CN104766662B - Electric power system anti-theft high-voltage is transmitted electricity power cable - Google Patents

Abstract

The invention discloses an anti-theft high-voltage transmission power cable for a power supply system, which comprises three wire cores, an insulating layer, a shielding layer, and a protective layer; the three wire cores are tangent in pairs, and an insulating isolation layer is arranged between the wire cores; three wire cores The outside of the wire core is provided with an insulating layer, a shielding layer, and a protective layer in sequence; the outside of the three wire cores is fixed together by a fixed rope; a certain distance is kept between the insulating layer and the wire core, and the wire core and the insulating layer are fixed by a support frame so that The wire core will not slide; it also includes wires, a first DC power supply, a second DC power supply, a first current detection unit, a second current detection unit, a field controller unit, a first wireless communication unit, a second wireless communication unit, The remote controller unit; the voltage at both ends of the first DC power supply is equal to the voltage at both ends of the second DC power supply; the anti-theft high-voltage transmission power cable provided by the invention effectively protects the safety of the transmission line.

Description

Anti-theft high-voltage transmission power cables for power supply systems

technical field

The invention relates to an anti-theft high-voltage power transmission power cable, which belongs to the technical field of high-voltage power transmission.

Background technique

The wire and cable industry is the second largest industry in China after the automobile industry, and the product variety satisfaction rate and domestic market share both exceed 90%. Worldwide, China's wire and cable output has surpassed that of the United States, becoming the world's largest producer of wire and cable. With the rapid development of China's wire and cable industry, the number of new enterprises has been increasing, and the overall technical level of the industry has been greatly improved. 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.

The power cable can be divided into two parts from the structure: the core and the protective layer (the protective layer refers to the insulating layer, the shielding layer and the protective layer). The innermost core is used to transmit electric energy, and the protective layer wrapped around the core has The multi-layer structure realizes the functions of shielding, insulation and anti-damage by external force respectively. In high-voltage and above transmission and distribution networks, due to the high voltage, the theft of live cables often leads to casualties. Therefore, the theft of power lines by thieves is not aimed at the copper of the wires. In the past year, there have been many cases of 10kV The incident of theft of the protective layer of power cables. Since the cable laying is hidden and there is no monitoring system, the theft of the cable protective layer will not cause power outages and short circuit accidents, but it will leave a great potential safety hazard. After the protective layer of some cables is stolen, although no power outages or casualties have occurred temporarily, the insulation protection level of the cables has dropped significantly, and operating overvoltages, lightning overvoltages, harmonic overvoltages, people trampling, and rat bites will trigger short circuits. A short-circuit explosion of a certain phase often causes multiple feeder lines laid in the same ditch to short-circuit at the same time, causing a large-scale power outage. It can be seen that thieves have planted many serious safety hazards in the power system. Due to the fact that many cables with their protective layers stolen are buried underground, the electric power department has no special equipment to monitor the safety of the cables. The safety of personnel and the environment is seriously threatened.

The heat dissipation effect of the existing high-power three-core power cables is very poor. How to solve the heat dissipation problem of high-power power cables is a very valuable research topic.

Through the above description, it can be found that when thieves steal the protective layer of power cables, they can immediately know that there is a theft happening, which is a very worthwhile research topic.

Contents of the invention

The technical problem to be solved by the present invention is: it is difficult to be found when thieves steal the protective layer of the high-voltage transmission power cable, which leaves a great potential safety hazard for the transmission line. You know right away that a theft is taking place. The existing high-power three-core power cable has poor heat dissipation effect.

In order to solve the above technical problems, the technical solution adopted in the present invention is: an anti-theft high-voltage transmission power cable for power supply system, including three wire cores, an insulating layer, a shielding layer, and a protective layer; An insulating layer is set between the cores; an insulating layer, a shielding layer, and a protective layer are arranged on the outside of the three cores in sequence; the outside of the three cores is fixed together by a fixed rope; a certain distance is kept between the insulating layer and the core, and the core and the The insulation layer is fixed by the support frame so that the core will not slide;

It also includes wires, a first DC power supply, a second DC power supply, a first current detection unit, a second current detection unit, a field controller unit, a first wireless communication unit, a second wireless communication unit, a remote controller unit, Alarm unit, display unit; the voltage at both ends of the first DC power supply is equal to the voltage at both ends of the second DC power supply;

The wire is arranged in the protective layer, and the two ends of the wire are respectively located at the two ends of the anti-theft high-voltage transmission power cable;

One end of the wire is electrically connected to the positive pole of the first DC power supply, the negative pole of the first DC power supply is electrically connected to one end of the first current detection unit, and the other end of the first current detection unit is used for grounding;

The other end of the wire is electrically connected to the positive pole of the second DC power supply, the negative pole of the second DC power supply is electrically connected to one end of the second current detection unit, and the other end of the second current detection unit is used for grounding;

The digital signal output end of the first current detection unit and the digital signal output end of the second current detection unit are respectively connected to the IO port of the field controller unit;

The first wireless communication unit is electrically connected to the field controller unit;

The second wireless communication unit is electrically connected to the remote controller unit;

The field controller unit communicates with the remote controller unit through the first wireless communication unit and the second wireless communication unit;

The alarm unit and the display unit are respectively electrically connected to the remote controller unit.

Further, the alarm unit adopts sound and light alarm.

Further, the display unit adopts LED display screen.

Further, both the first current detection unit and the second current detection unit adopt digital DC ammeters with digital output ports.

Further, the first wireless communication unit and the second wireless communication unit adopt a GPRS module.

Further, both the field controller unit and the remote controller unit adopt ATmega16 single-chip microcomputer.

Compared with the prior art, the present invention has the following advantages: First, the anti-theft high-voltage transmission power cable provided by the present invention can immediately know that a theft is taking place when the thief steals the protective layer of the power cable, and effectively and timely protects the power cable. The safety of the power transmission line; at the same time, because the thief must first destroy the protective layer if he wants to steal the core, the power cable of the present invention also effectively prevents the thief from stealing the core of the power cable. Second, the circuit of the anti-theft part of the present invention does not consume electric energy before the wire is stolen. Thirdly, the heat dissipation effect of the three-core power cable of the present invention is very good.

Description of drawings

Fig. 1 is a structural schematic diagram of an anti-theft high-voltage transmission power cable for a power supply system of the present invention.

Fig. 2 is a schematic diagram of the principle of the theft point monitoring circuit of the present invention.

Among them, 1 is the wire core, 2 is the insulating layer, 3 is the shielding layer, 4 is the protective layer, and 5 is the wire.

detailed description

The invention will be described in further detail below in conjunction with the accompanying drawings.

Specific embodiment 1: with reference to Fig. 1, 2, a kind of anti-theft high-voltage power transmission power cable comprises three wire cores, insulating layer, shielding layer, protective layer; Three wire cores are tangent in pairs, and insulation is provided between the wire cores Isolation layer; the outside of the three wire cores is provided with an insulating layer, a shielding layer, and a protective layer in sequence; the outside of the three wire cores are fixed together by a fixed rope; a certain distance is kept between the insulating layer and the wire core, and the wire core and the insulating layer pass through The support frame is fixed so that the wire core will not slide; it also includes wires, a first DC power supply, a second DC power supply, a first current detection unit, a second current detection unit, a field controller unit, a first wireless communication unit, a second A wireless communication unit, a remote controller unit, an alarm unit, and a display unit; the voltage at both ends of the first DC power supply is equal to the voltage at both ends of the second DC power supply;

The wire is arranged in the protective layer, and the two ends of the wire are respectively located at the two ends of the anti-theft high-voltage transmission power cable; one end of the wire is electrically connected to the positive pole of the first DC power supply, and the negative pole of the first DC power supply is electrically connected to the One end of the first current detection unit, the other end of the first current detection unit is used for grounding; the other end of the wire is electrically connected to the positive pole of the second DC power supply, and the negative pole of the second DC power supply is electrically connected to one end of the second current detection unit. The other end of the second current detection unit is used for grounding; the digital signal output end of the first current detection unit and the digital signal output end of the second current detection unit are respectively connected to the IO port of the field controller unit; the first wireless communication unit and the field control The second wireless communication unit is electrically connected to the remote controller unit; the field controller unit communicates with the remote controller unit through the first wireless communication unit and the second wireless communication unit; the alarm unit and the display unit communicate with the remote controller unit respectively The remote controller unit is electrically connected.

Among them, the alarm unit adopts sound and light alarm. The display unit adopts LED display. Both the first current detection unit and the second current detection unit are digital DC ammeters with digital output ports. The first wireless communication unit and the second wireless communication unit use a GPRS module. Both the field controller unit and the remote controller unit adopt ATmega16 single-chip microcomputer.

Specific embodiment 2: the display unit, the alarm unit, the second wireless communication unit and the remote controller unit can be realized by using a smart phone.

The present invention can realize the principle description of the theft point monitoring: no matter the wire core of the thief steals the power cable, or the protective layer of the stolen power cable (the protective layer includes an insulating layer, a shielding layer and a protective layer), it is necessary to first destroy the protective layer. Destroying the covering will definitely destroy the wires. Since the two ends of the wire are respectively connected to the positive poles of the first DC power supply and the second DC power supply, and the voltages of the first DC power supply and the second DC power supply are equal, no current will be generated in the wire. Once the thief steals the power cable If the wire is cut, the wire will be cut first. The moment the wire is cut with metal scissors, it is equivalent to the grounding point through the metal scissors and the human body (because the protective layer of the power cable generally uses a lot of cotton and rubber materials, it is difficult to destroy it. , so thieves must use metal scissors, and metal scissors generally have no insulation function). At this time, the wire that does not generate current will generate current at this moment, and the direction of the current is from the positive pole of the first DC power supply and the second DC power supply to the direction of the shearing point. At the moment of cutting, both the first current detection unit and the second current detection unit will detect the current. After the field controller unit detects the current generated by the wire, it will immediately send an alarm signal to the remote controller unit, and the remote controller unit will receive the alarm. After the signal, the control alarm unit sends out sound and light alarm. The wire inside the protective layer of the power cable of the present invention is equivalent to grounding at the moment of cutting, and the position and distance of the cutting point can be easily calculated according to the resistivity, wire diameter, detected current and voltage of the DC power supply of the wire. Therefore, the present invention can not only know that a theft is taking place at the first time, but also calculate the location of the theft at the first time.

Claims (1)

1. electric power system anti-theft high-voltage transmits electricity power cable it is characterised in that including three cores, insulation Layer, screen layer, protective layer；Three cores are tangent two-by-two, arrange dielectric isolation layer between core and core；Three The outside of root core sets gradually insulating barrier, screen layer, protective layer；Fixed by static line outside three cores Together；Maintain a certain distance between insulating barrier and core, fixed by bracing frame between core and insulating barrier Core will not be slided；

Also include wire, the first DC source, the second DC source, the first current detecting unit, the second electric current Detector unit, field controller unit, the first wireless communication unit, the second wireless communication unit, remote control Device unit, alarm unit, display unit；The voltage at the first DC source two ends is equal to the second DC source two ends Voltage；

Described wire is arranged in protective layer, and the two ends of wire are located at described anti-theft high-voltage transmission of electricity electric power electricity respectively The two ends of cable；

One end of wire electrically connects the positive pole of the first DC source, and the negative pole of the first DC source electrically connects the first electric current One end of detector unit, the other end of the first current detecting unit is used for being grounded；

The other end of wire electrically connects the positive pole of the second DC source, negative pole electrical connection second electricity of the second DC source One end of stream detector unit, the other end of the second current detecting unit is used for being grounded；

The digital signal output end of the first current detecting unit and the digital signal output end of the second current detecting unit Connect the I/O port of field controller unit respectively；

First wireless communication unit is electrically connected with field controller unit；

Second wireless communication unit is electrically connected with remote controller unit；

Field controller unit passes through the first wireless communication unit, the second wireless communication unit and remote controller unit Communication；

Alarm unit, display unit are electrically connected with remote controller unit respectively；

Described alarm unit adopts sound and light alarm；

Described display unit adopts LED display；

First current detecting unit, the second current detecting unit are all using the digital DC with digital output port Ammeter；

The first described wireless communication unit, the second wireless communication unit adopt GPRS module；

Field controller unit, remote controller unit are all using ATmega16 single-chip microcomputer.