission line ablation repair conductive oil gel, comprising the following steps: 1) the product of step 2 is transported to the construction site; 2) the cable is stripped to expose the corrugated aluminum sheath at both ends of the filling section of the high-voltage transmission cable to be repaired, and punching is performed on the corrugated aluminum sheath at both ends of the filling section, wherein the punching on one end of the corrugated aluminum sheath serves as the inlet hole of the conductive oil gel filling agent, and the punching on the other end of the corrugated aluminum sheath serves as the exhaust hole during filling of the conductive oil gel filling agent; the inlet of the high-pressure pump is connected to the container storing the conductive oil gel filling agent through an inlet pipeline, and the outlet of the high-pressure pump is connected to the inlet hole of the conductive oil gel filling agent through an outlet pipeline; 3) After mixing B component with the product of step 2, the conductive oil gel filler for repairing the ablation of power transmission line is obtained after 10 minutes; 4) Start the high-pressure pump to inject the filler in the container into the gap between the corrugated aluminum sheath and the buffer layer from the inlet hole on one end of the filling section of the corrugated aluminum sheath, and when the liquid flows out of the exhaust hole on the other end of the corrugated aluminum sheath, stop the high-pressure pump; 5) Remove the pipeline of the inlet hole of the filler, tightly cover and wrap the corrugated aluminum sheath inlet hole and exhaust hole at both ends of the filling section with non-woven fabric, and then brush epoxy resin-based adhesive on the surface of the non-woven fabric for curing and sealing.

[0011] The technical advantages of the present application are: 1) The conductivity of the gel after filling is 405.7-605.3 microsiemens per centimeter, the viscosity of the material before filling is 190.7.7-225.3 mPa·s, and the material has excellent flowability. After filling for 80-140 hours, the liquid polysulfide rubber and poly[(2-oxiranylyl)-1,2-cyclohexanediol] 2-ethyl-2-(hydroxymethyl)-1,3-propanediol ether form a three-dimensional network crosslinked system, the crosslinked network absorbs solvent ethylene glycol, ethanol, and dipotassium adipate to form a semi-solid gel, which increases the contact angle area of the conductive layer between the water-blocking layer and the corrugated aluminum layer, avoids the occurrence of ablation, and avoids material leakage during subsequent operation. DETAILED DESCRIPTION

[0012] The present application will be further described below in conjunction with examples. EXAMPLE

[0013] The conductive oil gel for repairing the ablation of power transmission line in this example, 1) Mix 50 kg of ethanol with 10 kg of dipotassium adipate, heat to 50℃, and stir for 1 hour to dissolve into a solution, and after cooling, obtain the product of step 1; 2) Add 38 kg of ethylene glycol and 2 kg of liquid polysulfide rubber to the product of step 1, mix for 10 minutes to obtain the product of step 2, and transport the product of step 2 to the construction site; 3) Expose the corrugated aluminum sheath by peeling off the cable at both ends of the filling section of the high-voltage power transmission cable that needs to be repaired, and punch holes on the corrugated aluminum sheath at both ends of the filling section, wherein the punched hole on one end of the corrugated aluminum sheath serves as the inlet hole of the conductive oil gel filler, and the punched hole on the other end of the corrugated aluminum sheath serves as the exhaust hole during filling of the conductive oil gel filler; the inlet of the high-pressure pump is connected to the container storing the conductive oil gel filler through an inlet pipeline, and the outlet of the high-pressure pump is connected to the inlet hole of the conductive oil gel filler through an outlet pipeline; 4) In the product of step 2, add 2 kg of poly [(2-oxiranylmethyl)-1, 2-cyclohexanediol] 2-ethyl-2- (hydroxymethyl)-1, 3-propanediol ether, after mixing for 10 minutes, it is the transmission line ablation repair conductive oil gel filler. The tested viscosity is: 190.7 mPa·s.

[0014] 5) Start the high-pressure pump to inject the filler in the container from the inlet hole on one end of the corrugated aluminum sheath of the filling section into the gap between the corrugated aluminum sheath and the buffer layer, and when the exhaust hole on the other end of the corrugated aluminum sheath of the filling section flows out the liquid, turn off the high-pressure pump; 6) Remove the outlet pipeline connected to the hole on one end of the corrugated aluminum sheath of the filling section, tightly cover and wrap non-woven fabric on the holes on the corrugated aluminum sheaths at both ends of the filling section, then brush epoxy resin-based adhesive on the surface of the non-woven fabric, and perform curing and sealing. After 120 hours, the sample taken before injection forms a gel, and the conductivity is 405.7 microsiemens per centimeter. Example

[0015] The conductive oil gel for transmission line ablation repair of this example, 1) Dissolve 60 kg of ethanol and 15 kg of adipic acid dipotassium salt into a solution by heating to 50℃ and stirring for 1 hour. After cooling, the product of step 1 is obtained; 2) Add 22 kg of ethylene glycol and 3 kg of liquid polysulfide rubber to the product of step 1, mix for 10 minutes, and obtain the product of step 2. The product of step 2 is transported to the construction site; 3) Expose the corrugated aluminum sheath by peeling off the cable at both ends of the filling section of the high-voltage transmission cable that needs to be repaired, and perform punching on the corrugated aluminum sheaths at both ends of the filling section. The punching on one end of the corrugated aluminum sheath serves as the inlet hole for the conductive oil gel filler, and the punching on the other end of the corrugated aluminum sheath serves as the exhaust hole when the conductive oil gel filler is filled. The inlet of the high-pressure pump is connected to the container storing the conductive oil gel filler through an inlet pipeline, and the outlet of the high-pressure pump is connected to the inlet hole of the conductive oil gel filler through an outlet pipeline; 4) In the product of step 2, add 3 kg of poly [(2-oxiranylmethyl)-1, 2-cyclohexanediol] 2-ethyl-2- (hydroxymethyl)-1, 3-propanediol ether, after mixing for 10 minutes, it is the transmission line ablation repair conductive oil gel filler. The tested viscosity is: 203.7 mPa·s.

[0016] 5) Start the high-pressure pump to inject the filler in the container from the inlet hole on one end of the corrugated aluminum sheath of the filling section into the gap between the corrugated aluminum sheath and the buffer layer, and when the exhaust hole on the other end of the corrugated aluminum sheath of the filling section flows out the liquid, turn off the high-pressure pump; 6) Remove the outlet pipe connected to the hole on one end of the corrugated aluminum sheath of the filling section, tightly wrap non-woven fabric on the holes on the corrugated aluminum sheaths at both ends of the filling section, then brush epoxy resin-based adhesive on the surface of the non-woven fabric, and cure and seal. After 98 hours, the sample taken before injection forms a gel, and the conductivity is 593.2 microsiemens per centimeter. Example

[0017] A conductive oil gel for ablation repair of a power transmission line in this example, 1) Dissolve 45 kg of ethanol and 20 kg of adipic acid dipotassium salt into a solution by heating to 50°C and stirring for 1 hour. After cooling, the product of step 1 is obtained.

[0018] 2) Add 31 kg of ethylene glycol and 4 kg of liquid polysulfide rubber to the product of step 1 and mix for 10 minutes to obtain the product of step 2. The product of step 2 is transported to the construction site.

[0019] 3) Expose the corrugated aluminum sheath by peeling off the cable at both ends of the filling section of the high-voltage power transmission cable that needs to be repaired, and punch holes on the corrugated aluminum sheath at both ends of the filling section. The punched hole on one end of the corrugated aluminum sheath serves as the inlet hole for the conductive oil gel filler, and the punched hole on the other end of the corrugated aluminum sheath serves as the exhaust hole when the conductive oil gel filler is filled. The inlet of the high-pressure pump is connected to the container storing the conductive oil gel filler through an inlet pipe, and the outlet of the high-pressure pump is connected to the inlet hole of the conductive oil gel filler through an outlet pipe.

[0020] 4) Add 4 kg of poly[(2-oxiranylyl)-1,2-cyclohexanediol] 2-ethyl-2-(hydroxymethyl)-1,3-propanediol ether to the product of step 2, and after mixing for 10 minutes, the conductive oil gel filler for ablation repair of a power transmission line is obtained. The viscosity is tested to be 213.7 mPa·s.

[0021] 5) Start the high-pressure pump to inject the filler in the container from the inlet hole on one end of the corrugated aluminum sheath into the gap between the corrugated aluminum sheath and the buffer layer. When liquid flows out of the exhaust hole on the other end of the corrugated aluminum sheath of the filling section, turn off the high-pressure pump. 6) Remove the outlet pipe connected to the hole on one end of the corrugated aluminum sheath of the filling section, tightly wrap non-woven fabric on the holes on the corrugated aluminum sheaths at both ends of the filling section, then brush epoxy resin-based adhesive on the surface of the non-woven fabric, and cure and seal. After 80 hours, the sample taken before injection forms a gel, and the conductivity is 605.3 microsiemens per centimeter. Example

[0022] A conductive oil gel for ablation repair of a power transmission line in this example, 1) Dissolve 45 kg of ethanol and 18 kg of adipic acid dipotassium salt into a solution by heating to 50°C and stirring for 1 hour. After cooling, the product of step 1 is obtained.

[0023] 2) Add 33 kg of ethylene glycol and 4 kg of liquid polysulfide rubber to the product of step 1 and mix for 10 minutes to obtain the product of step 2. Transport the product of step 2 to the construction site.

[0024] 3) Expose the corrugated aluminum sheath by peeling off the cable at both ends of the filling section of the high-voltage transmission cable to be repaired, and make holes on the corrugated aluminum sheath at both ends of the filling section, wherein the hole on one end of the corrugated aluminum sheath serves as the inlet hole for the conductive oil gel filler, and the hole on the other end of the corrugated aluminum sheath serves as the exhaust hole for the conductive oil gel filler during filling; the inlet of the high-pressure pump is connected to the container storing the conductive oil gel filler through an inlet pipeline, and the outlet of the high-pressure pump is connected to the inlet hole of the conductive oil gel filler through an outlet pipeline; 4) Add 4 kg of poly[(2-oxiranylyl)-1,2-cyclohexanediol] 2-ethyl-2-(hydroxymethyl)-1,3-propanediol ether to the product of step 2, and after mixing for 10 minutes, the product is the conductive oil gel filler for ablation repair of the transmission line. The viscosity is tested to be 225.3 mPa·s.

[0025] 5) Start the high-pressure pump to inject the filler in the container into the gap between the corrugated aluminum sheath and the buffer layer from the inlet hole on one end of the corrugated aluminum sheath of the filling section, and when liquid flows out of the exhaust hole on the other end of the corrugated aluminum sheath of the filling section, turn off the high-pressure pump; 6) Remove the outlet pipeline connected to the hole on one end of the corrugated aluminum sheath of the filling section, tightly cover and wrap non-woven fabric on the holes on the corrugated aluminum sheaths at both ends of the filling section, and then brush epoxy resin-based adhesive on the surface of the non-woven fabric, and perform curing and sealing. After 80 hours, the sample taken before injection forms a gel, and the conductivity is 593.2 microsiemens per centimeter.

[0026] The advantages of the present application are: 1) the conductivity of the gel after filling is 405.7-605.3 microsiemens per centimeter, the viscosity of the material before filling is in the range of 190.7.7-225.3 mPa·s, and the material has excellent flowability; after 80-140 hours of filling, the liquid polysulfide rubber and poly[(2-oxiranylyl)-1,2-cyclohexanediol] 2-ethyl-2-(hydroxymethyl)-1,3-propanediol ether form a three-dimensional network crosslinked system, the crosslinked network absorbs solvents such as ethylene glycol, ethanol, and dipotassium adipate to form a semi-solid gel, which increases the conductive contact angle area between the water-blocking layer and the corrugated aluminum layer, avoids the occurrence of ablation, and avoids material leakage during subsequent operation.

[0027] The above description is only a preferred and feasible embodiment of the present application, and does not limit the scope of the present application. Any equivalent changes made according to the present application are included in the scope of the present application.

Claims

1. A conductive oil gel for repairing ablation of power transmission lines, characterized in that, It includes two components, A and B. Component A consists of ethanol, ethylene glycol, dipotassium adipic acid salt, and liquid polysulfide rubber, with the ethanol mass fraction being 45%-60%, the dipotassium adipic acid salt mass fraction being 10%-20%, and the liquid polysulfide rubber mass fraction being 2%-4%. Component B is poly[(2-epoxyethylene)-1,2-cyclohexanediol]2-ethyl-2-(hydroxymethyl)-1,3-propanediol ether.

2. The conductive oil gel for repairing ablation of transmission lines according to claim 1, characterized in that, Component A consists of 50 kg of ethanol, 10 kg of dipotassium adipic acid, 38 kg of ethylene glycol, and 2 kg of liquid polysulfide rubber; Component B consists of 2 kg of poly[(2-epoxyethylene)-1,2-cyclohexanediol]2-ethyl-2-(hydroxymethyl)-1,3-propanediol ether.

3. The conductive oil gel for repairing ablation of transmission lines according to claim 1, characterized in that, Component A consists of 60 kg of ethanol, 15 kg of dipotassium adipic acid, 22 kg of ethylene glycol, and 3 kg of liquid polysulfide rubber; Component B consists of 3 kg of poly[(2-epoxyethylene)-1,2-cyclohexanediol]2-ethyl-2-(hydroxymethyl)-1,3-propanediol ether.

4. The conductive oil gel for repairing ablation of transmission lines according to claim 1, characterized in that, Component A consists of 45 kg of ethanol, 18 kg of dipotassium adipic acid, 33 kg of ethylene glycol, and 4 kg of liquid polysulfide rubber; Component B consists of 4 kg of poly[(2-epoxyethylene)-1,2-cyclohexanediol]2-ethyl-2-(hydroxymethyl)-1,3-propanediol ether.

5. The conductive oil gel for repairing ablation of transmission lines according to claim 1, characterized in that, Component A consists of 45 kg of ethanol, 10 kg of dipotassium adipic acid, 38 kg of ethylene glycol, and 2 kg of liquid polysulfide rubber; Component B consists of 2 kg of poly[(2-epoxyethylene)-1,2-cyclohexanediol]2-ethyl-2-(hydroxymethyl)-1,3-propanediol ether.

6. The preparation method of the conductive oil gel filler for transmission line ablation repair according to any one of claims 1-5, characterized in that... Includes the following steps: 1) Mix ethanol with dipotassium adipic acid salt, heat to 50°C and stir for 1 hour to dissolve into a solution; after cooling, the product of step 1 is obtained; 2) Add ethylene glycol and liquid polysulfide rubber to the product in step 1, mix for 10 minutes to obtain the product in step 2; 3) Add poly[(2-epoxyethylene)-1,2-cyclohexanediol] 2-ethyl-2-(hydroxymethyl)-1,3-propanediol ether to the product in step 2. After mixing for 10 minutes, the conductive oil gel filler for the repair of power transmission line ablation is obtained.

7. The method of using the conductive oil gel for ablation repair of transmission lines according to claim 6, characterized in that... Includes the following steps: 1) Transport the product from step 2 to the construction site; 2) Strip the cable at both ends of the high-voltage transmission cable filling section to expose the corrugated aluminum sheath. Drill holes in the corrugated aluminum sheath at both ends of the filling section. One hole in the corrugated aluminum sheath serves as the inlet hole for the conductive oil gel filler, and the other hole serves as the vent hole for the conductive oil gel filler during filling. The inlet of the high-voltage pump is connected to the container storing the conductive oil gel filler through an inlet pipe, and the outlet of the high-voltage pump is connected to the inlet hole of the conductive oil gel filler through an outlet pipe. 3) Add component B to the product in step 2, and after mixing for 10 minutes, a conductive oil gel filler for the repair of ablation of transmission lines is obtained; 4) Start the high-pressure pump to inject the filler in the container into the gap between the corrugated aluminum sheath and the buffer layer through the inlet hole on the corrugated aluminum sheath at one end of the filling section. When liquid flows out of the vent hole on the corrugated aluminum sheath at the other end of the filling section, turn off the high-pressure pump. 5) Remove the pipe from the manhole of the filler, and tightly cover and wrap the corrugated aluminum sheath manhole and vent hole at both ends of the filler section with non-woven fabric. Then brush epoxy resin-based adhesive onto the surface of the non-woven fabric for curing and sealing.