CN103236668A - Ice-melting method with voltage reduction, current increase and short circuit by using series connection of two transformers - Google Patents
Ice-melting method with voltage reduction, current increase and short circuit by using series connection of two transformers Download PDFInfo
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- CN103236668A CN103236668A CN 201310051702 CN201310051702A CN103236668A CN 103236668 A CN103236668 A CN 103236668A CN 201310051702 CN201310051702 CN 201310051702 CN 201310051702 A CN201310051702 A CN 201310051702A CN 103236668 A CN103236668 A CN 103236668A
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Abstract
The invention relates to an ice-melting method with voltage reduction, current increase and short circuit by using series connection of two transformers. In the ice-melting method, a high-voltage transformer (2) is electrically connected in series with a high-voltage transformer (3) according to voltage reduction functions of high-voltage transformers, an initial power source (1) is connected to a high-voltage side of the high-voltage transformer (2), and a low-voltage side of the high-voltage transformer (3) is electrically connected with an ice-coated wire (6) through an electric switch (5). According to conditions of the ice-coated wire and parameters of ice-melting equipment, a three-phase short-circuit connection point (7) of the ice-coated wire (6) is selected and an earthing knife-switch (8) is mounted; after the voltage of the initial power source (1) is reduced by the high-voltage transformer (2), the voltage of the initial power source (1) is further reduced by the high-voltage transformer (3) to acquire an ice-melting power source (4) with low voltage and high current intensity; and then the electric switch (5) is switched on, and the ice-melting power source (4) can melt the ice on the ice-coated wire (6).
Description
Technical field
The present invention relates to a kind of dual transformer series connection decompression and flow increasing short circuit ice-melting method, be specifically related to two high-tension transformer connected in electrical series, utilize high-tension transformer that primary power is carried out the secondary step-down, become voltage and reduce the ice-melt power supply that electric current increases, need are carried out the ice coating wire one end three-phase shortcircuit of ice-melt, an other end line passes through the ice-melt power supply of safety, thereby makes the method for circuit heating ice-melt.
Background technology
In recent years, the icing disaster increased frequency that transmission line causes, scale enlarge, harm increases the weight of, and have brought tremendous influence for normal operation and the living standards of the people of electrical network.
For solving the transmission line difficult problem of this serious threat safe operation of power system of icing in the winter time, the powerline ice-covering problem has been carried out big quantity research both at home and abroad, and proposed many transmission line de-icing methods.Under the situation that forms serious icing, the normal method that adopts is mechanical deicing's method and thermal ice-melting method.Mechanical deicing's operation is loaded down with trivial details, and easy damage wires, and China does not still adopt in actual engineering, the general thermal ice-melting method that adopts in the practical application.
The thermal ice-melting method has several modes, mainly comprises load transfer method, direct current ice-melting method.
Load shifts the ice-melt ratio juris and powers on certain bar transmission line for the load on other one or several transmission lines is shifted to focus on, thereby increases the current strength of this transmission line, makes the method for circuit heating ice-melt.The drawback of this kind method is to implement to shift to the load of single power supply, and certain limitation operates.
Direct current ice-melt ratio juris be with ice coating wire as load, apply DC power supply, provide the short circuit current heating wires that icing is melted with low voltage.If adopt system power supply to provide the DC ice melting power supply by rectifying device, the selectable scheme of rectifying device has two kinds: controlled rectification and uncontrollable rectification.Uncontrollable rectifying device price is relatively cheap, but is being provided by system under the situation of rectifier power source, can not realize that zero plays up-flow, can only adopt the method for impacting with high pressure short circuit line that ice melting current is provided, so there is certain impact in system; And the voltage adjustable extent of general transformer is less, and ice coating wire length is restricted when causing adopting this scheme.Adopt the controllable rectifying device scheme can realize that zero boosts and up-flow; By current closed-loop, can be to different length, dissimilar circuits provides same ice melting current, and adaptability is better.But controllable rectifying device structure relative complex; Work time-harmonic wave content is high and reactive loss is big, needs the alternating current filter of configuration one constant volume to carry out reactive power compensation and filtering; And need the protection equipment of configuration response, invest quite big.
This shows that load shifts ice-melting method and the direct current ice-melting method cuts both ways, the present invention introduces a kind of both pluses and minuses of comprehensive consideration, the scheme that combination property is higher.
Summary of the invention
1, the technical problem of Xie Jueing
A kind of dual transformer series connection decompression and flow increasing short circuit ice-melting method involved in the present invention is just at the deficiencies in the prior art, a kind of two high-tension transformer connected in electrical series of utilizing are provided, primary power is carried out the secondary step-down, become the voltage ice-melt power supply that more low current is bigger, the method for ice coating wire being carried out the short circuit ice-melt.
2, technical scheme of the present invention
The invention provides and a kind of two jumbo high-tension transformers are carried out connected in electrical series, after primary power is carried out the secondary step-down, carry out the method for ice-melt for ice coating wire provides the short circuit ice melting current.Its core is: after two high-tension transformers carry out connected in electrical series, primary power is inserted the wherein input of a high-tension transformer, bring out through the output from this transformer after the further step-down of this transformer, the output of this transformer inserts the high voltage input terminal of an other high-tension transformer again, carry out the secondary step-down, through obtaining lower but the ice-melt power supply that electric current is bigger of electric pressure after the secondary step-down, this ice-melt power supply is inputed to ice coating wire ice melting current is provided, prior short circuit between each phase of ice coating wire, ice melting current generates heat through making lead behind the ice coating wire of short circuit, and then reaches the purpose of ice-melt.
De-icing method of the present invention may further comprise the steps:
1) high-tension transformer, ice coating wire after primary power, the series connection are connected and composed electric loop;
2) according to the type of ice-melt equipment such as transformer, ice coating wire, determine the electric parameter of all kinds of ice-melt equipment, calculate ice melting current size and ice coating wire length, the short circuit position of reasonable computation ice coating wire, various electic protection parameters rationally are set, carry out every safety and risk prevention measure;
3) according to the line ice-melting length of calculating, each carries out electric short circuit mutually with ice coating wire in rational position;
4) carry out ice-melt work.
3, beneficial effect
A kind of decompression and flow increasing de-icing method that adopts the present invention to propose has following beneficial effect:
Two transformers through series connection carry out step-down, obtain the bigger ice melting current of low current intensity of voltage, make the ice-melt effect more obvious.
Description of drawings
Fig. 1 is a kind of dual transformer series connection decompression and flow increasing short circuit ice-melting method electrical connection diagram.
As shown in Figure 1,1 is primary power, and 2 is high-tension transformer, and 3 is high-tension transformer, and 4 are the ice-melt power supply after the step-down, and 5 is electric switch, and 6 is ice coating wire, and 7 is the three-phase short circuit point of ice coating wire, and 8 is the ground connection disconnecting link.
Embodiment
As shown in Figure 1, with high-tension transformer (2) and high-tension transformer (3) connected in electrical series, primary power (1) is inserted the high-pressure side of high-tension transformer (2), the low-pressure side of high-tension transformer (3) is electrically connected by electric switch (5) and ice coating wire (6).Parameters according to wire icing situation and ice-melt equipment, selection ice coating wire (6) short circuit line length that is to say the three-phase short circuit point (7) from electric switch (5) to ice coating wire (6), and ground connection disconnecting link (8) is installed, avoid ice melting current to influence the power consumption equipment safety of tail end line.
Its operation principle is: after initial power supply (1) is through high-tension transformer (2) step-down, by high-tension transformer (3) further step-down again, obtain lower but the ice-melt power supply (4) that current strength is bigger of voltage, the electric switch (5) that closes, ice-melt power supply (4) just can be to carrying out ice-melt to ice coating wire (6).
Claims (1)
1. dual transformer series connection decompression and flow increasing short circuit ice-melting method, comprise the high-tension transformer of two connected in electrical series and the icing circuit of an end three-phase short circuit are electrically connected, it is characterized in that: with two high-tension transformer connected in electrical series, the high voltage input terminal of first high-tension transformer is connected with primary power, the low-voltage output of second high-tension transformer and icing circuit are electrically connected, utilize two high-tension transformers that primary power is carried out twice step-down, become voltage and reduce the method that ice-melt power supply that electric current increases makes icing circuit heating ice-melt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310051702 CN103236668A (en) | 2013-02-03 | 2013-02-03 | Ice-melting method with voltage reduction, current increase and short circuit by using series connection of two transformers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310051702 CN103236668A (en) | 2013-02-03 | 2013-02-03 | Ice-melting method with voltage reduction, current increase and short circuit by using series connection of two transformers |
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| Publication Number | Publication Date |
|---|---|
| CN103236668A true CN103236668A (en) | 2013-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201310051702 Pending CN103236668A (en) | 2013-02-03 | 2013-02-03 | Ice-melting method with voltage reduction, current increase and short circuit by using series connection of two transformers |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786299A (en) * | 2016-11-16 | 2017-05-31 | 国网四川省电力公司电力科学研究院 | The circuit connected using dual transformer exchanges de-icing method |
| CN107516846A (en) * | 2017-08-30 | 2017-12-26 | 国网湖南省电力公司 | New de-icing method for agriculture distribution |
-
2013
- 2013-02-03 CN CN 201310051702 patent/CN103236668A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786299A (en) * | 2016-11-16 | 2017-05-31 | 国网四川省电力公司电力科学研究院 | The circuit connected using dual transformer exchanges de-icing method |
| CN106786299B (en) * | 2016-11-16 | 2019-01-18 | 国网四川省电力公司电力科学研究院 | De-icing method is exchanged using the concatenated route of dual transformer |
| CN107516846A (en) * | 2017-08-30 | 2017-12-26 | 国网湖南省电力公司 | New de-icing method for agriculture distribution |
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Application publication date: 20130807 |