Summary of the invention
To solve the above problems, providing a kind of power distribution network vehicle-mounted mobile AC ice melting device, including for transporting the present apparatusTransport vehicle, further include ice-melt transformer and breaker, the ice-melt transformer is step-down transformer, ice-melt transformer end of incoming cablesIt connects to power supply, leading-out terminal is connect after breaker with icing route head end, is additionally provided with short circuit conducting wire, the short circuit conducting wireFor being shorted icing line end, closed circuit is formed with ice-melt inducer for line outlet end of transformer.
Further, isolation switch is provided between the ice-melt inducer for line outlet end of transformer and breaker.
Further, the bracket that angle steel is welded into is provided on the transport vehicle carriage, the bracket is fixed on compartmentBottom simultaneously extends to above driver's cabin, and the ice-melt transformer is arranged on bracket and is located in compartment, the breaker settingOn bracket and it is located above driver's cabin, ice-melt transformer and breaker are bolted on bracket.
A kind of power distribution network vehicle-mounted mobile exchange de-icing method, according to environment temperature, ice covering thickness, ambient wind velocity and icingD.C. resistance, forward-sequence reactance and the impedance of line conductor determine ice melting current, and carry out deicing by following steps:
A, deicing device is transported close to one end of feeder ear by icing route by transport vehicle；
B, icing route and the route of power supply bureau side are disconnected by isolating device；
C, it on power supply bureau's side route described in ice-melt transformer end of incoming cables access step b, is provided for ice-melt transformerPower supply, ice-melt inducer for line outlet end of transformer access icing route on one end of feeder ear, the ice-melt inducer for line outlet end of transformer routeIt is provided with breaker and isolation switch, by being shorted shorted on one end of the conducting wire by icing route far from feeder ear；
D, it closes breaker and isolation switch and ice-melt is carried out with ice melting current.
Further, the ice melting current includes protecting line current, best ice melting current and maximum allowed current, characterization are as follows:
I=U/ (4.3Rz+0.085Rd+1.21Rk), H=-3 DEG C, F=3m/s, L=10mm
In formula, I is to protect line current, and U is ice-melt transformer output voltage, RzFor D.C. resistance, RdFor forward-sequence reactance, RkForImpedance, H are environment temperature, and F is ambient wind velocity, and L is ice covering thickness；
Ir=1.32I, H=-3 DEG C, F=3m/s, L=10mm
IrFor best ice melting current；
Im=2.62I, H=-3 DEG C, F=3m/s, L=10mm
ImFor maximum allowed current.
Further, environment temperature is every reduces by 2 DEG C, and guarantor's line current increases 20 percent.
Further, the every increase 2m/s of ambient wind velocity, guarantor's line current reduce 3 percent.
Further, the every increase 5mm of ice covering thickness, guarantor's line current increase 1 16.
Further, best DC ice-melting length, characterization are calculated according to best ice melting current are as follows:
Z in formulaBFor best DC ice-melting length.
Further, ice-melt scheme is determined according to icing line length and best DC ice-melting length, characterized are as follows:
Work as 1.2ZB>=Z > 2/3ZB, icing route entirety ice-melt；
Work as 2.2ZB>=Z > 1.2ZB, icing route is divided into two sections of ice-melts:
Z is icing line length in formula.
The beneficial effects of the present invention are provide a kind of power distribution network vehicle-mounted mobile AC ice melting device and method, pass throughVehicle-mounted ice-melt transformer reduces power distribution network itself output voltage, is linked on icing route, and be shorted this section of route make electric wire fromBody fever carries out deicing, saves manpower, and combining environmental factor comprehensively considers the size of ice melting current, in the feelings for guaranteeing safetyThe efficiency of ice-melt is improved under condition.
Embodiment: as shown in Figure 1, a kind of power distribution network vehicle-mounted mobile AC ice melting device, including for transporting the present apparatusTransport vehicle 1, deicing device include ice-melt transformer 3 and breaker 4, and the ice-melt transformer 3 is step-down transformer, and ice-melt becomesDepressor end of incoming cables 31 connects to power supply, and ice-melt inducer for line outlet end of transformer 32 is connect after breaker 4 with 7 head end of icing route, alsoIt is provided with and is shorted conducting wire 6, the short circuit conducting wire 6 can hang one on 1 car body of transport vehicle for being shorted 7 end of icing routeA control box introduces the switch of breaker 4 in control box by conducting wire, which can avoid work by latch enclosureMake personnel misoperation.
7 head end of icing route described herein and end refer respectively to icing route 7 close to one end of feeder ear and remoteOne end from feeder ear.
Preferably, being provided with isolation switch 5 between 3 leading-out terminal of ice-melt transformer and breaker 4.
For power distribution network branch line, 10kV can be down to 400V by the ice-melt transformer 3 of the present apparatus, for entire deicingFor device, only 4 one cut-off points of breaker, it may occur however that the case where false switching, Personal Risk is brought, once false switching,The voltage of 400V can be lethal to people in the short time, and an isolation switch 5 is arranged, obvious there is also one except breaker 4Cut-off point, be able to ascend safety, but it should be noted at this point that isolation switch 5 can not hot line job, that is to say, thatFirst cut-off breaker 4 disconnects isolation switch 5 again, first closes isolation switch 5 when closing a floodgate and closes breaker 4 again, avoids generating electricityArc.
Preferably, being provided with the bracket 2 that angle steel is welded on 1 compartment of transport vehicle, the bracket 2 is fixedIt in car bottom and extends to above driver's cabin, the ice-melt transformer 3 is arranged on bracket 2 and is located in compartment, described disconnectedRoad device 4 is arranged on bracket 2 and is located above driver's cabin, and ice-melt transformer 3 and breaker 4 are bolted on bracket 2On.
Ice-melt transformer end of incoming cables 31 needs to connect power supply, and power supply herein generally uses the power supply line of distribution on the spot,The wiring from transmission line of electricity is namely needed to get off to be attached, the leading-out terminal of ice-melt transformer can connect after breaker 4It is connected to the head end of icing route 7, the connecting wire of entire deicing device at the scene is in a relationship sequentially, by 4 He of breakerTwo positions of transport vehicle 1 are arranged in ice-melt transformer, and wiring point has drop in height, can be with wiring laterally existingThe sequentially relationship that relationship matches.
A kind of power distribution network vehicle-mounted mobile exchange de-icing method, according to environment temperature, ice covering thickness, ambient wind velocity and icingD.C. resistance, forward-sequence reactance and the impedance of 7 conducting wire of route determine ice melting current, and carry out deicing by following steps:
A, deicing device is transported close to one end of feeder ear by icing route 7 by transport vehicle 1；
B, icing route 7 and the route 8 of power supply bureau side are disconnected by isolating device；
C, ice-melt transformer end of incoming cables 31 is accessed on power supply bureau's side route described in step b, is mentioned for ice-melt transformerPower supply source, ice-melt inducer for line outlet end of transformer 32 access icing route 7 close to one end of feeder ear, the ice-melt inducer for line outlet end of transformer 32Breaker 4 and isolation switch 5 are provided on route, by being shorted shorted on one end of the conducting wire 6 by icing route 7 far from feeder ear；
D, it closes breaker 4 and isolation switch 5 carries out ice-melt.
Preferably, the ice melting current includes protecting line current, best ice melting current and maximum allowed current, characterizationAre as follows:
I=U/ (4.3Rz+0.085Rd+1.21Rk), H=-3 DEG C, F=3m/s, L=10mm formula (1)
In formula, I is to protect line current, and U is ice-melt transformer output voltage, RzFor D.C. resistance, RdFor forward-sequence reactance, RkForImpedance, H are environment temperature, and F is ambient wind velocity, and L is ice covering thickness；
Ir=1.32I, H=-3 DEG C, F=3m/s, L=10mm formula (2)
IrFor best ice melting current；
Im=2.62I, H=-3 DEG C, F=3m/s, L=10mm formula (3)
ImFor maximum allowed current.
Ice-melt for distribution network transmission line should not be limited to the theoretical foundation in laboratory, diverse geographic locationSituations such as route, surrounding meteorological and temperature, can all influence actual deicing processes, protect line current and refer to currentUnder ambient conditions, which can guarantee that transmission line icing is not further added by, that is, reach a dynamic equilibrium, and maximum allowable electricityStream is then the maximum current being able to bear under the premise of not damaging conducting wire when this section of icing route 7 is shorted, and is a limiting value, thatBest ice melting current is then the preferred value that can eliminate transmission line icing, it is known that being shorted route will lead to lineRoad fever, best ice melting current are to guarantee the balance of line security and ice-melt between the two, ice-melt and can be damagedHurt conducting wire.
Preferably, on the basis of formula (1), making described determining that environment temperature is every to reduce by 2 DEG C when protecting line currentIt protects line current and increases 20 percent.
Preferably, determining that the every increase 2m/s of ambient wind velocity makes institute on the basis of formula (1) when protecting line currentIt states and protects line current reduction 3 percent.
Preferably, determining that the every increase 5mm of ice covering thickness makes described on the basis of formula (1) when protecting line currentIt protects line current and increases 1 16.
Environment temperature, wind speed and current transmission line icing thickness are comprehensively considered, as outdoor ambient conditions, variationA possibility that it is larger, the present invention determines the size for protecting line current for such variation, allows the invention to be suitable for eachKind ambient conditions.
Preferably, calculating best DC ice-melting length, characterization according to best ice melting current are as follows:
Z in formulaBFor best DC ice-melting length.
Preferably, determining ice-melt scheme according to 7 length of icing route and best DC ice-melting length, characterize are as follows:
Work as 1.2ZB>=Z > 2/3ZB, the whole ice-melt of icing route 7:
Icing route 7 is divided into two sections of ice-melts:
Work as 2.2ZB>=Z > 1.2ZB, icing route 7 is divided into two sections of ice-melts:
Z is 7 length of icing route in formula.
Best ice-melt length is determined according to best ice melting current, and from the point of view of ice-melt effect, ice melting current is mostFluctuation in 20% range of good ice melting current or so, difference on effect is little, and best ice-melt length can also be according to this effectRelationship does certain adjustment, it is intended that such as have one section of icing route 7 length be 1.2km, and it is calculated mostGood ice-melt length is 1km, is that the route of this 1.2km can be carried out to whole ice-melt, section under the premise of guaranteeing ice-melt effectThe cost for once disconnecting route is saved, the duration of He Yici ice-melt carries out ice-melt, increased time compared to the route only to 1kmTime cost is greatly saved for segmentation ice-melt twice in 30~60min in cost.Similarly, we are to icing line7 length of road is more than the route just segmented ice-melt of 1.2 times of best ice-melt length, for example one section of icing route 7 is 1.5km long, mostGood ice-melt length is 1km, segmented de-icing method provided by the invention be this section of route is divided into the route of every section of 7.5km intoRow ice-melt, rather than according to the 1km and 0.5km of best ice-melt length, ice-melt equal length twice, then the shadow of equipment various aspectsRing factor be it is identical, be convenient for staff's control ice-melt effect, for equipment also do not need carry out adaptability adjustment,Cost is actually saved.
In the description of the embodiment of the present invention, it is to be understood that term " on ", "lower", "front", "rear", " left side "," right side ", " hard straight ", "horizontal", "center", "top", "bottom", " top ", " root ", "inner", "outside", " periphery ", " inboard ", " interiorThe orientation or positional relationship of the instructions such as side ", " outside " is to be based on the orientation or positional relationship shown in the drawings, merely to making in retouchingIt states the present invention and simplifies description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specificOrientation construction and operation, therefore be not considered as limiting the invention.Wherein, the area that " inboard " refers to inside or fence upDomain or space." periphery " refers to the region around certain particular elements or specific region.
In the description of the embodiment of the present invention, term " first ", " second ", " third ", " the 4th " are only used for description mesh, it is not understood to indicate or imply relative importance or implicitly indicates the quantity of indicated technical characteristic.It limits as a result,There are the feature of " first ", " second ", " third ", " the 4th " to can explicitly or implicitly include one or more spy surelySign.In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or more.
In the description of the embodiment of the present invention, it should be noted that unless otherwise clearly defined and limited, term" installation ", " connected ", " connection ", " assembling " shall be understood in a broad sense, for example, it may be being fixedly connected, be also possible to detachably connectIt connects, or is integrally connected；It can be directly connected, can also can be inside two elements indirectly connected through an intermediaryConnection.For the ordinary skill in the art, above-mentioned term in the present invention specific can be understood with concrete conditionMeaning.
In the description of the embodiment of the present invention, particular features, structures, materials, or characteristics can at any one orIt can be combined in any suitable manner in multiple embodiment or examples.
In the description of the embodiment of the present invention, it is to be understood that "-" and "~" indicated is that two values are sameRange, and the range includes endpoint.Such as: " A-B " indicates to be greater than or equal to A, and is less than or equal to the range of B." A~B "It indicates to be greater than or equal to A, and is less than or equal to the range of B.
In the description of the embodiment of the present invention, the terms "and/or", only it is a kind of describe affiliated partner passConnection relationship indicates may exist three kinds of relationships, for example, A and/or B, can indicate: individualism A exists simultaneously A and B, individuallyThere are these three situations of B.In addition, character "/" herein, typicallys represent the relationship that forward-backward correlation object is a kind of "or".
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be withMultiple variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understandingAnd modification, the scope of the present invention is defined by the appended.