CN104299716B - High voltage power transmission power cable - Google Patents

Abstract

The invention discloses a high-voltage transmission power cable, which comprises three conductors, a conductor shielding layer, an insulating layer and a protective layer; the conductor shielding layer is arranged outside the conductor, the insulating layer is arranged outside the conductor shielding layer, and the three conductors are arranged on the protective layer inside; also includes a cylindrical fixing device, the cylindrical fixing device is located in the protective layer; the side of the cylindrical fixing device is equidistantly provided with 3 arc-shaped grooves; the 3 conductors are respectively located in the arc-shaped groove; the cavity formed between the conductor, the cylindrical fixing device, and the protective layer is filled with an insulating filler; it also includes a remote breakpoint detection unit and N terminal breakpoint detection units; the N terminal breakpoint detection units The point detection units are equidistantly arranged on the high-voltage transmission power cable line; N≥2. The power cable of the present invention does not have the short circuit problem caused by friction; once the power cable breaks the circuit problem, the break point can be quickly judged, the core hardness is high, and the resistivity is low.

Description

High voltage transmission power cable

technical field

The invention relates to the technical field of high-voltage power transmission, in particular to a high-voltage power transmission power cable.

Background technique

With the rapid development of the national economy, the amount and scope of use of power cables as the main artery of the national economy are increasing. Power cables are cables used to transmit and distribute electrical energy. It is often used in urban underground power grids, outgoing lines of power stations, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas. In power lines, the proportion of power cables is gradually increasing. Power cables are cable products used to transmit and distribute high-power electric energy in the main line of the power system, including 1-500KV and above various voltage levels and various insulated power cables.

The basic structure of a power cable consists of four parts: a core (conductor), an insulating layer, a shielding layer and a protective layer. The core is the conductive part of the power cable, which is used to transmit electric energy and is the main part of the power cable. The insulating layer is to electrically isolate the wire core from the ground and the wire cores of different phases to ensure the transmission of electric energy. It is an indispensable part of the power cable structure. Shielding layer, because the current passing through the power cable is relatively large, and a magnetic field will be generated around the current. In order not to affect other components, adding a shielding layer can shield this electromagnetic field in the cable. The function of the protective layer is to protect the power cable from the intrusion of external impurities and moisture, and to prevent the power cable from being directly damaged by external force.

A big defect of the existing three-phase power cables is that the A-phase, B-phase, and C-phase wires are all cylindrical, so that there is easy sliding friction between the phases, and a short circuit between the phases is prone to occur after a long time.

Another problem with three-phase power cables is that once an open circuit occurs, it is very difficult to find the open circuit point, which will lead to long-term and large-scale power outages.

The cores of existing power cables are generally made of aluminum alloy material, but the hardness of the aluminum alloy material is not high enough, so other components are added to the aluminum alloy material to increase the hardness, but the resistivity will increase significantly.

Contents of the invention

The technical problem to be solved by the present invention: first, the phenomenon of sliding friction easily occurs between the A phase, B phase and C phase of the existing three-phase power cable, and a short circuit will occur once the insulating layer is worn out after a long time;

Second, once there is an open circuit problem in the power cable, it is very difficult to find the open circuit point, which will lead to long-term and large-scale power outages.

Third, the cores of existing power cables are generally made of aluminum alloy materials, and the hardness of aluminum alloy materials is not high enough, so other components are added to the aluminum alloy materials to increase the hardness, but it will lead to a substantial increase in resistivity .

In order to solve the above technical problems, the technical solution of the present invention is as follows:

High-voltage transmission power cable, including 3 conductors, conductor shielding layer, insulating layer, and protective layer; the conductor shielding layer is arranged outside the conductor, the insulating layer is arranged outside the conductor shielding layer, and the 3 conductors are arranged inside the protective layer; it also includes Cylindrical fixing device, the cylindrical fixing device is located in the protective layer; the side of the cylindrical fixing device is equidistantly provided with three arc-shaped grooves; the three conductors are respectively located in the arc-shaped grooves; The cavity formed between the conductor, the cylindrical fixture, and the protective layer is filled with an insulating filler;

It also includes a remote breakpoint detection unit and N terminal breakpoint detection units; the N terminal breakpoint detection units are equidistantly arranged on the high-voltage transmission power cable line; N≥2;

Among them, the N terminal breakpoint detection units are named sequentially from the left end to the right end: the first terminal breakpoint detection unit, the i-th terminal breakpoint detection unit, and the Nth terminal breakpoint detection unit; 1≤i≤N;

The remote breakpoint detection unit includes a total controller unit, a total wireless communication unit, a keyboard unit, and a display unit; the total wireless communication unit, the keyboard unit, and the display unit are respectively connected to the IO ports of the total controller unit;

The terminal breakpoint detection unit includes three conductive metal strips, a first switch, a second switch, a third switch, a controller unit, and a wireless communication unit;

Among them, the three conductors are named: the first conductor, the second conductor, and the third conductor; the three conductive metal strips are named: the first conductive metal strip, the second conductive metal strip, and the third conductive metal strip;

The first conductive metal strip passes through the conductor shielding layer, the insulating layer, and the protective layer. One end of the first conductive metal strip is electrically connected to the first conductor, and the other end is located outside the protective layer and simultaneously electrically connected to the input end of the first switch and the second the input of the switch;

The second conductive metal strip passes through the conductor shielding layer, the insulating layer, and the protective layer. One end of the second conductive metal strip is electrically connected to the second conductor, and the other end is located outside the protective layer and simultaneously electrically connected to the output end of the first switch and the third the input of the switch;

The third conductive metal strip passes through the conductor shielding layer, the insulating layer, and the protective layer. One end of the third conductive metal strip is electrically connected to the third conductor, and the other end is located outside the protective layer and simultaneously electrically connected to the output end of the second switch and the third the output of the switch;

The outer surfaces of the first conductive metal strip, the second conductive metal strip, and the third conductive metal strip are all provided with insulating layers;

The first switch, the second switch, and the third switch all include control terminals, and the control terminals of the first switch, the second switch, and the third switch are respectively connected to the IO port of the controller unit;

The controller unit communicates with the general controller unit.

Wherein, the conductor is made of aluminum alloy material, and the weight ratio of the aluminum alloy material is as follows: aluminum: 1000 parts; lutetium: 1-4 parts; manganese: 12-15 parts;

After preparing the aluminum alloy raw materials according to the above weight ratio, firstly, the melting temperature is 830°C, after stirring, degassing and refining with hexachlorobenzene, continuous casting is carried out using a continuous casting machine, and continuous casting is made into an aluminum alloy ingot of Φ120mm;

Then, an aluminum alloy rod of Φ35mm is made by hot extrusion at 420°C with an extruder;

Then, perform annealing treatment at 420°C for 50 hours;

Finally, a Φ4mm aluminum-lutetium-manganese alloy wire was prepared by drawing eight times with a wire drawing machine.

In a more preferred technical solution, both the total wireless communication unit and the wireless communication unit use a gprs communication module.

In a more preferred technical solution, the display unit adopts digital tube display.

In a more preferred technical solution, both the overall controller unit and the controller unit use MSP430 single-chip microcomputers.

In a more preferred technical solution, the first switch, the second switch, and the third switch all use relays.

In a more preferred technical solution, the first switch, the second switch, and the third switch all use controllable thyristors.

Compared with the existing technical solutions, the beneficial effects of the present invention are as follows: First, the phases A, B and C of the power cable of the present invention are fixed and stable, and do not touch each other, and there is no phenomenon of sliding friction, so there is no There is a short circuit problem caused by friction; second, once the power cable breaks, the break point can be quickly judged, which solves the problem of long-term and large-scale power outages caused by the power cable break.

Thirdly, the core conductor of the power cable of the present invention is made of aluminum alloy material, and while the hardness is increased, the resistivity is reduced instead.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the power cable of the present invention.

Among them, 1 is a conductor, 2 is a conductor shielding layer, 3 is an insulating layer, 4 is a cylindrical fixing device, and 5 is a protective layer.

Fig. 2 is a connection schematic diagram of the switch part of the power cable of the present invention.

Fig. 3 is a schematic block diagram of the circuit principle of the remote breakpoint detection unit and the terminal breakpoint detection unit of the present invention.

detailed description

The present invention will be further described below in conjunction with accompanying drawing.

Embodiment 1: a high-voltage transmission power cable, including 3 conductors, a conductor shielding layer, an insulating layer, and a protective layer; the conductor shielding layer is arranged on the outside of the conductor, the insulating layer is arranged on the outside of the conductor shielding layer, and the three conductors are arranged on the protective layer inside; also includes a cylindrical fixing device, the cylindrical fixing device is located in the protective layer; the side of the cylindrical fixing device is equidistantly provided with 3 arc-shaped grooves; the 3 conductors are respectively located in the arc-shaped groove; the cavity formed between the conductor, the cylindrical fixing device, and the protective layer is filled with an insulating filler; it also includes a remote breakpoint detection unit and 6 terminal breakpoint detection units; the 6 terminal breakpoint detection units The point detection units are equidistantly arranged on the high-voltage transmission power cable line;

Among them, the six terminal breakpoint detection units are named sequentially from the left end to the right end: the first terminal breakpoint detection unit, the second terminal breakpoint detection unit, the third terminal breakpoint detection unit, the fourth terminal breakpoint detection unit, the 5 terminal breakpoint detection unit, 6th terminal breakpoint detection unit;

The remote breakpoint detection unit includes a total controller unit, a total wireless communication unit, a keyboard unit, and a display unit; the total wireless communication unit, the keyboard unit, and the display unit are respectively connected to the IO ports of the total controller unit;

The terminal breakpoint detection unit includes three conductive metal strips, a first switch, a second switch, a third switch, a controller unit, and a wireless communication unit;

Among them, the three conductors are named: the first conductor, the second conductor, and the third conductor; the three conductive metal strips are named: the first conductive metal strip, the second conductive metal strip, and the third conductive metal strip;

The first conductive metal strip passes through the conductor shielding layer, the insulating layer, and the protective layer. One end of the first conductive metal strip is electrically connected to the first conductor, and the other end is located outside the protective layer and simultaneously electrically connected to the input end of the first switch and the second the input of the switch;

The second conductive metal strip passes through the conductor shielding layer, the insulating layer, and the protective layer. One end of the second conductive metal strip is electrically connected to the second conductor, and the other end is located outside the protective layer and simultaneously electrically connected to the output end of the first switch and the third the input of the switch;

The third conductive metal strip passes through the conductor shielding layer, the insulating layer, and the protective layer. One end of the third conductive metal strip is electrically connected to the third conductor, and the other end is located outside the protective layer and simultaneously electrically connected to the output end of the second switch and the third the output of the switch;

The outer surfaces of the first conductive metal strip, the second conductive metal strip, and the third conductive metal strip are all provided with insulating layers;

The first switch, the second switch, and the third switch all include control terminals, and the control terminals of the first switch, the second switch, and the third switch are respectively connected to the IO port of the controller unit;

The controller unit communicates with the general controller unit.

Wherein, the total wireless communication unit and the wireless communication unit all adopt gprs communication module; the display unit adopts digital tube display; the total controller unit and the controller unit both adopt MSP430 single-chip microcomputer. The first switch, the second switch and the third switch all adopt relays.

Wherein, the conductor is made of aluminum alloy material, and the weight ratio of the aluminum alloy material is as follows: aluminum: 1000 parts; lutetium: 1 part; manganese: 12 parts;

After preparing the aluminum alloy raw materials according to the above weight ratio, firstly, the melting temperature is 830°C, after stirring, degassing and refining with hexachlorobenzene, continuous casting is carried out using a continuous casting machine, and continuous casting is made into an aluminum alloy ingot of Φ120 mm;

Then, an aluminum alloy rod of Φ35mm is made by hot extrusion at 420°C with an extruder;

Then, perform annealing treatment at 420°C for 50 hours;

Finally, a Φ4mm aluminum-lutetium-manganese alloy wire was prepared by drawing eight times with a wire drawing machine.

Example 2:

On the basis of Embodiment 1, the first switch, the second switch, and the third switch all use controllable thyristors.

Wherein, the conductor is made of aluminum alloy material, and the weight ratio of the aluminum alloy material is as follows: aluminum: 1000 parts; lutetium: 2 parts; manganese: 13 parts;

After preparing the aluminum alloy raw materials according to the above weight ratio, firstly, the melting temperature is 830°C, after stirring, degassing and refining with hexachlorobenzene, continuous casting is carried out using a continuous casting machine, and continuous casting is made into an aluminum alloy ingot of Φ120mm;

Then, an aluminum alloy rod of Φ35mm is made by hot extrusion at 420°C with an extruder;

Then, perform annealing treatment at 420°C for 50 hours;

Finally, a Φ4mm aluminum-lutetium-manganese alloy wire was prepared by drawing eight times with a wire drawing machine.

Example 3:

Others are exactly the same as in Example 1, wherein the conductor is made of an aluminum alloy material, and the weight ratio of the aluminum alloy material is as follows:

Aluminum: 1000 parts; Lutetium: 3 parts; Manganese: 14 parts;

After preparing the aluminum alloy raw materials according to the above weight ratio, firstly, the melting temperature is 830°C, after stirring, degassing and refining with hexachlorobenzene, continuous casting is carried out using a continuous casting machine, and continuous casting is made into an aluminum alloy ingot of Φ120 mm;

Then, an aluminum alloy rod of Φ35mm is made by hot extrusion at 420°C with an extruder;

Then, perform annealing treatment at 420°C for 50 hours;

Finally, a Φ4mm aluminum-lutetium-manganese alloy wire was prepared by drawing eight times with a wire drawing machine.

Example 4:

Others are exactly the same as in Example 1, wherein the conductor is made of an aluminum alloy material, and the weight ratio of the aluminum alloy material is as follows:

Aluminum: 1000 parts; Lutetium: 4 parts; Manganese: 15 parts;

After preparing the aluminum alloy raw materials according to the above weight ratio, firstly, the melting temperature is 830°C, after stirring, degassing and refining with hexachlorobenzene, continuous casting is carried out using a continuous casting machine, and continuous casting is made into an aluminum alloy ingot of Φ120 mm;

Then, an aluminum alloy rod of Φ35mm is made by hot extrusion at 420°C with an extruder;

Then, perform annealing treatment at 420°C for 50 hours;

Finally, a Φ4mm aluminum-lutetium-manganese alloy wire was prepared by drawing eight times with a wire drawing machine.

The change values of resistivity and hardness in the above 4 embodiments are as shown in Table 1:

Table 1:

From the above Table 1, it can be found that the hardness of the aluminum alloy wire of the present invention is significantly improved, and the resistivity is reduced instead, so the performance of the power cable conductor made of the aluminum alloy wire of the present invention is significantly improved.

The method of finding the break point by using the invented power cable system is as follows:

1) Apply 120V DC voltage to the ends of the first conductor and the second conductor, the first conductor and the third conductor, the second conductor and the third conductor at the left end of the high-voltage transmission power cable in sequence, and connect a DC ammeter in series in the line;

2) The keyboard unit is used to control the general controller unit to send switch closing and opening commands to the controller of the N/2th terminal breakpoint detection unit; when the 120V DC voltage is applied to the ends of the first conductor and the second conductor, the first The controller of the N/2 terminal breakpoint detection unit controls the closing of the first switch, and controls the opening of the first switch at an interval of 10 seconds; when the 120V DC voltage is applied to the ends of the first conductor and the third conductor, the N/2 terminal The controller of the breakpoint detection unit controls the closing of the second switch, and controls the opening of the second switch at an interval of 10 seconds; when the 120V DC voltage is applied to the ends of the second conductor and the third conductor, the N/2 terminal breakpoint detection unit The controller controls to close the third switch, and controls to open the third switch at an interval of 10 seconds;

3) If all the DC ammeters have readings, it means that the breakpoint is on the right side of the N/2 terminal breakpoint detection unit; if the DC ammeters do not have all readings, it means that the breakpoint is on the left side of the N/2 terminal breakpoint detection unit ;

4) If the breakpoint is on the right side of the N/2 terminal breakpoint detection unit, the keyboard unit controls the general controller unit to send the switch closing and opening commands to the controller of the N/2+1 terminal breakpoint detection unit ; When the 120V DC voltage is applied to the ends of the first conductor and the second conductor, the controller of the N/2+1 terminal breakpoint detection unit controls to close the first switch, and controls to open the first switch at an interval of 10 seconds; when When 120V DC voltage is applied to the ends of the first conductor and the third conductor, the controller of the N/2+1 terminal breakpoint detection unit controls to close the second switch, and controls to open the second switch at intervals of 10 seconds; when 120V DC When the voltage is applied to the ends of the second conductor and the third conductor, the controller of the N/2+1 terminal breakpoint detection unit controls to close the third switch, and controls to open the third switch at intervals of 10 seconds;

If the breakpoint is on the left side of the N/2 terminal breakpoint detection unit, the keyboard unit is used to control the general controller unit to send the switch closing and opening commands to the controller of the N/2-1 terminal breakpoint detection unit; When a 120V DC voltage is applied to the ends of the first conductor and the second conductor, the controller of the N/2-1 terminal breakpoint detection unit controls to close the first switch, and controls to open the first switch at intervals of 10 seconds; when 120V DC When the voltage is applied to the ends of the first conductor and the third conductor, the controller of the N/2-1 terminal breakpoint detection unit controls to close the second switch, and controls to open the second switch at intervals of 10 seconds; when 120V DC voltage is applied At the ends of the second conductor and the third conductor, the controller of the N/2-1 terminal breakpoint detection unit controls to close the third switch, and controls to open the third switch at intervals of 10 seconds;

5) Follow steps 3) and 4) until the location of the breakpoint is found;

6) If there is no reading on the DC ammeter when the first switch and the second switch are closed, it means that the breaking point is on the first conductor; conductor; if the second switch and the third switch are closed, the DC ammeter has no reading, indicating that the breakpoint is in the third conductor, so as to find out which conductor the breakpoint is located in.

Claims (6)

1. high voltage power transmission power cable, including 3 conductors, conductor shield, insulating barrier, protective layers；Lead Body screen layer is arranged on the outside of conductor, and insulating barrier is arranged on the outside of conductor shield, and 3 conductors are arranged at In protective layer；It is characterized in that, also include that cylindrical fixture, cylindrical fixture are positioned at protective layer； The side spaced set of described cylindrical fixture has 3 circular grooves；3 described conductors divide It is not positioned at circular groove；The cavity formed between described conductor, cylindrical fixture, protective layer is filled Insulation filler；

Also include far-end breaking point detection unit, N number of terminal breaking point detection unit；Described N number of terminal breakpoint inspection Survey unit spaced set on high voltage power transmission power cable line；N≥2；

Described far-end breaking point detection unit include master controller unit, total wireless communication unit, keyboard unit, Display unit；Total wireless communication unit, keyboard unit, display unit respectively with the I/O port of master controller unit It is connected；

Described terminal breaking point detection unit include 3 conductiving metal strips, the first switch, second switch, the 3rd Switch, controller unit, wireless communication unit；

Wherein, 3 conductors are named: the first conductor, the second conductor, the 3rd conductor；3 conductiving metal strips Named: the first conductiving metal strip, the second conductiving metal strip, the 3rd conductiving metal strip；

First conductiving metal strip passes conductor shield, insulating barrier, protective layer, the one of the first conductiving metal strip End electrical connection the first conductor, the other end is positioned at the outside of protective layer and the input of the first switch of electrical connection simultaneously Input with second switch；

Second conductiving metal strip passes conductor shield, insulating barrier, protective layer, one end of the second conductiving metal strip Electrically connect the second conductor, the other end be positioned at protective layer outside and simultaneously electrical connection first switch output and The input of the 3rd switch；

3rd conductiving metal strip passes conductor shield, insulating barrier, protective layer, one end of the 3rd conductiving metal strip Electrically connect the 3rd conductor, the other end be positioned at protective layer outside and electrically connect simultaneously second switch output and The output of the 3rd switch；

Described the first conductiving metal strip, the second conductiving metal strip, the outer surface of the 3rd conductiving metal strip are respectively provided with There is insulating barrier；

First switch, second switch, the 3rd switch all contain control end, the first switch, second switch, the 3rd The end that controls of switch is connected with the I/O port of controller unit respectively；

Controller unit and master controller unit communication；

Wherein, described conductor uses aluminum alloy materials to be prepared from, and the weight proportion of this aluminum alloy materials is as follows: Aluminium: 1000 parts；Lutetium: 1-4 part；Manganese: 12-15 part；

After above-mentioned weight proportion preparation aluminium alloy stock, first, smelting temperature is 830 DEG C, through stirring, Hexachloro-benzene refinery by de-gassing, uses conticaster direct casting, and direct casting becomes the aluminium alloy cast ingot of Φ 120mm；

Then, extruder is used to make the aluminium alloy rod of Φ 35mm 420 DEG C of hot extrusions；

Subsequently, the annealing of 50 hours is carried out at 420 DEG C；

Finally, use drawing machine by the drawing of 8 times, be prepared as the aluminium lutetium manganese alloy wire of Φ 4mm.

High voltage power transmission power cable the most according to claim 1, it is characterised in that described is the most wireless Communication unit, wireless communication unit all use gprs communication module.

High voltage power transmission power cable the most according to claim 1, it is characterised in that described display list Unit uses numeral method.

High voltage power transmission power cable the most according to claim 1, it is characterised in that described master control Device unit and controller unit all use MSP430 single-chip microcomputer.

High voltage power transmission power cable the most according to claim 1, it is characterised in that described first opens Pass, second switch, the 3rd switch all use relay.

High voltage power transmission power cable the most according to claim 1, it is characterised in that described first opens Pass, second switch, the 3rd switch all use controlled thyristor.