CN206364479U - A kind of device that DC ice melting is carried out to power transmission line overhead ground wire - Google Patents

Abstract

A kind of device that DC ice melting is carried out to power transmission line overhead ground wire, including N number of segmentation tower, aerial earth wire, three-phase ac power supply, DC de-icing device, the first wire, the second wire, segmentation ground wire, grounding switch KG, automatic connection device KN；Described aerial earth wire insulation against ground and segmentation is grounded by multiple grounding switch KG, each described segmentation tower is by automatic connection device KN by the first wire or the second wire and aerial earth wire short circuit, minimum one section of segmentation ground wire in parallel or minimum one section of segmentation ground wire of connecting at each short circuit, described automatic connection device KN control to be opened and closed by signal.Advantage is that ground wire deicing line short circuit time and short-circuit device expense can be made to reduce more than 1 times, and ice-melt segmentation selection flexibility is greatly improved, it is to avoid is needed to the disconnection of optical cable in OPGW ground wires and is continued for ice-melt, reduces line upkeep cost.

Description

A kind of device that DC ice melting is carried out to power transmission line overhead ground wire

Technical field

The utility model is related to a kind of power transmission line overhead ground wire DC ice melting technical field, particularly a kind of to transmission of electricity Fixed track usage plan ground wire carries out the device of DC ice melting.

Background technology

In recent years, there is the low temperature sleet and snow ice of large area again and again in south China area winter caused by climate change Disaster, the normal operation to power network causes very serious influence.What transmission pressure icing was caused break, short circuit, falls tower very Long to accident repair times such as system sectionalizings, labor intensive is big.Wherein, it is the tightest with the icing situation of aerial earth wire in power network Weight.Therefore, the anti-ice technology of aerial earth wire is of increased attention.

At present, DC ice melting mainly carries out ice-melt to AC transmission wire, because power transmission line overhead ground wire passes through shaft tower Ground connection, needs to take the technological transformation of insulation against ground to ground wire deicing, it is considered to which ground wire Insulation Transformation economy and shocking preventing technology will Ask, ground wire insulation is typically by the design of 35kV voltage class, and aerial earth wire Insulation Transformation includes ground wire insulation against ground and segmentation continues Deng costly；The D.C. resistance of ground wire is larger, is limited by DC de-icing device output voltage and ground wire insulation, and ground wire needs Ice-melt is segmented, more than 4 sections will be generally divided into long range ultrahigh-voltage alternating-current power transmission line overhead ground wire, to super high voltage direct current electricity transmission Fixed track usage plan ground wire will generally be divided into more than 9 sections.Each aerial earth wire waypoint in the ice-melt access circuit of existing aerial earth wire Physical insulation isolation is carried out using sectionaliser, needs installation fiber optic closure to ensure that signal is unimpeded to OPGW ground wires, each segmentation Point is provided with two sets of artificial short circuit interflow wire clamps in the big small size side of shaft tower, and the tower position of waypoint is fixed.More than being based on Scheme, ground wire needs to disconnect in waypoint, and reforming equipment is more, costly, and ground wire Insulation Test is difficult；During multistage ice-melt simultaneously, Each segmentation need to operate two fit streamlines to press from both sides, and the ground wire access operation time is long；Waypoint tower position is fixed, and ice-melt segmentation access is ineffective It is living；OPGW fibre junctions, add fibre loss, increase maintenance cost；Collaborating wire clamp can only be by manually on cross arm of tower Operation is completed, and operating time length, security risk are big.

Utility model content

The purpose of this utility model be in order to overcome in existing ground wire deicing exist ground wire insulation and segmentation improvement expenses it is high, The defects such as ice-melt operating time length, the utility model proposes a kind of dress that DC ice melting is carried out to power transmission line overhead ground wire Put, specific technical scheme is as follows：

A kind of device that DC ice melting is carried out to power transmission line overhead ground wire, including N number of segmentation tower, aerial earth wire, exchange Three phase mains, DC de-icing device, the first wire, the second wire, segmentation ground wire, grounding switch KG, automatic connection device KN；Institute The N number of segmentation tower stated be followed successively by segmentation tower 1, segmentation tower 2, segmentation tower 3 ..., segmentation tower N, described the first wire, second are led Line is isolated and insulation against ground with power network, and the first described wire is overlapped on the segmentation tower of odd number, described the second wire overlap joint On the segmentation tower of even number, described aerial earth wire insulation against ground and segmentation is grounded by multiple grounding switch KG, each described Segmentation tower by automatic connection device KN by the first wire or the second wire and aerial earth wire short circuit, at each short circuit it is in parallel most Few one section of segmentation ground wire or minimum one section of segmentation ground wire of connecting, described automatic connection device KN are controlled to be opened and closed by signal, handed over Stream three phase mains is connected with DC de-icing device, and the first described wire and the output cathode of DC de-icing device are connected, described The second wire and DC de-icing device output negative pole connect；Described DC de-icing device and the first wire, the second wire Access point be equipped with access disconnecting link K.

Insulation against ground transformation is implemented to aerial earth wire, access disconnecting link K and automatic connection device KN is opened during the non-ice age, is full Sufficient lightning protection requirement is grounded aerial earth wire by closing grounding switch KG, and aerial earth wire grounding switch is opened during the ice age makes built on stilts ground The insulation against ground of line all fronts, is led in ground wire waypoint during ice-melt by automatic connection device KN short circuits aerial earth wire with corresponding one Line (the first wire or the second wire), makes ice-melt sectional parallel on the first wire and the second wire；Ice-melt dress is operated during ice-melt Put output DC current and each segmentation aerial earth wire is accessed by wire, suitable DC current is injected to ground wire, ground wire heating is melted Change icing.

As the improvement of scheme one, three-phase ac power supply is 35kV or 10kV station electricity consumptions.

As the improvement of scheme one, the adjustable extent of the stable DC electric current of DC de-icing device is 100-4500A.

As the improvement of scheme one, between described segmentation ground wire or aerial earth wire the first wire of access and the second wire etc. Effect DC resistance is R, and the scope of equivalent d.c. resistance is that 1-90 Ω, ice melting current scope are 100-600A.

Each section of line resistance value of sectional parallel access is matched with its ice melting current required value, makes the ice melting current of each segmentation Between its minimum ice melting current and maximum ice melting current, and it is basic to meet the ice melting current and the product of its resistance value of each segmentation Equal, deviation is no more than 10%

As the improvement of scheme one, grounding switch KG is the 35kV classes of insulation.

As the improvement of scheme one, automatic connection device KN possesses two kinds of switching positions, in the close position during ice-melt to incite somebody to action Aerial earth wire is connected with the first wire or the second wire, and open position is in when circuit is normally run by aerial earth wire and earth point Connection.

Brief description of the drawings

Fig. 1 is the fundamental diagram of the device that DC ice melting is carried out to power transmission line overhead ground wire of embodiment 1.

Fig. 2 is the fundamental diagram of the device that DC ice melting is carried out to power transmission line overhead ground wire of embodiment 2.

Embodiment

Embodiment 1

As shown in figure 1, a kind of device that DC ice melting is carried out to power transmission line overhead ground wire, including it is 5 segmentation towers, built on stilts Ground wire, three-phase ac power supply, DC de-icing device, the first wire, the second wire, segmentation ground wire, grounding switch KG, automatic connection Device KN；5 described segmentation towers are followed successively by segmentation tower 1, segmentation tower 2... segmentation tower 5, described the first wire, the second wire Isolate with power network and insulation against ground, the first described wire short circuit point is on the segmentation tower of even number, the second described wire short circuit Point is on the segmentation tower of odd number, and described aerial earth wire insulation against ground and segmentation is grounded by multiple grounding switch KG, Mei Gesuo The segmentation tower stated by automatic connection device KN by the first wire or the second wire and aerial earth wire short circuit, it is in parallel at each short circuit Two sections of segmentation ground wires, access four sections of ground wires altogether, and described automatic connection device KN controls to be opened and closed by signal, three-phase ac power supply It is connected with DC de-icing device, the first described wire and the output cathode of DC de-icing device are connected, the second described wire It is connected with the output negative pole of DC de-icing device；The access point of described DC de-icing device and the first wire, the second wire is equal Provided with access disconnecting link K.Three-phase ac power supply is 35kV or 10kV station electricity consumptions.The stable DC electric current of DC de-icing device it is adjustable Scope is 100-4500A.The Equivalent DC electricity that described segmentation ground wire or aerial earth wire are accessed between the first wire and the second wire Resistance is R, and the scope of equivalent d.c. resistance is that 1-90 Ω, ice melting current scope are 100-600A.Each section of sectional parallel access Line resistance value is matched with its ice melting current required value, makes the ice melting current of each segmentation in its minimum ice melting current and maximum ice-melt Between electric current, and it is of substantially equal to meet the ice melting current and the product of its resistance value of each segmentation, and deviation is no more than 10%.Earthing Lock KG is the 35kV classes of insulation.Automatic connection device KN possesses two kinds of switching positions, it is in the close position during ice-melt will be built on stilts Line is connected with the first wire or the second wire, is connected aerial earth wire with earth point in open position when circuit is normally run.

Embodiment 2

As shown in Fig. 2 as different from Example 1, for the shorter particular segment (being generally less than 10km) of segmentation tower distance, By being segmented after the series connection of aerial earth wire both sides between first wire of access in parallel and the second wire.

Above-listed detailed description is illustrating for the utility model possible embodiments, and the embodiment is simultaneously not used to limitation The scope of the claims of the present utility model, all equivalence enforcements or change without departing from carried out by the utility model are intended to be limited solely by this case In the scope of the claims.

Claims (6)

1. a kind of device that DC ice melting is carried out to power transmission line overhead ground wire, including N number of segmentation tower, aerial earth wire, described N Individual segmentation tower be followed successively by segmentation tower 1, segmentation tower 2, segmentation tower 3 ..., segmentation tower N, it is characterised in that also including AC three-phase Source, DC de-icing device, the first wire, the second wire, segmentation ground wire, grounding switch KG, automatic connection device KN；Described One wire, the second wire are isolated and insulation against ground with power network, the first described wire ice-melt short circuit point on the segmentation tower of odd number, The second described wire ice-melt short circuit point is on the segmentation tower of even number, and described aerial earth wire insulation against ground and segmentation passes through multiple Grounding switch KG is grounded, and each described segmentation tower is by automatic connection device KN by the first wire or the second wire with making somebody a mere figurehead ground Minimum one section of segmentation ground wire in parallel or minimum one section of segmentation ground wire of connecting, described automatic connection dress at line short circuit, each short circuit Put KN to control to be opened and closed by signal, three-phase ac power supply is connected with DC de-icing device, the first described wire and DC ice melting The output cathode connection of device, the second described wire and the output negative pole of DC de-icing device are connected；Described DC ice melting Device and the first wire, the access point of the second wire are equipped with access disconnecting link K.

2. a kind of device that DC ice melting is carried out to power transmission line overhead ground wire according to claim 1, it is characterised in that Described three-phase ac power supply is 35kV or 10kV station electricity consumptions.

3. a kind of device that DC ice melting is carried out to power transmission line overhead ground wire according to claim 1, it is characterised in that The adjustable extent of the stable DC electric current of described DC de-icing device is 100-4500A.

4. a kind of device that DC ice melting is carried out to power transmission line overhead ground wire according to claim 1, it is characterised in that The equivalent d.c. resistance value that described segmentation ground wire or aerial earth wire are accessed between the first wire and the second wire is R, Equivalent DC The scope of resistance is that 1-90 Ω, ice melting current scope are 100-600A.

5. a kind of device that DC ice melting is carried out to power transmission line overhead ground wire according to claim 1, it is characterised in that Described grounding switch KG is the 35kV classes of insulation.

6. a kind of device that DC ice melting is carried out to power transmission line overhead ground wire according to claim 1, it is characterised in that Described automatic connection device KN possesses two kinds of switching positions, during ice-melt it is in the close position by aerial earth wire and the first wire or Second wire is connected, and is connected aerial earth wire with earth point in open position when circuit is normally run.