CN103296629A - Ground wire DC (direct current) deicing method based on discharge gap insulator - Google Patents

Abstract

The invention provides a ground wire DC deicing method based on a discharge gap insulator. The ground wire DC deicing method based on the discharge gap insulator comprises the steps of (1) searching an ice-covered overhead ground wire; (2) connecting a piece of insulator between the overhead ground wire and an iron tower in series; (3) connecting a fitting or an arrester between the insulator and the iron tower in parallel; (4) shortcircuiting the tail end of a double-circuit insulation overhead ground wire of a discharge gap; (5) configuring a DC deicing device; (6) disconnecting the grounding of a head end and a tail end of the insulation overhead ground wire; (7) starting the DC deicing device; (8) closing the DC deicing device during ice shedding; (9) disconnecting and grounding the double-circuit insulation overhead ground wire; and (10) disconnecting and grounding the shortcircuited tail end of the double-circuit insulation overhead ground wire. The ground wire DC deicing method based on the discharge gap insulator has the advantages of effectively avoiding line breaking and tower collapse, improving the efficiency and the safety of ground wire deicing and greatly reducing the system capacity required by deicing.

Description

A kind of ground wire DC ice melting method based on the discharging gap insulator

Technical field

The invention belongs to the electrical engineering technical field, relate in particular to a kind of ground wire DC ice melting method based on the discharging gap insulator.

Background technology

In recent years, the outburst of electric power system ice damage is frequent, and the transmission line broken string of falling tower phenomenon is serious, has brought enormous economic loss to China, has had a strong impact on the people's production and life simultaneously.

Coming into operation of deicing device thoroughly changed the situation that transmission line in the past can only passive anti-ice in face of ice damage, alleviated the condition of a disaster, prevented from falling the generation of tower, broken string accident.But it is pointed out that present ice-melt mainly is to carry out at lead, and ground wire, owing to adopt graded insulation or direct grounding way, service conditions limits to some extent so fail to implement ice-melt.

Analyze from the damaged condition of ice damage accident in recent years, though overhead ground wire and lead are located under same temperature, humidity, the wind speed environment, but can produce heat energy to resist part freezing because having load current on the transmission line, so the transmission pressure head and shoulders above of the ice covering thickness on the overhead ground wire.When the icing on the overhead ground wire acquires a certain degree, cause that lead wire and earth wire broken string, gold utensil come off, insulator rupture, tower or because of the sag deficiency to line discharge.Because power telecom network is compounded in the overhead ground wire at present, if there are not effective ice-melt means, the ground thread breakage will cause power communication channel to interrupt the normal operation that jeopardizes electric control system.Therefore, realize that the overhead ground wire DC ice melting to improving the whole anti-icing ability of transmission line, ensures that the reliability of mains supply has very important meaning.

Summary of the invention

The technical problem to be solved in the present invention is: be subjected to the restriction of the service conditions of graded insulation or direct grounding way can't implement the defective of ice-melt at present overhead ground wire, a kind of ground wire DC ice melting method based on the discharging gap insulator is provided, like this, when overhead ground wire generation icing, use this method to implement DC ice melting to it, improve overhead ground wire thus and resist the freezing ability of sleet, guarantee the fail safe of overhead ground wire under serious icing situation.

Technical scheme of the present invention is that a kind of ground wire DC ice melting method based on the discharging gap insulator that provides comprises the steps:

(1), enters and treat that the ice-thawing electric transmission line region searches for the icing overhead ground wire of transmission line in this zone;

(2), a slice insulator of between icing overhead ground wire that step (1) searches out and iron tower of power transmission line, connecting, make described icing overhead ground wire be transformed into insulated static wire;

(3), between the iron tower of the insulator of step (2) insulated static wire that obtains and the described transmission line of step (2) gold utensil in parallel or a lightning arrester, make and produce a discharging gap between this iron tower and the insulated static wire.Because the thunder and lightning punch-through effect in this gap makes described iron tower therefore possess lightning protection function;

(4), two ends of declining the edge overhead ground wire of the discharging gap that step (3) is produced carry out short circuit;

(5), the configuring direct current deicing device is one.With step (3) described two decline one in the edge overhead ground wire decline the edge overhead ground wire be connected to join the positive pole of DC de-icing device, another decline the edge overhead ground wire be connected to join the negative pole of DC de-icing device;

(6), disconnect the ground connection of above-mentioned insulated static wire head end and the ground connection of above-mentioned insulated static wire end respectively;

(7), setting up procedure (5) joins DC de-icing device, adjusts the DC ice melting current value of this DC de-icing device output to setting the ice melting current value, record ice-melt time started and output DC flow valuve;

(8), observe the icing on the described insulated static wire, when the icing on the observed insulated static wire comes off fully, close described DC de-icing device, the record ice-melt concluding time;

(9), be connected in the break step (5) one of DC de-icing device positive pole decline be connected in edge overhead ground wire and the step (5) join the DC de-icing device negative pole another decline the edge overhead ground wire, respectively this two is declined edge overhead ground wire ground connection;

(10), disconnect and to be declined edge overhead ground wire end by two of step (4) short circuit, respectively this two is declined the terminal ground connection of edge overhead ground wire.

The invention has the beneficial effects as follows:

1), can realize that ground wire is at the insulation of icing phase ground wire and shaft tower during DC ice melting, the broken string of falling the tower of having avoided ground wire to take place because of icing effectively;

2), the normal function of overhead ground wire, the efficient and the fail safe that have improved ground wire deicing have simultaneously been kept;

3), adopt DC de-icing device that ground wire is carried out ice-melt, greatly reduce the needed power system capacity of ice-melt, can be to carrying out ice-melt than the long transmission line ground wire.

Embodiment

Embodiment 1:

(1), enters and treat that the ice-thawing electric transmission line region searches for the icing overhead ground wire of transmission line in this zone;

(2), a slice insulator of between icing overhead ground wire that step (1) searches out and iron tower of power transmission line, connecting, make described icing overhead ground wire be transformed into insulated static wire;

(3), a gold utensil in parallel between the iron tower of the insulator of step (2) insulated static wire that obtains and the described transmission line of step (2);

(4), two ends of declining the edge overhead ground wire of the discharging gap that step (3) is produced carry out short circuit;

(5), the configuring direct current deicing device is one.With step (3) described two decline one in the edge overhead ground wire decline the edge overhead ground wire be connected to join the positive pole of DC de-icing device, another decline the edge overhead ground wire be connected to join the negative pole of DC de-icing device;

(6), disconnect the ground connection of above-mentioned insulated static wire head end and the ground connection of above-mentioned insulated static wire end respectively;

(7), setting up procedure (5) joins DC de-icing device, adjusts the DC ice melting current value of this DC de-icing device output to setting the ice melting current value;

(8), observe the icing on the described insulated static wire, when the icing on the observed insulated static wire comes off fully, close described DC de-icing device;

(9), be connected in the break step (5) one of DC de-icing device positive pole decline be connected in edge overhead ground wire and the step (5) join the DC de-icing device negative pole another decline the edge overhead ground wire, respectively this two is declined edge overhead ground wire ground connection;

(10), disconnect and to be declined edge overhead ground wire end by two of step (4) short circuit, respectively this two is declined the terminal ground connection of edge overhead ground wire.

Embodiment 2:

Step (1)～(2) are with embodiment 1;

(3), a lightning arrester in parallel between the iron tower of the insulator of step (2) insulated static wire that obtains and the described transmission line of step (2);

Step (4)～(10) are with embodiment 1.

It is respond well that a kind of ground wire DC ice melting method based on the discharging gap insulator of above-described embodiment is practiced the proof ice-melt through reality, reaches expected design fully, and simple to operate.Use this method to carry out overhead ground wire ice-melt work, can implement the overhead ground wire ice-melt effectively, improve the whole anti-icing ability of transmission line, ensure that mains supply is safe and reliable.

Claims (1)

1. ground wire DC ice melting method based on the discharging gap insulator, this method comprises the steps:

(1), enters and treat that the ice-thawing electric transmission line region searches for the icing overhead ground wire of transmission line in this zone;

(2), a slice insulator of between icing overhead ground wire that step (1) searches out and iron tower of power transmission line, connecting, make described icing overhead ground wire be transformed into insulated static wire;

(3), a gold utensil in parallel or a lightning arrester between the iron tower of the insulator of step (2) insulated static wire that obtains and the described transmission line of step (2);

(4), two ends of declining the edge overhead ground wire of the discharging gap that step (3) is produced carry out short circuit;

(5), one of configuring direct current deicing device, with step (3) described two decline one in the edge overhead ground wire decline the edge overhead ground wire be connected to join the positive pole of DC de-icing device, another decline the edge overhead ground wire be connected to join the negative pole of DC de-icing device;

(6), disconnect the ground connection of above-mentioned insulated static wire head end and the ground connection of above-mentioned insulated static wire end respectively;

(7), setting up procedure (5) joins DC de-icing device, adjusts the DC ice melting current value of this DC de-icing device output to setting the ice melting current value;

(8), observe the icing on the described insulated static wire, when the icing on the observed insulated static wire comes off fully, close described DC de-icing device;

(9), be connected in the break step (5) one of DC de-icing device positive pole decline be connected in edge overhead ground wire and the step (5) join the DC de-icing device negative pole another decline the edge overhead ground wire, respectively this two is declined edge overhead ground wire ground connection;

(10), disconnect and to be declined edge overhead ground wire end by two of step (4) short circuit, respectively this two is declined the terminal ground connection of edge overhead ground wire.