CN101350234B - Outer layer insulated single-wire round wire concentric stranded overhead wire and automatic ice-melting device - Google Patents

Abstract

The invention discloses an outer-layer single-wire insulated round wire concentric stranded overhead wire and an automatic ice-melting device, belonging to the wire and the ice-melting device, and aims to provide a wire and an ice-melting device matched with the wire. The conductor is composed of an inner layer bare wire concentric twisted wire group (1) and an outer layer insulated concentric twisted wire group (2). The composition of the device is: the short-circuited two sections of wires are firmly connected to the two insulators (6), and the tension switch (7) is connected between the two insulators (6); After the insulated wires are connected in parallel, they are connected by the drain wire (13) connected in series with the current shunt device (9), and the inner layer bare wire concentric twisted wire group (1) and the remaining insulated wires are connected in parallel by the tripping contact of the automatic circuit breaker ( 12) connected, the current shunt device (9) is connected in series with the automatic circuit breaker coil (11), the tension switch (7) is connected in parallel with the temperature control switch (10), and the trip control circuit (14) is connected in parallel with the automatic circuit breaker coil (11) ends.

Description

Outer layer insulated single-wire round wire concentric stranded overhead wire and automatic ice-melting device

Technical field: the present invention relates to a power transmission wire, in particular to a round wire concentric stranded overhead wire used for power transmission and distribution lines; the invention also relates to a power line melting device, in particular to a The automatic ice-melting device used in conjunction with the wire. the

BACKGROUND OF THE INVENTION: At present, in the overhead lines for power transmission and distribution, the commonly used power transmission wires are round concentric twisted overhead wires; they are composed of several bare wires twisted together. Although the structure of the traditional round wire concentric twisted overhead conductor is simple, it is difficult to remove the ice when the line is heavily iced in freezing weather. Generally, only inspection along the line and manual beating can be used for deicing, which not only has low efficiency and unsatisfactory deicing effect, but also requires a power outage to operate; There is enough electricity available for dispatching, which is difficult to achieve in the current situation of relatively tight power supply; if the special transformer ice melting technology is used, an isolation switching circuit must be added in the substation, which is not only costly, but also requires a power outage . In addition, because the bare wires in the traditional round concentric stranded overhead conductors cannot be divided into two branches, they cannot be shunted; It is not economical to melt the ice of the line without segmental ice melting of the line, and the power loss is serious. the

Summary of the invention: Aiming at the above-mentioned defects in the prior art, the present invention aims to provide an outer-layer insulated single-wire round wire concentric stranded overhead conductor; another object of the present invention is to provide an automatic ice-melting Device: By using the wire and the automatic ice-melting device of the present invention, automatic deicing can be realized in sections without power failure. the

In order to achieve the above object, the technical scheme adopted by the wire of the present invention is as follows: it includes an inner layer bare wire concentric twisted wire group twisted by several bare wires; it is characterized in that: the inner layer bare wire concentric twisted wire group The outer surface of the outer layer is wrapped with a layer of insulated concentric strands formed by twisting several insulated wires. the

The technical scheme of the automatic ice-melting device of the present invention is as follows: two insulators are located between the two sections of the outer-layer insulated single-wire round wire concentric-stranded overhead conductor, and the two outer-layer insulated single-wire round wire concentric-stranded overhead conductors after parallel short-circuiting They are respectively fixedly connected with two insulators, and the two tension switches are fixedly connected in series between the two insulators through ropes; the outer insulated concentric twisted wire groups of the left and right outer insulated single-wire round wires and concentric stranded overhead conductors are connected separately. A group of the insulated wires drawn out from the center are connected in parallel to form a normally open branch circuit. The current diversion device is connected in series on the drain wire, and the inner layer of the left and right outer layer insulated single-wire round wire The bare wire concentric twisted wire group and the remaining insulated wires in the outer insulated concentric twisted wire group are connected in parallel to form a trip branch circuit through the trip contact of the automatic circuit breaker. The current shunt device is connected in series with the coil of the automatic circuit breaker to form a trip circuit. After two tension switches are connected in series, they are connected in parallel with the temperature control switch to form a trip control loop, and the trip control loop is connected in parallel at both ends of the coil of the automatic circuit breaker. the

When the current in the transmission line is AC, the current shunt device is a current transformer; when the current in the transmission line is direct current, the current shunt device is a DC shunt. the

Compared with the prior art, the wire of the present invention adds a layer of outer insulated concentric twisted wire group twisted by several insulated wires on the outer surface of the round wire concentric stranded overhead wire of the traditional structure, so it can be connected between the insulated wire and the Between the insulated wires, or between the insulated wires and the bare wires, a parallel circuit is formed by short-circuiting; according to the characteristic that the wires of the present invention can form a parallel circuit after short-circuiting, the automatic ice-melting device of the present invention uses two The normal branch and the trip branch are connected in parallel, and the trip control circuit composed of the tension switch and the temperature-air switch is used to control the action of the automatic circuit breaker coil, so when the trip contact of the automatic circuit breaker cuts off the trip branch When the wire is on the road, the current in the wire of the present invention is all concentrated in the normally connected branch to make it generate heat, so that automatic ice melting can be realized without power failure. The invention not only can automatically heat and melt the transmission line in sections, effectively overcomes the defects of large power loss, high cost and poor effect of the traditional deicing method; it can also automatically heat the transmission line under extremely low temperature weather conditions , thereby releasing the huge tension generated by the conductor due to thermal expansion and contraction, ensuring the safe and reliable operation of the transmission line.

Description of drawings:

Fig. 1 is the structural representation of wire of the present invention;

Fig. 2 is a structural schematic diagram of the automatic ice-melting device of the present invention. the

In the figure: Inner layer bare wire concentric twisted wire group 1 Outer layer insulated concentric twisted wire group 2 Short-circuit connection device 3 Normal branch circuit 4 Trip branch circuit 5 Insulator 6 Tension switch 7 Cable 8 Current shunt device 9 Temperature control switch 10 Automatic Circuit breaker coil 11 Automatic circuit breaker trip contact 12 Drain wire 13 Trip control circuit 14 Trip circuit 15

The specific embodiment: the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

As shown in Figure 1: the inner layer bare wire concentric stranded wire group 1 is composed of several bare wires twisted together, and the outer surface of the inner layer bare wire concentric stranded wire group 1 is wrapped with an outer layer of insulated concentric stranded wire group 2. The outer insulated concentric twisted wire group is formed by twisting several insulated wires arranged on the outer surface of the inner layer bare wire concentric twisted wire group 1 . the

As shown in Figure 2: the wire of the present invention in Fig. 1 is divided into two sections on the left and right, respectively by the above-mentioned two sections of wires connected in parallel by the short-circuit connecting device 3 and two insulators 6 between the two sections of wires respectively. The two tension switches 7 are fixedly connected in mechanical way, and the two tension switches 7 are fixedly connected in series between the two insulators 6 through the cables 8 in a mechanically connected way. One group of insulated wires drawn out from the outer layer insulated concentric twisted wire group 2 of the lead of the present invention on the left section is electrically connected with one end of the drain wire 13 after being connected in parallel; A group of insulated wires drawn out of the wire group 2 are connected in parallel with the other end of the drain wire 13 to form a normal branch 4, and the drain wire 13 is connected in series with a current shunt device 9; the inner layer of the wire of the present invention on the left section The bare wire concentric twisted wire group 1 and the remaining insulated wires in the outer layer insulated concentric twisted wire group 2 are electrically connected to a contact point of the automatic circuit breaker tripping contact 12, and the inner layer of the wire of the present invention on the right section is bare The concentric twisted wire group 1 and the remaining insulated wires in the outer insulated concentric twisted wire group 2 are connected in parallel and then electrically connected to the other contact of the trip contact 12 of the automatic circuit breaker to form a tripping branch 5; the current shunt device 9 It is connected in series with the automatic circuit breaker coil 11 to form a trip circuit 15 , and the two tension switches 7 are connected in parallel with the temperature control switch 10 to form a trip control circuit 14 , which is connected in parallel at both ends of the automatic circuit breaker coil 11 . the

In the above embodiments, when the current in the transmission line is AC, the current splitter 9 is a current transformer; when the current in the transmission line is DC, the current splitter 9 is a DC shunt. the

Working principle: when the temperature is lower than 0°C, the temperature control switch 10 is open, and when the ice thickness of the line reaches the set value of the wire tension (or when the wire tension reaches the set value under extremely low temperature weather conditions), the two A tension switch 7 is open circuit; at this time, the trip control circuit 14 is in an open circuit state, and the secondary current of the current transformer in the trip circuit 15 or the shunt current of the DC shunt passes through the automatic circuit breaker coil 11 to supply power, and the automatic circuit breaker The trip contact 12 trips and cuts off the trip branch 5, so all the current in the lead of the present invention flows through the normally connected branch 4 in concentration; The active power loss of road 4 is far greater than the active power loss of the normal state of the wire of the present invention, so the heat generated by the normally connected branch 4 will melt the ice (or the whole wire of the invention will be heated by heat conduction and released due to low temperature) tension). When the temperature is higher than 0°C or the tension of the transmission line is lower than the set value, the temperature control switch 10 or the two tension switches 7 are closed, the coil 11 of the automatic circuit breaker is short-circuited and loses power, the tripping contact 12 of the automatic circuit breaker is closed, and the tripping support Road 5 is connected; then the power transmission line of this section resumes normal operation.

Claims (4)

1. A concentric stranded overhead conductor of an outer layer insulated single-wire round wire, comprising an inner layer bare wire concentric twisted wire group formed by twisting a plurality of bare wires; it is characterized in that: an inner layer bare wire concentric twisted wire group (1 ) is wrapped with an outer insulated concentric twisted wire group (2) formed by twisting a plurality of insulated wires. 2. An automatic ice-melting device matched with the outer-layer insulated single-wire round wire concentric-stranded overhead conductor according to claim 1, characterized in that: it is located between two sections of the outer-layer insulated single-wire round wire concentric-stranded overhead wire The two insulators (6) are respectively fixedly connected to one end of the corresponding outer-layer insulated single-wire round wire concentric-stranded overhead conductor, and the inner-layer bare-wire concentric-stranded wire group (1 ) and the outer insulated concentric twisted wire group (2) wrapped on its outer surface are connected in parallel and shorted, and the two tension switches (7) are fixed and connected in series between the two insulators (6) through cables (8); A set of insulated wires drawn from the outer insulated concentric twisted wire group (2) of the two outer-layer insulated single-wire round wires of the left and right sections of the overhead conductor are paralleled and connected through the drain wire (13) to form a normal branch (4), the current shunt device (9) is connected in series on the drain wire (13), the inner layer bare wire concentric twisted wire group (1) of the left and right outer layer insulated single wire round wire concentric twisted overhead conductors and the outer layer The remaining insulated wires in the insulated concentric twisted wire group (2) are connected in parallel through the trip contact (12) of the automatic circuit breaker to form a trip branch (5), the current shunt device (9) and the coil of the automatic circuit breaker (11) A trip circuit (15) is formed in series, and two tension switches (7) are connected in parallel with the temperature control switch (10) to form a trip control circuit (14), which is connected in parallel at both ends of the automatic circuit breaker coil (11); Each tension switch (7) is a normally closed switch that can automatically open when the tension reaches a predetermined value, and the temperature control switch (10) is a normally closed switch that can automatically open when the temperature is lower than 0°C. 3. The automatic ice-melting device according to claim 2, characterized in that: the current shunt device (9) is a current transformer. 4. The automatic ice-melting device according to claim 2, characterized in that the current shunt device (9) is a DC shunt. the

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