CN205509495U - Acquire device that exchanges power frequency power supply in exchanging high tension transmission line - Google Patents

Abstract

The utility model relates to an acquire device that exchanges power frequency power supply in exchanging high tension transmission line. The purpose will exchange high -tension electricity among the high tension transmission line through the device can draw and connect to ground and convert the power -frequency alternating voltage that ordinary electronic equipment can use into to satisfy open -air electronic equipment's power consumption demand, have popularization with low costs, easy, long service life, advantage that job stabilization is reliable simultaneously. The utility model provides a: during the device is applied to three -phase AC transmission line, connect out the capacitor bank spare of a serial -type on every looks power transmission line, three capacitor bank spare connects into three -phase evenly distributed's Y shape structure, and the public end at three -phase capacitor bank spare presents the fictitious zero current potential like this, between one of them the mutually terminal condenser of three -phase capacitor subassembly and the fictitious zero current potential in proper order the electricity even get electrical transformer and a plurality of isolation transformer. The utility model is suitable for a provide the low voltage power supply in the field for electronic equipment such as the control on the high tension power line, illuminations.

Description

The device of AC power frequency supply is obtained in AC high-voltage electric transmission line

Technical field

This utility model relates to a kind of device obtaining AC power frequency supply in AC high-voltage electric transmission line.It is applicable to The electronic equipments such as field is the monitoring on high voltage transmission line, illumination provide low-tension supply.

Background technology

Often need on ultra-high-tension power transmission line to install some for the auxiliary equipment monitoring, detecting line conditions, these equipment Need to use～the power frequency supply of 220V voltage, then step-down rectifier is to ± the voltage such as 5V, ± 12V, ± 24V, ± 36V, although this A little electricity consumption of equipment amounts are little, but to obtain stable working power in the wild and be not easy very much.

At present, the auxiliary equipment on ultra-high-tension power transmission line typically has following several way to take power:

1, use solar panel, but solar panel is after continuously work a period of time, it is necessary to safeguard or more Changing, this will have a power failure on important transmission line of electricity, and institute is the most unreliable；

2, carry out laser powered sensor by optical fiber, exist for the shortcoming that electricity is little, and due to generating laser, optical fiber, photoelectricity Transducer is the most aging, easily affects power supply quality, and cost is high, is difficult to promote；

3, the electric current utilizing high voltage transmission line carries out sensing power taking, i.e. utilizes current transformer to feel from high voltage transmission line Answer power taking.But owing to current transformer primary side current changes the most greatly, from several amperes to kilo-ampere, therefore, in application When current transformer realizes power supply, if load current is at below 50A, device then cannot get electric energy.Additionally, current transformer takes How the voltage arrived, still in high potential, directs it out that to use on ground be also a problem that must solve, such as: notification number All the sensing electricity getting device for aerial high voltage power line for CN101783532B, CN200410061314.9 etc., above-mentioned specially The equipment that profit technology can only be suitable on the current potential (i.e. high potential) identical with wire uses, and cannot draw and be connected to ground as exchange The safety power supply of 220V, and some monitoring devices, as video camera, radio communication terminal are often arranged on steel tower, i.e. need Will trouble free service power supply equipotential with ground, such as alternating current 220V or 110V, therefore prior art is difficult to meet these equipment Power reguirements.

Summary of the invention

The technical problems to be solved in the utility model is: provides a kind of and obtains AC power frequency in AC high-voltage electric transmission line The device of power supply, its objective is to be drawn by the high voltage electric energy in AC high-voltage electric transmission line by this device be connected to ground and be converted to The power frequency ac voltage that usual device can use, to meet the need for electricity of field electronic equipment, meanwhile, this device is also Should have low cost, easily popularization, length in service life, advantage stable and reliable in work.

This utility model be the technical scheme is that the dress obtaining AC power frequency supply in AC high-voltage electric transmission line Put, it is characterised in that this device is applied in three phase current feeder road, every phase power transmission line picks out an in-line electricity Container assemblies, three capacitor assemblies connect into the equally distributed Y-shaped structure of three-phase, so public at three-phase capacitor assembly End presents fictitious zero current potential；Described three-phase capacitor assembly wherein between a phase end capacitor and fictitious zero current potential successively Be electrically connected power taking transformator and several isolating transformers.

Described power taking transformator includes armature winding and the secondary windings of power taking transformator of power taking transformator, wherein power taking The armature winding of transformator is parallel between described end capacitor and fictitious zero current potential after connecting with damped resistor；Described take The secondary windings of piezoelectric transformer connects with the armature winding Same Name of Ends of the isolating transformer of next stage.Described isolating transformer time Level winding connects with first group of Motor Winding Same Name of Ends of next stage isolating transformer.

Described end capacitor is the capacitor of one or several series connection near fictitious zero current potential.

The transformation ratio of described power taking transformator is the armature winding number of turn: secondary winding turns=10500～20000V: 220V。

Described damped resistor is powerful carborundum resistor or cement resistor, the resistance of damped resistor Matching with condenser capacity and power taking transformer capacity, Standard resistance range is between 500 Ω～5000 Ω.

Described isolating transformer is the transformator of equal transformation ratio, its armature winding and the resistance to pressure request of insulation of secondary windings More than 50～100kV.

Concatenating fuse and load on the secondary windings of least significant end isolating transformer, the end of this secondary windings connects with the earth Connect.

Described capacitor assembly is installed in the insulating vessel of sealing.Power taking transformator and isolating transformer are respectively by absolutely Edge cross-arm support is fixed on the steel tower of transmission line of electricity.

The beneficial effects of the utility model are: this utility model utilizes coordinating of Capacitor banks and transformator, solves peace Be contained in outdoor field, the electronic equipment of barren hill be difficult to obtain 220V or 110V working power a difficult problem；This utility model takes Material in conventional components and parts, low cost, is easily implemented, can large scale application；Than currently used power taking this device of equipment Service life is longer, stable and reliable in work, need not frequent repair and maintenance.

Accompanying drawing explanation

Fig. 1 is circuit structure schematic diagram of the present utility model.

Fig. 2 is the schematic diagram of capacitor assembly insulating vessel in this utility model.

Detailed description of the invention

As shown in Figure 1 and Figure 2, this device is applied in three-phase (A phase, B phase, C phase) transmission line of alternation current, the voltage of this example Grade is Ue=220kV, picks out an in-line capacitor assembly on every phase power transmission line, and three capacitor assemblies are (respectively It is A phase capacitor assembly Ca, B phase capacitor assembly Cb, C phase capacitor assembly Cc) connect into three-phase equally distributed Y shape (star Shape) structure, the public end (0 point) of three-phase capacitor assembly presents fictitious zero current potential.Described three-phase capacitor assembly is wherein End capacitor (this example power taking container Ca-n and capacitor Ca-n-connected in series of one phase (this example is A phase)₁) and fictitious zero Be electrically connected between current potential power taking transformator ZB and 2 isolating transformer (GB successively₁And GB₂)。

Described power taking transformator ZB includes the armature winding N of power taking transformator₁Secondary windings N with power taking transformator₂, its The armature winding N of middle power taking transformator₁Described end capacitor (M point) and fictitious zero it is parallel to damped resistor R after connecting Between current potential (0 point).The secondary windings N of described power taking transformator ZB₂With the first isolating transformer GB₁Armature winding n₁Of the same name End connects, the first isolating transformer GB₁Secondary windings n₂With the second isolating transformer GB₂First group of winding n₁Same Name of Ends connects, Second isolating transformer GB₂Secondary windings n₂Two ends (ac output end) connect fuse RD and load FH, this secondary windings of series connection End with the earth be connected.

The transformation ratio of this example power taking transformator ZB is armature winding N₁The number of turn: secondary windings N₂The number of turn=10500～ 20000V:220V.First isolating transformer GB₁With the second isolating transformer GB₂Be the transformator of isallobaric ratio, i.e. just group around Group n₁Equal to secondary windings n₂, primary side voltage is equal to secondary side voltage, is i.e. alternating current 220V: 220V, and armature winding is with secondary The resistance to pressure request of insulation of level winding is more than 50～100kV.

Described three capacitor assemblies are mounted in the insulating vessel of ceramic body or the silicone rubber sealed, as in figure 2 it is shown, Insulating vessel has outer diameter D and interior d, placed inside capacitor, and there are installing plate and clamp nut M in two ends.

Described power taking transformator ZB and each isolating transformer bear gradient by insulator crossarm support by voltage respectively and divide Level is fixed on steel tower, and the secondary windings end of the isolating transformer of final stage allows to be connected with the grounding body G end of steel tower.

The operation principle of the present embodiment is as follows:

By three capacitor assembly C_a、C_b、C_cAfter connecting by Fig. 1, the three-phase being connected to AC high-voltage electric transmission line is led On line A, B, C, when selecting the capacitive reactance of capacitor, pass through formulaIf the electric pressure of transmission line of electricity is Ue= 220kV, according to Ohm's law, flows through the electric current of capacitor assembly If taking suitable appearance The capacitor of amount just can reach the current value of design.According to load condition, generally select the operating current on capacitor be 50～ Between 200mA, A phase end capacitor Ca-n in this electric current flows through such as Fig. 1 and capacitor Ca-n-₁Time, it will inducing The voltage U that design is taken₁, it is commonly designed at about 10kV～20kV, and by capacitor assembly C_a、C_b、C_cThree-phase star even Connect, the fictitious zero current potential O point of an artificial manufacture can be formed, its objective is when properly functioning, sampling voltage U_MValue is relatively Current potential in the earth G will be greatly reduced, and the most also only have the magnitude of voltage of 10kV～25kV, and the advantage being so designed that is can to make to take Piezoelectric transformer ZB usually can in, work under low-pressure state, the most just can reduce the insulating requirements to power taking equipment, with this come Reduce equipment cost.According to transformer principle, after the primary side of power taking transformator ZB obtains voltage from end capacitor, secondary Side will export the magnitude of voltage of 220V (or 380V), then (can determine what uses by design by multi-stage isolation transformator Isolating transformer), above-mentioned magnitude of voltage is carried out force transfer, finally gives the power frequency work safety power supply of needs.

The purpose using multi-stage isolation transformator also resides in, if there is ground short circuit in transmission line of electricity, as short-circuit in B phase, Then the current potential on wire can present the high-voltage value of line voltage, i.e. 220kV relative to the earth G, at this moment by power taking transformator ZB The design system being connected in series with multiple isolating transformers just can bear the level of high voltage withstanding 220kV.The present invention will isolate Insulating capacity between armature winding and the secondary windings of transformator is improved, and usually requires that the input of an isolating transformer Side reaches 50～100kV with the insulation tolerance of outlet side.In view of the requirement of outdoor insulative, it is generally insulated transformator requirement With insulating capacity and weatherability strong epoxy resin cast electromagnetic potential transformer design structure as isolation transformation Device.

In Fig. 1, damped resistor R is the armature winding N for preventing power taking transformator ZB₁L-C is occurred to connect humorous with capacitor The damping resistance vibrated and arrange.Material is carborundum or cement resistor, and resistance is by capacitance and inductive capacity Join, generally select 500 Ω～5000 Ω.

The design power of this device is 100～about 200W, if output to be increased, as long as would increasing the appearance of capacitor Value, if end capacitor (Ca-n and Ca-n-set₁) monomer capacity is less, then the capacitive reactance presentedRelatively Greatly, from U=IR, if sampling voltage is located at U₁≈ 10～12kV, the no-load voltage ratio of power taking transformator ZB is set as N₁: N₂= 12kV:220V, will induce the magnitude of voltage of 220V in the secondary side winding of ZB, this voltage through several levels isolating transformer GB every After dielectric transmission, just can obtain the conventional power supply of AC power frequency 220V on the ground, the working power as field uses.

Detailed description of the invention

1, after outdoor capacitor assembly series wiring, it is connected to wire A phase, B phase, C phase, then by capacitor The afterbody of assembly carries out star (Y) wiring, manufactures the current potential of a virtual zero point artificially, at the end capacitor i.e. M point of A phase Draw a lug.

(1) selection of capacitor calculates, if setting voltage grade is 110kV, the running voltage of capacitor is 100mA, i.e. 0.1A, according toSelect condenser capacity and model: Xc (capacitor value)(power frequency f=50Hz)

Capacitance $C=\frac{1}{2\mathrm{\π}\·fXc}=\frac{1}{314.15\×1100000}=2893.8pF$ (picofarad)

Being designed as pressure voltage 2 (safety coefficient) × 110kV=220kV, power taking capacity is the capacitor of 2895pF, looks into product After data, select Xi'an Guo Da electronics scientific technology co CB81 type high pressure polystyrene film capacitor, rated voltage 30kV/ 5000pF, after being connected with 18 by the capacitor of this model, capacitance is 5000pF/18=277.8, takes 278pF (micro- Method), then in the way of carrying out parallel connection by 11 groups, after being 18 × 11=198 capacitor string mode, total capacitance C can be obtained The value of=278 × 11=3055pF, i.e. can obtain the current value of 104mA in capacitor loops.

(2) determination of end capacitor, sets M point current potential as 12kV, U=I R, 12000V=0.1A Xc Ω, Xc= 120000 Ω=120k Ω, $Xc=\frac{1}{fc2\mathrm{\π}},C=\frac{1}{314\×120000}=26539pF$ (picofarad)

The capacity selecting end capacitor C is 26539pF (picofarad), uses two, the capacitor series connection of pressure GB-8/30kV/5000pF, 11 parallel connections are attached, and total capacitance value is 27500pF, $Xc=\frac{1}{314Xc}=\frac{1}{314\×27500}=115807\mathrm{\Ω},$

U₁=115807 Ω × 0.1A=11.58kV.

2, power taking transformator ZB design, armature winding N₁Design 11.5kV, two grades of winding N₂Design voltage～220V, design Core section amasss as 3400mm²(iron core cylinder radius 33mm) selects design of transformer capacity to be the transformator of 600W, primary side Electric current(electric current), transformer: secondary coil all resistance to copper core enamel-covered wire coiling Insulating capacity requires as 100kV.Power taking transformator ZB manufacturer is: District, Xinyang Area, Henan Province transformer company limited.

3, isolating transformer GB design, armature winding n₁With secondary windings n₂The number of turn is the same, is～220V :～220V, hold Amount is designed as 500W, and electric current isRequire that the insulating capacity just organized between winding and secondary windings is 60kV～100kV, can use the outdoor insulative transformator that dry type epoxy resin is poured into a mould, and manufacturer is: Qianjiang, Hangzhou transformator Company limited.

If increasing the electric current I flowing through capacitor assembly_A、I_B、I_C, or increase U_MThe magnitude of voltage of point, can be by power taking power It is promoted to 500～about 5000W, to meet the big power load requirement carrying out monitoring in transmission line of electricity.

Claims (10)

1. the device obtaining AC power frequency supply in AC high-voltage electric transmission line, it is characterised in that: this device is applied to In three phase current feeder road, picking out an in-line capacitor assembly on every phase power transmission line, three capacitor assemblies are even It is connected into the equally distributed Y-shaped structure of three-phase, the so public end at three-phase capacitor assembly and presents fictitious zero current potential；Described three Phase capacitor assembly be wherein electrically connected successively between a phase end capacitor and fictitious zero current potential power taking transformator and several every From transformator.

The device obtaining AC power frequency supply in AC high-voltage electric transmission line the most according to claim 1, its feature exists In: described power taking transformator includes armature winding and the secondary windings of power taking transformator, the wherein power taking transformation of power taking transformator The armature winding of device is parallel between described end capacitor and fictitious zero current potential after connecting with damped resistor；Described power taking becomes The secondary windings of depressor connects with the armature winding Same Name of Ends of the isolating transformer of next stage.

The device obtaining AC power frequency supply in AC high-voltage electric transmission line the most according to claim 2, its feature exists In: the secondary windings of described isolating transformer connects with first group of Motor Winding Same Name of Ends of next stage isolating transformer.

The device obtaining AC power frequency supply in AC high-voltage electric transmission line the most according to claim 3, its feature exists In: described end capacitor is the capacitor of one or several series connection near fictitious zero current potential.

The device obtaining AC power frequency supply in AC high-voltage electric transmission line the most according to claim 4, its feature exists In: the transformation ratio of described power taking transformator is the armature winding number of turn: secondary winding turns=10500～20000V:220V.

The device obtaining AC power frequency supply in AC high-voltage electric transmission line the most according to claim 3, its feature exists In: described damped resistor is powerful carborundum resistor or cement resistor, the resistance of damped resistor and electricity Container capacity and power taking transformer capacity match, and Standard resistance range is between 500 Ω～5000 Ω.

The device obtaining AC power frequency supply in AC high-voltage electric transmission line the most according to claim 4, its feature exists In: described isolating transformer is the transformator of equal transformation ratio, and resistance to pressure request is more than its armature winding with the insulation of secondary windings 50～100kV.

The device obtaining AC power frequency supply in AC high-voltage electric transmission line the most according to claim 4, its feature exists In: concatenating fuse and load on the secondary windings of least significant end isolating transformer, the end of this secondary windings is connected with the earth.

The device obtaining AC power frequency supply in AC high-voltage electric transmission line the most according to claim 8, its feature exists In: described capacitor assembly is installed in the insulating vessel of sealing.

The device obtaining AC power frequency supply in AC high-voltage electric transmission line the most according to claim 9, its feature exists In: described power taking transformator and isolating transformer are fixed on the steel tower of transmission line of electricity by insulator crossarm support respectively.