CN202513531U - Direct current ice-melting device for 10-kilovolt rural power grid distribution lines - Google Patents
Direct current ice-melting device for 10-kilovolt rural power grid distribution lines Download PDFInfo
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- CN202513531U CN202513531U CN2012201367438U CN201220136743U CN202513531U CN 202513531 U CN202513531 U CN 202513531U CN 2012201367438 U CN2012201367438 U CN 2012201367438U CN 201220136743 U CN201220136743 U CN 201220136743U CN 202513531 U CN202513531 U CN 202513531U
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Abstract
The utility model provides a direct current ice-melting device for 10-kilovolt rural power grid distribution lines. The direct current ice-melting device for 10-kilovolt rural power grid distribution lines is composed of a plurality of movable 380-volt alternating current power sources and a direct current constant current heating power source which comprises a plurality of uniform main loops and a control unit, wherein an alternating current rectifying unit (1), a filtering unit (2), a field-effect tube high-frequency inversion unit (3), a high-frequency transformer depressurization unit (4), a schottky diode rectifying filtering unit (5) and a direct current output unit (6) are connected in sequence to constitute each main loop. The control unit is composed of a pulse width modulation (PWM) control circuit which is controlled by a personnel computer (PC) management system, a detection protective circuit (9), a set-value setting and operating component (8) and a display circuit (10). The alternating current rectifying unit (1) of each main loop is independently connected with one movable 380-volt alternating current power source, and direct current output units (6) of the plurality of the main loops are connected with each other in parallel to form direct current output ends. The direct current ice-melting device for 10-kilovolt rural power grid distribution lines can achieve direct current ice-melting processes of 10-kilovolt rural power grid distribution lines which are coated with ice.
Description
Technical field
The utility model belongs to the electric power project engineering field; Relate to a kind of 10KV rural power grids distribution line DC de-icing device; Be applicable to that the 10kV rural power grids distribution line behind the icing is carried out DC ice melting to be handled, tower, the accidents such as bar, broken string, short circuit of falling take place to prevent the personal distribution line icing of rural power grids distribution line and industrial and mining enterprises.
Background technology
The powerline ice-covering that low temperature sleet freezing weather causes is one of serious threat of being faced of system of numerous State Grid, and serious icing can cause the electrical network broken string, fall tower, causes large area blackout.North America ice storm in 1998 has powered up guipure to U.S.A and has had a strong impact on, and has caused the power breakdown of wide.2008, area, Chenzhou freezing weather of southern china also caused transmission line large tracts of land, the long-time stoppage in transit, causes this area's resident living difficulty, causes heavy economic losses to society.Thereby, form at transmission line and in time it to be carried out ice-melt in the icing and handle, peel off or eliminate icing, prevent that circuit from falling tower and broken string, guarantees that the safe operation of transmission line is very necessary.
After the ice damages in 2008, caused the China Power technical field to the anti-ice of electrical network, anti-icing, ice-melt, the self-examination that keeps away ice, and counterweight point circuit is implemented to strengthen anti-ice design and is transformed, the raising anti-disaster ability.In order to overcome since the existing line icing to threat that safe operation of power system caused; At present; The deicer that is adopted adopts the deicing device of ac short circuit method design often, and this device need apply circuit series connection coupling, load transfer and a large amount of on-the-spot grid switching operations, and is very complicated; Operating difficulties is not easy on electrical network comprehensively and effective application.In recent years, having occurred adopting direct current method that transmission line is carried out ice-melt handles.
Wherein, On April 29th, 2009, Chinese utility model patent document CN201230188Y disclosed a kind of movable DC deicing device that is used for transmission line; Comprise automobile and be arranged on the controllable direct current power supply on the automobile; The output of controllable direct current power supply is connected on two phase lines of the transmission line of treating ice-melt, the other end short circuit of phase line.This device adopts the controllable direct current power supply of 20 feet vehicle-mounted container sizes that transmission line is carried out ice-melt, and obviously it is very heavy, the very high and hard transportation of cost, and the personal distribution line of rural power grids distribution line and mountain area industrial and mining enterprises can't use at all.
In addition, on May 6th, 2009, Chinese utility model patent document CN201234104Y disclosed a kind of mobile power line DC ice-melting device, and it comprises that series impedance and the uncontrollable rectifier of three-phase bridge are composed in series; When powerline ice-covering; This device inserts electrical network by series impedance, converts three-phase alternating-current supply to direct current and is added on the transmission line, utilizes lead energising back heating that icing is melted; But the rectifier of this device is uncontrollable; Can't avoid flow problem, and deicing device voltage is relatively low, the ice-melt effect is comparatively undesirable.
In addition; On February 1st, 2012, Chinese utility model patent document CN 202134875 U also disclosed a kind of portable series direct current deicing device; It comprises power transformer, adopt single-phase silicon-controlled between the positive terminal of rectifier, the cathode output end that is connected on the three-phase bridge rectification module and rectifier of three-phase bridge rectification module; Though this patented technology can be suitable for mountain road; Small-sized flexibly but the harmonic wave that produces during its operation has following influence: the one, harmonic wave distorts power-supply system voltage and current waveform, causes that generator and controller switching equipment are overheated, loss increase, system's overvoltage; The 2nd, harmonic wave increases power system reactive power power, and power factor descends, effective utilization of restriction power supply capacity; The 3rd, humorous wave energy makes semiconductor device itself produce false triggering, loses out-of-control phenomenon such as pulse.
The utility model content
The technical problem that the utility model will solve is to solve existing deicing situation backward in technique, manufactures and designs a kind of 10KV rural power grids distribution line DC de-icing device.This device volume is little, and is in light weight, is convenient to mountain road and moves, and it is good to suppress harmonic wave during operation.Utilize this device; The personal distribution line of 10kV rural power grids distribution line behind the icing and mountain area industrial and mining enterprises is carried out DC ice melting to be handled; To eliminate the accident potential in the artificial ice detachment, prevent tower, the large-area power-cuts that accident caused such as bar, broken string, short circuit to take place because of the distribution line icing.
The utility model adopts following technical scheme to be achieved: a kind of 10KV rural power grids distribution line DC de-icing device, form by many portable 380V AC powers and direct current constant current heating power supply two parts; The dc output end of direct current constant current heating power supply is connected on two phase endpoints treating ice-thawing electric transmission line with cable; Said direct current constant current heating power supply includes a plurality of identical and major loop and control units that be linked in sequence and constituted by AC rectification unit, filter unit, FET high-frequency inversion unit, high frequency transformer pressure unit, Schottky diode rectification filtering unit and direct current output unit; Said control unit is made up of pwm control circuit, detection protective circuit, set-point setting operation parts and the display circuit of computer management system control; Pwm control circuit through multi-channel driver circuit respectively with above-mentioned each major loop in FET high-frequency inversion unit be connected; Pwm control circuit also is connected with set-point setting operation parts; Described detection protective circuit has multichannel sampled signal input and two paths of signals output, the corresponding direct current output unit that connects in one of above-mentioned a plurality of major loops of every road sampled signal input; The two paths of signals output that detects protective circuit connects pwm control circuit and display circuit respectively; Portable 380V AC power of the AC rectification unit separate connection of said each major loop; Direct current output unit in the said a plurality of major loop composition dc output end that is in parallel each other.
Above-mentioned two phase endpoints treating ice-thawing electric transmission line are meant the three-phase line reconfiguration of treating ice-melt are become wherein two two-end-points that are in series, or two be in parallel again with the third phase tandem compound after two-end-point.
The DC ice melting current of the required output of the utility model should allow to choose between the ampacity at line ice-melting critical current and circuit; When utilizing lead to circulate big electric current, the caloric value that the lead D.C. resistance produces will realize that the 10kV rural power grids distribution line behind the icing is carried out DC ice melting to be handled attached to the ice dissolution on the lead.
The operation principle of the utility model is: many 380V alternating currents that portable 380V AC power is produced, through the rectification of AC rectification unit, filtering, high voltage direct current; High voltage direct current adds to the inverter circuit that FET is formed; High voltage direct current converts the adjustable high frequency of pulsewidth to, and (15～20KHz) alternating currents are again through being that high frequency transformer step-down, the Schottky diode rectification of iron core converts the DC ice melting current that is applicable to the ice-melt work requirements to the amorphous soft magnetic material; The control signal of control unit output can be made rapid response to major loop output; Thereby not only provide good dynamic and static output characteristic; And can the fluctuation of various input voltages be compensated, and can make protection response rapidly to the fault that a variety of causes causes.When powerline ice-covering, the dc output end of the utility model is connected on two phase endpoints treating ice-thawing electric transmission line through cable.When utilizing lead to circulate big electric current, the caloric value that the lead D.C. resistance produces will realize that the 10kV rural power grids distribution line behind the icing is carried out DC ice melting to be handled attached to the ice dissolution on the lead.
The direct current constant current heating power supply of the utility model can be adjustable continuously in rated current, rated voltage or rated power scope.The input current set-point, power supply will move with given current value continuously.If given maximum output total current surpasses rated current, then maximum output total current can volitional check operation continuously under output-current rating.
Compare with prior art, the beneficial effect of the utility model is:
1. the utility model adopts DC ice melting, does not receive the influence of line impedance perceptual weight, does not absorb the reactive power of electrical network, and the required quantity of electricity of ice-melt reduces greatly, and ice-melt efficient is high, has practiced thrift the energy, makes the cost of ice-melt greatly reduce;
2. the utility model will treat that the three-phase line reconfiguration of ice-melt becomes two to be in series or two simple forms that are in parallel and connect with third phase, but reach 10kV rural power grids distribution line normal power supply radius through the length of calculating the maximum DC ice-melting.As select heavy icing area on the line and carry out the short circuit processing, but the length of maximum DC ice-melting also can increase.Therefore, this DC de-icing device can satisfy various model specifications, the 10kV rural power grids distribution line ice-melt design-calculated requirement of different length, applied range;
3. the direct current constant current heating power supply output current of the utility model is big, can allow to choose between the ampacity best ice melting current value enforcement ice-melt at line ice-melting critical current under different wind speed and the temperature and circuit.Therefore, this DC de-icing device can guarantee that circuit avoids big electrical injuries, can guarantee that again the ice-melt time is the shortest;
4. the direct current constant current heating power supply of the utility model adopts the synchronous parallelly connected way of output operation of multimachine.When wherein one go wrong, be attached thereto the major loop that connects and under pwm control circuit effect, deactivate automatically by computer management system control; Ice-melt power-supply system endure.When the DC heating electric current of ice-melt computation requirement is little, then can withdraw from the portable 380V AC power of part.Therefore, system reliability is high;
5. the portable 380V AC power of the utility model, direct current constant current heating power supply are all adorned onboard, can find the 10kV of system power supply point easily, find easily and insert the optimum position of treating DC ice-melting.Simultaneously, the direct current constant current heating power supply volume-diminished of the utility model, weight saving are convenient to during powerline ice-covering the outlying district, and the relatively poor area of road conditions is carried out mobile operating, launched service.Therefore, this DC de-icing device can satisfy the rapid-action demand, reduces the risk of bar, broken string.Be specially adapted to the personal distribution line of 10kV rural power grids distribution line and mountain area industrial and mining enterprises and carry out the DC ice melting processing;
6. the utility model has been removed troublesome operation such as the required circuit serial connection of conventional AC ice-melting mode and load transfer from, thereby greatly reduces issuable thus security risk.
Description of drawings
Fig. 1 is the structural representation of the utility model.
In the accompanying drawing: 1 AC rectification unit; 2 filter units; 3 FET high-frequency inversion unit; 4 high frequency transformer pressure units; 5 Schottky diode rectification filtering units; 6 direct current output units; 7 multi-channel driver circuits; 8 set-point setting operation parts; 9 detect protective circuit; 10 display circuits; The PC computer management system; The PWM pwm control circuit.
Embodiment
For clearer statement the utility model type, the utility model is done further to describe below in conjunction with accompanying drawing.
A kind of 10KV rural power grids distribution line DC de-icing device is made up of many portable 380V AC powers and direct current constant current heating power supply two parts; The dc output end of direct current constant current heating power supply is connected on two phase endpoints treating ice-thawing electric transmission line with cable; Said direct current constant current heating power supply includes a plurality of identical and major loop and control units that be linked in sequence and constituted by AC rectification unit 1, filter unit 2, FET high-frequency inversion unit 3, high frequency transformer pressure unit 4, Schottky diode rectification filtering unit 5 and direct current output unit 6; Said control unit is made up of pwm control circuit PWM, detection protective circuit 9, set-point setting operation parts 8 and the display circuit 10 of computer management system PC control; Pwm control circuit PWM through multi-channel driver circuit 7 respectively with above-mentioned each major loop in FET high-frequency inversion unit 3 be connected; Pwm control circuit PWM also is connected with set-point setting operation parts 8; Described detection protective circuit 9 has multichannel sampled signal input and two paths of signals output, the corresponding direct current output unit 6 that connects in one of above-mentioned a plurality of major loops of every road sampled signal input; The two paths of signals output that detects protective circuit 9 connects pwm control circuit PWM and display circuit 10 respectively; Portable 380V AC power of AC rectification unit 1 separate connection of said each major loop; Direct current output unit 6 in the said a plurality of major loop composition dc output end that is in parallel each other.Described two phase endpoints treating ice-thawing electric transmission line are meant the three-phase line reconfiguration of treating ice-melt are become wherein two two-end-points that are in series, or two be in parallel again with the third phase tandem compound after two-end-point.In the said high frequency transformer pressure unit 4 high frequency transformer is arranged, the iron core that high frequency transformer adopted is an amorphous soft magnetic material.FET high-frequency inversion unit 3 in 7 pairs of all major loops of said multi-channel driver circuit provides synchronizing signal mutually, makes the direct current output unit 6 parallel connection output synchronously DC ice melting current in each major loop.
The important technological parameters of this execution mode:
Input power: 400KW generator/car, or 500KVA transformer/car;
Input voltage: AC380V ± 10%;
Input supply frequency: 50Hz;
Output-current rating: DC650A;
Rated output voltage: DC600V;
Efficient: >=94%;
Voltage-regulation scope: 0～600V;
Current Regulation scope: 0～650A;
Reverse frequency: 15～20KHz;
The type of cooling: air-cooled;
The class of insulation: B level;
The utmost point: IP21 such as protection.
Claims (2)
1. a 10kV rural power grids distribution line DC de-icing device is made up of many portable 380V AC powers and direct current constant current heating power supply two parts; The dc output end of direct current constant current heating power supply is connected on two phase endpoints treating ice-thawing electric transmission line with cable; It is characterized in that: said direct current constant current heating power supply includes a plurality of identical and major loop and control units that be linked in sequence and constituted by AC rectification unit (1), filter unit (2), FET high-frequency inversion unit (3), high frequency transformer pressure unit (4), Schottky diode rectification filtering unit (5) and direct current output unit (6); Said control unit is made up of pwm control circuit, detection protective circuit (9), set-point setting operation parts (8) and the display circuit (10) of computer management system control; Pwm control circuit through multi-channel driver circuit (7) respectively with above-mentioned each major loop in FET high-frequency inversion unit (3) be connected; Pwm control circuit also is connected with set-point setting operation parts (8); Described detection protective circuit (9) has multichannel sampled signal input and two paths of signals output, the corresponding direct current output unit (6) that connects in one of above-mentioned a plurality of major loops of every road sampled signal input; The two paths of signals output that detects protective circuit (9) connects pwm control circuit and display circuit (10) respectively; Portable 380V AC power of AC rectification unit (1) separate connection of said each major loop; Direct current output unit (6) in the said a plurality of major loop composition dc output end that is in parallel each other.
2. a kind of 10kV rural power grids distribution line DC de-icing device according to claim 1; It is characterized in that: described two phase endpoints treating ice-thawing electric transmission line are meant the three-phase line reconfiguration of treating ice-melt are become wherein two two-end-points that are in series, or two be in parallel again with the third phase tandem compound after two-end-point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201367438U CN202513531U (en) | 2012-04-02 | 2012-04-02 | Direct current ice-melting device for 10-kilovolt rural power grid distribution lines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201367438U CN202513531U (en) | 2012-04-02 | 2012-04-02 | Direct current ice-melting device for 10-kilovolt rural power grid distribution lines |
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| Publication Number | Publication Date |
|---|---|
| CN202513531U true CN202513531U (en) | 2012-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201367438U Withdrawn - After Issue CN202513531U (en) | 2012-04-02 | 2012-04-02 | Direct current ice-melting device for 10-kilovolt rural power grid distribution lines |
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| Country | Link |
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| CN (1) | CN202513531U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102623941A (en) * | 2012-04-02 | 2012-08-01 | 郴州市东塘电气设备有限公司 | Direct current deicing device for 10KV rural power grid distribution line |
| CN109186776A (en) * | 2018-09-10 | 2019-01-11 | 广州供电局有限公司 | Detection method, device and the detection device of transmission line of electricity wire clamp fever |
| CN110912109A (en) * | 2018-09-14 | 2020-03-24 | 江苏德力化纤有限公司 | Low-voltage direct-current power supply and distribution equipment and method |
-
2012
- 2012-04-02 CN CN2012201367438U patent/CN202513531U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102623941A (en) * | 2012-04-02 | 2012-08-01 | 郴州市东塘电气设备有限公司 | Direct current deicing device for 10KV rural power grid distribution line |
| CN102623941B (en) * | 2012-04-02 | 2014-11-12 | 郴州市东塘电气设备有限公司 | Direct current deicing device for 10KV rural power grid distribution line |
| CN109186776A (en) * | 2018-09-10 | 2019-01-11 | 广州供电局有限公司 | Detection method, device and the detection device of transmission line of electricity wire clamp fever |
| CN110912109A (en) * | 2018-09-14 | 2020-03-24 | 江苏德力化纤有限公司 | Low-voltage direct-current power supply and distribution equipment and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121031 Effective date of abandoning: 20141112 |
|
| RGAV | Abandon patent right to avoid regrant |